ISSN:
1750-3841
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
,
Process Engineering, Biotechnology, Nutrition Technology
Notes:
The growth of two strains of coagulase-positive Staphylococcus aureus was measured in whole and skimmilk and in broth at 5, 10, 22, 30 and 37° There was a continuous decrease in population in all media at 5°. The medium had little effect on the duration of the logarithmic growth phase which varied from 12 hr at 37° to 20 days at 10°. Typical generation times in whole milk varied from 1642 min at 10° to 45 min at 37°. At 10 and 22° there was no statistically significant difference in the generation times among media or between strains. At, 30 and 37° there was no significant difference between the generation times in skimmilk and whole milk, but the generation time was significantly shorter (at the 5% level) in the broth than in the milks. The cultures maintained a longer stationary growth phase and were more persistent in broth and skimmilk than in whole milk. More rapid decreases in population in the whole milk were attributed to the toxicity of fatty acids released by the lipase of S. aureus. The decline in pH of the substrate was approximately proportional to the increase in population.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2621.1965.tb00314.x
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