Calcium Isotopes
Effects of high compared with low calcium intake on calcium absorption and incorporation of iron by red blood cells in small children. (1/181)
BACKGROUND: The potential benefits of increasing calcium intake in small children must be balanced with the potential risk to iron utilization from high calcium intakes. OBJECTIVE: This study was designed to evaluate the relation between calcium intake and calcium absorption and iron incorporation into red blood cells. DESIGN: We performed a multitracer, crossover study of the absorption of calcium and red blood cell incorporation of iron in 11 preschool children aged 3-5 y who had been adapted for 5 wk to low- (502 +/- 99 mg) and high- (1180 +/- 117 mg) calcium diets. Stable-isotope studies were performed by using 44Ca and 58Fe given orally with meals and 46Ca given intravenously. RESULTS: Iron incorporation into red blood cells 14 d postdosing was similar (6.9 +/- 4.2% compared with 7.9 +/- 5.5%; NS) with the low- and high-calcium diets, respectively. Total calcium absorption (181 +/- 50 compared with 277 +/- 91 mg/d; P = 0.002) was greater in children with the higher calcium intake. CONCLUSIONS: Our findings indicate that small children may benefit from calcium intakes similar to those recommended for older children without adverse effects on dietary iron utilization. (+info)Characterization of prostanoid receptors in podocytes. (2/181)
Prostaglandins participate in the regulation of important glomerular functions and are involved in the pathogenesis of glomerular diseases. This study investigates the influence of prostaglandins on membrane voltage, ion conductances, cAMP accumulation, and cytosolic calcium activity ([Ca2+]i) in differentiated podocytes. Prostaglandin E2 (PGE2) caused a concentration-dependent depolarization and an increase of the whole cell conductance in podocytes (EC50 approximately 50 nM). Compared with PGE2, the EP2/EP3/EP4 receptor agonist 11-deoxy-PGE1 caused an equipotent depolarization, whereas the DP receptor agonist BW 245 C, the EP1/EP3 receptor agonist sulprostone, and the IP receptor agonist iloprost were at least 100 to 1000 times less potent than PGE2. The EP2 receptor agonist butaprost did not change membrane voltage of podocytes. The depolarizing effect of PGE2 was increased in an extracellular solution with a reduced Cl- concentration (from 145 to 32 mM). PGE2 and the prostaglandin agonists, but not the IP receptor agonist iloprost and the EP2 receptor agonist butaprost, induced a time- and concentration-dependent cAMP accumulation in podocytes. In fura-2 fluorescence experiments, PGE2, sulprostone, PGF2alpha, fluprostenol (a potent FP agonist), and U-46619 (a selective thromboxane A2 agonist) induced a biphasic increase of [Ca2+]i in 60 to 80% of podocytes. In reverse transcription-PCR studies, podocyte mRNA for the EP1, EP4, FP, and TP receptor could be amplified. These data indicate that in podocytes, PGE2 regulates distinct cellular functions via the EP1 and EP4 receptor, thereby increasing [Ca2+]i and cAMP, respectively. Furthermore, PGF1alpha and U-46619 increase [Ca2+]i via their specific receptors. (+info)Calcium isotope fractionation between soft and mineralized tissues as a monitor of calcium use in vertebrates. (3/181)
Calcium from bone and shell is isotopically lighter than calcium of soft tissue from the same organism and isotopically lighter than source (dietary) calcium. When measured as the (44)Ca/(40)Ca isotopic ratio, the total range of variation observed is 5.5 per thousand, and as much as 4 per thousand variation is found in a single organism. The observed intraorganismal calcium isotopic variations and the isotopic differences between tissues and diet indicate that isotopic fractionation occurs mainly as a result of mineralization. Soft tissue calcium becomes heavier or lighter than source calcium during periods when there is net gain or loss of mineral mass, respectively. These results suggest that variations of natural calcium isotope ratios in tissues may be useful for assessing the calcium and mineral balance of organisms without introducing isotopic tracers. (+info)Isotopic evidence for variations in the marine calcium cycle over the Cenozoic. (4/181)
Significant variations in the isotopic composition of marine calcium have occurred over the last 80 million years. These variations reflect deviations in the balance between inputs of calcium to the ocean from weathering and outputs due to carbonate sedimentation, processes that are important in controlling the concentration of carbon dioxide in the atmosphere and, hence, global climate. The calcium isotopic ratio of paleo-seawater is an indicator of past changes in atmospheric carbon dioxide when coupled with determinations of paleo-pH. (+info)High bioavailability of calcium in fortified Horlicks. (5/181)
OBJECTIVE: To compare the bioavailability of calcium carbonate-fortified Horlicks with calcium naturally present in milk. DESIGN: Randomised crossover within-subject comparison using a double label stable isotope technique. SETTING: Institute of Food Research, Human Nutrition Unit. PARTICIPANTS: Sixteen pre-menopausal women aged 23-40 y, habituated to a high-calcium diet (mean 1240 mg/day). RESULTS: Mean true fractional calcium absorption was 38.8% (s.d.+/-14.5) from Horlicks and 21.2% (s.d.+/-4.6) from milk. Significantly more calcium was absorbed from a serving of Horlicks than from the same quantity of calcium present in 420 g semi-skimmed milk (P<0.001). CONCLUSIONS: Fortified Horlicks is a highly bioavailable source of calcium. A single serving, containing at least 500 mg calcium, provides half the reference nutrient intake for the population sub-group with the highest requirement (adolescent boys) and more than half for all others. SPONSORSHIP: SmithKline Beecham funded this research project. (+info)Calcium absorption measured by stable calcium isotopes ((42)Ca & (44)Ca) among Northern Chinese adolescents with low vitamin D status. (6/181)
An adequate calcium intake and vitamin-D status is important for bone mineralization in adolescents. In Northern China, calcium intake and plasma vitamin-D level of adolescents is low due to low consumption of dairy foods and inadequate sunshine exposure. True fractional calcium absorption (TFCA) in Chinese adolescents has never been performed. This study aims to evaluate nutritional adaptation namely, TFCA and urinary calcium excretion among Chinese adolescents in northern China. (+info)Overview of the 7th European symposium on calcium-binding proteins in normal and transformed cells. (7/181)
The strong feature of the meeting was the continuing efforts described in many papers to resolve the multiple ways in which calcium ions are released into cells via messenger signals and then interact with receptors to cause differential internal cellular activation and cell/cell communication. An easy general way to relate these studies to cell components is to start analysis from the genetic structures lying behind all cell activities and then to explore the RNA production, the proteome, the small substrates and calcium levels themselves in turn while referring to the environment of a particular cell, organ or organism. There is then of course the overall physiology. I shall summarize the papers in this order of their main interests. (+info)A novel dual radio- and stable-isotope method for measuring calcium absorption in humans: comparison with the whole-body radioisotope retention method. (8/181)
BACKGROUND: Dietary calcium absorption can be determined only with the use of isotope techniques. Currently used isotope techniques require exclusive equipment or are not true tracer approaches. OBJECTIVE: The objective was to compare a dual-isotope method combining radioisotopes and stable isotopes with a whole-body radioisotope retention method for measuring calcium absorption. DESIGN: Seven healthy adults aged 21-27 y consumed a test meal containing 63 +/- 14 (macro x +/- SD) mg Ca together with a water solution of (47)Ca (0.11 MBq). One hour after ingestion, 18 mg (44)Ca was administered intravenously. All feces and urine were collected for 5 and 6 d, respectively. Calcium absorption was estimated from whole-body retention of the radioisotope 12 times over 3 wk after ingestion and from the excretion of (47)Ca and (44)Ca in a 24-h urine sample collected on day 2. (44)Ca in urine was determined by inductively coupled plasma mass spectrometry. RESULTS: Mean (+/- SD) calcium absorption was 75 +/- 9% with the dual-isotope method and was 74 +/- 8% with the whole-body radioisotope retention method. There was a high degree of agreement between the methods. CONCLUSION: The dual-isotope method is a valid approach for measuring calcium absorption from a single meal. (+info)
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Isotopes of calcium
National Isotope Development Center Official website Calcium isotopes data from The Berkeley Laboratory Isotopes Project's ( ... Isotopes of calcium, Calcium, Lists of isotopes by element). ... Calcium (20Ca) has 26 known isotopes, ranging from 35Ca to 60Ca ... Calcium also has a cosmogenic isotope, radioactive 41Ca, which has a half-life of 99,400 years. Unlike cosmogenic isotopes that ... All other calcium isotopes have half-lives measured in minutes or less. 40Ca comprises about 97% of naturally occurring calcium ...
