Study carbon isotope. Medical search. Frequent questions

Oxygenic photosynthesis takes place in plants and microorganisms through different chemical pathways, so various forms of organic material reflect different ratios of 13C isotopes. (wikipedia.org)
In-lake organic carbon produced by algae is distinct from the terrestrial input of organic carbon from the watershed produced by vascular plants, based on their respective C/N ratios. (blogspot.com)
Analysis of stable isotope ratios from mineralised tissue has been widely used for dietary reconstruction. (springer.com)
Tree -ring carbon and oxygen isotope ratios from live and recently dead trees may reveal important mechanisms of tree mortality . (bvsalud.org)
Trophic fractionation and the effects of diet switch on the carbon stable isotopic "ratios" of pelagic consumers. (limnology-journal.org)
In recent decades, the natural abundances of stable carbon and nitrogen isotopes (represented as 13 C/ 12 C and 15 N/ 14 N ratios, respectively) have been widely used to probe biogeochemical and ecological processes. (springeropen.com)
Historically, this field started as early as the 1930s, when a custom-made mass spectrometer was constructed to measure subtle differences in the isotopic ratios of natural carbon (Nier and Gulbransen 1939 ). (springeropen.com)
Araus JL, Santiveri P, Bosch-Serra D, Royo C, Romagosa I (1992) Carbon isotope ratios in ear parts of Triticale. (springer.com)
Ms. Johnson is a member of the Diane M. O'Brien Laboratory and focuses her research on how we can utilize naturally occurring stable isotope ratios in circulating metabolites as biomarkers of dietary intake. (nutrition.org)
Previous related work from the O'Brien Laboratory published in AJCN may be of interest to readers, as well as a related commentary on the use of stable isotope ratios in nutritional epidemiology . (nutrition.org)
Using the whiskers, researchers could do a stable isotope analysis to examine carbon nitrogen ratios. (nps.gov)
The use of stable carbon and nitrogen isotope ratios will help determine these trophic linkages. (nova.edu)
Responses of carbon isotope ratios of C_3 herbs to humidity index in n" by XIANZHAO LIU, QING SU et al. (tubitak.gov.tr)
Other studies analyzed the ratios of carbon isotopes in bulk soil samples to determine the ratio of C3 to C4 plant remains at different soil horizons, which correspond to different geological time periods. (scienceblog.com)
Rather than analyzing plant matter in bulk sediment samples, David Nelson, a postdoctoral researcher in Hu's lab at the time of the study (now a professor at the University of Maryland), analyzed the carbon isotope ratios of individual grains of grass pollen, a technique he pioneered while working with Hu in the lab of biogeochemistry professor Ann Pearson at Harvard University. (scienceblog.com)
In this study, researchers analysed the zinc stable isotope ratios from animal and human teeth from two sites in the Huà Pan Province of Laos: Tam Pà Ling and the nearby site of Nam Lot. (sciencedaily.com)
With zinc stable isotope ratios, we can now study Tam Pà Ling and learn what kind of food our earliest ancestors in this region were eating. (sciencedaily.com)
Outgassing and collisional processing on both worlds led to the production of molecular nitrogen-dominated atmospheres with similar isotopic ratios of hydrogen, carbon, nitrogen and oxygen. (space.com)
Instead, they precisely measure carbon isotope ratios. (icr.org)
Experts must therefore convert the isotope ratios into "ages" using a series of formulas. (icr.org)
Results show that normal (nonpathological) skeletons exhibit limited intraskeletal variation in carbon- and nitrogen-isotope ratios, suggesting that sampling of distinct elements is appropriate for paleodiet studies. (who.int)

