• Molybdenum and tungsten are redox-sensitive elements, and their stable isotope ratios have attracted attention as paleoceanographic proxies. (frontiersin.org)
  • In this study, we provided the concentrations and isotope ratios of dissolved Mo and W in the oceans (the North Pacific and Indian Oceans), marginal seas (the East China Sea and Sea of Japan), and a river-estuary system in Japan (from the Uji-Yodo rivers to Osaka Bay). (frontiersin.org)
  • Among Mo isotope ratios, the 98 Mo/ 95 Mo ratio is conventionally used as a tracer. (frontiersin.org)
  • The ratios of isotopes in a sample material are measured by isotope-ratio mass spectrometry against an isotopic reference material. (wikipedia.org)
  • To better understand short-term variation in diet, we examined inter-annual variation in body condition indices, fatty acid composition, and stable isotope ratios in EBS beluga whales in relation to environmental conditions. (int-res.com)
  • Researchers measuring the ratios of sulfur isotopes in a rock sample can learn whether the sulfur was magma from deep below the surface, atmospheric sulfur dioxide or a related compound, or a product of biological activity. (astronomy.com)
  • The ratios of heavy to light isotopes for these three elements, such as the ratio of sulphur 32 to its heavier counterpart, sulphur 34, provide an isotopic fingerprint for each alabaster deposit according to its geological age and the conditions of its formation. (brgm.fr)
  • The carbon and oxygen isotope ratios are sensitive recorders of local and regional rainfall dynamics. (pik-potsdam.de)
  • In the present study, 27 mandibular teeth (18 s molars, 6 first molars, and 3 premolars) collected from the Ajnala skeletal assemblage were processed for strontium isotope analysis, and the measured ratios were compared with published isotope baseline data to estimate the locality status of these remains. (bvsalud.org)
  • We used a multi-technique approach: optical microscopy, modal analysis, FE-SEM imaging and elemental mapping, stable isotope ratios and LA-ICP-MS. This approach could be applied also to recent case-studies, such as the on-going climate change due to anthropogenic activities. (lu.se)
  • 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)
  • Baleen grows continually and is biochemically inert once formed, so dietary changes over short time increments are recorded in its stable isotope composition (Lee et al 2005). (arcus.org)
  • Based on whole-rock major and trace element composition, three groups of rocks can be distinguished: i) Group 1 rocks, which are subalkaline basalts having backarc affinity, ii) Group 2a and iii) Group 2b rocks, which are calc-alkaline basalts having arc affinity, with and without adakitic signatures, respectively. (ofioliti.it)
  • The major ion hydrochemistry and environmental isotope composition ( δ 18 O, δ 2 H) were investigated to identify the recharge sources and processes that affect the groundwater salinization. (hindawi.com)
  • The course gives an introduction to fundamental geochemical tools and directions like aqueous geochemistry, trace element geochemistry and isotope geochemistry, and how these can be used to understand the formation of the elements and the solar system, the Earth´s geochemical composition and differentiation into different reservoirs, the age of rocks, global geochemical cycles, the surface environment, and chemical traces of early life. (uib.no)
  • The oxygen and hydrogen isotope composition of waters in a small valley at Signy Island, South Orkney Islands, were monitored over three summers (1999 to 2001). (nerc.ac.uk)
  • The strontium (Sr) isotope composition of human bones and teeth has been widely used to reconstruct an individual's geo-affiliation, residential mobility, and migration history. (bvsalud.org)
  • Internal water temperature, pH and H/D isotope composition. (lu.se)
  • Stable carbon and nitrogen isotope data from green turtles sampled at Dry Tortugas National Park, FL. (usgs.gov)
  • Stable carbon and nitrogen isotope analysis (SIA) was used to examine trophic interactions in a naturally acidified shallow coastal CO 2 area in the Mediterranean Sea. (infona.pl)
  • 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)
  • 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)
  • The temporal and spatial dynamics of sediment, carbon (C), and nitrogen (N) during the brown trout spawning season in a small river of the Swiss Plateau were assessed and C isotopes as well as the C/N atomic ratio were used to distinguish autochthonous and allochthonous sources of organic matter in SS loads. (egu.eu)
