the growth rate of potential pathogens has importnat implications for food safte

Question

the growth rate of potential pathogens has importnat implications for food saftey.

a) if salmonella has a generation time of 1 hr on the surface of thawed poultry, how much will the concentration of bacteria increase if the poultry is left at room temperature overnight (12hrs)?

b) if sallmonella has a generation time of 6hr at refrrigerator temperatures, how much will the concentration of bacteria increase if the poultry is kept in the refrigerator for the same amount of time?

c) how much will the concentration of bacteria increase if the poultry is kept in the refrigerator for three days?

Explanation / Answer

a) i we say overnight for 12 hours, then

so, n =12

2^12= 4096 cells

b) 6 hours generation time and 6 hours stored in refrigerator

so, n=1

2^1= 2 cells

3) 3 days, 4 generations for one hour

so, n=12 for 3 hours

2^12

= 4096 cells

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