Data carbon isotopes. Medical search. Frequent questions

Strategies of amino acid supply in mesozooplankton during cyanobacteria blooms: a stable nitrogen isotope approach. (io-warnemuende.de)
HLY-02-01 Carbon and Nitrogen Isotope Dynamics (ASCII) [Dunton, K. (ucar.edu)

The ratios of these ions are used as criteria for evaluating the data. (cdc.gov)
Additional keyword data blocks ( CALCULATE_VALUES , ISOTOPE_ALPHAS , ISOTOPE_RATIOS ) are available by which molar concentrations can be converted back to standard isotopic units for output. (usgs.gov)
Isotopes of one chemical element differ in their masses, but are naturally present in constant ratios of abundance in gemstones. (ssef.ch)
Model predictions indicated that there is a significant effect of host blood isotope ratios on the rate of stable carbon and nitrogen isotopic discrimination between gnathiids' host blood. (usgs.gov)
Isotope ratios vary with core depth, but when did each variation happen? (icr.org)
The study authors invoked bacterial activity, precipitation of carbonates, and isotope exchange as processes that may have altered the carbon isotope ratios enough to make some of them give wrong ages. (icr.org)

This is a series of exercises designed to introduce undergraduate students to the role of sediments and sedimentary rocks in the global carbon cycle and the use of stable carbon isotopes to reconstruct ancient sedimentary environments. (carleton.edu)
4) Introduce students to the use of organic geochemistry (stable carbon isotopes) for paleoenvironmental interpretations. (carleton.edu)
Depending on time and facilities, collection and analyses of some sediment (or soil) samples for OC content, stable carbon isotopes, and or mineral surface area could be included. (carleton.edu)
Metabolism and foraging strategies of mid-latitude mesozooplankton during cyanobacterial blooms as revealed by fatty acids, amino acids, and their stable carbon isotopes. (io-warnemuende.de)

Afterwards, livers were collected and the natural abundance 13 C-enrichment was determined by compound specific isotope analysis (CSIA) of liver EPA by isotope ratio mass-spectrometry and compared to dietary ALA and DHA 13 C-enrichment. (biomedcentral.com)

Geochemical and compound specific isotope analysis (CSIA)-pH, redox potential, major anions and cations, dissolved gases, and CSIA for both stable carbon and hydrogen. (serdp-estcp.org)
PMID- 19442407 TI - Evaluating the fate of chlorinated ethenes in streambed sediments by combining stable isotope, geochemical and microbial methods. (nih.gov)

12 C and 13 C are measured as the isotope ratio δ13C in benthic foraminifera and used as a proxy for nutrient cycling and the temperature dependent air-sea exchange of CO2 (ventilation). (wikipedia.org)
This is an example of a data processing pipeline for bulk Elemental Analyser Isotope Ratio Mass Spectrometry (EA-IRMS) carbon isotope measurements. (isoverse.org)
This keyword data block is used to identify isotopes of elements and to define the absolute ratio of the minor isotope to the major isotope in the isotope standard. (usgs.gov)
ratio --Absolute mole ratio in the standard of the (minor) isotope to the predominant isotope. (usgs.gov)
The ISOTOPES data block also defines the units of measurement for each isotope and the absolute ratio in the standard of the isotope to the predominant isotope. (usgs.gov)
This ratio is used to convert the isotopic measurement from the units of the standard into moles of isotope in solution. (usgs.gov)
Serum carbon isotope values [13C-to-12C serum carbon isotope ratio (δ(13)C)], which reflect consumption of corn- and cane-based foods, differ between persons consuming high and low amounts of sugar-sweetened beverages (SSBs). (escholarship.org)
Recently, our lab has exploited differences in natural 13 C/ 12 C abundance between dietary ALA and DHA sources combined with compound specific isotope analysis (CSIA) by isotope-ratio mass-spectrometry (IRMS) to determine the origin of mouse brain DHA [ 19 ]. (biomedcentral.com)
Using simultaneous measurements of sinking organic carbon, we find that these organisms could only meet their carbon demand if their carbon : volume ratio were ~ 1 μg C mm−3. (fsu.edu)

