The modified Gompertz model was applied for predicting the growth of Bacillus cereus under various conditions of pH, NaCL concentration of culture medium and temperature. Caluculated values of cell population by the Gompertz model which was estimated parameters using by nonlinear least square method were agreed well with experimental values. The generation time and the lag time were predicted using parameters of Gompertz model which are represented as polynominal functions of pH, NaCL concentration and temperature. The predicted values were approximately equal to the values obtained by Pathgen Modeling Program. We will be able to estimate more safety shelf life of food by using the prediction value of generation time from the result of comparison with the value shown in previous reports. To realize our final goal of expert system for predicting the growth and death of microorganisms on food, it was necessary to acumulate more data of many different kinds of microorganisms.
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