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TEMPERATURE VARIABILITY WITHIN BACTERIOLOGICAL INCUBATORS
Author(s) -
HOSKING ZENA D.
Publication year - 1957
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1957.tb04513.x
Subject(s) - incubator , incubation , pasteurization , shelf life , biology , zoology , environmental science , food science , microbiology and biotechnology , biochemistry
SUMMARY: Temperature variability within four bacteriological incubators regulated for 30° has been studied using readings taken from the normal thermometers and from others placed on the incubator shelves. During 5‐day incubation periods, differences between readings from individual thermometers and between thermometers on different shelves in the same incubator rarely exceeded 0·5° and 1° respectively. The mean temperature recorded on the top shelf was significantly higher ( P <0·05) than that on the bottom shelf for all incubators, and than that indicated by the normal thermometers for two incubators. Colony counts for pasteurized milk were not materially affected by within incubator temperature differences in this experiment nor, at three of the four centres, by removal from the incubators for brief periods for counting after intermediate incubation times.