• Isotopic reference materials are compounds (solids, liquids, gasses) with well-defined isotopic compositions and are the ultimate sources of accuracy in mass spectrometric measurements of isotope ratios. (wikipedia.org)
  • Due to their critical role in measuring isotope ratios, and in part, due to historical legacy, isotopic reference materials define the scales on which isotope ratios are reported in the peer-reviewed scientific literature. (wikipedia.org)
  • While the δ values of references are widely available, estimates of the absolute isotope ratios (R) in these materials are seldom reported. (wikipedia.org)
  • δ X = x / y R s a m p l e x / y R r e f e r e n c e − 1 {\displaystyle \delta ^{X}={\frac {^{x/y}R_{sample}}{^{x/y}R_{reference}}}-1} The δ values and absolute isotope ratios of common reference materials are summarized in Table 1 and described in more detail below. (wikipedia.org)
  • The reported isotopic ratios reflect the results from individual analyses of absolute mass fraction, aggregated in Meija et al. (wikipedia.org)
  • The Biogeochemical Analytical Service Laboratory provides analysis on 18 O/ 16 O and D/H ratios in water samples using Los Gatos Liquid Water Isotope Analyzer (Los Gatos Research). (ualberta.ca)
  • The Biogeochemical Analytical Service Laboratory provides analysis of 18 O/ 16 O and D/H ratios in solid phase samples using Hekatech High Temperature Oxygen Analyzer coupled with. (ualberta.ca)
  • Analysis of stable isotope ratios from mineralised tissue has been widely used for dietary reconstruction. (springer.com)
  • Biogeochemical analysis of total mercury (tHg) and δ 13C/δ15N ratios in the bone collagen of archeologically recovered Pacific Cod ( Gadus macrocephalus ) bone shows high levels of tHg during early/mid-Holocene. (frontiersin.org)
  • Stable carbon and nitrogen isotope ratios (δ 13 C/δ 15 N) in the bone collagen and other hard tissues of marine species serve as proxies for primary productivity and food web interactions. (frontiersin.org)
  • A new method was developed to measure the stable isotope ratios of carbon and carbon -bound non-exchangeable (CBNE) hydrogen from specific molecular positions in fructose and glucose in honey . (bvsalud.org)
  • This methodology has advantages over alternative isotopic methods , for measuring CBNE hydrogen isotope ratios in sugars , in terms of time , sensitivity and operability and offers a complementary method to differentiate authentic honey from invert sugar syrups. (bvsalud.org)
  • Archaeologists at UC Santa Cruz used predictive modeling to map strontium isotope ratios across all of modern-day Angola, a region in Southwest Africa that was once a major hub for the transatlantic slave trade. (ucsc.edu)
  • Researchers compared the resulting map with existing data on strontium isotope ratios from human remains to predict likely regions of origin within Angola for four individuals who had been buried in cemeteries for enslaved people across the Americas. (ucsc.edu)
  • Plants at the base of the food chain take up strontium isotopes from the soil in ratios that can differ slightly from that of the bedrock or soil, and local animals then incorporate the strontium isotope ratios from plants into their developing bones and teeth via their diet. (ucsc.edu)
  • Archaeologists can perform a stable isotope analysis on human remains to determine strontium ratios. (ucsc.edu)
  • Xueye Wang, lead author of the new paper, explained that Angola has ancient bedrock exposed at the surface on high plateaus near the center of the country, which gives the area very unique strontium isotope ratios. (ucsc.edu)
  • However, lack of samples from the broader region for use in stable isotope analysis has previously prevented archaeologists from pinpointing origins of human remains within Western Africa through strontium isotope ratios. (ucsc.edu)
  • Analyses of stable oxygen and carbon isotope ratios were used to test the hypothesis that there was a severe drought and related change in human diet in ancient Peru ca. 1100 C.E. Previous studies of ice cores from the Andes and paleobotanical studies of food refuse suggest that the change in climate had a major impact on human food consumption patterns. (youngscientistjournal.org)
  • Changes in carbon isotope ratios reveal changes in plant foods consumed. (youngscientistjournal.org)
