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Artículos de revistas sobre el tema "Isotopes"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

Musich, О., A. Zubko, and О. Demyanуuk. "Isotopic effect of macro- and microelements in ecosystems." Balanced nature using, no. 4 (August 18, 2020): 132–38. http://dx.doi.org/10.33730/2310-4678.4.2020.226644.

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Isotopic effects occurring in living organisms due to metabolism are analyzed. The phenomenon of metabolism is considered in the classical sense as a combination of biochemical reactions (mainly enzymatic) that take place in the cells of living beings and provide the cleavage, synthesis and interconversion of complex compounds. The scope of use of natural isotopes is wide and diverse. Isotopes are carriers of information about the birth and transformation of molecules, and isotope fractionation is a chemical characteristic of a substance. Isotope metabolism consists in the intermolecular frac

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2

Li, Xiangnan, Baisha Weng, Denghua Yan, et al. "Anthropogenic Effects on Hydrogen and Oxygen Isotopes of River Water in Cities." International Journal of Environmental Research and Public Health 16, no. 22 (2019): 4429. http://dx.doi.org/10.3390/ijerph16224429.

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Stable hydrogen and oxygen isotopes are important indicators for studying water cycles. The isotopes are not only affected by climate, but are also disturbed by human activities. Urban construction has changed the natural attributes and underlying surface characteristics of river basins, thus affecting the isotopic composition of river water. We collected urban river water isotope data from the Global Network for Isotopes in Rivers (GNIR) database and the literature, and collected river water samples from the Naqu basin and Huangshui River basin on the Tibetan Plateau to measure hydrogen and o

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3

Miljević, Nada, and Dušan Golobočanin. "Potential Use of Environmental Isotopes in Pollutant Migration Studies." Archives of Industrial Hygiene and Toxicology 58, no. 2 (2007): 251–62. http://dx.doi.org/10.2478/v10004-007-0015-5.

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Potential Use of Environmental Isotopes in Pollutant Migration StudiesThis article presents the use of natural abundance stable isotope (hydrogen, carbon, nitrogen, oxygen, chlorine) analysis data as a tool for providing important information about the origin of contaminants, the contribution of different sources to a multi-source plume, characterisation of their complex transport (rate and mechanisms) and for evaluating the success of contaminated site remediation. Isotopic signatures of contaminants are useful tracers of their sources, while isotopic fractionation can be used to quantitative

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4

Pollard, A. M. "Isotopes and impact: a cautionary tale." Antiquity 85, no. 328 (2011): 631–38. http://dx.doi.org/10.1017/s0003598x00068034.

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There can be no doubt that isotopic studies have made a huge contribution to archaeology in recent years, so much so that isotope archaeology is now seen as an essential subdiscipline of archaeology in much the same way as isotope geochemistry is a key subdiscipline of geochemistry. Ignoring for current purposes the contribution made by the measurement of a particular radioactive isotope of carbon (14C) since 1950, we can date the beginnings of isotope archaeology to the mid 1960s with the first measurements of lead isotopes in archaeological metals and slags by Brill and Wampler (1965, 1967).

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5

Emmanuel, S., J. A. Schuessler, J. Vinther, A. Matthews, and F. von Blanckenburg. "A preliminary study of iron isotope fractionation in marine invertebrates (chitons, Mollusca) in near-shore environments." Biogeosciences 11, no. 19 (2014): 5493–502. http://dx.doi.org/10.5194/bg-11-5493-2014.

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Abstract. Chitons (Mollusca) are marine invertebrates that produce radulae (teeth or rasping tongues) containing high concentrations of biomineralized magnetite and other iron-bearing minerals. As Fe isotope signatures are influenced by redox processes and biological fractionation, Fe isotopes in chiton radulae might be expected to provide an effective tracer of ambient oceanic conditions and biogeochemical cycling. Here, in a pilot study to measure Fe isotopes in marine invertebrates, we examine Fe isotopes in modern marine chiton radulae collected from different locations in the Atlantic and

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6

Jensen, Alexandria, William Ford, James Fox, and Admin Husic. "Improving In-Stream Nutrient Routines in Water Quality Models Using Stable Isotope Tracers: A Review and Synthesis." Transactions of the ASABE 61, no. 1 (2018): 139–57. http://dx.doi.org/10.13031/trans.12545.

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Abstract. Water quality models serve as an economically feasible alternative to quantify fluxes of nutrient pollution and to simulate effective mitigation strategies; however, their applicability is often questioned due to broad uncertainties in model structure and parameterization, leading to uncertain outputs. We argue that reduction of uncertainty is partially achieved by integrating stable isotope data streams within the water quality model architecture. This article outlines the use of stable isotopes as a response variable within water quality models to improve the model boundary conditi

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7

Orlowski, N., P. Kraft, and L. Breuer. "Exploring water cycle dynamics through sampling multitude stable water isotope pools in a small developed landscape of Germany." Hydrology and Earth System Sciences Discussions 12, no. 2 (2015): 1809–53. http://dx.doi.org/10.5194/hessd-12-1809-2015.

