micro notes chap 6

micro notes chap 6 - The Control of Microbial Growth...

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1 The Control of Microbial Growth ± ± Asepsis is the absence of significant contamination. ± Aseptic surgery techniques prevent microbial contamination of wounds. Terminology ± Sterilization: ± Commercial sterilization: Killing C. botulinum endospores ± Disinfection: ± Antisepsis: Removal of pathogens from living tissue ± Degerming: Removal of microbes from a limited area ± Sanitization: Lower microbial counts on eating utensils ± Biocide/Germicide: ± Bacteriostasis: Bacterial populations die at a constant logarithmic rate Effectiveness of Antimicrobial Treatment ± Depends on: ± ± Environment (organic matter, temperature, biofilms) ± ± Microbial characteristics Actions of Microbial Control Agents ± Alternation of membrane permeability ± ± Damage to nucleic acids Heat ± Moist heat denatures proteins ± Autoclave: Physical Methods of Microbial Control ± Pasteurization reduces spoilage organisms and pathogens ± Equivalent treatments ± 63°C for 30 min ±
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micro notes chap 6 - The Control of Microbial Growth...

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