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microbiology ch11

physical and chemical control of microbes

namemode of actionused wherepurposetraits
antisepsis - antiseptic destroys or inhibits vegetative pathogens human skin destroy or reduce microbes on human skin
antisepsis - degermination reduces numbers of microbes on skin by hard scrubbing, alcohol wipes, and germicidal soap. human skin destroy or reduce microbes on human skin
Phenolics disrupts cell walls, membranes, and precipitating proteins general disinfection of drains, cesspools, and animal quarters ex Lysol, creolin, aerosol sprays, soaps, kitty litter disinfection one or more aromatic carbon rings with added functional groups
alcohols dissolves membrane lipids, disrupts cell surface tension, and compromises membrane activity; denatures proteins in cytoplasm skin degerming agent, disinfect electrodes, face masks, thermometers disinfect or degerm colorless hydrocarbons with one or more OH- funtional groups
oxidizers 3% damages proteins and lipids skin wound cleansing, bedsore care mouthwashing, contact lens care, surgical utensils antiseptic hydrogen peroxide decomposes into water and oxygen, forming the free radical OH (toxic to cells)
oxidizers 35% damages proteins and lipids large objects -surgical tables, beds, etc sterilization hydrogen peroxide decomposes into water and oxygen, forming the free radical OH (toxic to cells)
surfectants (amphiphilic compounds) (quats) disrupts cell membrane hospitals, homes, industries Quats mixed with cleaning agents are used for disinfection and sterilization. Soaps are used as cleansers and sterilizers. (+) charged end binds with (-) surface proteins on the cell. long uncharged hydrocarbon chain allows detergent to disrupt membrane
sterilization destroys of removes all viable microorganisms (including viruses) using heat or a certain few chemicals inanimate objects such as surgical instruments, syringes, and commercially packaged foods used when it is important for all organisms to be dead
disinfection (physical and chemical processes) destroys vegetative pathogens (not endospores) as well as microbial toxins inanimate objects
decontamination any cleansing technique that mechanically removes microorganisms using a compound such as soap or detergent.; removes waste and physical debris cooking utensils, dishes, bottles, cans, clothing, and air to reduce contamination to safe levels
Created by: bellajerrent429
 

 



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