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Chp 9, Lect. 4 (Non Ionizing Radiation (wavelength is greater than 1 nm,…
Chp 9, Lect. 4
Non Ionizing Radiation
wavelength is greater than 1 nm, does not have enough energy to force electrons out of orbit which makes it nonionizing
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UV light, visible light, infrared radiation, and radio waves are non ionizing radiation out of all these.
this makes nonionizing radiation suitable for disinfecting air transparent fluids and surface of objects
radiation
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ions disrupt hydrogen bonding, oxidize double covalent bonds, and create hydroxyl radicals.
filter
we use filters not only for heat sensitive materials but healthcare workers use filtration to prevent airborne contamination of microbes.
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Osmotic pressure
type of microbial control using the ancient method of high concentration of salt or sugar in foods to stop orr inhibit the growth of microbes.
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Phenol and phenolics
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Phenolics are made up of phenol molecules that have been chemically modified by an addition of reactive atoms
physical agents can be and are sometimes used for disinfection, antisepsis, and preservation.
chemical agents will effect microbes cell walls, cytoplasmic membrane, proteins, and DNA
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negative effects of phenolics bad odor, irritated skin on some people