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THE HEAT DISINFECTION OF STREPTOCOCCUS FAECALIS AND STREPTOCOCCUS LACTIS
Author(s) -
WHITE HELEN R.
Publication year - 1952
Publication title -
proceedings of the society for applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0370-1778
DOI - 10.1111/j.1365-2672.1952.tb00002.x
Subject(s) - streptococcus , d value , microbiology and biotechnology , chemistry , food science , biology , bacteria , genetics
SUMMARY: The heat resistance of a number of strains of Streptococcus lactis and Str. faecalis at 60° in Ringer's solution and separated milk has been determined and the Decimal Reduction Times (D.R.T.) calculated. Heating in separated milk at 60° enabled Str. lactis to be sharply differentiated in most cases from Str. faecalis. The latter gave D.R.T. values usually much above 3 min. while the former gave values usually under 1 min. and certainly less than 3 min. Single tests might give misleading results with certain strains. The log. survivor‐time graphs of both species were not always straight lines over all their length. A preliminary period of slow death was frequently observed.