OrganismsChemicals and DrugsAnalytical, Diagnostic and Therapeutic Techniques and EquipmentPhenomena and ProcessesAnthropology, Education, Sociology and Social PhenomenaHealth Care
Oxygen IsotopesEvolution, PlanetaryMeteoroidsOxygenCedrelaEl Nino-Southern OscillationSolar SystemIsotopesMinor PlanetsLarixIsotope LabelingCarbon IsotopesAtmosphereFossilsClimateNitrogen IsotopesTimeGeologic SedimentsOxygen ConsumptionReactive Oxygen SpeciesWaterEcosystemTemperatureZinc IsotopesSulfur Isotopes
Oxygen Isotopes
Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes.
Evolution, Planetary
Creation and development of bodies within solar systems, includes study of early planetary geology.
Meteoroids
Any solid objects moving in interplanetary space that are smaller than a planet or asteroid but larger than a molecule. Meteorites are any meteoroid that has fallen to a planetary surface. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Oxygen
An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.
Cedrela
A plant genus of the family MELIACEAE. Members contain cedrelanolide.
El Nino-Southern Oscillation
El Nino-Southern Oscillation or ENSO is a cycle of extreme alternating warm El Niño and cold La Nina events which is the dominant year-to-year climate pattern on Earth. Both terms refer to large-scale changes in sea-surface temperature across the eastern tropical Pacific. ENSO is associated with a heightened risk of certain vector-borne diseases. (From http://www.elnino.noaa.gov/lanina_new_faq.html, accessed 5/12/2020)
Solar System
The group of celestial bodies, including the EARTH, orbiting around and gravitationally bound by the sun. It includes eight planets, one minor planet, and 34 natural satellites, more than 1,000 observed comets, and thousands of lesser bodies known as MINOR PLANETS (asteroids) and METEOROIDS. (From Academic American Encyclopedia, 1983)
Isotopes
Atomic species differing in mass number but having the same atomic number. (Grant & Hackh's Chemical Dictionary, 5th ed)
Minor Planets
Small solar system planetary bodies including asteroids. Most asteroids are found within the gap lying between the orbits of Mars and Jupiter.
Larix
A plant genus in the family PINACEAE, order Pinales, class Pinopsida, division Coniferophyta.
Isotope Labeling
Techniques for labeling a substance with a stable or radioactive isotope. It is not used for articles involving labeled substances unless the methods of labeling are substantively discussed. Tracers that may be labeled include chemical substances, cells, or microorganisms.
Carbon Isotopes
Stable carbon atoms that have the same atomic number as the element carbon, but differ in atomic weight. C-13 is a stable carbon isotope.
Atmosphere
The gaseous envelope surrounding a planet or similar body. (From Random House Unabridged Dictionary, 2d ed)
Fossils
Remains, impressions, or traces of animals or plants of past geological times which have been preserved in the earth's crust.
Climate
The longterm manifestations of WEATHER. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Nitrogen Isotopes
Stable nitrogen atoms that have the same atomic number as the element nitrogen, but differ in atomic weight. N-15 is a stable nitrogen isotope.
Time
The dimension of the physical universe which, at a given place, orders the sequence of events. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Geologic Sediments
A mass of organic or inorganic solid fragmented material, or the solid fragment itself, that comes from the weathering of rock and is carried by, suspended in, or dropped by air, water, or ice. It refers also to a mass that is accumulated by any other natural agent and that forms in layers on the earth's surface, such as sand, gravel, silt, mud, fill, or loess. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed, p1689)
Oxygen Consumption
The rate at which oxygen is used by a tissue; microliters of oxygen STPD used per milligram of tissue per hour; the rate at which oxygen enters the blood from alveolar gas, equal in the steady state to the consumption of oxygen by tissue metabolism throughout the body. (Stedman, 25th ed, p346)
Reactive Oxygen Species
Molecules or ions formed by the incomplete one-electron reduction of oxygen. These reactive oxygen intermediates include SINGLET OXYGEN; SUPEROXIDES; PEROXIDES; HYDROXYL RADICAL; and HYPOCHLOROUS ACID. They contribute to the microbicidal activity of PHAGOCYTES, regulation of signal transduction and gene expression, and the oxidative damage to NUCLEIC ACIDS; PROTEINS; and LIPIDS.
Water
A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Ecosystem
A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed)
Temperature
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
Zinc Isotopes
Stable zinc atoms that have the same atomic number as the element zinc, but differ in atomic weight. Zn-66-68, and 70 are stable zinc isotopes.
Sulfur Isotopes
Stable sulfur atoms that have the same atomic number as the element sulfur, but differ in atomic weight. S-33, 34, and 36 are stable sulfur isotopes.

A functional model for O-O bond formation by the O2-evolving complex in photosystem II. (1/649)

The formation of molecular oxygen from water in photosynthesis is catalyzed by photosystem II at an active site containing four manganese ions that are arranged in di-mu-oxo dimanganese units (where mu is a bridging mode). The complex [H2O(terpy)Mn(O)2Mn(terpy)OH2](NO3)3 (terpy is 2,2':6', 2"-terpyridine), which was synthesized and structurally characterized, contains a di-mu-oxo manganese dimer and catalyzes the conversion of sodium hypochlorite to molecular oxygen. Oxygen-18 isotope labeling showed that water is the source of the oxygen atoms in the molecular oxygen evolved, and so this system is a functional model for photosynthetic water oxidation.  (+info)

Towards the reaction mechanism of pyrogallol-phloroglucinol transhydroxylase of Pelobacter acidigallici. (2/649)

Conversion of pyrogallol to phloroglucinol was studied with the molybdenum enzyme transhydroxylase of the strictly anaerobic fermenting bacterium Pelobacter acidigallici. Transhydroxylation experiments in H218O revealed that none of the hydroxyl groups of phloroglucinol was derived from water, confirming the concept that this enzyme transfers a hydroxyl group from the cosubstrate 1,2,3, 5-tetrahydroxybenzene (tetrahydroxybenzene) to the acceptor pyrogallol, and simultaneously regenerates the cosubstrate. This concept requires a reaction which synthesizes the cofactor de novo to maintain a sufficiently high intracellular pool during growth. Some sulfoxides and aromatic N-oxides were found to act as hydroxyl donors to convert pyrogallol to tetrahydroxybenzene. Again, water was not the source of the added hydroxyl groups; the oxides reacted as cosubstrates in a transhydroxylation reaction rather than as true oxidants in a net hydroxylation reaction. No oxidizing agent was found that supported a formation of tetrahydroxybenzene via a net hydroxylation of pyrogallol. However, conversion of pyrogallol to phloroglucinol in the absence of tetrahydroxybenzene was achieved if little pyrogallol and a high amount of enzyme preparation was used which had been pre-exposed to air. Obviously, the enzyme was oxidized by air to form sufficient amounts of tetrahydroxybenzene from pyrogallol to start the reaction. A reaction mechanism is proposed which combines an oxidative hydroxylation with a reductive dehydroxylation via the molybdenum cofactor, and allows the transfer of a hydroxyl group between tetrahydroxybenzene and pyrogallol without involvement of water. With this, the transhydroxylase differs basically from all other hydroxylating molybdenum enzymes which all use water as hydroxyl source.  (+info)

Metabolism of (R)-(+)-pulegone and (R)-(+)-menthofuran by human liver cytochrome P-450s: evidence for formation of a furan epoxide. (3/649)

(R)-(+)-Pulegone, a monoterpene constituent of pennyroyal oil, is a hepatotoxin that has been used in folklore medicine as an abortifacient despite its potential lethal effects. Pulegone is metabolized by human liver cytochrome P-450s to menthofuran, a proximate hepatotoxic metabolite of pulegone. Expressed human liver cytochrome (CYP) P-450s (1A2, 2A6, 2C9, 2C19, 2D6, 2E1, and 3A4) were tested for their ability to catalyze the oxidations of pulegone and menthofuran. Expressed CYP2E1, CYP1A2, and CYP2C19 oxidized pulegone to menthofuran, with respective Km and Vmax values of 29 microM and 8.4 nmol/min/nmol P-450 for CYP2E1, 94 microM and 2.4 nmol/min/nmol P-450 for CYP1A2, and 31 microM and 1.5 nmol/min/nmol P-450 for CYP2C19. The human liver P-450s involved in the metabolism of menthofuran are the same as pulegone except for the addition of CYP2A6. These P-450s were found to oxidize menthofuran to a newly identified metabolite, 2-hydroxymenthofuran, which is an intermediate in the formation of the known metabolites mintlactone and isomintlactone. Based on studies with 18O2 and H218O, 2-hydroxymenthofuran arises predominantly from a dihydrodiol formed from a furan epoxide. CYP2E1, CYP1A2, and CYP2C19 oxidized menthofuran with respective Km and Vmax values of 33 microM and 0.43 nmol/min/nmol P-450 for CYP2E1, 57 microM and 0.29 nmol/min/nmol P-450 for CYP1A2, and 62 microM and 0.26 nmol/min/nmol P-450 for CYP2C19.  (+info)

Origin of graphitic carbon and pentlandite in matrix olivines in the Allende meteorite. (4/649)

Matrix olivines in the Allende carbonaceous chondrite are believed to have formed by condensation processes in the primitive solar nebula. However, transmission electron microscope observations of numerous matrix olivines show that they contain abundant, previously unrecognized, nanometer-sized inclusions of pentlandite and poorly graphitized carbon. Neither of these phases would have been stable at the high-temperature conditions required to condense iron-rich olivine in the solar nebula. The presence of these inclusions is consistent with formation of the olivines by parent body processes that involved overgrowth of fine-grained organic materials and sulfides in the precursor matrix materials.  (+info)

Butanol is superior to water for performing positron emission tomography activation studies. (5/649)

[15(O)]Butanol has been shown to be superior to [15(O)]water for measuring cerebral blood flow with positron emission tomography. This work demonstrates that it is also superior for performing activation studies. Data were collected under three conditions: a visual confrontation animal-naming task, nonsense figure size discrimination, and a nonvisual darkroom control task. Time-activity curves (TAC) were obtained for regions known to be activated by the confrontation naming task to compare absolute uptake and the different kinetics of the two tracers. Also, t statistic maps were calculated from the data of 10 subjects for both tracers and compared for magnitude of change and size of activated regions. Peak uptake in the whole-brain TAC were similar for the two tracers. For all regions and conditions, the washout rate of [15(O)]butanol was 41% greater than that of [15(O)]water. At a threshold of 0, the [15(O)]water and [15(O)]butanol percent difference (nonnormalized) and t statistic (global normalization) images are nearly identical, indicating that the same property is being measured with both tracers. The [15(O)]butanol parametric images displayed at a threshold of /t/ = 5 look similar to the [15(O)]water parametric maps displayed at a threshold of /t/ = 4, which is consistent with the observation that t statistic values in [15(O)]butanol images are generally greater. The t statistic values were equal when the [15(O)]butanol parametric map was created from any subset of 6 subjects and the [15(O)]water parametric map was created from all 10 subjects. Fewer subjects need to be studied with [15(O)]butanol to reach the same statistical power as an [15(O)]water-based study.  (+info)

Isotope dilution spaces of mice injected simultaneously with deuterium, tritium and oxygen-18. (6/649)

The isotope dilution technique for measuring total body water (TBW), and the doubly labelled water (DLW) method for measuring energy expenditure, are both sensitive to small variations in the ratio of the hydrogen to oxygen-18 dilution space. Since the dilution space ratio varies between individuals, there has been much recent debate over what causes this variability (i.e. physiological differences between individuals or analytical error in the isotope determinations), and thus which values (individual or a population mean dilution space ratio) should be employed for TBW and DLW calculations. To distinguish between physiological and analytical variability, we injected 15 non-reproductive and 12 lactating mice (Mus musculus, outbred MF1) simultaneously with deuterium, tritium and oxygen-18. The two hydrogen labels were administered and analysed independently, therefore we expected a strong correlation between dilution space ratios based on deuterium and tritium if most of the variation in dilution spaces was physiological, but only a weak correlation if most of the variation was analytical. Dilution spaces were significantly influenced by reproductive status. Dilution spaces expressed as a percentage of body mass averaged 15.7 % greater in lactating mice than in non-reproductive mice. In addition, the hydrogen tracer employed had a significant effect (deuterium spaces were 2.0 % larger than tritium spaces). Deuterium and tritium dilution spaces, expressed as a percentage of body mass, were highly correlated. Dilution space ratios ranged from 0.952 to 1. 146 when using deuterium, and from 0.930 to 1.103 when using tritium. Dilution space ratios based on deuterium and tritium were also highly correlated. Comparison of standard deviations of the dilution space ratio based on deuterium in vivo and in vitro indicated that only 4.5 % of the variation in the dilution space ratios observed in the mice could be accounted for by analytical variation in the deuterium and oxygen-18 analyses. Although our results include data which were outside the limits previously regarded as biologically possible, the correlations that we detected strongly suggest that variation in the observed dilution space ratio was mostly physiological rather than analytical.  (+info)

Mechanistic studies of phosphoserine phosphatase, an enzyme related to P-type ATPases. (7/649)

Phosphoserine phosphatase belongs to a new class of phosphotransferases forming an acylphosphate during catalysis and sharing three motifs with P-type ATPases and haloacid dehalogenases. The phosphorylated residue was identified as the first aspartate in the first motif (DXDXT) by mass spectrometry analysis of peptides derived from the phosphorylated enzyme treated with NaBH(4) or alkaline [(18)O]H(2)O. Incubation of native phosphoserine phosphatase with phosphoserine in [(18)O]H(2)O did not result in (18)O incorporation in residue Asp-20, indicating that the phosphoaspartate is hydrolyzed, as in P-type ATPases, by attack of the phosphorus atom. Mutagenesis studies bearing on conserved residues indicated that four conservative changes either did not affect (S109T) or caused a moderate decrease in activity (G178A, D179E, and D183E). Other mutations inactivated the enzyme by >80% (S109A and G180A) or even by >/=99% (D179N, D183N, K158A, and K158R). Mutations G178A and D179N decreased the affinity for phosphoserine, suggesting that these residues participate in the binding of the substrate. Mutations of Asp-179 decreased the affinity for Mg(2+), indicating that this residue interacts with the cation. Thus, investigated residues appear to play an important role in the reaction mechanism of phosphoserine phosphatase, as is known for equivalent residues in P-type ATPases and haloacid dehalogenases.  (+info)

Protein-water interaction studied by solvent 1H, 2H, and 17O magnetic relaxation. (8/649)

Previous studies of the magnetic field dependence of the magnetic relaxation rate of solvent protons in protein solutions have indicated that this dependence (called relaxation dispersion) is related to the rotational Brownian motion of the solute proteins. In particular, the dispersion of the longitudinal (spin-lattice) relaxation rate 1/T1 shows a monotonic decrease with increasing field, with an inflection point corresponding to a proton Larmor frequency which is inversely proportional to the orientational relaxation time of the protein. We have now compared the relaxation dispersion of solvent 1H, 2H, and 17O In aqueous solutions of lysozyme (molecular weight 14,700) and 1H and 2H in solutions of hemocyanin (molecular weight 14,7 00) and 1H and 2H in solutions of hemocyanin (molecular weight 9 x 10(6)). The main experimental observation is that the dispersion of the relaxation rates of the three solvent nuclei in lysozyme solutions, normalized to their respective rates in pure water, is essentially the same. This is also true for 1H and 2H relaxation in hemocyanin solutions. These results confirm that entire solvent water molecules, rather than exchanging protons, are involved in the interaction. We have been unable to deduce the correct mechanism to explain the data, but we can eliminate several interaction mechanisms from consideration. For example, all observations combined cannot be explained by a simple two-site model of exchange, in which water molecules are either in sites on the protein with a relaxation rate characteristic of these sites, or else in the bulk solvent (the observed relaxation rate being the weighted average of the two). Also eliminated is the class of models in which the protein molecules induce a preferential partial alignment of neighboring solvent molecules, for example by electrostatic interaction of the electric dipole moments of the water with the electric fields produced by surface charges of the protein molecules. In addition, the idea that relaxation of solvent nuclei is due, in the main, to interactions with protein protons is precluded. Rather, it appears that the protein molecules influence the dynamics of the motion of solvent water molecules in their neighborhood in a manner that imposes on all the solvent molecules a correlation time for their orientational relaxation which equals that of the solute proteins.  (+info)