This method uses isotope dilution with carbon-13 labeled internal standards. (cdc.gov)
Phytoestrogens are then separated from other urine components by reversed phase HPLC, detected by APPI-MS/MS, and quantified by isotope dilution. (cdc.gov)
Seven polychlorinated dibenzo- p -dioxins (PCDDs), 10 dibenzofurans (PCDFs), 4 non-ortho-substituted or coplanar polychlorinated biphenyls (cPCBs)and 38 ortho-substituted polychlorinated biphenyls (PCBs)are measured in serum by high-resolution gas chromatography/isotope-dilution high-resolution mass spectrometry (HRGC/ID-HRMS). (cdc.gov)
A stable isotope dilution analysis, that was coupled with mass spectrometry, was developed and validated for animal liver and brain. (nih.gov)

Discussion of the role of sediments in the carbon cycle fits well into those general themes. (carleton.edu)
This set of exercises focuses on exploring the role of marine sediments in organic carbon burial and on using the composition of organic carbon preserved in sediments and sedimentary rocks to reconstruct ancient environments. (carleton.edu)
These supposed stages derive from interpretations of isotope differences found in seafloor sediments. (icr.org)

Has 2 halo neutrons Carbon-11 or 11 C is a radioactive isotope of carbon that decays to boron-11. (wikipedia.org)
11 C → 11 B + e+ + ν e + 0.96 MeV 11 C + e− → 11 B + ν e + 1.98 MeV It is produced from nitrogen in a cyclotron by the reaction 14 N + p → 11 C + 4 He Carbon-11 is commonly used as a radioisotope for the radioactive labeling of molecules in positron emission tomography. (wikipedia.org)
Aboveground atomic testing in the 1960s doubled the concentration of radioactive carbon-14 in the atmosphere. (sciencedaily.com)
As plants took up this radioactive carbon, the heightened carbon-14 signature was preserved in the plants and transferred to animals. (sciencedaily.com)
Because radioactive carbon-14 levels have been slowly declining since the 1960s, scientists can use the carbon-14 signature in a bone, tusk or tooth to determine, within about a year, when the material was formed. (sciencedaily.com)
In a tracer substance containing a gamma-emitting isotope, positrons escape from the nuclei of the decaying radioactive atoms with a kinetic energy that drives them through the tissue. (nih.gov)
Cold War above-ground testing of nuclear weapons in the late 1950s and early 1960s caused atmospheric levels of carbon-14 to spike worldwide, generating telltale amounts of this radioactive isotope in the DNA of newly made cells. (nih.gov)

The objective of my research was to explore the use of carbon isotope analysis as a physiological tool to diagnose the nutritional status and potential response of western hemlock to fertilization. (ubc.ca)
Normally cellulose is isolated from wood samples to be analyzed for carbon isotope analysis (expressed as 813C values), but this is a tedious and likely unnecessary process. (ubc.ca)
The analysis of NHANES 2003-2004 laboratory data must be conducted with the key survey design and basic demographic variables. (cdc.gov)
What the carbon isotope values mean rely on comparison and analysis. (nationalgeographic.com)
The exercises include the analysis of data (including making some simple calculations) and formulation of hypotheses. (carleton.edu)
Carbon isotopic analysis of the sediment samples is still ongoing, but we hypothesize that a prevalent excursion in the d13C record will confirm the presence of the PETM and help constrain the exact location of Coryphodon specimens relative to its onset. (confex.com)
Stable isotope and hormone analyses have seen rapid development over the last two decades, and we briefly review established protocols and particular questions emphasized in the literature for each type of analysis in isolation. (frontiersin.org)
Stable isotope analysis of carbon and nitrogen can deliver insights into trophic interactions between organisms. (biomedcentral.com)
Using stable isotope analysis of carbon and nitrogen we provided first data on the trophic position of an acanthocephalan species with respect to its fish host. (biomedcentral.com)
Assessing attribute redundancy in the application of productivity-susceptibility analysis to data-limited fisheries. (iattc.org)
A global meta-analysis of marine predator nitrogen stable isotopes: Relationships between trophic structure and environmental conditions. (iattc.org)
This work was also supported by Grand Valley State University - Student Summer Scholars Program to EA and LB. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. (plos.org)
Stable isotope analysis of consumers and their diets has been widely used in the study of food-webs for decades. (usgs.gov)
However, the amount of information regarding parasite stable isotope ecology is limited, restricting the ability of ecologists to use stable isotope analysis to study parasites in food-webs. (usgs.gov)
As such, general differences in the feeding ecology and trophic positions of the different host species were reflected in their associated gnathiids, indicating that stable isotope analysis of wild caught gnathiids can provide significant details concerning previous hosts. (usgs.gov)