This pathway converts inorganic carbon dioxide from the atmosphere or aquatic environment into carbohydrates, using water and energy from light, then releases molecular oxygen as a product. (wikipedia.org)
cellulose extraction and blue-stain fungus on retrospective studies of carbon and oxygen isotope variation in live and dead trees. (bvsalud.org)
Stable isotopes of carbon (δ13C), sulfur (δ34S), oxygen (δ18O), hydrogen (δ2H), nitrogen (δ15N), and radioactive isotope of hydrogen (tritium) have been applied in combination with conventional techniques (chemical) to investigate Karachi coastal water pollution due to Layari and Malir rivers, which mainly carry the domestic and industrial wastewater of Karachi Metropolitan. (intechopen.com)
In this study we assess the integrated biostratigraphic and chemostratigraphic framework for the Ordovician sequence at Lanna, utilizing trilobites and conodonts coupled with bulk-rock carbon and oxygen isotopes (δ 13 C carb and δ 18 O carb ). (lu.se)
During this period, oxygen- and volatile-rich materials from the outer solar system were hurled en masse towards the inner solar system. (space.com)
Trigo-Rodriguez and Martin Torres studied how hydrogen, carbon, nitrogen and oxygen isotopes reacted with their environments on Earth and Titan. (space.com)
In this study, we address the relation between carbon and oxygen stable isotopes of cork rings and precipitation and temperature, in two distinct locations of southwestern Portugal-the (wetter) Tagus basin peneplain and the (drier) Grândola mountains. (unl.pt)
We aimed at assessing whether the two climatic factors affect cork-ring isotopic composition under contrasting conditions of water availability, and, therefore, if carbon and oxygen signatures in cork can reflect tree functional (physiological and structural) responses to stressful conditions, which might be aggravated by climate change. (unl.pt)
Samples were analyzed to determine the ratio of strontium to calcium, along with levels of the isotopes carbon-13 and oxygen-18. (bibliotecapleyades.net)
Variations in temperature, moisture and a number of other environmental properties may be recorded as changes in ring width but also, for example, as changes in the stable carbon- and oxygen-isotope composition of wood samples. (lu.se)
The shells are made of calcium carbonate, which means that they mainly consist of the elements calcium, carbon and oxygen. (lu.se)
Elements exist in different variations - isotopes - and it is the proportion of oxygen isotopes in the foram shells that, for example, reveals changes in global temperature and in global ice volume. (lu.se)
The proportion of oxygen isotopes in the shells reveals changes in global temperature and in global ice volume. (lu.se)
The temperature can be recreated by looking at the relationship between different oxygen isotopes (that is, different kinds of oxygen atoms). (lu.se)
Ice and water normally have different distributions of the different oxygen isotopes, so it is possible to see that the balance has varied if there has been a lot of ice (cold climate) or lots of water (warm climate). (lu.se)

Understanding these variations in carbon fractionation across species is applied in isotope geochemistry and ecological isotope studies to understand biochemical processes, establish food chains, or model the carbon cycle through geological time. (wikipedia.org)
Wiederhold, J. G. Metal stable isotope signatures as tracers in environmental geochemistry. (nature.com)
Validation of the correlation between Niobrara and Codell production GOR and stable isotope composition was provided by an independent geochemistry dataset from the USGS. (onepetro.org)
Although the carbon and nitrogen isotopic compositions of diverse types of organic matter were measured and discussed by the pioneers of isotope geochemistry (e.g. (springeropen.com)

These results demonstrate the potential of natural gas stable isotope signatures as a useful and reliable fluid quality prediction tool. (onepetro.org)

Stable isotope analyses compares the ratio (δ) between these two isotopes so that increased productivity is reflected by an increase in the δ 13 C of organic matter in Lake Baikal sediments. (blogspot.com)
The use of stable isotope analyses in freshwater ecology: current awareness. (limnology-journal.org)
This project builds on existing expertise in isotope analyses at the University of Alberta. (kansascityzoo.org)
To reconstruct the paleo-environmental conditions near an ancient fortress from Napatantimesin the first millennium BC a 6m deep soil profile in the Sudanese desert was studied using 14 C-dating and stable C isotope analyses. (rupestre.net)

Factors controlling seasonal variations in stable isotope composition of particulate organic matter in a soft water eutrophic lake. (limnology-journal.org)