Positional isotope exchange analysis of the Mycobacterium smegmatis cysteine ligase (MshC)<...Positional isotope exchange analysis of the Mycobacterium smegmatis cysteine ligase (MshC)<...
TY - JOUR. T1 - Positional isotope exchange analysis of the Mycobacterium smegmatis cysteine ligase (MshC). AU - Williams, La Kenya. AU - Fan, Fan. AU - Blanchard, John S.. AU - Raushel, Frank M.. PY - 2008/4/22. Y1 - 2008/4/22. N2 - MshC catalyzes the ATP-dependent condensation of GlcN-Ins and cysteine to form Cys-GlcN-Ins, which is an intermediate in the biosynthetic pathway of mycothiol, i.e., 1-D-myo-inosityl-2-(N-acetyl-L-cysteinyl)amido-2-deoxy-α- D-glucopyranoside (MSH or AcCys-GlcN-Ins). MSH is produced by Mycobacterium tuberculosis, members of the Actinomycetes family, to maintain an intracellular reducing environment and protect against oxidative and antibiotic induced stress. The biosynthesis of MSH is essential for cell growth, and therefore, the MSH biosynthetic enzymes present potential targets for inhibitor design. The formation of kinetically competent adenylated intermediates was suggested by the observation of positional isotope exchange (PIX) reaction using [βγ-18O6]-ATP in ...
https://einstein.pure.elsevier.com/en/publications/positional-isotope-exchange-analysis-of-the-mycobacterium-smegmat-2
Appendix E) Stable carbon and oxygen isotope composition of Globigerinoides sacculifera of ODP Hole 121-758BAppendix E) Stable carbon and oxygen isotope composition of Globigerinoides sacculifera of ODP Hole 121-758B
PANGAEA - Publishing Network for Geoscientific and Environmental Data. (Appendix E) Stable carbon and oxygen isotope composition of Globigerinoides sacculifera of ODP Hole 121-758B. Occurrence Dataset https://doi.org/10.1594/pangaea.759093 accessed via GBIF.org on 2017-12-15 ...
https://www.gbif.org/dataset/820ebc70-f762-11e1-a439-00145eb45e9a
Oxygen isotope and trace element zoning in hydrothermal garnets: Windows into large-scale fluid-flow behavior | Geology |...Oxygen isotope and trace element zoning in hydrothermal garnets: Windows into large-scale fluid-flow behavior | Geology |...
Single garnet crystals from a large, multicyclic hydrothermal system in Far East Russia are strongly growth zoned. Microscale ion microprobe analysis reveals consistent intracrystalline patterns in oxygen isotope composition and boron and iron contents, reflecting evolution of the hydrothermal system from magmatic- to meteoric-dominated conditions, and repetitive influx of magmatic fluids. Large intracrystalline variations in oxygen isotope composition (,12‰ δ18O) delimit temporal evolution of magmatic and meteoric fluid input within different portions of the hydrothermal system, and suggest that fluid-flow regimes differed between central and distal portions of the system. These results provide compelling evidence that microanalytical data can be extrapolated from intracrystalline scales to study macroscale processes in complex, large-scale fluid-rock systems. ...
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/29/6/479/192036/oxygen-isotope-and-trace-element-zoning-in?redirectedFrom=fulltext
Oxygen isotope evidence for the late Cenozoic development of an orographic rain shadow in eastern Washington, USA | Geology |...Oxygen isotope evidence for the late Cenozoic development of an orographic rain shadow in eastern Washington, USA | Geology |...
Topographic development of the southern Washington Cascade Range and its influence on regional climate on the leeward side of the range for the past 15.6 m.y. are evaluated, using oxygen isotope ratios (δ18O) of ancient meteoric water recorded in authigenic smectites. The δ18O values of authigenic smectites from paleosols and altered tuffs on the east side of the range exhibit a temporal and continuous decrease of ∼3‰-4‰ from 15.6 Ma to the present. Taking into account a regional temperature change in eastern Washington since the middle Miocene, the calculated δ18O values of regional meteoric water show a negative shift of ∼3.5‰-4.5‰ over the same interval. Such a decrease is similar to the change in the δ18O values of modern precipitation from the coastal side to a region downwind of the Washington Cascades. This negative shift of the calculated δ18O values on the east side of the range is best explained by the development of a rain shadow due to the tectonic rock uplift of the ...
https://pubs.geoscienceworld.org/gsa/geology/article-abstract/33/4/313/29586/oxygen-isotope-evidence-for-the-late-cenozoic?redirectedFrom=fulltext
Paleoclimates, ocean depth, and the oxygen isotopic composition of seawater - ResearchOnline@JCUPaleoclimates, ocean depth, and the oxygen isotopic composition of seawater - [email protected]
A recurrent interpretation of ancient climate based on the oxygen isotopic composition of marine carbonates and cherts suggests that Earths climate was substantially warmer in the distant past and remained so until as recently as 400 Myr ago. This interpretation is difficult to reconcile with the long-term glacial record, with evidence for modest weathering rates during most of Earths history, with biomarker and fossil evidence for eukaryotes and even vertebrates at times of anomalously low δ18O values, and with the predicted faintness of the young Sun. We argue here, following earlier suggestions, that the low δ18O values in ancient rocks are a consequence of the low δ18O of ancient seawater. A modest increase in ocean depth with time, together with progressive increases in pelagic sedimentation on midocean ridge flanks since about 550 Ma, could account for the variation in seawater isotopic composition. The required change in ocean depth, coupled with thinning of the oceanic crust, is a ...
https://researchonline.jcu.edu.au/3892/
Measurements of infiltration rates in urban sewer systems: use of oxygen isotopes
Abstract The paper presents the principle of a method to measure infiltration rates in sewer systems based on the use of oxygen isotopes and its application in Lyon (France). Investigations in the urban area of Lyon benefit from the isotopic differences between underground waters originating from the two rivers Rhône and Saône and from their associated alluvial aquifers. The oxygen isotopic composition of the Rhône water is roughly 3 ‰ lighter than that of the Saône river, due to the large differences in the mean altitude and topographic situation of their catchments. Large amounts of water are pumped from the Rhône aquifer for drinking water supply. As a consequence, this difference in the oxygen isotopic composition between wastewater and local groundwater can be used to evaluate infiltration in sewers in some parts of the city. The results obtained in a case study allow to evaluate the reliability and the uncertainties of this method. ...
http://www.eugris.info/displayresource.aspx?r=5067&Cat=document
Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose :: University of Southern...
This dissertation investigates hydrological variability within tropical Asia over the past several few centuries as reflected in the stable oxygen isotope composition of atmospheric moisture. The stable isotopes of water in the climate system are unique tracers of moisture transport and tropical rainfall variability. The isotopic signal of atmospheric moisture within the tropics is transferred to cellulose of tropical trees during photosynthesis. Thus, the isotopic composition of tree cellulose can provide an archive of past hydrologic variability through isotopic reconstructions of the cellulose extracted from annual rings of long lived trees. The tropical atmospheric variability reflected in tropical trees can include variations in the Indian Monsoon and changes in moisture availability over Asia in response to the El Niño-Southern Oscillation (ENSO). Here an attempt has been made to better understand how the atmospheric dynamics associated within these climate phenomena influence the ...
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/65436/rec/511
Recent variability in the hyrdological cycle of tropical Asia from oxygen isotopes of tree celulose :: University of Southern...
This dissertation investigates hydrological variability within tropical Asia over the past several few centuries as reflected in the stable oxygen isotope composition of atmospheric moisture. The stable isotopes of water in the climate system are unique tracers of moisture transport and tropical rainfall variability. The isotopic signal of atmospheric moisture within the tropics is transferred to cellulose of tropical trees during photosynthesis. Thus, the isotopic composition of tree cellulose can provide an archive of past hydrologic variability through isotopic reconstructions of the cellulose extracted from annual rings of long lived trees. The tropical atmospheric variability reflected in tropical trees can include variations in the Indian Monsoon and changes in moisture availability over Asia in response to the El Niño-Southern Oscillation (ENSO). Here an attempt has been made to better understand how the atmospheric dynamics associated within these climate phenomena influence the ...
http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll3/id/65436/rec/5
Oxygen Isotope PlotsOxygen Isotope Plots
Oxygen isotope composition of main-group pallasites and mesosiderites. Data for main-group pallasites and mesosiderites from Greenwood et al. (2006). Solid lines through data points show the mean Δ17O value for each group. Grey-shaded boxes depict the 2σ error on the mesosiderite and main-group pallasite population Δ17O and δ18O mean values. Open squares are individual mesosiderite analyses, open circles individual pallasite analyses. The dashed line labelled (1) is the eucrite fractionation line of Greenwood et al. (2005); the dashed line labelled (2) shows the range of HED values obtained by Weichert et al. (2004). Δ17O is linearized using the format of Miller (2002): Δ17O = 1000 ln (1+ (δ17O/1000)) - λ1000 ln (1+ ( δ18O/1000)) where λ = 0.5247. TFL = Terrestrial Fractionation Line ...
https://www.lpi.usra.edu/meteor/drawplot.php?x=-2.6420&y=-6.2500&z=-4.8780&plot=7&label=Karavannoe%20
Oxygen Isotope PlotsOxygen Isotope Plots
Oxygen isotope composition of Martian meteorites. Data for Martian meteorites from Franchi et al. (1999) and compiled from laser fluorination analyses in the Meteoritical Bulletin. MFL: Martian fractionation line of Franchi et al. (1999), TFL: terrestrial fractionation line.Δ17O calculated as: Δ17O = δ17O - 0.52δ18O ...
https://www.lpi.usra.edu/meteor/drawplot.php?x=4.728
AGDC Releases WAIS Divide WDC06A Oxygen Isotope Record Data | The DriftAGDC Releases WAIS Divide WDC06A Oxygen Isotope Record Data | The Drift
The Antarctic Glaciological Data Center (AGDC) at NSIDC is pleased to announce the release of a new data set, the WAIS Divide WDC06A Oxygen Isotope Record. This data set contains complete low resolution (0.25 to 100 cm) oxygen isotope data from the WAIS Divide Ice Core WDC06A, 0 to 3404.7 m depth. Also included is the WDC2014 timescale.. ...
http://nsidc.org/the-drift/data-update/agdc-releases-wais-divide-wdc06a-oxygen-isotope-record-data/
Oxygen isotope ratios in fossil wood cellulose: Isotopic composition of Eocene- to Miocene-aged fossil wood cellulose | Earth &...
We measured the δ18O of cellulose (δ18Ocel) extracted from fossil wood collected at 9 sites in the northern and southern hemispheres as a potential source of information about precipitation δ18O (δ18Oppt) in the past and paleotemperatures. The samples had been buried in fluvial sediments for periods of time ranging from ca. 45 million to 250 years. At the oldest localities (high latitude, Eocene- through Pliocene-age sites in Canada and Russia), mean annual temperature (MAT) estimates derived from the modern relationship between MAT and δ18Ocel are 6-16°C lower than the MAT estimates derived from other biological proxies. Estimates of Pleistocene and Holocene mean annual temperatures are close to the modern values at those sites. These results are consistent with other recent findings that the MAT/δ18Oppt relationship across North America was not constant throughout the Cenozoic. Paleo-δ18Oppt estimates derived from fossil cellulose and the modern North American relationship between ...
http://www.sas.upenn.edu/earth/content/oxygen-isotope-ratios-fossil-wood-cellulose-isotopic-composition-eocene-miocene-aged-fossil
Professor Margaret Barbour - The University of SydneyProfessor Margaret Barbour - The University of Sydney
Margaret Barbour holds a BSc in Biology and Earth Sciences and an MSc in Biology from the University of Waikato, New Zealand, and a PhD in Plant Science from the Australian National University. During her PhD she developed new understanding, and mechanistic models, of variability in the oxygen isotope composition of plant tissue. Her work was the first to theoretically describe and demonstrate the record of leaf evaporative environment present in the oxygen isotope composition of plant material. This work has subsequently been applied to reconstruct past climates from tree ring stable isotopes, as an indicator of plant regulation of water loss, and as a selection tool for yield in grain crops. Margaret was employed by Landcare Research in New Zealand from 2001 to 2009, where she led a Foundation-funded objective investigating the exchange of carbon dioxide in terrestrial systems at site scales, and the sensitivities and uncertainties of these processes to variation in climate, environmental and ...
http://sydney.edu.au/science/people/margaret.barbour.php
Vein growth mechanisms and fluid sources revealed by oxygen isotope laser microprobe<...Vein growth mechanisms and fluid sources revealed by oxygen isotope laser microprobe<...
TY - JOUR. T1 - Vein growth mechanisms and fluid sources revealed by oxygen isotope laser microprobe. AU - Kirschner, D. L.. AU - Sharp, Z. D.. AU - Teyssier, Christian. PY - 1993/1/1. Y1 - 1993/1/1. N2 - In situ, laser microprobe analyses of millimetre-wide quartz veins has revealed the largest δ 18 O gradients (9‰/mm) yet documented in terrestrial samples. The systematic isotopic variations indicate a crack-seal growth mechanism that variably interleaved 18 O-enriched quartzite porphyroclasts with newly precipitated, 18 O-depleted vein quartz. The isotopically light quartz requires open-system infiltration of meteoric fluids into the quartzite during its incorporation into the Ruby Gap duplex (central Australia). Documentation of the fluid source in these small veins would not be possible without submillimetre isotopic sampling capabilities. Application of this laser-based technology to other geological problems should result in similar documentation of large isotopic gradients and provide ...
https://experts.umn.edu/en/publications/vein-growth-mechanisms-and-fluid-sources-revealed-by-oxygen-isoto
Spatial variations in gas and stable isotope compositions of thermal fluids around Lake Van: Implications for crust-mantle...Spatial variations in gas and stable isotope compositions of thermal fluids around Lake Van: Implications for crust-mantle...
We investigate the helium (He-3/He-4) and carbon (delta C-13) isotope compositions and relative abundance ratios (CO2/He-3) of gas samples together with the stable isotope compositions of dissolved carbon and sulfur and the oxygen and hydrogen isotopic compositions of the associated water phase from a number of geothermal fields located around Lake Van in eastern Anatolia, Turkey. The mantle-derived helium component, which is likely transferred to the crust beneath eastern Turkey by recent magmatism, is found to constitute up to 96% (e.g. Nemrut Caldera) of the total He content in fluids. As regards the spatial distribution of He, samples collected from areas of Pliocene-Quaternary volcanics are characterized by a wide and generally higher range of R/R-A ratios (0.93 to 7.76 R-A) compared to those of non-volcanic regions ((1.85 to 1.0 R-A). CO2/He-3 ratios vary over a wide range (2.4 x 10(5)-3.8 x 10(13)) but are mostly higher than that of the nominal upper mantle (similar to 2 x 10(9)). ...
https://avesis.yyu.edu.tr/yayin/2193bcae-7ed8-42e5-b79e-d40978917e59/spatial-variations-in-gas-and-stable-isotope-compositions-of-thermal-fluids-around-lake-van-implications-for-crust-mantle-dynamics-in-eastern-turkey
Energies | Free Full-Text | Gas Hydrate Occurrence Inferred from Dissolved Cl− Concentrations and δ18O Values of Pore Water...Energies | Free Full-Text | Gas Hydrate Occurrence Inferred from Dissolved Cl− Concentrations and δ18O Values of Pore Water...
Deep-water pockmarks are frequently accompanied by the occurrence of massive gas hydrates in shallow sediments. A decline in pore-water Cl− concentration and rise in δ18O value provide compelling evidence for the gas hydrate dissociation. Mega-pockmarks are widely scattered in the southwestern Xisha Uplift, northern South China Sea (SCS). Pore water collected from a gravity-core inside of a mega-pockmark exhibits a downward Cl− concentration decrease concomitant with an increase in δ18O value at the interval of 5.7-6.7 mbsf. Concentrations of Cl−, Na+, and K+ mainly cluster along the seawater freshening line without distinct Na+ enrichment and K+ depletion. Thus, we infer that the pore water anomalies of Cl− concentrations and δ18O values are attributed to gas hydrate dissociation instead of clay mineral dehydration. Moreover, the lower δ18O values of sulfate in the target core (C14) than those in the reference core (C9) may be associated with the equilibrium oxygen fractionation during
http://www.mdpi.com/1996-1073/7/6/3886/htm
The proportion of remineralized nitrate on the ice-covered eastern Bering Sea shelf evidenced from the oxygen isotope ratio of...The proportion of remineralized nitrate on the ice-covered eastern Bering Sea shelf evidenced from the oxygen isotope ratio of...
Granger, J., M. G. Prokopenko, D. M. Sigman, C. W. Mordy, Z. M. Morse, L. V. Morales, R. N. Sambrotto, and B. Plessen (2011), Coupled nitrification-denitrification in sediment of the eastern Bering Sea shelf leads to (15)N enrichment of fixed N in shelf waters, J. Geophys. Res., 116, C11006, doi:10.1029/2010JC006751 ...
http://onlinelibrary.wiley.com/doi/10.1002/gbc.20075/references?globalMessage=0
Sorption of Aqueous Fe(ii) on Goethite Investigated with Stable Oxygen Isotopes - Semantic ScholarSorption of Aqueous Fe(ii) on Goethite Investigated with Stable Oxygen Isotopes - Semantic Scholar
This thesis work is aimed at examining the oxygen atom mixing between common iron(III) oxides and Fe(II)aq solution during the sorption process. First, O labeled iron(III) minerals were used in batch sorption reactors to study the exchange of oxygen atom within the Fe(II)aq - iron(III) oxide system. Results showed a much lesser extent of oxygen mixing than reported Fe mixing from previous studies, even when dissolved Fe(II) is present. The oxygen mixing extents are 3.95 % more for goethite and 9.66 % more for ferrihydrite than their respective controls within 14 days. A consecutive atom exchange kinetic study indicated that O exchange is not inhibited by surface Fe sorptive site saturation, and that after 40d sorption experiment, the maximum O exchange is 54.96 % across reactors with different initial solid loadings and Fe(II)aq levels. The second part of this work examined the influence of aqueous Fe(II) on the sorption of selenium oxyanions (selenite and selenate) in Fe(II)aq - iron(III) systems. It
https://www.semanticscholar.org/paper/Sorption-of-Aqueous-Fe-ii-on-Goethite-Investigated-/bb9e735a69d3a03e5cb90a2848c6834724a7ee07
Carbon & Oxygen Isotopes - Time ScavengersCarbon & Oxygen Isotopes - Time Scavengers
On the previous Isotope page, you learned a bit about what isotopes are, how they are obtained, and how the isotopes of certain elements are measured. Here, well elaborate on how to read carbon and oxygen isotope data and how the values are often interpreted by paleoclimatologists. Reading Isotope Data Measurements of carbon and oxygen…
https://timescavengers.blog/introductory-material/what-is-paleoclimatology/proxy-data/carbon-oxygen-isotopes/
Oxygen isotope fractionation during calcification in Calcidiscus leptoporus: The influence of carbonate chemistry - ePICOxygen isotope fractionation during calcification in Calcidiscus leptoporus: The influence of carbonate chemistry - ePIC
Langer, G. , Ziveri, P. , Geisen, M. and Thoms, S. (2008): Oxygen isotope fractionation during calcification in Calcidiscus leptoporus: The influence of carbonate chemistry , European Geosciences Union, General Assembly 2008, 13 18 April, Vienna, Austria ...
http://epic.awi.de/18775/
ACP - Abstract - Precipitation isoscape of high reliefs: interpolation scheme designed and tested for monthly resolved...ACP - Abstract - Precipitation isoscape of high reliefs: interpolation scheme designed and tested for monthly resolved...
Abstract. Stable oxygen isotope composition of atmospheric precipitation (δ18Op) was scrutinized from 39 stations distributed over Switzerland and its border zone. Monthly amount-weighted δ18Op values averaged over the 1995-2000 period showed the expected strong linear altitude dependence (−0.15 to −0.22‰ per 100 m) only during the summer season (May-September). Steeper gradients (~ −0.56 to −0.60‰ per 100 m) were observed for winter months over a low elevation belt, while hardly any altitudinal difference was seen for high elevation stations. This dichotomous pattern could be explained by the characteristically shallower vertical atmospheric mixing height during winter season and provides empirical evidence for recently simulated effects of stratified atmospheric flow on orographic precipitation isotopic ratios. This helps explain anomalous deflected altitudinal water isotope profiles reported from many other high relief regions. Grids and isotope distribution maps of the ...
https://www.atmos-chem-phys.net/14/1897/2014/
How Does Oxygen Isotope Dating Work
In the next two lectures we will examine past climates (paleoclimates) and the forces. We have already discussed the importance of isotopes for rock dating. The ratio of these two oxygen isotopes has changed over the ages and these. Other factors which work in conjunction with the Earths orbital changes include.
http://bruceforstaterep.com/how-does-oxygen-isotope-dating-work_dg.html
Beyond the neutron drip line: The unbound oxygen isotopes (25)O and (26)OBeyond the neutron drip line: The unbound oxygen isotopes (25)O and (26)O
The very neutron-rich oxygen isotopes 25O and 26O are investigated experimentally and theoretically. The unbound states are populated in an experiment performed at the R3B-LAND setup at GSI via proton-knockout reactions from 26F and 27F at relativistic energies around 442 and 414 MeV/nucleon, respectively. From the kinematically complete measurement of the decay into 24O plus one or two neutrons, the 25O ground-state energy and width are determined, and upper limits for the 26O ground-state energy and lifetime are extracted. In addition, the results provide indications for an excited state in 26O at around 4 MeV. The experimental findings are compared to theoretical shell-model calculations based on chiral two- and three-nucleon (3N) forces, including for the first time residual 3N forces, which are shown to be amplified as valence neutrons are added ...
