Card Set Information
Microbiology: A human perspective - chapter 5
What is sterilization?
Complete removal of microbes
Uses heat, filtration, chemicals, irradiation
What is Disinfection?
Eliminates most pathogens
What is pasteurization?
Heat treatment that reduces number of microbes in food and drink.
What is decontamination?
Reduce pathogens to levels considered safe
What is degerming/demicrobing?
Decrease number of microbes in a area
used especially on skin
What is sanitization?
Substantially reduced microbial population
What is preservation?
Process used to delay spoilage
Best way to control microbes in daily life?
Best way to control microbes in hospitals?
What is a nasocomial infection?`
Infection caught in a hospital
What does selection of microbial removal procedure depend on?
Type of microbe
Type of environment
Risk of infection
Composition of infected item
What is a critical item?
Comes in contact with body tissues
What is a semi-critical item?
Contacts mucous membranes but does not penetrate skin.
What is a non-critical item?
Contacts unbroken skin only.
How can heat be used to control microbial growth?
Used to sterilize or disinfect
Moist or dry heat
How does moist heat destroy microbes and what are the 3 methods?
What is an autoclave?
Sterilizes items using pressureized steam.
When is filtration used in microbial control?
Used to remove microbes from air
Used to remove microbes from fluids that can't be boiled
How and when is radiation used to control microbial growth?
Used on heat resistant materials
What chemicals are used to control microbial growth?
Alcohol - used in disinfectants and antiseptics
Ozone - used in drinking and waste water
Hydrogen Peroxide - useful as a disinfectant
Phenolics - Lysol ingredient
Chlorine - Pools
What are some chemical preservatives?
Ascorbic, Benzoic and Propionic acids - used in bread, cheese, juice
Nitrates, Nitrites - used in processed meats
How does freezing control microbial growth in food?
Kills 50% of microbes
Irreversibly damages cells