Photosynthesis converts carbon dioxide to carbohydrates via several metabolic pathways that provide energy to an organism and preferentially react with certain stable isotopes of carbon. (wikipedia.org)
The overall equation for the light-dependent reactions is generally: 2 H2O + 2 NADP+ + 3 ADP + 3 Pi + light → 2 NADPH + 2 H+ + 3 ATP + O2 The light-independent reactions undergo the Calvin-Benson cycle, in which the energy from NADPH and ATP is used to convert carbon dioxide and water into organic compounds via the enzyme RuBisCO. (wikipedia.org)
Carbon isotopes characterize rapid changes in atmospheric carbon dioxide during the last deglaciation. (nature.com)
CHAMPAIGN, Ill. - According to a popular hypothesis, grasses such as maize, sugar cane, millet and sorghum got their evolutionary start as a result of a steep drop in atmospheric carbon dioxide levels during the Oligocene epoch, more than 23 million years ago. (scienceblog.com)
C4 plants are more efficient than C3 plants at taking up atmospheric carbon dioxide and converting it into the starches and sugars vital to plant growth. (scienceblog.com)
This means these grasses were present 32 to 34 million years ago, well before studies indicate atmospheric carbon dioxide levels made their precipitous decline. (scienceblog.com)
With atmospheric carbon dioxide levels now on the increase, he said, "there are also implications about how C3 and C4 plants will fare in the future. (scienceblog.com)
Distribution of Subsurface Carbon Dioxide Ice at Different Obliquities. (open.ac.uk)
The Penetration of Solar Radiation into Water and Carbon Dioxide Snow, with reference to Mars. (open.ac.uk)
The Penetration of Solar Radiation into Carbon Dioxide Ice. (open.ac.uk)
According to Chris McKay, a planetary scientist at NASA's Ames Research Center, comets may have made small contributions to the water, carbon dioxide, and nitrogen content of the Earth's early atmosphere, "but they were not the main source. (space.com)
Then we can see how temperature and carbon dioxide levels have developed, and how the climate has varied between ice ages and warm periods over the past 150,000 years. (lu.se)
You will have the chance to pull up a core sample from the glaciers in Greenland and carry out measurements to read the temperature and carbon dioxide levels for the past 150 000 years. (lu.se)
To uncover historical climate data, researchers look at air bubbles preserved in the ice that contain 'old air' - by measuring the levels of carbon dioxide in these bubbles it is possible to compare historical levels with current carbon dioxide levels in the atmosphere (we currently have approximately 400 ppm CO 2 ). (lu.se)
Detailed knowledge about how climate and human activities influence the sources and sinks of greenhouse gases like carbon dioxide and methane is needed in order to make the informed and effective decisions needed for combating climate change. (lu.se)

The degree of carbon isotope fractionation is influenced by several factors, including the metabolism, anatomy, growth rate, and environmental conditions of the organism. (wikipedia.org)
Understanding these variations in carbon fractionation across species is useful for biogeochemical studies, including the reconstruction of paleoecology, plant evolution, and the characterization of food chains. (wikipedia.org)
Isotope fractionation due to Rubisco (form I) carboxylation alone is predicted to be a 28‰ depletion, on average. (wikipedia.org)
This fractionation enables the use of stable nitrogen isotopes (δ 15 N) to infer trophic level, and high δ 15 N recorded in bone collagen usually indicates high-protein diets (Sponheimer et al. (springer.com)
It is known that stable carbon isotope fractionation is associated with the fixation of CO in autotrophic organisms [2]. (lu.se)

However factors other than primary productivity can influence the carbon isotopic composition of in-lake produced organic matter, such as the concentration of atmospheric CO 2 , lake-water pH, temperature, nutrient limitation and algal growth rates. (blogspot.com)
Peculiarities in the stable isotope composition of organisms from an alpine lake. (limnology-journal.org)
The carbon isotopic composition of an organism mainly reflects its dietary signature (DeNiro and Epstein 1978 ), and coordinated isotopic measurements of organisms provide a unique approach to describing the dietary habits of animals, a macroscale ecological phenomenon. (springeropen.com)
Grip strength and body composition measurements were taken, and ambient solar UV radiation was monitored in both study sites. (cdc.gov)

The lighter isotope has a higher energy state in the quantum well of a chemical bond, allowing it to be preferentially formed into products. (wikipedia.org)
During photosynthesis algae take up carbon, but they prefer to take up the lighter isotope ( 12 C) rather than the heavier ( 13 C) because the former is easier to utilise. (blogspot.com)

Pleistocene atmospheric CO 2 variations must involve changes in ocean storage of carbon, but the mechanisms and pathways of carbon transfer between the oceanic and atmospheric reservoirs are poorly understood due, in part, to complications associated with interpretation of carbonate system proxy data. (nature.com)
Coccolith chemistry reveals secular variations in the global ocean carbon cycle? (google.fr)
State-based differences in pediatric cancer incidence could guide interventions related to accessing care (e.g., in states with large distances to pediatric oncology centers), clinical trial enrollment, and state or regional studies designed to further explore variations in cancer incidence. (cdc.gov)

