SUMMARY: The growth and amylase activity of a streptomycin-dependent Vibrio comma on starch agar plates was gradually decreased with decrease of the streptomycin-concentration. The concentrations of streptomycin and the streptomycin-antagonizing properties of bacterial products also could be assayed by a cup plate method. The diameters of the zones of decomposed starch around the cups were proportional to the logarithms of streptomycin concentration. In the presence of a constant concentration of streptomycin they were inversely proportional to the concentration of bacterial antagonist. The following species and genera of microorganisms produced antagonists (in decreasing order of their activity): sp., sp., and some strains of the genera and . No inhibitory effects were observed with products of and sp., .


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