a) F0 value
b) thermal death time
c) D value
d) thermal death point
Answer: b
Explanation: Heat resistance of microorganisms and their spores can be expressed in terms of thermal death time. Microorganisms are more heat resistant than their spores. Heat resistance of ascospores is 60°C for 10-15 min and the heat resistant of vegetative yeast is 50-58°C in 10-15 min.
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