Match the description to the correct microbial control method. Answers may be used more than once. reduces the bacterial population of a liquid such as milk and destroys organisms that may cause spoilage and human disease pasteurization using a direct flame to kill microbes sterilization mechanical method used to remove microorganisms from a solution, organisms are trapped in the pores of the filter filtration Moist heat in the form of pressurized steam is regarded as the most dependable method for sterilization autoclave change in the chemical or physical property of a protein. denaturation the destruction of all microbes, including endospores and viruses, on an object or in an area sterilization
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Physical & Chemical Methods of Microbial Control Which of the following methods would be used for controlling microbial for each situation below? Remember, physical or chemical controls used in tandem are more effective than one alone and if you are going to eat something, you have to consider whether the microbial control destroys edibility or taste. List the 2 most common methods using the letter from the right hand column. Situation requiring microbial control Letter representing the most common methods used to control microbial growth in this specific situation Fresh milk Bean sprouts used raw in a salad Beef jerky Drinking water Liquid coffee creamer (not refrigerated) Plastic materials for surgery Hospital floor area contaminated with feces Injection site on skin HBV-contaminated needles Bacterial media
Adi S.
Match the terms with the definitions: A. Sterilization B. Disinfection C. antisepsis D. sanitization E. degerming F. commercial sterilization 1. mechanical removal of microbes from an area. 2. Destruction of all form of microbes including endospores. 3. Destruction of harmful microbes from an inanimate object. 4. Lowering the microbial count to a safe level. 5. Destruction of C. botulinum endospores. 6. Destruction of harmful microbes from a living tissue. 7.Compare autoclaving and hot air sterilization What form of heat is used (moist / dry) Temperature -time required for sterilization Uses 8.Write an example of chemical sterilant and its use. 9. How does filtration achieve sterilization? Examples of products that are filter sterilized.
Dr. Anas S.
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.
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