11. Controlling Microbial Growth

Compare and contrast desiccation and lyophilization.

Which type of radiation is used to preserve foods?

a. Ionizing

b. Nonionizing

c. Radiowaves

d. Microwaves

e. All of the above

This method of physical microbial control combines the removal of all moisture with extremely low temperatures.

Which of the following cannot be used to sterilize a heat-labile solution stored in a plastic container?

a. Gamma radiation

b. Ethylene oxide

c. Supercritical fluids

d. Autoclaving

e. Short-wavelength radiation

Indicate whether the following statement is true or false. Rewrite the underlined phrase to make a false statement true.

_______Pasteurization kills mesophilic microorganisms except endospore formers.

How does desiccation control microbial growth?