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54 results for “Uranium”
Persistence of the isotopic signature of pentavalent uranium in magnetite
<p>Original data pertaining to the manuscript 'Persistence of the isotopic signature of pentavalent uranium in magnetite' published in Environmental Science and Technology by Zezhen Pan, Yvonne Roebbert, Aaron Beck, Barbora Bartova, Tonya Vitova, Stefan Weyer, Rizlan Bernier-Latmani.</p> <p><a href="https://doi.org/10.1021/acs.est.1c06865">https://doi.org/10.1021/acs.est.1c06865</a></p>
Nanofibers of solid-solution thorium(IV)-uranium(IV) oxides by electrospinning_experimental dataset
<p>Raw experimental data for Kundrát et al., Nanofibers of solid-solution thorium(IV)-uranium(IV) oxides by electrospinning, Journal of Nuclear Materials 566 (2022) 153731. </p>
Ocean-atmosphere changes in the midlatitude North Pacific over the last 330 ka: Dust, biogenic sediment and authigenic uranium accumulation at Shatsky Rise — Dataset
<p><strong>Title</strong>: Ocean-atmosphere changes in the midlatitude North Pacific over the last 330 ka: Dust, biogenic sediment and authigenic uranium accumulation at Shatsky Rise — Dataset</p> <p><strong>Version</strong>: 1.0</p> <p><strong>Date of Release</strong>: July 03, 2022</p> <p><strong>Last Update</strong>: July 03, 2022</p> <p><strong>Identifier</strong>: 10.5281/zenodo.6791726</p> <p><strong>Permalink</strong>: <a href="https://doi.org/10.5281/zenodo.6791725">https://doi.org/10.5281/zenodo.6791725</a></p> <p><strong>Associated publication</strong>: </p> <p><strong>Link to publication preprint</strong>: </p> <p><strong>Suggested citation</strong>: Please reference the associated publication above when using any datasets or materials in this repository.</p> <p><strong>Contact information</strong>: Christopher W. Kinsley, ckinsley@mit.edu OR cwkinsley@gmail.com</p> <p><strong>Dates of data collection and generation</strong>: </p> <p>---------------</p> <p><strong>DESCRIPTION OF DATA</strong></p> <p>This data repository contains the following dataset. We refer the user to the original manuscript (see above) and the text of the Supporting Information published alongside this manuscript for additional general information regarding the collection and generation of these data.</p> <p>DATA TABLES FOR ALL CORE SITES</p> <ul> <li> <p><strong>Kinsley et al. (2022) P&P - Data Tables for ODP 198-1208A</strong><strong> core - v1</strong>: This Excel workbook contains all data used in the study for the ODP 198-1208A core site, taken by the R/V JOIDES Resolution close to the center of the Central High of Shatsky Rise in the western North Pacific Ocean during Ocean Drilling Program Leg 198. This includes the age control and age model, biogenic %s, U-Th isotopic measurements, and <sup>230</sup>Th-normalized flux data. All previously published data is noted as such and referenced.</p> </li> </ul>
Combined data file for Jokinen et al. "Depth and intensity of the sulfate-methane transition zone control sedimentary molybdenum and uranium sequestration in a eutrophic low-salinity setting", Applied Geochemistry 122, 2020
<p>The datafile contains all the new raw data presented in the figures in the publication.</p>
Preparation of ultrafine fibrous uranium dioxide by electrospinning_experimental dataset
<p>This dataset contains the raw underlying data for the paper "Preparation of ultrafine fibrous uranium dioxide by electrospinning" available in open acess under DOI 10.5281/zenodo.3553488. </p>
Nitrogen activation and cleavage by a multimetallic uranium complex
