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141 results for “isotopic composition”
Dark septate endophytes and arbuscular mycorrhizal fungi (Paris-morphotype) affect the stable isotope composition of 'classically' non-mycorrhizal plants
<p>The vast majority of terrestrial plants exchange nutrients with fungal partners forming different mycorrhizal types. The minority of plants considered as non-mycorrhizal, however, are not necessarily free of any fungi, but are frequently colonized by elusive fungal endophytes, such as <i>dark septate endophytes</i> (<i>DSE</i>) or <i>fine root endophytes</i> (<i>FRE</i>). While a functional role of <i>FRE</i> in improvement of nutrient gain was recently elucidated, the function of <i>DSE</i> is still in discussion and was here addressed for 36 plant species belonging to the families Equisetaceae, Cypereaceae and Caryophyllaceae.</p> <p>Molecular and microscopic staining approaches were conducted to verify the presence of <i>DSE</i> in the investigated species. Stable isotope natural abundances of the elements carbon, nitrogen, hydrogen and oxygen and total nitrogen concentrations were analyzed for the respective species of the target plant families and accompanying mycorrhizal and non-mycorrhizal (Brassicaceae) plant species.</p> <p>Staining approaches confirmed the presence of <i>DSE</i> in all investigated species within the families Equisetaceae, Cyperaceae and Caryophyllaceae. A co-colonization with <i>Paris</i>-type arbuscular mycorrhiza (AM) was occasionally found by staining and molecular approaches in species of the Equisetaceae. Species of the Equisetaceae, Cyperaceae and Caryophyllaceae were significantly <sup>15</sup>N-enriched in comparison to accompanying plants. In addition, a significant <sup>13</sup>C and <sup>2</sup>H enrichment and increased total nitrogen concentrations were found for representatives of the Equisetaceae.</p> <p>The <sup>15</sup>N-enrichment found here for representatives of Equisetaceae, Cyperaceae and Caryophyllaceae provides evidence for a functional role of the ubiquitous <i>DSE</i> fungi. <i>DSE</i> fungi obviously provide access to <sup>15</sup>N-enriched soil organic compounds probably in exchange for organic carbon compounds from plant photosynthesis. As indicated by additional <sup>13</sup>C- and <sup>2</sup>H-enrichments, representatives of the Equisetaceae apparently gain simultaneously organic carbon compounds from their AM fungi of the <i>Paris</i>-morphotype. Thus, species of the Equisetaceae have to be considered as partially, or in case of the achlorophyllous fertile Equisetum arvense, as fully mycoheterotrophic at least in some stages of their life cycle.</p> <p>So far mostly underappreciated fungi classified as <i>DSE</i> are suggested to occupy an ecologically relevant role similar to mycorrhizae and the occurrence of simultaneous functions of <i>DSE</i> and AM fungi in Equisetaceae is proposed.</p>
Nitrogen isotope composition of amino acids reveals trophic partitioning in two sympatric amphipods
<p>According to ecological theory two species cannot occupy the same niche. We tested the extent to which two sympatric deposit-feeding amphipods, Monoporeia affinis and Pontoporeia femorata, partition trophic resources by applying nitrogen isotope analyses (δ15N) of amino acids. We found that trophic position (TP), and resynthesis index (∑V; a proxy for degradation status of ingested material prior to assimilation by the consumer) differ between species. The surface-feeding M. affinis had higher TP and intermediate ∑V; both pointing to a large contribution of metazoans in its diet. P. femorata, which feeds in the sub-surface layers, had lower TP and a bimodal distribution of the ∑V values, supporting previous experimental evidence of a larger feeding niche. We also evaluated whether TP and ∑V values have consequences for amphipod fecundity and embryo viability and found that embryo viability in M. affinis was negatively linked to TP. Our results indicate that the amino acid-δ15N data paired with information about reproductive status are useful for detecting differences in the trophic ecology of sympatric amphipods. Key words: Compound-specific stable nitrogen isotope analyses, amino acids, trophic level, resynthesis index, reproductive status, Baltic Sea.</p>
Temperature control on high-resolution SIMS oxygen isotopic compositions in Porites coral skeletons
<p>The dataset includes all data for "Temperature control on high-resolution SIMS oxygen isotopic compositions in Porites coral skeletons" by Zou et al. from Guangzhou Institute of Geochemistry.</p>
Data and code to accompany the publication: Chemical and Pb isotope composition of phenocrysts from bentonites constrains the chronostratigraphy around the Cretaceous-Paleogene boundary in the Hell Creek region, Montana in G3
