Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
49
datasets available to search
ShareScore release 0.9.0
Dataset results
49 results for “Isotope fractionation”
Supplementary Data to Kinetic oxygen isotope fractionation between water and aqueous OH- during hydroxylation of CO2
<p>In this dataset, we provide analytical data to <strong>Kinetic oxygen isotope fractionation between water and aqueous OH<sup>-</sup> during hydroxylation of CO<sub>2</sub></strong> by Bajnai and Herwartz (2021). Also deposited here is the R code that was used to generate the figures in the manuscript.</p>
Shelf–to–basin shuttle of highly fractionated chromium isotopes in the Arctic Ocean
<p>This dataset contains total dissolved chromium concentration and isotopic ratios in seawater associated with our paper "Shelf–to–basin shuttle of highly fractionated chromium isotopes in the Arctic Ocean" (submitted and accepted in Geochimica Cosmochimica Acta).</p> <p>The seawater samples were collected during the 2015 ArcticNet/Geotraces cruise aboard the CCGS Amundsen along the sections GN02 and GN03. </p> <p>All processing and measurements were done at the Saskatchewan Isotope Laboratory at the University of Saskatchewan (Canada).</p> <p>This data will also be available in the next GEOTRACES Intermediate Data Product (November 2025).</p> <p><span><strong>></strong> Cr_53_52_D_DELTA_BOTTLE_METADATA-2015CanadianArcticGEOTRACEScruise_OVERVIEW.csv : details the context of the expedition and the sampling/processing methods;</span></p> <p><span><strong>></strong> Cr_53_52_D_DELTA_BOTTLE_METADATA-2015CanadianArcticGEOTRACEScruise_DATA.csv : gives details on the data (<em>e.g.</em> units), as well as technical information associated with the measurements;</span></p> <p><span><strong>></strong> Cr_53_52_D_DELTA_BOTTLE_DATA-2015CanadianArcticGEOTRACEScruise.csv : chromium data associated with the paper.</span></p>
Dataset for: Oxygen isotope fractionation of O2 consumption through abiotic photochemical singlet oxygen formation pathways
<p>Dataset containing raw and treated isotope-ratio mass spectrometry data as well as O2 concentration data, accompanying the manuscript "Oxygen isotope fractionation of O2 consumption through abiotic photochemical singlet oxygen formation pathways".</p>
Dataset for "Atmospheric oxygen isotopic fractionation in clouds: a bin–resolved microphysics model approach"
<p>This dataset contains the raw model outputs for the paper titled "Atmospheric oxygen isotopic fractionation in clouds: a bin–resolved microphysics model approach" by Thibault Hiron and Andrea Flossmann.</p> <p>The structure of the data and the explaination for the filenames are to be found in the ReadMe.txt file.</p>
Acid fractionation during carbonate digestion with phosphoric acid – Assessment of two different techniques applied for clumped and stable isotope analysis using a Tuneable Infrared Laser Differential Absorption Spectrometer (TILDAS) [dataset]
<p>Date files : </p> <table> <tbody> <tr> <td> <p>Data 1 (Relationship between Mixing ratio difference of sample and WRG and D638 value).xlsx;Data 2 (Role of bulk isotope composition (δ628 & δ636) on Δ638).xlsx;Data 3 (CDES scale conversion).xlsx;Data 4 (VPDB scale conversion for d628 and d636).xlsx;Data 5 (Reference material values).xlsx;Data 6 (Break seal method acid fractionation factor of calcite).xlsx;Data 7 (IAB method acid fractionation factor of calcite).xlsx</p> </td> </tr> </tbody> </table>
Isotopic nitrogen fractionation and fermentation products from invitro culture experiments using rumen bacteria
<p>Dataset used in the paper titled : The extent of nitrogen isotopic fractionation in rumen bacteria is associated with changes in rumen nitrogen metabolism (DOI: 10.21203/rs.3.rs-2350552/v1). It contains individual data for isotopic nitrogen fractionation and fermentation products from invitro culture experiments using rumen bacteria</p>
Oxygen Isotope Fractionation by Anaerobic Ammonium-Oxidizing Bacteria
<p>Isotope composition of nitrite, nitrate, and water, as well as concentrations of nitrite, nitrate, and ammonium, were measured during the experiments with enrichment cultures of the anammox bacterium <em>Kuenenia stuttgartiensis. </em>Samples were collected sequentially during the course of the anammox activity until the complete consumption of nitrite.<em> </em>Isotope composition of nitrite and water was measured during the abiotic experiments to follow the abiotic oxygen isotope exchange between nitrite and water. The exchange was followed over the time period of 48 h.</p>
δ15N of nitric oxide produced under aerobic or anaerobic conditions from seven soils and their associated N isotope fractionations
