nitrobacter winogradskyi nitrobacter winogradskyi nitrobacter winogradskyi is a gram-negative nitrite-oxidizing bacteria from the genus of nitrobacter. nitrobacter winogradskyi scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: nitrobacteraceae genus: nitrobacter species: n. winogradskyi binomial name nitrobacter winogradskyiwinslow et al. 1917 synonyms bacillus nirobakter, bacterium nitrobacter, nitrobacter winogradskii