Oxygen isotope ratio cycle
The calcium must rob the third from the water. The isotope ratio in the calcite is therefore the same, after compensation, as ... Responsible for these fluctuations in oxygenation were likely driven by the Lomagundi carbon isotope excursion. δ18O Isotope ... Oxygen isotope analysis considers only the ratio of 18O to 16O present in a sample. The calculated ratio of the masses of each ... Oxygen isotope ratio cycles are cyclical variations in the ratio of the abundance of oxygen with an atomic mass of 18 to the ...
Alkaline earth metal
... and all isotopes of radium are radioactive. Calcium-48 is the lightest nuclide to undergo double beta decay. Calcium and barium ... Calcium as a material has been known since at least the first century, as the ancient Romans were known to have used calcium ... Calcium sulfate has been known to be able to set broken bones since the tenth century. Calcium itself, however, was not ... Beryllium-7, beryllium-10, and calcium-41 are trace radioisotopes; calcium-48 and barium-130 only decay by double beta decay ...
Calcium-48
... is a scarce isotope of calcium containing 20 protons and 28 neutrons. It makes up 0.187% of natural calcium by mole ... 2002). "New neutron-rich isotopes, 34Ne, 37Na and 43Si, produced by fragmentation of a 64A MeV 48Ca beam". Physics Letters B. ... October 2006). "Synthesis of the isotopes of elements 118 and 116 in the 249Cf and 245Cm + 48Ca fusion reactions". Physical ... Isotope content page, Isotopes of calcium). ...
Stable 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 ... the expression stable-isotope ratio is preferably used to refer to isotopes whose relative abundances are affected by isotope ...
Isotope dilution
W. Riepe; W. Kaiser (1966). "Massenspektrometrische Spurenanalyse von Calcium, Strontium und Barium in Natriumazid durch ... In addition to the use of stable isotopes, radioactive isotopes can be employed in isotope dilution which is often encountered ... All isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots ... Consider a natural analyte rich in isotope iA (denoted as A), and the same analyte, enriched in isotope jA (denoted as B). Then ...
Surface exposure dating
This isotope may be produced by cosmic ray spallation of calcium or potassium. Climate proxy Lichenometry, measurement of ... The parent isotopes are the most abundant of these elements, and are common in crustal material, whereas the radioactive ... doi:10.1016/0016-7037(95)00429-7. Geomorphology and in situ cosmogenic isotopes. Cerling, T.E. and Craig, H. Annual Review of ... Stone, J; Allan, G; Fifield, L; Cresswell, R (1996). "Cosmogenic chlorine-36 from calcium spallation". Geochimica et ...
Isotope
All stable nuclides heavier than calcium-40 contain more neutrons than protons. Of the 80 elements with a stable isotope, the ... eight have six stable isotopes, ten have five stable isotopes, nine have four stable isotopes, five have three stable isotopes ... For the 80 elements that have one or more stable isotopes, the average number of stable isotopes is 251/80 ≈ 3.14 isotopes per ... Halbwertszeiten aller Isotope Exploring the Table of the Isotopes at the LBNL Current isotope research and information isotope. ...
Silicon isotope biogeochemistry
De La Rocha, Christina L.; DePaolo, Donald J. (2000-08-18). "Isotopic Evidence for Variations in the Marine Calcium Cycle Over ... Isotopes of silicon Isotope geochemistry Stable isotope ratio Isotope-ratio mass spectrometry Sutton, Jill N.; André, Luc; ... Silicon isotope biogeochemistry is the study of environmental processes using the relative abundance of Si isotopes. As the ... Currently, there are four main analytical methods for the measurement of Si isotopes: Gas Source Isotope-Ratio Mass ...
Reference materials for stable isotope analysis
Moore, L. J.; Machlan, L. A. (1972). "High-accuracy determination of calcium in blood serum by isotope dilution mass ... Isotopic labeling Isotopes of hydrogen Isotopes of carbon; δ13C Isotopes of oxygen; δ18O Isotopes of nitrogen; δ15N Isotopes of ... Isotope Isotopologue Isotopomer Isotope analysis Isotopic signature Stable Isotope Ratio Isotope geochemistry Isotope-ratio ... Clumped isotopes present a distinct set of challenges for isotopic reference materials. By convention the clumped isotope ...
Calcium
... isotope fractionation during mineral formation has led to several applications of calcium isotopes. In particular, the ... Other calcium preparations include calcium carbonate, calcium citrate malate, and calcium gluconate. The intestine absorbs ... Calcium is the first (lightest) element to have six naturally occurring isotopes. By far the most common isotope of calcium in ... Natural calcium is a mixture of five stable isotopes (40Ca, 42Ca, 43Ca, 44Ca, and 46Ca) and one isotope with a half-life so ...
Klaus Blaum
2013). "Masses of exotic calcium isotopes pin down nuclear forces". Nature. Springer Science and Business Media LLC. 498 (7454 ... 2009-03-19). "Discovery of 229Rn and the Structure of the Heaviest Rn and Ra Isotopes from Penning-Trap Mass Measurements". ...
Calcium carbonate
Mook, W. (2000). "Chemistry of carbonic acid in water". Environmental Isotopes in the Hydrological Cycle: Principles and ... calcium carbonate is prepared from calcium oxide. Water is added to give calcium hydroxide then carbon dioxide is passed ... non-calcium-based phosphate binders, particularly sevelamer. Excess calcium from supplements, fortified food, and high-calcium ... at least one study suggests that calcium carbonate might be as bioavailable as the calcium in cow's milk. Calcium carbonate is ...
Baryonyx
A 2018 study by the French palaeontologist Auguste Hassler and colleagues of calcium isotopes in the teeth of North African ... Hassler, A.; Martin, J. E.; Amiot, R.; Tacail, T.; Godet, F. Arnaud; Allain, R.; Balter, V. (2018). "Calcium isotopes offer ... "Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods". Geology. 38 (2): 139-142. Bibcode:2010Geo....38.. ... based on the oxygen isotope composition of spinosaurid teeth from around the world compared with that of other theropods and ...
Spinosauridae
A 2018 study by Auguste Hassler and colleagues of calcium isotopes in the teeth of North African theropods found that ... "Calcium isotopes offer clues on resource partitioning among Cretaceous predatory dinosaurs". Proceedings of the Royal Society B ... Isotope ratios from teeth from Baryonyx, Irritator, Siamosaurus, and Spinosaurus were compared with isotopic compositions from ... A 2010 publication by Romain Amiot and colleagues found that oxygen isotope ratios of spinosaurid bones indicates semiaquatic ...
Julie Ezold
Her recent work looks to optimize the production of transcurium isotopes. In 2018 she was recognized by Marquis Who's Who Top ... She studied the reactions of Berkelium-249 and Calcium-48. ... "Eleven new heaviest isotopes of elements $Z=105$ to $Z=117$ ... NC using the High Flux Isotope Reactor at Oak Ridge National Laboratory. Ezold has worked at Oak Ridge National Laboratory ... "Sensitivity Studies and Experimental Evaluation for Optimizing Transcurium Isotope Production". Nuclear Science and Engineering ...
Irritator
Hassler, A.; Martin, J.E.; Amiot, R.; Tacail, T.; Godet, F. Arnaud; Allain, R.; Balter, V. (April 11, 2018). "Calcium isotopes ... Many spinosaurs likely had semiaquatic habits, as has been shown in studies using techniques like isotope analysis and bone ... "Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods". Geology. 38 (2): 139-142. Bibcode:2010Geo....38.. ...
