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76 results for “15N”
Leaf 15N isotope, total N and delta 15N from 9 species water treatment plots:e141: BioCON : Biodiversity, Elevated CO2, and N Enrichment
BioCON (Biodiversity, CO2, and Nitrogen) is an ecological experiment started in 1997 at the University of Minnesota's Cedar Creek Ecosystem Science Reserve. BioCON's goal is to explore the ways in which plant communities will respond to three environmental changes that are known to be occurring on a global scale: increasing nitrogen deposition, increasing atmospheric CO2, and decreasing biodiversity. Why Biodiversity, CO2, and Nitrogen? While there are many uncertainties in global change biology, there are also some well documented facts. Some of these are: 1. The amount of carbon dioxide (CO2) in the atmosphere is rising. Since the industrial revolution, the CO2 concentration in the atmosphere has increased from approximately 275 parts per million (ppm) to about 378 ppm today. This has been largely the result of fossil fuel burning. It is expected that CO2 levels will continue to rise, and that by the year 2050 these levels will be approximately 550 ppm. CO2 is the raw material for photosynthesis and is known to affect plant growth and development. 2. The amount of nitrogen moving through terrestrial ecosystems has increased in the recent past. While natural "background" levels of nitrogen fixation have remained constant, human additions to the system through fertilizer production and fossil fuel use have increased dramatically. Nitrogen is a key nutrient for plant growth and plays a critical role in plant community structure and composition in many environments. 3. Biodiversity levels are falling. While the research and data are not as complete as they are for CO2 and nitrogen, data indicate that the number of species globally, is being reduced. Perhaps more important for ecosystem function, diversity levels on local to regional scales have fallen due to land use change, biotic invasion and many other drivers. While much is known about how each of these factors affects ecosystem functioning, many questions remain. There is also little data on how these issues affe
Nitrate (15N) Uptake near Palmer Station, 2012-2013
Nitrate uptake by the bulk phytoplankton community was determined using tracer (<10%) additions of labeled 15-NO3. Samples were collected by Go-Flo from 5 depths 0, 5, 10, 20, 65 m and incubated for 24 h at light levels of 100%, 50%, 25%, 10%, and 0% surface irradiance, respectively.
Data from: Urine is an important nitrogen source for plants irrespective of vegetation composition in an Arctic tundra: insights from a 15N-enriched urea tracer experiment
1. Mammalian herbivores can strongly influence nitrogen (N) cycling and herbivore urine could be a central component of the N cycle in grazed ecosystems. Despite its potential role for ecosystem productivity and functioning, the fate of N derived from urine has rarely been investigated in grazed ecosystems. 2. This study explored the fate of <sup>15</sup>N-enriched urea in tundra sites that have been either lightly or intensively grazed by reindeer for more than 50 years. We followed the fate of the <sup>15</sup>N applied to the plant canopy, at 2 weeks and 1 year after tracer addition, in the different ecosystem N pools. 3. <sup>15</sup>N-urea was rapidly incorporated in cryptogams and in aboveground parts of vascular plants, while the soil microbial pool and plant roots sequestered only a marginal proportion. Further, the litter layer constituted a large sink for the <sup>15</sup>N-urea, at least in the short term, indicating a high biological activity in the litter layer and high immobilization in the first phases of organic matter decomposition. 4. Mosses and lichens still constituted the largest sink for the <sup>15</sup>N-urea 1 year after tracer addition at both levels of grazing intensity demonstrating their large ability to capture and retain N from urine. Despite large fundamental differences in their traits, deciduous and evergreen shrubs were just as efficient as graminoids in taking up the <sup>15</sup>N-urea. The total recovery of <sup>15</sup>N-urea was lower in the intensively grazed sites, suggesting that reindeer reduce ecosystem N retention. 5. <i>Synthesis</i> The rapid incorporation of the applied <sup>15</sup>N-urea indicates that arctic plants can take advantage of a pulse of incoming N from urine. In addition, δ <sup>15</sup>N values of all taxa in the heavily grazed sites converged towards the δ <sup>15</sup>N values for urine, bringing further evidence that urine is an important N source for plants in grazed tundra ecosystems.