Additionally, the human samples have higher stable isotope differences, in comparison with faunal samples, than would be expected within the food web, particularly for δ 13 C. This human bone collagen δ 13 C enrichment may reflect a diet rich in aquatic protein intake, which is also supported by δ 34 S archived in human and faunal samples, and the presence of oysters and cockles shells at the excavation. (springer.com)
To further investigate the meaning behind different burial practices within the same location and period, the authors of the present study analyzed the bone collagen carbon and nitrogen isotope measurements of 166 individuals from a series of broadly contemporary Late Neolithic (3500 to 2900 cal BC) mortuary monuments and caves, closely situated together in north-central Spain. (eurekalert.org)
In our study we examined stable carbon and nitrogen isotopes in polar bear bone collagen. (yahoo.com)
Based on these results, we suggest that paleodiet researchers avoid sampling collagen at or close to lesion sites because the isotope values may be reflecting both altered metabolic processes and differences in diet relative to others in the population. (who.int)

Further data for radioisotopes (radioactive isotopes) of carbon are listed (including any which occur naturally) below. (webelements.com)
The radioactive carbon isotope 14 C serves as a tracer, aiding our understanding of disease development. (lu.se)

C-13 is used for instance in organic chemistry research, studies into molecular structures, metabolism, food labeling, air pollution and climate change. (webelements.com)
However, so far, tree functional attributes and physiological strategies, namely photosynthetic metabolism adjustments affecting cork formation, have never been addressed and/or integrated on these previous cork-rings-based studies. (unl.pt)
A variety of imaging modalities, including structural and functional magnetic resonance imaging (MRI) and positron emission tomography (PET) studies of cerebral metabolism, have shown characteristic changes in the brain of patients with Alzheimer disease in prodromal and even presymptomatic states. (medscape.com)

The ratio between these isotopes varies in biological organisms due to metabolic processes that selectively use one carbon isotope over the other, or "fractionate" carbon through kinetic or thermodynamic effects. (wikipedia.org)
Therefore, in addition to comparing δ 13 C values, the carbon to nitrogen ratio (C/N) of the organic matter can be of used to quantify/assess algal versus higher plant (e.g. terrestrial) production. (blogspot.com)
Phytoplankton functional traits and seston stable isotopes ratio: a functional-based approach in a deep, subalpine lake, Lake Maggiore (N. Italy). (limnology-journal.org)
Using a spooling-wire micro-combustion device to combust the grains, and an isotope mass spectrometer to determine the relative ratio of C-12 and C-13 in the sample, Nelson and Illinois graduate student Michael Urban analyzed hundreds of individual grains of grass pollen collected from study sites in Spain and France. (scienceblog.com)
We also need to assume a value for the carbon isotope ratio in the atmosphere at that time. (icr.org)
2 This newer study measured the carbon isotope ratio in seeds of the same plant, but these were harvested and archived in 1947. (icr.org)
13C by isotope ratio mass spectrometry. (cdc.gov)

Fig. 2: In situ growth of isotope nanodomains. (nature.com)
New technology introduced to the Canadian Center for Isotopic Microanalysis at the University of Alberta (Canadian Foundation for Innovation) allows fine-scale (1-30 microns) in situ sampling of isotopes within samples (i.e., hair and claws). (kansascityzoo.org)

Gas exchange measurements simultaneously with modulated chlorophyll fluorescence were used to study the response of the ear and flag leaf to CO 2 and O 2 during photosynthesis. (springer.com)
Araus JL, Brown HR, Febrero A, Bort J, Serret MD (1993a) Ear photosynthesis, carbon isotope discrimination and the contribution of respiratory CO 2 to differences in grain mass in durum wheat. (springer.com)
C3 and C4 refer to the number of carbon atoms in the first molecular product of photosynthesis. (scienceblog.com)

Using carbon and nitrogen stable isotope analysis of human and animal remains, our study has identified meaningful differences between those buried in caves and megalithic graves in the Late Neolithic of north-central Spain," says Teresa Fernández-Crespo. (eurekalert.org)
The key to the authors' approach lies in carbon and nitrogen stable isotopes, chemicals that exist in animal tissues, which vary depending on diet. (eurekalert.org)

Different organisms fix carbon through different mechanisms, which are reflected in the varying isotope compositions across photosynthetic pathways (see table below, and explanation of notation in "Carbon Isotope Measurement" section). (wikipedia.org)
Carbon and nitrogen are essential elemental constituents of organisms and form various chemical species on Earth. (springeropen.com)
Stable isotopes of carbon and nitrogen are incorporated into organisms at differing rates depending on their prey and trophic level. (kansascityzoo.org)

