• Stable isotope ratios are measured using mass spectrometry, which separates the different isotopes of an element on the basis of their mass-to-charge ratio. (wikipedia.org)
  • Carbon isotope ratios can also be used to distinguish between marine, freshwater, and terrestrial food sources. (wikipedia.org)
  • Carbon isotope ratios can be measured in bone collagen or bone mineral (hydroxylapatite), and each of these fractions of bone can be analysed to shed light on different components of diet. (wikipedia.org)
  • Eelgrass (Zostera marina) characteristics, sediment grain size distributions, sediment total organic carbon contents (TOC), carbon isotope ratios of sediment organic matter, and total carbon to total nitrogen ratios were measured at four lower intertidal sites in Bellingham Bay, Washington, July 2-5, 2019. (usgs.gov)
  • Bogaard A, Hodgson J, Nitsch E et al (2016) Combining functional weed ecology and crop stable isotope ratios to identify cultivation intensity: a comparison of cereal production regimes in Haute Provence, France and Asturias, Spain. (springer.com)
  • 3. Under laboratory conditions, H. convergens carbon isotope ratios, 13C, changed after its food supply was shifted from a C4- to a C3-based diet of aphids produced on grain sorghum or cotton respectively. (tamu.edu)
  • Final isotope ratios of adult H. convergens were closer to that of the new C3-based diet, with most change in 13C occurring within 3 days after the diet shift. (tamu.edu)
  • 4. The carbon isotope ratios of lady beetle adults collected in cotton fields suggested that grain sorghum was a continuous source for H. convergens until many nearby sorghum fields matured and senesced. (tamu.edu)
  • 5. When cotton aphid (Aphis gossypii Glover) prey were absent, carbon isotope ratios of beetle populations did not change over time and virtually no egg production by H. convergens was detected. (tamu.edu)
  • 6. With cotton aphids present, beetle isotope ratios decreased towards the carbon isotope ratio of cotton, indicating adult feeding in cotton. (tamu.edu)
  • As a result, egg masses produced had carbon isotope ratios in the C3 range of values. (tamu.edu)
  • Trophic fractionation and the effects of diet switch on the carbon stable isotopic "ratios" of pelagic consumers. (limnology-journal.org)
  • 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)
  • 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)
  • Korean mariculture Undaria pinnatifida was collected during the months of January, February, March, and December of 2010, as well as from January of 2011 to investigate the changes in the carbon and nitrogen stable isotope ratios (δ 13 C and δ 15 N) and heavy metal with respect to it growth and to identify the factors that influence such changes. (e-algae.org)
  • In particular, the high δ 15 N of the immature birds in the northeastern area seems to be caused by feeding on 15 N rich diets in the eastern tropical Pacific, off Peru and California, during the northward migration, where occurrence of denitrification with a high nitrogen isotope fractionation factor of up to 1.04 is well known. (int-res.com)
  • Site-specific natural isotope fractionation by NMR. (chipsbooks.com)
  • Nitrogen isotope ratio tended to be relatively lower when nitrogen content in the blade was higher, probably due to the strengthening of isotope fractionation stemming from plenty of nitrogen in the surrounding environment. (e-algae.org)
  • It is known that stable carbon isotope fractionation is associated with the fixation of CO in autotrophic organisms [2]. (lu.se)
  • Isotopic analysis can be used to understand the flow of energy through a food web, to reconstruct past environmental and climatic conditions, to investigate human and animal diets, for food authentification, and a variety of other physical, geological, palaeontological and chemical processes. (wikipedia.org)
  • As such, isotopic analysis makes use of the more resistant phosphate groups, rather than the less abundant hydroxyl group or the more likely diagenetic carbonate groups present. (wikipedia.org)
  • What is an isotope, and what is isotopic analysis? (cosmosmagazine.com)
  • If you're a keen reader of science news , you may have seen the words "isotope" or "isotopic analysis" pop up in a few wildly different articles. (cosmosmagazine.com)
  • Founded on the results from the isotopic analysis, the most commonly consumed foods included plant-based such as eggplants, pears, lentils, garlic, and wheat. (researchgate.net)
  • Modern elemental isotopic analysis informed of the type of diet that ancient Egyptians consumed [8] . (researchgate.net)
  • Juxtaposing the results of this isotopic analysis with the present-day Egyptians' diet, cognate findings Fig. 11 Present-day kariesh cheese originated in ancient Egypt between 3200 and 332 BC. (researchgate.net)
  • This study underlines the potential of isotopic analysis for studies on diet and habitat selection within a pure C(3) plant environment. (nih.gov)