  • It is possible to distinguish precious vanillin from Vanilla species (planifolia or tahitensis) from much less expensive synthetic and nature-identical vanillin on the basis of the stable isotope ratios of H and C ( 2 H/ 1 H, 13 C/ 12 C). Analysis is usually performed using GC-IRMS (Gas Chromatography - Isotope Ratio Mass Spectrometry) after solvent extraction of vanillin from the sample. (unitn.it)
  • 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)
  • We examined the natural variability of carbon and nitrogen isotopes in the symbiotic sea anemone Anemonia viridis to investigate dietary shifts (autotrophy/heterotrophy) along a natural p CO 2 gradient at the island of Vulcano, Italy. (nature.com)
  • 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)
  • 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)
  • XAD-2 resin and polyurethane foam (PUF) matrices were extracted with acetonitrile containing stable-isotope labeled internal standards (ISTD). (cdc.gov)
  • Then, 100 µL of the diluted urine is combined with 120 µL of a 0.2 N NaOH solution containing stable isotope labeled internal standards. (cdc.gov)
  • 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 highlights the potential of isotopic analysis as a tool for policy makers and regulatory bodies to verify seafood provenance and enforce industry compliance for source labelling of seafood products. (edu.au)
  • The preparation was simplified, optimized, and validated by isotopic analysis of replicate syntheses of HMT from fructose , glucose , sugar syrup and a representative authentic honey sample. (bvsalud.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)
  • Samples analysed by continuous flow isotope ratio mass spectroscopy. (elementallab.co.uk)
  • Our laboratory is equipped with 6 modern continuous flow - isotope ratio mass spectrometers. (iso-analytical.co.uk)
  • The facility is equipped with one Finnigan Delta+XP and a 3 Delta V continuous flow inlet Stable Isotope Ratio Mass Spectrometers (IRMS). (uwyo.edu)
  • The facility also houses a GC-C isotope ratio mass spectrometer(Delta V) for exploring compound specific work. (uwyo.edu)
  • These samples were then analysed using isotope ratio mass spectrometry to determine their carbon and nitrogen isotopic values. (edu.au)
  • Gas-Isotope-ratio mass spectrometry (G-IRMS) allows the precise measurement of mixtures of naturally occurring light stables isotopes. (lu.se)
  • The Biogeochemical Analytical Service Laboratory provides analysis on 15 N/ 14 N, 13 C/ 12 C, nitrogen and carbon contents in solid samples using EuroEA Elemental Analyzer (EuroVector) coupled with Isoprime Mass Spectrometer (GV Instruments). (ualberta.ca)
  • The Biogeochemical Analytical Service Laboratory provides analysis total nitrogen, carbon and hydrogen contents in both solid and particulate in water samples using CE-440 Elemental Analyzer (Exeter Analytical Inc). (ualberta.ca)
  • The Stable Isotope Facility is located in the Berry Biodiversity Conservation Center, in a laboratory designed specifically for an isotope facility. (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)
  • Associate Professor of Anthropology Vicky Oelze sorts ashed plant samples in preparation for strontium separation in the clean labs at UCSC's W. M. Keck Isotope Laboratory. (ucsc.edu)
  • 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 samples were processed, stored, and shipped to the Division of Laboratory Sciences, National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA for analysis. (cdc.gov)
  • 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)
  • The terminology of isotopic reference materials is not applied consistently across subfields of isotope geochemistry or even between individual laboratories. (wikipedia.org)
  • 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)
  • Analytical facilities in isotope geochemistry at the University of Texas at Austin are available for use by faculty and students of the University as well by scientists outside the University involved in collaborative research. (utexas.edu)
  • Principles of stable isotope geochemistry. (lu.se)
  • abstract = "Aim: To determine if stable isotope analysis is a viable tool for authenticating the geographical origin of seafood purchased from the market. (edu.au)
