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lab 22thru
lab 22 thru
22
Microbiology
Undergraduate 2
12/05/2010

Additional Microbiology Flashcards

 


 

Cards

Term
psychorphilic
Definition
optimal growth range o-20C
Term
psychotrophic
Definition
optimal growth 20 to 30 c
Term
mesophilic
Definition
optimal growth 25 to 40 C
Term
thermophilic
Definition
optimal growth 45 to 65 c
Term
hyperthermophilic
Definition
optimal growth 80 c or higher
Term
dry heat
Definition
hot air ovens or incineration. It denatures enzymes, dehydrates microbes and kills by oxidation effects 170 degress for 2 hours
Term
moist heat
Definition
denatures enzymes. methods are pateurization, boiling and autoclaving
Term
how does pasterurization work?
Definition
temp maintained at 63degress for 30 min or 72 degrees for 15 minutes.
Term
boiling
Definition
100degrees celsius for 10 minutes will kill vegetative cells but not inactivate endospores.
Term
Autoclaving
Definition
moist sterilization. steam under pressure. 15psi at 121C for 15 minutes. can kill endospores
Term
Thermal death time or TDT
Definition
length of time it takes to kill bacteria in a liquid culture at a given temperature.
Term
thermal death point tdp
Definition
temperature required to kill all bacterial in liquid culture in 10 minutes
Term
decimal reduction time drt or d value
Definition
time in minutes in which 90% og s population of bacteria at a given temperature will be killed
Term
radiant energy spectrum
Definition
shorter wavelengths have more energy, radiations differs in wavelength and energy
Term
ionizing radiation
Definition
xrays and gamma rays. they ionize water into highly reactive feree radicals with unpaired electrons that can break strands of DNA
Term
nonionizing wavelengths
Definition
used in biochemical processes.
Term
ultraviolet
Definition
nonionizing radiation between 15 and 400nm
Term
animal cells synthesize vitamin d in light around
Definition
300nm
Term
wavelenthts below_______are absorbed in the air and do not reach living organisms
Definition
200nm
Term
biocidal wavelengths
Definition
UVC range 200-290 nm optimal absorption wavelengths of DNA 320-400nm
Term
UVB wavelengths
Definition
290-320 nm can cause damage to dna
Term
320-400nm wavelengths not readily absorbed therfore less active on living organisms
Definition
UVA
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