Calculate the death rate constant

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1) 350 bacterial cells remain after 45 minutes of a disinfection treatment. Assuming that the bacteria are killed at a constant rate throughout this treatment...

a. Calculate the death rate constant (K) if the number of survivors at the 15 minute mark is 6.5 x 104 cells.

b. How many cells will remain after 60 minutes of disinfection?

c. How many cells were there at the start of the disinfection process (i.e. at t = 0 minutes)?

2) If at the start of a disinfection process, there are 5.2 x 105 CFU/mL and D has previously been determined to be 20 minutes, determine whether or not a two hour disinfection treatment will sterilize this culture. Assume that the sample is considered sterile when the concentration is less than 1 cfu/ml. Explain your reasoning and show proof using a calculation!

Reference no: EM132489739

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