<p>EPMA data and analysis for Ikckert et al., 2015</p>
Observations of molecular hydrogen (H2) mixing ratio and stable isotopic composition (deuterium content) at the Cabauw tall tower in the Netherlands
<p>This zip file contains the final corrected data that were used for the journal article "Observations of molecular hydrogen mixing ratio and stable isotopic composition at the Cabauw tall tower in the Netherlands" by Batenburg et al., Atmospheric Environment, 2016, doi:10.1016/j.atmosenv.2016.09.058<br> <br> Please cite the original AtmosEnv article when using these data.<br> The paper also contains more information about how these data were collected and calibrated, and on how the quality control flags were assigned.</p> <p>All samples were collected at the Cabauw tower, at the CESAR site (51.971° N, 4.927° E, http://www.cesar-observatory.nl/).<br> H2 and deltaD(H2) are calibrated using one to four laboratory reference air cylinders, depending on measurement period.<br> The H2 mixing ratio of the reference cylinders was determined by UHEI-IUP, MPI-BGC, or the IMAU isotope laboratory.<br> The deltaD(H2) of the reference cylinders is, sometimes indirectly, linked to the VSMOW scale by measurements of air mixtures containing H2 standards of known isotopic composition.<br> H2 scale: MPI2009, Jordan and Steinberg, AMT, 2011, doi:10.5194/amt-4-509-2011<br> deltaD(H2) units: permil deviation from VSMOW, Gonfiantini et al., IAEA-TECDOC-825, IAEA</p> <p>Times are UTC. </p> <p><br> The corresponding author can be reached through annekebatenburg@gmail.com for questions.</p>
Chemical and isotopic composition data
<p><span><span><span>This dataset is accompanying the submission of the manuscript "Rock weathering characteristics and carbon sink in the Liujiang Basin, North China". </span></span></span><span><span><span>It contains experimental data describing the concentration of ion and isotopic composition of river water in the study area basin. </span></span></span><span><span><span>These data are used for the calculation of chemical weathering carbon sinks and tracing cation sources described in the paper. </span></span></span><span><span><span>The data is provided in the form of an Excel file.</span></span></span></p>
Is the isotopic composition of precipitation a robust indicator for reconstructions of past tropical cyclones frequency? A case study on Réunion Island from rain and water vapor isotopic observations
<p>Isotopic composition of precipitation and water vapor and LMDZ-iso and ECHAM6-wiso simulations associated with the manuscript:</p> <p>Françoise Vimeux, Camille Risi, Christelle Barthe, Sören François, Alexandre Cauquoin, Olivier Jossoud, Jean-Marc Metzger, Olivier Cattani, Bénédicte Minster, and Martin Werner (2024). Is the isotopic composition of precipitation a robust indicator for reconstructions of past tropical cyclones frequency? A case study on Réunion Island from rain and water vapor isotopic observations. Journal of Geophysical Research: Atmospheres, 129, e2023JD039794. https://doi.org/10.1029/2023JD039794</p>
Isotopic analysis: How our community analyzes soil and plant water samples for their isotopic composition
<p>As part of a project to develop a common methodological framework for water sampling, extraction, and isotopic analysis to study vegetation water use, we conducted an informal survey of current practices. A simple questionnaire via Google form was sent out to all members of the WATer isotopeS in the critical zONE (WATSON) European Cooperation in Science and Technology (COST) Action (#19120, 2020-2024) between July and September 2021. In this repository, we've included a brief write-up of this survey and the survey data. </p>
DATASET: Isotope Ratios, Carbon and Nitrogen Concentrations, and Phytoplankton Composition Data from the ACE Expedition
<p>This dataset represents the averaged observations derived from the Antarctic Circumnavigation Expedition (ACE - 2016/2017) and has been utilized for the analyses presented in the publication: "A circum-Antarctic plankton isoscape: Carbon export potential across the summertime Southern Ocean". It encompasses a comprehensive suite of biogeochemical measurements, specifically the isotopic ratios (δ13C, δ15N) and concentrations of carbon and nitrogen in Suspended Particulate Matter (SPM). Additionally, it includes data from High-Performance Liquid Chromatography (HPLC) analyses (i.e., Total Chl-a and fractions of pico-, nano-, and micro-phytoplankton).</p><p>This dataset also contains the outputs of our calculations based on the two-endmember isotope mixing model (Fawcett et al., 2011), complemented by the Rayleigh model (Mariotti et al., 1981) to deduce the fraction of phytoplankton biomass originating from new nitrogen source (New Production).</p>