<p>Multimetallic-multielectron cooperativity plays a key role in the metal-mediated cleavage of N2 to nitrides (N3-) In particular, low-valent uranium complexes coupled with strong alkali metal reducing agents can lead to N2 cleavage, but often, it is ambiguous how many electrons are transferred from the uranium centers to cleave N2. Herein, we designed new dinuclear uranium nitride complexes presenting a combination of electronically diverse ancillary ligands to promote the multielectron transformation of N2. Two heteroleptic diuranium nitride complexes, [K{UIV(OSi(OtBu)3)(N(SiMe3)2)2}2(m-N)] (1) and [Cs{UIV(OSi(OtBu)3)2(N(SiMe3)2)}2(u-N)] (3-Cs), containing different combinations of OSi(OtBu)3 and N(SiMe3)2 ancillary ligands, were synthesized. We found that both complexes could be reduced to their U(III)/U(IV) analogues, and the complex, [K2{UIV/III(OSi(OtBu)3)2(N(SiMe3)2)}2(m-N)] (6-K), could be further reduced to a putative U(III)/U(III) species that is capable of promoting the 4e reduction of N , yielding the N24- complex [K3{UV(OSi(OtBu)3)2(N(SiMe3)2)}2(m-N)(m-h2:h2-N2)], 7. Parallel N2 reduction pathways were also identified, leading to the isolation of N2 cleavage products, [K3{UVI(OSi(OtBu)3)2(N(SiMe3)2)(^N)}(m- N)2{UV(OSi(OtBu)3)2(N(SiMe3)2)}]2, 8, and [K4{(OSi(OtBu)3)2UV)(^N)}(m-NH)(m-k2:C,N-CH2SiMe2NSiMe3)- {UV(OSi(OtBu)3)2][K(N(SiMe3)2]2, 9. These complexes provide the first example of N2 cleavage to nitride by a uranium complex in the absence of reducing alkali metals,</p>
Dataset for Paul et al., "Revisiting the applicability and constraints of molybdenum and uranium-based paleo redox proxies: comparing two contrasting sill fjords", Biogeosciences, 2023
<p>The datafile contains the solid phase data for Gullmar Fjord (GF-117) and Koljö Fjord (KF-43), presented in Figures 3, 4 and 6 in the publication:</p> <ol> <li>pore water data (SO<sub>4</sub><sup>2-</sup>, ΣH<sub>2</sub>S, Fe, Mn, Mo, and U)</li> <li>solid-phase carbon and nitrogen data (TOC, TN, C/N, OC<sub>terr</sub> and OC<sub>phyt</sub>)</li> <li>solid-phase sequential extraction data (Mo, U, Fe, Mn, Al, Ca, and S)</li> <li>Mo and U-Enrichment Factors (EF)</li> </ol>
Proteomic profiling of serum extracellular vesicles from uranium-exposed miners
Open the record for dataset details and reuse information.
Data from: Uranium and Radium in groundwater and incidence of colorectal cancer in Georgia counties, USA: An ecologic study
Open the record for dataset details and reuse information.
Kinetic Model Data: Effect of Calcium on the Bioavailability of Dissolved Uranium (VI) in Plant Roots under Circumneutral pH
We integrated field measurements, hydroponic experiments, microscopy, and spectroscopy to investigate the effect of Ca(II) on dissolved U(VI) uptake by plants in 1 mM HCO3 − solutions at circumneutral pH. The accumulation of U in plants (3.1−21.3 mg kg−1) from the stream bank of the Rio Paguate, Jackpile Mine, New Mexico served as a motivation for this study. Brassica juncea was the model plant used for the laboratory experiments conducted over a range of U (30−700 μg L−1) and Ca (0−240 mg L−1) concentrations. The initial U uptake followed pseudo-second-order kinetics. The initial U uptake rate (V0) ranged from 4.4 to 62 μg g−1 h−1 in experiments with no added Ca and from 0.73 to 2.07 μg g−1 h−1 in experiments with 12 mg L−1 Ca. No measurable U uptake over time was detected for experiments with 240 mg L−1 Ca. Ternary Ca−U−CO3 complexes may affect the decrease in U bioavailability observed in this study. Elemental X-ray mapping using scanning transmission electron microscopy−energy dispersive spectrometry detected U−P-bearing precipitates within root cell walls in water free of Ca. These results suggest that root interactions with Ca and carbonate in solution affect the bioavailability of U in plants. This study contributes relevant information to applications related to U transport and remediation of contaminated sites.