<p>Measuring the nitrogen isotope compositions (δ<sup>15</sup>N) of nitric oxide (NO) from different sources helps to quantify the relative contributions of atmospheric NO<sub>x</sub>. Soil is one of the most important sources of atmospheric NO<sub>x</sub>, but only limited measurements on the δ<sup>15</sup>N of soil emitted NO exist, hampering our ability to partition sources to air pollution. Here we conducted soil incubations to measure the δ<sup>15</sup>N-NO under defined aerobic or anaerobic conditions, favoring either nitrification or denitrification. Soils were collected from seven sites spanning three ecosystems in northern China (two agricultural, two forest, and three grassland sites). We found that the δ<sup>15</sup>N-NO and their associated N isotope fractionations were significant different between anaerobic and aerobic conditions in seven soils. Under aerobic condition, the δ<sup>15</sup>N-NO ranged from -62‰ to -50‰ (averaged -56 ± 4‰), being significantly more negative (by 23‰) than those under anaerobic condition (-45‰ to -23‰, averaged -33 ± 7‰). The apparent N isotope fractionation for NO production under aerobic condition (<sup>15</sup><em>ε</em><sub>aerobic</sub> = 61 ± 3‰) was significantly higher (by 26‰) than under anaerobic condition (<sup>15</sup><em>ε</em><sub>anaerobic</sub> = 35 ± 6‰), with a small variability among ecosystem types. Our study demonstrates that the δ<sup>15</sup>N-NO from different soils are very different from fuel combustions (mainly from 0 to +20‰), supporting that measuring <sup>15</sup>N is a useful tool to partition the contributions of soil NO to atmospheric NO<sub>x</sub>. Our results also imply δ<sup>15</sup>N-NO produced by nitrification and denitrification distinctly different, as these two processes are dominant processes producing NO under aerobic and anaerobic conditions, respectively.</p>
Data for Lithium Isotope Fractionation during Intensive Felsic Magmatic Differentiation
<p>Data for original research of Lithium isotopes of granites in South China</p> <p>Table 1. Major elemental compositions (in wt.%) for granites from the Xihuashan and Yaogang Xian</p> <p>Table 2. Li isotopic and selected trace elemental compositions (ppm) for granites from the Xihuashan and Yaogangxian plutons</p> <p>Table 3. Li concentration and Li isotopic compositions of mineral separated from granites and greisen of the Xihuashan pluton</p> <p>Table S1. Chemical compositions of mica from granites in the Xihuashan pluton</p> <p>Table S2. Major and trace element compositions of K-feldspar from granites in the Xihuashan pluton.</p> <p>Table S3. Trace element compositions of zircon from granites in the Xihuashan pluton</p> <p>Table S4. Parameters used for the Rayleigh crystal fractionation modelling</p>
Pentavalent U reactivity impacts U isotopic fractionation during reduction by magnetite
<p>Original data pertaining to the manuscript 'Pentavalent U reactivity impacts U isotopic fractionation during reduction by magnetite' published in Environmental Science and Technology by Zezhen Pan, Luca Loreggian, Yvonne Roebbert, Barbora Bartova, Myrtille O.J.Y. Hunault, Stefan Weyer, Rizlan Bernier-Latmani.</p> <p><a href="https://doi.org/10.1021/acs.est.3c10324">https://doi.org/10.1021/acs.est.3c10324</a></p>
Supplementary XRD Material for "Experimental Constraints on Barium Isotope Fractionation during Adsorption-Desorption Reactions: Implications for Weathering and Erosion Tracer Applications"
<p><strong>Repository Overview:</strong> Supplementary powder X-ray diffraction (XRD) data for the study "Experimental Constraints on Barium Isotope Fractionation during Adsorption-Desorption Reactions: Implications for Weathering and Erosion Tracer Applications"</p> <p><strong>Data Provided:</strong> Powder X-ray diffractograms of the minerals used in the laboratory batch experiments. Pow</p> <p><strong>Minerals Analysed:</strong></p> <p><span>Clay Minerals:</span></p> <ul> <li>Kaolinite (KGa-2): purchased from the Clay Minerals Society (CMS).</li> <li>Montmorillonite (SWy-2): purchased from the Clay Minerals Society (CMS).</li> </ul> <p><span>Iron Oxyhydroxide Minerals:</span></p> <ul> <li>Goethite synthesised under alkaline conditions in the laboratories at the Department of Earth Sciences, University of Cambridge, following the method detailed in Schwertmann and Cornell (2008).</li> <li>2-line ferriydrite synthesised in the laboratories at the Department of Earth Sciences, University of Cambridge, following the method detailed in Schwertmann and Cornell (2008) methods.</li> </ul> <p><strong>XRD Methods:</strong></p> <ul> <li>Instrument and Set Up: Theta-Theta D8 Bruker Advance diffractometer with a Mo anode, Lynxeye XE-T PSD detector and 2 mm divergent slit.