An Alternative Path for the Evolution of Biological Nitrogen Fixation
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چکیده
منابع مشابه
An Alternative Path for the Evolution of Biological Nitrogen Fixation
Nitrogenase catalyzed nitrogen fixation is the process by which life converts dinitrogen gas into fixed nitrogen in the form of bioavailable ammonia. The most common form of nitrogenase today requires a complex metal cluster containing molybdenum (Mo), although alternative forms exist which contain vanadium (V) or only iron (Fe). It has been suggested that Mo-independent forms of nitrogenase (V...
متن کاملMechanism of Biological Nitrogen Fixation
Recently Phelps and Wilson (1) reported the occurrence of hydrogenase, the enzyme which activates molecular hydrogen, in nitrogen-fixing bacteria. Because HZ specifically inhibits nitrogen fixation by red clover plants inoculated with Rhizobium trijolii as well as by Azotobacter (2,3), possession of hydrogenase by these organisms may be more than merely fortuitous. The possibility must be consi...
متن کاملEvidence for an alternative nitrogen fixation system in Azotobacter vinelandii.
Two Azotobacter vinelandii strains capable of growing on N2(Nif+) were isolated from two different mutant strains that lacked dinitrogenase activity (Nif-). Extracts of N2-grown cells of the two Nif+ strains lacked significant amounts of the "conventional" dinitrogenase protein subunits, as determined by two-dimensional gel electrophoresis. Instead, the extracts contained at least four new prot...
متن کاملThe Thermochemistry of Biological Nitrogen Fixation
Using standard thermodynamic data it is shown that the oxidation of glucose by nitrogen to give carbon dioxide and ammonia is an overall reaction that involves a substantial evolution of heat and decrease in free energy. This is not in accordance with literature statements that biological nitrogen fixation is endothermic. In the concluding section a Frost diagram is used to survey the thermodyn...
متن کاملBiological nitrogen fixation, 1924-1974.
Crop rotation was practiced in ancient times by alternating the use of leguminous and nonleguminous plants. The basis for the benefit derived from this practice was not understood, but it was observed empirically that crops were improved and the condition of the soil was maintained better with rotation than by continual cropping with nonleguminous plants. Rotation was recognized as good husband...
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ژورنال
عنوان ژورنال: Frontiers in Microbiology
سال: 2011
ISSN: 1664-302X
DOI: 10.3389/fmicb.2011.00205