As our knowledge of the distributions of carbon and nitrogen isotopes in organic matter and the factors controlling them has accumulated, the scope of isotopic measurements has greatly expanded. (springeropen.com)
Measurements of naturally occurring stable isotopes in animal tissues can be used to monitor the diets of wide-ranging species, such as polar bears, that cannot be directly observed. (kansascityzoo.org)
Numerous studies are under way to identify specific imaging markers for different types of dementia, including cerebral volumetric measurements, diffusion imaging, spectroscopy, very-high-field MRI scans of senile plaques, and PET scan markers of senile plaques. (medscape.com)

Carbon isotopes in lake sediments can be used to compare algal growth rates (i.e. productivity) under different nutrient dynamics while silicon isotopes tell us specifically about the cycling of silicon (a key nutrient) in the lake over time. (blogspot.com)
A 2021 study had assigned an age of about 22,000 carbon years to sediments that hold mammoth, giant sloth, and human footprints found in the ancient Lake Otero Basin. (icr.org)
Interdisciplinary study of lacustrine sediments from Southeastern São Paulo state (Brazil). (usp.br)

How do carbon isotopes infer past primary productivity? (blogspot.com)

Stable carbon (δ¹³C) and hydrogen (δ²H) isotopes have been used to characterize hydrocarbons for exploration, development and production since the 1960s, and have re-emerged as predictive tools with the development of unconventional "tight" oil and gas plays. (onepetro.org)

Maturities derived from carbon and hydrogen isotopes can serve as controls in regional maturity maps, which are used to help define areas of oil, wet gas and dry gas production. (onepetro.org)
Stable carbon and hydrogen isotope values show a strong correlation to both initial and cumulative GOR for the unconventional Niobrara and Codell intervals of Wattenberg Field. (onepetro.org)

The spatial resolutions of even the most sensitive isotope analysis techniques based on light or ion probes are limited to a few hundred nanometres. (nature.com)
Isotope analysis in the transmission electron microscope. (nature.com)
Stable isotope analysis can be executed pre-completion on samples obtained from mud gas and/or gas desorbing from cuttings and core. (onepetro.org)
Seasonal changes in the importance of the source of organic matter to the diet of zooplankton in Loch Ness, as indicated by stable isotope analysis. (limnology-journal.org)
An important application of the analysis of carbon and nitrogen isotopic compositions is in ecological studies. (springeropen.com)
This activity guides the analysis of a published scientific figure from a study on prehistoric human food sources. (biointeractive.org)
An isotopic analysis of megalithic graves and caves in Spain may suggest the existence of a degree of differentiation in the lifeways of people buried in these different funerary sites, according to a study published September 27, 2017 in the open-access journal PLOS ONE by Teresa Fernández-Crespo and Rick Schulting from the University of the Basque Country, Spain, and the University of Oxford, UK. (eurekalert.org)
The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. (eurekalert.org)
Basically, Stable isotope analysis is based on the principle 'you are what you eat. (kansascityzoo.org)
An international team of scientists has now applied a new method to investigate the diet of fossil humans: the analysis of stable zinc isotopes from tooth enamel. (sciencedaily.com)
Nitrogen isotope analysis, in particular, can help scientists learn if past humans were eating animals or plants. (sciencedaily.com)
New methods -- such as zinc isotope analysis of enamel -- can now overcome these limitations and allow us to investigate teeth from regions and periods we could not study before," says study leader Thomas Tütken, professor at the Johannes Gutenberg University's Institute of Geosciences. (sciencedaily.com)
Another kind of analysis performed in this study -- stable carbon isotopes analysis -- indicates that the food consumed came strictly from forested environments," says Élise Dufour, researcher at the National Natural History Museum of Paris. (sciencedaily.com)
Published in the journal Biology 's special issue, Applications of Stable Isotope Analysis in Ecology, Dr. Jack Hopkins, President and Associate Professor of the Center for Wildlife Studies and colleagues describe a novel technique to prevent laundering one of Maine's imperiled species, the wood turtle. (eurekalert.org)
Elemental (Total Organic Carbon TOC and Total Organic Nitrogen), isotopic (C and N), pollen analysis and radiocarbon dating were integrated on this work. (usp.br)

Nelson MA, Quakenbush LT, Mahoney BA, Taras BD, Wooller MJ (2018) Fifty years of Cook Inlet beluga whale feeding ecology from isotopes in bone and teeth. (uaf.edu)

