Q:
I would like to ask how to determine 'growth' and 'survival' of microorganisms from some given data.
For 'growth', if the parameters are out of the minimum or maximum limit of microorganisms, it means that they cannot grow?
A: They cannot grow
Q:
For 'survival', I remembered that you have mentioned microorganisms can actually survive at low temperature and low water activity, even if the conditions are out of their limit. How about pH? Will they just die if the pH is below minimal limit/above maximum limit? And for temperature that is higher than the maximal temperature for growth, does it mean that the microorganisms will die?
A:
pH below minimum or above maximum: Die.
temperature higher than maximum: Die.
But of course, the length of time for the microorganisms expose to these parameters needs to be taken into consideration. If brief exposure, there is D value or similar factors affecting the survival.
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