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5 Written Questions

5 Matching Questions

  1. Freezing
  2. Staphylococcus aureus
  3. sand filters
  4. activated sludge tank
  5. acetic acid
  1. a clarified water aerated by injection of air. A way to add oxygen so that aerobic microbes will use up oxygen.
  2. b below -20C. Solutes in food depress the freezing point of water. Must have all water in form of solid ice. Can preserve food indefinitely. Some are killed by ice-crystals. Some are simply preserved
  3. c (species) Salt tolerant. Food poisoning in high salt food
  4. d Organic acids. Vinegar. Often added to veggies, meats, mayo (pickles)
  5. e Disinfection after secondary treatment depends on next use. Most effective way to remove giardia and cryptosporidium

5 Multiple Choice Questions

  1. peak efficiency of aerobic microbes in reducing organics. Secondary treatment.
  2. Organic acids. Produced by fermentation. Added to bread (Swiss cheese)
  3. A way to add oxygen so that aerobic microbes will use up oxygen. Water sprayed from rotating booming water trickles through deep bed rocks. Pick up oxygen on rock-layers (biofilm) of decomposers. Remove organics as water passes
  4. inverted by N.Appert, big prize from napoleon. Heating of food in bottles and seal it. Main concern now is growth from any surviving bacterial spores.
  5. (genus) bacteria associated with unpasteurized cheese and "pre-cooked meats"-hot dogs, deli meats

5 True/False Questions

  1. flocculationoccurs throughout secondary treatment. Reduce pathogen by_________________

          

  2. refrigeration0-4C. Slows metabolism and growth. Extend shelf life but not forever. Does create good conditions for psychrophiles. Ex) lactobacillus, listeria, pseudomonas

          

  3. competitionpathogens are trapped in floc. They get killed by _________: intestinal microbes are not well adapted to this environment. Lose out by ____ for nutrients to "good bugs'

          

  4. nitrosaminesin body, we convert nitrites and nitrates to ______ which is CARCINOGENIC.

          

  5. antioxidantsin body, we convert nitrites and nitrates to ______ which is CARCINOGENIC.

          

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