  • 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 researchers' isotopic analysis of both megalithic graves and caves suggests a similar C3 plant-based human diet, mostly consisting of wheat and barley, as well as a substantial amount of protein from cattle and sheep. (eurekalert.org)
  • De Souza CR, Maroco JP, dos Santos TP, Rodrigues ML, Lopes CM, Pereira JS, Chaves MM (2005) Impact of deficit irrigation on water use efficiency and carbon isotope composition (δ 13 C) of field-grown grapevines under Mediterranean climate. (springer.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)
  • Peculiarities in the stable isotope composition of organisms from an alpine lake. (limnology-journal.org)
  • Factors controlling seasonal variations in stable isotope composition of particulate organic matter in a soft water eutrophic lake. (limnology-journal.org)
  • Stable isotope composition (delta(13)C and delta(15)N) of moose (Alces alces) and caribou (Rangifer tarandus) hair from the boreal forest of Jacques-Cartier Park and Cote-Nord (Quebec) and arctic tundra of Queen Maud Gulf and Southampton Island (Nunavut) was investigated as an indicator of dietary preferences and habitat use. (nih.gov)
  • We present novel measurements of the carbon isotope composition of CFC-11 (CCl 3 F), CFC-12 (CCl 2 F 2 ), and CFC-113 (CF 2 ClCFCl 2 ), three atmospheric trace gases that are important for both stratospheric ozone depletion and global warming. (copernicus.org)
  • 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)
  • We submitted individual aliphatic and polycyclic aromatic hydrocarbons in samples of hydrothermal petroleum from Escanaba trough to compound specific isotope analysis to trace their origins. (usgs.gov)
  • The carbon isotope compositions of the alkanes and polycyclic aromatic hydrocarbons (means -27.5 and -24.7%, respectively) reflect a primarily terrestrial organic matter source.We submitted individual aliphatic and polycyclic aromatic hydrocarbons in samples of hydrothermal petroleum from Escanaba Trough to compound specific isotope analysis to trace their origins. (usgs.gov)
  • Several questions remain about the use of bulk calculus as a source of carbon and nitrogen isotope data, however. (uv.es)
  • These two different types of hydrogen atoms are referred to as isotopes of one another. (cosmosmagazine.com)
  • Isotopes are usually referred to with a number that adds their protons and neutrons together - so the neutron-less hydrogen is called 1 H to denote its single proton, while the heaver version is 2 H to indicate there's a neutron there as well. (cosmosmagazine.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)
  • 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)
  • Hydrogen isotopes. (chipsbooks.com)
  • Finally, some isotopes - radioactive isotopes - aren't stable, and break down. (cosmosmagazine.com)
  • If we can figure out how long these radioactive isotopes take to break down, we can use the concentration of isotopes to figure out how old things are. (cosmosmagazine.com)
  • Alpha particle ( ionizing radiation ) - two neutrons and two protons bound as a single particle (a helium nucleus) that is emitted from the nucleus of certain radioactive isotopes in the process of disintegration. (cdc.gov)
  • Background radioactivity - radioactive elements in the natural environment including those in the crust of the earth (like radioactive potassium, uranium, and thorium isotopes) and those produced by cosmic rays. (cdc.gov)
  • Beta particle ( ionizing radiation ) - a charged particle emitted from the nucleus of certain unstable atomic nuclei (radioactive isotopes), having the charge and mass of an electron. (cdc.gov)
  • The radioactive carbon isotope 14 C serves as a tracer, aiding our understanding of disease development. (lu.se)
  • The carbon isotope compositions of the alkanes and polycyclic aromatic hydrocarbons (means -27.5 and -24.7 per mill, respectively) reflect a primarily terrestrial organic matter source. (usgs.gov)
  • Carbon isotope stratigraphy of the St. Clair from an outcrop near Dongola Hollow and from the Schlamer #1 core, both located in Alexander County, Illinois, reveals the presence of the Ireviken (early Sheinwoodian) and Mulde (middle to upper Homerian) carbon isotope excursions. (confex.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)
  • 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)
  • This is all backed up by chemical analyses, including organic carbon isotope analysis clearly pointing to biomass," he said. (livescience.com)
  • Samples analysed by continuous flow isotope ratio mass spectroscopy. (elementallab.co.uk)
  • A commercial interface coupling liquid chromatography (LC) to a continuous-flow isotope ratio mass spectrometry (CF-IRMS) instrument was used to determine the d13C of dissolved organic carbon (DOC) in natural waters. (hal.science)
