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Decimal Reduction time value for a population of 10,000 bacterial cells after being sterilized for 2 hours?

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A population consists of 10,000 bacterial cells. It is treated with a sterilizing agent. The environment with this population becomes sterile in two hours. What is its D-Value?

 

 

I'm struggling with this question because I thought that in order to get the correct d-value, you needed to have a temperature. ?? Is this not correct? I don't know how to go about solving this problem without that information. Any help??

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