survivor curve ⚫ When the microbial populations as a function of time are presented on semilogarithmic coordinates, a linear decrease in microbial population with time is observed. It is the survivor curve. It is emphasized that these relationships occur when the environment around the population is at a constant temperature throughout the period of exposure
survivor curve ⚫ When the microbial populations as a function of time are presented on semilogarithmic coordinates, a linear decrease in microbial population with time is observed. It is the survivor curve. It is emphasized that these relationships occur when the environment around the population is at a constant temperature throughout the period of exposure
Definition of Decimal Reduction Time ⚫On survivor curve, the time required for a one log cycle reduction in microbial population is the decimal reduction time (D), or D- value
Definition of Decimal Reduction Time ⚫On survivor curve, the time required for a one log cycle reduction in microbial population is the decimal reduction time (D), or D- value
Survivor Curves at Different Temp
Survivor Curves at Different Temp
thermal Resistance Curve ⚫ A plot of decimal reduction time as a function of temperature on semilog coordinates results in a linear relationship. This linear relationship is the thermal resistance curve for a given microbial population
thermal Resistance Curve ⚫ A plot of decimal reduction time as a function of temperature on semilog coordinates results in a linear relationship. This linear relationship is the thermal resistance curve for a given microbial population
Thermal Resistance Curve
Thermal Resistance Curve