nitrogenase


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nitrogenase

[nī′trä·jə‚nās]
(biochemistry)
An enzyme that catalyzes a six-electron reduction of N2 in the process of nitrogen fixation.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Highlighted in colors corresponding to those of Figure 1 are genes for CODH-ACS complex, nitrogenase, methanol, and ethanol utilization.
In general high application of N negatively affected the nitrogenase activity, diazotrophs colonization on rice roots, photosynthesis and plant growth.
Nitrogenase activity was determined using cells grown in semi-solid NFbHP medium containing glutamate (0.5 mM).
Biological [N.sub.2]-fixation in aquatic plants is a process in which dissolved [N.sub.2] gas is transformed to ammonium by the action of the enzyme nitrogenase. We know empirically that the isotopic fractionation associated with biological [N.sub.2]-fixation is very small ([alpha] = 1.000-1.002; [alpha] [equivalent to] [R.sub.reactant]/[R.sub.product]) (85-88)
(1999) observed a dramatic increase of nitrogenase activity after the sulphates had been removed from the growth medium.
Nitrogenase is a bacterial enzyme that is responsible for reduction of N2 to NH3 and can lead the reactions in normal pressure and temperature.
Nitrogenase. Nitrogen is one of the major constituents of biological systems.
However, the acetylene-reduction assay for bacterial nitrogenase activity estimates in-situ N-fixation rates as a measure of enzyme activity during the time and under the conditions of incubation.
Elevated UVB equivalent to 15% [O.sub.3] depletion decreases [N.sub.2] fixation in tropical leguminous crops due to reduced photosynthesis and nodulation including nitrogenase activity; nevertheless, the molecular basis of this phenomenon is not known yet [28].
They occur under the transformation of rhizobia in bacteroids followed by the nitrogenase induction and arising of metabolic functions required for nitrogen fixation in the plant host cells.