Research effort aiming to calibrate position-specific equilibrium and kinetic isotope fractionation factors for defined processes will help to interpret observed Intra-IDs of a compound accurately and fully. (copernicus.org)
The individual component approach for isotopes posits that each aqueous species containing a minor isotope can have a slightly different equilibrium constant than the major isotope species and that the difference can be related to symmetry numbers and fractionation factors. (usgs.gov)
The MIX_EQUILIBRIUM_PHASES data block is used to simplify the definition of the relationship between fractionation factors and equilibrium constants. (usgs.gov)

Collaborating laboratories analysed concentrations of carbon dioxide and carbon isotopes in the gas that was contained in air bubbles locked in the ice. (europa.eu)
Furthermore, it was demonstrated that iron concentrations varied independently in dust and other crustal elements, indicating that specific elemental tracers might be preferable to total dust or dust proxies when modelling the carbon cycle or dust-related climatic processes, such as the southern ocean biological pump. (europa.eu)
Carey, M. P., O'Donnell, J. A. and Koch, J. C., 2019, Carbon isotope concentrations in stream food webs of the Arctic Network National Parks, Alaska, 2014-2016: U.S. Geological Survey data release, https://doi.org/10.5066/P9NAUIQR . (usgs.gov)
They would need a non-invasive way to measure local tissue concentrations of the tracer isotope. (nih.gov)
David Kuhl, then in the Department of Radiology at the University of Pennsylvania, had built a single-photon scanner that could measure local concentrations of gamma-emitting isotopes in cross sections of human brain by rotating radiation detectors (scintillation probes) around the head. (nih.gov)

The fluxes of barium (a proxy for organic carbon) and CaCO3 also decrease significantly at the time of the major marine plankton extinctions. (usgs.gov)
3) Introduce students to the the importance of the relationship between organic carbon and mineral surfaces, and get them to think about its implications. (carleton.edu)
The seasonal variation in concentration of transparent exopolymer particles (TEPs), particulate organic carbon (POC) and particulate organic nitrogen (PON) were investigated together with floc size and the concentration of suspended particulate matter (SPM) along the cross‐shore gradient, from the high turbid nearshore toward the low‐turbid offshor. (researchgate.net)

NCHS reviewed the data for trends or shifts. (cdc.gov)
Evolutionists used astronomical cycles that assume old ages in the first place to pin long ages onto the isotope shifts. (icr.org)
New multidimensional editing experiments for measurement of amide deuterium isotope effects on Cbeta chemical shifts in 13C, 15N-labeled proteins. (nih.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)
None of the components of glucose (hydrogen, oxygen, and carbon) form gamma-emitting isotopes, so the 2-DG tracer would have to be modified with some element that did. (nih.gov)

1) Make students aware that sedimentary rocks are the primary long-term repository for carbon on Earth, although over the short term only a small amount of terrestrial and marine productivity is preserved. (carleton.edu)

