Two inhibitors of the 17 tested inhibited growth of gram positive bacteria without causing inhibition of gram negative bacteria. These were crystal violet at 2 mg/1 and neotetrazolium chloride at 2 mg/1. In addition, basic fuchsin at 6 mg/1 produced only marginal reduction in counts of gram negative bacteria. These inhibitors might find further use in developing a test for psychrotrophic bacteria in the presence of non-psychrotrophic bacteria.

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