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Physical and Chemical Agents

Physical and Chemical Agents
If a canning procedure is not properly followed, which type of microbe is most likely to grow in the canned food?

Mesophile
Obligate Anaerobe
Acidophile
Obligate Aerobe

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Physical and Chemical Agents
Sweet and salty foods frequently don't require refrigeration to prevent spoilage because they have

insufficient nutrients
low pH
high concentration of solutes
toxic alkaline chemicals

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Physical and Chemical Agents
Which of the following material is sterilized by use of red heat?

Glass slides
Inoculating wires and loops
Soiled dressings
All-glass syringes

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Physical and Chemical Agents
Which of the following methods will not sterilize?

121°C at 15 lb/in pressure for 15 to 20 minutes
Aqueous glutaraldehyde for 10 hours
Dry heat at 171°C for 1 to 2 hours
100°C boiling water for 30 minutes

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Physical and Chemical Agents
One drawback to the use of ultraviolet light as a sterilizing agent is its

failure to kill bacteria
failure to kill microbes located in the center of an object
failure to kill microbes in a closed environment
failure to bacterial spores

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Physical and Chemical Agents
The time in minutes at a specific temperature needed to kill a population of cells is the

thermal death point
decimal reduction time
F value
thermal death temperature

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