Figure 7.1

A suspension of 10⁶ Bacillus cereus endospores was put in a hot-air oven at 170°C.Plate counts were used to determine the number of endospores surviving at the time intervals shown.
-In Figure 7.1,what is the thermal death time?
A)150°C
B)60 minutes
C)120 minutes
D)100°C
E)The answer cannot be determined based on the information provided.

Question

Figure 7.1
  
A suspension of 10⁶ Bacillus cereus endospores was put in a hot-air oven at 170°C.Plate counts were used to determine the number of endospores surviving at the time intervals shown.
-In Figure 7.1,what is the thermal death time?
A)150°C 
B)60 minutes 
C)120 minutes 
D)100°C 
E)The answer cannot be determined based on the information provided.

Quizplus · Accepted Answer

The thermal death time is the amount of time required to kill all organisms in a given population at a particular temperature. In this case, it can be observed from the figure that all the endospores were killed after 60 minutes at 170°C. Therefore, the thermal death time is 60 minutes at 170°C.

Figure 7.1 a Suspension of 10⁶ Bacillus Cereus Endospores Was Put in Cereus