  • The isotope data indicate that the Ireviken and Mulde are stratigraphically adjacent, suggesting that the middle Wenlock is extremely condensed or missing in these sections. (confex.com)
  • Interpretation of lead isotope data is, however, often contentious and faces numerous instrumental and methodological challenges. (wikipedia.org)
  • Mucus isotope data differed significantly and predictively from muscle data. (springer.com)
  • Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa. (nature.com)
  • Radiogenic isotope studies of inclusions in combination with compositional data can constrain the conditions and timing of diamond growth, and provide fundamental information about the tectono-magmatic processes that led to the formation and modification of the lithospheric keels that underlie the oldest parts of the Earth's continents 1 . (nature.com)
  • To provide constraints on how the tectono-magmatic conditions responsible for harzburgitic diamond formation may have evolved over time, and assess the possible temporal evolution of the Earth's carbon cycle, we present coupled major and trace element and Sm-Nd isotope data for 26 individual garnet inclusions extracted from 26 individual peridotitic diamonds from Venetia, which were also measured for their carbon isotope compositions. (nature.com)
  • The analysis of NHANES 2003-2004 laboratory data must be conducted with the key survey design and basic demographic variables. (cdc.gov)
  • Data analyses will include single and multiple analyses of variance (ANOVA, MANOVA), and non-parametric statistics. (nova.edu)
  • The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. (eurekalert.org)
  • Our results demonstrate that data generated with a family-specific kit do not necessarily have more power than those obtained with a universal kit, but that data generated with different targeted sequencing kits can often be merged for downstream analyses. (frontiersin.org)
  • A site in mid-western Sweden contaminated with chlorinated solvents originating from a previous dry cleaning facility, was investigated using conventional groundwater analysis combined with compound-specific isotope data of carbon, microbial DNA analysis, and geoelectrical tomography techniques. (lu.se)
  • Here we present the results of stable carbon isotope ( δ 13 C) analysis on charred crop seeds from the Bronze Age site of Kaymakçı in western Anatolia. (springer.com)
  • Stable isotope analysis (N and C) of fossil cereal grains is regularly explored as a means of obtaining insights to past crop growing conditions and agricultural practices. (lu.se)
  • Fishes are often utilised in aquatic isotope studies as they structure ecosystems and communities that matter to people, and can cause top-down effects (Kishi et al. (springer.com)
  • Stable isotope tracing of temporal and spatial variability in organic matter sources to freshwater ecosystems. (limnology-journal.org)
  • Analysis of conodont samples from the outcrop and core is ongoing. (confex.com)
  • The DSIM-CRDS system permits the analysis of limited volume (5 - 100-ml) samples ranging six orders-of-magnitude from 100% analyte to the lower limit of instrument detection (2 ppm). (usgs.gov)
  • UW's Stable Isotope Facility recently received an NSF contract to analyze soil samples for the entire NEON network across the United States. (uwyo.edu)
  • The University of Wyoming Stable Isotope Facility (SIF) is now the go-to laboratory to analyze soil samples from all across the country. (uwyo.edu)
  • All soil samples are being sent to UW for carbon and nitrogen isotope analysis. (uwyo.edu)
  • Stable isotope analysis can be executed pre-completion on samples obtained from mud gas and/or gas desorbing from cuttings and core. (onepetro.org)
  • Based on wet chemical oxidation of dissolved organics the LC/IRMS interface allows the on-line injection of small volumes of water samples, an oxidation reaction to produce CO2 and gas transfer to the isotope ratio mass spectrometer. (hal.science)
  • In flow injection analysis (FIA) mode, bulk DOC d13C analysis was performed on aqueous samples of up to 100 mL in volume in the range of DOC concentration in fresh waters (1-10 mg C.L-1). (hal.science)
  • Researchers have recently explored using bulk samples of dental calculus as a substitute for bone and dentine collagen in dietary analyses, because calculus can be sampled without causing damage to the teeth, and may be useful in situations where more destructive analyses are not possible, or where collagen is poorly preserved. (uv.es)
  • The lab also offers stable isotope analysis - δ13C and δ15N for non-cremated bones and other materials, δ18O for carbonates, as well as δ2H + δ18O and δ17O for water samples. (radiocarbon.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)
  • Undertaking a multiple isotope study of these inclusions is now possible, owing to my recent success in significantly improving mass spectrometer detector amplifier technology that led to an order of magnitude improvement in precision for isotope analyses of small samples. (europa.eu)