2018 in non-avian dinosaur paleontology
A. Hassler; J. E. Martin; R. Amiot; T. Tacail; F. Arnaud Godet; R. Allain; V. Balter (2018). "Calcium isotopes offer clues on ... as indicated by calcium isotope values from tooth enamel is published by Hassler et al. (2018). A study on the early evolution ...
Megalodon
A study focusing on calcium isotopes of extinct and extant elasmobranch sharks and rays revealed that megalodon fed at a higher ... Martin, J. E.; Tacail, T.; Sylvain, A.; Catherine, G.; Vincent, B. (2015). "Calcium isotopes reveal the trophic position of ... 0.9 Ma in age has been analyzed for isotope ratios of oxygen (18O/16O) and carbon (13C/12C), using a carbonate clumped-isotope ... Borrell, Asunción; Aguilar, Alex; Gazo, Manel; Kumarran, R. P.; Cardona, Luis (1 December 2011). "Stable isotope profiles in ...
Ariel Anbar
Anbar has also been involved in development of method to use calcium isotopes to study bone disease. Anbar led the NASA ... His group was the first to report natural fractionation of molybdenum isotopes, including how and why molybdenum isotopes ... "Rapidly assessing changes in bone mineral balance using natural stable calcium isotopes". Proceedings of the National Academy ... "Stable isotopes offer novel methods of disease detection". www.earthmagazine.org. Retrieved 2021-07-21. "NASA Astrobiology ...
Calcium cycle
The isotope Calcium-44 can help to indicate variations in calcium carbonate over long timespans and help explain variants in ... Calcium is stored in geologic reservoirs, most commonly in the form of calcium carbonate or as calcium silicate. Calcium- ... Inputs of dissolved calcium (Ca2+) to the ocean include the weathering of calcium sulfate, calcium silicate, and calcium ... Calcium stable isotopes have been used to study inputs and outputs of dissolved calcium in marine environments. For example, ...
Richard Eastell
"One-day test using stable isotopes to measure true fractional calcium absorption". Journal of Bone and Mineral Research. 4 (4 ... While at the Mayo Clinic, Eastell developed new non-radioactive methods for measuring how calcium was absorbed from the diet ... Eastell has pioneered new techniques for measuring calcium uptake and vitamin D conversion and is a leading expert in ...
Eagle Station group
Diagnostic differences are that the olivine is richer in iron and calcium. The group also has a distinct oxygen isotope ...
Permian-Triassic extinction event
Payne, J.; Turchyn, A.; Paytan, A.; Depaolo, D.; Lehrmann, D.; Yu, M.; Wei, J. (2010). "Calcium isotope constraints on the end- ... doi:10.1016/S0146-6380(01)00086-9. Palfy J, Demeny A, Haas J, Htenyi M, Orchard MJ, Veto I (2001). "Carbon isotope anomaly at ... However, the pattern of isotope shifts expected to result from a massive release of methane does not match the patterns seen ... Dickens GR, O'Neil JR, Rea DK, Owen RM (1995). "Dissociation of oceanic methane hydrate as a cause of the carbon isotope ...
Isotopes of strontium
... it readily substitutes for calcium in minerals. In addition to the four stable isotopes, thirty-two unstable isotopes of ... Radioactive isotopes of strontium primarily decay into the neighbouring elements yttrium (89Sr and heavier isotopes, via beta ... this application utilizes its chemical similarity to calcium, which allows it to substitute calcium in bone structures. In ... Isotopes of strontium, Strontium, Lists of isotopes by element). ... Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook ...
Moeraki Boulders
Their spherical shape indicates that the source of calcium was mass diffusion, as opposed to fluid flow. The larger boulders, 2 ... Pearson, M.J., and C.S. Nelson, 2005, Organic geochemistry and stable isotope composition of New Zealand carbonate concretions ... This is demonstrated by studies of their composition; specifically the magnesium and iron content, and stable isotopes of ...
Isotopes of argon
In the subsurface environment, it is also produced through neutron capture by 39K or alpha emission by calcium. The content of ... Argon isotopes data from The Berkeley Laboratory Isotopes Project's (Articles with short description, Short description with ... Many endeavors require argon depleted in the cosmogenic isotopes, known as depleted argon. Lighter radioactive isotopes can ... All other isotopes have half-lives of less than two hours, and most less than one minute. The least stable is 29Ar with a half- ...
Isotopes of samarium
It is treated by the body in a similar manner to calcium, and it localizes selectively to bone. Isotope masses from: Audi, ... Lighter unstable isotopes of samarium primarily decay by electron capture to isotopes of promethium, while heavier ones decay ... The long lived isotopes, 146Sm, 147Sm, and 148Sm, primarily decay by alpha decay to isotopes of neodymium. ... Isotopes of samarium, Samarium, Lists of isotopes by element). ... Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook ...
Mushroom cloud
Isotopes with gaseous precursors solidify on the surface of the particles as they are produced by decay. The largest, and ... In contrast, coral debris, based on calcium carbonate, tends to adsorb radioactive particles on its surface. The elements ... The induced isotopes include cobalt-60, 57 and 58, iron-59 and 55, manganese-54, zinc-65, yttrium-88, and possibly nickel-58 ... For example, the uranium-237 isotope is a unique thermonuclear explosion marker, as it is produced by a (n,2n) reaction from ...
Nama Group
Pruss, Sara B.; Blättler, Clara L.; Macdonald, Francis A.; Higgins, John A. (2018). "Calcium isotope evidence that the earliest ... Sr-Nd isotopes and tectonic implications". Journal of Petrology. 42 (11): 2109-2143. doi:10.1093/petrology/42.11.2109. Meert et ...
Neodymium
... isotopes. Four of the five stable isotopes have been predicted to decay to isotopes of cerium or samarium and are only ... on Some Physiological Activities in Oilseed Rape during Calcium (Ca2+) Starvation". 10th International Rapeseed Congress. 2: ... 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 × ...
Meteoritics
Condensation from the solar nebula is recorded by calcium-aluminium-rich inclusions and chondrules. These can be dated by using ... analysis of isotope ratios; and radiometric dating. These techniques are used to determine the age, formation process, and ...
Calcite
Continued dissolution of calcium carbonate-rich formations can lead to the expansion and eventual collapse of cave systems, ... These processes can be traced by the specific carbon isotope composition of the calcites, which are extremely depleted in the ... Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales ... Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, ...
Extended periodic table
Isotopes of unbinilium are predicted to have alpha decay half-lives of the order of microseconds. Initial analysis revealed ... was first attempted in 1985 by bombarding a target of einsteinium-254 with calcium-48 ions at the superHILAC accelerator at ... Therefore, the isotopes of most interest are 310126, 322126, and 354126, for these might be considerably longer-lived than ... From April to September 2012, an attempt to synthesize the isotopes 295119 and 296119 was made by bombarding a target of ...
Δ18O
δ13C δ15N δ34S Isotopic signature Isotope analysis Isotope geochemistry Paleothermometer Stable isotope ratio "USGS - Isotope ... Foraminifera shells are composed of calcium carbonate (CaCO3) and are found in many common geological environments. The ratio ... groups which may preserve the oxygen isotope ratios of environmental water. Fractionation of oxygen isotopes in these tissues ... As the observed isotope variations are similar in shape to the temperature variations recorded for the past 420 ky at Vostok ...
Prostate cancer
High supplemental calcium intake has been linked to advanced prostate cancer. Fish may lower prostate-cancer deaths, but does ... Enzalutamide is a nonsteroidal antiandrogen (NSAA). Alpharadin uses bone targeted Radium-223 isotopes to kill cancer cells by ... Koh KA, Sesso HD, Paffenbarger RS, Lee IM (December 2006). "Dairy products, calcium and prostate cancer risk". British Journal ... Datta M, Schwartz GG (2012). "Calcium and vitamin D supplementation during androgen deprivation therapy for prostate cancer: a ...
