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A Four-Day Count for Psychrotrophs

Authors: B.H.S. Juffs


Two methods are described by which a count of psychrotrophic organisms may be obtained in four days. Both methods involve preliminary incubation at 15°C for 1 day; one method follows this by three days incubation at 7°C and the other by 3 days at 5°. Counts obtained by both methods were compared with counts obtained by the standard method for counting psychrotrophs, i.e. 10 days incubation at 7°C. Counts obtained by the three methods were not significantly different at the 0.05 probability significance level.

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