Rapid shifts in circulation and biogeochemistry of the Southern Ocean during deglacial carbon cycle events. (nature.com)
This study investigates natural variation in C and N stable isotopes among plant species in two western Amazon flooded forests with contrasting watershed biogeochemistry (white-water várzea-forest and black-water igapó-forest). (scielo.br)

Stable isotope labeling by amino acids in cell culture, SILAC, as a simple and accurate approach to expression proteomics. (nature.com)
The isotopic distributions of carbon and nitrogen in a single organism as well as in the whole biosphere are strongly regulated, so that their major components such as amino acids are coordinated appropriately rather than controlled separately. (springeropen.com)
We dive deep into this really novel study, touching on stable isotopes, controlled feeding trials, essential and non-essential amino acids, and emerging biomarkers of intake for use in experimental and observational nutrition studies. (nutrition.org)

Here we show the unambiguous isotopic imaging of 12 C carbon atoms embedded in 13 C graphene and the monitoring of their self-diffusion via atomic-level vibrational spectroscopy. (nature.com)

However, the study surprisingly reveals significant carbon isotope differences between people interred in both funerary site-types. (eurekalert.org)

The method of α- cellulose extraction, whether Leavitt-Danzer or Standard Brendel modified for small samples, imparts significant differences in the Î´(13)C (up to 0.4 ) and Î´(18) O (up to 1.2 ) of α- cellulose , as reported by other studies. (bvsalud.org)
Further research on tooth dentine and enamel will explore the age at which the isotopic differences first appeared and investigate different patterns of mobility and landscape-use in the study area. (eurekalert.org)
Our results indicate differences between the study areas. (unl.pt)
In contrast, individuals with osteomyelitis, healed fractures, and osteoarthritis exhibit significant intraskeletal differences in isotope values, depending on whether one is comparing lesions to near or to distant sites. (who.int)
Skeletons with periostitis result in significant intraskeletal differences in nitrogen isotope values only, while those with rickets/osteomalacia do not exhibit significant intraskeletal differences. (who.int)

Organic carbon contains less of the stable isotope Carbon-13, or 13C, relative to the initial inorganic carbon from the atmosphere or water because photosynthetic carbon fixation involves several fractionating reactions with kinetic isotope effects. (wikipedia.org)
In contrast, at the drier site, trees use water from deeper ground layers, depleted in 18O, and strongly regulate stomatal conductance under water stress, thus reducing photosynthetic carbon uptake and probably relying on stored carbon reserves for cork ring formation. (unl.pt)

Freshwater fish exhibit variation in δ 13 C depending on the ecosystem as freshwater plants have numerous sources of carbon, unlike terrestrial plants (Zohary et al. (springer.com)
A study from NASA s Goddard Space Flight Center in Greenbelt, Maryland looking at climate data over the past century has concluded that solar variation has made a significant impact on the Earth's climate. (bibliotecapleyades.net)

We review the biochemical and physiological bases of the use of carbon and nitrogen isotopic compositions as an approach for environmental and ecological studies. (springeropen.com)
Studies in environmental science. (cdc.gov)
How does environmental change affect carbon, nutrient, and water fluxes in ecosystems? (wsl.ch)
These results suggest that although stable isotopes signatures in cork rings are not proxies for net growth, they may be (fairly) robust indicators of trees' physiological and structural adjustments to climate and environmental changes in Mediterranean environments. (unl.pt)
Our research group focuses on environmental radiology, specifically studying the release of radionuclides from various sources. (lu.se)

To develop the model, co-authors Drs. Matt Chatfield and Cheryl Frederick collected claw tips from 35 wild wood turtles in Maine and compared their isotopes with those of 36 captive turtles throughout the eastern U.S. Because captive and wild turtles have drastically different diets, the isotopic signatures of their tissues were also expected to differ. (eurekalert.org)

The project may be the first time a coyote's diet is being studied in downtown Los Angeles, and it is expected to yield information about the basic ecology of urban coyotes, which it is hoped will assist residents and policymakers in making informed decisions regarding coyote management. (nps.gov)

We first grow a domain of 12 C carbon atoms in a pre-existing crack of 13 C graphene, which is then annealed at 600 degrees Celsius for several hours. (nature.com)
Using scanning transmission electron microscopy-electron energy loss spectroscopy, we obtain an isotope map that confirms the segregation of 12 C atoms that diffused rapidly. (nature.com)
Our results demonstrate the high mobility of carbon atoms during growth and annealing via self-diffusion. (nature.com)
Fig. 4: Self-diffusion of carbon atoms in graphene. (nature.com)
Carbon-14 ( 14 C) atoms are like needles in carbon-12 haystacks. (icr.org)

