Of a plant, microbe, etc., able to convert inorganic nitrogen into a form usable in the biosphere.

(chemistry, biochemistry) 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

(chemistry) The rapid inversion of the lone pair in a molecule such as a tertiary amine which prevents it from being chiral.

(physics, astronomy) A group of nuclear reactions, that involve the interaction of protons with carbon, nitrogen and oxygen nuclei, thought to be the main source of energy in main-sequence stars of greater than 1.4 solar mass.

plural of nitrobacterium

(inorganic chemistry) dinitrogen pentoxide

(biochemistry) a plant or other organism which accomplishes nitrogen fixation

Nitric oxide.

(chemistry) Any oxide of nitrogen.

(chemistry) Synonym of dinitrogen tetroxide