Molecular Nitrogen Fixation and Nitrogen Cycle in Nature
نویسندگان
چکیده
منابع مشابه
Molecular genetics of symbiotic nitrogen fixation.
Although most organisms, including all eucaryotes, cannot assimilate atmospheric dinitrogen (N2), a group of evolutionarily divergent procaryotes are able to reduce N2 directly to ammonia (nitrogen fixation) under a variety of physiological conditions. The molecular genetics of nitrogen fixation has been studied primarily in Klebsiella pneumoniae because of its close taxonomic relation to Esche...
متن کاملNitrogen Fixation
Plant growth is directly dependent upon an adequate supply of fixed nitrogen. Water and fixed nitrogen are the most common limiting factors for plant growth.There is an abundance of nitrogen in the atmosphere, but it is in the form of the relatively inert gas, N2, and this must be converted chemically or biologically into a more active form before plants can utilize it. Chemical fixation most c...
متن کاملNitrogen fixation and temperature
Physiological constraints on the global distribution of Trichodesmium – effect of temperature on diazotrophy E. Breitbarth, A. Oschlies, and J. LaRoche Leibniz-Institute of Marine Sciences, IFM-GEOMAR, Düsternbrooker Weg 20, 24105 Kiel, Germany National Oceanography Centre, Southampton, European Way, Southampton, SO14 3ZH, UK now at: Department of Chemistry, Analytical and Marine Chemistry, Göt...
متن کاملNitrogen fixation in ruminants.
The amount of nitrogen gas (N2) available for microbial protein synthesis via nitrogen fixation in the rumen was estimated. Measurements were made of nitrogen fixation by ruminal ingesta from goats fed low protein rations for a prolonged period of time, and by ingesta from sheep fed high protein rations. Nitrogen fixation by rumen microorganisms incubated for 30 or 180 min in vitro was measured...
متن کاملNitrogen and nature.
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? Processes that slow the cycling of N relative to other elements and processes that control ecosystem-level inputs a...
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ژورنال
عنوان ژورنال: Tellus
سال: 1952
ISSN: 0040-2826,2153-3490
DOI: 10.3402/tellusa.v4i4.8811