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Abstract. Conducting a dual stable water isotope (δ2H and δ18O) study in the developed landscape of the Schwingbach catchment (Germany) helped to unravel connectivity and disconnectivity between the different water cycle components. The two-year weekly to biweekly measurements of precipitation, stream, and groundwater isotopes revealed that surface and groundwater are decoupled from the annual precipitation cycle but showed bidirectional interactions between each other. Seasonal variations based on temperature effects were observed in the precipitation signal but neither reflected in stream no

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8

Emmanuel, S., J. A. Schuessler, J. Vinther, A. Matthews, and F. von Blanckenburg. "Iron isotope fractionation in marine invertebrates in near shore environments." Biogeosciences Discussions 11, no. 4 (2014): 5533–55. http://dx.doi.org/10.5194/bgd-11-5533-2014.

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Abstract. Chitons (Mollusca) are marine invertebrates that produce radula (teeth or rasping tongue) containing high concentrations of biomineralized magnetite and other iron bearing minerals. As Fe isotope signatures are influenced by redox processes and biological fractionation, Fe isotopes in chiton radula might be expected to provide an effective tracer of ambient oceanic conditions and biogeochemical cycling. Here, in a pilot study to measure Fe isotopes in marine invertebrates, we examine Fe isotopes in modern marine chiton radula collected from different locations in the Atlantic and Pac

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9

Fujii, T., F. Moynier, A. Agranier, E. Ponzevera, and M. Abe. "Isotope fractionation of palladium in chemical exchange reaction." Proceedings in Radiochemistry 1, no. 1 (2011): 339–44. http://dx.doi.org/10.1524/rcpr.2011.0060.

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Abstract Palladium isotopes were fractionated by the solvent extraction technique with a crown ether. After purification by ion-exchange chemistry, the isotopic ratios of 105Pd/106Pd, 108Pd/106Pd, and 110Pd/106Pd were determined by multiple-collector inductively coupled plasma mass spectrometry. Isotope fractionations between the two phases were found to be larger than 0.1‰. The isotope fractionation of the odd atomic mass isotope (105Pd) showed a deviation from that estimated from the even atomic mass isotopes (106Pd, 108Pd, and 110Pd). The mass-independent isotope fractionation found was att

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10

Passey, Benjamin H. "Reconstructing Terrestrial Environments Using Stable Isotopes in Fossil Teeth and Paleosol Carbonates." Paleontological Society Papers 18 (November 2012): 167–94. http://dx.doi.org/10.1017/s1089332600002606.

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Carbon isotopes in Neogene-age fossil teeth and paleosol carbonates are commonly interpreted in the context of past distributions of C3 and C4 vegetation. These two plant types have very different distributions in relation to climate and ecology, and provide a robust basis for reconstructing terrestrial paleoclimates and paleoenvironments during the Neogene. Carbon isotopes in pre-Neogene fossil teeth are usually interpreted in the context of changes in the δ13C value of atmospheric CO2, and variable climate-dependent carbon-isotope discrimination in C3 plants. Carbon isotopes in pre-Neogene s

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11

Jackisch, Dominik, Bi Xuan Yeo, Adam D. Switzer, et al. "Precipitation stable isotopic signatures of tropical cyclones in Metropolitan Manila, Philippines, show significant negative isotopic excursions." Natural Hazards and Earth System Sciences 22, no. 1 (2022): 213–26. http://dx.doi.org/10.5194/nhess-22-213-2022.

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Abstract. Tropical cyclones have devastating impacts on the environment, economies, and societies and may intensify in the coming decades due to climate change. Stable water isotopes serve as tracers of the hydrological cycle, as isotope fractionation processes leave distinct precipitation isotopic signatures. Here we present a record of daily precipitation isotope measurements from March 2014 to October 2015 for Metropolitan Manila, a first-of-a-kind dataset for the Philippines and Southeast Asia. We show that precipitation isotopic variation at our study site is closely related to tropical c

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12

Sare, David T. J., John S. Millar, and Frederick J. Longstaffe. "Tracing dietary protein in red-backed voles (Clethrionomys gapperi) using stable isotopes of nitrogen and carbon." Canadian Journal of Zoology 83, no. 5 (2005): 717–25. http://dx.doi.org/10.1139/z05-064.

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We examined the stable isotopes of nitrogen and carbon in a small mammal, the red-backed vole (Clethroinomys gapperi (Vigors, 1830)), to determine if isotope signatures reflect diet composition. Nitrogen- and carbon-isotope ratios in tissues from voles maintained on different protein levels in the laboratory were compared with wild-trapped voles. The isotopic fractionation of dietary nitrogen and carbon was also examined as food was digested in the stomach, incorporated into bone collagen, bioapatite, and hair, and excreted as feces. Nitrogen and carbon isotopes were fractionated differently d

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13

Bonev, Nikolay. "Nd-Sr-Pb isotopes geochemistry of the Circum-Rhodope belt ophiolitic suites, Greece-Bulgaria: a synthesis." Review of the Bulgarian Geological Society 85, no. 2 (2024): 136–39. https://doi.org/10.52215/rev.bgs.2024.85.2.136.