  • We focused on nitrogen (N) release from this degradation and associated cycling using N isotopes, an understudied area. (copernicus.org)
  • An isotopic signature (also isotopic fingerprint) is a ratio of non-radiogenic 'stable isotopes', stable radiogenic isotopes, or unstable radioactive isotopes of particular elements in an investigated material. (wikipedia.org)
  • 5) Frank, M. 2002 Radiogenic isotopes: tracers of past ocean circulation and erosional input, Review of Geophysics 40. (lu.se)
  • The magnitude and patterns of annual oscillations varied among individuals and could be due to seasonal fasting (e.g. enrichment in δ 15 N resulting from protein catabolism) or feeding in locations across their annual range with different isotopic signatures. (arcus.org)
  • C and S isotopic signatures of magmatic rocks could be used as proxies of the slab components involved in the petrogenesis of subduction-related ophiolites. (ofioliti.it)
  • However, we cannot exclude that such C-enriched signature is the result of isotopic fractionation during degassing process. (ofioliti.it)
  • In contrast, the enriched S isotopic signatures of the North Macedonia ophiolites suggest a major involvement of melts derived from the subducting sediments rich in sulphate phases. (ofioliti.it)
  • Stable isotope (SI) analysis studies rely on knowledge of isotopic turnover rates and trophic-step discrimination factors. (springer.com)
  • 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)
  • We discuss implications of source variation for designing sampling protocols, interpreting isotopic signatures, and establishing trophic links between plants and consumers. (scielo.br)
  • This isotopic evidence stems from the fact that the carbon atom has two stable isotopes, carbon-12 and carbon-13. (palaeos.com)
  • The key objectives of this project were as follows: (1) to validate the combined use of Cl and O stable isotope ratio analysis as a forensic tool to distinguish sources of perchlorate in groundwater, and (2) to demonstrate the isotopic techniques as a method to verify perchlorate biodegradation in the field. (serdp-estcp.org)
  • This technique was applied to a wide variety of solid perchlorate samples of differing origin to develop a broad database of isotopic signatures among natural and man-made materials. (serdp-estcp.org)
  • Isotopic signatures of perchlorate in these waters were then determined. (serdp-estcp.org)
  • Stable isotope and geochemical techniques have been used in groundwater studies of coastal aquifers worldwide [ 22 - 25 ] for determining the origins of groundwater salinization in aquifers and processes that affect water chemistry, such as rock weathering, evaporation, atmospheric precipitation, and cation exchange. (hindawi.com)
  • Consequently, studying stable isotope and geochemical techniques can significantly improve our understanding of groundwater hydrodynamical processes and chemical evolution [ 26 ]. (hindawi.com)
  • The occurrence of Boninitic geochemical signatures offers evidence that plate tectonic processes may be responsible for the creation of the belt. (palaeos.com)
  • Rare earth elements will be determined using electron microprobe (EMP) and laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS). Oxygen isotopes will be analyzed using isotope mass spectrometry (MS). It is anticipated, based on tectonic history, petrographic and geochemical analyses, that the characteristics of these vein-filling cements will indicate a meteoric origin for the parent fluid(s). (searchanddiscovery.com)
  • The goals of my PhD project are to describe the morphology of post-extinction ooids, interpret the geochemical signature that ooids incorporated while their carbonatic cortices were growing and to correlate it with changes in ocean chemistry in the early aftermath of mass extinctions. (lu.se)
  • Andrews, JE , Riding, R & Dennis, PF 1996, ' Regional environmental and climatic signatures from stable isotopes in modern terrestrial microbial carbonates from Europe ', Paper presented at International Symposium on the Geochemistry of the Earth's Surface, Ilkely, Yorkshire, 22/07/96 - 28/07/96 pp. 174-177. (uea.ac.uk)
  • Principles of stable isotope geochemistry. (lu.se)
  • Further interpretation of isotope ratio patterns in baleen will enable assessment of seasonal feeding patterns and habitat usage as it relates to seasonal sea ice conditions. (arcus.org)
  • For example, different sources and sinks of methane have different affinity for the 12C and 13C isotopes, which allows distinguishing between different sources by the 13C/12C ratio in methane in the air. (wikipedia.org)
