acinetobacter radioresistens acinetobacter radioresistens acinetobacter radioresistens is a species of radiation-resistant bacteria. it is gram-negative, oxidase-negative, not spore-forming, nonmotile, nonfermentative, aerobic, pleomorphic, and coccobacilli-shaped. the type strain of this species is strain fo-1 (= iam 13186). acinetobacter radioresistens scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: moraxellaceae genus: acinetobacter species: a. radioresistens binomial name acinetobacter radioresistensnishimura et al. 1988