Uranium nitrides
2U + 3H2 → 2UH3 2UH3 + 1.5N2 → U2N3 U2N3 → UN + 0.5N2 Use of the isotope 15N (which constitutes around 0.37% of natural ... The uranium dinitride (UN2) compound has a face-centered cubic crystal structure of the calcium fluoride (CaF2) type with a ... nitrogen) is preferable because the predominant isotope, 14N, has a significant neutron absorption cross section which affects ...
Mycorrhizal network
Detection of the isotopes was found in receiver plant shorts, expressing carbon transfer from fungus to plant tissues. When ... Other nutrients may also be transferred, as strontium and rubidium, which are calcium and potassium analogs respectively, have ... Further investigation of bidirectional movement and the net transfer was analyzed using pulse labeling technique with isotopes ...
Danian
This hyperthermal also led to a shallowing of the oceanic lysocline, as evidenced by the significant decrease in calcium ... is evidenced in the geologic record by two negative carbon isotope excursions and is believed to have led to a 2-3 °C warming ...
History of the periodic table
Soddy later proposed to call these elements with complete chemical identity "isotopes". The problem of placing isotopes in the ... Here, Döbereiner found that strontium's properties were intermediate to those of calcium and barium. Döbereiner, J. W. (1829 ... isotopes), also determining that the existence of different isotopes was mostly irrelevant in determining chemical properties. ... They became known as isotopes, from the Greek isos topos ("same place"). Austrian chemist Friedrich Paneth cited a difference ...
Craniopharyngioma
It is frequently accompanied by calcium deposition and may have a microscopic papillary architecture. A computed tomography (CT ... Alternative treatments consisting of radiosurgery, intracavitary application of isotopes, and brachytherapy also offer an ... so contain deposits of calcium that are evident on an X-ray. A physician can conduct a few scans and tests to diagnose a person ...
Prussian blue
"Questions and Answers on Calcium-DTPA and Zinc-DTPA (Updated)". U.S. Food & Drug Administration. 3 November 2018. Retrieved 21 ... and radioactive isotopes of caesium. The therapy exploits the compound's ion-exchange properties and high affinity for certain ...
Ice core
Water isotope records, analyzed in cores from Camp Century and Dye 3 in Greenland, were instrumental in the discovery of ... Some species, such as calcium and ammonium, show strong seasonal variation. In some cases there are contributions from more ... Oxygen has three stable isotopes, 16 O, 17 O and 18 O. The ratio between 18 O and 16 O indicates the temperature when the snow ... "Isotopes and the delta notation". Centre for Ice and Climate. 8 September 2009. Retrieved 25 May 2017. Mulvaney, Robert (20 ...
Origin and occurrence of fluorine
Handbook of Isotopes in the Cosmos: Hydrogen to Gallium; Donald Clayton; pages 101-104 Renda, A.; Fenner, Y.; Gibson, B.K.; ... The mineral also has a dark black color, perhaps from free calcium (not bonded to fluoride). In 2012, a study reported ...
Zinc in biology
Some EF-hand calcium binding proteins such as S100 or NCS-1 are also able to bind zinc ions. The U.S. Institute of Medicine ( ... 1224-1225 Kohen, Amnon; Limbach, Hans-Heinrich (2006). Isotope Effects in Chemistry and Biology. Boca Raton, Florida: CRC Press ... the dysregulation of calcium homeostasis, glutamatergic neuronal excitotoxicity, and interference with intraneuronal signal ... "Functional Status of Neuronal Calcium Sensor-1 Is Modulated by Zinc Binding". Frontiers in Molecular Neuroscience. 11: 459. doi ...
Granite
I-type granites are characterized by a high content of sodium and calcium, and by a strontium isotope ratio, 87Sr/86Sr, of less ... Their strontium isotope ratio is typically greater than 0.708, suggesting a crustal origin. They also commonly contain ... Potassium-40 is a radioactive isotope of weak emission, and a constituent of alkali feldspar, which in turn is a common ... Further fractionation reduces the content of iron, calcium, and titanium. This is reflected in the high content of alkali ...
Olfactory receptor
Such isotope effects are exceedingly common, and so it is well known that deuterium substitution will indeed change the binding ... The cAMP opens cyclic nucleotide-gated ion channels which allow calcium and sodium ions to enter into the cell, depolarizing ... As evidence it has been shown that flies can differentiate between two odor molecules which only differ in hydrogen isotope ( ... Schramm VL (October 2007). "Binding isotope effects: boon and bane". Current Opinion in Chemical Biology. 11 (5): 529-36. doi: ...
CA-38
... a highway in the State of California Calcium-38 (Ca-38 or 38Ca), an isotope of calcium Caproni Ca.38, an Italian aircraft This ...
Mass-independent fractionation
... resulting in a mass-independent distribution of isotopes. The mass-independent distribution of isotopes in stratospheric ozone ... in the oxygen isotopic composition of refractory calcium-aluminium-rich inclusions in the Allende meteorite. The inclusions, ... The mass-dependent isotope effect occurs in asymmetric species, and arises from the difference in zero-point energy of the two ... Mass-independent isotope fractionation or Non-mass-dependent fractionation (NMD), refers to any chemical or physical process ...
Qarhan Playa
1997), "Stable Isotopes Distribution in Core Ck6 and Variations of Paleoclimate over Qarhan Lake Region in Qaidam Basin, China ... Other minerals include potash, carnallite (potassium magnesium chloride), calcium chloride, magnesium, lithium, boron, iodine, ... April 2018), "Evalutation of Boron Isotopes in Halite as an Indicator of the Salinity of Qarhan Paleolake Water in the Eastern ... 1990), "Hydrogen and Oxygen Stable Isotope Analyses of Fluid Inclusions in Halite in Charhan Salt Lake with Geochemical ...
Christopher Busby
Busby, Chris (7 November 2011). "Calcium and other supplements to protect against internal radiation". Prochazka, H; Jandl, J; ... Nuclear Pollution and Human Health claiming that isotopes which decay sequentially, emitting two or more particles in a short ...
Valley of stability
Isotopes with the atomic number of the fission products and an N/Z near that of uranium or other fissionable nuclei have too ... For this reason, the valley of stability does not follow the line Z = N for A larger than 40 (Z = 20 is the element calcium). ... Chart of nuclides (isotopes) by binding energy, depicting the valley of stability. The diagonal line corresponds to equal ... The island of stability is a region outside the valley of stability where it is predicted that a set of heavy isotopes with ...
Cathedral Peak Granodiorite
inconsistencies in the distribution of the trace elements and in the initial isotope ratios of strontium and neodymium. Isotope ... Shows normal zoning with calcium-rich cores and sodium-rich rims. Exhibits simple carlsbad and albite twinning. Grain size ...
Harmon Craig
They found unexpectedly high proportions of the helium-3 isotope in the ocean waters. Craig concluded that the isotope was ... Craig used the carbon dioxide released from calcium carbonate fossils as a basis for future researches involving the carbon ... Craig, H. (1965). "The measurement of oxygen isotope paleotemperatures". In Tongiorgi, E. (ed.). Stable Isotopes in ... with The geochemistry of the stable carbon isotopes, a thesis on carbon isotope geochemistry. Craig created his thesis to find ...
Ligand binding assay
A prominent signaling molecule in cells is Calcium, (Ca2+), which can be detected with a Fluo-4 acetoxymethyl dye. It binds to ... These give off bursts of light when stimulated by an isotope, which can easily be measured. Ligands are radiolabeled using ... which uses a Calcium 3 assay reagent that does not require a washing step. As a result, change in dye fluorescence can be ...