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This study documents Nd-Sr-Pb isotopic compositions of the Jurassic Kassandra-Sithonia ophiolites and associated Jurassic Chortiatis arc suite of the western Circum-Rhodope Belt (CRB), which are compared with the same isotopes of the Jurassic arc-related Evros ophiolite of the eastern CRB in the northern Greece and southern Bulgaria. Nd-Sr-Pb isotopes are compatible with dominant mantle-derived Mid-Ocean Ridge Basalt (MORB) component mixed with a detectable amount of crustal material and/or sediment involved in their melt source in the subduction zone. These isotopic features are consistent wi

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14

Hughes, Abigail G., Sonja Wahl, Tyler R. Jones, et al. "The role of sublimation as a driver of climate signals in the water isotope content of surface snow: laboratory and field experimental results." Cryosphere 15, no. 10 (2021): 4949–74. http://dx.doi.org/10.5194/tc-15-4949-2021.

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Abstract. Ice core water isotope records from Greenland and Antarctica are a valuable proxy for paleoclimate reconstruction, yet the processes influencing the climate signal stored in the isotopic composition of the snow are being challenged and revisited. Apart from precipitation input, post-depositional processes such as wind-driven redistribution and vapor–snow exchange processes at and below the surface are hypothesized to contribute to the isotope climate signal subsequently stored in the ice. Recent field studies have shown that surface snow isotopes vary between precipitation events and

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15

Ibañez-Mejia, Mauricio, and François L. H. Tissot. "Reading the Isotopic Code of Heavy Elements." Elements 17, no. 6 (2021): 379–82. http://dx.doi.org/10.2138/gselements.17.6.379.

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The isotopic variability of the elements in our planet and Solar System is the end result of a complex mixture of processes, including variable production of isotopes in stars, ingrowth of daughter nuclides due to decay of radioactive parents, and selective incorporation of isotopes into solids, liquids, or gases as a function of their mass and/or nuclear volume. Interpreting the isotopic imprints that planetary formation and evolution have left in the rock and mineral record requires not only precise and accurate measurements but also an understanding of the drivers behind isotopic variabilit

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16

Datye, Amey, Supriyo Chakraborty, Rajib Chattopadhyay, MohammadArzoo Ansari, Archana Deodhar, and PM Mohan. "Precipitation isotopes’ response to the atmospheric processes over the mainland and the island region in the northern Indian Ocean: Implications to the paleo-monsoon study." MAUSAM 74, no. 2 (2023): 503–12. http://dx.doi.org/10.54302/mausam.v74i2.5998.

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The isotopic composition of precipitation was studied over a terrestrial environment in western India and an island region in the Bay of Bengal. We have examined the precipitation isotopes’ response to the surface temperature and the tropospheric warming during the monsoon season. We observed that tropospheric temperature and surface temperature are positively correlated over the ocean while they are negatively correlated over the land. As a result, the precipitation isotopes in these environments show the opposite behavior to surface temperature variability. Despite this difference, precipita

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17

Bühler, Janica C., Josefine Axelsson, Franziska A. Lechleitner, et al. "Investigating stable oxygen and carbon isotopic variability in speleothem records over the last millennium using multiple isotope-enabled climate models." Climate of the Past 18, no. 7 (2022): 1625–54. http://dx.doi.org/10.5194/cp-18-1625-2022.

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Abstract. The incorporation of water isotopologues into the hydrology of general circulation models (GCMs) facilitates the comparison between modeled and measured proxy data in paleoclimate archives. However, the variability and drivers of measured and modeled water isotopologues, as well as the diversity of their representation in different models, are not well constrained. Improving our understanding of this variability in past and present climates will help to better constrain future climate change projections and decrease their range of uncertainty. Speleothems are a precisely datable terr

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18

Tea, Illa, Arnaud De Luca, Anne-Marie Schiphorst, et al. "Stable Isotope Abundance and Fractionation in Human Diseases." Metabolites 11, no. 6 (2021): 370. http://dx.doi.org/10.3390/metabo11060370.

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The natural abundance of heavy stable isotopes (13C, 15N, 18O, etc.) is now of considerable importance in many research fields, including human physiology. In fact, it varies between tissues and metabolites due to isotope effects in biological processes, that is, isotope discriminations between heavy and light isotopic forms during enzyme or transporter activity. The metabolic deregulation associated with many diseases leads to alterations in metabolic fluxes, resulting in changes in isotope abundance that can be identified easily with current isotope ratio technologies. In this review, we sum

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19

Hu, Yue, Guo-dong Liu, and Cheng-cheng Xia. "Multi-time scale analysis of hydrogen and oxygen isotope characteristics and influence factors in precipitation in Vienna." MATEC Web of Conferences 246 (2018): 02011. http://dx.doi.org/10.1051/matecconf/201824602011.

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Based on isotope and meteorology data at Vienna station from 1972 to 2014 provided by GNIP, the average monthly and annual hydrogen and oxygen stable isotopic compositions and main factors were analyzed by using various trend analysis, periodic analysis and correlation analysis methods. The monthly mean isotopic compositions change slightly, reflecting the fact that although Vienna is affected by the maritime climate and the continental climate, the former impact is more significant. The slope and intercept of the LMWL in Vienna changed significantly from October to March, indicating that it w

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20

Kurita, N., Y. Fujiyoshi, T. Nakayama, Y. Matsumi, and H. Kitagawa. "Atmospheric circulation controls on the inter-annual variability in precipitation isotope ratio in Japan." Climate of the Past Discussions 10, no. 5 (2014): 3989–4032. http://dx.doi.org/10.5194/cpd-10-3989-2014.

