Figure 26.1 Decimal reduction 100 time(D) 50C 10 70C D is the time at which 60C only 10%of the original 1 population of organisms remain viable at a given temperature. 0.1 Effect of temperature on the viability of a mesophilic bacterium.The decimal reduction time,D,was obtained for the same mesophilic organism at three different temperatures.For 70C,D=3 min;for 60C,D=12 min;for 50C D=42 min.Figure 26.1 Decimal reduction time (D) Time (min) Survival fraction (log scale) 70C 60C 50C © 2012 Pearson Education, Inc. D is the time at which only 10% of the original population of organisms remain viable at a given temperature. Effect of temperature on the viability of a mesophilic bacterium. The decimal reduction time, D, was obtained for the same mesophilic organism at three different temperatures. For 70C, D = 3 min; for 60C, D = 12 min; for 50C, D = 42 min