Source:http://linkedlifedata.com/resource/umls/id/C1750467
GO: The oxidation of ammonium (NH4) to nitrogen (N2) in the absence of oxygen, using nitrite (NO2) as the electron acceptor. It is suggested that hydroxylamine and ammonium are combined to yield hydrazine, which is subsequently oxidized to N2. [MetaCyc:P303-PWY]