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Abstract. This study explored the primary driver of variations of precipitation isotopes at multiple temporal scales (event, seasonal and inter-annual scales) to provide a greater depth of interpretation for isotope proxy records in Japan. A one-year record of the isotopic composition of event-based precipitation at Nagoya in central Japan showed less seasonal variation, but there is large isotopic variability on a storm-to-storm basis. In the summer, southerly flows transport isotopically enriched moisture from subtropical marine regions with the result that the rainfall produced by the subtr

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21

Meister, Patrick, and Carolina Reyes. "The Carbon-Isotope Record of the Sub-Seafloor Biosphere." Geosciences 9, no. 12 (2019): 507. http://dx.doi.org/10.3390/geosciences9120507.

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Sub-seafloor microbial environments exhibit large carbon-isotope fractionation effects as a result of microbial enzymatic reactions. Isotopically light, dissolved inorganic carbon (DIC) derived from organic carbon is commonly released into the interstitial water due to microbial dissimilatory processes prevailing in the sub-surface biosphere. Much stronger carbon-isotope fractionation occurs, however, during methanogenesis, whereby methane is depleted in 13C and, by mass balance, DIC is enriched in 13C, such that isotopic distributions are predominantly influenced by microbial metabolisms invo

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Doucet, Luc S., Oscar Laurent, Dmitri A. Ionov, Nadine Mattielli, Vinciane Debaille, and Wendy Debouge. "Archean lithospheric differentiation: Insights from Fe and Zn isotopes." Geology 48, no. 10 (2020): 1028–32. http://dx.doi.org/10.1130/g47647.1.

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Abstract The Archean continental lithosphere consists of a dominantly felsic continental crust, made of tonalite-trondhjemite-granodiorite (TTG) and subordinate granitoids, and a cratonic lithospheric mantle, made of highly refractory peridotites. Whether they stemmed from the same process of differentiation from the primitive mantle, or were two distinct components that were physically juxtaposed, remains debated. Metal stable isotope ratios are sensitive to magmatic and metamorphic processes and do not evolve with time. Therefore, stable isotope ratios are complementary to radiogenic isotope

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23

Carter, Wales A., Ulf Bauchinger, and Scott R. McWilliams. "The Importance of Isotopic Turnover for Understanding Key Aspects of Animal Ecology and Nutrition." Diversity 11, no. 5 (2019): 84. http://dx.doi.org/10.3390/d11050084.

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Stable isotope-based methods have proved to be immensely valuable for ecological studies ranging in focus from animal movements to species interactions and community structure. Nevertheless, the use of these methods is dependent on assumptions about the incorporation and turnover of isotopes within animal tissues, which are oftentimes not explicitly acknowledged and vetted. Thus, the purpose of this review is to provide an overview of the estimation of stable isotope turnover rates in animals, and to highlight the importance of these estimates for ecological studies in terrestrial, freshwater,

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24

Sedaghatpour, Fatemeh, and Stein B. Jacobsen. "Magnesium stable isotopes support the lunar magma ocean cumulate remelting model for mare basalts." Proceedings of the National Academy of Sciences 116, no. 1 (2018): 73–78. http://dx.doi.org/10.1073/pnas.1811377115.

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We report high-precision Mg isotopic analyses of different types of lunar samples including two pristine Mg-suite rocks (72415 and 76535), basalts, anorthosites, breccias, mineral separates, and lunar meteorites. The Mg isotopic composition of the dunite 72415 (δ25Mg = −0.140 ± 0.010‰, δ26Mg = −0.291 ± 0.018‰), the most Mg-rich and possibly the oldest lunar sample, may provide the best estimate of the Mg isotopic composition of the bulk silicate Moon (BSM). This δ26Mg value of the Moon is similar to those of the Earth and chondrites and reflects both the relative homogeneity of Mg isotopes in

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25

Kim, Songyi, Yeongcheol Han, Soon Do Hur, Kei Yoshimura, and Jeonghoon Lee. "Relating Moisture Transport to Stable Water Vapor Isotopic Variations of Ambient Wintertime along the Western Coast of Korea." Atmosphere 10, no. 12 (2019): 806. http://dx.doi.org/10.3390/atmos10120806.

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Atmospheric water vapor transfers energy, causes meteorological phenomena and can be modified by climate change in the western coast region of Korea. In Korea, previous studies have utilized precipitation isotopic compositions in the water cycle for correlations with climate variables, but there are few studies using water vapor isotopes. In this study, water vapor was directly collected by a cryogenic method, analyzed for its isotopic compositions, and used to trace the origin and history of water vapor in the western coastal region of Korea during the winter of 2015/2016. Our analysis of pai

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26

Prichko, T. G., U. F. Yakuba, and M. V. Karpushina. "Study of the possibility of using data on the content of stable isotopes of magnesium to predict the region of apple production." Agrarian science, no. 2 (March 5, 2023): 95–99. http://dx.doi.org/10.32634/0869-8155-2023-367-2-95-99.

