Answered: Why are contaminants such as TCE… | bartleby

Nutrition Now

8th Edition

ISBN:9781337415408

Author:Brown

Publisher:Brown

Chapter21: Phytochemicals

Section: Chapter Questions

Problem 17RQ

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Why are contaminants such as TCE (trichloroethylene) and PCB
(polychlorinated biphenyls) so difficult to remove using traditional
methods?
They easily adsorb onto organic matter in the environment
They are too toxic to be safely handled
They are so volatile they escape into the atmosphere so they're impossible
to contain
O They naturally degrade into harmless forms that cannot be distinguished
from the natural

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For each item on the following list, propose a reasonable method ofsterilization. You cannot use the same method more than three timesfor the whole list. The method must sterilize, not just disinfect; and themethod must not destroy the item or render it useless unless there is noother choice. After considering a workable method, think of a methodthat would not work. Note: Where an object containing something isgiven, you must sterilize everything (for example, both the jar and thepetroleum jelly [Vaseline] in it). Some examples of sterilizing methodsare autoclave, ethylene oxide gas, dry oven, and ionizing radiation.room airseruma pot of soilplastic Petri dishesheat-sensitive drugscloth dressingsleather shoes from a thrift shopa cheese sandwicha flask of nutrient agaran entire room (walls, floor,etc.) rubber glovesdisposable syringescarcasses of cows with “madcow” diseaseinside of a refrigeratorwinea jar of Vaselinefruit in plastic bagsmilkorchid seedsmetal instrumentsmail contaminated…
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Sterility: is achieved by most disinfectants and antiseptics (i.e., chemical agents) O is achieved by soap and water is the absence of PATHOGENS or spoilage-causing microbes ONLY Cannot be achieved by ethylene oxide O CANNOT be achieved by autoclaving O is the absence of ALL living cells and endospores
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A chemical, produced by a microbe to inhibit the growth of other microbes, is isolated and then modified in a chemical reaction in the laboratory. Which of the following terms would most accurately apply? O Synthetic O Antibiotic O Phenolic O Microbistatic O Opportunistic

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