nitrosomonas eutropha nitrosomonas eutropha nitrosomonas eutropha is an ammonia-oxidizing, gram-negative bacterium from the genus of nitrosomonas. nitrosomonas eutropha scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: nitrosomonadales family: nitrosomonadaceae genus: nitrosomonas species: n. eutropha binomial name nitrosomonas eutrophakoops et al. 2001 type strain nm 57 starting in 2014, it was being tested by the biotech company aobiome for its possible health benefits on skin. aobiome started a phase ii trial of an intranasal formulation of the bacteria for migraines.