the subbacteriostatic concentrations of methicillin , oxacillin , streptomycin , monomycin , kanamycin , neomycin , tetraolean , sigmamycin , polymyxin m and ristomycin increased the biosynthesis of vitamin b12 by sherman propionic acid bacilli , while benzylpenicillin , ampicillin , tetracyclines , oleandomycin , oletetrin , levomycetin and furadonine in the subbacteriostatic concentrations inhibited this process .
C0030827
benzylpenicillin
C0002680
ampicillin