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Review of Physical Methods to Control Microbial Growth quiz

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  • What is dry heat and which techniques are used in this method to control microbial growth?
    Dry heat uses heat without moisture, including incineration and hot air ovens to kill microbes.
  • How does moist heat differ from dry heat in controlling microbial growth?
    Moist heat uses heat with moisture, such as boiling, pasteurization, and autoclaving, to kill microbes.
  • What effect do low temperatures have on microbial growth?
    Low temperatures inhibit microbial growth and help preserve foods by slowing down microbial activity.
  • Which methods are commonly used to apply low temperatures for microbial control?
    Refrigeration and freezing are commonly used to apply low temperatures for microbial control.
  • What is desiccation and how does it control microbial growth?
    Desiccation is the process of drying out, removing moisture from cells to kill microbes.
  • What is lyophilization and how does it combine physical methods to control microbes?
    Lyophilization, or freeze-drying, combines low temperatures and desiccation to preserve foods and control microbes.
  • How does filtration remove microbes from liquids or air?
    Filtration uses filters with very small pores that trap microbes while allowing liquids or air to pass through.
  • What is a HEPA filter and what is its purpose?
    A HEPA filter is a high efficiency particulate air filter used to remove microbes from air.
  • What is irradiation and how does it control microbial growth?
    Irradiation exposes objects to radiation to kill microbes, using either ionizing or non-ionizing radiation.
  • What is the difference between ionizing and non-ionizing radiation in microbial control?
    Ionizing radiation has high penetrative power and can ionize molecules, while non-ionizing radiation has less penetrative power and must be used directly on microbes.
  • How does ionizing radiation kill microbes?
    Ionizing radiation kills microbes by creating reactive oxygen species through ionization of molecules.
  • Why must non-ionizing radiation be used directly on microbes to be effective?
    Non-ionizing radiation has less energy and penetrative power, so it must be applied directly to microbes to kill them.
  • What is high pressure processing and how does it control microbial growth?
    High pressure processing uses extremely high pressures to damage and kill microbes.
  • Which physical method combines both low temperature and desiccation?
    Lyophilization (freeze-drying) combines low temperature and desiccation to control microbial growth.
  • What is the main purpose of using physical methods to control microbial growth?
    The main purpose is to kill or inhibit microbes to preserve food, sterilize materials, and prevent infection.