Nitrogen fixation Essay -- essays research papers

The growth of all(a) organisms depends on the availability of mineral nutrients, and none is more important than nitrogen, which is required in large amounts as an essential component of proteins, nucleic acids and other cellular constituents. There is an abundant yield of nitrogen in the farmings atmosphere - nearly 79% in the do of N2 gas. However, N2 is unavailable for use by most organisms because there is a triplet bond between the two nitrogen atoms, making the molecule well-nigh inert. In order for nitrogen to be used for growth it must(prenominal) be " unconquerable" (combined) in the form of ammonium (NH4) or serve well (NO3) ions. The weathering of rocks releases these ions so slowly that it has a neglible effect on the availability of fixed nitrogen. So, nitrogen is often the limiting factor for growth and biomass production in all environments where there is suitable climate and availability of water to meet life.Microorganisms have a central role in almo st all aspects of nitrogen availability and thus for life support on earth     some bacteria can convert N2 into ammonia by the process termed nitrogen fixation these bacteria are either free-living or form symbiotic associations with plants or other organisms (e.g. termites, protozoa)      other bacteria cultivate about transformations of ammonia to nitrate, and of nitrate to N2 or other nitrogen gases       some bacteria and fungi degrade organic matte...