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65 results for “carbon stable isotopes”
Intra-annual-tree-ring-stable-carbon-and-oxygen-isotope-of-Chinese-pine-in-Helan-Mountains
<p>The data are intra-annual series of tree-ring stable carbon (δ<sup>13</sup>Ccor) and oxygen (δ<sup>18</sup>O) isotopes from Chinese pine (<em>Pinus tabuliformis</em>) in Helan Mountains</p>
Feather nitrogen and carbon stable isotope (d15N and d13C) values for Golden-crowned Sparrows
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Bulk tissue versus amino acid carbon stable isotopes to reveal the diet and basal resource use of an invasive rodent
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Data from: Arithmetic normalization models for the effects of lipid on carbon stable isotope values in silver carp (Hypophthalmichthys molitrix) tissue
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Stable carbon and nitrogen isotope analysis data for sequentially sampled whiskers of caracals (Caracal caracal) on the Cape Peninsula, South Africa
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Quality control for modern bone collagen stable carbon and nitrogen isotope measurements
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Data from: Metabolic proxy for cephalopods: Stable carbon isotope values recorded in different biogenic carbonates
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Calcium stable isotopes of Tonga and Mariana arc lavas and implications for slab fluid-mediated carbonate transfer in subduction zones
<p>The Table 1 shows Ca isotopes and selected major and trace element compositions of the Tonga rear arc and Mariana arc lavas.</p> <p>Supporting imformation includ Figure S1 and Table S1</p> <p>Figure S1 shows the δ<sup>44/42</sup>Ca‰ versus δ<sup>43/42</sup>Ca‰ in all samples and reference materials measured by Nu Plasma 1700 MC-ICP-MS in GPMR.</p> <p>Table S1 lists the major and trace element contents of NW Rota-1 and Esmeralda Bank samples from Mariana arc. Major elements are tested on board and trace elements are measured by ICP-MS in GPMR.</p>
Determining sugar and molasses origin by non-exchangeable hydrogen stable isotope of ethanol and carbon isotope ratio mass spectrometry
<p>This study explores the differentiation of sugar and molasses produced from sugar beet and cane, which are susceptible to fraudulent labeling due to differing production costs. The research aimed to authenticate these products by botanical origin using novel analytical techniques. Utilizing ethanol isotopic measurement–isotope ratio mass spectrometry (IRMS) for non-exchangeable hydrogen stable isotopes alongside carbon stable isotopes analysis through elemental analyzer–IRMS, the study accurately identified the origin of various sugar and molasses samples, pinpointed mislabeled goods, and determined the source of products with previously unknown provenance. These methods were also effective in revealing sugar and molasses adulteration and quantifying the extent of such fraud. The combined isotope analyses demonstrated their potential as robust tools for combating misrepresentation and adulteration in the sugar industry.</p>
The stable isotope data, and statistic of percentage of bioturbation and their halo from early Cambrian carbonate, North China
<p>The stable isotope data, and statistic of percentage of bioturbation and their halo from early Cambrian carbonate, North China</p>
Bulk stable carbon and nitrogen isotopes of food residues on pottery, stable carbon isotopes of lipids from pottery
<p>Supplementary data for Philippsen, B. (2023) Changing diet in a changing world. In: Groß, D. and Rothstein , M. (eds) Changing Identities in a Changing World.</p>
Tree-ring width, and tree-ring stable carbon isotope data from SW Alaska
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Data from: Metabolism and foraging strategies of mid-latitude mesozooplankton during cyanobacterial blooms as revealed by fatty acids, amino acids and their stable carbon isotopes
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Stable carbon, oxygen and nitrogen isotopes in tree rings from temperate forests within long-term monitoring network in the UK
<p>Supporting dataset for the paper "Climate and atmospheric deposition effects on forest water‑use efficiency and nitrogen availability across Britain" by Guerrieri et al. 2020 Scientific Reports DOI is 10.1038/s41598-020-67562-w (<a href="https://www.nature.com/articles/s41598-020-67562-w">https://www.nature.com/articles/s41598-020-67562-w</a>)</p> <p>The dataset includes carbon, oxygen and nitrogen stable isotope composition measured in tree rings for four species at twelve forests across climate and atmospheric deposition gradients in Britain. Data were used to i) investigate spatial and temporal (over 30‑years) changes in tree intrinsic water use efficiency (iWUE, i.e., the ratio between CO<sub>2</sub> assimilation - A, and stomatal conductance- g<sub>s</sub>); ii) assess the possible species-specific physiological mechanisms (changes in A and/or g<sub>s</sub>) evaluate whether sites receiving high Ndep experience increase in ecosystem N availability and N saturation (using tree-ring nitrogen isotope composition as a proxy); iv) elucidate drivers of spatial and temporal changes in the isotope-derived physiological and ecological processes (i.e., relative contribution of climate vs. changes in atmospheric CO<sub>2</sub> and nitrogen and sulfur deposition). </p> <p>The following files are available:</p> <ul> <li>CSV file including: a) Site names; b) Species; c) Latitude; d) Longitude; e) Investigated years (1980-2010); f) Measured isotope-related parameters and tree ring nitrogen %. Isotope-related parameters included in the dataset are: 1) delta13C, 2) carbon isotope discrimination (Delta13C), 3) intercellular CO2 concentration (ci) and the ratio of intercellular to atmospheric CO2 concentrations (ci/ca), delta18O, estimated delta18O in precipitation (delta18OP) according to Barbour et al. 2001 (see Method in Guerrieri et al. 2020 Scientific Reports), oxygen isotope discrimination above the source water (Delta18O), delta15N. </li> <li>PDF file reporting the equations used to calculate the isotope-derived parameters, which can also be found in the paper by Guerrieri et al. 2020 Scientific Reports (accepted)</li> </ul>
