pseudomonas acidophila pseudomonas acidophila pseudomonas acidophila is a gram-negative soil bacterium that produces the beta-lactam antibiotic, sulfazecin, as well as bulgecins. it was first isolated in japan. because this organism is patented, it is not officially recognized as a legitimate pseudomonas species, and therefore has no type strain. it is available, however, through the american type culture collection. pseudomonas acidophila scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. acidophila binomial name pseudomonas acidophilaimdada et al. 1980