  • Title : Quantitative Analysis of Menthol in Human Urine Using Solid Phase Microextraction and Stable Isotope Dilution Gas Chromatography/Mass Spectrometry Personal Author(s) : Huang, Wenlin;Blount, Benjamin C.;Watson, Clifford H.;Watson, Christina;Chambers, David M. (cdc.gov)
  • This can mean a material that historically defined an isotopic scale, such as Vienna Standard Mean Ocean Water (VSMOW) for hydrogen isotopes, even if that material is not currently in use. (wikipedia.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)
  • The SPME method developed for 2 H/ 1 H analysis guarantees the absence of isotopic fractionation, repeatability and reproducibility standard deviation of below 7‰ and savings in terms of time (from 30 to 5 min) and solvent. (unitn.it)
  • 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)
  • It is known that stable carbon isotope fractionation is associated with the fixation of CO in autotrophic organisms [2]. (lu.se)
  • The research team used a similar process to get strontium isotope ratio data for Angola from herbarium specimens. (ucsc.edu)
  • Strontium is an element present in soil that comes in several different chemical forms, called isotopes. (ucsc.edu)
  • The team then used machine learning to combine the strontium isotope data from those samples with information about elevation, soil characteristics, climate, and geological variables across Angola. (ucsc.edu)
  • As a demonstration of the potential applications for their new map, researchers reviewed prior strontium isotope analysis of human remains in the Americas. (ucsc.edu)
  • Each of the major stable isotope systems (hydrogen, carbon, oxygen, nitrogen, and sulfur) has a wide variety of references encompassing distinct molecular structures. (wikipedia.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)
  • Supplement Table 2) Stable oxygen isotope analysis on benthic foraminifera Cibicidoides kullenbergi of sediment core GeoB13731-1. (pangaea.de)
  • The ratio of stable oxygen isotopes ( 18 O/ 16 O) and carbon isotopes ( 13 C/ 12 C) were obtained from the hydroxyapatite in dental enamel from human re-mains excavated from archaeology sites in the Peruvian Andes. (youngscientistjournal.org)
  • If there are significant changes in the oxygen isotope ratio ( 18 O/ 16 O) and carbon isotope ratio ( 13 C/ 12 C), reported as 18 O and 13 C values, from one period to the next, then this would suggest changes in precipitation levels and changes in food production and consumption. (youngscientistjournal.org)
  • Previous stable isotope studies have shown that changes in stable oxygen ra-tios indicate ancient climate changes, specifically as it relates to rainfall: a less negative 18 O value indicates less rainfall and a more negative value indicates more rainfall, with some exceptions that relate to distance from equator, alti-tude, and contributions from glacial melt water [1]. (youngscientistjournal.org)
  • Differences in carbon isotope values stem from the complexity of pathways adapted by plants to obtain oxygen and nutrients from the environment. (youngscientistjournal.org)
  • On Earth, water (H 2 O) containing a lighter isotope of oxygen, for instance, evaporates better, while H 2 O with the heavier oxygen isotope tends to precipitate faster. (cosmosmagazine.com)
  • This means that, depending on evaporation and rain levels around the globe, the concentration of oxygen isotopes in the rain is slightly different. (cosmosmagazine.com)
  • We can use this information to draw conclusions about the climate, and climate history, in an area - all by looking at oxygen isotopes. (cosmosmagazine.com)
  • Lighter oxygen isotope" and "heavier oxygen isotope" aren't really precise enough terms - especially if you're working with an element that has more than two naturally occurring isotopes. (cosmosmagazine.com)
  • The on the quantitative level of NP biodistribution, an analysis aerosol was diluted with nitrogen and--for rat exposures-- is required taking into account NP retention in the entire with oxygen adjusted to obtain 20% oxygen and the synthetic organism as well as the excretion. (cdc.gov)
  • 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)
  • Stable isotope tracing of temporal and spatial variability in organic matter sources to freshwater ecosystems. (limnology-journal.org)
  • Evaporation is the most serious problem for 18 O/ 16 O and DH analysis in liquid water samples. (ualberta.ca)
  • 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)
