Some Characteristics of the Growth Inhibitor Produced by a Lactic Streptococcus

In earlier reports (1, 2) it was shown that several stock cultures of Streptococcus lactis and Streptococcus cremoris and a small number of commercial starter cultures produced a heat stable substance that inhibited the growth of LactobaciUus casci. The material also restricted growth of some strains of lactic streptococci as well as single strains of LactobaciUus bulgaricus and Streptococcus liquefaciens. The results were in general accord with those obtained by other workers with inhibitory strains of lactic streptococci.