Stable isotope and hormone analyses offer insight into the health, stress, nutrition, movements, and reproduction of individuals and populations. (frontiersin.org)
We identify a fourth area of research, examinations of evolutionary versus ecological drivers of behavior, that could also be well served by a combined stable isotope and hormone analyses approach. (frontiersin.org)
Stable isotope and hormone analyses are two minimally invasive methods that may allow for finer-scale characterization of the severity, types, and consequences of megafaunal responses to their changing environment. (frontiersin.org)
Stable isotope analyses can deliver insights into nutritional relationships between organisms. (biomedcentral.com)
GemTOF conducts high quality elemental analyses, produces multidimensional data, and feeds database for statistical analyses. (ssef.ch)
Although it requires a minute ablation volume at the surface (normally on the girdle) of a gem, GemTOF provides valuable chemical data in addition to traditional gemmological analyses. (ssef.ch)

They are often subjectively tuned against data sets of inorganic tracers and surface chlorophyll and only very rarely against organic components suc. (researchgate.net)

Historically, observed, apparently close-to-equilibrium carbon Intra-ID has prompted an open debate on the nature of biosystems and specifically the pervasiveness of reversible biochemical reactions. (copernicus.org)
Much of the debate remains unresolved, and the discussion has not clearly distinguished between two states of equilibrium: (1) the equilibrium among the corresponding bond-breaking and bond-forming positions in reactant and product and (2) the equilibrium among all carbon positions within a compound. (copernicus.org)
For an organic molecule with multiple carbon positions, equilibrium carbon Intra-ID can be attained only when a specific reaction is in equilibrium and the sources of each position are also in equilibrium with each other. (copernicus.org)
However, a big organic molecule produced by an organism is the result of complex biochemical reactions that involve multiple kinetic isotope effects (KIEs) and equilibrium isotope effects (EIEs). (copernicus.org)
Likewise for heterogeneous reactions between the solution and a gas phase or solid phases, minor-isotope gas or solid components have slightly different equilibrium constants than the major isotope versions. (usgs.gov)
For example, the aqueous model for deuterium is defined with SOLUTION_SPECIES data block and is nearly the same as the aqueous model for H, with the exception that the equilibrium constants are slightly different. (usgs.gov)

No difference was found in leaf carbon isotope discrimination values (σ 13 C) between plants growing in restored and natural sites, suggesting similar water use efficiency. (scielo.br)
Acanthocephalans as absorptive feeders showed lower isotope discrimination values of δ 15 N than the fish host. (biomedcentral.com)
appear to act like predators as it can be seen from their isotope discrimination values. (biomedcentral.com)

This dataset contains measurements of carbon and nitrogen isotopes in biological material collected from three levels in the ocean (POM, plankton, benthos) from the HLY-02-01 cruise. (ucar.edu)
This report discusses measurements on fluid inclusion homogenization temperatures, salinities, and sulfur isotopes. (cdc.gov)

2020. Permafrost hydrology drives the assimilation of old carbon by stream food webs in the Arctic. (usgs.gov)

element or element redox state --Name of an element or element redox state that has two or more isotopes of environmental interest. (usgs.gov)
-isotope --Identifier used to define an isotope of an element or element redox state. (usgs.gov)
isotope name or isotope redox state --An isotope that has been defined as an element or element redox state in SOLUTION_MASTER_SPECIES . (usgs.gov)
The isotope is an isotope of the element or element redox state defined in the preceding Line 1. (usgs.gov)
In the Example data block given in this section, the elements and redox states of D and T are related to the element H and the redox state H(0). (usgs.gov)

The isotope name is usually formed by placing the element name prefixed by the isotopic number in brackets (for example, [13C] for carbon-13), or by special names like D for deuterium and T for tritium. (usgs.gov)

Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). (wikipedia.org)

2021. 'Tidal and Nontidal Marsh Restoration: A Trade-Off Between Carbon Sequestration, Methane Emissions, and Soil Accretion', Journal of Geophysical Research: Biogeosciences, 126: e2021JG006573. (berkeley.edu)
Optimising water use and soil carbon sequestration - can agricultural co-cropping systems provide multiple benefits to address climate change? (abdn.ac.uk)