  • The ratio of carbon-13 and carbon-12 isotopes in these types of plants is as follows: C4 plants: -16 to -10 ‰ CAM plants: -20 to -10 ‰ C3 plants: -33 to -24 ‰ Limestones formed by precipitation in seas from the atmospheric carbon dioxide contain normal proportion of 13C. (wikipedia.org)
  • Stable isotope ratio variation in natural systems reflects the dynamics of Earth systems processes and imparts isotope labels to Earth materials. (springer.com)
  • In biological syntheses, the processing of carbon [in] CO2 and carbonates gives a preference to the lighter carbon isotope and raises the ratio to about 92. (palaeos.com)
  • Stable isotope ratio analysis of chlorine and oxygen in the perchlorate molecule were employed as the primary forensic tool to identify perchlorate from different sources. (serdp-estcp.org)
  • Experiments to date indicate that post depositional modification by biodegradation causes a reproducible fractionation factor ratio between O and Cl isotopes in perchlorate ( ε 18 O/ ε 37 Cl = 2.5) that is roughly perpendicular to the area in which mixtures of synthetic and Chilean ClO 4 - plot in dual isotope plots. (serdp-estcp.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)
  • Rare earth element (REE) and oxygen isotope signatures in the Ordovician Vinini Formation type-section in central Nevada are being used to test the hypothesis that water-rock interaction in the typesection was limited to diagenetic fluids of meteoric origin. (searchanddiscovery.com)
  • Oxygen isotopes are used to determine the temperature of the parent fluid(s) that precipitated the vein-filling cements. (searchanddiscovery.com)
  • A new forensic approach for perchlorate has been developed, based on measurements of the stable isotopes of chlorine ( 37 Cl and 35 Cl) and oxygen ( 18 O, 17 O, and 16 O), and a radioactive chlorine isotope ( 36 Cl) in perchlorate. (serdp-estcp.org)
  • ABSTRACT: In the first published study of the wintering ranges and activity patterns of skuas from any colony, we combined tracking (geolocator) and stable isotope analysis in a comparison of migration behaviour of brown skuas Catharacta lonnbergi and Falkland skuas C. antarctica from South Georgia and the Falkland Islands, respectively. (int-res.com)
  • p. 55) claims to have identified biological carbon isotope signatures from >n;3,800 Ma aged, chemically precipitated sediments, including banded iron formations (BIFs) and chert, on Akilia Island, southwestern Greenland. (palaeos.com)
  • The occurrence of arsenosugars and arsenobetaine in these deep sea organisms, where primary production is chemolithoautotrophic and stable isotope analyses indicate food sources are of vent origin, suggests that organic arsenicals can occur in a foodweb without algae or other photosynthetic life. (usgs.gov)
  • We used two independent discovery-based approaches-microarray gene expression and stable isotope labeling by amino acids in cell culture (SILAC) quantitative proteomic mass spectrometry analyses-to identify cellular phenotypes in SZ hiPSC NPCs from four SZ patients. (ca.gov)
  • In addition to Cl and O isotopes of perchlorate, there are a large number of supporting methods/analyses available as forensic lines of evidence to help identify sources of perchlorate (or other contaminants) in a groundwater environment. (serdp-estcp.org)
  • The application of strontium isotope analyses for estimating geolocation of archeological remains is of great interest in bioarcheology and modern forensics. (bvsalud.org)
  • The shrimp species, Rimicaris exoculata, the vent chimney-dwelling mussel, Bathymodiolus azoricus, Branchipolynoe seepensis, a commensal worm of B. azoricus and the gastropod Peltospira smaragdina showed variations in As concentration and in stable isotope (δ 13 C and δ 15 N) signature between species, suggesting different sources of As uptake. (usgs.gov)
  • The research team studied variations in stable isotope signatures from a stalagmite that was collected in a cave near Uxbenka/Belize, an important archaeological site in the former heartland of the Maya. (pik-potsdam.de)
  • There is very little Indian data on the bioavailable strontium, so the inferences from the present study estimating Sr isotope abundances are expected to provide baseline data for future forensic provenance studies that will contribute to the global efforts of mapping Sr isotope variations by the isotope community. (bvsalud.org)
  • Isotope values also suggested a mixed diet for brown skuas of zooplankton, low trophic-level squid and fish, with little or no reliance on seabird predation or fisheries. (int-res.com)
  • Rare earth elements are used as the chemical indicator because they are non-reactive and their signature can help determine fluid provenance. (searchanddiscovery.com)
