Test 2 Vocab - Study Guide 4 Microbial growth and control...

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Study Guide 4 – Microbial growth and control Antiseptic – a growth inhibiting agent used on tissues to prevent infection Autoclave – sterilization chamber which allows use of steam under pressure to sterilize materials. 121 degrees Celsius, under 15 psi Bactericidal – an agent that kills bacteria Bacteriostatic – any process or agent that inhibits bacterial growth Binary fission – formation of two new cells of approximately equal size as result of parent cell division Death phase – end of cell growth due to lack of nutrition, depletion of environment, and accumulation of wastes. Population cells begin to die. Denature – loss of normal characteristics resulting from some molecule alteration. Usually in reference to action of heat or chemicals on proteins whose function depends upon unaltered tertiary structure. Disinfection – destruction of pathogenic nonsporulating microbes or their toxins, usually on inanimate surfaces. Exponential growth – period of maximum growth rate in a growth curve. Cell population increases logarithmically Irradiation – application of radiant energy for diagnosis, therapy, disinfection, or sterilization Lag phase – early phase of population growth during which no signs of growth occur Log phase – maximum rate of cell division during which growth is geometric in its rate of increase. Pasteurization – heat treatment of perishable fluids such as milk, fruit juices, or wine to destroy heat-sensitive vegetative cells, followed by rapid chilling to inhibit growth of survivors and germination of spores. It prevents infection and spoilage. Sanitization – to clean inanimate objects using soap and determining agents so that they are safe and free of high levels of microorganisms. Sterilization – any process that completely removes or destroys all viable microorganisms, including viruses, from an object or habitat. Material so treated is sterile. Thermal death point – the least time required to kill all cells of a culture at a specified
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Test 2 Vocab - Study Guide 4 Microbial growth and control...

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