Uranium accumulation in Brassica juncea plant facilitated by calcium in carbonate water
The role of calcium (Ca) on the cellular distribution of U(VI) in Brassica juncea roots and root-to-shoot translocation was investigated using hydroponic experiments, microscopy, and spectroscopy. Uranium accumulated mainly in the roots (727−9376 mg kg−1) after 30 days of exposure to 80 μM dissolved U in water containing 1 mM HCO3 − at different Ca concentrations (0−6 mM) at pH 7.5. However, the concentration of U in the shoots increased 22 times in experiments with 6 mM Ca compared to 0 mM Ca. In the Ca control experiment, transmission electron microscopy−energy-dispersive spectroscopy analyses detected U−P-bearing precipitates in the cortical apoplast of parenchyma cells. In experiments with 0.3 mM Ca, U−P-bearing precipitates were detected in the cortical apoplast and the bordered pits of xylem cells. In experiments with 6 mM Ca, U−P-bearing precipitates aggregated in the xylem with no apoplastic precipitation. These results indicate that Ca in carbonate water inhibits the transport and precipitation of U in the root cortical apoplast and facilitates the symplastic transport and translocation toward shoots. These findings reveal the considerable role of Ca in the presence of carbonate in facilitating the transport of U in plants and present new insights for future assessment and phytoremediation strategies.
In-situ, time resolved monitoring of uranium in BFS:OPC grout. Part 1: Corrosion in water vapour.
<p>Uranium encapsulated in grout was exposed to water vapour for extended periods of time. Through synchrotron x-ray powder diffraction and tomography measurements, uranium dioxide was determined the dominant corrosion product over a 50-week time period. The oxide growth rate initiated rapidly, with rates comparable to the U + H<sub>2</sub>O reaction. Over time, the reaction rate decreased and eventually plateaued to a rate similar to the U + H<sub>2</sub>O + O<sub>2</sub> reaction. This behaviour was not attributed to oxygen ingress, but instead the decreasing permeability of the grout, limiting oxidising species access to the metal surface.</p>
Compiled bulk rock uranium, thorium and loss on ignition (LOI) concentrations in serpentinites and altered oceanic crust
<p>The dataset includes a compilation of published uranium, thorium and loss on ignition (LOI) concentrations for bulk rock serpentinite samples organized by tectonic setting. All references are included in the file.</p>
Compiled bulk rock uranium and ferric iron over total iron for bulk rock serpentinites
<p>This dataset is a compilation of published uranium and Fe3+/Fetot in bulk rock serpentinites. All references are included in the datasheet.</p>
Compiled mineral uranium and thorium concentrations in serpentinites and iron oxides
<p>This dataset includes mineral (serpentine, carbonate, brucite, tremolite, perovskite, magnetite, hematite, goethite) uranium and thorium concentrations and the associated publication references.</p>
Uranium isotope constraints on the pre-deposition time of Asian dust to the North Pacific Ocean: Implications for provenance and iron supply
<p>This dataset presents uranium isotope data covering a 300,000-year period retrieved from Ocean Drilling Program site 1209B in the North Pacific Ocean. Additionally, it incorporates uranium-neodymium isotope data sourced from multiple deserts in China, providing a comprehensive reexamination of the origin of dust in the North Pacific region.</p>
Decoding the Pair Distribution Function of Uranium in Molten Fluoride Salts from X-ray Absorption Spectroscopy Data by Machine Learning
<p>The repo contains all codes and data related to the JPCC publication entitled "Decoding the Pair Distribution Function of Uranium in Molten Fluoride Salts from X-ray Absorption Spectroscopy Data by Machine Learning"</p>
Uranium supply chain trade data
<p>Global trade data for natural uranium, enriched uranium and depleted uranium from 2013 to 2024. </p> <p>Complex network indicator results for natural uranium, enriched uranium, and depleted uranium.</p>
Delivery of a Masked Uranium(II) by an Oxide-Bridged Diuranium(III) Complex
<p>This upload contains raw data (NMR, X-Ray, Elemental Analysis) files for the article.</p>
Tracking the provenance of aeolian loess in northeastern China by uranium isotopes
<p>The dataset provides U-Nd-Sr isotopic compositions of the loess deposits in northeastern China and the potential source areas, including the Otindag Sandy Land, the Horqin Sandy Land, and the Hulun Buir Sandy Land to better understand the transport of aeolian dust in the region.</p>
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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