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Appl Environ Microbiol. 1973 April; 25(4): 682-684
Copyright © 1973 American Society for Microbiology. All Rights Reserved.

Induction of Prophage in Streptococcus lactis C2 by Ultraviolet Irradiation¹

^a Department of Food Science and Nutrition, University of Minnesota, St. Paul, Minnesota 55101

ABSTRACT

Streptococcus lactis C2 has been used extensively by many laboratories in studies on the metabolism of lactic streptococci. By using ultraviolet irradiation as the inducing agent, this organism was shown to release a small bacteriophage, indicating that it is a lysogenic strain. The induced phage had a head approximately 40 nm in diameter and a tail length and width of about 180 and 6 nm, respectively. A structure resembling a collar was observed. Attempts to isolate a sensitive indicator strain for the virus were unsuccessful.

¹ Paper no. 8194 of the Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul.