The effect of temperature (1-34 degrees C) on the maximum specific growth rate of Aeromonas salmonicida could not be described by the classical growth models; for some strains, two optimal temperatures at 23 degrees C and 30 degrees C were observed, as well as an unexpected increase in the pseudolag time above 27 degrees C. This could be explained by the presence of two subsets, notably S-layer+ and S-layer- sub-populations. The A- cells had higher growth parameters (Topt and mu opt) than the A+ cells and were selected by subcultures above 30 degrees C. Yet the relative proportion of A+ cells did not explain all the variation of mu max versus temperature, and the growth kinetics of an Aer. salmonicida isolate remained unpredictable.
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| http://dx.doi.org/10.1046/j.1472-765x.1997.00229.x | DOI Listing |
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