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Showing 1 to 20 of 250 for “"15N"”.
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Fertilizer 15N uptake efficiency in Midwestern corn production
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
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Organocatalytic synthesis of chiral non-racemic aziridines, labelled with 2H, 15N, 13C stable isotopes
… labelled with stable isotopes: 2H, 13C and 15N. The reactions were catalysed by (S)-BINOL derived N-triflylphosphoramide Brønsted acid and stable isotopes were selectively introduced within an aziridine ring with > 95% isotopic enrichment. The desired compounds were generated in yields of up …
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Sensitivity and resolution in 19F and 15N solid-state NMR: applications to pharmaceutical systems
… to detect and possibly quantify the ratio of 15N present for multiple 15N containing systems. The work highlights how for CP performed at fast MAS, there is a much greater sensitivity to the RF inhomogeneity of the probe, and how this be reduced by using ramped CP. The results showed that for …
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Use of 15N-labeled anhydrous NH3 to determine the efficiency of fall N fertilization for corn production
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2021-05-01
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An 15N study of the effects of nitrate, ammonium, and nitrate + ammonium nutrition on nitrogen assimilation in Zea Mays L.
… with a nutrient solution containing nitrogen as 15N.
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Nitrogen release, tree uptake, and ecosystem retention in a mid-rotation loblolly pine plantation following fertilization with 15N-enriched enhanced efficiency fertilizers
Nitrogen is the most frequently limiting nutrient in southern pine plantations. Previous studies found that only 10 to 25% of applied urea fertilizer N is taken up by trees. Enhanced efficiency fertilizers could increase tree uptake efficiency by controlling the release of N and/or stabilize N. …
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Messung von Wirkungsquerschnitten für die Streuung von Neutronen im Energiebereich von 2 MeV bis 4 MeV mit der 15N(p,n)-Reaktion als Neutronenquelle
… neutronenerzeugenden Reaktion. Hierfür wurde die 15N(p,n)15O-Reaktion ausgewählt, da sie die Erzeugung monoenergetischer Neutronen bis zu einer Energie von 5,7 MeV erlaubt. In dieser Arbeit wird die 15N(p,n)-Reaktion auf ihre Eignung als Quelle monoenergetischer Neutronen in Streuexperimenten …
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A 14C and 15N study of the effects of ammonium or nitrate nutrition on carbon allocation in Triticum aestivum L. and Zea mays L
The poor response of some plant species, e.g. wheat, to ammonium nutrition has been attributed to a diversion of carbon allocation from structural material for root extension to functions associated with the assimilation and translocation of ammonium in the root. The aim of this research was to …
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ΜΕΤΑΒΟΛΙΣΜΟΣ ΤΟΥ ΑΖΩΤΟΥ ΤΗΣ ΛΕΥΚΙΝΗΣ ΣΤΟ ΦΛΟΙΟ ΕΓΚΕΦΑΛΟΥ ΕΠΙΜΥΟΣ. ΠΕΙΡΑΜΑΤΑ ΜΕ 15Ν
… CONCENTRATIONS OF VALINE-ISOLEUCINE AND 15N-LEUCINE. DISTRIBUTION OF 15N AMONG THEFREE AMINO-ACIDS WAS MEASURED BY COMBINED GC-MS ANALYSIS. THE ANALYSIS SHOWED INCORPORATION OF 15N DERIVED FORM 15N-LEU, PRIMARILY TO ILE. A METABOLIC COMPARTMENTALIZATION OF THE THREE BCAA, IN RAT BRAIN …
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Development of a Software Package for the Quantitative Analysis of Proteomic Mass Spectrometry Datasets Labelled with Nitrogen-15
Elemental metabolic labelling using 15N stable isotopes is a technique used in peptide-centric proteomics that allows samples to be mixed before preparation and analysis (minimising technical variance) without introducing sample ambiguity to the results. Labelling with 15N induces a mass shift in …
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Hyperspectral Reflectance and Stable Isotopic Nitrogen: Tools to Assess Forest Ecosystem Nitrogen Cycling
… remote sensing, N stable isotope ratios ("15N) and growth response to nitrogenous fertilizer. In both species multiple linear regression models relating leaf-level reflectance to "15N showed strong predictive capabilities, with some models explaining more than 65% of the variance in "15N. …
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Biomolecular Solid-State Nuclear Magnetic Resonance Methods for Spectral Assignment and High-Resolution Structure Determination of Proteins
… G (GB1) as a model protein. Complete 13C and 15N chemical shifts are presented based on 2D 13C-13C, 15N-13C and 3D 15N-13C- 13C and 13C-15N-13C correlation spectra. Aromatic signal assignments are performed with customized experiments and processing schemes. Dynamics are analyzed …
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Stable carbon and nitrogen isotope ratios in the shallow-water cape hake, merluccius capensis (castelnau) as indicators of trophic position and diet on the west and south coasts of South Africa
13C/12C and 15N/14N were used to indicate the trophic levels of the shallow-water Cape hake, Merluccius capensis (Castelnau) at three sites on the west coast of South Africa, and five sites on the south coast. Gut content analyses show only the very recent diet of hake, therefore stable carbon and …
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Belowground Contributions of Pea and Canola to Soil Nitrogen Pools and Processes
… influence on soil nutrient cycling. Utilizing 15N-labeling methodologies under controlled conditions, the goal of this research was to quantify the input of belowground N (BGN), including rhizodeposits and roots, to soil and to investigate the influence of BGN on soil N cycling processes from …
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Nitrogen isotope variation in the environment: Implications for interpretation
Natural abundance of 15N varies greatly and unpredictably within and between environments. The unpredictable nature of 15N limits the use of N isotope natural abundance (d15N) in tracing the flow and fate of N in environments. Recent investigations have, however, revealed consistent and repeatable …
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The pathway of nitrogen assimilation in Datura stramonium L
… feeding levels has been investigated using 15N tracer experimentation, enzyme inhibitor studies and enzymological assays. Leaves were fed via their xylem stream with potassium nitrate at -1 -1 two concentration levels: 200 pg. N. ml and 25 JJ8 N. ml , prior to experimentation. Nitrate-15N …
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Development and Application of 19F NMR of Proteins
… assignment protocols were developed using 13C, 15N-enriched 3-fluorotyrosine and 3-fluorophenylalanine, separately biosynthetically incorporated into calmodulin. In the first approach, isotopic enrichment facilitated two-dimensional heteronuclear experiments based on INEPT and COSY magnetization …
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Bioarchaeological assessment of diet and changes in femoral and humeral stable isotopic values among subadults at Medieval Alytus, Lithuania.
… 2 years of age when enriched ?13C (-19.6‰) and ?15N values (12.7‰) begin to deplete suggesting introduction of C3 grain gruels and potential weaning-associated infirmity. Nitrogen values remained slightly elevated in children (3-5 years, 11.2‰) until the beginning of juvenility (5-8 years, 10.3‰) …
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