PESTICINS I. : Pesticin-bacterium Interrelationships, and Environmental Factors Influencing Activity

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Brubaker, Robert R. (U. S. Army Biological Laboratories, Fort Detrick, Frederick, Md.) and Michael J. Surgalla. Pesticins. I. Pesticin-bacterium interrelationships, and environmental factors influencing activity. J. Bacteriol. 82: 940–949. 1961—A second bacteriocin-like substance produced by all tested strains of Pasteurella pestis and P. pseudotuberculosis is described. This activity, termed pesticin II, is active against the two avirulent P. pestis strains, A12 and Java. These strains do not produce pesticin I, which inhibits the growth of type I strains of P. pseudotuberculosis. Pesticin I was also found to be active against certain strains of Escherichia coli, strain A12, but not strain Java, and some P. pestis isolates which also produce pesticin I. A number of E. coli strains produce a substance which also inhibits the growth of strains A12 and Java; the activity of this substance is dependent upon the presence of high concentrations of Ca++.

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