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Symbiotic Nitrogen Fixation However, they cannot fix atmospheric nitrogen until they have invaded the roots of the appropriate legume. Although some soil bacteria (e.g., Azotobacter) can fix nitrogen by themselves, rhizobia cannot. Clearly rhizobia and legumes are mutually dependent.
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Atmospheric Fixation All life requires nitrogen-compounds, e.g., proteins and nucleic acids. Plants must secure their nitrogen in "fixed" form, i.e., incorporated in compounds such as:
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Nitrogen fixation is the process by which atmospheric nitrogen gas is converted into ammonia. The ammonia is subsequently available for many important biological molecules such as amino acids, proteins, vitamins, and nucleic acids. The reaction can be presented as follows: This page is maintained by David Dalton,
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Nitrogen fixation - Wikipedia, the free encyclopedia
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It is available to some species of microorganism through Biological Nitrogen Fixation (BNF) in which atmospheric nitrogen is converted to ammonia by the enzyme nitrogenase. Microorganisms that fix nitrogen are called diazotrophs. Nitrogen fixation occurs both biologically and non-biologically.
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Nitrogen fixation is limited to prokaryotes. Some eubacteria and a few archebacteria can fix nitrogen - but no eukaryotic cells can do this. Some N-fixing bacteria are free-living whereas other form symbiotic associations with plants. Regulation of Nitrogen Fixation Alternative Nitrogen Fixation Systems...
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Nitrogen fixation is one process by which molecular nitrogen is reduced to form ammonia. This complex process is carried out by nitrogen-fixing bacteria present in the soil. Although nitrogen-fixation involves a number of oxidation-reduction reactions that occur sequentially, that reaction which describes its reduction can...
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Biological nitrogen fixation is the problem of the highest priority in biological and agricultural sciences, and in attempts to develop sustainable agricultural production. Development of this trend is a response to ecological and energy problems which agriculture has recently encountered.
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Although the earth's atmosphere is 78% nitrogen, After a harvest legume roots left in the soil decay, returning organic nitrogen compounds to the soil for uptake by the next generation of plants. Related content from HighBeam Research on: nitrogen cycle: Nitrogen Fixation...
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Nitrogen fixation is the process by which nitrogen is taken from its natural, relatively inert molecular form (N2) in the atmosphere and converted into nitrogen compounds (such as ammonia, nitrate and nitrogen dioxide).
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