Physical Control of Microbial Growth / controlling microbes

Disinfection

• Disinfection is the process of removing micro-organisms, including potentially pathogenic ones, from the surfaces of inanimate objects.

Pasteurization

heated, keeps integrity

Antiseptic

• kills disease, safe on human skin

Antibiotic

• chemical that controls growth of organisms

Bacteriostatic

• inhibitory for growth

Bacteriocidal

• agent that kills an organism

narrow spectrum

• can only control specific organisms

broad spectrum

• can control large amounts of organisms

selective toxicity

• selectively harms some organisms

methods of physical control

• heat

• cold storage

• dehydration

• radiation

• filtration

• osmotic pressure

types of heat

• moist 60-135 degrees c

• dry >160

filtration

removes microbes from air and liquids

HEPA - high efficiency particulate air filter in hospitals

categories of chemicals

• chlorine

• ethyl alcohol

• hydrogen peroxide

• quaternary ammonium

• ethylene oxide gas

MIC

• minimum inhibitory concentration the lowest concentration of antibiotic needed to inhibit bacterial growth

MBC

minimum bactericidal concentration, the lowest concentration of antibiotic needed to kill all microorganisms