The project Talos Dome ice core - climate-related variability of iron, carbon dioxide and carbon isotopes in the southern ocean (TDICOSO) involved the study of an Antarctic ice core in order to better understand the dynamics of the climate of the southern ocean. (europa.eu)
The Earth s climate was characterised for the past 800 000 years by fluctuations from glacial, cooler, to interglacial, warmer, conditions, accompanied by variations in the atmospheric content of carbon dioxide and dust as well as in the oceanic content of biota, largely phytoplankton. (europa.eu)
Plants find it easier to use the lighter isotopes (12 C ) when they convert sunlight and carbon dioxide into food. (wikipedia.org)

We also observed seasonal differences in the isotope signatures of fish tissues and acanthocephalans, which were attributed to changes in food composition of the host and to seasonality in the transmission and development of acanthocephalans. (biomedcentral.com)
This study took advantage of distinct differences in the feeding ecology and trophic position of different species of fish known to host the same common micropredatory gnathiid isopod, to study the effects of host stable isotope ecology on that of the associated micropredator. (usgs.gov)

This study provided first data on trophic interaction between an acanthocephalan species and its associated host, which support the tendency already described for other taxa with similar nutrition strategy (e.g. cestodes). (biomedcentral.com)
The results present herein have significant implications for how stable isotopes may be used as a tool to study the trophic dynamics and feeding ecology of gnathiids. (usgs.gov)

The terrestrial Carbon isotopic record has long been used for chemostratigraphic correlation, and to infer paleo-environmental information about terrestrial habitats during geologic history. (confex.com)
Kinetic fractionation can be calculated by using slightly different rates of reaction for minor isotopic components than for major isotope components. (usgs.gov)

Generated inside plants, the carbon isotope becomes preserved in the tissues of herbivores that eat those greens and, further down the line, in the tissues of the carnivores that consume those herbivores. (nationalgeographic.com)
As active feeders they feed on tissues and blood in the body cavity of the host and thus showed isotope discrimination patterns resembling those of predators. (biomedcentral.com)

Reaction calculations with isotopes are performed by assuming each isotope is a separate thermodynamic component. (usgs.gov)

This dataset includes information on the carbon samples that were collected from organic and mineral soils, streams, algae, invertebrates, and fish in the Arctic Network Parks. (usgs.gov)

Stable carbon atoms that have the same atomic number as the element carbon but differ in atomic weight. (nih.gov)

Light isotopes tend to decay into isotopes of boron and heavy ones tend to decay into isotopes of nitrogen. (wikipedia.org)

These programs will be novel in: a their modularity, so that they can be used alone or in concert with related programs, of our group or of our collaborators, via shared files of data, b their comprehensive treatment of stereochemistry, c the close invovlement of the scientist in the problem solving processes of the programs. (nih.gov)

Info: reading file 'ea_irms_example_carbon.cf.rds' with '.cf.rds' reader. (isoverse.org)

Blinded serum samples were assayed for δ(13)C by natural abundance stable isotope mass spectroscopy. (escholarship.org)

Blood engorged juvenile gnathiids were in most cases indistinguishable from their hosts' blood, but significant isotope discrimination was observed for adults. (usgs.gov)

It is expected that information on the source, reaction pathway, and reaction kinetics of an organic compound can be obtained from its position-specific isotope compositions or intramolecular isotope distribution (Intra-ID). (copernicus.org)
and understand isotopes, isomers, logical losses, cleavages and rearrangements to produce a mass spectral fingerprint of the compound. (rsc.org)

With carbon dating, the researchers could determine when the fat cells were created and calculate how long they had survived. (nih.gov)

In geoscience, data distributions are often expressed by a parametric estimation of their PDF, such as, for example, a Gaussian distribution. (researchgate.net)

