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Effect of temperature on the vegetative growth of type and field strains of Bacillus cereus
Author(s) -
Fermanian C.,
Fremy J.M.,
Claisse M.
Publication year - 1994
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/j.1472-765x.1994.tb00970.x
Subject(s) - turbidimetry , bacillus cereus , cereus , strain (injury) , bacillaceae , exponential growth , bacterial growth , food science , microbiology and biotechnology , bacillales , biology , growth medium , bacteria , biochemistry , mathematical analysis , genetics , mathematics , anatomy , bacillus subtilis
Growth of eight selected potentially pathogenic strains of Bacillus cereus was evaluated in a rich medium at different temperatures. No strain grew at 50°C; maximal growth‐permissive temperatures were in the range 46–50°C for six strains and under 46°C for one strain. Faster growth occurred at 42°C. Growth may be delayed at 20°C, where the lag phase can reach 7 h. Furthermore at 20°C, cells generally show an aggregation immediately in the early exponential stage, except for two strains. Owing to this aggregation, growth is more difficult to estimate by turbidimetry at lower temperatures. These data describe the behaviour of type and field strains between 50° and 20°C and can help the prediction of shelf‐life of potentially contaminated products.