Results 331 to 340 of about 4,709,326 (400)
Chemical Reviews, 2020 Nitrogen is ubiquitous in both natural and laboratory-grown diamond, but the number and nature of the nitrogen-containing defects can have a profound effect on the diamond material and its properties. An ever-growing fraction of the supply of diamond appearing on the world market is now lab-grown.
Michael N R Ashfold +2 more
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The microbial nitrogen-cycling network
Nature Reviews Microbiology, 2018Marcel M M Kuypers +2 more
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NONPOINT POLLUTION OF SURFACE WATERS WITH PHOSPHORUS AND NITROGEN
, 1998Agriculture and urban activities are major sources of phosphorus and nitrogen to aquatic ecosystems. Atmospheric deposition further contributes as a source of N. These nonpoint inputs of nutrients are difficult to measure and regulate because they derive
S. Carpenter +5 more
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, 1951
This paper will show that the assumption of a simple Gaussian or Maxwellian distribution of pore sizes is inadequate for many adsorbents. It will also show that Oulton’s assumption of constant thickness for the physically adsorbed layer, while adequate ...
E. Barrett +2 more
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This paper will show that the assumption of a simple Gaussian or Maxwellian distribution of pore sizes is inadequate for many adsorbents. It will also show that Oulton’s assumption of constant thickness for the physically adsorbed layer, while adequate ...
E. Barrett +2 more
semanticscholar +1 more source
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
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AMBIO: A Journal of the Human Environment, 2002 Anthropogenic changes to the global N cycle are important in part because added N alters the composition, productivity, and other properties of many natural ecosystems substantially. Why does added N have such a large impact? Why is N in short supply in so many natural ecosystems?
Stephan Hättenschwiler +3 more
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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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Managing nitrogen to restore water quality in China
Nature, 2019 Chaoqing Yu +2 more
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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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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
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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