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  • Title: [Joint culturing of Streptococcus lactis, strain MGU with Proteus vulgaris and Bacillus mesentericus].
    Author: Kozlova IuI, Grushina VA, Baranova IP, Egorov NS.
    Journal: Mikrobiologiia; 1990; 59(4):704-7. PubMed ID: 2124650.
    Abstract:
    Nisin synthesis by Streptococcus lactis, strain MGU, grown as a combined culture together with Proteus vulgaris and Bacillus mesentericus under stationary conditions or with stirring does not depend on the quantity of inoculated associated cells. Nisin synthesis in the combined culture drops down by 10-20% at the initial pH 7.5 of the growth medium which is unfavourable for S. lactis producing nisin. The level of nisin biosynthesis does not rise when the pH of the medium is adjusted (either naturally or artificially) to 6.6-6.8 in the presence of glucose and yeast autolysate. S. lactis inhibits the growth of B. mesentericus when grown together with it whereas P. vulgaris inhibits the growth of S. lactis in their combined culture.
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