Donald J. DePaolo
... with a focus on isotopes of calcium [11]. 2008 DOE/Basic Energy Sciences/BESAC subcommittee on New Era Science 2005-2008 Chair ... Key principles of the Nd isotope system were laid out in his 1988 book, Neodymium Isotope Geochemistry: An Introduction. ... His research interests focus on using naturally occurring isotope variations to explore questions such as Origin of the deep- ... DePaolo and his then advisor Gerald Wasserburg made the first Nd isotope measurements on terrestrial igneous rocks [5]. An ...
Plankton
... ic algae bloom of coccolithophores off the southern coast of England Foraminiferans have calcium carbonate shells and ... Tappan, Helen (April 1968). "Primary production, isotopes, extinctions and the atmosphere". Palaeogeography, Palaeoclimatology ...
Thulium
... isotopes. Thulium-169 is thulium's only primordial isotope and is the only isotope of thulium that is thought to be stable; it ... The blue fluorescence of Tm-doped calcium sulfate has been used in personal dosimeters for visual monitoring of radiation. Tm- ... Most other isotopes have half-lives of a few minutes or less. Thirty-five isotopes and 26 nuclear isomers of thulium have been ... Most isotopes of thulium lighter than 169 atomic mass units decay via electron capture or beta-plus decay, although some ...
Scaly-foot gastropod
The innermost layer is made of aragonite (about 250 μm thick), a form of calcium carbonate that is commonly found both in the ... Chemoautotrophic origin of the stable carbon isotope 13C was confirmed experimentally. This gastropod is a simultaneous ... carbon and nitrogen stable-isotope compositions can be measured. There are depleted values of δ13C in the oesophageal gland ( ...
Isotope data for calcium-40 in the Periodic Table
Detailed decay information for the isotope calcium-40 including decay chains and daughter products. ... Isotopes of Calcium (click to see decay chain):. 34Ca 35Ca 36Ca 37Ca 38Ca 39Ca 40Ca 41Ca 42Ca 43Ca 44Ca 45Ca 46Ca 47Ca 48Ca 49 ... Calcium Pictures Page. Al. Si. P. S. Cl. Ar. K. Ca. Calcium Technical Data. Sc. Ti. V. Cr. Mn. Fe. Co. Ni. Cu. Zn. Ga. Ge. As. ... Click any isotope in diagram to see its data.. Decay chain image generated by Mathematicas GraphPlot and IsotopeData functions ...
Isotope data for calcium-46 in the Periodic Table
Detailed decay information for the isotope calcium-46 including decay chains and daughter products. ... Isotopes of Calcium (click to see decay chain):. 34Ca 35Ca 36Ca 37Ca 38Ca 39Ca 40Ca 41Ca 42Ca 43Ca 44Ca 45Ca 46Ca 47Ca 48Ca 49 ... Calcium Pictures Page. Al. Si. P. S. Cl. Ar. K. Ca. Calcium Technical Data. Sc. Ti. V. Cr. Mn. Fe. Co. Ni. Cu. Zn. Ga. Ge. As. ... Click any isotope in diagram to see its data.. Decay chain image generated by Mathematicas GraphPlot and IsotopeData functions ...
Calcium isotope fractionation in alpine plants - Research Collection
Additive effects of acidification and mineralogy on calcium isotopes in Triassic/Jurassic boundary limestones - Ocean...
The coupled nature of the carbon and calcium cycles allows calcium isotopes to be used for constraining carbon cycle dynamics ... We present a high-resolution calcium isotope (δ44/40Ca) record from 100 m of marine limestone spanning the Triassic/Jurassic ... Additive effects of acidification and mineralogy on calcium isotopes in Triassic/Jurassic boundary limestones Published 9 ... Additive effects of acidification and mineralogy on calcium isotopes in Triassic/Jurassic boundary limestones. Geochemistry, ...
NASA-funded Research: Earlier Detection of Bone Loss - SpaceRef
Thats similar to what happens with calcium isotopes when bones form. Bone favors lighter calcium isotopes and picks them over ... the lighter isotopes of calcium enter bone a little faster than the heavier isotopes. That difference, called "isotope ... "Instead of isotopes of calcium, think about jelly beans," explained Jennifer Morgan, lead author of the study. "We all have our ... Calcium isotope measurements seem poised to assume an important role in detecting bone disease - in space, and on Earth. The ...
Molecules | Free Full-Text | Fatty Acid and Stable Carbon Isotope Composition of Slovenian Milk: Year, Season, and Regional...
The stable isotope composition of fatty acids also proved to be a better biomarker of metabolic transformation processes in ... This study examined the percentage and stable isotope ratios of fatty acids in milk to study seasonal, year, and regional ... Calcium salts of palm oil, canola and soy, corn. 32.60 ± 2.13. 32.7 ± 2.48. 33.2 ± 2.11. 34.1 ± 1.73. 31.6 ± 2.01. 32.9 ± 1.86 ... Stable Carbon Isotope Composition of FA in Milk This study used the stable carbon isotope composition of individual FAs to ...
Clinical Chemistry and Laboratory Medicine (CCLM) Volume 56 Issue 1
Determination of serum calcium levels by 42Ca isotope dilution inductively coupled plasma mass spectrometry. ... Methods: We developed a reference method for measuring serum calcium levels by isotope dilution inductively coupled plasma mass ... Conclusions: ID ICP-MS is a simple and accurate candidate reference method for serum calcium measurement and can be used to ... Background : Serum calcium level is an important clinical index that reflects pathophysiological states. However, detection ...
Calcium - Conservapedia
Number of Stable Isotopes 6 Density (grams per cc) 1.55 g/cm^3 ... Taking calcium internally can promote bone growth. Obtained ... Calcium is a very important element to human physiology, as calcium-phosphate salts form the basis for the creation of bones. ... Consuming too much calcium can lead to kidney stones, which are typically composed of calcium deposits. ... Calcium in its pure form is referred to as "the white element" and must be kept isolated from air. ...
GSI - Details
In the nuclear reaction of 48Ca+244Pu (calcium and plutonium), among others, two flerovium isotopes are produced: 288Fl and 289 ... Isotopes with mass numbers around 200 near the magic neutron number N=126 play a crucial role in the synthesis of even heavier ... Several isotopes in this range have been detected for the first time and their properties determined, among them possibly 200- ... Another field of research that benefits from the increased intensities of the GSI accelerators is the study of isotopes that ...
Redcon1 Isotope - I'll Pump You Up
Redcon1 Isotope is an ultra-pure, ultra-premium whey isolate protein that gives you 25 grams of the best protein you can buy! ... Calcium - 90 mg. Ingredients:. Contains cold processed micro and ultra filtered Whey Protein Isolate, Ion Exchanged Whey ... Redcon1 Isotope. $44.99. - $89.99. Redcon1 Isotope is an ultra-pure, ultra-premium whey isolate protein that gives you 25 grams ... So Dont Just Grab The Cheapest Protein On The Shelf - Choose The Quality Of RedCon1 - Choose Isotope!. Warnings. Discuss with ...
New spinosaurids from the Wessex Formation (Early Cretaceous, UK) and the European origins of Spinosauridae | Scientific Reports
Hassler, A. et al. Calcium isotopes offer clues on resource partitioning among Cretaceous predatory dinosaurs. Proc. R. Soc. B ... Amiot, R. et al. Oxygen isotope evidence for semi-aquatic habits among spinosaurid theropods. Geology 38, 139-142 (2010). ... Amiot, R. et al. Oxygen isotope composition of continental vertebrate apatites from Mesozoic formations of Thailand; ... Robinson, S. A. & Hesselbo, S. P. Fossil-wood carbon-isotope stratigraphy of the non-marine Wealden Group (Lower Cretaceous, ...
Sulphur, oxygen and strontium isotope compositions of Middle Miocene (Badenian) calcium sulphates from the Carpathian Foredeep,...
... calcium sulphates from the Carpathian Foredeep, Poland: palaeoenvironmental implications ... oxygen and strontium isotope compositions of Middle Miocene (Badenian) ... Sulphur, oxygen and strontium isotope compositions of Middle Miocene (Badenian) calcium sulphates from the Carpathian Foredeep ... Sulphur, oxygen and strontium isotope compositions have been measured in sulphate (gypsum and anhydrite) samples from the ...