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Relevance. Reliable criteria for determining the region of origin of fruit products attract the constant attention of researchers in various countries. A number of approaches aimed at solving this problem are already known, and some progress has been made in interpreting experimental data for fruits on the content of stable isotopes of hydrogen, carbon, oxygen, nitrogen, and sulfur. It is possible that information about the fractionation of stable isotopes of magnesium will allow us to obtain equally important and reliable information to achieve the same goals.Methods. A mass spectrometer with

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27

Wang, Yan, Zhongwei Wu, Yi Huang, et al. "Fe-Cu-Zn Isotopic Compositions in Polymetallic Sulfides from Hydrothermal Fields in the Ultraslow-Spreading Southwest Indian Ridge and Geological Inferences." Minerals 13, no. 7 (2023): 843. http://dx.doi.org/10.3390/min13070843.

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Submarine hydrothermal sulfides from the ultraslow-spreading Southwest Indian Ridge (SWIR) were sampled from three hydrothermal fields, and the Fe-Cu-Zn isotopic compositions were analyzed in this study. The Fe isotopes ranged from −0.011‰ to −1.333‰. We believe the processes controlling the Fe isotope variability in the hydrothermal systems include the sulfide precipitation process, the initial isotopic composition of the hydrothermal fluid, and the temperature during precipitation. Among these factors, the sulfide precipitation process is the dominant one. The Cu isotope compositions of the

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28

Reyes-García, Casandra, and José Luis Andrade. "Los isótopos estables del hidrógeno y el oxígeno en los estudios ecofisiológicos de plantas." Botanical Sciences, no. 80 (June 3, 2017): 19. http://dx.doi.org/10.17129/botsci.1742.

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Stable isotope studies of elements in biological organisms have become a useful tool to assess the exchange of molecules in the biosphere. Since water is one of the most abundant molecules in such an exchange, studies on stable isotopes of hydrogen and oxygen have become a fundamental component of many plant ecophysiological studies, from the leaf level to the reconstruction of past climates. In this review, we mention the most common methodologies, general notation and the most relevant research on hydrogen and oxygen stable isotopes. Also, we discuss studies on plant water sources, leaf isot

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29

Sturm, C., Q. Zhang, and D. Noone. "An introduction to stable water isotopes in climate models: benefits of forward proxy modelling for paleoclimatology." Climate of the Past Discussions 5, no. 3 (2009): 1697–729. http://dx.doi.org/10.5194/cpd-5-1697-2009.

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Abstract. Stable water isotopes have been measured in a wide range of climate archives, with the purpose of reconstructing regional climate variations. Yet the common assumption that the isotopic signal is a direct indicator of temperature proves to be misleading under certain circumstances, since its relationship with temperature also depends on e.g. atmospheric circulation and precipitation seasonality. The present article introduces the principles, benefits and caveats of using climate models with embedded water isotopes as a support for the interpretation of isotopic climate archives. A sh

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Ivanova, Elena Sergeevna, Olga Yurievna Rumiantseva, Anastasia Sergeevna Zavertkina, Anastasia Evgenievna Bueva, and Anna Sergeevna Elizarova. "The isotopic composition of hair among the population in the Vologda Region depending on the conditions of living and nutrition." Samara Journal of Science 10, no. 4 (2021): 46–50. http://dx.doi.org/10.17816/snv2021104107.

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Isotope mass spectrometry methods are used to study changes in the isotopic composition of organisms in the food chain called trophic fractionation. In particular, with the help of isotope analysis of tissues, it is possible to determine the type of nutrition and possible place of residence of a person, which helps in solving the tasks of forensic examination. In this study, the isotopic composition C and ⁵N in the hair of residents of the industrial city of Cherepovets and the Kirillovsky District of the Vologda Region, remote from industrial sources of pollution, was determined. The determin

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31

Xu, Yingkui, Dan Zhu, Xiongyao Li, and Jianzhong Liu. "Why magnesium isotope fractionation is absent from basaltic melts under thermal gradients in natural settings." Geological Magazine 157, no. 7 (2019): 1144–48. http://dx.doi.org/10.1017/s0016756819001304.

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AbstractLaboratory experiments have shown that thermal gradients in silicate melts can lead to isotopic fractionation; this is known as the Richter effect. However, it is perplexing that the Richter effect has not been documented in natural samples as thermal gradients commonly exist within natural igneous systems. To resolve this discrepancy, theoretical analysis and calculations were undertaken. We found that the Richter effect, commonly seen in experiments with wholly molten silicates, cannot be applied to natural systems because natural igneous samples are more likely to be formed out of p

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32

Quirt, David, and Antonio Benedicto. "Lead Isotopes in Exploration for Basement-Hosted Structurally Controlled Unconformity-Related Uranium Deposits: Kiggavik Project (Nunavut, Canada)." Minerals 10, no. 6 (2020): 512. http://dx.doi.org/10.3390/min10060512.

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Pb-isotopes have been proposed as pathfinders for sandstone-hosted unconformity-related U deposits, with isotope ratios providing information on mineralization timing and element remobilization and migration. Pb-isotopes proximal to mineralization display radiogenic signatures, often with ‘excess Pb’ suggestive of derivation from greater U concentrations than are currently present. The U deposits in the Kiggavik project area (west of Baker Lake, NU, Canada) are basement-hosted, contain several generations of pitchblende mineralization, display a strong structural control, and are located in fa

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33

Orlowski, Natalie, Philipp Kraft, Jakob Pferdmenges, and Lutz Breuer. "Exploring water cycle dynamics by sampling multiple stable water isotope pools in a developed landscape in Germany." Hydrology and Earth System Sciences 20, no. 9 (2016): 3873–94. http://dx.doi.org/10.5194/hess-20-3873-2016.

