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11 Cards in this Set
- Front
- Back
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name the factors affecting the efficacy of antimicrobial methods |
1.site to be treated 2. the relative susceptibility of microorganisms 3. environmental conditions |
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define thermal death point |
is the lowest temperature that kills all cells in a broth in 10 minutes. |
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define thermal death time |
is the time it takes to completely sterilize a particular volume of liquid at a set temperature |
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define Decimal reduction time (D) |
is the time required to destroy 90% of the microbes in a sample |
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define autoclave |
uses steam heat under pressure to sterilize chemicals and objects that can tolerate moist heat |
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name the different methods of pasteurization |
1. historical (batch) method 2. flash pasteurization 3. ultra high pasteurization The methods differ in their combinations of temperature and time of exposure |
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what are some methods for controlling microbes? |
ultra-high-temperature sterilization 2. dry-heat sterilization 3. incineration 4. refrigeration 5. freezing |
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define desiccation |
an antimicrobial method involving drying to preserve food |
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define lyophilization |
(freeze drying)used for the long-term preservation of cells or microbes |
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define filtration |
is the passage of air or a liquid through a material that traps and removes microbes |
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describe membrane filters |
some membrane filters have pores small enough to trap the smallest viruses. HEPA (high-efficiency particulate air) filters remove microbes and particle from the air. |
