Ch.5: Control of Microbal Growth

30 terms by girlnamedpaige 

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sterilization

destroying all forms of microbal life

disinfection

destroying pathogen & growing cells, but not spores and viruses

germicide

a chemical that quickly KILLS microbes but not necessary spores

bacteriostatis

inhibiting BACTERIAL growth but not killing the cells

asepsis

the absence of pathogens from an object or area

degerming

the temporary removal of microbes

sanitzing

reducing pathogens to safe levels for the general public

opportunistic pathogen

CAUSES DISEASE under unusual conditions

heat

the most common method used to kill microbes

thermal death point

the lowest TEMPERATURE required to KILL all the microbe in 10 minutes

thermal death time

the minimum TIME needed to KILL all microbes at a given TEMPERATURE

decimal reduction time

the time required for 90% to be killed at a certain temperature

filtration

passing through small pores

dessication

drying out

ionizing radiation

short wavelength high energy rays, react with water to form TOXIC oxygen molecules

nonionizing radiation

long wavelengths that damage DNA or heat water in cells

phenol

damages the cell membrane and proteins and kills everyting

chlorhexidine

damages the microbes cell, but not spores

halogens

[flourine, chlorine, bromine, iodine] react with H2O to form acids and damage amino & fatty acids

alcohol

it kills bacteria and fungi but not spores or virus, by damaging membranes and proteins

heavy metals

high atomic WEIGHT elements [ag, hg, cu, zu] damage proteins

surface active agents

lower SURFACE tension and break membranes into tiny droplets

quaternary ammonium compounds

change cell permeability causing the cytoplasm to leak out

acids

inhibits molds, are safe for humans

aldehydes

damage proteins, kill bacteria and viruses in minutes, kills spores in a few hours

gaseous chemosterilizers

denature proteins, kill all microbe and spores, but may cause CANCER

oxidizing agents

produce toxic OXYgen molecules and some spores

phenol coefficient test

compares the effect of a test chemical with phenol

dilution test

bacteria are added to serial DILUTIONS of the TEST chemical and the amount

filter paper

a piece of filter paper that has been soaked with the test chemical is placed on top of bacteria growing in a petri dish and the zone of inhibition is measured

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