micro test 3 Flashcards
(51 cards)
disinfection
reduces/destroys microbial growth
examples of disinfection
bleach, phenol (Lysol); cleans surfaces
sanitization
reduces/destroys microbial growth to public safe levels
examples of sanitization
detergent, cleaners; dishwashing, cleaning restrooms
sterilization
completely eliminates microbial growth and every other kind of growth
examples of sterilization
autoclaving, radiation; surgery prep
physical methods of control
dry heat, moist heat
refrigeration/freezing
pressure
desiccation (salt/sugar curing)
radiation (UV)
sonication (sound waves breaking holes in the microbes)
filtration (filtering a substance that can’t be heated)
dry heat e.g.
oven
moist heat e.g.
autoclaving, boiling, pasteurization
autoclave
121 degrees C for 15-20 min at 15 psi (sterilize)
boiling
sterilize
pasteurization
sanitize
Thermal Death Time
amount of time required to kill organism
Decimal Reduction
amount of time required to kill 90% organisms
Thermal Death Point
Temp required to kill all microbes in 10 min
static
slows growth/metabolism (bacteriostatic)
cidal
kills (bactericidal)
chemical methods of control
disinfectants
antiseptics
antimicrobials
disinfectants
high concentration used on hard surface e.g. Lysol
antiseptics
weaker than disinfectants used on people e.g. hydrogen peroxide
antimicrobials
taken internally (pill, IV, shot)
types of antimicrobials
antibiotics
antivirals
antifungals
antiprotozoals
anthelminthics
phenolics
e.g. Staphene & Lysol; work through membrane disruption & denature proteins
heavy metals
e.g. copper, silver, nickel, zinc; antimicrobials work through charge disruption
