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I get different maximum rates for the same values of temperature, pH and water activity in the ComBase database and in ComBase predictor. Why?

April 26, 2017activity combase database different maximum pH rates temperature values water

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I get different maximum rates for the same values of temperature, pH and water activity in the ComBase database and in ComBase predictor. Why?

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A. The predicted rates from ComBase Predictor are from models of kinetics in laboratory media whereas some measurements recorded in the ComBase database are in food. In addition, the models are “fail safe”, in that they usually predict faster growth rate or slower death rate than observed.