https://kuscholarworks.ku.edu/handle/1808/17879
Carbon mineralogy, phosphorus and oxygen isotope records from the Late Pleistocene at ODP Hole 1198 A (Leg 194 Marion Plateau,...Carbon mineralogy, phosphorus and oxygen isotope records from the Late Pleistocene at ODP Hole 1198 A (Leg 194 Marion Plateau,...
Carbon mineralogy, phosphorus and oxygen isotope records from the Late Pleistocene at ODP Hole 1198 A (Leg 194 Marion Plateau, Australia ...
https://www.research-collection.ethz.ch/handle/20.500.11850/4609
Advances in Agronomy, Vol. 125 by Donald L. Sparks - MyPantyClub.com E-books
Fertilizers Res. 45, 91-100. , 1961. Precipitation of silver phosphate from homogeneous solution. Anal. Chem. 33, 873-887. , 1982. UV-sensitive complex phosphorus: association with dissolved humic material and iron in a bog lake. Limnol. Oceonogr. 27, 564-569. , 2012. Variation in the photochemical lability of dissolved organic matter in a large boreal watershed. Aquatic Sci. 74, 751-768. , 1996. Inter- and intra-tooth variation in the oxygen isotope composition of mammalian tooth enamel: some implications for paleoclimatological and paleobiological research. Orig. Life Evol. Biosphere 29, 555-561. , 2005. Phosphine in soils, sludges, biogases and atmospheric implications-a review. Ecolog. Eng. 24, 457-463. , 2011a. Phosphate oxygen isotopes: insights into sedimentary phosphorus cycling from the Benguela upwelling system. Geochim. Cosmochim. Acta 75, 3741-3756. , 2011b. Marine sediment pore-water profiles of phosphate delta O-18 using a refined micro-extraction. Limnol. Oceanogr. Met. 9, ...
http://mypantyclub.com/ebooks/advances-in-agronomy-volume-125
Oxygen and carbon isotope compositions of middle Cretaceous vertebrates from North Africa and Brazil: Ecological and...
In order to investigate mid-Cretaceous terrestrial climates of low paleolatitudes, Moroccan, Tunisian and Brazilian vertebrate apatites have been analyzed for their oxygen and carbon isotope compositions of phosphates (delta O-18(p)) and carbonates (delta O-18(c), delta C-18(c)). At each site, coexisting theropod dinosaurs, titanosaurid sauropods, pterosaurs, crocodilians, turtles and fish have distinct delta O-18(p) and delta C-18(c) values reflecting their ecologies, diets and foraging environments. Oxygen isotope compositions of surface waters (delta O-18(w)) estimated from turtle and crocodile delta O-18(p) values range from -5.0 +/- 1.0 parts per thousand to -2.4 +/- 1.0 parts per thousand, which do not differ from mean annual rainwater values occurring today under inter-tropical sub-arid to arid climates. High water temperatures ranging from 21 +/- 6 degrees C to 34 +/- 2 degrees C deduced from fish delta O-18(p) values are in agreement with those published for mid-Cretaceous low ...
http://www.ipgp.fr/fr/oxygen-and-carbon-isotope-compositions-of-middle-cretaceous-vertebrates-from-north-africa-and-brazil
THE HOCKEY SCHTICK: New paper finds another non-hockey-stick in EnglandTHE HOCKEY SCHTICK: New paper finds another non-hockey-stick in England
Abstract: Few long and well-dated summer precipitation reconstructions that extend beyond the longest records of instrumental measurements exist in Europe. Further understanding of the past trends in summer precipitation and the mechanisms driving that variability are necessary to improve the predictions of climate models. Tree rings are unique in their ability to provide high-resolution, absolutely dated climate signals for the study of palaeoclimatology. The physiological processes controlling oxygen isotope composition (δ18O) in wood are reasonably well understood highlighting its potential as a climate proxy in a variety of environments. Significant correlation between wood δ18O and precipitation has been demonstrated worldwide reflecting both direct rainout processes and indirectly evaporative enrichment. We present an annually resolved reconstruction of precipitation based upon oxygen isotope variations in tree ring cellulose covering the most recent ˜400 years for England. The ...
http://hockeyschtick.blogspot.com/2013/06/new-paper-finds-another-non-hockey_9519.html
Contribution of soil respiration in tropical, temperate, and boreal forests to the18O enrichment of atmospheric O2
Contribution of soil respiration in tropical, temperate, and boreal forests to the18O enrichment of atmospheric O2 Academic Article ...
http://vivo.mblwhoilibrary.org/display/publication56119
Oxygen isotopes of dissolved sulfates in geothermal environme..|INISOxygen isotopes of dissolved sulfates in geothermal environme..|INIS
The authors report the analysis of the oxygen isotopic composition of sulfates dissolved in 102 samples of thermal waters coming from different contexts: sedimentary (Parisian Basin), volcanic (New Mexico, West Indies, Mont Dore in France), or base (France), with t
https://inis.iaea.org/search/search.aspx?num=10&orig_q=DEC%3A%22ENERGY%22&lang=en-US&login=false&user=External&src=ics&sort=date:D:L:d1&search-option=Everywhere&q=+inmeta:Volume%3D50+inmeta:PublicationYear%3D1987&dnavs=inmeta:Volume%3D50+inmeta:PublicationYear%3D1987
Targeted, Site-specific quantitation of N- and O-glycopeptides using (18)O-labeling and product ion based mass spectrometry. |...Targeted, Site-specific quantitation of N- and O-glycopeptides using (18)O-labeling and product ion based mass spectrometry. |...
The site-specific quantitation of N- and O-glycosylation is vital to understanding the function(s) of different glycans expressed at a given site of a protein under physiological and disease conditions. Most commonly used precursor ion intensity based quantification method is less accurate and other labeled methods are expensive and require enrichment of glycopeptides. Here, we used glycopeptide product (y and Y0) ions and (18)O-labeling of C-terminal carboxyl group as a strategy to obtain quantitative information about fold-change and relative abundance of most of the glycoforms attached to the glycopeptides. As a proof of concept, the accuracy and robustness of this targeted, relative quantification LC-MS method was demonstrated using Rituximab. Furthermore, the N-glycopeptide quantification results were compared with a biosimilar of Rituximab and validated with quantitative data obtained from 2-AB-UHPLC-FL method. We further demonstrated the intensity fold-change and relative abundance of 46 ...
http://www.ccamp.res.in/targeted-site-specific-quantitation-n-and-o-glycopeptides-using-18o-labeling-and-product-ion-based
Bioline International Official Site (site up-dated regularly)Bioline International Official Site (site up-dated regularly)
The Akiri vein copper mineralization was investigated for its carbon and oxygen isotopic composition to determine the characteristics of the mineralizing fluid. Carbon and oxygen isotope analyses of Akiri siderite range between δ13C values (-1.05 to -1.71‰) and δ13O values (-14.94 to -15.18) respectively. δ13C isotopic composition is comparable to values expected for Cretaceous marine carbonates. The 18O depletion in the vein siderite indicates dominant meteoric water sources involved for carbonates precipitation. This significant depletion between the δ18O compositions of Akiri siderite compared with carbonates from other parts of the basin probably indicate differential formational temperature or fluid composition ...
http://www.bioline.org.br/abstract?id=ja15031&lang=en
New and Exciting on PLoS ONE - A Blog Around The ClockNew and Exciting on PLoS ONE - A Blog Around The Clock
Biologic rhythms give insight into normal physiology and disease. They can be used as biomarkers for neuronal degenerations. We present a diverse data set to show that hair and teeth contain an extended record of biologic rhythms, and that analysis of these tissues could yield signals of neurodegenerations. We examined hair from mummified humans from South America, extinct mammals and modern animals and people, both healthy and diseased, and teeth of hominins. We also monitored heart-rate variability, a measure of a biologic rhythm, in some living subjects and analyzed it using power spectra. The samples were examined to determine variations in stable isotope ratios along the length of the hair and across growth-lines of the enamel in teeth. We found recurring circa-annual periods of slow and fast rhythms in hydrogen isotope ratios in hair and carbon and oxygen isotope ratios in teeth. The power spectra contained slow and fast frequency power, matching, in terms of normalized frequency, the ...
http://scienceblogs.com/clock/2007/07/27/new-and-exciting-on-plos-one-2/
THE HOCKEY SCHTICK: New study finds Medieval Warming Period and Little Ice Age were also present in AntarcticaTHE HOCKEY SCHTICK: New study finds Medieval Warming Period and Little Ice Age were also present in Antarctica
Ikaite crystals incorporate ocean bottom water into their structure as they form. During cooling periods, when ice sheets are expanding, ocean bottom water accumulates heavy oxygen isotopes (oxygen 18). When glaciers melt, fresh water, enriched in light oxygen isotopes (oxygen 16), mixes with the bottom water. The scientists analyzed the ratio of the oxygen isotopes in the hydration water and in the calcium carbonate. They compared the results with climate conditions established in Northern Europe across a 2,000-year time frame. They found a direct correlation between the rise and fall of oxygen 18 in the crystals and the documented warming and cooling periods. ...
http://hockeyschtick.blogspot.com/2012/03/new-study-finds-medieval-warming-period.html
North Atlantic region atmospheric circulation dynamics inferred from a late-Holocene lacustrine carbonate isotope record,...North Atlantic region atmospheric circulation dynamics inferred from a late-Holocene lacustrine carbonate isotope record,...
This thesis investigates how variations in the oxygen isotopic composition of lake waters in northern Fennoscandia are recorded in lake sediment archives, especially diatoms, and how these variations can be used to infer past changes in climate and atmospheric circulation. Results from analyses of the oxygen isotopic composition of lake water samples (δ18Olakew) collected between 2001 and 2006 show that δ18O of northern Fennoscandian lakes is mainly controlled by the isotopic composition of the precipitation (δ18Op). Changes in local δ18Op depend on variations in ambient air temperature and changes in atmospheric circulation that lead to changes in moisture source, vapour transport efficiency, or winter to summer precipitation distribution. This study demonstrates that the amount of isotopic variation in lake water δ18O is determined by a combination of the original δ18Olakew, the amount and timing of the snowmelt, the amount of seasonally specific precipitation and groundwater, any ...
http://su.diva-portal.org/smash/record.jsf?pid=diva2:187082
Polishgenes Blog: 2013Polishgenes Blog: 2013
ABSTRACT: In 2007 a ceremonial complex representing the Globular Amphora Culture was discovered in Kowal (the Kuyavia region, Poland). Radiocarbon dating demonstrated that the human remains associated with the complex are of similar antiquity, i.e. 4.105 ± 0.035 conv. and 3.990 ± 0.050 conv. Kyrs. After calibration, this suggests a period between 2850 and 2570 BC (68.2% likelihood), or more specifically, 2870 to 2500 BC (95.4% likelihood). Morphological data indicate that the skeleton belonged to a male who died at 27-35 years of age. The unusual morphology of his hard palate suggests this individual may have had a speech disorder. Stable oxygen isotope values of the individuals teeth are above the locally established oxygen isotope range of precipitation, but due to sample limitations we cannot conclusively say whether the individual is of non-local origin. Stable carbon and nitrogen isotope ratios were analyzed to reconstruct the diet of the studied individual, and show a terrestrial-based ...
http://polishgenes.blogspot.be/2013/
Variations in Salinity and Oxygen IsotopesVariations in Salinity and Oxygen Isotopes
You know that water is made of hydrogen and oxygen atoms arranged in molecules of H2O, but you may not be aware that there are different types of oxygen atoms. Different atoms of the same element are called isotopes. All oxygen atoms have 16 protons and 16 electrons, but some oxygen atoms have 16, 17, or 18 neutrons in the nucleus. The most abundant isotopes of oxygen in seawater are oxygen sixteen (16O) and oxygen eighteen (18O). Water molecules with 16O atoms evaporate more easily than water molecules with 18O atoms, so the relative numbers of 16O and 18O atoms that remain in the water change as evaporation occurs. Water from which 16O atoms have preferentially evaporated has a higher ratio of 18O to 16O atoms than water that has experienced less evaporation. As salinity also increases as evaporation occurs, we can generalize the relationship to state that water with an increased 18O to 16O ratio is saltier than water with a lower 18O to 16O ratio.. ! Click the red dot in the Caribbean to see ...
https://www.classzone.com/books/earth_science/terc/content/investigations/es2307/es2307page03.cfm?chapter_no=investigation
Oxygen and Sulfur Isotopes in Sulfate in Modern Euxinic Systems With Implications for Evaluating the Extent of Euxinia in...Oxygen and Sulfur Isotopes in Sulfate in Modern Euxinic Systems With Implications for Evaluating the Extent of Euxinia in...
Euxinic conditions, which are defined by the presence of sulfide in the water column, were common in ancient oceans. However, it is not clear how the presence of sulfide in the water column affects the balance between rates of sulfide oxidation and sulfate reduction, which plays a major role in regulating the net redox state of the ocean-atmosphere system. Euxinia could lead to higher rates of sulfide oxidation because sulfide may diffuse more rapidly into the oxic zone in solution than in sediment. Alternatively, sulfide oxidation could be inhibited by low overall availability of suitable oxidants in euxinic settings. Here, we constrain rates of sulfide oxidation versus sulfate reduction in four euxinic water columns in coastal ponds by modeling the evolution of the concentration and sulfur and oxygen isotope compositions of sulfate from post-hurricane, well-oxygenated conditions to modern, euxinic conditions. The results of the one-dimensional, depth-dependent models of water column sulfate ...
https://dash.harvard.edu/handle/1/41324823
Geographic assignment with stable isotopes in IsoMAP - Bowen - 2014 - Methods in Ecology and Evolution - Wiley Online LibraryGeographic assignment with stable isotopes in IsoMAP - Bowen - 2014 - Methods in Ecology and Evolution - Wiley Online Library
Ehleringer, J.R., Bowen, G.J., Chesson, L.A., West, A.G., Podlesak, D.W. & Cerling, T.E. (2008) Hydrogen and oxygen isotope ratios in human hair are related to geography. Proceedings of the National Academy of Sciences of the United States of America, 105, 2788-2793 ...
http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12147/references
The water flow of the Amazon River in a natural climate archive
Munich, Germany (SPX) Oct 05, 2012 - Oxygen isotopes in tree rings are an excellent archive of precipitation dynamics in the tropical Amazon region. The precise determination of the ratios of stable oxygen isotopes (18O/16O) proves to
http://www.terradaily.com/reports/The_water_flow_of_the_Amazon_River_in_a_natural_climate_archive_999.html
2016 W.M. Keck Science Department Publications and Grants | Claremont McKenna College2016 W.M. Keck Science Department Publications and Grants | Claremont McKenna College
Ng, J., B. Williams, D.M Thomson, and J. Halfar. Developing a forward model of encrusting coralline algae. Geochimica et Cosmochimica Acta, 194, 2016, 279-290.. Abstract: An increased number of climate proxy records and more refined interpretation of proxy data are crucial to improve projections of future climate at high latitudes, where internal feedbacks amplify warming and established high-resolution climate archives are especially sparse. Encrusting coralline algae are being developed as a mid- to high-latitude marine climate archive. These long-lived algae form a solid high-Mg calcite skeleton with annual growth bands similar to those of trees and tropical corals. The oxygen isotope ratio of the algal skeleton (d18Oalg) records local environmental and climatic factors, notably sea surface temperature and seawater d18O. Here we assess the d18Oalg-climate relationship in diverse environments across the algal habitat range utilizing two species of coralline algae from the genus ...
https://www.cmc.edu/publications-and-grants/2016-keck-science
2010: Identifying Eadgyth | News | University of Bristol2010: Identifying Eadgyth | News | University of Bristol
Teeth provide remarkable evidence about the early years of an individuals life. The region where a person grew up can be traced in the tooth enamel laid down in their first 14 years because strontium and oxygen isotope ratios in the teeth reflect the food a person ate and the water they drank. When rocks form, they contain minute traces of radioactive rubidium 87, which decays to strontium 87. Over millions of years, the ratio of strontium 87 to the stable isotope strontium 86 changes, so, in very young rocks, the ratio will be smaller than in very old rocks.. These rocks weather and become the soils where animals are grazed and crops grown. Some of the strontium in the soil gets into the meat and cereals produced from it and then into the teeth of the people who eat them. The strontium ratio in a persons teeth thus mirrors the strontium ratio of the geology of the area in which they spent their childhood. For example, someone who grew up in southern England would have a much lower ratio than ...
http://bristol.ac.uk/news/2010/7322.html
Water Resources Investigations Report 02-4192 AbstractWater Resources Investigations Report 02-4192 Abstract
The isotope mass-balance approach was used to estimate ground-water inflow to 81 lakes in the central highlands and coastal lowlands of central Florida. The study area is characterized by a subtropical climate and numerous lakes in a mantled karst terrain. Ground-water inflow was computed using both steady-state and transient formulations of the isotope mass-balance equation. More detailed data were collected from two study lakes, including climatic, hydrologic, and isotopic (hydrogen and oxygen isotope ratio) data. For one of these lakes (Lake Starr), ground-water inflow was independently computed from a water-budget study. Climatic and isotopic data collected from the two lakes were similar even though they were in different physiographic settings about 60 miles apart. Isotopic data from all of the study lakes plotted on an evaporation trend line, which had a very similar slope to the theoretical slope computed for Lake Starr. These similarities suggest that data collected from the detailed ...
https://fl.water.usgs.gov/Abstracts/wri02_4192_sacks.html
A controlled test of the du... - Researchers - ANUA controlled test of the du... - Researchers - ANU
Roden, J & Farquhar, G 2012, A controlled test of the dual-isotope approach for the interpretation of stable carbon and oxygen isotope ratio variation in tree rings, Tree Physiology, vol. 32, no. 4, pp. 490-503. ...
https://researchers.anu.edu.au/publications/72247
Water Isotope Analyzer News on Environmental XPRTWater Isotope Analyzer News on Environmental XPRT
Get the latest water isotope analyzer news on Environmental XPRT, the worlds largest environmental industry marketplace and information resource.
https://www.environmental-expert.com/news/keyword-water-isotope-analyzer-21983
Life history traits of the fish community in Lake Annecy: evidence from the stable isotope composition of otoliths | Knowledge...Life history traits of the fish community in Lake Annecy: evidence from the stable isotope composition of otoliths | Knowledge...
Knowledge and management of aquatic ecosystems (formerly Bulletin Français de la Pèche et de la Pisciculture), an international journal on freshwater ecosystem
https://www.kmae-journal.org/articles/kmae/abs/2015/01/kmae150105/kmae150105.html
Conifers, Angiosperm Trees, and Lianas: Growth, Whole-Plant Water and Nitrogen Use Efficiency, and Stable Isotope Composition ...Conifers, Angiosperm Trees, and Lianas: Growth, Whole-Plant Water and Nitrogen Use Efficiency, and Stable Isotope Composition ...
Whole-plant 13C discrimination, Δ13Cp, showed a strong correlation with instantaneous measurements of ci/ca (Fig. 7), suggesting that in general Δ13Cp was a faithful recorder of ci/ca, as predicted by Equation 6. The mean value for d that we estimated for the full data set was 3.1‰, reasonably similar to a value of 4.0‰, recently estimated for Ficus insipida (Cernusak et al., 2007b). The Δ13Cp was also a reasonably good predictor of variation in TEc, Dg·TEc, and vg·TEc (Table VI). We previously observed that the relationship between Δ13Cp and TEc broke down at the species level, appearing to reflect species-specific offsets in the relationship between the two parameters (Cernusak et al., 2007a). Whereas there was some evidence of similar behavior in this study, as can be seen in Figure 8, the species-level relationship between Δ13Cp and Dg·TEc was generally much stronger in this study. For example, in a least-squares linear regression between Δ13Cp and Dg·TEc using species means, ...
http://www.plantphysiol.org/content/148/1/642.long
Evaluating a 1981 temperature projection « RealClimateEvaluating a 1981 temperature projection « RealClimate
palindrom (#27 on the WUWT article)- Im doing my graduate work in the area of oxygen isotope paleothermometry (which I do think has a lot of advantage over dendroclimatology), so Ill just say a few general things, but I dont plan on reading the WUWT article in enough depth to disentangle it piece by piece (note for people who reply that Id rather continue this in the April Open Thread since it is OT and this thread is still young).. First, I do think that there is a lot of work to be done in the interpretation of oxygen/hydrogen isotope values obtained at a site, and theres still plenty of disagreement in the paleo-community on how to best connect the isotopic signal in a record with climate. However, there are also many well understood thermodynamic, physical principles at play. There are also a number of paleoclimatic recorders of oxygen isotopes, including lake/ocean records, speleothems (in caves), corals, ice cores, etc. The factors and caveats that impact all of these different ...
