Results 221 to 230 of about 2,650,865 (282)
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SSSA Book Series, 2018
Most soils contain inorganic nitrogen (N) in the form of ammonium (NHt) and nitrate (NO)"). Nitrite (NOz) also may be present, but the amount is usually too small to warrant its determination, except in cases where NHt or NHt-forming fertilizers are ...
R. Mulvaney
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Most soils contain inorganic nitrogen (N) in the form of ammonium (NHt) and nitrate (NO)"). Nitrite (NOz) also may be present, but the amount is usually too small to warrant its determination, except in cases where NHt or NHt-forming fertilizers are ...
R. Mulvaney
semanticscholar +1 more source
Elastic Scattering of Nitrogen by Nitrogen
Physical Review, 1956The differential cross section for the elastic scattering of nitrogen from nitrogen was measured for incident nitrogen laboratory energies of 15.0, 17.7, 19.2, and 21.7 Mev and laboratory angles from 15\ifmmode^\circ\else\textdegree\fi{} to 55\ifmmode^\circ\else\textdegree\fi{}.
H. L. Reynolds, A. Zucker
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Nitrogen assimilation and nitrogen control in cyanobacteria
Biochemical Society Transactions, 2005Nitrogen sources commonly used by cyanobacteria include ammonium, nitrate, nitrite, urea and atmospheric N2, and some cyanobacteria can also assimilate arginine or glutamine. ABC (ATP-binding cassette)-type permeases are involved in the uptake of nitrate/nitrite, urea and most amino acids, whereas secondary transporters take up ammonium and, in some ...
Enrique Flores, Antonia Herrero
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2001
When leafy vegetables such as spinach and lettuce are grown in greenhouses during winter and early spring, i.e. at low light intensity and short day length, they may accumulate a high amount of nitrate in the leaves (Corre and Breimer 1979). A high nitrate content in vegetables is undesirable, because it may be harmful for the consumer.
ter Steege, M.W. +2 more
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When leafy vegetables such as spinach and lettuce are grown in greenhouses during winter and early spring, i.e. at low light intensity and short day length, they may accumulate a high amount of nitrate in the leaves (Corre and Breimer 1979). A high nitrate content in vegetables is undesirable, because it may be harmful for the consumer.
ter Steege, M.W. +2 more
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Nitrogen Fixation and Nitrogen Fertilization of Soybeans
Isotopes in Environmental and Health Studies, 1996Abstract In pot experiments with (15)N labelled soil and mineral (15)N, the influence of Bradyrhizobium (Rhizobium japonicum) inoculation and N fertilization on the symbiotic N(2) fixation and yield of soybeans [Glycine max (L.) Merill., cv. 'Fiskeby V'] was investigated.
H J Jacob, W Merbach
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Journal of Medicinal Chemistry, 2014
Nitrogen heterocycles are among the most significant structural components of pharmaceuticals. Analysis of our database of U.S. FDA approved drugs reveals that 59% of unique small-molecule drugs contain a nitrogen heterocycle. In this review we report on
Edon Vitaku +2 more
semanticscholar +1 more source
Nitrogen heterocycles are among the most significant structural components of pharmaceuticals. Analysis of our database of U.S. FDA approved drugs reveals that 59% of unique small-molecule drugs contain a nitrogen heterocycle. In this review we report on
Edon Vitaku +2 more
semanticscholar +1 more source
2007
Publisher Summary This chapter provides an overview of nitrogen transformations. No other element essential for life takes as many forms in soil as nitrogen (N), and transformations among these forms are mostly mediated by microbes. Soil microbiology plays yet another crucial role in ecosystem function: in most terrestrial ecosystems, nitrogen limits ...
P.M. Groffman, G.P. Robertson
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Publisher Summary This chapter provides an overview of nitrogen transformations. No other element essential for life takes as many forms in soil as nitrogen (N), and transformations among these forms are mostly mediated by microbes. Soil microbiology plays yet another crucial role in ecosystem function: in most terrestrial ecosystems, nitrogen limits ...
P.M. Groffman, G.P. Robertson
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Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur
, 2003Use of stable isotope ratios to trace pathways of organic matter among consumers requires knowledge of the isotopic shift between diet and consumer. Variation in trophic shift among consumers can be substantial. For data from the published literature and
J. H. McCutchan +3 more
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Herbivory in relation to plant nitrogen content
, 1980The nitrogen content of a plant is only one of the many plant characteristics that are vitally important to herbivores. However, because of its central role in all metabolic processes as well as in cellular structure and genetic coding, nitrogen is a ...
W. J. Mattson
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2010
Nitrogen constitutes approximately 78% of the earth’s atmosphere, but as a result of the strong triple bond in N2 molecules, the element is comparatively unreactive. One of the most important nitrogen compounds, ammonia, is produced by reaction of the elements under strenuous conditions. Moreover, there is an extensive chemistry in which liquid ammonia
James E. House, Kathleen A. House
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Nitrogen constitutes approximately 78% of the earth’s atmosphere, but as a result of the strong triple bond in N2 molecules, the element is comparatively unreactive. One of the most important nitrogen compounds, ammonia, is produced by reaction of the elements under strenuous conditions. Moreover, there is an extensive chemistry in which liquid ammonia
James E. House, Kathleen A. House
openaire +3 more sources