Symbiosis Among Lactic Streptococci

Morphology of the bacteriophages of lactic streptococci.

Electron microscope studies have been made of a number of phages of lactic streptococci, seven of which were phages of Streptococcus lactis C10. Two of the phages are thought to be identical; five have been classified by the method of Tikhonenko as belonging to group IV (phages with noncontractile tails) with type III tail plates; one belongs to group V (phages with tails possessing a contracti...

Action of bacteriophage on mixed strain cultures. IV. Domination among strains of lactic streptococci.

Mixed strain cultures, used extensively for the manufacture of certain dairy products, have generally been thought to give a measure of protection against possible serious retardation of acid development resulting from attack by bacteriophages. Yet little information is available as to the influence that continued propagation has on the individual strains of lactic streptococci. Nichols and Ine...

Acetate and oleate requirements of the lactic group of streptococci.

The need for a chemically defined medium in which strains of Streptococcus lactis and Streptococcus cremoris would grow was felt in this laboratory while work was being done with bacteriophages active against strains of the lactic group of streptococci. Storrs and Anderson (1949) have reported that the medium of Niven (1944), modified by the substitution of lactose for glucose and the addition ...

Influence Of Surface Active Agents On Some Lactic Streptococci

Heat inactivation of bacteriophage strains active against lactic streptococci.

The purpose of this investigation was to obtain further information on the time-temperature relationships in the heat inactivation of bacteriophage strains active against Streptococcus lactis and Streptococcus cremoris and to determine whether the heat resistance characteristics of various bacteriophage strains were related to other criteria used in bacteriophage classification. Harriman, in hi...