http://www.realclimate.org/index.php/archives/2012/04/evaluating-a-1981-temperature-projection/
Stable carbon and oxygen isotope ratios of benthic and planktonic foraminifera of ODP Hole 171-1049C, supplement to: Erbacher,...Stable carbon and oxygen isotope ratios of benthic and planktonic foraminifera of ODP Hole 171-1049C, supplement to: Erbacher,...
Ocean anoxic events were periods of high carbon burial that led to drawdown of atmospheric carbon dioxide, lowering of bottom-water oxygen concentrations and, in many cases, significant biological extinction (Arthur et al., 1990; Erbacher et al., 1996, doi:10.1130/0091-7613(1996)0242.3.CO;2; Kuypers et al., 1999, doi:10.1038/20659; Jenkyns, 1997; Hochuli et al., 1999, doi:10.1130/0091-7613(1999)0272.3.CO;2). Most ocean anoxic events are thought to be caused by high productivity and export of carbon from surface waters which is then preserved in organic-rich sediments, known as black shales. But the factors that triggered some of these events remain uncertain. Here we present stable isotope data from a mid-Cretaceous ocean anoxic event that occurred 112 Myr ago, and that point to increased thermohaline stratification as the probable cause. Ocean anoxic event 1b is associated with an increase in surface-water temperatures and runoff that led to decreased bottom-water formation and elevated carbon ...
http://b2find.eudat.eu/dataset/4485c4b2-f49f-5c52-9321-8621f3cfa3e5
Anderson, Lesleigh, 1999 - Holocene paleoclimatology of northern Alaska from oxygen isotope geochemistry of sediment cellulose...
Anderson, Lesleigh, 1999, Holocene paleoclimatology of northern Alaska from oxygen isotope geochemistry of sediment cellulose and authigenic carbonate in lake sediments: University of Massachusetts, Amherst, M.S. thesis, 139 p., illust., maps.. ...
http://dggs.alaska.gov/pubs/id/27429
Carbon and oxygen isotope variability among foraminifera and ostracod carbonated shells - Université Claude Bernard Lyon 1Carbon and oxygen isotope variability among foraminifera and ostracod carbonated shells - Université Claude Bernard Lyon 1
François Fourel, Francois Martineau, Emoke Toth, Agnes Görög, Gilles Escarguel, et al.. Carbon and oxygen isotope variability among foraminifera and ostracod carbonated shells. Physica, 2015, 70, pp.133-156. ⟨10.17951/aaa.2015.70.133⟩. ⟨hal-02334191⟩ ...
https://hal-univ-lyon1.archives-ouvertes.fr/hal-02334191
Oxygen isotope and palaeotemperature records from six Greenland ice-core stations: Camp Century, Dye-3, GRIP, GISP2, Renland...Oxygen isotope and palaeotemperature records from six Greenland ice-core stations: Camp Century, Dye-3, GRIP, GISP2, Renland...
Johnsen, S. J. , Dahl-Jensen, D. , Gundestrup, N. , Steffensen, J. P. , Clausen, H. B. , Miller, H. , Masson-Delmotte, V. , Sveinbjörnsdottir, A. E. and White, J. (2001): Oxygen isotope and palaeotemperature records from six Greenland ice-core stations: Camp Century, Dye-3, GRIP, GISP2, Renland and NorthGRIP , Journal of Quaternary Science ...
http://epic.awi.de/4518/
Carbon and oxygen isotope g... - Researchers - ANUCarbon and oxygen isotope g... - Researchers - ANU
Basak, C, Rathburn, T, Pérez, E et al 2009, Carbon and oxygen isotope geochemistry of live (stained) benthic foraminifera from the Aleutian Margin and the Southern Australian Margin, Marine Micropaleontology, vol. 70, pp. 89-101. ...
https://researchers.anu.edu.au/publications/15654
Thermophysiology of Tyrannosaurus rex: Evidence from Oxygen Isotopes | ScienceThermophysiology of Tyrannosaurus rex: Evidence from Oxygen Isotopes | Science
The oxygen isotopic composition of vertebrate bone phosphate (δp) is related to ingested water and to the body temperature at which the bone forms. The δp is in equilibrium with the individuals body water, which is at a physiological steady state throughout the body. Therefore, intrabone temperature variation and the mean interbone temperature differences of well-preserved fossil vertebrates can be determined from the δp variation. Values of δp from a well-preserved Tyrannosaurus rex suggest that this species maintained homeothermy with less than 4°C of variability in body temperature. Maintenance of homeothermy implies a relatively high metabolic rate that is similar to that of endotherms. ...
https://science.sciencemag.org/content/265/5169/222.abstract
Developing a stable isotope approach to trace the sources and metabolism of phosphorus in freshwaters - Lancaster EPrintsDeveloping a stable isotope approach to trace the sources and metabolism of phosphorus in freshwaters - Lancaster EPrints
The oxygen isotope ratio of dissolved inorganic phosphate (δ18Op) represents a novel and potentially powerful stable isotope tracer for biogeochemical research. Analysis of δ18Op may offer new insights into the relative importance of different sources of phosphorus within natural ecosystems. Due to the isotope fractionations that occur alongside metabolism of phosphorus-containing compounds, δ18Op could also be used to better understand the intracellular and extracellular reaction mechanisms that control phosphorus cycling. In this thesis, new methods were developed and tested for the extraction of dissolved inorganic phosphate (Pi) from freshwaters and its isolation from other oxygen-containing compounds, including nitrate, sulfate and dissolved organic matter. Excluding contaminant sources of oxygen during δ18Op analysis is a critical analytical challenge that has constrained δ18Op research in freshwaters to date. These new methods were evaluated against existing protocols for analysis of ...
https://eprints.lancs.ac.uk/id/eprint/86265/?template=browse
Geochemistry | LSU Department of Geology & GeophysicsGeochemistry | LSU Department of Geology & Geophysics
We have a strong theoretical, computational, experimental, and observational establishment in geochemistry. Research interest encompasses high-dimensional stable isotope fractionation, atmospheric chemistry, martian surface processes, early Earth, impacts, the Great Oxidation Event, snowball Earth, Paleozoic Earth climate, coupled mountain-building and climate change, coupled evolution of life and environment, paleoceanography, cryosphere geochemistry, property of man-made materials, and isotope equilibrium and kinetics. The department has fully equipped wet-chemistry laboratories, trace-element laboratory, organic geochemistry laboratory, and state-of-art stable isotope facilities that have the unique capability including analyzing triple oxygen isotope compositions of diverse compounds, and first-principles atomistic modeling with access to high-performance computers on campus. Faculty members ...
https://www.lsu.edu/science/geology/research_areas/geochemistry.php
LBA-ECO CD-02 Carbon, Nitrogen, Oxygen Stable Isotopes in Organic Material, BrazilLBA-ECO CD-02 Carbon, Nitrogen, Oxygen Stable Isotopes in Organic Material, Brazil
This data set reports the measurement of stable carbon, nitrogen, and oxygen isotope ratios in organic material (plant, litter and soil samples) in forest canopy profiles and pasture (grasses and shrubs) as well as corresponding carbon and nitrogen tissue concentrations in a number of different sites across Brazil. The sampling design captured the temporal variation in rainfall over the course of several years. Carbon and nitrogen isotope ratios can act as a proxy for interpreting aspects of the carbon and nitrogen cycles in Amazonian rainforests. Data are in three comma-delimited ASCII files. ...
https://cmr.earthdata.nasa.gov/search/concepts/C179002774-ORNL_DAAC.html
New study shows how giant tortoises, alligators thrived in High Arctic 50 million... ( A new study of the High Arctic clim...)New study shows how giant tortoises, alligators thrived in High Arctic 50 million... ( A new study of the High Arctic clim...)
...A new study of the High Arctic climate roughly 50 million years ago le...The new study which looked at temperatures during the early Eocene pe...The team used a combination of oxygen isotope ratios from fossil bone ...The team concluded the average temperatures of the warmest month on El...,New,study,shows,how,giant,tortoises,,alligators,thrived,in,High,Arctic,50,million,years,ago,biological,biology news articles,biology news today,latest biology news,current biology news,biology newsletters
http://www.bio-medicine.org/biology-news-1/New-study-shows-how-giant-tortoises--alligators-thrived-in-High-Arctic-50-million-years-ago-15048-1/
Lecture 30: The Moon
Moon formed of mostly Earths mantle debris, which explains the compositional similarities, especially the similar Oxygen isotope ratios. There are still lingering questions, but it does the best so far at explaining the observed properties of the Moon ...
http://www.astronomy.ohio-state.edu/~pogge/Ast161/Unit5/moon.html
Lansdown, J.M., 1992 - The carbon and hydrogen stable isotope composition of methane released from natural wetlands and...
The [delta]13rmC of CH4 emitted from the tropical Amazon river floodplain, temperate peat bogs in Washington and Minnesota, and the arctic Alaskan tundra was 59, 73, 66, and 65‰, respectively. The [delta]D of CH4 from these sites was 294, 308, 339, and 391‰, respectively, and a linear relationship was observed between the [delta]D of CH4 and soil water. A 13C balance between CH4, CO2, and soil organic matter indicated a higher percentage of CH4 production via methyl conversion at the Amazon floodplain than at the other wetland sites and that the anoxic CO2 flux was 1.5 to 2.0 times the CH4 flux. The 13C balance provided greater constraint on the anoxic CO2 flux than calculations based on soil water gradients. An in situ value of 0.774 for the hydrogen kinetic isotope effect during microbial CH4 oxidation was estimated from the increase in the [delta]13rmC of CH4 and [delta]D of CH4 in flux samples from the Amazon site. The average [delta]13rmC of CH4 released from an acidic peat bog in ...
http://dggs.dnr.state.ak.us/pubs/id/28259
Climate Scientists Successfully Deploy Water Isotope Analyzer at 11,000 Feet Altitude | PicarroClimate Scientists Successfully Deploy Water Isotope Analyzer at 11,000 Feet Altitude | Picarro
Mauna Loa, Hawaii and Sunnyvale, CA, USA - Climate scientists from the University of Colorado and the University of New Mexico studying the water cycle have successfully deployed a Picarro precision water isotope analyzer at a remote monitoring station near the top of Mauna Loa, Hawaii. Sampling water vapor at this extreme altitude (11,000 feet above sea level) is notoriously difficult because the water concentration can drop as low a few hundred parts per million. Yet the Picarro G1102-i, which utilizes WS-CRDS (wavelength scanned cavity ring down spectroscopy), is directly sampling the outside air at this location and providing simultaneous measurement of both δD and δ18O every ten seconds. The absolute calibration is checked with liquid water standards every few hours, which confirms that the instrument has virtually no drift over a six day period. During this extended period the standard deviation of all measurements has been 0.650/00 for δD and 0.080/00 for δ18O - levels of absolute ...
https://www.picarro.com/company/press-releases/2010/climate-scientists-successfully-deploy-water-isotope-analyzer-11000
It takes time to see the menu from the body: an experiment on stable isotope composition in freshwater crayfishes | Knowledge...It takes time to see the menu from the body: an experiment on stable isotope composition in freshwater crayfishes | Knowledge...
Knowledge and management of aquatic ecosystems (formerly Bulletin Français de la Pèche et de la Pisciculture), an international journal on freshwater ecosystem
https://www.kmae-journal.org/articles/kmae/abs/2015/01/kmae150055/kmae150055.html
A Change in the Geodynamics of Continental Growth 3 Billion Years Ago | ScienceA Change in the Geodynamics of Continental Growth 3 Billion Years Ago | Science
Models for the growth of continental crust rely on knowing the balance between the generation of new crust and the reworking of old crust throughout Earths history. The oxygen isotopic composition of zircons, for which uranium-lead and hafnium isotopic data provide age constraints, is a key archive of crustal reworking. We identified systematic variations in hafnium and oxygen isotopes in zircons of different ages that reveal the relative proportions of reworked crust and of new crust through time. Growth of continental crust appears to have been a continuous process, albeit at variable rates. A marked decrease in the rate of crustal growth at ~3 billion years ago may be linked to the onset of subduction-driven plate tectonics.. ...
http://science.sciencemag.org/content/335/6074/1334
Vertical sheep mobility along the altitudinal gradient through stable isotope analyses in tooth molar bioapatite, meteoric...Vertical sheep mobility along the altitudinal gradient through stable isotope analyses in tooth molar bioapatite, meteoric...
TY - JOUR. T1 - Vertical sheep mobility along the altitudinal gradient through stable isotope analyses in tooth molar bioapatite, meteoric water and pastures: A reference from the Ebro valley to the Central Pyrenees. AU - Tornero, Carlos. AU - Aguilera, Mónica. AU - Ferrio, Juan Pedro. AU - Arcusa, Héctor. AU - Moreno-García, Marta. AU - Garcia-Reig, Sheila. AU - Rojo-Guerra, Manuel. PY - 2018/8/10. Y1 - 2018/8/10. N2 - © 2016 Elsevier Ltd and INQUA Although the frequency of pastoral activities involving vertical sheep mobility has decreased over the last century, this is a herding strategy still used in the Ebro basin, where animals move from overwintering valley locations up to the Pyrenees from late spring to early autumn. Such practice allows herders to avoid the worst climatic conditions, seasonally balancing the great contrast between ecological zones in this region, from dry lowland Mediterranean steppe to wet mountain subalpine grasslands. As recent regional archaeological works have ...
https://portalrecerca.uab.cat/en/publications/vertical-sheep-mobility-along-the-altitudinal-gradient-through-st
Oxygen Isotope Effects on Electron Transfer to O 2 Probed Using Chemically Modified Flavins Bound to Glucose OxidaseOxygen Isotope Effects on Electron Transfer to O 2 Probed Using Chemically Modified Flavins Bound to Glucose Oxidase
Close The Infona portal uses cookies, i.e. strings of text saved by a browser on the users device. The portal can access those files and use them to remember the users data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser. ...
https://www.infona.pl/resource/bwmeta1.element.acs-doi-10_1021_ja047050e
Oxygen isotopes | LCZO-Data
Many studies of climate variability in the Tropical Ocean have used high-resolution chemical tracer records contained in coral skeletons. The complex architecture of coral skeletons may lead to the possibility of biases in coral records and it is therefore important to access the fidelity of coral geochemical records as environmental proxies. Coral skeletal records from the same coral colony, and even the same corallite, may show large variation due to differing extension rates, formational timing of the skeletal elements, colony topography, and sampling resolution. To assess the robustness of the skeletal record, we present d13C and d18O data based on different sampling resolutions, skeletal elements, and coral colonies of Montastraea faveolata species complex, the primary coral used for climate reconstruction in the Atlantic. We show that various skeletal elements produce different isotopic records. The best sampling rate to resolve the full annual range of sea surface temperature (SST) is 40 ...
https://www.sas.upenn.edu/lczodata/category/research-paper-keywords/oxygen-isotopes
Love in the Time of Chasmosaurs: Warm-Blooded Sea Monsters of the MesozoicLove in the Time of Chasmosaurs: Warm-Blooded Sea Monsters of the Mesozoic
A new study published in Science suggests that the great predators of Mesozoic seas, the plesiosaurs, icthyosaurs, and mosasaurs, maintained an average body temperature around 100 degrees Fahrenheit. This conclusion was achieved by studying the oxygen isotopes in their teeth; fish from the mesozoic and today - all cold-blooded, of course - show variation in their oxygen isotopes based on the temperature of water they live in. The marine reptiles of the Mesozoic dont show this variation. No matter what temperature water they lived in, they maintained a constant temperature and thus can be assumed to have been active predators adept at cornering the apex predator niche in all sorts of marine environments ...
https://chasmosaurs.blogspot.com/2010/06/warm-blooded-sea-monsters-of-mesozoic.html
Oxygen Jet Peel Facial Treatment Water Oxygen Machine With Almighty Oxygen Jet
High quality Oxygen Jet Peel Facial Treatment Water Oxygen Machine With Almighty Oxygen Jet from China, Chinas leading Oxygen Jet Peel Machine product market, With strict quality control Oxygen Jet Peel Machine factories, Producing high quality Oxygen Jet Peel Facial Treatment Water Oxygen Machine With Almighty Oxygen Jet products.
http://www.laserbeauty-equipment.com/china-oxygen_jet_peel_facial_treatment_water_oxygen_machine_with_almighty_oxygen_jet-8695123.html
Nitrogen Isotopic Variation in Irons and Other Fe-Ni Metal Rich Meteorites - Open Research OnlineNitrogen Isotopic Variation in Irons and Other Fe-Ni Metal Rich Meteorites - Open Research Online
The irons display a range in values which is to too large to be the result of fractionation processes in the nebula. An explanation involving primordial heterogeneity is favoured, with the iron meteorite parent bodies having sampled at least four isotopically distinct nitrogen reservoirs. One of the factors controlling the variation may be an input of 1%-rich nitrogen, together with 26Al, from a nova event prior to solar nebula collapse. The behaviour of nitrogen during core formation processes is also considered and compared with the observed nitrogen variation in the non-magmatic group lAB. Other secondary processes affecting nitrogen in the iron meteorites are also identified. The isotopic composition of nitrogen has been used to identify genetic links between iron and stony meteorites, thereby enhancing the normal technique based on oxygen isotopic composition (prohibited by the rarity of oxygen bearing minerals ...
https://oro.open.ac.uk/64544/
An oxygen-17 dynamic NMR study of the Pr-DOTA complex - Dalton Transactions (RSC Publishing)An oxygen-17 dynamic NMR study of the Pr-DOTA complex - Dalton Transactions (RSC Publishing)
The complex between 17O-enriched DOTA (tetraazacyclododecanetetraacetic acid) and praseodymium(iii) (Pr3+) was studied in aqueous solution by variable-temperature 17O NMR at 14.1 T. pH effects as well as the influence of metal ions free in solution were investigated. At low temperature, the so-called TSAP an
http://pubs.rsc.org/en/Content/ArticleLanding/2013/DT/C3DT52533C?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+rss%2FDT+%28RSC+-+Dalton+Trans.+latest+articles%29
Selective feeding in nematodes: a stable isotope analysis of bacteria and algae as food sources for free-living nematodes » ...Selective feeding in nematodes: a stable isotope analysis of bacteria and algae as food sources for free-living nematodes » ...
Laboratory experiments with stable isotopes (13C and 15N) were conducted to determine the importance of bacteria and algae as food sources for free-living nematodes. All tested bacterivorous nematodes (Caenorhabditis elegans, Acrobeloides tricornis, Poikilolaimus sp. and Panagrolaimus sp.) were found to be depleted in δ13C (on average by −1.71 ± 0.56‰) and enriched in δ15N (on average by 3.17 ± 1.27‰) relative to their bacterial diets of Escherichia coli and Matsuebacter sp. The nematode species showed considerable differences in their stable isotope composition with respect to food sources. Moreover, they differed significantly in δ13C and δ15N values when placed on the same bacterial diet of E. coli, consistent with differences in their trophic shifts. Conversely, no differences in δ13C values were observed among nematode species placed on the same Matsuebacter sp. diet. In mixed food sources of E. coli and Matsuebacter sp., E. coli contributed 71% of the carbon to C. elegans and
http://booksandjournals.brillonline.com/content/journals/10.1163/156854112x639900
OXIDATIVE PHOSPHORYLATION: Kinetic and Thermodynamic Correlation between Electron Flow, Proton Translocation, Oxygen...OXIDATIVE PHOSPHORYLATION: Kinetic and Thermodynamic Correlation between Electron Flow, Proton Translocation, Oxygen...
1. Mitchell P. Coupling of phosphorylation to electron and hydrogen transfer by a chemiosmotic type of mechanism. Nature. 1961;191:144-8 2. Brand MD. The stoichiometry of proton pumping and ATP synthesis in mitochondria. The Biochemist. 1994;16:20-4 3. Chance B, Williams GR. The Respiratory Chain and Oxidative Phosphorylation. Adv Enzymol Relat Subj Biochem. 1956;17:65-134 4. Berg JM, Tymoczko JL, Stryer L. The rate of oxidative phosphorylation is determined by the need for ATP. Biochemistry, 5thEdition. New York, USA: Freeman WH & Co. 2002:552 5. Boyer PD, Cross RL, Momsen W. A new concept for energy coupling in oxidative phosphorylation based on a molecular explanation of the oxygen exchange reactions. Proc Natl Acad Sci USA. 1973;70:2837-39 6. Kayalar C, Rosing J, Boyer PD. An alternating site sequence for oxidative phosphorylation suggested by measurement of substrate binding patterns and exchange reaction inhibitions. J Biol Chem. 1977;252:2486-91 7. Milgrom YM, Cross RL. ...
http://www.medsci.org/v05p0143.htm
Search Results | Human KineticsSearch Results | Human Kinetics
Rugby League is a high-intensity collision sport competed over 80 min. Training loads are monitored to maximize recovery and assist in the design of nutritional strategies although no data are available on the total energy expenditure (TEE) of players. We therefore assessed resting metabolic rate (RMR) and TEE in six Super League players over 2 consecutive weeks in-season including one game per week. Fasted RMR was assessed followed by a baseline urine sample before oral administration of a bolus dose of hydrogen (deuterium 2H) and oxygen (18O) stable isotopes in the form of water (2H2 18O). Every 24 hr thereafter, players provided urine for analysis of TEE via DLW method. Individual training load was quantified using session rating of perceived exertion (sRPE) and data were analyzed using magnitude-based inferences. There were unclear differences in RMR between forwards and backs (7.7 ± 0.5 cf. 8.0 ± 0.3 MJ, respectively). Indirect calorimetry produced RMR values most likely lower than ...
https://journals.humankinetics.com/search?f_0=author&q_0=Warren+Jeremy+Bradley
PSRD: Compositional Balancing Before Moon FormationPSRD: Compositional Balancing Before Moon Formation
The identical oxygen isotopic composition of Earth and Moon might be explained by exchange of material between the proto-Earth and the surrounding proto-lunar disk: Planetary Science Research Discoveries (PSRD) educational on-line space science magazine.
http://www.psrd.hawaii.edu/Feb08/EarthMoonFormation.html
Difference between revisions of User:Andy Maloney/Water isotope effects on kinesin and microtubules - OpenWetWareDifference between revisions of User:Andy Maloney/Water isotope effects on kinesin and microtubules - OpenWetWare
The linearity of the assays run with D2O and H218O are quite remarkable. The decrease in speed for the D2O assay is about 21% and the decrease in the H218 assay is about 5%. The viscosity of D2O is about 20% greater than H2O while H218 is 5% greater than H2O. The speed differences measured would suggest in light of the viscosity numbers that we measured a viscous change in the solvent and not an osmotic pressure change. These results are quite remarkable as they indicate that gliding motility speeds can measure small viscous changes in solutions. Kotyk et. al. (Kotyk 1990) showed that ATP activity was not affected by the addition of D2O using yeast as the test subject. Our data would suggest that ATP activity of kinesin is also not affected by the addition of D2O. If ATP activity was hindered by the addition of D2O then I would have expected to see slower speeds than what I measured using D2O because clearly, there is a viscous affect and anything lower than what I measured would indicate that ...
https://openwetware.org/wiki/?title=User:Andy_Maloney/Water_isotope_effects_on_kinesin_and_microtubules&diff=499838&oldid=499818
In search of the Earth-forming reservoir: Mineralogical, chemical, and isotopic characterizations of the ungrouped achondrite...In search of the Earth-forming reservoir: Mineralogical, chemical, and isotopic characterizations of the ungrouped achondrite...
Burkhardt, C., Dauphas, N., Tang, H., Fischer-Gödde, M., Qin, L., Chen, J. H., Rout, S. S., Pack, A., Heck, P. R. and Papanastassiou, D. A.. Meteoritics & Planetary Science. doi: 10.1111/maps.12834. LINK. High-precision isotope data of meteorites show that the long-standing notion of a chondritic uniform reservoir is not always applicable for describing the isotopic composition of the bulk Earth and other planetary bodies. To mitigate the effects of this isotopic crisis and to better understand the genetic relations of meteorites and the Earth-forming reservoir, we performed a comprehensive petrographic, elemental, and multi-isotopic (O, Ca, Ti, Cr, Ni, Mo, Ru, and W) study of the ungrouped achondrites NWA 5363 and NWA 5400, for both of which terrestrial O isotope signatures were previously reported. Also, we obtained isotope data for the chondrites Pillistfer (EL6), Allegan (H6), and Allende (CV3), and compiled available anomaly data for undifferentiated and differentiated meteorites. The ...
http://karmaka.de/?p=12072
Development of a Web-Based GIS for Groundwater Exploration in Arid Lan by Nakul ManochaDevelopment of a Web-Based GIS for Groundwater Exploration in Arid Lan by Nakul Manocha
A three-fold exercise was conducted to assess the groundwater potentiality in the Eastern Desert (ED) of Egypt. First, a database was generated to host all relevant data sets in a GIS environment for a better understanding of the spatial relationships between these data sets. Co-registered digital mosaics were generated from relevant data sets including remote sensing (e.g., Landsat TM, SIR-C, SRTM, TRMM), geochemical (solute concentrations, O and H stable isotope composition), geological (geologic maps), and hydrological (lithology, depth to water table) data sets. Second, a web-based GIS interface (ArcIMS) was developed to provide a vehicle for data analysis, visualization, and dissemination. Finally, using the developed web-based GIS, locations for potential productive wells (168) targeting four types of shallow ( |200m) reservoirs were identified. The targeted reservoir types are: (1) Nubian Aquifer groundwater residing in shallow alluvial aquifers, (2) meteoric groundwater reservoirs in fractured
https://scholarworks.wmich.edu/masters_theses/3914/
Honkon Facial Cleaning Acne Removal Water Oxygen Jet Peel Beauty Machine for Sale - Unice LaserHonkon Facial Cleaning Acne Removal Water Oxygen Jet Peel Beauty Machine for Sale - Unice Laser
HONKON Facial Cleaning Acne Removal Water Oxygen Jet Peel Beauty Machine For SaleTreatment TheoryWater and Oxygen Jet is an effective acne treatment system, which mixes water,medical oxygen and nutrition liquid sufficien...
https://unicelaser.com/product/honkon-facial-cleaning-acne-removal-water-oxygen-jet-peel-beauty-machine-for-sale/
WoRMS - World Register of Marine Species - Pecten kupei Fleming, 1951 †WoRMS - World Register of Marine Species - Pecten kupei Fleming, 1951 †
source of synonymy Beu A.G. 2006. Marine Mollusca of oxygen isotope stages of the last 2 million years in New Zealand. Part 2. Biostratigraphically useful and new Pliocene to recent bivalves. Journal of the Royal Society of New Zealand, 36(4): 151-338 ...
http://www.marinespecies.org/aphia.php?p=taxdetails&id=565176
JISCMail - BRITARCH ArchivesJISCMail - BRITARCH Archives
John, Take a look at the analysis of the Oxygen Isotopes of the three burials that were excavated consisting of an adult woman and two children. For the life of me I cannot remember the place but it featured on Meet the Ancestors and had teh biggest hole I have ever seen in Archaeology. Th eisotope analysis showed the woman and children to have walked a considerable distance Rob http://acorngenealogy.co.uk http://www.enchantedtimes.co.uk ----- Original Message ----- From: John Wood ,[log in to unmask], To: ,[log in to unmask], Sent: Monday, July 17, 2006 11:17 AM Subject: Re: [BRITARCH] Heritage & carbon emissions ,,,Kevin Tolley ,[log in to unmask], wrote: , , As such, if Stonehenge were a place to , visit, then why shouldnt people from distant places , visit? ,,, , , No doubt people from some distance would have visited Stonehenge but what , concerns me is the numbers along with the distances. , , Trades people no doubt moved about the countryside trading goods and , hence we get a spread ...
https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=ind0607&L=britarch&F=&S=&P=176077
Antarctic Master Directory
This data set consists of CO2 concentrations from oxygen isotopes in air trapped in the Taylor Dome (Antarctica) ice core from 20 to 60 kyr BP. The data set consists of depth (m), ice age (kyr BP ... ...
https://gcmd.gsfc.nasa.gov/KeywordSearch/Freetext.do?KeywordPath=&Portal=amd&MetadataType=0&Freetext=DIF%2FIDN_Node%3A+AMD
Plus itPlus it
Using reconstructed unconformity-bounded stratigraphy, the geological evolution of Panarea and surrounding islets can be described in terms of the interaction between the growing volcano and sea-level fluctuations. From the recognition of marine deposits corresponding to marine oxygen isotope stage (MIS) 5 and of widespread Brown Tuff-type pyroclastic deposits on Panarea, two first-order unconformities (UI and UII) of regional stratigraphic significance can be correlated with the island of Lipari and adopted as a means of correlation on an inter-island scale in the Aeolian Volcanic District. Then, two second-order and three third-order unconfomities, consisting of erosional surfaces related to minor sea-level fluctuations or to subaerial reworking operating during the phases of volcanic inactivity, are introduced. The construction of the volcanic edifice occurred during seven successive eruptive epochs of local volcanic activity, between 150 and 10 ka, with intervening dormant periods ...
http://jgs.lyellcollection.org/content/164/5/983
KAKEN - Researchers | SUDO Kengo (40371744)KAKEN - Researchers | SUDO Kengo (40371744)
Affiliation：名古屋大学,環境学研究科,准教授, Research Field：Environmental dynamic analysis,Meteorology/Physical oceanography/Hydrology,Environmental dynamic analysis, Keywords：大気化学,化学輸送モデル,大気酸化能,対流圏オゾン,エアロゾル,化学気候モデル,大気汚染,メタン,成層圏オゾン,気候変動, # of Research Projects：7, # of Research Products：120, Ongoing Project：Quantifying nitrate dynamics in hydrosphere using triple oxygen isotopes as tracers
https://nrid.nii.ac.jp/nrid/1000040371744/
ANS / Publications / Journals / Fusion Science and Technology / Volume 41 / Number 3P2 / Pages 1064-1068ANS / Publications / Journals / Fusion Science and Technology / Volume 41 / Number 3P2 / Pages 1064-1068
In most current designs of D-T fusion reactor blankets employing ceramic breeder materials, the use of a helium sweep gas containing 0.1 % of hydrogen is contemplated to extract tritium efficiently via isotopic exchange reactions. However, the isotope exchange reaction proceeds fast only at the more elevated temperatures, so that the rate of isotope exchange reactions is considerably low at lower temperatures. Taking into consideration that there is a broad temperature distribution within a blanket module, it is anticipated that the tritium bred in regions of lower temperatures will be poorly recovered. For this reason, there is still a need to develop techniques that contribute to the acceleration of the recovery of bred tritium at lower temperatures. In our previous works, the effect of catalytic active metal additives, such as Pt and Pd, on the heterogeneous isotope exchange reactions at the breeder-sweep gas interface was examined. The results indicate that the exchange reactions were ...
http://www.ans.org/pubs/journals/fst/a_22747
DGIST Scholar: Distinct Reactivity of a Mononuclear Peroxocobalt(III) Species toward Activation of NitrilesDGIST Scholar: Distinct Reactivity of a Mononuclear Peroxocobalt(III) Species toward Activation of Nitriles
A mononuclear side-on peroxocobalt(III) complex with a tetradentate macrocyclic ligand, [CoIII(TBDAP)(O2)]+ (1), shows a novel and facile mode of dioxygenase-like reactivity with nitriles (R - C=N; R = Me, Et, and Ph) to produce the corresponding mononuclear hydroximatocobalt(III) complexes, [CoIII(TBDAP)(R - C(=NO)O)]+, in which the nitrile moiety is oxidized by two oxygen atoms of the peroxo group. The overall reaction proceeds in one-pot under ambient conditions (ca. 1 h, 40 °C). 18O-Labeling experiments confirm that both oxygen atoms are derived from the peroxo ligand. The structures of all products, hydroximatocobalt(III) complexes, were confirmed by X-ray crystallography and various spectroscopic techniques. Kinetic studies including the Hammett analysis and isotope labeling experiments suggest that the mechanistic mode of 1 for activation of nitriles occurs via a concerted mechanism. This novel reaction would be significantly valuable for expanding the chemistry for nitrile activation ...
http://scholar.dgist.ac.kr/handle/20.500.11750/4413
Environmental impacts
Objectives. To assess the environmental impacts of handling, storage and field application of fermentates as influenced by the carbon and nutrient pools defined in WP3.. Method. A pilot-scale storage facility will be used to determine GHG and NH3 emission factors for selected fermentates; this will be planned and conducted in collaboration with ATB. As input for improved models of N2O emissions and carbon storage after field application, a mesocosm will be designed. It will allow fermentate to be added to soil at well-defined matric potential. Experiments with fermentates from a large variety of different biomasses, digested. using different retention times and temperatures, will be carried out. Interactions with soil type and water content will be studied. Fluxes of CH4, N2O and CO2 will be measured using gas chromatography, and fluxes of NH3 using an INNOVA photo-acoustic analyser. Sources of N2O will be studied using an LGR N2O isotope analyser. In order to determine the influence of ...
http://biochain.dk/project/wp4-2.html
Lab Personnel - Barbara Sherwood Lollar Research GroupLab Personnel - Barbara Sherwood Lollar Research Group
My research is focused on the ubiquitous presence of saline fluids at depth in the continental crust, either in sedimentary systems or within crystalline basement in fracture controlled systems. How did these fluids gain their actual salinities, which can be up to 10 times the modern seawater salinity? What is the time scale in which this deep reservoir of the hydrosphere exchanges with surface reservoir such as the oceans or more diluted shallower groundwaters? Conservative chlorine and bromine stable isotopes (respectively 37Cl/35Cl and 81Br/79Br) can be used as source tracers to identify mixing in this kind of fluids. Furthermore they have been used to identify processes at the origin of the salinity or to constrain diffusion in low permeability environments. Im also focusing on classic water isotope composition (18O and 2H) to assess the extent of water-rock interaction and its relation to the generation of abiogenic reduced gas such as CH4 or H2 in the Canadian Shield ...
https://bsherwoodlollar.weebly.com/lab-personnel.html
Evaluation of a High-Intensity Focused Ultrasound-Immobilized Trypsin Digestion and 18 O-Labeling Method for...Evaluation of a High-Intensity Focused Ultrasound-Immobilized Trypsin Digestion and 18 O-Labeling Method for...
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https://www.infona.pl/resource/bwmeta1.element.acs-doi-10_1021_ac802540s
Density Functional Characterization of the Catalytic Mechanism of [(triphos)Ir(DBTC)]+ with O2: an Insight into Enzymatic...
The catalytic mechanism of intra and extra catechol cleaving dioxygenases is still a matter of debate, because the intermediate transient oxygen adduct has never been isolated in these enzymes. The complex [(triphos)Ir(dtbc)]+ (triphos=MeC(CH2PPh2)3, DBTC2−=3,5-di-tert-butylcatecholate), reacts with molecular oxygen and exhibits a ring-cleaving catalytic activity, and a stable oxygen intermediate appears; this stimulates an opportunity for obtaining information that can be transferable to the above-mentioned enzymatic catalytic centers, therefore, giving a breakthrough into the strategy of oxygen activation in these natural systems. Here, we present the results of our computational approach, based on density functional theory, focusing on the following aspects: to explain the interaction with molecular oxygen and how to avoid the existing spin problem, to understand the formation of the bridging moiety, to clarify, if any, the possible influence on the structure of the formed adduct of the ...
https://flore.unifi.it/handle/2158/319321
Properties of and oxygen binding by albumin-tetraphenylporphyrinatoiron(II) derivative complexes<...
TY - JOUR. T1 - Properties of and oxygen binding by albumin-tetraphenylporphyrinatoiron(II) derivative complexes. AU - Tsuchida, Eishun. AU - Ando, Katsutoshi. AU - Maejima, Hiromitsu. AU - Kawai, Noriyuki. AU - Komatsu, Teruyuki. AU - Takeoka, Shinji. AU - Nishide, Hiroyuki. PY - 1997/7/1. Y1 - 1997/7/1. N2 - A hydrophobic tetraphenylporphyrinatoiron(II) derivative bearing a covalently bound axial imidazole [Fe(II)P] was efficiently and noncovalently bound into human serum albumin (HSA) up to an average of eight Fe(II)P molecules per HSA molecule. The aqueous solutions of the HSA-Fe(II)P complex provided a reversible and relatively stable oxygen adduct under physiological conditions (pH 7.4 and 37 °C). The half-life of the oxygen adduct (τ( 1/4 )) was 1 h at 37 °C in an air atmosphere. With Fe(II)-TpivPP (the so-called picket-fence heme) having no axial base, an oxygenated HSA-Fe(II)TpivPP complex was obtained using a 20-fold molar excess of 1,2-dimethylimidazole, but the τ( 1/4 ) was ...
https://waseda.pure.elsevier.com/en/publications/properties-of-and-oxygen-binding-by-albumin-tetraphenylporphyrina
Altabet, MA; Francois, R (2003): Natural nitrogen and carbon stable isotopic composition of station NBP96-04-06-4Altabet, MA; Francois, R (2003): Natural nitrogen and carbon stable isotopic composition of station NBP96-04-06-4
Altabet, Mark A; Francois, Roger (2003): Natural nitrogen and carbon stable isotopic composition of station NBP96-04-06-4. PANGAEA, https://doi.org/10.1594/PANGAEA.128214
https://doi.pangaea.de/10.1594/PANGAEA.128214
Isotopes of oxygenIsotopes of oxygen
As some methods of isotope separation enrich not only heavier isotopes of hydrogen but also heavier isotopes of oxygen when ... Isotopes of oxygen, Oxygen, Lists of isotopes by element). ... Natural oxygen is made of three stable isotopes, 16 O , 17 O , ... Due to natural oxygen being mostly 16 O samples enriched with the other stable isotopes can be used for isotope labeling. For ... There are three known stable isotopes of oxygen (8O): 16 O , 17 O , and 18 O . Radioactive isotopes ranging from 11 O to 28 O ...
https://en.wikipedia.org/wiki/Isotopes_of_oxygen
Oxygen isotope ratio cycleOxygen isotope ratio cycle
... s are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the ... ventilation and so on affect the accuracy of oxygen isotope measurements. Solid samples (organic and inorganic) for oxygen ... Oxygen isotope analysis considers only the ratio of 18O to 16O present in a sample. The calculated ratio of the masses of each ... Oxygen (chemical symbol O) has three naturally occurring isotopes: 16O, 17O, and 18O, where the 16, 17 and 18 refer to the ...
https://en.wikipedia.org/wiki/Oxygen_isotope_ratio_cycle
Clumped isotopesClumped isotopes
Oxygen isotopes and sea level. Nature 324, 137-140. C. Waelbroeck, L. Labeyrie, E. Michel, et al., (2002) Sea-level and deep ... Clumped isotopes are heavy isotopes that are bonded to other heavy isotopes. The relative abundance of clumped isotopes (and ... the study of which forms the basis of clumped isotope geochemistry. When a heavier isotope substitutes for a lighter isotope (e ... Fractionation of the stable isotopes of oxygen and carbon in carbon dioxide during the reaction of calcite with phosphoric acid ...
https://en.wikipedia.org/wiki/Clumped_isotopes
DeuteriumDeuterium
The heavy isotopes of hydrogen and oxygen in rainwater (so-called meteoric water) are enriched as a function of the ... "Oxygen - Isotopes and Hydrology". SAHRA. Archived from the original on 2 January 2007. Retrieved 10 September 2007. West JB ( ... Measurements of small variations in the natural abundances of deuterium, along with those of the stable heavy oxygen isotopes ... also differentially alter the ratios of heavy hydrogen and oxygen isotopes in fresh and salt waters, in characteristic and ...
https://en.wikipedia.org/wiki/Deuterium
Titanium in zircon geothermometryTitanium in zircon geothermometry
Valley, John W. (Jan 2003). "Oxygen Isotopes in Zircon". Reviews in Mineralogy and Geochemistry. 53 (1): 343-385. Bibcode: ... Kinny, Peter D.; Maas, Roland (Jan 2003). "Lu-Hf and Sm-Nd isotope systems in zircon". Reviews in Mineralogy and Geochemistry. ... Zircon is also useful because its incorporation of other elements like uranium, lutetium, samarium, and oxygen can be analyzed ... Slow diffusion rates also prevent contamination by leaking or loss of isotopes from the crystal, increasing the likelihood that ...
https://en.wikipedia.org/wiki/Titanium_in_zircon_geothermometry
Isotope geochemistryIsotope geochemistry
Oxygen has three stable isotopes, 16O, 17O, and 18O. Oxygen ratios are measured relative to Vienna Standard Mean Ocean Water ( ... Typically, the VPDB oxygen reference is used for paleoclimate, while VSMOW is used for most other applications. Oxygen isotopes ... USGS Tritium/Helium-3 Dating Hydrologic Isotope Tracers - Helium Cosmogenic isotopes Environmental isotopes Geochemistry ... Carbon has two stable isotopes, 12C and 13C, and one radioactive isotope, 14C. The stable carbon isotope ratio, δ13C, is ...
https://en.wikipedia.org/wiki/Isotope_geochemistry
Stable isotope ratioStable isotope ratio
Species of Foraminifera incorporate oxygen as calcium carbonate in their shells. The ratio of the oxygen isotopes oxygen-16 and ... The relative abundance of such stable isotopes can be measured experimentally (isotope analysis), yielding an isotope ratio ... This field is termed stable isotope geochemistry. Measurement of the ratios of naturally occurring stable isotopes (isotope ... oxygen and sulfur) are also finding uses in ecological and biological studies. Other workers have used oxygen isotope ratios to ...
https://en.wikipedia.org/wiki/Stable_isotope_ratio
Hydrogen isotope biogeochemistryHydrogen isotope biogeochemistry
Hydrogen and oxygen isotopes in water thus serve as an excellent tracer of the hydrological cycle both globally and locally. ... isotope ratios of the bulk chemical mixture, or isotope ratios of individual constituent compounds. Stable isotopes of carbon ... Hydrogen and oxygen isotopes also work as tracers for water budget in terrestrial reservoirs, including lakes, rivers, ... Hou et al., 2008 Sachse et al., 2012 Soto, D. X., Wassenaar, L. I., Hobson, K. A., (2013) Stable hydrogen and oxygen isotopes ...
https://en.wikipedia.org/wiki/Hydrogen_isotope_biogeochemistry
TyrannosaurusTyrannosaurus
Oxygen isotope ratios in fossilized bone are sometimes used to determine the temperature at which the bone was deposited, as ... Barrick, R. E.; Stoskopf, M. K.; Showers, W. J. (1999). "Oxygen isotopes in dinosaur bones". In Farlow, J. O.; Brett-Surman, M ... Other scientists have pointed out that the ratio of oxygen isotopes in the fossils today does not necessarily represent the ... Trueman, C.; Chenery, C.; Eberth, D. A.; Spiro, B. (2003). "Diagenetic effects on the oxygen isotope composition of bones of ...
https://en.wikipedia.org/wiki/Tyrannosaurus
Fractionation of carbon isotopes in oxygenic photosynthesisFractionation of carbon isotopes in oxygenic photosynthesis
Guy, R. D.; Fogel, M. L.; Berry, J. A. (1993-01-01). "Photosynthetic Fractionation of the Stable Isotopes of Oxygen and Carbon ... Understanding these variations in carbon fractionation across species is applied in isotope geochemistry and ecological isotope ... then releases molecular oxygen as a product. Organic carbon contains less of the stable isotope Carbon-13, or 13C, relative to ... CS1 errors: missing title, CS1 maint: others, Isotope separation, Isotopes of carbon). ...
https://en.wikipedia.org/wiki/Fractionation_of_carbon_isotopes_in_oxygenic_photosynthesis
Heavy isotope dietHeavy isotope diet
Shchepinov, Mikhail S (2007). "Reactive Oxygen Species, Isotope Effect, Essential Nutrients, and Enhanced Longevity". ... A heavy isotope diet is one in that contains nutrients in which some atoms are replaced with their heavier non-radioactive ... One of the most pernicious and irreparable types of oxidative damage inflicted by reactive oxygen species (ROS) upon ... Li, Xiyan; Snyder, Michael P (2016). "Yeast longevity promoted by reversing aging-associated decline in heavy isotope content ...
https://en.wikipedia.org/wiki/Heavy_isotope_diet
Dole effectDole effect
