BSC 160 1nd Edition Lecture 20Outline of Last Lecture 1. Controlling Microorganisms2. Terminology3. Microbial Death4. Concerns of Microbial ControlOutline of Current Lecture 1. Radiation2. Filtration3. Qualities of ChemicalsCurrent LectureControlling Microorganisms- RadiationIonizing radiation- deep penetrating power that has sufficient energy to cause electrons to leavetheir orbit, breaks DNA. Used to sterilize medical supplies and food products- Quick, easy, can do a lot at one timeNonionizing radiation- little penetrating power so it must be directly exposedUV light creates pyrimidine dimers, which interfere with replicationRadiation—Sterilizing air, water, or surfaces- Gram- is more susceptible to radiation than Gram+Controlling Microorganisms- FiltrationDepth filters- overlapping layers of fibrous sheetsMembrane filters- Can control pore sizeNucleopore filters- Pores made from weak spots due to radiation. Can control pore sizeDisinfectants, antiseptics, sterilants, degermers, and preservativesDesireable 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
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