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#Question id: 35937
#XL - U Food Technology
Which of the following are true regarding D-value (Decimal reduction time) in microbial death kinetics?
TLS Online TPP Program
#Question id: 35938
#XL - U Food Technology
Which of the following statements are correct about the Z-value in microbial thermal death kinetics?
A. Z-value is the temperature increase required to reduce the D-value by one log cycle.
B. A higher Z-value indicates that the microorganism is more sensitive to temperature changes.
C. Z-value helps in comparing the thermal resistance of different microorganisms.
D. Z-value is independent of the heating medium.
E. Z-value can be used to optimize time-temperature combinations in thermal processing.
TLS Online TPP Program
#Question id: 35939
#XL - U Food Technology
A bacterial culture has an initial population of 1×104cells/mL. The population doubles every 30 minutes. What will be the population (in cells/mL) after 2 hours?
TLS Online TPP Program
#Question id: 35940
#XL - U Food Technology
In a batch culture, the specific growth rate (𝜇) of a microbe is 0.693 h-1. What is the doubling time (in hours) of this organism?
TLS Online TPP Program
#Question id: 35941
#XL - U Food Technology
A microbial population declines from 1×108CFU/mL to 1×104CFU/mL in 30 minutes during thermal processing. Assuming first-order death kinetics, calculate the decimal reduction time (D-value) in minutes.
(Use: 𝑁=𝑁0×10−𝑡 / 𝐷)
TLS Online TPP Program
#Question id: 35942
#XL - U Food Technology
A microorganism has a D-value of 5 minutes at 121°C. How much time (in minutes) is required to achieve a 6-log reduction at this temperature?
( Time = D × log reduction)