eutropha C71 is now Nitrosomonas
Nitrosomonas eutropha C91 ( eu -, good; trophos , one who feeds) (also known as strain Nm57; formerly ATCC 25984, which is no longer available) is a Gram-negative betaproteobacterium closely related to the better studied Nitrosomonas europaea (Chain, 2001-2009). N.eutropha is an aerobic chemolithoautotroph deriving its carbon from CO2 and generating energy and reducing equivalents from the oxidation of ammonia to nitrite. It is pleomorphic (rod to pear-shaped) and is occasionally found in short chains (Koops, 1991). N. eutropha is commonly found in strongly eutrophic environments such as municipal and industrial sewage disposal systems and has a high tolerance for elevated ammonia concentrations. The cells are motile. The utilization of urea was not observed. Although N. eutropha is very similar to N. europaea, some notable differences exist. N. eutropha is able to grow anaerobically with H2 as the reductant and nitrite as the electron acceptor. However, the genomic sequence of N. europaea fails to give any indication supporting the presence of this ability. Additionally, unlike N. europaea , N. eutropha possesses carboxysomes. These differences suggest that significant differences in metabolic capability may exist between these related strains.
Chain, P., J. Lamerdin, F. Larimer, W. Regala, V. Lao, M. Land, L. Hauser, A. Hooper, M. Klotz, J. Norton, L. Sayavedra-Soto, D. Arciero, N. Hommes, M. Whittaker, D. Arp. 2003. Complete genome sequence of the ammonia oxidizing bacterium and obligate chemolithoautotroph Nitrosomonas europaea . J. Bacteriol. 185: 2759-2773.
Koops H-P, Böttcher B, Möller U, Pommerening-Röser A, Stehr G. Classification of eight new species of ammonia-oxidizing bacteria: Nitrosomonas communis sp. nov., Nitrosomonas ureae sp. nov., Nitrosomonas aestuarii sp. nov., Nitrosomonas marina sp. nov., Nitrosomonas nitrosa sp. nov., Nitrosomonas eutropha sp. nov., Nitrosomonas oligotropha sp. nov. J Gen Microbiol. 1991; 13 :1689-1699.