HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Shehata, T. E. Articles by Collins, E. B. Search for Related Content PubMed PubMed Citation Articles by Shehata, T. E. Articles by Collins, E. B.

Influence of Temperature on the Growth of Psychrophilic Strains of Bacillus

Department of Food Science and Technology, University of California, Davis 95616

ABSTRACT

Specific growth rates, doubling times, and temperature characteristics were determined for 12 cultures of 9 species of Bacillus that had been isolated from milk and found able to grow at low temperatures. Cultures of Group A, psychrophilic strains of B. subtilis, B. circulans, and B. coagulans, grew at 0 ± 1 C and had growth characteristics similar to those reported for psychrophilic species of Pseudomonas. Eight cultures of Group B had minimal growth temperatures of 5 to 7 C and other growth characteristics between those reported for psychrophilic species Pseudomonas and those reported for mesophilic bacteria.

Doubling times for B. circulans RH3, B. laterosporus, and B. coagulans F8 in milk at 7.2 C were 5, 5.5, and 7 hours. These three cultures produced fruity flavor in milk, followed by the production of rancidity by B. circulans RH3 and unclean flavor by the other two cultures. Plate counts at the time of detecting off-flavor were between 1.0 x 10⁶ and 1.0 x 10⁷ per milliliter for B. coagulans F8 and B. laterosporus and about 5.0 x 10⁷ for B. circulans RH3.

This article has been cited by other articles:

				J.J. Tuohy Semi-Aseptic Packaging of Pasteurized Milk Products in Laminated Film Pouches Journal of Plastic Film and Sheeting, January 1, 1986; 2(1): 51 - 62. [Abstract]