Results 11 to 20 of about 149,407 (284)
Ecotoxicology and Environmental Safety, 2021 Stable isotope labeling of pollutants is a valuable tool to investigate their environmental transport and degradation. For the globally most frequently used herbicide glyphosate, such studies have, so far, been hampered by the absence of an analytical ...
Marisa A. Wirth +5 more
doaj +1 more source
15N NMR study of a mixture of uniformly labeled tRNAs [PDF]
, 1982 15N NMR spectra were taken of 15N-enriched tRNA extracted from bakers yeast; ammonium sulfate was used as a nitrogen source. The increase in the degree of denaturation of tRNA, which occurs with increase in temperature from 30 degrees C to 70 degrees C ...
Birdseye, Theresa R. +3 more
core +1 more source
15N-labed glycine synthesis [PDF]
Anais da Academia Brasileira de Ciências, 2006 This work describes a method for 15N-isotope-labeled glycine synthesis, as well as details about a recovery line for nitrogen residues. To that effect, amination of alpha-haloacids was performed, using carboxylic chloroacetic acid and labeled aqueous ammonia (15NH3).
Tavares, Claudinéia R.O. +4 more
openaire +5 more sources
Journal of Forest Science, 2008 We analysed stable isotopes of N in a spruce forest under ambient rainfall (no further manipulation of the atmospheric input) and clean rain application (10 years of reduced inorganic N- and acid-constituent input).
S. P. Sah, R. Brumme, N. Lamersdorf
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Plant, Soil and Environment, 2005 This study aims to investigate the changes in isotope ratios in foliage and soils of the two spruce forests [Picea abies (L.) Karst.] differing greatly in their atmospheric N deposition and climatic conditions.
S.P. Sah
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Stabilization and plant uptake of N from 15N-labelled pea residue 16.5 years after incorporation in soil [PDF]
, 2006 The decline of N from 15N-labelled mature pea residues was followed in unplanted soil over 16.5 yr. Eight years after residue incorporation, 24% of the residue 15N input was still present in the soil and, after 16.5 yr, 16% of the residue 15N input ...
Erik Steen Jensen +11 more
core +1 more source
First measurements of 15N fractionation in N2H+ toward high-mass star forming cores [PDF]
, 2015 We report on the first measurements of the isotopic ratio 14N/15N in N2H+ toward a statistically significant sample of high-mass star forming cores. The sources belong to the three main evolutionary categories of the high-mass star formation process ...
Bizzocchi, L. +4 more
core +2 more sources
Isotopic Anomalies in Primitive Solar System Matter: Spin-state Dependent Fractionation of Nitrogen and Deuterium in Interstellar Clouds [PDF]
, 2012 Organic material found in meteorites and interplanetary dust particles is enriched in D and 15N. This is consistent with the idea that the functional groups carrying these isotopic anomalies, nitriles and amines, were formed by ion-molecule chemistry in ...
Charnley, S. B. +3 more
core +3 more sources
Natural 15N abundance in two nitrogen saturated forest ecosystems at Solling, Germany
Journal of Forest Science, 2003 This research deals with a comparative study of two different N-saturated forests: 1. beech forest and 2. spruce forest at the same locality of \solling, Central Germany.
S.P. Sah, R. Brumme
doaj +1 more source
Global Ecology and Conservation, 2022 In N-limited temperate regions of China, rates of atmospheric N deposition remain high during winter due to industrial development and energy consumption. Winter-deposited N accumulates and is then released after snowmelt.
Linna Ma +3 more
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