Q.71
What does the thermal death curve represent?
- Concept of Thermal Death Time (TDT) Curve:
- Mathematical & Kinetic Definition:
- The TDT curve plots the heating time required to achieve a designated lethal destruction of a microbial population against exposure temperature on semi-logarithmic paper.
- Characterizes the relationship between processing temperature and microbial destruction rate, defining the thermal resistance constant ($z$-value, the temperature change needed to alter the $D$-value by a factor of 10).
- Conclusion: The relationship between temperature and microbial death rate (Option 3).
Correct option: (3) The relationship between temperature and microbial death rate
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