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Abstract. A dual stable water isotope (δ2H and δ18O) study was conducted in the developed (managed) landscape of the Schwingbach catchment (Germany). The 2-year weekly to biweekly measurements of precipitation, stream, and groundwater isotopes revealed that surface and groundwater are isotopically disconnected from the annual precipitation cycle but showed bidirectional interactions between each other. Apparently, snowmelt played a fundamental role for groundwater recharge explaining the observed differences to precipitation δ values. A spatially distributed snapshot sampling of soil water iso

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34

Kakareka, S. V., T. I. Kukharchyk, A. A. Ekaykin, and Yu G. Giginyak. "Stable isotopes in the snow of the coastal areas of Antarctica." Doklady of the National Academy of Sciences of Belarus 65, no. 4 (2021): 495–502. http://dx.doi.org/10.29235/1561-8323-2021-65-4-495-502.

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The first results of study of stable isotopes of oxygen (δ18O) and hydrogen (δD) in the snow samples taken on the islands of Marguerite Bay (Antarctic Peninsula), in the Vecherny Oasis (Enderby Land), and Larsemann Hills (Princess Elizabeth Land) by the participants of the 12th Belarusian Antarctic Expedition (January–March 2020) are presented. The concentration of water isotopes: deuterium (D) and oxygen-18 (18O) in the samples was determined using a laser isotope composition analyzer Picarro L2130. A total of 32 snow samples were analyzed. The statistical parameters of the isotopic compositi

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35

Eltsova, Liubov Sergeevna, Olga Vasilyevna Duryagina, Liudmila Victorovna Kuznetsova та Elena Sergeevna Ivanova. "Isotopic composition of carbon (ẟ¹³C) and nitrogen (ẟ¹⁵N) in the hair of the order Rodentia of the Vologda Region". Samara Journal of Science 13, № 4 (2024): 20–25. https://doi.org/10.55355/snv2024134103.

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The study is devoted to the analysis of the ratio of stable carbon isotopes (ẟ¹³C) and stable nitrogen isotopes (ẟ¹⁵N) in the hair of mammals of the Rodentia order (Eurasian beaver –Castor fiberLinnaeus, 1758; Ural field mouse –Apodemus uralensisPallas, 1811; European water vole –Arvicola amphibius(Linnaeus, 1758); Muskrat –Ondatra zibethicusLinnaeus, 1766; Siberian chipmunk –Eutamias sibiricus(Laxmann, 1769); Siberian flying squirrel –Pteromys volansLinnaeus, 1758; Red squirrel –Sciurus vulgarisLinnaeus, 1758) in the Vologda Region.The isotopic composition of carbon in the hair of the studied

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36

Voigt, Christian C., Felix Matt, Robert Michener, and Thomas H. Kunz. "Low turnover rates of carbon isotopes in tissues of two nectar-feeding bat species." Journal of Experimental Biology 206, no. 8 (2003): 1419–27. https://doi.org/10.5281/zenodo.13474310.

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(Uploaded by Plazi for the Bat Literature Project) Stable isotopes of carbon are commonly used to characterize dietary preferences in animals. Because turnover rates of carbon isotopes are related to metabolic rate, we wanted to determine the rates at which carbon isotopes are exchanged in tissues of two species of nectarfeeding bats (Leptonycteris curasoae and Glossophaga soricina), both of which have relatively high mass-specific metabolic rates. To test the hypothesis that isotope turnover is higher in nectar-feeding bats, because of their high mass-specific metabolic rates, than in other e

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37

Voigt, Christian C., Felix Matt, Robert Michener, and Thomas H. Kunz. "Low turnover rates of carbon isotopes in tissues of two nectar-feeding bat species." Journal of Experimental Biology 206, no. 8 (2003): 1419–27. https://doi.org/10.5281/zenodo.13474310.

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(Uploaded by Plazi for the Bat Literature Project) Stable isotopes of carbon are commonly used to characterize dietary preferences in animals. Because turnover rates of carbon isotopes are related to metabolic rate, we wanted to determine the rates at which carbon isotopes are exchanged in tissues of two species of nectarfeeding bats (Leptonycteris curasoae and Glossophaga soricina), both of which have relatively high mass-specific metabolic rates. To test the hypothesis that isotope turnover is higher in nectar-feeding bats, because of their high mass-specific metabolic rates, than in other e

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38

Voigt, Christian C., Felix Matt, Robert Michener, and Thomas H. Kunz. "Low turnover rates of carbon isotopes in tissues of two nectar-feeding bat species." Journal of Experimental Biology 206, no. 8 (2003): 1419–27. https://doi.org/10.5281/zenodo.13474310.

