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Destruction or removal of all forms of microbial life including endospores but with the possible exception of prions. |
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Sufficient heat treatment to kill endospores Clostriduim botulinum in canned food |
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Destructive of vegatative pathogens |
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Destruction of vegetative pathogens on living tissue |
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Removal of microbes from a limited area, such as the skin around an injection site. |
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Treatment intended to lower microbial counts on eating and drinking utensils to safe public health levels |
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The death rate of Microbes is always |
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Definition
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1. The number of microbes to begin with. 2. Enviromental Influences 3. Time of Exposure 4. Microbial Characteristics. |
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4 factors influence the effectiveness of antimicrobial treatments: |
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Thermal Death Point (TDP) |
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________ is the lowest temperature at which all the microorganisms in a particular liquid suspension will be killed in 10minutes. |
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is a process of heating a food, usually liquid, to a specific temperature for a definite length of time, and then cooling it immediately. This process slows microbial growth in food. |
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High temperature short time pasteurization |
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Lowers bacterial count, by passing liquid through a heat exchange. |
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is the passage of a liquid or gas through a screenlike material with pores small enough to retain microorganisms . |
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sterilize heat sensitive materials, such as some culture media, enzymes, vaccines, and antibiotic solutions |
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High Efficiency particulate air filters HEPA |
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remove almost all microorganisms larger than about .3 diameter. |
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in the absence of water, microorganisms cannot grow or reproduce but can remain viable for years. |
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What are examples of Ionizing Radiation |
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Definition
Gamma Rays, X Rays, or high energy electron beams. Has a wavelength shorter than that of non-ionizing radiation. |
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Non Ionizing Radiation- Wavelength and example |
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Definition
has a wavelength longer than that of ionizing radiation, usually about 1nm. UV rays is an example. |
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A method of determining the effectiveness of a disinfectant using serial dilutions. |
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An agar-diffusion test to determine microbial susceptibility to chemotherapeutic agents; also called Kirby-Bauer test. |
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Also called carbolic acid. |
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A synthetic derivative of phenol used as a disinfectant. |
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An organic molecule with the functional group—OH. Can effectivley kill bacteria and fungi but not endospores and nonenveloped viruses. |
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Definition
Two of the most commonly used alcohols are ____ and _____. |
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Surface-active agents or surfactant |
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Definition
Any compound that decreases the tension between molecules lying on the surface of a liquid; also called surfactant. |
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Quaternary Ammonium compounds |
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A cationic detergent with four organic groups attached to a central nitrogen atom; used as a disinfectant. |
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A carcinogen formed by the combination of nitrite and amino acids. |
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An organic molecule with the functional group. ________ are among the most effective antimicrobials. |
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