Term
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Definition
| optimal growth range o-20C |
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Term
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Definition
| optimal growth 20 to 30 c |
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Term
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Definition
| optimal growth 25 to 40 C |
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Term
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Definition
| optimal growth 45 to 65 c |
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Term
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Definition
| optimal growth 80 c or higher |
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Term
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Definition
| hot air ovens or incineration. It denatures enzymes, dehydrates microbes and kills by oxidation effects 170 degress for 2 hours |
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Term
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Definition
| denatures enzymes. methods are pateurization, boiling and autoclaving |
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Term
| how does pasterurization work? |
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Definition
| temp maintained at 63degress for 30 min or 72 degrees for 15 minutes. |
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Term
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Definition
| 100degrees celsius for 10 minutes will kill vegetative cells but not inactivate endospores. |
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Term
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Definition
| moist sterilization. steam under pressure. 15psi at 121C for 15 minutes. can kill endospores |
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Term
| Thermal death time or TDT |
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Definition
| length of time it takes to kill bacteria in a liquid culture at a given temperature. |
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Term
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Definition
| temperature required to kill all bacterial in liquid culture in 10 minutes |
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Term
| decimal reduction time drt or d value |
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Definition
| time in minutes in which 90% og s population of bacteria at a given temperature will be killed |
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Term
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Definition
| shorter wavelengths have more energy, radiations differs in wavelength and energy |
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Term
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Definition
| xrays and gamma rays. they ionize water into highly reactive feree radicals with unpaired electrons that can break strands of DNA |
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Term
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Definition
| used in biochemical processes. |
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Term
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Definition
| nonionizing radiation between 15 and 400nm |
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Term
| animal cells synthesize vitamin d in light around |
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Definition
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Term
| wavelenthts below_______are absorbed in the air and do not reach living organisms |
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Definition
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Term
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Definition
| UVC range 200-290 nm optimal absorption wavelengths of DNA 320-400nm |
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Term
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Definition
| 290-320 nm can cause damage to dna |
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Term
| 320-400nm wavelengths not readily absorbed therfore less active on living organisms |
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Definition
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