9-27-18 Lecture (anno)(1).pdf - CH 7 Controlling Microbial...

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CH 7 Controlling Microbial GrowthSterilization:Disinfection:Antisepsis:Degerming:Sanitation:removal/destruction of all living microbesand spores and viruseskilling of vegetative pathogens on a surface(inanimate objects); usually w/chemicalsreduction of pathogens from living tissue(sepsis /asepsis)removal of transient microbes from skin by mechanicalcleansing or by an antiseptic.reduction of microbial populations on objects tosafelevelsThe prevention, elimination, or control of microbes isimportant in reducing the exposure to pathogenic microbes.
Effect of antimicrobial treatmentsBacteriostaticBacteriocidalExposure to antimicrobials reducescell numbers in an exponentialfashionnegative curveFactors influencing efficacy ofantimicrobial treatments:– Number/types of microbes present– Organic load– Exposure time/dose– pH, temperature
Physical & Chemical Agents of Control
Rate of Microbial DeathData for bacterial cultureheated to 100°C ;Dvalue = ?

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Term
Fall
Professor
Knapp
Tags
A Bacteriostatic

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