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Journal of Dairy Science Vol. 45 No. 1 32-35
© 1962 by American Dairy Science Association ®
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Failure in the Production of Citrate Permease by Streptococcus diacetilactis

E. B. Collins and R. J. Harvey

Department of Food Science and Technology, University of California, Davis

ABSTRACT

Five strains of Streptococcus diacetilactis contained variants unable to form acetoin and gas from citrate. The variants differed from parent-type bacteria by not producing citrate permease, required for transporting citrate through the cell permeability barrier. Production of citritase by the acetoinless mutants distinguished them from cultures of Streptococcus lactis and Streptococcus cremoris.






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Copyright © 1962 by the American Dairy Science Association ®.