Isotopes of oxygen Dole, Malcolm (1936). "The Relative Atomic Weight of Oxygen in Water and in Air". Journal of Chemical ... The Dole effect, named after Malcolm Dole, describes an inequality in the ratio of the heavy isotope 18O (a "standard" oxygen ... 1989). "Differential fractionation of oxygen isotopes by cyanide-resistant and cyanide-sensitive respiration in plants". Planta ... Morita, N. (1935). "The increased density of air oxygen relative to water oxygen". J. Chem. Soc. Japan. 56: 1291. Kroopnick, P ...
https://en.wikipedia.org/wiki/Dole_effect
CI chondriteCI chondrite
Oxygen isotope studies had been performed before the modern era, both on Earth rocks and meteorites. However, isotope ... Although the carbon and nitrogen isotopes are closer to CI, the oxygen isotopes, which predominate, are not CI-like. Tagish ... These are the macroscopic samples with the heaviest oxygen in the Solar System. Oxygen isotope studies and classification have ... with different isotope ratios. The three stable O-isotopes are 16O, 17O, and 18O. A "three-isotope plot" (17O/16O axis versus ...
https://en.wikipedia.org/wiki/CI_chondrite
Robert N. ClaytonRobert N. Clayton
Clayton and Mayeda studied variations in the ratio of oxygen-17 and oxygen-18 to the most abundant isotope oxygen-16, building ... Clayton worked in the field of cosmochemistry and is best known for the use of the stable isotopes of oxygen to classify ... Clayton and Mayeda studied the Achondrite meteorites and showed that variations in the oxygen isotope ratios within a planet ... Clayton, Robert N.; Onuma, Naoki; Mayeda, Toshiko K. (1976-04-01). "A classification of meteorites based on oxygen isotopes". ...
https://en.wikipedia.org/wiki/Robert_N._Clayton
Trace metal stable isotope biogeochemistryTrace metal stable isotope biogeochemistry
Mandernack KW, Bazylinski DA, Shanks WC, Bullen TD (September 1999). "Oxygen and iron isotope studies of magnetite produced by ... When isotopes diffuse, the lower mass isotopes diffuse more quickly than the heavier isotopes, resulting in fractionation. This ... Stable iron isotopes are described as the relative abundance of each of the stable isotopes with respect to 54Fe. The standard ... Diffusion of isotopes through a solution or material can also result in fractionations, as the lighter mass isotopes are able ...
https://en.wikipedia.org/wiki/Trace_metal_stable_isotope_biogeochemistry
Toshiko MayedaToshiko Mayeda
They studied variations in the abundances of the stable isotopes of oxygen, oxygen-16, oxygen-17 and oxygen-18, and deduced ... From the 1970s until the late 1990s Mayeda and Clayton became famous for their use of oxygen isotopes to classify meteorites. ... They used mass spectrometry to measure oxygen isotopes in the shells of marine molluscs which gave information on the ... Mayeda and Clayton's first research paper considered the use of Bromine pentafluoride to extract Isotopes of oxygen from rocks ...
https://en.wikipedia.org/wiki/Toshiko_Mayeda
SiltSilt
Blatt, H. (1 March 1987). "Perspectives; Oxygen isotopes and the origin of quartz". Journal of Sedimentary Research. 57 (2): ...
https://en.wikipedia.org/wiki/Silt
Minze StuiverMinze Stuiver
In the 1990s, in addition to continued work on radiocarbon calibration and solar variability, he began work on oxygen isotopes ... Stuiver, M. and P. M. Grootes (2000). "GISP2 oxygen isotope ratios." Quaternary Research 53(3): 277-283. Personal communication ... There he built the Quaternary Isotope Lab with a lead-lined room 30 feet below ground to shield the hand-built gas counters ... Their sub-annual resolution stable isotopes measurements provided confirmation of the rapid nature of major climatic changes at ...
https://en.wikipedia.org/wiki/Minze_Stuiver
Isotope analysisIsotope analysis
... as more energy is available for the evaporation of the heavier 18O isotope. The oxygen isotope record preserved in the ice ... 87Sr, 88Sr and oxygen isotope variations are different all over the world. These differences in isotopic ratio are then ... The main elements used in isotope ecology are carbon, nitrogen, oxygen, hydrogen and sulfur, but also include silicon, iron, ... In isotope hydrology, stable isotopes of water (2H and 18O) are used to estimate the source, age, and flow paths of water ...
https://en.wikipedia.org/wiki/Isotope_analysis
Gaia hypothesisGaia hypothesis
Karhu, J.A.; Holland, H.D. (1 October 1996). "Carbon isotopes and the rise of atmospheric oxygen". Geology. 24 (10): 867-870. ... Oxygen only began to persist in the atmosphere in small quantities about 50 million years before the start of the Great ... Oxygen is a reactive compound, and should eventually combine with gases and minerals of the Earth's atmosphere and crust. ... Traces of methane (at an amount of 100,000 tonnes produced per year) should not exist, as methane is combustible in an oxygen ...
https://en.wikipedia.org/wiki/Gaia_hypothesis
BerylBeryl
"Oxygen isotopes and emerald trade routes since antiquity". Science. 287 (5453): 631-633. Bibcode:2000Sci...287..631G. doi: ...
https://en.wikipedia.org/wiki/Beryl
Hollow MoonHollow Moon
October 2001). "Oxygen Isotopes and the Moon-Forming Giant Impact". Science. 294 (12): 345-348. Bibcode:2001Sci...294..345W. ... The stable-isotope ratios of lunar and terrestrial rock are identical, implying a common origin. Multiple lines of evidence ...
https://en.wikipedia.org/wiki/Hollow_Moon
Isotopic signatureIsotopic signature
Oxygen isotope ratio in atmosphere varies predictably with time of year and geographic location; e.g. there is a 2% difference ... Different oxygen isotopic signatures can indicate the origin of material ejected into space. The Moon's titanium isotope ratio ... The rate of exchange of surface isotopes with the environment has to be taken in account. The oxygen isotopic signatures of ... October 2001). "Oxygen Isotopes and the Moon-Forming Giant Impact". Science. 294 (12): 345-348. Bibcode:2001Sci...294..345W. ...
https://en.wikipedia.org/wiki/Isotopic_signature
Origin of the MoonOrigin of the Moon
However, this hypothesis does not adequately explain the essentially identical oxygen isotope ratios of the two bodies. This is ... Scott, Edward R. D. (December 3, 2001). "Oxygen Isotopes Give Clues to the Formation of Planets, Moons, and Asteroids". ... "Oxygen Isotopes and the Moon-Forming Giant Impact". Science. 294 (12): 345-348. Bibcode:2001Sci...294..345W. doi:10.1126/ ... The Moon's oxygen isotopic ratios seem to be essentially identical to Earth's. Oxygen isotopic ratios, which may be measured ...
https://en.wikipedia.org/wiki/Origin_of_the_Moon
Giant-impact hypothesisGiant-impact hypothesis
October 2001). "Oxygen Isotopes and the Moon-Forming Giant Impact". Science. 294 (12): 345-348. Bibcode:2001Sci...294..345W. ... Scott, Edward R. D. (December 3, 2001). "Oxygen Isotopes Give Clues to the Formation of Planets, Moons, and Asteroids". ... The Moon's oxygen isotopic ratios are essentially identical to those of Earth. Oxygen isotopic ratios, which may be measured ... which show oxygen isotope ratios nearly identical to those of Earth. The highly anorthositic composition of the lunar crust, as ...
https://en.wikipedia.org/wiki/Giant-impact_hypothesis
Global meteoric water lineGlobal meteoric water line
As oxygen isotopes (18O and 16O) and hydrogen isotopes (2H and 1H) have different masses, they behave differently in the ... describes the global annual average relationship between hydrogen and oxygen isotope (Oxygen-18 and Deuterium) ratios in ... Gat, J. R. (1996). "Oxygen and hydrogen isotopes in the hydrologic cycle". Annual Review of Earth and Planetary Sciences. 24 (1 ... The relationship of δ18O and δ2H in meteoric water is caused by mass dependent fractionation of oxygen and hydrogen isotopes ...
https://en.wikipedia.org/wiki/Global_meteoric_water_line
Satellite system (astronomy)Satellite system (astronomy)
"Oxygen Isotopes and the Moon-Forming Giant Impact". Science. 294 (12): 345-348. Bibcode:2001Sci...294..345W. doi:10.1126/ ... A torus of oxygen and hydrogen produced by Saturn's moon, Enceladus forms part of the E ring around Saturn. Nitrogen gas ... The Io plasma torus is a transfer of oxygen and sulfur from the tenuous atmosphere of Jupiter's volcanic moon, Io and other ... In the case of the latter, however, virtually identical isotope ratios found in samples of the Earth and Moon cannot be ...
https://en.wikipedia.org/wiki/Satellite_system_(astronomy)
Groundwater rechargeGroundwater recharge
Gat, J. R. (May 1996). "Oxygen and Hydrogen Isotopes in the Hydrologic Cycle". Annual Review of Earth and Planetary Sciences. ... Jasechko, Scott (September 2019). "Global Isotope Hydrogeology―Review". Reviews of Geophysics. 57 (3): 835-965. Bibcode: ...
https://en.wikipedia.org/wiki/Groundwater_recharge
TyrannosauridaeTyrannosauridae
Evidence from Oxygen Isotopes". Science. New York City. 265 (5169): 222-224. Bibcode:1994Sci...265..222B. doi:10.1126/science. ...
https://en.wikipedia.org/wiki/Tyrannosauridae
Oxygen-17Oxygen-17
Isotope content page, Environmental isotopes, Isotopes of oxygen). ... Oxygen-17 (17O) is a low-abundance, natural, stable isotope of oxygen (0.0373% in seawater; approximately twice as abundant as ... "Biological oxygen productivity during the last 60,000 years from triple oxygen isotope measurements". Global Biogeochemical ... Giauque, W. F.; Johnston, H. L. (1929). "An Isotope of Oxygen, Mass 17, in the Earth's Atmosphere". J. Am. Chem. Soc. 51 (12): ...
https://en.wikipedia.org/wiki/Oxygen-17
Prostaglandin-endoperoxide synthase 2Prostaglandin-endoperoxide synthase 2
Spin trapping and oxygen uptake studies". J. Biol. Chem. 255 (11): 5019-22. doi:10.1016/S0021-9258(19)70741-8. PMID 6246094. ... This is not consistent with the results of the isotope experiments of arachidonic acid oxygenation. PTGS2 (COX-2) exists as a ... First, hydrogen is abstracted from carbon 13 of arachidonic acid, and then two molecules of oxygen are added by the PTGS2 (COX- ... a significant kinetic isotope effect is observed for the abstraction of the 13-pro (S )-hydrogen; 2) carbon-centered radicals ...
https://en.wikipedia.org/wiki/Prostaglandin-endoperoxide_synthase_2
JosephoartigasiaJosephoartigasia
It prevents the seeds from getting oxygen and germinating. Rinderknecht, A.; Blanco, R. E. (January 2008). "The largest fossil ... Carbon isotope analyses of the enamel of giant fossil rodents, including J. monesi, report that they ate only C3 plants, such ...
https://en.wikipedia.org/wiki/Josephoartigasia
AbietaneAbietane
In particular, the reducing conditions of diagenesis are believed to cause abietanes to lose oxygen-containing functional ... Diefendorf, Aaron F.; Freeman, Katherine H.; Wing, Scott L. (2012-05-15). "Distribution and carbon isotope patterns of ... where they reveal a carbon isotope excursion during the Paleocene-Eocene Thermal Maximum (PETM). Abietanes found in marine ... "The Paleocene-Eocene carbon isotope excursion in higher plant organic matter: Differential fractionation of angiosperms and ...
https://en.wikipedia.org/wiki/Abietane
NeodymiumNeodymium
... isotopes. Four of the five stable isotopes have been predicted to decay to isotopes of cerium or samarium and are only ... meaning that it is generally found combined with oxygen. Although it belongs to the rare-earth metals, neodymium is not rare at ... some observationally stable isotopes of samarium are predicted to decay to isotopes of neodymium. Neodymium isotopes are used ... Several neodymium isotopes have been used for the production of other promethium isotopes. The decay from 147Sm (t1/2 = 1.06 × ...
https://en.wikipedia.org/wiki/Neodymium
MegadroughtMegadrought
Using the relationship between tropical Pacific sea surface temperatures and the oxygen isotope ratio in living corals to ...
https://en.wikipedia.org/wiki/Megadrought
Fractional crystallization (geology)Fractional crystallization (geology)
Addition and loss of water, carbon dioxide, and oxygen are among the compositional changes that must be considered. For example ... Isotope Geoscience Section. 86 (4): 323-333. doi:10.1016/0168-9622(91)90014-N. (CS1: long volume value, Articles with short ... The crystallization sequence of oxide minerals such as magnetite and ulvospinel is sensitive to the oxygen fugacity of melts, ...
https://en.wikipedia.org/wiki/Fractional_crystallization_(geology)
Amount of substanceAmount of substance
... a sample of 1 mol of molecules of oxygen (O 2) has a mass of about 32 grams, whereas a sample of 1 mol of atoms of oxygen (O) ... 1913: Discovery of isotopes of non-radioactive elements by Soddy and Thomson. 1914: Richards receives the Nobel Prize in ... Richter also notes that, for a given acid, the equivalent mass of the acid is proportional to the mass of oxygen in the base. ... Historically, the mole was defined as the amount of substance in 12 grams of the carbon-12 isotope. As a consequence, the mass ...
https://en.wikipedia.org/wiki/Amount_of_substance
Varanger PeninsulaVaranger Peninsula
"Linking paleocontinents through triple oxygen isotope anomalies". Geology. 46 (2): 179-182. doi:10.1130/g39470.1. ISSN 0091- ... Stable carbon isotope ratio chemostratigraphy has been used to correlate the Annijokka Member of the Båtsfjord Formation with ... during the Bitter Springs carbon isotope excursion. Strata deposited on the SW half of the Varanger Peninsula mostly formed ...
https://en.wikipedia.org/wiki/Varanger_Peninsula
PaleolithicPaleolithic
The formation of an Arctic ice cap around 3 million years ago is signaled by an abrupt shift in oxygen isotope ratios and ice- ... In February 2019, scientists reported evidence, based on isotope studies, that at least some Neanderthals may have eaten meat. ... Yika, Bob (19 February 2019). "Isotopes found in bones suggest Neanderthals were fresh meat eaters". Phys.org. Retrieved 20 ... Isotope analyses performed on single amino acids in Neanderthals' collagen samples shed new light on their debated diet". ...
https://en.wikipedia.org/wiki/Paleolithic
Noble gas compoundNoble gas compound
All known oganesson isotopes have even shorter half-lives in the millisecond range and no compounds are known yet, although ... KrF2 reacts with B(OTeF5)3 to produces the unstable compound, Kr(OTeF5)2, with a krypton-oxygen bond. A krypton-nitrogen bond ... In 1933, Linus Pauling predicted that the heavier noble gases would be able to form compounds with fluorine and oxygen. ... radioactive isotopes of krypton and xenon are difficult to store and dispose, and compounds of these elements may be more ...
https://en.wikipedia.org/wiki/Noble_gas_compound
Tautavel ManTautavel Man
... and span oxygen isotope stages 14-10 (roughly 550-400 thousand years ago). They are made of sand and aeolian sandy loam, ...
https://en.wikipedia.org/wiki/Tautavel_Man
Ralph LandauRalph Landau
Through a process called gaseous diffusion, isotopes of U-235 were separated from the predominant isotope, Uranium-238 by ... In the new process, hydroperoxides serve as a source of oxygen atoms, which are transferred to the olefin by metal catalysts. ... At the time, oxidation processes tended to use expensive oxidants such as nitric acid, chlorine, and pure oxygen. Landau saw ... proved highly effective when used with acetic acid as the solvent medium and oxygen from compressed air as the oxidant. ...
https://en.wikipedia.org/wiki/Ralph_Landau
Kinetic theory of gasesKinetic theory of gases
... such as diatomic oxygen) may act as if they have only 5 due to the strongly quantum-mechanical nature of their vibrations and ... which is useful in applications such as the gaseous diffusion method for isotope separation. Assume that in the container, the ...
https://en.wikipedia.org/wiki/Kinetic_theory_of_gases
Aqueous homogeneous reactorAqueous homogeneous reactor
More than 6 million people are examined with this isotope each year in Europe. The ability to extract medical isotopes directly ... The name was appropriate because in the higher power versions the fuel solution appeared to boil as hydrogen and oxygen bubbles ... Among the radioactive medical isotopes, Mo-99 and Sr-89 are widespread. The first one is a raw material for production of ... An analysis of the isotopes produced, performed at the National Institute of Radioactive Elements in Belgium, has shown that ...
https://en.wikipedia.org/wiki/Aqueous_homogeneous_reactor
Late Devonian extinctionLate Devonian extinction
The shape of conodonts' feeding apparatus varied with the oxygen isotope ratio, and thus with the sea water temperature; this ... Ward, P.; Labandeira, C.; Laurin, M; Berner, R (2006). "Confirmation of Romer's Gap as a low oxygen interval constraining the ... The extinction events were accompanied by widespread oceanic anoxia; that is, a lack of oxygen, prohibiting decay and allowing ... organic material formed at the surface can sink at such a rate that decomposing organisms use up all available oxygen by ...
https://en.wikipedia.org/wiki/Late_Devonian_extinction
Nuclear thermal rocketNuclear thermal rocket
In 1987, Ronen & Leibson published a study on applications of 242mAm (one of the isotopes of americium) as nuclear fuel to ... which is about twice that of liquid hydrogen-oxygen designs such as the Space Shuttle main engine. Other propellants have also ... about 10x the next highest cross section across all known isotopes. The 242mAm is fissile (because it has an odd number of ...
https://en.wikipedia.org/wiki/Nuclear_thermal_rocket
High-entropy alloyHigh-entropy alloy
In 2018, new types of HEAs based on the careful placement of ordered oxygen complexes, a type of ordered interstitial complexes ... was of specific interest to the medical industry because Tc-99m is an important medical imaging isotope. There is no ... "Enhanced strength and ductility in a high-entropy alloy via ordered oxygen complexes". Phys.org. Bała, Piotr; Górecki, Kamil; ... and oxygen also can affect the values of hardness and elastic modulus. Therefore, they still delve into the correlation between ...
https://en.wikipedia.org/wiki/High-entropy_alloy
Crassula aequilateraCrassula aequilatera
1853) 21: 14-17 Beu A.G. (2004) Marine Mollusca of oxygen isotope stages of the last 2 million years in New Zealand. Part 1: ...
https://en.wikipedia.org/wiki/Crassula_aequilatera
Mayo HospitalMayo Hospital
Intensive care (ICU) & coronary care unit (CCU), fully equipped with central monitoring, central oxygen supply system, ... young and old patients Radio Isotope Thyroid, Liver, Bone, Brain and other organs scanning, Hormonal Assays and Viral Markings ... with Central Oxygen and Suction System Standard Coronary Care Unit (CCU) Facilities Angiography, Angioplasty, Cardiac Bypass, ... Heart Valves Replacement and all sorts of Cardiac Operations and procedures Radio Isotope Cardiology, Thallium Scan, ...
https://en.wikipedia.org/wiki/Mayo_Hospital
Relative atomic massRelative atomic mass
... used either the oxygen-16 relative isotopic mass or else the oxygen relative atomic mass (i.e., atomic weight) for reference. ... Silicon exists in nature as a mixture of three isotopes: 28Si, 29Si and 30Si. The atomic masses of these nuclides are known to ... An example for three silicon isotopes is given below. The relative isotopic mass is specifically the ratio of the mass of a ... However, the range of natural abundance for the isotopes is such that the standard abundance can only be given to about ±0.001 ...
https://en.wikipedia.org/wiki/Relative_atomic_mass
Hydraulic redistributionHydraulic redistribution
Similarly, under extremely wet conditions when lateral roots are inundated by flood waters, oxygen deprivation will also lead ... Traditional methods of observating hydraulic redistribution include Deuterium isotope traces, sap flow, and soil moisture. In ...
https://en.wikipedia.org/wiki/Hydraulic_redistribution
ZirconZircon
Mojzsis, Stephen J.; Harrison, T. Mark; Pidgeon, Robert T. (2001). "Oxygen-isotope evidence from ancient zircons for liquid ... In addition, the oxygen isotopic compositions of some of these zircons have been interpreted to indicate that more than 4.4 ... with the large zirconium ions in eightfold coordination with oxygen ions. Zircon is mainly consumed as an opacifier, and has ... to image the zonation pattern and identify regions of interest for isotope analysis. This is done using an integrated ...
https://en.wikipedia.org/wiki/Zircon
Δ18OΔ18O
... groups which may preserve the oxygen isotope ratios of environmental water. Fractionation of oxygen isotopes in these tissues ... δ13C δ15N δ34S Isotopic signature Isotope analysis Isotope geochemistry Paleothermometer Stable isotope ratio "USGS - Isotope ... Luz, Boaz (1989). ""Oxygen isotope variation in bone phosphate."" (PDF). Applied Geochemistry. 4: 317-323. Clark, I.D. & Fritz ... Tsang, Man-Yin; Yao, Weiqi; Tse, Kevin (2020). Kim, Il-Nam (ed.). "Oxidized silver cups can skew oxygen isotope results of ...
https://en.wikipedia.org/wiki/Δ18O
AdasaurusAdasaurus
Owocki, K.; Kremer, B.; Cotte, M.; Bocherens, H. (2020). "Diet preferences and climate inferred from oxygen and carbon isotopes ...
https://en.wikipedia.org/wiki/Adasaurus
Ultra-high-temperature ceramicsUltra-high-temperature ceramics
Boron acts as a "burnable" neutron absorber because its two isotopes, 10B and 11B, both transmute into stable nuclear reaction ... which limits the pathways for oxygen to diffuse into the material and react. Although addition of additives such as SiC can ... The synthesized powders exhibit 200 nm crystallite size and low oxygen content (~ 1.0 wt%). UHTC preparation from polymeric ...
https://en.wikipedia.org/wiki/Ultra-high-temperature_ceramics
United States Anti-Doping AgencyUnited States Anti-Doping Agency
USADA supported research in a variety of areas, including anabolic steroids, growth hormone, oxygen transport-enhancing ... substances, genetic doping, ethics, and Isotope Ratio Mass Spectrometry. Since 2009, the majority of anti-doping research ...
https://en.wikipedia.org/wiki/United_States_Anti-Doping_Agency
Di-deuterated linoleic acid ethyl esterDi-deuterated linoleic acid ethyl ester
But when taken up, it is converted into 13,13-d2-arachidonic acid, a heavy isotope version of arachidonic acid, that gets ... It improved peak workload and peak oxygen consumption in the test group compared to the control group who received the equal ... The deuterated compound resists the non-enzymatic lipid peroxidation (LPO) through isotope effect - a non-antioxidant based ... August 2012). "Small amounts of isotope-reinforced polyunsaturated fatty acids suppress lipid autoxidation". Free Radical ...
https://en.wikipedia.org/wiki/Di-deuterated_linoleic_acid_ethyl_ester
Actinide chemistryActinide chemistry
... it was thought that this was a new radium isotope, as it was then standard radiochemical practice to use a barium sulfate ... this plutonyl core readily complexes with carbonate as well as other oxygen moieties (OH−, NO− 2, NO− 3, and SO2− 4) to form ...
https://en.wikipedia.org/wiki/Actinide_chemistry
Ene reactionEne reaction
