Decay-B4

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  • Created by: Shannon
  • Created on: 07-05-13 18:17
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  • Decay
    • Decay can be increased by temperature,o-xygen and water
      • Optimum temperature: bacteria: 37C, fungi: 25C
        • Increase rate of respiration-high temperatures denature enzymes
      • More oxygen -aerobic respiration-grow and reproduce faster
    • Earthworms, maggots, woodlice
      • Detrivores-feed on decaying material, increase rate of decay, which increases the surface area
    • More water-material absorbed more efficiently-increase growth of bacteria
    • Saprophyte-organism feeds on dead and decaying material, e.g. fungi
      • Extracellular digestion- enzymes digest food outside cells, reabsorb simple soluble solutions
    • Canning-heated, kill bacteria, sealed in a vacuum to prevent entry of oxygen
      • Drying-no water, bacteria cannot feed
        • Salt/sugar-high osmotic concentration will remove water
          • Vinegar-acid conditions kill bacteria
  • Salt/sugar-high osmotic concentration will remove water
    • Vinegar-acid conditions kill bacteria

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