  • Water Isotope Analyzer is capable of analyzing all of th e samples that are generated by vacuum distillatio n. (scirp.org)
  • N analysis revealed that a few AgNO3 samples were of low purity (compared with expected % N of 8.2), highlighting the necessity to introduce quality control / quality assurance procedures for silver nitrate prepared from field water samples. (tcd.ie)
  • Use our quote form to obtain a price for isotope analysis of your samples. (iso-analytical.co.uk)
  • The sample turnaround times given are typical for analysis of 40 samples. (iso-analytical.co.uk)
  • The carbon and nitrogen isotope values of samples were analysed to determine if they differ according to their source. (edu.au)
  • The carbon and nitrogen isotope values of samples were analysed to determine if they differ according to their source.Methodology: One set of barramundi samples were purchased from three different markets and another set was obtained directly from a farm. (edu.au)
  • 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)
  • 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)
  • The botanists gave researchers permission to perform stable isotope analysis on 101 herbarium plant samples. (ucsc.edu)
  • This study inves-tigates the effectiveness of using stable isotope analysis, a method for testing the anatomical make-up of ancient samples, to address questions arising from the analysis of ancient artifacts and skeletons, and test the idea that climate change (i.e., a severe drought) contributed to significant changes in agricultural pro-duction and thus, food consumption and nutritional status among prehispanic peoples in the Andes. (youngscientistjournal.org)
  • All the samples were subjected to HS-SPME-GC-IRMS analysis and most of them to GC-IRMS analysis after solvent extraction of vanillin. (unitn.it)
  • In this work we demonstrate the potential of glycan reductive isotope labeling (GRIL) using [12C]- and [13C]-coded aniline and zwitterionic hydrophilic interaction capillary liquid chromatography electrospray mass spectrometry (μZIC-HILIC-ESI-MS) for relative quantitation of glycosylation variants in selected glycoproteins present in samples from cancer patients. (udg.edu)
  • Then, the proposed method was applied to the analysis of the clinical samples (control vs. pathological). (udg.edu)
  • 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)
  • Stable Isotope Lab analysis of fish samples collected at various locations throughout Washington state between 2007 and 2009. (noaa.gov)
  • In vitro measurements provide an indirect estimate of internally deposited cesium (both the stable and radioactive isotopes), by techniques that measure cesium in body fluids, feces, or other human samples (Gautier 1983). (cdc.gov)
  • Urine samples from NHANES 2001-2002 were stored frozen (-70°C) for up to 4 years before analysis. (cdc.gov)
  • Analysis was accomplished in Multiple Reaction Monitoring (MRM) mode, and analytes in unknown samples were identified by retention time (+/-0.1 min) and qualifier ratio (+/-30% absolute) as compared to the mean of calibrants. (cdc.gov)
  • Samples are then acidified with 30 µL of 2.0 N HCl and 250 µL of a 1:9 methanol/water solution containing 0.1% formic acid such that the matrix of the sample is similar to the starting mobile phase composition of the analysis step. (cdc.gov)
  • FT4 in serum samples remains stable after exposure to four freeze-thaw cycles, 5C for 18-20h, or -70C for a minimum of three years. (cdc.gov)
  • The method is applicable to the determination of perchlorate in 0.05 μg/L of urine over the range 0.005 to 1000 μg/L. The limit of detection for thiocynate was 20 μg/L and for nitrate 700 μg/L . Stable isotope labeled internal standards were employed in the analysis of perchlorate, thiocyanate and nitrate. (cdc.gov)
  • I also tested whether the use of hydroponically grown plants to reduce isotope variability in animal diets - and thereby in the tissues of the captive animals fed them - can increase the sensitivity of stable isotope analysis as a forensic tool. (ucf.edu)
  • Caffeine and 14 of its metabolites are quantified in urine by use of high-performance liquid chromatography-electrospray ionization-tandem quadrupole mass spectrometry (HPLC-ESI-MS/MS) with stable isotope labeled internal standards. (cdc.gov)