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(Uploaded by Plazi for the Bat Literature Project) Stable isotopes of carbon are commonly used to characterize dietary preferences in animals. Because turnover rates of carbon isotopes are related to metabolic rate, we wanted to determine the rates at which carbon isotopes are exchanged in tissues of two species of nectarfeeding bats (Leptonycteris curasoae and Glossophaga soricina), both of which have relatively high mass-specific metabolic rates. To test the hypothesis that isotope turnover is higher in nectar-feeding bats, because of their high mass-specific metabolic rates, than in other e

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39

Voigt, Christian C., Felix Matt, Robert Michener, and Thomas H. Kunz. "Low turnover rates of carbon isotopes in tissues of two nectar-feeding bat species." Journal of Experimental Biology 206, no. 8 (2003): 1419–27. https://doi.org/10.5281/zenodo.13474310.

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(Uploaded by Plazi for the Bat Literature Project) Stable isotopes of carbon are commonly used to characterize dietary preferences in animals. Because turnover rates of carbon isotopes are related to metabolic rate, we wanted to determine the rates at which carbon isotopes are exchanged in tissues of two species of nectarfeeding bats (Leptonycteris curasoae and Glossophaga soricina), both of which have relatively high mass-specific metabolic rates. To test the hypothesis that isotope turnover is higher in nectar-feeding bats, because of their high mass-specific metabolic rates, than in other e

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40

Voigt, Christian C., Felix Matt, Robert Michener, and Thomas H. Kunz. "Low turnover rates of carbon isotopes in tissues of two nectar-feeding bat species." Journal of Experimental Biology 206, no. 8 (2003): 1419–27. https://doi.org/10.5281/zenodo.13474310.

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(Uploaded by Plazi for the Bat Literature Project) Stable isotopes of carbon are commonly used to characterize dietary preferences in animals. Because turnover rates of carbon isotopes are related to metabolic rate, we wanted to determine the rates at which carbon isotopes are exchanged in tissues of two species of nectarfeeding bats (Leptonycteris curasoae and Glossophaga soricina), both of which have relatively high mass-specific metabolic rates. To test the hypothesis that isotope turnover is higher in nectar-feeding bats, because of their high mass-specific metabolic rates, than in other e

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41

Larner, Fiona, Catriona A. McLean, Alex N. Halliday, and Blaine R. Roberts. "Copper Isotope Compositions of Superoxide Dismutase and Metallothionein from Post-Mortem Human Frontal Cortex." Inorganics 7, no. 7 (2019): 86. http://dx.doi.org/10.3390/inorganics7070086.

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The natural copper isotopic compositions of superoxide dismutase and metallothionein from six post-mortem human frontal cortices were determined using a combination of size exclusion protein liquid chromatography, followed by anion exchange chromatography and multiple collector inductively-coupled plasma mass spectrometry. Superoxide dismutase was enriched in the heavier 65Cu relative to the metallothionein fraction in all specimen pairs. The isotopic compositions were independent of copper content. This finding provides evidence that nitrogen ligands in protein copper binding sites will be en

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42

Chelnokov, G. A., V. Yu Lavrushin, Y. Ma, et al. "GENESIS OF MUD VOLCANIC AND MINERAL WATERS OF SOUTHERN SAKHALIN: BASED ON CHLORINE AND BORON ISOTOPE DATA." Tikhookeanskaya Geologiya 44, no. 4 (2025): 98–112. https://doi.org/10.30911/0207-4028-2025-44-4-98-112.

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The study provides the first data on the quantity and distribution of stable isotopes of boron (δ11B) and chlorine (δ37Cl) in the waters of the Sinegorskoe field of high pCO2 mineral water and the Yuzhno-Sakhalinsk mud volcano (Sakhalin Island) along with chemical compositions and isotopy (18O, D, and 3H). It is shown that the investigated waters belong to formation waters, and variations of their chemical composition and isotopic characteristics (3H) are related to the water-rock-gas interaction, with insignificant influence of atmospheric precipitation. Measurements of chlorine and boron iso

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43

Araújo, Daniel, Geraldo Boaventura, Daniel Mulholland, et al. "Determining sedimentary material sources in a Brazilian urban lake using Zn stable isotope compositions of bottom sediments: a preliminary study." Geochimica Brasiliensis 34, no. 2 (2020): 130–37. http://dx.doi.org/10.21715/gb2358-2812.2020342130.

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Zinc isotopes ratios provide qualitative and quantitative information about contributions from different Zn sources in the environment. Here we present the results of a preliminary study to identify the main sources controlling Zn isotope signatures of sediments from Lake Paranoá (Brazil), an urban water reservoir. The Zn isotope ratios were measured by MC-ICP-MS and expressed as δ66/64Zn notation relative to the JMC 3-0749-L solution. The studied sediments showed a narrow isotopic range (+0.00 to +0.13 ‰; n = 10) similar to that reported for intensely weathered soils worldwide (from -0.4 to +

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44

Laskar, Amzad H., Rahul Peethambaran, Getachew A. Adnew, and Röckmann. "Measurement of 18O18O and 17O18O in atmospheric O2 using the 253 Ultra mass spectrometer and applications to stratospheric and tropospheric air samples." Rapid Communications in Mass Spectrometry 33 (March 7, 2019): 981–94. https://doi.org/10.1002/rcm.8434.