</li> <li>Sample Preparation: Zero-background monocrystalline silicon plate was used to minimize sample mass. The X-ray diffractogram of the silicon plate was measured prior to each sample measurement.</li> <li>Clay Minerals: 0.02° step size and a 3s step rate.</li> <li>Iron Oxyhydroxide Minerals: 0.03° increments and a 1s step rate.</li> </ul> <p><strong>Purpose of XRD Analyses:</strong></p> <ul> <li>To verify the correct synthesis of iron oxyhydroxide phases and to detect impurities.</li> <li>To monitor any mineralogical changes that occurred during adsorption-desorption reactions with water.</li> </ul> <p><strong>Data Format</strong></p> <table> <tbody> <tr> <td><strong>Column Name</strong></td> <td><strong>Description</strong></td> <td><strong>Unit</strong></td> </tr> <tr> <td>twotheta</td> <td>2θ</td> <td>°</td> </tr> <tr> <td>intensity</td> <td>intensity</td> <td>counts per second (cps)</td> </tr> <tr> <td>ID</td> <td>mineral ID</td> <td>unitless</td> </tr> <tr> <td>mineral</td> <td>mineral name</td> <td>unitless</td> </tr> <tr> <td>duration</td> <td>reaction duration</td> <td>minutes</td> </tr> </tbody> </table> <p><strong>Extra Notes</strong></p> <p>A reaction duration of zero minutes corresponds to an unreacted mineral sample.</p>
Contents and isotope carbon compositions (δ13C) of main biochemical fractions in organs at different growth stages in Phyllostachys edulis
<p><em><span>Phyllostachys edulis</span></em><span> is a spectacularly fast-growing species that completes its height growth within </span><span>two</span><span> months after the shoot emerges </span><span>without producing leaves</span><span> (fast-growing period, FGP). This phase was considered heterotrophic, the carbon necessary for the growth being transferred from the mature culms via the rhizomes, although previous studies observed key enzymes and anatomical features related to C<sub>4</sub>-carbon fixation in developing culms. </span><span>We tested whether C<sub>4</sub>-photosynthesis or dark-CO2 fixation through anaplerotic reactions significantly contributes to the FGP, resulting in differences in the natural abundance of </span><span>δ<sup>13</sup>C</span><span> in bulk organic matter and organic compounds. Further, pulse-<sup>13</sup>CO<sub>2</sub>-labelling was performed on developing culms, either from the surface or from the internal hollow, to ascertain whether significant CO<sub>2</sub> fixation occurs in developing culms.</span><span> δ<sup>13</sup>C of</span><span> young </span><span>shoots and developing culms were higher (-26.3–-26.9‰) </span><span>compared to all organs of mature bamboos (-28.4</span><span>–</span><span>-30.1</span><span>‰). </span>Developing culms contained chlorophylls, most observed in the skin tissues. After <span>pulse-<sup>13</sup>CO<sub>2</sub>-labelling, t</span>he polar fraction extracted from the skin tissues was slightly enriched in <sup><span>13</span></sup><span>C, </span>and only a weak <sup><span>13</span></sup><span>C </span>enrichment was observed in inner tissues<span>. Main carbon source sustaining the FGP was not assimilated by the developing culm, while a </span><span>limited anaplerotic fixation of respired CO<sub>2</sub></span><span> cannot be excluded and is </span>more likely than <span>C<sub>4</sub>-</span>photosynthetic carbon fixation<span>.</span></p>
Oxygen isotope constraints on the ventilation of the modern and glacial Pacific: Water fractions and the associated errors
<p>There is two associated datasets linked to the study: Oxygen isotope constraints on the ventilation of the modern and glacial Pacific.</p> <p>One whch contains the values of the 4 end-memebrs defined in the study, and the other one represent the error associated to the reconstruction of each parameter based on the fractions calculated.</p>
δ15N of nitric oxide produced under aerobic or anaerobic conditions from seven soils and their associated N isotope fractionations
Open the record for dataset details and reuse information.
Inter-method differences (SIMS vs. IRMS) in oxygen isotope fractionation: Insights from Chinook salmon otoliths
Open the record for dataset details and reuse information.
Data from: Amino acid δ15N underestimation of cetacean trophic positions highlights poor understanding of isotopic fractionation in higher marine consumers
Open the record for dataset details and reuse information.
Contents and isotope carbon compositions (δ13C) of main biochemical fractions in organs at different growth stages in Phyllostachys edulis
Open the record for dataset details and reuse information.