  • Stable isotope methods for provenance of unidentified human remains are relatively a newer field of enquiry in forensic archeology. (bvsalud.org)
  • Chemical signatures in baleen provide a means to study eastern Arctic bowhead whale ecology and habitat use. (arcus.org)
  • 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)
  • More certain is the report from Rosing (1999) of a biological carbon isotope signature from ~3,780 Ma (3,779 ± 81 Sm-Nd date) greywackes and slates with well-preserved sedimentary structures from the Garbenschiefer Formation in the Isua belt. (palaeos.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)
  • This process is called isotope analysis. (wikipedia.org)
  • Liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) with stable isotope labeled internal standards (SIL-IS) is the gold standard for quantitative analysis of drugs and metabolites in complex biological samples. (cdc.gov)
  • Researchers have compiled the most comprehensive record of the distribution of sulfur isotopes on Mars. (astronomy.com)
  • Sulfur has four naturally occurring stable isotopes, or different forms of the element, each with its own atomic signature. (astronomy.com)
  • Sulfur is also chemically versatile, interacting with many other elements, and each type of interaction distributes sulfur isotopes in a different way. (astronomy.com)
  • Using state-of-the-art techniques to track the sulfur isotopes in samples from the martian meteorites, the researchers were able to identify some sulfur as a product of photochemical processes in the martian atmosphere. (astronomy.com)
  • The atomic mass of different isotopes affect their chemical kinetic behavior, leading to natural isotope separation processes. (wikipedia.org)
  • Stable isotope signatures of brown skua feathers indicated that distributions of tracked birds were typical of most or all of the breeding population, and were consistent from year to year. (int-res.com)
  • These stable isotopes track water movement through the catchment, especially seasonal precipitation and snow melt. (nerc.ac.uk)
  • The microbial degradation of native lignin by basidiomyce- citrant and stable in the environment. (lu.se)
  • 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)
  • Mucus isotope data differed significantly and predictively from muscle data. (springer.com)
  • Organic matter (OM) turnover into dissolved inorganic carbon (DIC) was investigated by means of carbon isotope mass balances in Germany's largest water reservoir. (copernicus.org)
  • the C3 carbon fixation, where the isotope separation effect is more pronounced, C4 carbon fixation, where the heavier 13C is less depleted, and Crassulacean Acid Metabolism (CAM) plants, where the effect is similar but less pronounced than with C4 plants. (wikipedia.org)
  • Astronomy.com Geologists who analyzed 40 meteorites that fell to Earth from Mars unlocked secrets of the martian atmosphere hidden in the chemical signatures of these ancient rocks. (astronomy.com)
  • Each has several stable isotopes, which are variants of chemical elements that differ only in the number of their neutrons and therefore mass. (brgm.fr)
  • Phillips RA, Catry P, Silk JRD, Bearhop S, McGill R, Afanasyev V, Strange IJ (2007) Movements, winter distribution and activity patterns of Falkland and brown skuas: insights from loggers and isotopes. (int-res.com)
  • These results demonstrate the potential of natural gas stable isotope signatures as a useful and reliable fluid quality prediction tool. (onepetro.org)
  • Este estudio investiga la variación natural en isótopos estables de C y N entre especies de plantas en dos bosques inundables de la Amazonía noroccidental con biogeoquímica de cuenca contrastantes (várzea-bosques de aguas blanca e igapó-bosques de aguas negras). (scielo.br)
  • N inputs from permafrost degradation and seasonal river N trends were identified using isotopes, helping to predict climate change impacts. (copernicus.org)
  • To date, a limited number of stable isotope studies on fish mucus suggest it has a relatively fast turnover rate. (springer.com)
  • Electron microscopy, spatially resolved x-ray spectroscopy and diffraction, and stable isotope studies are being used to address this topic. (nasa.gov)
  • Here we established stable isotope (δ13C, δ15N) values for the endangered green sea turtle (Chelonia mydas) population found within the boundaries of Dry Tortugas National Park (DRTO), south Florida, USA. (usgs.gov)
  • Freezing of surface waters preserves the isotope signature of the underlying waters from the previous summer. (nerc.ac.uk)