  • Fazili Zand Pfeiffer CM. Accounting for an isobaric interference allows correct determination of folate vitamers in serum by isotope dilution-liquid chromatography-tandem mass spectrometry external icon . (cdc.gov)
  • McCoy LF, Scholl PF, Schleicher RL, Groopman JD, Powers CD, Pfeiffer CM. Analysis of aflatoxin B1-lysine adduct in serum using isotope-dilution liquid chromatography/tandem mass spectrometry external icon . (cdc.gov)
  • Mineva EM, Schleicher RL, Chaudhary-Webb, M, May KL, Botelho JC, Vesper HW, Pfeiffer CM. A candidate reference measurement procedure for quantifying serum concentrations of 25-hydroxyvitamin D3 and 25-hydroxyvitamin D2 using isotope-dilution liquid chromatography-tandem mass spectrometry external icon . (cdc.gov)
  • Pawlosky RJ, Flanagan VP, Pfeiffer CM. Determination of 5-methyltetrahydrofolic acid in human serum by stable-isotope dilution high-performance liquid chromatography-mass spectrometry external icon . (cdc.gov)
  • This combination of DNA stable-isotope probing, MDA and metagenomics provided access to genomic information of a relatively large DNA fragment of these thus far uncultivated, predominant and active methanotrophs in peatland soil. (lancs.ac.uk)
  • Second, the annual inundation of the Nile River transports fresh layers of silt-rich fertile soil, which provides stable agriculture and supports cultivating various food crops and raising livestock. (researchgate.net)
  • By applying this model to phylogenetic marker sequencing data collected from stable-isotope probing studies, we estimate rates of growth, mortality, and turnover for individual microbial populations within soil assemblages. (osti.gov)
  • 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 ratio of these isotopes to one another indicates the age and chemical composition of the bedrock in a given region of the planet. (ucsc.edu)
  • 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)
  • Project SSM2019-5225: "Marine 14C levels around the Swedish coast" - Additional gamma spectrometric measurements and ICP-MS analysis of brown algae (Fucus spp. (lu.se)
  • 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)
  • Examples of these analytical techniques are given in NCRP Report No. 87 (1987) and are also listed in Table 7-1 for stable cesium and Table 7-2 for radioactive cesium. (cdc.gov)
  • Within the present study, DNA barcoding and stable isotope analysis improve prey identification and provide a more quantitative dietary analysis of adult black bass in Lake Ontario, comparing the importance of Round Goby as prey between these two species. (datadryad.org)
  • Chemical isotope labelling LC-MS analysis methods have been developed for most other phytohormones, enhancing their LC separations and quantitative sensitivity. (unboundmedicine.com)
  • Stable isotope analysis on planktic foraminifera in sediment core SU90-I03. (pangaea.de)
  • Impact assessments of invasive piscivorous fishes usually rely on dietary analyses to quantify their predation pressure on prey communities. (kmae-journal.org)
  • Previous dietary analyses have shown Round Goby to be important prey for bass, but have been limited by low visual identification rates of dissected stomach items. (datadryad.org)
  • These results suggest that when non-destructive sampling is required for dietary analyses of sport fishes, SIA can be applied using fin, scales and/ or mucus. (kmae-journal.org)
  • After de-N-glycosylation, relative quantitation of the hAGP glycans was carried out using stable isotope labeling and μZIC-HILIC-ESI-MS analysis. (udg.edu)
  • Importantly, the results demonstrate that the presented methodology combining an enrichment of a target protein by IAC with isotope coded relative quantitation of N-glycans can be successfully used for targeted glycomics studies. (udg.edu)
  • Stable isotopes of N ( 14 N, 15 N) are often used to trace the sources of N fueling aquatic primary production, but effective use of this approach requires obtaining a reliable isotopic ratio for phytoplankton. (usgs.gov)
  • Using a stable isotope mixing model approach, we estimated that in the presence of effluent between 40 and 90 % of phytoplankton N was derived from NH 4 + after 3 days of downstream transport. (usgs.gov)
  • Phytoplankton functional traits and seston stable isotopes ratio: a functional-based approach in a deep, subalpine lake, Lake Maggiore (N. Italy). (limnology-journal.org)
  • 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)