This is also the only carbon radioisotope found in nature, as trace quantities are formed cosmogenically by the reaction 14 N + n → 14 C + 1 H . The most stable artificial radioisotope is 11 C , which has a half-life of 20.3402(53) min. (wikipedia.org)
The quantitative results of trace elements Magnesium (Mg), Iron (Fe) and Gallium (Ga) are plotted in a three-dimensional scatter plot together with data from a previous study (Halicki, 2013) using LA-ICP-Q-MS on sapphires documented from Kashmir, Sri Lanka and Myanmar of SSEF reference collection with various color saturation. (ssef.ch)
Isotope data were used to trace the advection of northward flowing organic material through the Bering Strait into the Chukchi and Bering Seas. (ucar.edu)

Given these new data, there is no doubt that exchange relationships continued, albeit on a much smaller scale, during the EB III. (plos.org)
In addition, Argo data subsets are used to investigate the physical relationships between the barrier layer and TC intensity, TC translation speed, radial distance from TC center, and time after TC passage. (fsu.edu)

given data is inferred or estimated from periodic trends. (wikipedia.org)

In our experiments, HSQC carbon-proton correlation NMR data with a model that takes intensity information into account improves upon the identification of metabolites that was achieved using COSY proton-proton correlation NMR data with the binary model of [Y. Xi, J.S. de Ropp, M.R. Viant, D.L. Woodruff, P. Yu, Metabolomics, 2 (2006) 221-233]. (nih.gov)

Ongoing research related to method reproducibility and replicability, sample matrix, and data interpretation will be used to optimize these efforts. (serdp-estcp.org)

Spatial and temporal patterns illustrated by these data provide critical insight into how the ecosystem functions.Oceanographic data are analyzed alone and in conjunction with fisheries data for comparisons of water mass characteristics. (noaa.gov)

Additionally, available data revealed different and occasionally contrasting patterns, depending on the parasite's taxonomic position and its degree of development, which is most probably determined by its feeding strategy (absorption of nutrients through the tegument versus active feeding) and its localization in the host. (biomedcentral.com)

The endocannabinoids (EC) 2-arachidonoylglycerol (2-AG) and anandamide (AEA) are important bioactive lipids which share a common carbon chain backbone with the essential fatty acid, arachidonic acid. (nih.gov)

Chesson says that forensic scientists have used the so-called "bomb carbon" signature to estimate the ages of human remains in cold cases and to track the transit time of cocaine from South America to the United States. (sciencedaily.com)

We performed NP inhalation studies with rats to derive quantitative biodistribution data on the translocation of NP from lungs to blood circulation and STOs. (cdc.gov)

An Agilent 7890A GC and 7000A GC/MS Triple Quad were employed for data acquisition. (nih.gov)

units --Units of measurement for the isotope. (usgs.gov)

The presence of a rich Coryphodon fossil record in the Bighorn Basin, WY, provided the opportunity to integrate carbon isotope data with mammalian body size changes. (confex.com)

In this study, scientists used carbon isotopes to determine how the advent of agriculture affected human diets. (biointeractive.org)

Anatomy2

Organisms12

Diseases2

Chemicals and Drugs37

Analytical, Diagnostic and Therapeutic Techniques and Equipment9

Phenomena and Processes30

Disciplines and Occupations2

Anthropology, Education, Sociology and Social Phenomena3

Technology, Industry, Agriculture1

Humanities1

Information Science1

Health Care11

Geographicals1

Nitrogen isotope2

Ratios6

Stable carbon isotopes4

Mass spectrometry and compared1

Geochemical2

Ratio9

Dilution4

Sediments3

Radioactive7

Analysis15

Fractionation factors3

Concentrations5

Organic carbon3

Shifts3

Oxygen2

Repository1

Analyses6

Tracers1

Equilibrium6

Discrimination values3

Measurements2

Hydrology1

Redox5

Deuterium1

Nuclides1

Sequestration2

Dioxide3

Differences2

Trophic2

Isotopic2

Tissues2

Calculations1

Dataset1

Atoms1

Decay1

Processes1

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Experiments1

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