Abstract
Summary
The stock culture of L. casei 7469 carried in this laboratory contained 6 to 45% (in different experiments) of forms resistant to inhibition by potassium acetate, yet inocula containing up to 12% of the resistant forms were markedly inhibited by potassium acetate apparently because of complex interactions between the resistant and sensitive varieties. Sensitive strains were found to be α-hydroxy acid-dependent (formerly this characteristic has been ascribed only to “mutant” strains). Sensitive strains, although predominating in the authors' stock culture, were not found among 60 isolates from either of two outside cultures of L. casei 7469.
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