Teaching Discussion on Experimental Pathogenic Bacteria-detection Training for Food Quality and Safety Undergraduate Students / 微生物学通报

Teaching principles and class content were stated for a experimental course of common pathogenic bacteria detection methods for the undergraduate student in food quality and safety major. They include course material preview, advanced teaching methods, combination of teaching and research, graduate teaching assistant, experimental reports writing and experimental skills evaluation. All these means lead to a good teaching outcome.

Development of Predictive Model for Combined Effect of Temperature and Salinity on the Growth of Vibrio parahaemolyticus / 微生物学通报

Based on the standard strain-Vibrio parahaemolyticus BJ1.1997, temperature (7?C～43?C) and salinity (0.5%～9.5% NaCl) which affected its growth status was studied with uniform design. The results showed that Logistic equation was optimal in primary models, the second was Gompertz equation, the last was Linear equation, so growth parameters can calculated from Logistic equation. The secondary model was developed by square root models, its r value was 0.9863, the lowest growth temperature was 9.0506?C and the highest growth salinity was 5.93% [the corresponding lowest growth water activity (Aw min) was 0.9227]. Through F test, residual analysis and evaluation by bias factor and accuracy factor, the model can exactly describe the relationship between the growth rate and combined effect of temperature and salinity (water activity).