Carbon and hydrogen isotope fractionation during uncultured aerobic oxidation of short-chain alkanes that discharged from a natural hydrothermal system
<p>Aerobic oxidation of short-chain alkanes was observed in gas samples from the Lutao intertidal hydrothermal vents in Taiwan, during storage without adding strains and replenishing substrates at 20 <sup>o</sup>C up to 29 months. The carbon isotope fractionation factors (<em>ε<sub>C</sub></em>) of methane (C<sub>1</sub>), ethane (C<sub>2</sub>), and propane (C<sub>3</sub>), were calculated using the Rayleigh fractionation equation to be -37.1 ± 7.5‰, -14.8 ± 4.8‰, and -4.7 ± 5.2‰, respectively. The hydrogen isotope fractionation factor (<em>ε<sub>H</sub></em>) of methane was determined to be -281 ± 187‰. DNA sequencing of the 16sRNA gene in the vent fluids suggests that aerobic oxidation is dominated by methanotrophs of the genera <em>Methylomicrobium</em> and <em>Methylophaga,</em> which use the ribulose monophosphate pathway (RuMP). The degrees of isotope fractionation (<em>ε<sub>C</sub></em> and <em>ε<sub>H</sub></em> values) herein are larger than previously reported values, possibly due to the limited O<sub>2</sub> supply and low abundance of aerobic methane-oxidizing bacteria in the experiments. Since the fractionation factor of methane is higher than those of ethane and propane, the aerobic oxidation of thermogenic or microbial alkanes could produce carbon isotope reversal, which is frequently noted as a trait of abiotic hydrocarbons. This work demonstrates that in addition to anaerobic microbial oxidation, aerobic oxidation with a low cell density can also produce significant isotope fractionation of alkanes in geological closed/semi-closed environments that are characterized by moderate temperatures and a limited supply of substrates and O<sub>2</sub>; these environments include cold seeps, mud volcanoes, and low-temperature hydrothermal aquifers/reservoirs.</p>
Nitrogen isotope fractionation during archaeal ammonia oxidation: coupled estimates from measurements of residual ammonium and accumulated nitrite
<p>The naturally occurring nitrogen (N) isotopes, <sup>15</sup>N and <sup>14</sup>N, exhibit different reaction rates during many microbial N transformation processes, which results in N isotope fractionation. Such isotope effects are critical parameters for interpreting natural stable isotope abundances as proxies for biological process rates in the environment across scales. The kinetic isotope effect of ammonia oxidation (AO) to nitrite (NO<sub>2</sub><sup>-</sup>), performed by ammonia-oxidizing archaea (AOA) and bacteria (AOB), is generally ascribed to the enzyme ammonia monooxygenase (AMO), which catalyzes the first step in this process. However, the kinetic isotope effect of AMO, or ε<sub><i>AMO</i></sub><span><span> </span></span>, has been typically determined based on isotope kinetics during product formation (cumulative product, NO<sub>2</sub><sup>-</sup>) alone, which may have overestimated ε<sub><i>AMO</i></sub><span><span> </span></span> due to possible accumulation of chemical intermediates and alternative sinks of ammonia/ammonium (NH<sub>3</sub>/NH<sub>4</sub><sup>+</sup>). Here, we analyzed <sup>15</sup>N isotope fractionation during archaeal ammonia oxidation based on both isotopic changes in residual substrate (RS, <span>NH<sub>4</sub><sup>+</sup></span>) and cumulative product (CP, NO<sub>2</sub><sup>-</sup>) pools in pure cultures of the soil strain <i>Nitrososphaera viennensis</i> EN76, and in highly enriched cultures of the marine strain <i>Nitrosopumilus adriaticus</i> NF5, under non-limiting substrate conditions. We obtained ε<sub><i>AMO</i></sub><span><span> </span></span> values of 31.9-33.1‰ for both strains based on RS (<span>δ<sup>15</sup>NH<sub>4</sub><sup>+</sup>), and show that </span>estimates based on CP (δ<sup>15</sup>NO<sub>2</sub><sup>-</sup>) give larger isotope fractionation factors by 6-8‰. Complementary analyses showed that, at the end of the growth period, microbial biomass was <sup>15</sup>N-enriched<span> (10.1</span>‰),<span> whereas </span>nitrous oxide (N<sub>2</sub>O) was highly <sup>15</sup>N depleted (-38.1‰) relative to the initial substrate. Although we did not determine the isotope effect of <span>NH<sub>4</sub><sup>+</sup> </span>assimilation (biomass formation) and N<sub>2</sub>O production by AOA, our results nevertheless show that the discrepancy between ε<sub><i>AMO</i></sub><span><span> </span></span> estimates based on RS and CP might have derived from incorporation of <sup>15</sup>N-enriched residual NH<sub>4</sub><sup>+</sup> after AMO reaction into microbial biomass, and that N<sub>2</sub>O production did not affect isotope fractionation estimates significantly.</p>
Alkenone carbon isotopic fractionation and sea surface temperature trends from 30 to 16 Ma. Sites IODP 1406, ODP 1168 and ODP 925
Open the record for dataset details and reuse information.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.