Periphyton carbon and nitrogen stable isotopes detect agricultural stressors in low-order streams
<p>Shifts in the stable isotope signatures of carbon (C) and nitrogen (N) in ecological materials have the potential to indicate environmental disturbances. This study examined the δ<sup>13</sup>C‰ and δ<sup>15</sup>N‰ ratios of stream water and periphyton from low-order streams in a landscape influenced by agricultural activities. Our key purpose was to assess the influence of best management practice (BMP) presence and age on C and N isotope values as a potential water-quality assessment. We collected stream water and periphyton from 19 streams within the Upper Delaware River watershed in New York, USA, in each of 4 management categories: 1) recently applied BMP treatments, 2) long-standing BMPs, 3) streams lacking BMPs, and 4) minimally disturbed reference streams. We sampled and analyzed water and periphyton for δ<sup>13</sup>C‰ and δ<sup>15</sup>N‰ in a repeated-measures design (BMP category ´ time) from April to November 2013. There were large seasonal differences in stream water δ<sup>13</sup>C-dissolved organic C (DIC)‰ and δ<sup>15</sup>NO<sub>3</sub>-N‰, with strong differences between reference and agricultural streams. Periphyton δ<sup>13</sup>C‰ and δ<sup>15</sup>N‰ values also differed strongly across streams draining land with agricultural activities, with 85% higher periphyton δ<sup>15</sup>N‰ signals in all agricultural categories vs reference streams. Periphyton diatom and chlorophyte taxonomic proportions showed the strongest relationship with periphyton δ<sup>13</sup>C‰ values, where diatoms were negatively associated with increasing δ<sup>13</sup>C‰. These results suggest that aqueous and periphytic stable isotopes were sensitive in detecting persistent effects of agriculture on these streams despite BMP mitigation, where nutrient (orthosphosphate, nitrite, and ammonia) levels were non-indicative. These results also suggest that BMPs may not have fully eliminated the negative impacts of agricultural stressors on water quality in impacted streams.</p>
Leaf, stem, and root stable carbon isotope ratios and gas exchange data for 452 plants
<p>This dataset contains a compilation of stable carbon isotope ratios in leaves, stems, and roots for tree saplings and associated gas exchange data. It was used in a book chapter to test whether the relationship between carbon isotope discrimination and the ratio of intercellular to ambient carbon dioxide concentrations differs between leaves and woody tissues. The book chapter is entitled 'Carbon isotope effects in relation to CO<sub>2</sub> assimilation by tree canopies' authored by Lucas A. Cernusak and Nerea Ubierna. It is part of the book entitled 'Stable Isotopes in Tree Rings' edited by Rolf T. Siegwolf, J. Renee Brooks, John Roden, and Matthias Saurer. The publisher of the book is Springer International Publishing, with publication in April 2022.</p>
Data from: Starvation effects on nitrogen and carbon stable isotopes of animals: an insight from meta-analysis of fasting experiments
Nitrogen and carbon stable isotopic compositions (δ15N and δ13C) of consumers have been used for physiological and food web studies. Previous studies have shown δ15N and δ13C values are affected by several biological and environmental factors during starvation, but the generality of the effect of starvation on δ15N and δ13C values has not yet been tested. Here, we performed a meta-analysis to evaluate the effects of starvation on δ15N and δ13C values of consumers, and the underlying factors that may explain the observed variation. The δ15N and δ13C values were calculated as the differences between the final δ15N and δ13C values of consumers (post-starvation) and the pre-starvation values on each experiment. Our meta-analysis showed a large variation in the δ15N and δ13C values of consumers (δ15N range: –0.82 to 4.30‰; mean: 0.47‰ and δ13C range: –1.92 to 2.62‰; mean: 0.01‰). The δ15N values of most consumers increased along the length of the starvation period and were influenced by nitrogen excretion and thermoregulation types, probably because differences in nitrogen metabolism and thermoregulation affect nitrogen processing and excretion rates. None of our predictor variables accounted for the variation in δ13C values, which showed both increases and decreases due to fasting. Our findings suggest that starvation results in changes in consumer δ15N values which are mainly explained by the length of the fasting period and by nitrogen and energy metabolism, but the underlying mechanisms of the starvation effects on δ13C values seem to be more complex than previously thought.
Microplasma emission spectroscopy of stable isotope ratios in carbon dioxide
<p>Work material related to the published article.</p>
Periphyton carbon and nitrogen stable isotopes detect agricultural stressors in low-order streams
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Leaf, stem, and root stable carbon isotope ratios and gas exchange data for 452 plants
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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)
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.