Isotope · Filter & sort magical layouts
Isotope Commercial Developer License for 1 developer $25 Isotope Commercial Team License for up to 8 developers $110 Isotope ... Include the Isotope .js. file in your site.. ,script src=/path/to/isotope.pkgd.min.js,,/script, Isotope works on a container ... You can use Isotope with vanilla JS: new Isotope( elem, options ). . The Isotope(). constructor accepts two arguments: the ... unpkg.com/isotope[email protected]/dist/isotope.pkgd.min.js,,/script, Package managers. Install with npm: npm install isotope-layout. ...
Journal name: Biogeochemistry / Subject: adsorption / Subject term: biogeochemistry - PubAg Search Results
... calcium; rooting; woody plants; biogeochemistry; calcium oxalate; adsorption; alpine plants; isotope fractionation; flowers; ... stable calcium isotope ratios were measured in various species of alpine plants, including woody species, grasses and herbs. ... In order to develop Ca isotopes as a tracer for biogeochemical Ca cycling in terrestrial environments and for Ca utilisation in ... Analysis of plant parts (root, stem, leaf and flower samples) provided information on Ca isotope fractionation within plants ...
Related articles
Slovak, N. M. and Paytan, A.: Application of Sr Isotopes in Archaeology, in Handbook of Environmental Isotope Geochemistry, ... A European map of groundwater pH and calcium Michal Hájek, Borja Jiménez-Alfaro, Ondřej Hájek, Lisa Brancaleoni, Marco ... The boron isotope composition in the skeleton of massive Porites corals from the central Great Barrier Reef is used to ... They will be able to compare our modern data with their own isotope data in old ice, for example in glaciers, and in permafrost ...
Facts About Californium | Live Science
All californium isotopes are radioactive. Cf-251 is the most stable with a half-life of about 800 years. The isotope Cf-252 is ... For example, element 118, oganesson, the heaviest element, was produced when scientists bombarded californium with calcium ions ... Number of isotopes (atoms of the same element with a different number of neutrons): 20 isotopes whose half-lives are known with ... Isotopes that behave in this way are very unusual, according to Chemistry Explained. Cf-252 is used in a variety of industries ...
'Hudson River fish found to contain radioactive isotope' by Greg Clary - Indian Point Safe Energy...
Health officials warned at the time that it competed with calcium in human bodies, especially in growing children, and could ... The radioactive isotope was discovered leaking almost a year ago at the Indian Point nuclear plants, and tests on 12 fish show ... No other radioactive isotopes were found in the fish, federal regulators said.. Three of the upriver fish had strontium levels ... "Hudson River fish found to contain radioactive isotope" by Greg Clary. by Site Admin on Jan 16, 2007 • 12:23 pm No Comments ...
Medicine, Endocrinology Division - Research Output - Northwestern Scholars
Potassium
The radioactive isotope potassium-40 gives us a way of dating rocks. Potassium-40 decays to argon-40 and calcium-40 with a half ... Isotopes: Potassium has 20 isotopes whose half-lives are known, with mass numbers 35 to 54. Naturally occurring potassium is a ... Cadmium - Calcium - Californium - Carbon - Cerium - Cesium - Chlorine - Chromium - Cobalt - Copernicium - Copper - Curium ... Most people are familiar with carbon dating, which uses the decay of the radioactive carbon-14 isotope to find the ages of once ...
TeVPA 2022 (8-August 12, 2022): Dark Matter · Indico
Meteoritical Bulletin: Entry for Elephant Moraine 96286
Massive Star Explosion Seeded the Early Solar System, Meteorite Study Suggests | Space
The scientists focused on a wide range of isotopes within the inclusions. In general, elements come in a variety of isotopes ... Theyfocused on lumps within this meteorite known as calcium-aluminum-rich inclusions. These particles are some of the oldest ... Brennecka and his colleagues discovered these inclusions all had similar concentrations of isotopes. However, the ...
Evaluation of an artificial intelligence coronary artery calcium scoring model from computed tomography<...
Isotopes of Calcium Medicine and Dentistry 100% * Coronary Artery Medicine and Dentistry 100% ... OBJECTIVES: Coronary artery calcium (CAC) scores derived from computed tomography (CT) scans are used for cardiovascular risk ... Evaluation of an artificial intelligence coronary artery calcium scoring model from computed tomography. In: European Radiology ... Evaluation of an artificial intelligence coronary artery calcium scoring model from computed tomography. European Radiology. ...
Flerovium - Element information, properties and uses | Periodic Table
This rare, but naturally occurring isotope of calcium was blasted into the plutonium for 40 days, during which 5 million ... in Russia produced it by bombarding plutonium with calcium. It needed 5 billion billion (5 x 1018) atoms of calcium to be fired ... Isotopes Atoms of the same element with different numbers of neutrons.. CAS number The Chemical Abstracts Service registry ... There are four known isotopes of flerovium with mass numbers 286-289. The longest-lived is 289 and it has a half-life of 2.6 ...
Radioactive Strontium Found in Hilo, Hawaii Milk
A radioactive isotope of strontium has been detected in American milk for the first time since Japans nuclear disaster-in a ... A radioactive isotope of strontium has been detected in American milk for the first time since Japans nuclear disaster-in a ... Both are "bone-seekers," chemically similar to calcium, that collect in bone and marrow, where they are known to cause cancer. ... The two man-made isotopes of strontium-Sr-89 and Sr-90-are among the most dangerous products of nuclear fission to human and ...
Physics - How Nature's Donuts Get Their Wrinkles
Carbon isotopesRatiosRadioactive isotopeAtomsStable calcium isotopesCarbonateNeutronsKnown isotopesUraniumOxygenCompositionFractionationNaturallySuperheavyBariumBoneIonsGeochemistryInclusions40CaTracerSulphurPlutoniumNucleiMeasurementsSodiumBehaveCadmiumCesiumTrace elementsAtomicElementRatioGramsAbundanceCompoundsDepositsMineralElementsAbstractBonesNuclear reactionLaboratoryGypsumNeuroendocrineZincAbsorption
Carbon isotopes1
- All sediment data have been thoroughly quality controlled, focusing on epibenthic foraminiferal species (such as Cibicidoides wuellerstorfi or Planulina ariminensis) to improve the comparability of model and sediment core carbon isotopes. (pangaea.de)
Ratios8
- But 15 years ago, corresponding author Joseph Skulan, now an adjunct professor at ASU, combined all the factors into a mathematical model that predicted that calcium isotope ratios in blood and urine should be extremely sensitive to bone mineral balance. (spaceref.com)
- But if a disease throws the balance off then you ought to see a shift in the calcium isotope ratios. (spaceref.com)
- This study examined the percentage and stable isotope ratios of fatty acids in milk to study seasonal, year, and regional variability. (mdpi.com)
- While sedimentary gypsum displays sulphur, oxygen and strontium isotope ratios close to contemporaneous (Badenian) seawater, diagenetic anhydrite values are largely elevated. (gov.pl)
- By measuring strontium isotope ratios in bony tissues known as ear stones, scientists can now pinpoint exactly which stream the salmon lived in and tell much about the timing of migrations in the life of the ocean-going fish. (newscientist.com)
- Our method is very robust, because strontium isotope ratios are governed by the underlying geology of the region, which changes little over time," says Kennedy. (newscientist.com)
- The researchers are currently building up a database of strontium isotope ratios for streams on the US east coast. (newscientist.com)
- By assessing ratios of calcium, barium and strontium as well as the number of strontium isotopes, the team was able to deduce both diet and the size of the area that these individuals ranged over. (scientificamerican.com)
Radioactive isotope4
- The radioactive isotope was discovered leaking almost a year ago at the Indian Point nuclear plants, and tests on 12 fish show four with detectible amounts, according to a memo obtained by The Journal News. (ipsecinfo.org)
- A radioactive isotope of strontium has been detected in American milk for the first time since Japan's nuclear disaster-in a sample from Hilo, Hawaii-the Environmental Protection Agency revealed yesterday. (forbes.com)
