nitrogen fixation
noun Date: 1895 the metabolic assimilation of atmospheric nitrogen into ammonia by soil microorganisms and especially rhizobia

New Collegiate Dictionary. 2001.

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  • Nitrogen fixation — is the natural process, either biological or abiotic, by which nitrogen (N2) in the atmosphere is converted into ammonia (NH3).[1] This process is essential for life because fixed nitrogen is required to biosynthesize the basic building blocks of …   Wikipedia

  • nitrogen fixation — n 1) the industrial conversion of free nitrogen into combined forms useful esp. as starting materials for fertilizers or explosives 2) the metabolic assimilation of atmospheric nitrogen by soil microorganisms and esp. rhizobia and its release for …   Medical dictionary

  • nitrogen fixation — n. 1. the conversion of atmospheric nitrogen into nitrogenous compounds by bacteria (nitrogen fixers) found in the root nodules of legumes and certain other plants, and in the soil 2. the conversion of free nitrogen into nitrogenous compounds of… …   English World dictionary

  • nitrogen fixation — 1. any process of combining atmospheric nitrogen with other elements, either by chemical means or by bacterial action: used chiefly in the preparation of fertilizers, industrial products, etc. 2. this process as performed by certain bacteria… …   Universalium

  • nitrogen fixation — azoto fiksacija statusas T sritis chemija apibrėžtis Fermentų katalizuojamo atmosferos azoto virtimas amoniaku. atitikmenys: angl. nitrogen fixation rus. фиксация азота …   Chemijos terminų aiškinamasis žodynas

  • nitrogen fixation — azoto fiksacija statusas T sritis ekologija ir aplinkotyra apibrėžtis Fermentų katalizuojamo atmosferos azoto virtimas amoniaku. Dirvožemyje azotą fiksuoja laisvai gyvenančios ir gumbelinės bakterijos, sudarančios simbiozę su pupiniais augalais,… …   Ekologijos terminų aiškinamasis žodynas

  • nitrogen fixation — The incorporation of atmospheric nitrogen into ammonia by various bacteria, catalysed by nitrogenase. This is an essential stage in the nitrogen cycle and is the ultimate source of all nitrogen in living organisms. In the sea, the main nitrogen… …   Dictionary of molecular biology

  • nitrogen fixation —   a process carried out by certain algae and soil bacteria whereby atmospheric nitrogen is incorporated to form nitrogen based organic compounds. A crucial part of the nitrogen cycle …   Geography glossary

  • nitrogen fixation — /naɪtrədʒən fɪkˈseɪʃən/ (say nuytruhjuhn fik sayshuhn) noun 1. any process of combining free nitrogen from the air with other elements, either by chemical means or by bacterial action, used especially in the preparation of fertilisers, industrial …   Australian English dictionary

  • nitrogen fixation — The metabolic process in which atmospheric molecular nitrogen is reduced to ammonia; carried out by cyanobacteria, Rhizobium, and other nitrogen fixing bacteria …   Dictionary of microbiology

  • nitrogen fixation — noun the conversion of atmospheric nitrogen into ammonia and organic derivatives, by natural means, especially such conversion, by microorganisms in the soil, into a form that can be assimilated by plants See Also: nitrogen fixing …   Wiktionary

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