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_________ is equal to the reciprocal of the slope of the thermal death time curve.

a) F0 value
b) F value
c) D value
d) Z value

Answer: d
Explanation: Z-value is used in the microbial thermal death time calculations. It is defined as the temperature (in degree) at which a tenfold reduction in D-value is attained. It is equal to the reciprocal of the slope of the thermal death time curve.

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