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Glossary of Microbiology Terms: Chapter 11

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physical agent
heat, radiation
chemical agents
disinfectants, antiseptics
mechanical removal agents
filtration, sanitization, degermation
highest resistance
bacterial endospores
moderate resistance
protozoan cysts, zygospores, some viruses (naked) Hepatitis B virus, poliovirus, Staphylococcus aureus, Pseudomonas.
lowest resistance
most bacterial vegetative cells, ordinary fungal spores and hyphae, enveloped viruses, trophozoites (vegetative from of protozoans).
sterilization
process that destroys or removes all viable microorganisms including bacterial endospores.
disinfection
physical process or chemical agent to destroy vegetative pathogen but not endospores
antisepsis
chemical agents applied directly to body surfaces to destroy or inhibit vegetative pathogens-swabbing with alcohol, hydrogen peroxide.
sanitation
cleansing technique that mechanically removes microbes to reduce the level of contaminatns-washing dishes.
aseptic technique
in lab, preventing the introduction of contaminating organisms into cultures-or ourselves.
microbistatic
microbes prevented from multiplying but not killed-prevents growth of microbes.
microbicidal
agent designed to kill microbes.
microbial death
the permanent loss of reproductive capability, even under optimum growth conditions.
factors that influence microbial death
1. the # of microbes-more harder to kill.

2. nature of microbes in popultion, mixtures-more types, harder to kill.

3. temperature and pH of environment-higher temp, easier to kill.

4. mode of action of agent.
sporicide
a chemical agent capable of destroying bacterial endospores.

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