Jan 1, 1976

Influence of growth temperature on glucose metabolism of a psychotrophic strain of Bacillus cereus

Applied and Environmental Microbiology
B H ChungR C Smith

Abstract

The influence of temperature on glucose metabolism of a psychotrophic strain of Bacillus cereus was investigated. The pH of the growth medium and spore-forming frequencies of B. cereus varied when grown at 32, 20, or 7 C. Radiorespirometric analyses revealed that vegetative cells of B. cereus metabolized glucose by simultaneous operation of the Embden-Meyerhof-Parnas pathway and the pentose phosphate pathway. As the growth temperature decreased, glucose was metabolized with increased participation of the pentose phosphate pathway. The shift of cells grown at a higher temperature to a lower temperature increased the relative participation of the pentose phosphate pathway, whereas the shift of cells grown at low temperatures to a higher temperature had the opposite effect. Cells of late logarithmic phase grown at 20 and 7 C oxidized acetate by the tricarboxylic acid cycle reaction. However, cells grown at 32 C failed to oxidize acetate to CO2 to any appreciable extent. The extracellular products resulting from the metabolism of glucose decreased as the growth temperature was lowered. Organic acids were the major extracellular products of cultures grown at 32 and 20 C. Acetic acid, lactic acid, and pyruvic acid together accounted ...Continue Reading

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Mentioned in this Paper

Metabolic Process, Cellular
Organic acids, Gynecological
Pentose Phosphate Pathway
Extracellular
Pyruvate Measurement
Dysentery, Bacillary
Reproduction Spores
Glucose, (beta-D)-Isomer
Lactic Acid Measurement
Oxidation

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