15N-HSQC spectra of tagged Ubiquitin S57C
<p>15N-HSQC spectra of Ubiquitin S57C tagged with different lanthanide tags (C1, C2, C12 and C13)</p>
FIGURES 1–2 in 1H, 13C and 15N resonance assignments of telomeric repeat-binding domain ofArabidopsis thaliana
FIGURES 1–2. Nilotanypus dubius (Meigen), male. 1. Wing. 2. Hypopygium, ventral and dorsal view.
FIGURES 7–8 in 1H, 13C and 15N resonance assignments of telomeric repeat-binding domain ofArabidopsis thaliana
FIGURES 7–8. Nilotanypus quadratus sp. n., male. 7. Wing. 8. Hypopygium, ventral and dorsal view.
Data from: Urine is an important nitrogen source for plants irrespective of vegetation composition in an Arctic tundra: insights from a 15N-enriched urea tracer experiment
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Magnetic Resonance (MR) Imaging With Hyperpolarized 13C-Pyruvate +/- 13C,15N-Urea in Patients With Prostate Cancer
ClinicalTrials.gov study NCT06391034. IPD Sharing: NO. Countries: 1. Publications: 0.
Cloud-Precipitation Hybrid Regimes (MODIS-IMERG) in 15S-15N
Cloud-Precipitation Hybrid Regimes with MODIS C6.1 2D joint histogram of CTP and COT (total 42 bins) and IMERG v06B precipitation histogram (total 6 bins) derived in 15S-15N domain. There are 4 kinds of regime sets: 1) Cloud only (42bin), 2) Cloud+Precipitation with weight 1 (Cld42+Pr6x1), 3) Cloud+Precipitation with weight 3 (Cld42+Pr6x3), 4) Cloud+Precipitation with weight 7 (Cld42+Pr6x7; equal weight). File list: - MODIS_t+a_cld_hist_15S-15N_CR_set.Cld42.nc - MODIS_t+a_cld+pr6x1_hist_15S-15N_CPR_set.Cld42+Pr6x1.nc - MODIS_t+a_cld+pr6x3_hist_15S-15N_CPR_set.Cld42+Pr6x3.nc - MODIS_t+a_cld+pr6x7_hist_15S-15N_CPR_set.Cld42+Pr6x7.nc - MODIS_t+a_cld+pr6x7_hist_15S-15N_CPR_projected2IMERGdomain.Cld42+Pr6x7.nc
Hyperpolarized [15N]nitrate as a potential long lived hyperpolarized contrast agent for MRI
<p>Primary data for DOI: <a href="https://doi.org/10.1016/j.jmr.2019.01.001">10.1016/j.jmr.2019.01.001</a></p> <p>Title: Hyperpolarized [<sup>15</sup>N]nitrate as a potential long lived hyperpolarized contrast agent for MRI</p> <p>Authors: Ayelet Gamliel, Sivaranjan Uppala, Gal Sapir, Talia Harris, Atara Nardi-Schreiber, David Shaul, Jacob Sosna, J. Moshe Gomori, Rachel Katz-Brull</p> <p>Description:</p> <p>The primary datasets in this archive contain data presented in the above publication and consist of <sup>15</sup>N-NMR spectra in solutions.</p> <p>Please consult the Archive Guide.</p>
doi_________::0a5f959a68fb3449eea64ce0057b900e
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doi_________::5a712892efe00eb3c364c1229be5355e
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doi_________::901c6aae4906f4c431905c4f1bb949b7
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doi_________::a19c60b7dbdef0fe52dd7f998eec0f51
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doi_________::c4b8b6305847a3911b03d8091938f935
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doi_________::d8f964e76963f48033036bf4d044e51e
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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.