- EPA considers Sr-90, meanwhile, "the most important radioactive isotope in the environment" because of its health impacts and a longer half-life of 29 years. (forbes.com)
- Consequently, top carnivores can accumulate very high concentrations of this radioactive isotope, even if only very low concentrations are released to the environment. (riverkeeper.org)
Atoms6
- Isotopes are atoms of an element that differ in their masses. (spaceref.com)
- Number of isotopes (atoms of the same element with a different number of neutrons): 20 isotopes whose half-lives are known with mass numbers 237 to 256. (livescience.com)
- It needed 5 billion billion (5 x 10 18 ) atoms of calcium to be fired at the target to produce a single atom of flerovium, in an experiment lasting 40 days. (rsc.org)
- As the handful of atoms began to decay - a process that takes less than a tenth of a second - the team saw six previously undiscovered isotopes of other heavy elements, the researchers report in an upcoming issue of Physical Review Letters . (sciencenews.org)
- Stable calcium atoms that have the same atomic number as the element calcium, but differ in atomic weight. (nih.gov)
- The radioactive oganesson atom is very unstable, and since 2005, only five (possibly six) atoms of the isotope oganesson-294 have been detected. (elementpillows.com)
Stable calcium isotopes2
- It is titled "Rapidly assessing changes in bone mineral balance using natural stable calcium isotopes. (spaceref.com)
- Ca-42-44, 46, and 48 are stable calcium isotopes. (nih.gov)
Carbonate8
- Our study demonstrates that coupled models of the carbon and calcium cycles have the potential to help distinguish contributions of primary seawater isotopic changes from local or diagenetic effects on the δ44/40Ca of carbonate sediments. (news-oceanacidification-icc.org)
- Ear stones, or otoliths, are small lumps of calcium carbonate that are progressively laid down in layers, like tree rings. (newscientist.com)
- Analysis of calcium carbonate samples by Finnigan MAT253 mass spectrometer systems. (whoi.edu)
- Crystallization processes (nucleation and growth) have a role in the "kinetic" incorporation of isotopes and trace elements in calcium carbonate crystals. (conftool.com)
- Late Quaternary deep water circulation in the South Atlantic: Reconstruction from carbonate dissolution and benthic stable isotopes. (pangaea.de)
- Heavy isotope dating techniques, particularly uranium-lead method, are well suited for carbonate minerals studies. (cerege.fr)
- U-Th dating, a very precise dating technique based on the radioactive decay of Uranium isotopes into Thorium, determines the age of calcium carbonate formations up to an age of 500,000 years. (mpg.de)
- Carbonate is naturally occurring in seawater, and it is a crucial building block for organisms that build calcium carbonate hard parts, like clams, oysters, lobsters, corals, and even the tiny plankton that serve as the base of the ocean's food chain. (timescavengers.blog)
Neutrons5
- The isotope Cf-252 is a very strong neutron emitter, meaning it has the unusual property of giving off neutrons when it breaks apart. (livescience.com)
- This isotope has a variety of uses, including acting as a neutron emitter, providing neutrons for the start-up of nuclear reactors. (livescience.com)
- Nuclear theory suggests that isotope 298, with 184 neutrons, should be much more stable but that has yet to be made. (rsc.org)
- The researchers achieved the first observation of alpha decay-a process in which a nucleus releases two protons and two neutrons-for a specific isotope of dubnium (element 105). (aps.org)
- Each isotope of an element differs in the number of neutrons in its nucleus, a variable that can affect radioactivity and other properties. (sciencenews.org)
Known isotopes1
- There are four known isotopes of flerovium with mass numbers 286-289. (rsc.org)
Uranium3
- It has excellent separation efficiency, sensitivity and linearity, and it is used for the analysis of isotopes of strontium, lead, thorium and uranium. (cerege.fr)
- Fluorine gas is primarily used to make certain chemical compounds, the most important of which is uranium hexafluoride, used in separating isotopes of uranium for use in nuclear reactors and nuclear weapons. (cdc.gov)
- The radioactivity of this material is mainly due to the presence of naturally occurring Uranium and Thorium and the daughter isotopes of these elements present in phosphogypsum. (differencebetween.com)
Oxygen5
- 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)
- We measured the stable water isotope composition of oxygen (δ 18 O) and hydrogen (δ 2 H) with a mass spectrometer. (copernicus.org)
- 2009) Oxygen- and magnesium-isotope compositions of calcium-aluminum-rich inclusions from CR2 carbonaceous chondrites. (usra.edu)
- 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)
- Interdecadal-decadal climate variability from multicoral oxygen isotope records in the South Pacific Convergence Zone region since 1650 A.D. (columbia.edu)
Composition4
- This research has measured the bioavailable strontium isotope composition of soil and rock samples from the major geological units in Israel. (copernicus.org)
- The boron isotope composition in the skeleton of massive Porites corals from the central Great Barrier Reef is used to reconstruct the seawater pH over the 1940-2009 period. (copernicus.org)
- The isotope composition of XeSIN scalable trading strategies not important because XeQ is by far the major Xe component. (qrforex.com)
- Plant litter composition and stable isotope signatures vary during decomposition in blue carbon ecosystems. (bluecarbonlab.org)
Fractionation1
- That difference, called "isotope fractionation," is the key. (spaceref.com)
Naturally2
- With the new technique, bone loss is detected by carefully analyzing the isotopes of the chemical element calcium that are naturally present in urine. (spaceref.com)
- The key difference between gypsum and phosphogypsum is that gypsum is a naturally occurring form of calcium sulfate , whereas phosphogypsum is a synthetic form of calcium sulfate . (differencebetween.com)
Superheavy3
- The experiments dealt with topics from a wide range of scientific disciplines, from medicine and materials research to the properties of superheavy elements and the complex structure of short-lived isotopes that play a role in element synthesis in the universe. (gsi.de)
- The experiment at the SHE Factory, however, benefited from a more sophisticated data analysis and from an optimized separator-a device that isolates generated superheavy nuclei from the calcium beam and from the other reaction products. (aps.org)
- Some of the isotopes are living longer, or have a longer half-life, than previously observed superheavy elements. (sciencenews.org)
Barium1
- Must wait 7 days after any Radiology procedure if performed with Iodine, Barium, Nuclear Medicine Isotopes. (rwjbh.org)
Bone7
- When bones form, the lighter isotopes of calcium enter bone a little faster than the heavier isotopes. (spaceref.com)
- Bone favors lighter calcium isotopes and picks them over the heavier ones. (spaceref.com)
- Taking calcium internally can promote bone growth. (conservapedia.com)
- Health officials warned at the time that it competed with calcium in human bodies, especially in growing children, and could affect bone development. (ipsecinfo.org)
- Furthermore, radium associates with calcium in living systems and accumulates in bone. (cdc.gov)
- Both are "bone-seekers," chemically similar to calcium, that collect in bone and marrow, where they are known to cause cancer. (forbes.com)
- It reduces blood pressure, stress, kidney stone formation, bone calcium loss as well as improves blood sugar levels, heart health, and nerve synapses. (natureprovides.com)
Ions3
- Researchers have achieved long-distance entanglement between two calcium ions, each of which lies in a different building, showing that trapped ions could be used to create quantum networks. (aps.org)
- The team fired a beam of calcium ions at a target containing the radioactive metal americium, creating isotopes of moscovium (element 115) among the collision products. (aps.org)
- The nuclear chemists created a sample of element 114 by bombarding a plutonium target with a beam of calcium ions. (sciencenews.org)
Geochemistry1
