Flashcard Set Preview
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| 1 |
What is an antimicrobial agent?
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treatments and substances that kill or inhibit microorganisms
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| 2 |
what are some physical antimicrobial agents?
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heat, drying or desiccation, radiation
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| 3 |
What are some chemical antimicrobial agents?
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detergents, solvents, oxidizing agents, heavy metals
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| 4 |
What is the difference between bacteriocidal and bacteriostatic?
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Bacteriocidal kills bacteria, whereas bacteriostatic only slows or stops its growth |
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| 5 |
Why would you want to use a bacteriostatic agent instead of a bacteriocidal agent?
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A bacteriocidal agent could destroy the product you are protecting from bacteria. A bacteriostatic...
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| 6 |
Factors that affect efficiency of a Bacteriocidal treatment are?
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material, i.e. metal vs food
age, species, population size of bacteria
storage temperature,...
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| 7 |
Relative susceptibilities of microbes to antimicrobial agents are?
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picture |
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| 8 |
What are some different methods of sterilization for different materials?
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glassware - steam in autoclave
petri plates - poisonous gas
heat sensitive vitamins - filtration
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| 9 |
What is the effect of bacterial population size on sterilization efficiency?
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graph |
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| 10 |
What is the effect of pH on efficiency of Pasteurization?
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graph |
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| 11 |
How does an antimicrobial treatment kill the bacteria?
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by destroying or damaging a vital cell structure or by inhibiting some vital metabolic reaction
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| 12 |
How does heat kill a bacterial cell?
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by denaturing proteins and nucleic acids
denatured proteins tend to coagulate into an insoluble...
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| 13 |
Which is faster: moist heat or dry heat? why?
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moist heat because heat energy is transferred from the environment into the cell faster due...
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| 14 |
protein denaturization by heat
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breaks up structure |
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| 15 |
Which is hotter: compressed steam or boiling water?
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compressed steam
use this to heat sample to higher temperature
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