Abstract

Twenty three samples of peptones were compared on the capacity and suitability for the growth and tests of some biochemical activities, and on slime layer production of 29 strains of Vibrio parahaemolyticus.In general, peptones from meat, especially of C Co., gave good growth.For the indole reaction, peptones from milk casein of C Co., Bacto-Trypton, and that from soya bean of D Co. were observed suitable ; and those from meat often gaveerroneous results. In the test for gelatin liquefaction, all peptones tested gave good result. Hydrogen sulfide was not produced by all test strains in Kligler medium from all peptones tested, i. e. all peptones were suitable. For reduction of methylene blue, 2 of 3 samples of peptones from soya bean were not suitable.Large quantity of extracellular slime layer substance was produced on agar media from mixed peptones which were composed of those from milk casein and meat, of D Co. and of A Co., and on that from soya bean of D Co.

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