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A broth suspension containing 1.20E + 06 bacterial spores A with a D value of 2.3...

A broth suspension containing 1.20E + 06 bacterial spores A with a D value of 2.3 minutes and 8.00E + 06 bacterial spores of bacterium B with a D value of 15 minutes both heated at 121.1 Celsius
a). calculate the time needed to obtain the final microbial amount of 1/1000
minute bacteria A
minute bacteria B
b). Determine the D250 value if after 10 minutes the live spores live only 30 spores
minute bacteria A
minute bacteria B

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