CH-O hydrogen bonding occurs to the stereoelectronically most favorable oxygen lone pair of the BINOL ligand. In such a ... MINDO/3 calculations of activation parameters and primary kinetic isotope effects". Journal of the American Chemical Society. ... Since a Lewis acid can directly complex to a carbonyl oxygen, numerous trialkylaluminum catalysts have been developed for ...
https://en.wikipedia.org/wiki/Ene_reaction
Malcolm DoleMalcolm Dole
The Dole effect is the inequality in the ratio of heavy oxygen isotope 18O to the more abundant 16O in the earth's atmosphere ... Morita, N. (1935). "The increased density of air oxygen relative to water oxygen". J. Chem. Soc. Japan. 56: 1291. Dole M, Mack ... The effect is due to slightly different reaction rates for the two isotopes in respiration in plants and in animals which tends ... ISBN 0-533-07995-0. Dole, M. (1935). "The relative atomic weight of oxygen in water and air". J. Am. Chem. Soc. 57 (12): 2731. ...
https://en.wikipedia.org/wiki/Malcolm_Dole
Oxygen Isotope PlotsOxygen Isotope Plots
Oxygen isotope composition of primitive achondrites (SNCs shown for comparison). Data for brachinites, winonaites, acapulcoite- ... Clayton R. N. and Mayeda T. K. (1999) Oxygen isotope studies of carbonaceous chondrites. Geochim. Cosmochim. Acta 63, 2089-2017 ... Clayton R. N. and Mayeda T. K. (1999) Oxygen isotope studies of carbonaceous chondrites. Geochim. Cosmochim. Acta 63, 2089-2017 ... Greenwood R.C., Franchi I.A., Gibson J.M. and Benedix G.K. (2012) Oxygen isotope variation in primitive achondrites: The ...
https://www.lpi.usra.edu/meteor/drawplot.php?x=3.5700&y=1.6500&z=&plot=8&label=EET%2099402%20
Isotope data for oxygen-16 in the Periodic TableIsotope data for oxygen-16 in the Periodic Table
Detailed decay information for the isotope oxygen-16 including decay chains and daughter products. ... Oxygen Pictures Page. Al. Si. P. S. Cl. Ar. K. Ca. Oxygen Technical Data. Sc. Ti. V. Cr. Mn. Fe. Co. Ni. Cu. Zn. Ga. Ge. As. Se ... Isotopes of Oxygen (click to see decay chain):. 12O 13O 14O 15O 16O 17O 18O 19O 20O 21O 22O 23O 24O 25O 26O 27O 28O ... This isotope is stable and thus has no decay products, so instead we show decay chains that lead down to it. Atomic Weight. ...
https://www.periodictable.com/Isotopes/008.16/index2.p.dm.html
Isotope data for oxygen-27 in the Periodic TableIsotope data for oxygen-27 in the Periodic Table
Detailed decay information for the isotope oxygen-27 including decay chains and daughter products. ... Oxygen Pictures Page. Al. Si. P. S. Cl. Ar. K. Ca. Oxygen Technical Data. Sc. Ti. V. Cr. Mn. Fe. Co. Ni. Cu. Zn. Ga. Ge. As. Se ... Isotopes of Oxygen (click to see decay chain):. 12O 13O 14O 15O 16O 17O 18O 19O 20O 21O 22O 23O 24O 25O 26O 27O 28O ... Click any isotope in diagram to see its data.. Decay chain image generated by Mathematicas GraphPlot and IsotopeData functions ...
https://periodictable.com/Isotopes/008.27/index2.full.wt.html
Oxygen isotopes and sampling of the solar system - Open Research OnlineOxygen isotopes and sampling of the solar system - Open Research Online
Oxygen isotopes and sampling of the solar system.. Space Science Reviews, 216(2), article no. 25. ... Measurement of three oxygen isotopes throughout the solar system would further our concepts for formation of other solar ... But other tests based on oxygen isotopes within the solar system require either remote analysis or sample return missions. ... the scientific benefits are immense both in oxygen isotope characterisation, and in a variety of other geochemical analyses. ...
http://oro.open.ac.uk/70927/
The application of an oxygen isotope aridity index to terrestrial paleoenvironmental reconstructions in Pleistocene North...The application of an oxygen isotope aridity index to terrestrial paleoenvironmental reconstructions in Pleistocene North...
We have further developed an oxygen isotope aridity index and used oxygen (δ18O) isotope values and carbon (δ13C) isotope ... The application of an oxygen isotope aridity index to terrestrial paleoenvironmental reconstructions in Pleistocene North ... "The application of an oxygen isotope aridity index to terrestrial paleoenvironmental reconstructions in Pleistocene North ... "The application of an oxygen isotope aridity index to terrestrial paleoenvironmental reconstructions in Pleistocene North ...
https://bioone.org/journals/paleobiology/volume-39/issue-4/12059/The-application-of-an-oxygen-isotope-aridity-index-to-terrestrial/10.1666/12059.short
Strong oxygen-isotope effect on the intrinsic resistivity in the ferromagnetic state of manganites - NASA/ADSStrong oxygen-isotope effect on the intrinsic resistivity in the ferromagnetic state of manganites - NASA/ADS
The absolute magnitudes of the coefficient A and the phonon energy ħω,SUB,s,/SUB, for both isotope samples are in quantitative ... Oxygen-isotope effects on the intrinsic resistivity have been studied in high-quality epitaxial thin films of La,SUB,0.75,/SUB, ... Strong oxygen-isotope effect on the intrinsic resistivity in the ferromagnetic state of manganites *Zhao, Guo-Meng ... Oxygen-isotope effects on the intrinsic resistivity have been studied in high-quality epitaxial thin films of La0.75Ca0.25MnO3 ...
https://ui.adsabs.harvard.edu/abs/2001PhRvB..63f0402Z/abstract
ACPD - Diagnosing the stratospheric proportion in tropospheric ozone using triple oxygen isotopes as tracersACPD - Diagnosing the stratospheric proportion in tropospheric ozone using triple oxygen isotopes as tracers
A triple oxygen isotope perspective on the reaction dynamics and atmospheric implications for the transfer of the ozone isotope ... Diagnosing the stratospheric proportion in tropospheric ozone using triple oxygen isotopes as tracers Hao Xu1, Urumu Tsunogai. ... reports seasonal variations in triple oxygen isotopes of tropospheric ozone for two sites in Japan, and quantified the ... Diagnosing the stratospheric proportion in tropospheric ozone using triple oxygen isotopes as tracers, Atmos. Chem. Phys. ...
https://acp.copernicus.org/preprints/acp-2021-1099/
Data for: Oxygen isotopes in titanite and apatite, and their potential for crustal evolution research - Mendeley DataData for: Oxygen isotopes in titanite and apatite, and their potential for crustal evolution research - Mendeley Data
Details of the different sessions and standards are available in Appendix A.2. Appendix A.2. Oxygen isotopes data (raw and ... Table 2 Compilation of oxygen data aquire for the different studied samples. δ 18Ocorr values are δ 18O corrected from the ... Data for: Oxygen isotopes in titanite and apatite, and their potential for crustal evolution research. Published:. 24 March ... Details of the different sessions and standards are available in Appendix A.2. Appendix A.2. Oxygen isotopes data (raw and ...
https://data.mendeley.com/datasets/2s4dpccvhr
Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachi by Jordan N. Siewnarine"Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachi" by Jordan N. Siewnarine
Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Québec, Ontario, and Nunavut, and ... Siewnarine, Jordan N., "Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Québec, Ontario, and ... Their calcitic shells lock in the C and O isotope ratios of the seawater in which they live. The isotopic values of fossil ... The results of this study revealed that, during the early Silurian, stable O isotope values of contemporaneous shells did not ...
https://ir.lib.uwo.ca/etd/8605/
Oxygen Isotope Microanalysis By Secondary Ion Mass Spectrometry Suggests Continuous 300-million-year History of Calcite...Oxygen Isotope Microanalysis By Secondary Ion Mass Spectrometry Suggests Continuous 300-million-year History of Calcite...
Mark W. Brodie, Andrew C. Aplin, Bruce Hart, Ian J. Orland, John W. Valley, Adrian J. Boyce; Oxygen Isotope Microanalysis By ... Oxygen Isotope Microanalysis By Secondary Ion Mass Spectrometry Suggests Continuous 300-million-year History of Calcite ... In this study we have used 10-micrometer-resolution, in situ secondary ion mass spectrometry to determine the oxygen isotope ... Present-day formation waters in Devonian rocks in this region have oxygen isotope compositions of 7-8‰ VSMOW. Using these ...
https://pubs.geoscienceworld.org/sepm/jsedres/article-abstract/88/1/91/526249/Oxygen-Isotope-Microanalysis-By-Secondary-Ion-Mass?redirectedFrom=fulltext
Grootes, PM; Stuiver, M (1999): GISP2 Oxygen Isotope Data (1 year averages)Grootes, PM; Stuiver, M (1999): GISP2 Oxygen Isotope Data (1 year averages)
GISP2 Oxygen Isotope Data (1 year averages). PANGAEA, https://doi.org/10.1594/PANGAEA.55532 ... Isotope ratio mass spectrometry. mean d18O data, std dev = 0.14 per mil; 0.05-0.1 per mil for multiple measurement. ... Grootes, Pieter Meiert; Stuiver, Minze (1999): GISP2 Oxygen Isotope Data (1 year averages). PANGAEA, https://doi.org/10.1594/ ... Grootes, Pieter Meiert; Stuiver, Minze (1997): Oxygen 18/16 variability in Greenland snow and ice with 10-3- to 10-5-year time ...
https://doi.pangaea.de/10.1594/PANGAEA.55532
Metallogenic and tectonic significance of oxygen isotope data and whole-rock potassium-argon ages of the Nikolai Greenstone,...Metallogenic and tectonic significance of oxygen isotope data and whole-rock potassium-argon ages of the Nikolai Greenstone,...
Oxygen isotope data from quartz and epidote from three copperbearing veins yield calculated ore fluid temperatures of ... Oxygen isotope data from quartz and epidote from three copperbearing veins yield calculated ore fluid temperatures of ... Metallogenic and tectonic significance of oxygen isotope data and whole-rock potassium-argon ages of the Nikolai Greenstone, ... Metallogenic and tectonic significance of oxygen isotope data and whole-rock potassium-argon ages of the Nikolai Greenstone, ...
https://pubs.er.usgs.gov/publication/ofr802019
Oxygen Isotopes in Authigenic Clay Minerals: Toward Building a Reliabl by Daniel Gebregiorgis, Daniel M. Deocampo et al."Oxygen Isotopes in Authigenic Clay Minerals: Toward Building a Reliabl" by Daniel Gebregiorgis, Daniel M. Deocampo et al.
We present the first quantitative reconstruction of salinity in paleolake Olduvai based on the oxygen‐isotope composition of ... 2020). Oxygen isotopes in authigenic clay minerals: Toward building a reliable salinity proxy. Geophysical Research Letters, 47 ... 2020). Oxygen isotopes in authigenic clay minerals: Toward building a reliable salinity proxy. Geophysical Research Letters, 47 ... We present the first quantitative reconstruction of salinity in paleolake Olduvai based on the oxygen‐isotope composition of ...
https://scholarworks.gsu.edu/geosciences_facpub/25/
isotopes of oxygen-16isotopes of oxygen-16
... isotopes of lead isotopes of nitrogen isotopes of oxygen isotopes of oxygen-16 isotopes of sulfur isotopes of uranium isotopes ... isotopes and ions isotopes baseball isotopes baseball abq isotopes definition isotopes examples isotopes of argon isotopes of ... of water isotopes of xenon panels4less particles list particles lyrics particles mod serums.com serums peru serumstat serums ...
https://www.fly-trap.org/tag/isotopes-of-oxygen-16/
Palaeotemperature reconstructions of the European permafrost zone during marine oxygen isotope Stage 3 compared with climate...
Palaeotemperature reconstructions of the European permafrost zone during marine oxygen isotope Stage 3 compared with climate ... Palaeotemperature reconstructions of the European permafrost zone during marine oxygen isotope Stage 3 compared with climate ... title = "Palaeotemperature reconstructions of the European permafrost zone during marine oxygen isotope Stage 3 compared with ... Palaeotemperature reconstructions of the European permafrost zone during marine oxygen isotope Stage 3 compared with climate ...
https://pennstate.pure.elsevier.com/en/publications/palaeotemperature-reconstructions-of-the-european-permafrost-zone
Controls on ostracod valve geochemistry: Part 2. Carbon and oxygen isotope compositions | Archive ouverte UNIGE
Controls on ostracod valve geochemistry: Part 2. Carbon and oxygen isotope compositions. In: Geochimica et cosmochimica acta, ... Controls on ostracod valve geochemistry: Part 2. Carbon and oxygen isotope compositions. ... Controls on ostracod valve geochemistry: Part 2. Carbon and oxygen isotope compositions ...
https://archive-ouverte.unige.ch/unige:26857
Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra...Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra...
Alternative indicators of annual rings, such as the oxygen (δ(18)Owc) and carbon stable isotope ratios of wood cellulose (δ(13) ... Alternative indicators of annual rings, such as the oxygen (δ(18)Owc) and carbon stable isotope ratios of wood cellulose (δ(13) ... Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra ... Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra ...
https://escholarship.org/uc/item/9nn2f1w6
EB26 phosphate oxygen isotopes - RSC ECGEB26 phosphate oxygen isotopes - RSC ECG
Phosphate oxygen isotopes - A new tool for nutrient sources and cycling. Daren C. Gooddy British Geological Survey. [email protected] ...
https://www.envchemgroup.com/eb26-phosphate-oxygen-isotopes.html
Data underlying the publication: Strontium, oxygen and carbon isotope variation in modern human dental enamel - TU Delft...
Data underlying the publication: Strontium, oxygen and carbon isotope variation in modern human dental enamel. *E. Plomp ( ... oxygen and carbon isotope variation in modern human dental enamel. TU Delft - 4TU.ResearchData. 10.4121/UUID:F6DC4F20-A6E0-4B2F ... This dataset contains the isotopic results (strontium, oxygen and carbon) of modern human third molars (numerical data ...
https://research.tudelft.nl/en/datasets/data-underlying-the-publication-strontium-oxygen-and-carbon-isoto
Oxygen isotope measurements via high temperature pyrolysis - ElementarOxygen isotope measurements via high temperature pyrolysis - Elementar
This Technical Note shows the excellent performance of Elementars EA-IRMS systems in oxygen mode by analyses of standards with ... Oxygen isotope measurements using high temperature pyrolysis For the determination of the oxygen stable isotope ratio of ... This Technical Note shows the excellent performance of our EA-IRMS systems in oxygen mode by analyses of different primary and ...
https://www.elementar.com/en-gb/applications/application-explorer/oxygen-isotope-measurements-using-high-temperature-pyrolysis
isotopes of oxygen - Separaseisotopes of oxygen - Separase
... of argon isotopes of copper isotopes of hydrogen isotopes of lead isotopes of nitrogen isotopes of oxygen isotopes of oxygen-16 ... of argon isotopes of copper isotopes of hydrogen isotopes of lead isotopes of nitrogen isotopes of oxygen isotopes of oxygen-16 ... rancho mirage gelsons thousand oaks gelsons weekly flyer isotopes baseball abq isotopes definition isotopes examples isotopes ... rancho mirage gelsons thousand oaks gelsons weekly flyer isotopes baseball abq isotopes definition isotopes examples isotopes ...
https://separase.com/tag/isotopes-of-oxygen/
isotopes of oxygen - Aria Neurosciencesisotopes of oxygen - Aria Neurosciences
Epithelial ovarian most cancers (EOC) is a deadly gynaecological neoplasm characterised by fast development and angiogenesis. Nerve development issue (NGF) and its excessive affinity receptor tropomyosin receptor kinase A (TRKA) contribute to EOC development by growing the expression of c-MYC, survivin and vascular endothelial development issue (VEGF) together with a lower in microRNAs (miR) 23b. Read More ...
https://www.arianeurosciences.com/tag/isotopes-of-oxygen/
Oxygen Isotopes | CU Experts | CU BoulderOxygen Isotopes | CU Experts | CU Boulder
Oxygen Isotopes PubMed MeSh Term *Overview. Overview. subject area of * Applying the dual-isotope conceptual model to interpret ... Oxygen isotope effects during microbial sulfate reduction: applications to sediment cell abundances Journal Article ... Triple oxygen isotope evidence for limited mid-Proterozoic primary productivity Journal Article ... Postimpact earliest Paleogene warming shown by fish debris oxygen isotopes (El Kef, Tunisia) Journal Article ...
https://experts.colorado.edu/display/meshid_D01.496.625
Tritium, hydrogen and oxygen isotope compositions in monthly precipitation samples collected at toki, Japan<...
Tritium, hydrogen and oxygen isotope compositions in monthly precipitation samples collected at toki, Japan」の研究トピックを掘り下げます。これらが ... Tritium, hydrogen and oxygen isotope compositions in monthly precipitation samples collected at toki, Japan. In: Radiation ... Tritium, hydrogen and oxygen isotope compositions in monthly precipitation samples collected at toki, Japan. / Akata, N.; ... Tritium, hydrogen and oxygen isotope compositions in monthly precipitation samples collected at toki, Japan. Radiation ...
https://kyushu-u.pure.elsevier.com/ja/publications/tritium-hydrogen-and-oxygen-isotope-compositions-in-monthly-preci
CRAN - Package ShellChronCRAN - Package ShellChron
ShellChron: Builds Chronologies from Oxygen Isotope Profiles in Shells. Takes as input a stable oxygen isotope (d18O) profile ...
https://stat.ethz.ch/CRAN/web/packages/ShellChron/index.html
isotopes of oxygen-16 - ChIP-Grade Antibodiesisotopes of oxygen-16 - ChIP-Grade Antibodies
... isotopes of lead isotopes of nitrogen isotopes of oxygen isotopes of oxygen-16 isotopes of rhenium isotopes of sulfur isotopes ... gelsyn-3 gelsyn injection isotopes and ions isotopes definition isotopes examples isotopes of argon isotopes of copper isotopes ... of uranium isotopes of water isotopes of xenon isotopes of ytterbium isotopes of zinc isotopes that decay slowly are used to ...
https://chipgrade.com/tag/isotopes-of-oxygen-16/
isotopes of oxygen - Mybioreagents Distributor of Raybiotech, Origeneisotopes of oxygen - Mybioreagents Distributor of Raybiotech, Origene
Modification normal pressure and high pressure phase of nitridosilicates tentative new engine (2) with M = Be, Mg, Ca or have been thoroughly studied by. ...
https://www.mybioreagent.com/tag/isotopes-of-oxygen/
isotopes of oxygen-16<...isotopes of oxygen-16<...
... isotopes of lead isotopes of nitrogen isotopes of oxygen isotopes of oxygen-16 isotopes of rhenium isotopes of sulfur isotopes ... isotopes of lead isotopes of nitrogen isotopes of oxygen isotopes of oxygen-16 isotopes of rhenium isotopes of sulfur isotopes ... isotopes and ions isotopes baseball isotopes baseball abq isotopes definition isotopes examples isotopes of argon isotopes of ... isotopes and ions isotopes baseball isotopes baseball abq isotopes definition isotopes examples isotopes of argon isotopes of ...
https://www.iddx.info/tag/isotopes-of-oxygen-16/
Pedogenic carbonate stable isotope record of environmental change during the Neogene in the southern Great Plains, southwest...Pedogenic carbonate stable isotope record of environmental change during the Neogene in the southern Great Plains, southwest...
We use the stable oxygen isotope composition (δ18O relative to Vienna standard mean ocean water [VSMOW]) of 194 paleosol ... We use the stable oxygen isotope composition (δ18O relative to Vienna standard mean ocean water [VSMOW]) of 194 paleosol ... We use the stable oxygen isotope composition (δ18O relative to Vienna standard mean ocean water [VSMOW]) of 194 paleosol ... We use the stable oxygen isotope composition (δ18O relative to Vienna standard mean ocean water [VSMOW]) of 194 paleosol ...
https://experts.umn.edu/en/publications/pedogenic-carbonate-stable-isotope-record-of-environmental-change
Oxygen isotope study on metagabbros from an high-pressure orogenic belt (Cyclades, Greece): implications for a pre-eclogitic...Oxygen isotope study on metagabbros from an high-pressure orogenic belt (Cyclades, Greece): implications for a pre-eclogitic...
Putlitz B, Matthews A, Valley J, Katzir Y, Avigad D. Oxygen isotope study on metagabbros from an high-pressure orogenic belt ( ... Oxygen isotope study on metagabbros from an high-pressure orogenic belt (Cyclades, Greece): implications for a pre-eclogitic ... Oxygen isotope study on metagabbros from an high-pressure orogenic belt (Cyclades, Greece) : implications for a pre-eclogitic ... title = "Oxygen isotope study on metagabbros from an high-pressure orogenic belt (Cyclades, Greece): implications for a pre- ...
https://cris.bgu.ac.il/en/publications/oxygen-isotope-study-on-metagabbros-from-an-high-pressure-orogeni
RatiosCompositionsCompositionStable oxygenVariabilityStrontiumMiddle MioceneSeawaterCarbonateDataMeasurementsTracersD18OContemporaneousAtomsShellsRatio1999Earth'sNitrogenVariationsVIVOAnalyses2016MoleculesTemperatureGeochemicalImplicationsMarine oxygenRadioactiveVariationDatasetMeasurementTraceInferValuesEffectsPredictionsEarthSolarAssessments
Ratios7
  • Their calcitic shells lock in the C and O isotope ratios of the seawater in which they live. (uwo.ca)
  • We provide theoretical estimates and a first set of measurements demonstrating that water of combustion is characterized by a distinctive combination of H and O isotope ratios. (oregonstate.edu)
  • Strontium and oxygen isotope ratios in three teeth from two individuals at El Hundido and two teeth from the five individuals at Valdescusa were studied. (bvsalud.org)
  • [1] [ irrelevant citation ] The Moon's oxygen isotopic ratios seem to be essentially identical to Earth's. (wikipedia.org)
  • [4] Oxygen isotopic ratios, which may be measured very precisely, yield a unique and distinct signature for each Solar System body. (wikipedia.org)
  • Studied samples display the d values from +22.68 to +24.91 CDT for sulphur (ten samples) and from +12.26 to +13.63 SMOW for oxygen (ten samples), and 87 Sr/86 Sr ratios from 0.708915 to 0.716329 (six samples). (gov.pl)
  • While sedimentary gypsum displays sulphur, oxygen and strontium isotope ratios close to contemporaneous (Badenian) seawater, diagenetic anhydrite values are largely elevated. (gov.pl)
Compositions6
  • Present-day formation waters in Devonian rocks in this region have oxygen isotope compositions of 7-8‰ VSMOW. (geoscienceworld.org)
  • In this report, selected data were analysed to identify the regional hydrogen and oxygen isotope compositions. (elsevier.com)
  • These regional hydrogen and oxygen isotope compositions will be used for environmental assessments of effects of the deuterium plasma experiments of the large fusion test device. (elsevier.com)
  • In particular, the merit of the increment method relative to the statistico-mechanics method is evident for crystalline minerals because it enables the systematic and accurate predictions of oxygen isotope fractionation factors for different structures and compositions of crystalline minerals based only on their crystal chemistry. (geochemical-journal.jp)
  • Sulphur, oxygen and strontium isotope compositions have been measured in sulphate (gypsum and anhydrite) samples from the Badenian evaporite complex in the Carpathian Foredeep Basin (Poland) to determine the origin of brines from which these sulphates were formed. (gov.pl)