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We established a method for measuring clumped isotopes (18O18O and 17O18O) in atmospheric O2 using a high resolution stable isotope ratio mass spectrometer 253 ULTRA. We presented the details of the procedure of O2 extraction from air, measurement in the mass spectrometer, how to avoid isobaric interference in measuring 18O18O and 17O18O and precision of measurements. We also presented the calibration details using O2 equilibrated at different temperatures and discussed the conversion of clumped isotope values in absolute scale. Details of the calculations and measured values are presente

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45

Wagner, D. S., C. J. Markworth, C. D. Wagner, et al. "Ratio encoding combinatorial libraries with stable isotopes and their utility in pharmaceutical research." Combinatorial Chemistry & High Throughput Screening 1, no. 3 (1998): 143–53. http://dx.doi.org/10.2174/138620730103220120142733.

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Combinatorial libraries are an important tool for lead discovery in the pharmaceutical industry. Advances in high throughput screening coupled with combinatorial chemistry can significantly reduce the time to find lead compounds. A major difficulty in developing large combinatorial libraries is the ability to identify active compounds. This paper describes a rapid and sensitive encoding/decoding methodology that utilizes stable isotopes and mass spectrometry. The ability of mass spectrometry to precisely determine the intensity of isotopic abundances provides a unique encoding strategy employi

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46

Hachikubo, Akihiro, Taichi Nezu, Kaede Takizawa, and Satoshi Takeya. "Effect of Pressure on Hydrogen Isotope Fractionation in Methane during Methane Hydrate Formation at Temperatures Below the Freezing Point of Water." Methane 2, no. 2 (2023): 129–36. http://dx.doi.org/10.3390/methane2020010.

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Isotopic fractionation of methane between gas and solid hydrate phases provides data regarding hydrate-forming environments, but the effect of pressure on isotopic fractionation is not well understood. In this study, methane hydrates were synthesized in a pressure cell, and the hydrogen isotope compositions of the residual and hydrate-bound gases were determined. The δ2H of hydrate-bound methane formed below the freezing point of water was 5.7–10.3‰ lower than that of residual methane, indicating that methane hydrate generally encapsulates lighter molecules (CH4) instead of CH32H. The fraction

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47

Halder, J., S. Terzer, L. I. Wassenaar, L. J. Araguás-Araguás, and P. K. Aggarwal. "The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research." Hydrology and Earth System Sciences 19, no. 8 (2015): 3419–31. http://dx.doi.org/10.5194/hess-19-3419-2015.

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Abstract. We introduce a new online global database of riverine water stable isotopes (Global Network of Isotopes in Rivers, GNIR) and evaluate its longer-term data holdings. Overall, 218 GNIR river stations were clustered into three different groups based on the seasonal variation in their isotopic composition, which was closely coupled to precipitation and snowmelt water runoff regimes. Sinusoidal fit functions revealed phases within each grouping and deviations from the sinusoidal functions revealed important river alterations or hydrological processes in these watersheds. The seasonal isot

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48

Halder, J., S. Terzer, L. I. Wassenaar, L. J. Araguás-Araguás, and P. K. Aggarwal. "The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research." Hydrology and Earth System Sciences Discussions 12, no. 4 (2015): 4047–79. http://dx.doi.org/10.5194/hessd-12-4047-2015.

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Abstract. We introduce a new online global database of riverine water stable isotopes (Global Network of Isotopes in Rivers) and evaluate its longer-term data holdings. Overall, 218 GNIR river stations were clustered into 3 different groups based on the seasonal variation in their isotopic composition, which was closely coupled to precipitation and snow-melt water run-off regimes. Sinusoidal fit functions revealed periodic phases within each grouping and deviations from the sinusoidal functions revealed important river alterations or hydrological processes in these watersheds. The seasonal iso

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49

Badea, Silviu-Laurentiu, Violeta-Carolina Niculescu, and Andreea-Maria Iordache. "New Trends in Separation Techniques of Lithium Isotopes: A Review of Chemical Separation Methods." Materials 16, no. 10 (2023): 3817. http://dx.doi.org/10.3390/ma16103817.

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In terms of isotopic technologies, it is essential to be able to produce materials with an enriched isotopic abundance (i.e., a compound isotopic labelled with 2H, 13C, 6Li, 18O or 37Cl), which is one that differs from natural abundance. The isotopic-labelled compounds can be used to study different natural processes (like compounds labelled with 2H, 13C, or 18O), or they can be used to produce other isotopes as in the case of 6Li, which can be used to produce 3H, or to produce LiH that acts like a protection shield against fast neutrons. At the same time, 7Li isotope can be used as a pH contr

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50

Kurita, N., Y. Fujiyoshi, T. Nakayama, Y. Matsumi, and H. Kitagawa. "East Asian Monsoon controls on the inter-annual variability in precipitation isotope ratio in Japan." Climate of the Past 11, no. 2 (2015): 339–53. http://dx.doi.org/10.5194/cp-11-339-2015.

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Abstract. To elucidate the mechanism for how the East Asian Monsoon (EAM) variability have influenced the isotope proxy records in Japan, we explore the primary driver of variations of precipitation isotopes at multiple temporal scales (event, seasonal and inter-annual scales). Using a new 1-year record of the isotopic composition of event-based precipitation and continuous near-surface water vapor at Nagoya in central Japan, we identify the key atmospheric processes controlling the storm-to-storm isotopic variations through an analysis of air mass sources and rainout history during the transp

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