Figure 7.2
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 7.2, the decimal reduction time (D value) for the culture is approximately

Question

Figure 7.2
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 7.2, the decimal reduction time (D value) for the culture is approximately

Quizplus · Accepted Answer

The decimal reduction time (D value) is the time required at a certain temperature to kill 90% of the organisms being studied. It is determined by finding the point on the graph where the population has decreased by one log unit (or to 10% of its original number). If the graph shows a reduction from, for example, 10^6 to 10^5 colony forming units (CFU) in 15 minutes, then the D value is 15 minutes.

Figure 7.2 a Suspension of 106 Bacillus Cereus Endospores Was Put in Put