To investigate changes in Lake Baikal's primary productivity, we are analysing organic carbon (δ 13 C organic ) and silicon (δ 30 Si) isotopes at the BGS. (blogspot.com)
Humus destruction was not necessary due to low organic carbon concentration. (rupestre.net)

and (3) traces water, carbon, and nitrogen fluxes using stable isotopes. (wsl.ch)

The results of this study are expected to yield ecological information pertinent to better understanding the overall contribution of seagrasses in these communities. (nova.edu)

Using this discovery, the author proposes an explanation for the major unresolved problem in sapropel studies, namely the source of nutrient supply required for export productivity to reach levels needed for sustained sapropel deposition. (soton.ac.uk)

Spatiotemporal dynamics of C and N isotopic signature of zooplankton: a seasonal study on a man-made lake in the Mediterranean region. (limnology-journal.org)
durum ) were studied in plants grown under greenhouse and Mediterranean field conditions. (springer.com)
In addition, the study provides a first quantitative estimate of the diffusive (1/e) mixing time scale for the eastern Mediterranean in its "stratified" sapropel mode, which is of the order of 450 years. (soton.ac.uk)

RuBisCO catalyzes the reaction between a five-carbon molecule, ribulose-1,5-bisphosphate (abbreviated as RuBP) and CO2 to form two molecules of 3-phosphoglyceric acid (abbreviated as PGA). (wikipedia.org)
In addition, the histological distribution of Rubisco protein in the ear parts was studied by immunocytochemical localisation. (springer.com)

A new study overturns that hypothesis, presenting the first geological evidence that the ancestors of these and other C4 grasses emerged millions of years earlier than previously established. (scienceblog.com)
The forams are the favourite microfossil of many scientists who are studying the geological history of our planet, or who are looking into effects of past events of rapid climate change. (lu.se)

This study is the first of its kind to analyse carbon, nitrogen and sulphur stable isotope data from skeletons of the eleventh-seventeenth centuries in Portugal. (springer.com)

The researchers announced their findings in a study published in Quaternary Research in 2021. (livescience.com)
This means that researchers will find many microfossils to study in the area. (lu.se)
BECC researchers study how direct and indirect human impacts on the climate and ecosystems influence biodiversity and ecosystem functioning from local to global scales, and how knowledge about these dynamics may inform mitigation and adaptation decisions in the face of such changes. (lu.se)

Scientists at Santa Monica Mountains National Recreation Area have been studying carnivores in and around the Santa Monica Mountains since 1996. (nps.gov)
In this study, scientists used carbon isotopes to determine how the advent of agriculture affected human diets. (biointeractive.org)
Professor H. Nishihara is one of active scientists on carbon materials. (shinshu-u.ac.jp)

It will be interesting, in the future, to compare our zinc isotope data with data from other prehistoric human species of Southeast Asia, like Homo erectus and Homo floresiensis , and see if we could understand better why they went extinct while our species survived," concludes first author Nicolas Bourgon, a researcher at the Max Planck Institute for Evolutionary Anthropology. (sciencedaily.com)

2 of biomass from inorganic carbon [2]. (lu.se)

Using stable isotopes of carbon and nitrogen preserved in these two tissues, we will examine ecosystem dynamics relative to sea ice conditions, climate indices, and population trends. (kansascityzoo.org)
We can assess the relative importance of these two sources through the stable isotopes incorporated into the tissues of animals. (yahoo.com)

This study investigates diet in a town ruled by religious military orders and how the general population diet may have adapted to religious dietary restrictions. (springer.com)
This study offers new insights into different mortuary practices and specifically how they related to lifeways, particularly dietary and subsistence practices, and implications for the emergence of socioeconomic inequality in the Western European Neolithic. (eurekalert.org)
While most of the assessments were successful, future studies would likely require different dietary intake instruments. (cdc.gov)

