BSC 160 1nd Edition Lecture 20 Outline of Last Lecture 1 Controlling Microorganisms 2 Terminology 3 Microbial Death 4 Concerns of Microbial Control Outline of Current Lecture 1 Radiation 2 Filtration 3 Qualities of Chemicals Current Lecture Controlling Microorganisms Radiation Ionizing radiation deep penetrating power that has sufficient energy to cause electrons to leave their orbit breaks DNA Used to sterilize medical supplies and food products Quick easy can do a lot at one time Nonionizing radiation little penetrating power so it must be directly exposed UV light creates pyrimidine dimers which interfere with replication Radiation Sterilizing air water or surfaces Gram is more susceptible to radiation than Gram Controlling Microorganisms Filtration Depth filters overlapping layers of fibrous sheets Membrane filters Can control pore size Nucleopore filters Pores made from weak spots due to radiation Can control pore size Disinfectants antiseptics sterilants degermers and preservatives Desireable qualities of chemicals These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Prevent infection Act quickly low concentration Soluble in water or alcohol Stability Have broad sprectrum low toxicity
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