  • Among samples with the same grow-out period, those that weighed more tended to have higher δ 13 C suggesting a close association between the carbon isotope ratio and growth rate of U. pinnatifida . (e-algae.org)
  • Using this optimized clean up method and carbon isotope analysis, thirty-one samples were screened. (bvsalud.org)
  • Wood anatomical analyses of small samples, such as charcoal fragments, are also performed at the laboratory, and microscopic analyses for species determination can be combined with age determination at the radiocarbon dating laboratory , which is also hosted by the Department of Geology. (lu.se)
  • Environmental samples (such as crops, water, and aerosols) are part of our analysis. (lu.se)
  • 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)
  • Researchers can learn about how much the plant breathes by checking its carbon isotopes. (cosmosmagazine.com)
  • When writing about isotopes, researchers tend to use numbers to distinguish them. (cosmosmagazine.com)
  • Analysis of organic traces preserved in ancient Australian rocks - among Earth's oldest - revealed a "perfect snapshot" of microbial life 3.5 billion years ago, the researchers said in a statement . (livescience.com)
  • With the help of DNA analyses, in 2014 researchers were able to reveal that these farmers arrived as immigrants from the Middle East. (lu.se)
  • The carbon in bone collagen is predominantly sourced from dietary protein, while the carbon found in bone mineral is sourced from all consumed dietary carbon, included carbohydrates, lipids, and protein. (wikipedia.org)
  • Dental calculus is not equivalent to bone collagen for isotope analysis: a comparison between carbon and nitrogen stable isotope analysis of bulk dental calculus, bone and dentine collagen from same individuals from the Medieval site of El Raval (Alicante, Spain). (uv.es)
  • Palaeodietary reconstruction using the carbon and nitrogen isotope values of bone and dentine collagen is a well-established method and the biochemical processes involved are well known. (uv.es)
  • Here we report the comparison of carbon and nitrogen stable isotope analyses of bulk calculus to those from bone and dentine collagen. (uv.es)
  • Salazar García, Domingo Carlos Richards, M.P. Nehlich, O. Henry, A.G. 2014 Dental calculus is not equivalent to bone collagen for isotope analysis: a comparison between carbon and nitrogen stable isotope analysis of bulk dental calculus, bone and dentine collagen from same individuals from the Medieval site of El Raval (Alicante, Spain). (uv.es)
  • Dietary Stable Isotope Analysis (carbon and nitrogen) of bone collagen reveals aspects of past diet. (york.ac.uk)
  • There are also some trace amounts of other isotopes of silicon). (cosmosmagazine.com)
  • Thus, when trace element characteristics and C and Pb stable isotopes ore used in conjunction the sources of elements may be characterised. (bl.uk)
  • In the past year at Cosmos alone, we've mentioned isotopes in articles on geology , astronomy , palaeontology , nuclear science , history , ecology and chemistry . (cosmosmagazine.com)
  • The use of stable isotope analyses in freshwater ecology: current awareness. (limnology-journal.org)
  • Stable isotope (SI) analysis studies rely on knowledge of isotopic turnover rates and trophic-step discrimination factors. (springer.com)
  • Stable isotopes of carbon and nitrogen are incorporated into organisms at differing rates depending on their prey and trophic level. (kansascityzoo.org)
  • 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)
  • Elemental Lab proudly uses products from Elemental Microanalysis in our analysis processes. (elementallab.co.uk)
  • The elemental analyzer produces carbon dioxide and nitrogen gas, which are analyzed for carbon and nitrogen isotopes in an isotope ratio mass spectrometer. (uwyo.edu)
  • The resulting isolates were then analyzed using elemental analyzer-isotope ratio mass spectrometry (EA-IRMS) to measure δ13C values. (bvsalud.org)
  • The objective of our pilot study was to determine whether ultrafine elemental carbon particles translocate to the liver and other extrapulmonary organs following inhalation as singlet particles by rats. (cdc.gov)
  • [14] Either carbon dioxide levels were much higher at the time, providing enough of a greenhouse effect to warm the Earth, or other greenhouse gases were present. (wikipedia.org)
  • Bronk Ramsey C (2009) Bayesian analysis of radiocarbon dates. (springer.com)
  • Aside from radiocarbon dating and stable isotope analysis, Beta Analytic also promoted the geochemical fingerprinting services of its subsidiary, Isobar Science. (radiocarbon.com)
  • The team extracted and sent for radiocarbon analysis small seeds from the track-bearing sediments. (icr.org)