  • Chondrule phenocrysts, like spinel, olivine, low-Ca pyroxene, and Ca pyroxene, were not affected by this isotope exchange and preserved their initial O-isotope compositions. (cosmochemistry-papers.com)
Composition9
  • Oxygen isotope composition of primitive achondrites (SNCs shown for comparison). (usra.edu)
  • Franchi I. A., Wright I. P., Sexton A. S. and Pillinger C. T. (1999) The oxygen-isotopic composition of Earth and Mars. (usra.edu)
  • In this study we have used 10-micrometer-resolution, in situ secondary ion mass spectrometry to determine the oxygen isotope composition of 197 individual, 10-50-micrometer-size crystals of dolomite and calcite from six samples in a single core of Upper Devonian middle Bakken Member siltstones and sandstones, the major tight oil formation of the Williston basin, USA. (geoscienceworld.org)
  • We present the first quantitative reconstruction of salinity in paleolake Olduvai based on the oxygen‐isotope composition of authigenic clay minerals. (gsu.edu)
  • We use the stable oxygen isotope composition (δ 18 O relative to Vienna standard mean ocean water [VSMOW]) of 194 paleosol carbonates from 19 measured sections to reconstruct the climatic conditions in the Meade Basin during the rise of C 4 grasses to ecological dominance in the region. (umn.edu)
  • The increase in δ 18 O values between the end of the middle Blancan and the beginning of the late Blancan-early Irvingtonian sections could reflect the onset of Northern Hemisphere glaciation and a change in the isotope composition of the hydrosphere due to increased ice volume. (umn.edu)
  • Biological P transformations were studied with the help of the isotopic composition of oxygen (O) in phosphate ( δ 18 O P ) coupled to sequential P fractionation performed on soil samples (0-5 cm depth) from four sites of different age spanning 0 to 100-150 years. (copernicus.org)
  • The stable oxygen isotope composition of Late Holocene syngenetic ice wedges from the Erkutayakha River valley in the Yamal Peninsula and from the Adventdalen valley in Svalbard was studied. (rgo.ru)
  • Plant litter composition and stable isotope signatures vary during decomposition in blue carbon ecosystems. (bluecarbonlab.org)
Stable oxygen4
  • Seasonal variations in the stable oxygen isotope ratio of wood cellulose reveal annual rings of trees in a Central Amazon terra firme forest. (escholarship.org)
  • Takes as input a stable oxygen isotope (d18O) profile measured in growth direction (D) through a shell + uncertainties in both variables (d18O_err & D_err). (ethz.ch)
  • Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. (bvsalud.org)
  • O-17 and 18 are stable oxygen isotopes. (bvsalud.org)
Variability2
  • Oxygen 18/16 variability in Greenland snow and ice with 10-3- to 10-5-year time resolution. (pangaea.de)
  • There is considerable potential to produce long and well-replicated oak tree ring stable isotope chronologies in Romania which would allow reconstructions of both regional drought and large-scale circulation variability over southern and central Europe. (swan.ac.uk)
Strontium4
  • This dataset contains the isotopic results (strontium, oxygen and carbon) of modern human third molars (numerical data underlying a publication). (tudelft.nl)
  • Strontium and oxygen isotopes to trace mobility routes during the Bell Beaker period in the north of Spain. (bvsalud.org)
  • Strontium and oxygen isotopes of individuals from El Hundido and Valdescusa (north of Spain ) sites, corresponding to the Bell Beaker culture , were analysed in order to determine mobility patterns and provenance areas. (bvsalud.org)
  • The comparison of oxygen and strontium isotope signatures indicate the west of the Iberian Peninsula (Zamora or the east of Leon regions) as the provenance area for the foreign individual at El Hundido and southwest France (Garonne basin) as the region of provenance for the Valdescusa. (bvsalud.org)
Middle Miocene1
  • For that reason, comparative stable carbon and oxygen isotope analyses of four coexisting planktic foraminifera species from National Gas Hydrate Program Expedition Site 01 (Site NGHP-01-01A) were performed in order to reconstruct the habitat depth of D. altispira in the eastern Arabian Sea for the middle Miocene (~16-12.5 Ma). (eudat.eu)
Seawater1
  • The isotope studies support a connate seawater source for the mineralizing fluids from both areas. (cdc.gov)
Carbonate4
  • Theoretical and experimental aspects of oxygen isotope fractionation in carbonate minerals are critically examined based on a direct comparison of fractionation factors for carbonate-water systems. (geochemical-journal.jp)
  • Nevertheless, complexity in oxygen isotope fractionations between calcite and the other carbonate minerals can be caused by the oxygen isotope inheritance during polymorphic transformation from aragonite to calcite and by the isotope salt effect on the other carbonates in the presence of aqueous fluids. (geochemical-journal.jp)
  • In the extreme case, equilibrium oxygen isotope fractionation factors for single carbonate-water systems could be either underestimated or overestimated by one of the theoretical and experimental methods. (geochemical-journal.jp)
  • Volcanic activity led to ocean acidification at the onset of Oceanic Anoxic Event 2, which then persisted for 600,000 years due to biogeochemical feedbacks, according to marine osmium isotope and carbonate sedimentation records offshore from southwest Australia. (nature.com)
Data9
  • Click any isotope in diagram to see its data. (periodictable.com)
  • Table 2 Compilation of oxygen data aquire for the different studied samples. (mendeley.com)
  • Oxygen isotopes data (raw and corrected) Appendix A.3. (mendeley.com)
  • and 3) the oxygen isotopic data were used to reconstruct sea water temperature and other paleoenvironmental factors. (uwo.ca)
  • Oxygen isotope data from quartz and epidote from three copperbearing veins yield calculated ore fluid temperatures of approximately 200°C and 6180 of approximately +1 per mil in agreement with a metamorphicsegregation origin of these deposits, as suggested by Sinclair (1977). (usgs.gov)
  • Neogene calc-alkaline magmatites (from basaltic andesites to rhyolites including mafic cognate enclaves) of the Rodna-Bârgău subvolcanic area (East Carpathian arc) are evaluated on the basis of new mineral compositional data, major and trace elements, as well as Sr and O isotope data. (geologicacarpathica.com)
  • However, paragenetic, fluid inclusion, and stable isotope data indicate major differences in the genetic history of the outlying occurrences. (cdc.gov)
  • Sulfur, carbon, and oxygen isotope data suggest that some outlying mineralization was more strongly influenced by local diagenetic processes than by processes that formed the main upper Mississippi Valley deposits. (cdc.gov)
  • Here, we obtain insight into these processes by acquiring O-isotope data from 17 Al-rich chondrules from unequilibrated ordinary chondrites (OCs, petrologic type ≤3.2) and four Al-rich chondrules from the CO3.1 carbonaceous chondrite Dar al Gani (DaG) 083. (cosmochemistry-papers.com)
Measurements5
  • Our findings suggest potential for water vapor isotope ratio measurements to be used in conjunction with other tracers to refine the apportionment of urban emissions, and imply that water vapor emissions associated with combustion may be a significant component of the water budget of the urban boundary layer, with potential implications for urban climate, ecohydrology, and photochemistry. (oregonstate.edu)
  • Thermoelectric power (S) and lattice parameter (Formula presented) b, (Formula presented) measurements are used to determine the change in the carrier concentration (n) in both isotope exchanged and oxygen deficient samples of (Formula presented) It is observed upon substitution of the (Formula presented) isotope for (Formula presented) that the Curie temperature (Formula presented) decreases but no significant changes in S at 290 K and a, b, or c are seen. (ncku.edu.tw)
  • The first measurements of a heavy oxygen isotope in Earth's upper atmosphere suggest that isotopic concentrations could become powerful probes of atmospheric processes at otherwise hard-to-probe altitudes. (aps.org)
  • This report discusses measurements on fluid inclusion homogenization temperatures, salinities, and sulfur isotopes. (cdc.gov)
  • Also when fossil fuels are burned oxygen is removed from the atmosphere and atmospheric oxygen measurements made at a world wide network of sites confirm that atmospheric oxygen has been decreasing in parallel with increasing atmospheric CO2. (lowenz.com)
Tracers1
  • Radium isotopes as tracers of shelf-derived trace elements inputs into the oceans. (sfb754.de)
D18O1
  • d18O measured at the Quaternary Isotope Laboratory, Univ of Washington. (pangaea.de)
Contemporaneous1
  • The results of this study revealed that, during the early Silurian, stable O isotope values of contemporaneous shells did not vary significantly from higher to lower tropics, whereas C isotopes varied significantly, due to increased ocean connectivity. (uwo.ca)
Atoms2
  • Atoms tend to combine with other atoms to form molecules (for example, hydrogen and oxygen combine to form water). (cdc.gov)
  • Both carbon and oxygen contain isotopes which are atoms with the same numbers of protons but different numbers of neutrons. (lowenz.com)
Shells2
  • Lisiecki analysed oxygen isotopes in the shells of fossilised marine organisms called foraminifera. (blogspot.com)
  • During glacial periods, the forams' shells contain more of the heavier of two oxygen isotopes, as the lighter one is preferentially accumulated in snow and ice rather than the ocean. (blogspot.com)
Ratio1
  • [6] Also, the Moon's titanium isotope ratio ( 50 Ti / 47 Ti ) appears so close to the Earth's (within 4 parts per million) that little if any of the colliding body's mass could likely have been part of the Moon. (wikipedia.org)
19991
  • Clayton R. N. and Mayeda T. K. (1999) Oxygen isotope studies of carbonaceous chondrites. (usra.edu)
Earth's2
  • Given that similar conditions were likely present throughout vast swathes of Earth's history, it is possible that Fe-AOM and vivianite authigenesis may have modulated methane and phosphorus availability on the early Earth, as well as during later periods of expanded marine oxygen deficiency. (copernicus.org)
  • Thirty years after oxygen isotope records from microfossils deposited in ocean sediments confirmed the hypothesis that variations in the Earth's orbital geometry control the ice. (ingv.it)
Nitrogen1
  • Moreover, Patent Document 3 describes a high purity ruthenium target containing 10 wtppm or less of oxygen, 10 wtppm or less of nitrogen, and having a purity of 5N level or higher. (justia.com)
Variations1
  • Based on the oxygen isotope variations is has been calculated that mean winter air temperatures did not change by more than 3oC during the Late Holocene. (rgo.ru)
VIVO1
  • To perform in vivo stable isotope substrate assays to determine rates of protein synthesis, lipogenesis, peripheral glucose disposal, hepatic glucose recycling, glucose-glycerol cycling and Cori cycling, high energy phosphate (ATP, creatine phosphate) turnover, and in vitro stable isotope flux dissections of metabolic pathways. (elsevier.com)
Analyses1
  • While sample return missions to either Venus or Mercury appear highly challenging, the scientific benefits are immense both in oxygen isotope characterisation, and in a variety of other geochemical analyses. (open.ac.uk)
20162
  • We present the first annual oxygen isotope record (1900 - 2016) from the latewood (LW) cellulose of oak trees (Quercus robur) from NW Romania. (swan.ac.uk)
  • The November 7, 2016 issue of Chemical & Engineering News featured this recent research as it interests chemists and engineers who are trying to find innovative ways to preserve unstable carbon-based molecules of life: "Although commonly found in moss and lichens, tardigrades are truly aquatic animals, requiring a film of water surrounding their body to take in oxygen and expel carbon dioxide. (grisda.org)
Molecules5
  • But water isn't water until hydrogen and oxygen combine, and the lighter hydrogen molecules in the cloud hop around on the frozen dust grains until they encounter oxygen. (universetoday.com)
  • CO2 molecules are made from the elements carbon and oxygen. (lowenz.com)
  • Because of this, the mass of each isotope is slightly different and this leads to CO2 molecules with different masses. (lowenz.com)
  • In general, UV-light and oxygen are constantly attacking these molecules and rearranging their structures into molecular configurations unsuitable for their original purpose. (grisda.org)
  • Eliminating water, oxygen, and energetic radiation (gamma, x-ray, UV, visible) can greatly extend and preserve organic molecules which is why some biomolecules can be preserved for longer periods of time when embedded in crystalline or amorphous solids like amber or stone. (grisda.org)
Temperature1
  • 2007. Response of photosynthetic apparatus to moderate high temperature in contrasting wheat cultivars at different oxygen concentrations . (hutton.ac.uk)
Geochemical1
  • Geochemical tools, including the analysis of stable isotopes from fossil mammals, are often used to infer regional climatic and environmental differences. (bioone.org)
Implications1
  • Siewnarine, Jordan N., "Stable Carbon and Oxygen Isotopes of Early Silurian Pentameride Brachiopods from Québec, Ontario, and Nunavut, and Paleoenvironmental Implications" (2022). (uwo.ca)
Marine oxygen1
  • A palaeotemperature reconstruction based on periglacial phenomena in Europe north of approximately 51 °N, is compared with high-resolution regional climate model simulations of the marine oxygen isotope Stage 3 (Stage 3) palaeoclimate. (elsevier.com)
Radioactive1
  • All isotopes of an element, even those that are radioactive, react chemically in the same way. (cdc.gov)
Variation1
  • Greenwood R.C., Franchi I.A., Gibson J.M. and Benedix G.K. (2012) Oxygen isotope variation in primitive achondrites: The influence of primordial, asteroidal and terrestrial processes. (usra.edu)
Dataset1
  • Dataset, Brief Description: Australian national gridded 10' resolution isoscape for long term annual average stable water isotopes in precipitation. (ansto.gov.au)
Measurement1
  • Measurement of three oxygen isotopes throughout the solar system would further our concepts for formation of other solar systems, and give us insight into the general mechanisms of planetary system formation and the role of water in the formation and evolution of the chondrite parent bodies and planets. (open.ac.uk)
Trace1
  • Benthic cycling of trace metals under low oxygen conditions. (sfb754.de)
Infer1
  • We infer that the chondrule glasses experienced O-isotope exchange with an aqueous fluid on the OC parent asteroids. (cosmochemistry-papers.com)
Values4
  • We have further developed an oxygen isotope aridity index and used oxygen (δ 18 O) isotope values and carbon (δ 13 C) isotope values to assess regional climatic differences between the southeastern and southwestern United States during the Pleistocene. (bioone.org)
  • The D. altispira oxygen isotope values are on average higher than those of the shallow water reference species Trilobatus sacculifer and Globigerinoides obliquus, but still significantly lower than those for the deeper dwelling species Dentoglobigerina venezuelana. (eudat.eu)
  • Precision fit for purpose of δ18O values (± 0.3‰, 1s) and oxygen yields (close to 100%) were obtained for U3O8 and UO2 where oxygen is only bound to uranium. (deepcarbon.net)
  • The lower δ 18 O values and the observed oxygen isotope disequilibrium between coexisting pyroxenes and amphiboles are explained by interaction with heated meteoric water. (geologicacarpathica.com)
Effects1
  • Oxygen-isotope effects on the intrinsic resistivity have been studied in high-quality epitaxial thin films of La 0.75 Ca 0.25 MnO 3 and Nd 0.7 Sr 0.3 MnO 3 . (harvard.edu)
Predictions1
  • The absolute magnitudes of the coefficient A and the phonon energy ħω s for both isotope samples are in quantitative agreement with theoretical predictions. (harvard.edu)
Earth2
  • [5] If Theia had been a separate protoplanet , it probably would have had a different oxygen isotopic signature than proto-Earth, as would the ejected mixed material. (wikipedia.org)
  • A 2012 study on the depletion of zinc isotopes on the Moon found evidence for volatile depletion consistent with the giant-impact origin for Earth and the Moon. (wikipedia.org)
Solar2
  • Young E. D. and Russell S. S. (1998) Oxygen reservoirs in the early solar nebula inferred from an Allende CAI. (usra.edu)
  • But other tests based on oxygen isotopes within the solar system require either remote analysis or sample return missions. (open.ac.uk)
Assessments1
  • 3. To perform assessments of glycolysis (extracellular acidification rates, glycolytic ATP production rates) and mitochondrial oxygen consumption (mitochondrial respiration and mitochondrial ATP production rates) in tissue explants, primary isolated and tissue culture cells using Seahorse Biosciences Flux Analyzers. (elsevier.com)
A new BGS platform to model volcanic ash in the atmosphere
A new BGS platform to model volcanic ash in the atmosphere (bgs.ac.uk)
Evolution and forcing mechanisms of El Niño over the past 21,000 years | Nature
Evolution and forcing mechanisms of El Niño over the past 21,000 years | Nature (nature.com)
Generative exploration
Generative exploration (alsglobal.com)
Hydrosphärische Tracer und Proxies (HydroTraP) | Institut für Umweltphysik
Hydrosphärische Tracer und Proxies (HydroTraP) | Institut für Umweltphysik (iup.uni-heidelberg.de)
Origin of the Moon - Wikipedia
Origin of the Moon - Wikipedia (en.wikipedia.org)
Earth's Water is 4.5 Billion Years Old - Universe Today
Earth's Water is 4.5 Billion Years Old - Universe Today (universetoday.com)
New spinosaurids from the Wessex Formation (Early Cretaceous, UK) and the European origins of Spinosauridae | Scientific Reports
New spinosaurids from the Wessex Formation (Early Cretaceous, UK) and the European origins of Spinosauridae | Scientific Reports (nature.com)
(coursera.org)
Mitarbeiter | Max Planck Institut für Sonnensystemforschung
Mitarbeiter | Max Planck Institut für Sonnensystemforschung (mps.mpg.de)
The hydrochemistry of groundwater in the Densu River Basin, Ghana | Request PDF
The hydrochemistry of groundwater in the Densu River Basin, Ghana | Request PDF (researchgate.net)
PDF] Carbon and oxygen isotopic ratios in Arcturus and Aldebaran - Constraining the parameters for non-convective mixing on the...
PDF] Carbon and oxygen isotopic ratios in Arcturus and Aldebaran - Constraining the parameters for non-convective mixing on the... (semanticscholar.org)
Minerals | Free Full-Text | Micro-Raman-A Tool for the Heavy Mineral Analysis of Gold Placer-Type Deposits (Pianu Valley,...
Minerals | Free Full-Text | Micro-Raman-A Tool for the Heavy Mineral Analysis of Gold Placer-Type Deposits (Pianu Valley,... (mdpi.com)
Emergence of modern continental crust about 3 billion years ago | Nature Geoscience
Emergence of modern continental crust about 3 billion years ago | Nature Geoscience (nature.com)
Grootes, PM; Stuiver, M (1999): GISP2 Oxygen Isotope Data (1 year averages)
Grootes, PM; Stuiver, M (1999): GISP2 Oxygen Isotope Data (1 year averages) (doi.pangaea.de)
Farewell Column by Anjali Tsui | Breathing room | The Daily Pennsylvanian
Farewell Column by Anjali Tsui | Breathing room | The Daily Pennsylvanian (thedp.com)
Two Global Undergraduate Awards to ASE - Zhang Yilin Global Winner and Sun Huiwen Highly Commended Entrant | The Asian School...
Two Global Undergraduate Awards to ASE - Zhang Yilin Global Winner and Sun Huiwen Highly Commended Entrant | The Asian School... (ntu.edu.sg)
Evidence for extremely rapid magma ocean crystallization and crust formation on Mars | Nature
Evidence for extremely rapid magma ocean crystallization and crust formation on Mars | Nature (nature.com)
Plants | Free Full-Text | Metabolomic Profiling in Combination with Data Association Analysis Provide Insights about Potential...
Plants | Free Full-Text | Metabolomic Profiling in Combination with Data Association Analysis Provide Insights about Potential... (mdpi.com)
Isotopes of oxygen-16
Isotopes of oxygen-16 (fly-trap.org)
How to tell biological from non-biological molecules | The Economist
How to tell biological from non-biological molecules | The Economist (economist.com)
Still Trying to Make Ice Cores Old | Answers in Genesis
Still Trying to Make Ice Cores Old | Answers in Genesis (answersingenesis.org)
Shamus, Timothy - Rutgers University :: Department of Earth and Planetary Sciences
Shamus, Timothy - Rutgers University :: Department of Earth and Planetary Sciences (geology.rutgers.edu)
Stalagmites & Hieroglyphs: Investigating the Maya Demise | Live Science
Stalagmites & Hieroglyphs: Investigating the Maya Demise | Live Science (livescience.com)
Physics - How Nature's Donuts Get Their Wrinkles
Physics - How Nature's Donuts Get Their Wrinkles (physics.aps.org)
Pubs.GISS: GISS Publications: Publications by Gavin A. Schmidt
Pubs.GISS: GISS Publications: Publications by Gavin A. Schmidt (pubs.giss.nasa.gov)
Osíxeno - Wikipedia, a enciclopedia libre
Osíxeno - Wikipedia, a enciclopedia libre (gl.wikipedia.org)
The retention of dust in protoplanetary disks: Evidence from agglomeratic olivine chondrules from the outer Solar System<...
The retention of dust in protoplanetary disks: Evidence from agglomeratic olivine chondrules from the outer Solar System<... (asu.pure.elsevier.com)
Frank MCDERMOTT | Associate Professor | PhD | University College Dublin, Dublin | UCD | UCD School of Earth Sciences |...
Frank MCDERMOTT | Associate Professor | PhD | University College Dublin, Dublin | UCD | UCD School of Earth Sciences |... (researchgate.net)
Stalagmites Reveal Ancient Secrets | Audubon
Stalagmites Reveal Ancient Secrets | Audubon (audubon.org)
United States - Geological Society of Nevada
United States - Geological Society of Nevada (gsnv.org)
Frontiers | Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes
Frontiers | Identifying Drivers of Seasonality in Lena River Biogeochemistry and Dissolved Organic Matter Fluxes (frontiersin.org)
Lithofacies, diagenesis and reservoir quality of Upper Shu'aiba reservoirs in northwestern Oman | GeoArabia | GeoScienceWorld
Lithofacies, diagenesis and reservoir quality of Upper Shu'aiba reservoirs in northwestern Oman | GeoArabia | GeoScienceWorld (pubs.geoscienceworld.org)
'Embryo' Planet Plowed Into Earth, Creating Moon -and Stayed
'Embryo' Planet Plowed Into Earth, Creating Moon -and Stayed (newser.com)
Forests and climate change - WSL
Forests and climate change - WSL (wsl.ch)