Dataset for "Low blank sampling method for measurement of the nitrogen isotopic composition of atmospheric nitrogen oxide "
<p>The final dataset used in the manuscript "Low blank sampling method for measurement of the nitrogen isotopic composition of atmospheric nitrogen oxide<sub> </sub>" by Kamezaki et al. The dataset contains NOx concentration and nitrogen isotopic composition observed at Yoyogi and Tsukuba sites in Japan. Additionally, the data used in the paper are also included. Raw data are available upon request from the author.</p>
Diagenesis decreasing the Mo isotopic composition in estuarine systems: Implications for constraining its riverine input to ocean
<p>Physical and chemical characteristics of water and particulate samples in the August and December 2014 cruises and characteristics of water samples from the July 2016 and February 2017 cruises.</p>
Alkyl lipid distribution, elemental composition and compound-specific 14C isotope composition in marine and terrestrial sedimentary archives from sub-Antarctic South Georgia
<p>The dataset comprises elemental data, alkyl lipid data and radiocarbon (14C) data that was obtained on sediment samples from sub-Antarctic South Georgia. The sediments were collected from a range of different sites, including lakes, peat deposits, a marine inlet and a fjord during RV Polarstern expedition PS81 in 2013. More details on the study sites, sampling and data evaluation can be found in Berg et al. (submitted manuscript to JGR Biogeochemistry).</p>
The isotopic composition of the French Illimani ice core in the Bolivian Andes supports the east-west South American precipitation dipole from the last deglaciation to the mid-Holocene
<p>Isotopic composition (deuterium and deuterium excess) of the French Illimani ice core drilled in 1999 with a revised dating detailed in the following manuscript:</p> <p>Françoise Vimeux and Amaëlle Landais, 2025. The isotopic composition of the French Illimani ice core in the Bolivian Andes supports the east-west South American precipitation dipole from the last deglaciation to the mid-Holocene. Quaternary Science Reviews 347, https://doi.org/10.1016/j.quascirev.2024.109098.</p>
Mercury isotopic compositions in fine particles and offshore surface seawater in a coastal area of East China: Implication for Hg sources and atmospheric transformations
<p>Original data:</p> <p>sheet 1: PHg concentration</p> <p>sheet2: Chemical components in PM2.5</p> <p>sheet3: PHg isotopes</p> <p>sheet4: Seawater Hg isotopes</p>
Riparian cottonwood trees and adjacent river sediments have different microbial communities and produce methane with contrasting carbon isotope compositions
<p class="Abstract">Rivers and their adjacent riparian forests are intimately linked by the exchange of water, nutrients, and organic matter. Both riparian cottonwood trees and adjacent river sediments host microbial communities including archaeal methanogens, supporting methane production and emission to the atmosphere. Here we combine microbial community and stable isotope analyses to characterize the drivers of methane cycling in distinct anoxic habitats (river sediments versus riparian cottonwood stems) in the Oldman River, southern Alberta (Canada). We demonstrate that, differences in the chemical characteristics of organic matter support divergent microbial communities that generate methane from distinct metabolic pathways. Organic matter in river sediments had C/N ratios approximately 50-fold lower than in tree stems and had more diverse dissolved organic components. Contrasting substrate availability between river sediment and tree stems was likely the primary mechanism for the observed differences in bacterial and methanogen community compositions, and greater microbial diversity in river sediments than in tree stems. The methane carbon isotope composition (δ<sup>13</sup>C values) differed for the tree stem (-103.6 to -70.6‰) and river sediment (-55.1 to -48.4‰) environments, suggesting that methane was primarily produced via CO<sub>2</sub>-reduction in tree stems by Methanobacteriales, while river sediments produced more methane through acetate fermentation primarily by Methanosarcinales. This study demonstrates the importance of organic matter quality and microbial community composition in driving metabolic processes contributing to methane production and emission in rivers and adjacent riparian forests.</p>
Elemental and S isotopic composition data for "Sulfur isotopic fractionation of the youngest Chang'e-5 basalts: Constraints on the magma degassing and geochemical features of the mantle source"
<p>Data for "Sulfur isotopic fractionation of the youngest Chang'e-5 basalts: Constraints on the magma degassing and geochemical features of the mantle source".</p>
