BIOL 2300 Lecture Notes - Lecture 5: Gamma Ray, Disinfectant, Membrane Technology
Document Summary
Sterilization: removal of all organism: filtration, heat chemicals, and irradiation. Disinfection: eliminates most pathogrns: disinfects: inanimate objects and surfaces, antiseptics: used on living tissues. Pasteurization: brief heat treatment to reduce organisms that cause food spoilage: louis pastuer, wine, beer, and milk. Decontamination: treatment to reduce pathogens to safe levels. Sanitization: substantially reduces microbial population to meet health standards. Preservation: process used to delay spoilage of perishable items: approaches: Washing or scrubbing with soap: soap: agent that aids removal. Prevent nosocomial infections: most common, easily preventative, sterilize instruments. Aseptic technique and sterile media for growth. Chemicals prevent spoilage: toxicity is a disadvantage. Chlorine to disinfect water: can react with naturally occurring dbp, some are resistant, selection: Resistant: endospores, protozoan cycts and ocyts, mycobacterium, pseudomonas species, and naked viruses. Commercial effectiveness is determined by decimal radiation time: [d] value, time to kill 90% of bacterium. Critical item:s contact with skin: needles and scapels.
