free nitrogen

См. также в других словарях:

• 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 group element — ▪ chemical elements Introduction  any of the chemical elements that constitute Group Va of the periodic table (see Figure >). The group consists of nitrogen (N), phosphorus (P), arsenic (As), antimony (Sb), and bismuth (Bi). The elements share… …   Universalium

• Nitrogen — carbon ← nitrogen → oxygen ↑ N ↓ P …   Wikipedia

• 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 cycle — the continuous sequence of events by which atmospheric nitrogen and nitrogenous compounds in the soil are converted, as by nitrification and nitrogen fixation, into substances that can be utilized by green plants, the substances returning to the… …   Universalium

• nitrogen — /nuy treuh jeuhn/, n. Chem. a colorless, odorless, gaseous element that constitutes about four fifths of the volume of the atmosphere and is present in combined form in animal and vegetable tissues, esp. in proteins: used chiefly in the… …   Universalium

• nitrogen-fixing bacteria — ▪ biology and ecology       microorganisms capable of transforming atmospheric nitrogen into fixed nitrogen, inorganic compounds usable by plants. More than 90 percent of all nitrogen fixation is effected by them.       Two kinds of nitrogen… …   Universalium

• 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 …  

• Nitrogen dioxide — Nitrogen dioxide …   Wikipedia

• 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