Although the scatter in numeric values is relatively large, long-term δ 18 O trends are overall consistent at the global scale, tentatively supporting the notion that climate cooled during the studied time interval. (lu.se)
This study exploits new methods but it is hoped that the results will explore how climate change affects foraging success and movement patterns of polar bears and may provide insight into the decline in polar bear body condition associated with demographic changes and the documented population decline. (kansascityzoo.org)
By measuring the delta^{13}C of a large number of C_3 herbaceous plants growing in different climate zones in northern China and collecting early reported delta^{13}C values of C_3 herbs in this study area, the spatial features of delta^{13}C values of C_3 herbs and their relationships with humidity index were analyzed. (tubitak.gov.tr)
Our recently published study in Anthropocene demonstrates a much more substantial impact to polar bears resulting from recent climate change compared to observations over the last 4,000 years. (yahoo.com)
Studying it provides a window into the past and the future by showing how it responded to previous climate change events. (livescience.com)
Studying the permafrost from immediately before and after that period could reveal more about modern-day climate change. (livescience.com)
Singer tells Daily Tech that this new study provides further evidence for a 1500-year Climate cycle, the evidence for which was first discovered in ice core data. (bibliotecapleyades.net)
Much of what we know today about the climate far back in time, we have learned by studying "drill cores", a kind of historical climate archive, which can be obtained by drilling deep into the ice in, for example, Greenland or Antarctica. (lu.se)
At the ice core drilling station, you will learn how to study climate change through history. (lu.se)
The station is based on current research on climate change and includes a film in which researcher Jesper Sjolte from the Department of Geology in Lund talks about the studies on the ice in Greenland. (lu.se)
LUCCI was a research centre at Lund University devoted to studies of the carbon cycle and how it interacts with the climate system. (lu.se)
Working together in a creative cross-disciplinary environment, our goals are to increase the understanding of how the carbon cycle and climate system function and interact, and to disseminate our findings to society. (lu.se)
Although progress has been made in our understanding of the carbon cycle and climate there are several fundamental science questions that remain unanswered and that are pivotal for an increased understanding of the Earth System as well as for our ability to predict future changes through modeling. (lu.se)

The results of the study will be analyzed in the coming weeks and biologists expect to submit the results for publication this year. (nps.gov)

The datasets generated and/or analysed during this study are provided with the paper as source data. (nature.com)
Richards and Hedges 1999 ), especially when combined with carbon isotope data. (springer.com)
Further data for naturally occuring isotopes of carbon are listed above. (webelements.com)
This omnivorous diet also differs from most nitrogen isotope data of humans in other regions of the world for that time period, where a meat-rich diet is almost consistently discerned. (sciencedaily.com)
This article reports the study design, methodological issues and early results of a pilot study testing methods for collecting nutrition, physical activity, and ultraviolet (UV) radiation exposure data in a groundbreaking study in China. (cdc.gov)
Prior to launching a large-scale follow-up effort, a pilot study was conducted to assess the feasibility of recontacting original study participants to collect extensive diet, physical activity, and UV radiation exposure data in this population. (cdc.gov)

This table shows information about naturally occuring isotopes , their atomic masses , their natural abundances , their nuclear spins , and their magnetic moments . (webelements.com)
Isotope abundances of carbon. (webelements.com)
This is not to be confused with the relative percentage isotope abundances which totals 100% for all the naturally occurring isotopes. (webelements.com)
Because we analyze carbon isotopes in a material unique to grasses (pollen) we were able to detect C4 grasses at lower abundances than previous studies," Nelson said. (scienceblog.com)

We utilize accelerator mass spectrometry ( 14 C-AMS) to study the impact of mid-century nuclear weapons tests. (lu.se)

Stable isotope tracing of temporal and spatial variability in organic matter sources to freshwater ecosystems. (limnology-journal.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

Ratios21

Oxygen15

Geochemistry4

Stable isotope signatures1

Analyses4

Particulate organic matter1

Dioxide15

Fractionation5

Composition4

Lighter isotope2

Variations3

Collagen4

Radioactive2

Metabolism3

Ratio7

Situ2

Photosynthesis3

Nitrogen stable2

Organisms3

Measurements3

Sediments3

Infer1

Characterize1

Hydrogen2

Analysis15

Bone1

Biogeochemistry2

Amino acids3

Vibrational1

Reveals1

Differences5

Photosynthetic carbon2

Variation2

Environmental5

Signatures1

Ecology1

Atoms5

Organic-carbon2

Fluxes1

Ecological1

Nutrient1

Mediterranean3

Rubisco2

Geological2

Skeletons1

Researchers3

Scientists3

Prehistoric human1

Inorganic1

Tissues2

Dietary3

Climate13

Publication1

Data6

Abundances4

Mass1

Spatial1