Question 17 How does tyndallization help control microbial growth? ? it uses ionizing radiation to sterilize materials ? it uses high temperatures under dry heat conditions to reduce microbes to ashes and gas ? it uses steam under pressure for variable times leading to disinfection or sterilization ? it uses free-flowing nonpressurized steam (as a moist heat method) intermittently with periods of incubation in between to destroy microbes ? it dehydrates cells using normal room temperature air ? it removes microbes and contaminants by passing water or air through membranes/filters with variable sized pores
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QUESTION 33 Dry heat QUESTION 34 All of the following are methods of disinfection or sterilization, except QUESTION 35 Liquid media containing heat-sensitive components would best be sterilized by
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15. Flash pasteurization, which consists of boiling the milk at 72°C for 20 seconds. 16. A lower concentration of disinfectant or sterilizing agent. 17. A chemical that kills or inhibits microbes and can be safely used on the skin is called a disinfectant. 18. A hot air oven at 180°C for 30 minutes is very effective in killing bacteria. 19. The killing of only vegetative forms of pathogenic microorganisms and not spores on non-living objects is called disinfection. 20. Bactericide is a term used to describe agents that prevent or inhibit bacterial growth. 21. TDT, which is defined as the lowest temperature at which a suspension of microorganisms is killed within 10 minutes. 22. Ionizing radiation is more powerful than non-ionizing radiation in the sterilization of plastics.
Understand and compare various physical methods of controlling microbial growth, including heating, refrigeration, freezing, high-pressure treatment, desiccation, lyophilization, irradiation, and filtration. Understand and compare various chemicals used to control microbial growth, including their uses, advantages and disadvantages, chemical structure, and mode of action.
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