Abstract
Streptomycin-resistant strains ofBact.lactis aerogeneshave been obtained by (a) direct selection in a minimal salt-glucose medium containing 1 unit/ml. streptomycin (strainRs1). (b) indirect selection in the absence of streptomycin with the replica plating technique (strainRrp). (c) irradiation with ultra-violet light (strainRuv). The rate at which colonies develop when these three strains respectively are inoculated on to minimal agar plates containing 1000 u/ml. streptomycin has been subjected to statistical comparison. The results suggest that a basic similarity exists between the strains. Experiments designed to investigate the possible specific induction of resistance by low concentrations of streptomycin in phosphate buffer suspensions of the organism yielded negative results.
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