Chemical and Cl isotopic composition data for "Extremely Large Cl Isotopic Fractionation in Chang'e-5 Impact Glass Beads"
<p>Data for "Extremely Large Cl Isotopic Fractionation in Chang'e-5 Impact Glass Beads".</p>
Daily, monthly and annual data from A decade (2008-2017) of water stable-isotope composition of precipitation at Concordia Station, East Antarctica
<p><span>A ten-year record of oxygen and hydrogen isotopic composition of precipitation is here presented: from 2008 to 2017, 1483 daily precipitation samples were collected all-year round on a raised platform at Concordia Station, East Antarctica.</span></p> <p><span>The dataset is discussed in the following pubblication:</span></p> <p><span>Dreossi, G., Masiol, M., Stenni, B., Zannoni, D., Scarchilli, C., Ciardini, V., Casado, M., Landais, A., Werner, M., Cauquoin, A., Casasanta, G., Del Guasta, M., Posocco, V., and Barbante, C.: A decade (2008–2017) of water stable-isotope composition of precipitation at Concordia Station, East Antarctica, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-2813, 2023.</span></p> <p><span>The dataset includes 3 main datasheets:</span></p> <p><span>1. DAILY data with date, daily dataset for isotopes (δ<sup>18</sup>O, δ<sup>2</sup>H, d-excess), starting and ending date and hour, temperature and RH from the AWS (aws.temp and aws.RH, respectively) and the ERA5 temperature and total precipitation (era5.t2m and era5.tp, respectively);</span></p> <p><span>2. MONTHLY data with months, monthly averages for isotopes (δ<sup>18</sup>O, δ<sup>2</sup>H, d-excess), monthly averages for isotopes weighted for AWS temperature (δ<sup>18</sup>O.aws.temp, δ<sup>2</sup>H.aws.temp, d-excess.aws.temp), monthly averages for isotopes weighted for ERA5 total precipitation (δ<sup>18</sup>O.era5.tp, δ<sup>2</sup>H.era5.tp, d-excess.era5.tp), monthly averages for air temperature and RH from the AWS (aws.temp and aws.RH, respectively) and the ERA5 temperature and total precipitation (era5.t2m and era5.tp, respectively);</span></p> <p><span>3. ANNUAL data with years, annual averages for isotopes (δ<sup>18</sup>O, δ<sup>2</sup>H, d-excess), annual averages for isotopes weighted for AWS temperature (δ<sup>18</sup>O.aws.temp, δ<sup>2</sup>H.aws.temp, d-excess.aws.temp), annual averages for isotopes weighted for ERA5 total precipitation (δ<sup>18</sup>O.era5.tp, δ<sup>2</sup>H.era5.tp, d-excess.era5.tp), annual averages for air temperature and RH from the AWS (aws.temp and aws.RH, respectively) and the ERA5 temperature and total precipitation (era5.t2m and era5.tp, respectively).</span></p>
Alteration of carbonate clumped isotope composition by burial heating in foreland sediments of the Himalaya- Raw data and tables
<p>The file "Raw_data" includes all raw data relevant to the study titled "Alteration of carbonate clumped isotope composition by burial heating in foreland sediments of the Himalaya". It contains four sheets:</p> <p>1- General information about data processing in our lab and the specific parameters for the analytical session relevant to this study.</p> <p>2-Raw data for all individual analyses of unknown samples.</p> <p>3-Raw data for all individual analyses of carbonate standards.</p> <p>4-Raw data for all individual analyses of CO2 gases.</p> <p>The file "complete data and tables" includes all tables in the manuscript and all data needed to create the figures in the manuscript. </p>
Nickel and chromium stable isotopic composition of ureilites: implications for the Earth's core formation and differentiation of the ureilite parent body
<p>We report the first Ni and Cr stable isotope data for ureilite meteorites that are the mantle residue of a carbon-rich differentiated planet. Ureilites have similar Ni stable isotope compositions as chondrites, suggesting the core-mantle differentiation of ureilite parent body did not fractionate Ni isotopes. Since the size of Earth is potentially larger than that of ureilite parent body (UPB; with diameter > 690 km), resulting in higher temperatures at the core-mantle boundary of Earth, it can be predicted that the terrestrial core formation may not directly cause Ni stable isotope fractionation. On the other hand, we also report high-precision Cr stable isotope composition of ureilites, including one ureilitic trachyandesite (ALM-A) that is enriched in lighter Cr stable isotopes relative to the main-group ureilites, which suggests the partial melting occurred on UPB. The globally heavy Cr in the UPB compared to chondrites can be caused by sulfur-rich core formation processes.</p>
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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)
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DANDI Archive for NWB datasets
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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.