Maple Sirup. XXI. The Effect of Temperature and Formaldehyde on the Growth of Pseudomonas geniculata in Maple Sap

摘要

SUMMARYThe growth ofPseudonmonas geniculatain sterile maple sap in the presence and absence of 5 ppm formaldehyde at several temperatures was investigated. At 27°C, the growth of inocula as low as 103cells/ml was rapid, and the effect of formaldehyde, if any, was negligible. At 7°C, the temperature slowed the growth of the bacteria, particularly in cultures inoculated with 103or 104cells/ml. Formaldehyde further inhibited the cultures, initially causing a decrease in the number of viable organisms and lengthening the lag period before growth began again. This was particularly noticeable in the cultures with the smaller inocul