  • Richards and Hedges 1999 ), especially when combined with carbon isotope data. (springer.com)
  • In addition, we use the web analysis tool Matomo, which tracks data anonymously. (ufz.de)
  • The UW Stable Isotope Facility is a world class core research lab at the University of Wyoming. (uwyo.edu)
  • Without isotope references, measurements by mass spectrometry would be much less accurate and could not be used in comparisons across different analytical facilities. (wikipedia.org)
  • Isotope reference materials are generated, maintained, and sold by the International Atomic Energy Agency (IAEA), the National Institute of Standards and Technology (NIST), the United States Geologic Survey (USGS), the Institute for Reference Materials and Measurements (IRMM), and a variety of universities and scientific supply companies. (wikipedia.org)
  • A laser based Liquid Water Isotope Analyser from Picarro is used for isotopic measurements of H and O of waters. (uwyo.edu)
  • 2020) Lithium and Lithium Isotopes in Earth's surface cycles. (lu.se)
  • Elementar is the world leader in high performance analysis of organic and inorganic elements. (elementar.com)
  • 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)
  • The UW SIF provides quality isotopic analyses for the research community at UW and researchers world-wide. (uwyo.edu)
  • All instruments are configured for the analysis of H, C, N, S, and O. These mass spectrometers are connected to eight different peripheral devices, helping to meet the growing demands of researchers and students on campus. (uwyo.edu)
  • 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)
  • Stable isotope analysis has grown in importance as a forensic tool, but improvements are needed. (ucf.edu)
  • To address limitations of single-tissue stable isotope analysis as a forensic tool, I investigated between-tissue comparisons to differentiate between captive bred and wild sourced animals. (ucf.edu)
  • Combined, these experiments strengthen the viability of stable isotope analysis as a forensic tool capable of detecting signs of wildlife laundering. (ucf.edu)
  • These results demonstrate the potential of natural gas stable isotope signatures as a useful and reliable fluid quality prediction tool. (onepetro.org)
  • Fazili Z, Pfeiffer CM. Measurement of folates in serum and conventionally prepared whole blood lysates: application of an automated 96-well plate isotope-dilution tandem MS method external icon . (cdc.gov)
  • Supplement Table 1) Grain Size analysis on sediment core GeoB13731-1. (pangaea.de)
  • This article aggregates the δ and R values of common and non-traditional stable isotope reference materials. (wikipedia.org)
  • The result was a predictive model that filled the gaps in isotope ratio values between sample sites in order to map out an "isoscape" of the entire country. (ucsc.edu)
  • Thus, making it possible to retrieve a permanent isotope signature based on origin of drinking water of organisms. (youngscientistjournal.org)
  • Because there are so many atoms, even slight differences in the concentrations of various isotopes can be used to get new information. (cosmosmagazine.com)
  • Methods were developed for the on-line analysis of stable isotopes of nitrogen (at natural abundance levels) in NH 3 , NO and NO 2 in order to study the contribution of these trace gases to nitrogen cycling in ecosystems. (uni-bayreuth.de)
  • However, methods such as enrichment factors and principal component analysis can crudely discriminate between various sources of an element such as Pb. (bl.uk)
  • Rather, the intention is to identify well-established methods that are used as the standard methods of analysis. (cdc.gov)
  • NHANES uses several methods to monitor the quality of the analyses performed by the contract laboratories. (cdc.gov)
  • The mixture is incubated for at least 30 min at room temperature, facilitating the conversion of an unstable uracil metabolite into a more stable form. (cdc.gov)
  • 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)
  • Groundwater was oversaturated with GHGs with respect to its equilibrium concentrations with the atmosphere in all zones, except the northern one, undersaturated in N 2 O (0.07 ± 0.08 μgN/L vs. 0.3 μgN/L). Vertical dimension studies showed the decrease in CO 2 concentration and significant changes in both isotope signatures and concentration of N 2 O with depth. (ufz.de)