- Zhang Yilin competed with her FYP project " Sea surface temperature and sea surface salinity calibration using Porites coral geochemical proxies from Dongsha Atoll in the South China Sea ", supervised by Assoc Prof Wang Xianfeng in the Isotope Geochemistry Lab . (ntu.edu.sg)
Inclusions3
40Ca2
- We present a high-resolution calcium isotope (δ44/40Ca) record from 100 m of marine limestone spanning the Triassic/Jurassic boundary in two stratigraphic sections from northern Italy. (news-oceanacidification-icc.org)
- Coupled numerical models of the geological carbon and calcium cycles demonstrate that this δ44/40Ca excursion is too large to be explained by changes to seawater δ44/40Ca alone, regardless of CO2 injection volume and duration. (news-oceanacidification-icc.org)
Tracer2
- 4 procedure may be made by adding a tracer consisting of an isotope of radium not expected in the sample and noting its recovery at the end of the analytical procedure. (cdc.gov)
- Die HydroTraP Gruppe verwendet verschiedene im flüssigen Wasser sowie im Eis enthaltene Spurenelemente, Verbindungen und Isotope (Tracer) für die Altersdatierung, um Chronologien von Archiven sowie Erkenntnisse über die Dynamik von Oberflächen- und Grundwässern ebenso wie von Gletschern zu gewinnen. (uni-heidelberg.de)
Sulphur1
- Stable isotopes : natural and anthropogenic sulphur in the environment / edited by H. R. Krouse and V. A. Grinenko. (who.int)
Plutonium2
- The two main colours represent the creation of the element from calcium and plutonium. (rsc.org)
- Despite several attempts to make element 114, it was only in 1998 that a team led by Yuri Oganessian and Vladimir Utyonkov at the Joint Institute for Nuclear Research (JINR) in Russia produced it by bombarding plutonium with calcium. (rsc.org)
Nuclei1
- Isotopes with mass numbers around 200 near the magic neutron number N=126 play a crucial role in the synthesis of even heavier nuclei. (gsi.de)
Measurements3
- Noble gas abundance and isotope ratio measurements for seawater and fresh waters, rocks, and other materials. (whoi.edu)
- Trace metal and isotope ratio measurements. (whoi.edu)
- Our research calls for high precision measurements of relative or absolute abundances of isotopes present in the environment, in trace (μg/g) or ultra-trace concentrations (ng/g or less). (cerege.fr)
Sodium4
- For starters, you want the purest product possible - this means no added fillers or other unwanted ingredients - Isotope by RedCon1 is just the protein you're looking for - it's a pure, clean Whey Isolate Protein Isolate that gives you 25 grams of premium protein per scoop with only .5 grams of fat, 1.5 grams of sugar, low sodium and low cholesterol. (illpumpyouup.com)
- Researchers have discovered the heaviest-known bound isotope of sodium and characterized other neutron-rich isotopes, offering important benchmarks for refining nuclear models. (aps.org)
- Examples of fluorides include sodium fluoride and calcium fluoride. (cdc.gov)
- Sodium fluoride readily dissolves in water, but calcium fluoride does not. (cdc.gov)
Behave2
- Isotopes that behave in this way are very unusual, according to Chemistry Explained . (livescience.com)
- The isotopes don't behave quite as expected - some decay more readily, some less willingly, than the leading theoretical model predicts. (sciencenews.org)
Cadmium1
- Cadmium/calcium and carbon isotope reconstructions of the glacial northeast Atlantic Ocean. (pangaea.de)
Cesium2
- Tests for strontium are triggered by the presence of cesium isotopes, which have been found in milk from Hilo, Montepelier VT, and Oakland and in precipitation from Boise, Richmond CA, Salt Lake City and a few other cities . (forbes.com)
- Strontium-90 (Sr-90) is the latest of several radioactive isotopes, including tritium, cobalt, and cesium, to be discovered in groundwater wells or soil samples since a leak from the Indian Point 2 spent fuel pool was discovered in August 2005. (riverkeeper.org)
Trace elements1
- Measuring the abundances of diverse trace elements and stable and radiogenic isotopes at micron scales. (whoi.edu)
Atomic1
- Thulium can be isolated byreduction of the oxide with lanthanum metal or by calcium reduction of a closed container.The element is silver-gray, soft, malleable, and ductile, and can be cut with a knife.Twenty five isotopes are known, with atomic masses ranging from 152 to 176. (physlink.com)
Element7
- The new technique makes use of a fact well known to Earth scientists, but seldom used in biomedicine: Different isotopes of a chemical element can react at slightly different rates. (spaceref.com)
- Calcium is a very important element to human physiology , as calcium- phosphate salts form the basis for the creation of bones . (conservapedia.com)
- Calcium in its pure form is referred to as "the white element" and must be kept isolated from air. (conservapedia.com)
- Isotope works on a container element with a group of similar child items. (metafizzy.co)
- They also identified a previously unseen isotope of lawrencium (element 103), a product of the dubnium decay. (aps.org)
- Researchers at Lawrence Berkeley National Laboratory in California saw the isotopes of rutherfordium, seaborgium, hassium, darmstadtium, and copernicium by watching the decay of the yet-to-be-named element 114, a synthetic element first produced about a decade ago. (sciencenews.org)
- One isotope of element 114 lasts 2.7 seconds before decaying - an "eternity," says Heino Nitsche, a nuclear chemist at Lawrence Berkeley. (sciencenews.org)
Ratio1
- To tie the fish to a location, the researchers analysed the strontium isotope ratio for each stream on the east coast of the US. (newscientist.com)
Grams1
- Redcon1 Isotope is an ultra-pure, ultra-premium whey isolate protein that gives you 25 grams of the best protein you can buy! (illpumpyouup.com)
Abundance1
- Where more than one isotope exists, the value given is the abundance weighted average. (rsc.org)
Compounds2
- The determination of radium compounds or specific isotopes is usually accomplished by a separation procedure, followed by quantitative analysis of total radium based on its radioactivity. (cdc.gov)
- Both these compounds contain calcium sulfate in the dihydrated form. (differencebetween.com)
Deposits1
- Consuming too much calcium can lead to kidney stones , which are typically composed of calcium deposits. (conservapedia.com)
Mineral1
- Gypsum is a mineral containing calcium sulfate, and it has the molecular formula CaSO 4 ·2H 2 O. It is one of the most common sulfate minerals. (differencebetween.com)
Elements3
- Calcium is one of the primary elements in bones, shells, etc. (conservapedia.com)
- Another field of research that benefits from the increased intensities of the GSI accelerators is the study of isotopes that play a role in the synthesis of elements in the universe. (gsi.de)
- The isotope Cf-252 is a target material for producing transcalifornium elements. (livescience.com)
Abstract1
- abstract = "OBJECTIVES: Coronary artery calcium (CAC) scores derived from computed tomography (CT) scans are used for cardiovascular risk stratification. (edu.au)
Bones1
- That's similar to what happens with calcium isotopes when bones form. (spaceref.com)
Nuclear reaction1
- Each nuclear reaction created Cf-245 - an isotope with a half-life of about 45 minutes - and a free neutron. (livescience.com)
Laboratory1
- The predicted effect on calcium isotopes is very small, but can be measured using sensitive mass spectrometry methods developed by Morgan as part of her doctoral work with Anbar, Skulan and co-author Gwyneth Gordon, an associate research scientist in the W.M. Keck Foundation Laboratory for Environmental Biogeochemistry at ASU. (spaceref.com)
Gypsum1
- Therefore, both gypsum and phosphogypsum are forms of calcium sulfate. (differencebetween.com)
Neuroendocrine1
- This imaging technique uses a novel isotope, ( 18 F-DOPA), for which neuroendocrine cells have a high affinity, in conjunction with coregistered abdominal CT (see the image below). (medscape.com)
Zinc1
- DTPA comes in two forms: calcium (Ca-DTPA) and zinc (Zn-DTPA). (cdc.gov)
Absorption2
- Animal studies have indicated that calcium absorption is increased by lactulose, a synthetic disaccharide. (tno.nl)
- Therefore, the influence of lactulose on calcium absorption was measured in postmenopausal women who may benefit from the possible enhancing effect of lactulose on calcium absorption. (tno.nl)