Nitrobacteraceae

The Nitrobacteraceae are a family of gram-negative, aerobic bacteria. They include plant-associated bacteria such as Bradyrhizobium, a genus of rhizobia associated with some legumes. It also contains animal-associated bacteria such as Afipia felis, formerly thought to cause cat-scratch disease. Others are free-living, such as Rhodopseudomonas, a purple bacterium found in marine water and soils. The strain Rhodopseudomonas palustris DX-1 can generate an electric current with no hydrogen production, a trait being explored in the development of the microbial fuel cell.[2] The genus Afipia has also been found in the atmosphere, where it uses methylsulfonylmethane as a carbon source.[3]

Nitrobacteraceae
Scientific classification
Domain:	Bacteria
Phylum:	Pseudomonadota
Class:	Alphaproteobacteria
Order:	Hyphomicrobiales
Family:	Nitrobacteraceae corrig. Buchanan 1917 (Approved Lists 1980)
Genera[1]
Afipia Brenner et al. 1992 Blastobacter Zavarzin 1961 (Approved Lists 1980) Bradyrhizobium Jordan 1982 Nitrobacter Winogradsky 1892 (Approved Lists 1980) Pseudolabrys Kämpfer et al. 2006 Pseudorhodoplanes Tirandaz et al. 2015 Rhodoplanes Hiraishi and Ueda 1994 Rhodopseudomonas Czurda and Maresch 1937 (Approved Lists 1980) Tardiphaga De Meyer et al. 2012 Variibacter Kim et al. 2014
Synonyms
Nitrobacteriaceae Buchanan 1917 (Approved Lists 1980) Bradyrhizobiaceae Garrity et al. 2006

The bacteria of this family derive their energy from oxidizing ammonia to nitrite, or by oxidizing nitrite to nitrate. They are commonly found in freshwater and soil.