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12 Cards in this Set
- Front
- Back
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Define Sterile
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environment free of microbes, viruses, & endospores
***ONLY thing 100% free of microbes |
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Define Disinfection
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process which eliminates most disease-causing microorganisms & viruses from a surface
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Define Pasteurization
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heat tx to reduce # of microorganisms capable of spoiling food
(moderately heat moist) |
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Define Decontaminated
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item that has been treated to reduce # of disease-causing microorgaisms to a "safe" level
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Selection of antimicrobial procedure is based on what (4) factors?
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type of microorganisms
number of microorganisms environmental conditions potential risks of infections |
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Diff btwn critical, semi-critical, & non-critical items
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critical- directly contact & penetrate body tissues (needles, etc)
semi-critical- directly contact mucous membranes (endotracheal tubes, etc) non-critical- directly contact unbroken skin (stethoscope, etc) |
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__________ involves pressurized steam. Items are sterilized at 15 psi, 121 degrees C, for 15 minutes.
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Autoclaving
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Bacillus stearothermophilus requires high heat to kill. What is its optimal growth temperature?
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55 C
(heat sensitive indicator tape can be used to check sterilization) |
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Germicidal chemicals, such as ______________ can be used to sterilize DNA
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ethylene oxide
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How does ultraviolet radiation sterilize?
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damages DNA creating thymine dimers
creates kinks in DNA helix making replication difficult (doesn't kill but makes replication impossible) |
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Presence of what items can interfere w/ sterilization?
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dirt, grease, & bodily fluids
(clean first, then sterilize) |
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Difference btwn bactericidal & bacteriostatic
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bactericidal- KILLS bacteria
bacteriostatic- prevents bacterial growth (doesn't kill) |
