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27 Cards in this Set

  • Front
  • Back
the removal of all microorganisms, including endospores
a sterilizing agent
a process of treating canned goods aimed at destroying the endospores of Clostridium botulinum
commercial sterilization
any treatment used on inanimate objects to kill or inhibit the growth of microorganisms
what is the chemical used in disinfection called
a chemical method for disinfection of the skin or mucous membranes
the chemical used in antisepsis
the removal of microoganisms in an area
the removing of microbes from eating utensils and food preparation areas
a substance capable of killing microorganisms
a substance capable of killing microorganisms
a treatment capable of inhibiting bacterial growth
the presence of a toxin or pathogenic organism in blood and tissue
the absence of contamination by unwanted organisms
the temperature required to kill all the bacteria in a liquid culture in 10 minutes
thermal death point (TDP)
the length of time required to kill all bacteria in a liquid culture at a given temperature
thermal death time (TDT)
The time in minutes required to kill 90% of a bacterial population at a given temperature
decimal reduction time (DRT)
what is also called D value
decimal reduction time (DRT)
equipment for sterilization by steam under pressure, usually operated at 15 psi and 121*C
describe the patterns of microbial death caused by treatments with microbial control agents
when bacterial populations are heated or treated with antimicrobial chemicals, they usually die at a constant rate
Describe the effects of microbial control agents on cellular structures.
Damage to the lipids or proteins of the plasma membrane by antimicrobial agents causes cellular contents to leak into the surrounding medium and interferes with the growth of the cell.
Compare the effectiveness of moist heat (boiling, autoclaving, pasteurization) and dry heat
Boiling kills vegetative forms of bacterial pathogens, autoclaving is used to sterilize culture media, instruments, dressings, etc and pasteurization eliminates pathogenic microbes and lowers microbial growth. Dry heat kills by oxidation effects.
a method of determining the effectiveness of a disinfectant using serial dilutions
use-dilution test
an agar-diffusion test to determine microbial susceptibility to chemotherapeutic agents
Disk-diffusion method
disk-diffusion method is also called
Kirby-Bauer test
List the factors related to effective disinfection.
The label, the concentration, nature, pH of the medium, and whether the microbe will easily make contact with the microbes.
How do you interpret the results of use-dilution tests and the disk-diffusion method?
after exposure to the chemical, the cultures are injected into embryonated chicken eggs