Chapter 7 Control of Microbial Growth.docx - Chapter 7...

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Chapter 7 Control of Microbial GrowthControlling Microbial Growth-The prevention, elimination, or control of microbes is important in reducing theexposure to pathogenic microbes-Sterilization: removal/destructing of all living microbes and spores and viruses-Disinfection: killing of vegetative pathogens on a surface (inanimate objects); usuallyw/chemicalsoGenerally harsher because it doesn’t have to worry about hurting tissue-Antisepsis: reduction of pathogens from living tissue (sepsis/asepsis)-Degerming: removal of transient microbes from skin by mechanical cleansing or by anantiseptic-Sanitation: reduction of microbial populations on objects to safe levelsoMore about overall numbers, not specific pathogens. Levels typically determinedby county health departmentsoMaintaining hygieneEffect of antimicrobial treatments-Bacteriostatic: growth inhibition; not a killing effect (slide 3 graph). Viable count plateausoOnce added, dead and live cells are not changing.-Bacteriocidal: a killing effect. Once added number of viable cells die-Bacteriolytic: viable as well as total cell count goes down.Lysing cells (blow them up)-Exposure to antimicrobials reduces cell numbers in an exponential fashion -> negativecurve-Factors influencing efficacy of antimicrobial treatmentsoNumber/types of microbes presentoOrganic load - cleanlinessoExposure time/doseopH, temperatureRate of Microbial Death-

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Term
Spring
Professor
MEDRANO
Tags
Microbiology, Bacteria, Control of Microbial Growth, Microbial Agents, Efficacy of Chemical Agents, Surface Active Agents of Surfactants

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