Heat Inactivation of Bacteriophage Strains Active Against Lactic Streptococci1

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...

The Heat Inactivation of Antistaphylococcus Bacteriophage

Early work on bacteriophage included several studies of the effect of heat on the lytic principle. For example, d'Herelle (1) found Shiga bacteriophage survived exposure to 65°C. for 1⁄2 hour. Kabeshima (2) working with the same phage observed activity after 1⁄2 hour at 70°C. and set the inactivation temperature at 75°C. , using a like period of exposure. Others, particularly Weinberg and Aznar...

Development of bacteriophage-resistant strains of lactic acid bacteria.

One exciting area that has emerged through genetic analysis of the lactococci is the definition and practical application of gene systems that provide phage resistance to these industrially important bacteria. Naturally occurring phage-insensitive strains have been characterized and found to harbour multiple defence systems which can act at different points of the lytic cycle to prevent the suc...

Bacteriophage active against the lactic acid beverage-producing bacterium Lactobacillus casei.

A virulent bacteriophage which causes a decrease in acid production during fermentation of a lactic acid beverage named Yakult with Lactobacillus casei was isolated from the abnormal fermentation tank and named PL-1. L. casei S strain was the exclusive host cell among 18 lactic acid bacteria tested. The plaque was round with an average diameter of about 0.5 mm. It exhibited serological cross-re...

Studies on Bacteriophage and Metabolic Identification of Brucella Strains