  • Stable isotope turnover rates represent the change in mass and/or time required for consumer tissues to reflect their new diet, allowing the calculation of an isotopic half-life for the tissue and isotope of interest (Boecklen et al. (springer.com)
  • It is not yet clear how much of an individual¿s life span dental calculus represents, what portions of the diet it records, and how diagenesis effects the carbon and nitrogen isotope values of this material. (uv.es)
  • Findings from this analysis suggested that ancient Egyptians followed a mostly vegetarian diet [8] . (researchgate.net)
  • We will explore the utility of using stable isotopes to understand changes in the distribution, diet, and migration patterns of polar bears in the Southern Beaufort Sea. (kansascityzoo.org)
  • 2. Stable carbon isotopes were used in complementary laboratory and field studies to examine colonisation behaviour of an ephemeral agricultural habitat by the lady beetle, Hippodamia convergens Gurin-Mneville. (tamu.edu)
  • Urine specimens are processed, stored, and shipped to the Division of Environmental Health Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention for analysis. (cdc.gov)
  • It is also important for the researcher to know the variations of isotopes within individuals, between individuals, and over time. (wikipedia.org)
  • The procedure involves enzymatic hydrolysis of urine, extraction, derivatization and analysis using capillary gas chromatog-raphy combined with high resolution mass spectrometry (GC-HRMS). (cdc.gov)
  • 13C by isotope ratio mass spectrometry. (cdc.gov)
  • 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)
  • 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)
  • This isn't an Earth-specific thing, either - some US scientists have used isotopes to figure out the origins of different parts of meteorites, for example. (cosmosmagazine.com)
  • In this study, scientists used carbon isotopes to determine how the advent of agriculture affected human diets. (biointeractive.org)
  • Results: The results show that large carbon isotope fractionations occurred for the both terminal and central carbons within propane during pyrolysis. (authorea.com)
  • The isotope fractionations during the pyrolysis are reproducible at optimum conditions, but vary between the two GC-Py-GC-IRMS systems tested, affected by experimental conditions (e.g., pyrolysis temperature, flow rate, and reactor conditions). (authorea.com)
  • Particularly in the Bronze Age Mediterranean, lead isotope analysis has been a useful tool for determining the sources of metals and an important indicator of trade patterns. (wikipedia.org)
  • However, the study surprisingly reveals significant carbon isotope differences between people interred in both funerary site-types. (eurekalert.org)
  • These analyses have been performed on individuals from the El Raval Mudéjar Medieval Cemetery (Eastern Iberia, 15th century A.D.). Although calculus isotope values may be broadly similar to expected values at the population level, we report here no correlation between collagen and bulk dental calculus values at the individual level. (uv.es)
  • Isotope analysis has been particularly useful in archaeology as a means of characterization. (wikipedia.org)
  • 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)
  • Nitrogen isotopes can be used to infer soil conditions, with enriched δ15N used to infer the addition of manure. (wikipedia.org)
  • As a result, we recommend that carbon and nitrogen analysis on bulk dental calculus should only be used as a last resource archaeological dietary marker, if at all. (uv.es)
  • Migratory dynamics and dietary change of sooty shearwaters Puffinus griseus sampled in the North Pacific from May to September in 1990 and 1991 were investigated using the method of δ 13 C and δ 15 N analyses. (int-res.com)
  • We have developed an optimized method to isolate monacolin K/lovastatin from complex RYR dietary supplement matrices to then test for adulteration in RYR supplements using stable carbon isotope (δ13C) analysis. (bvsalud.org)
  • This study also highlights a need of PS isotope standards for propane and other molecules. (authorea.com)
  • Araus JL, Febrero A, Buxó R et al (1997) Identification of ancient irrigation practices based on the carbon isotope discrimination of plant seeds: a case study from the south-east Iberian Peninsula. (springer.com)
  • 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)
  • By applying this huge offset found in recent seeds to the ice age seeds, the 2022 study authors argued that the carbon ages assigned in 2021 were vastly inflated. (icr.org)
  • This activity guides the analysis of a published scientific figure from a study on prehistoric human food sources. (biointeractive.org)
  • 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)
  • MicroRNA sequencing was used to study the effect of CSP on the miRNA expression profile of NAFLD rats, and the target genes of differentially expressed (DE) miRNAs were predicted for further function enrichment analysis. (bvsalud.org)