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lecture 6 - Oxygen Aerobes able to grow in the presence of...

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Oxygen Aerobes: able to grow in the presence of O 2 Obligate aerobes: can not grow without O 2 Anaerobes: can grow in the absence of O 2 Aerotolerant anaerobes: can grow in O 2 , but can not utilize it Obligate anaerobes: growth is inhibited by O 2 Anaerobic organisms are often found in aquatic environments because O 2 is weakly soluble Micro-aerophiles: Grow only at low O 2 levels (< 10%) Facultative Aerobes: Can grow aerobically or anaerobically Aerobic growth is more energy-efficient
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Obligate Aerobe Obligate Anaerobe Facultative Aerobe Micro- aerophile Aerotolerant Anaerobe
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Terminology of Microbial Control Sterilization Destruction or removal of all viable organisms from inanimate objects Autoclave or high energy ionizing radiation Disinfection Killing, inhibition, or removal of pathogens from inanimate objects Phenolics, boiling water, UV radiation Antisepsis Chemicals applied to body surfaces removal of pathogens from living tissues Iodine, ethanol Sanitation Reducing the microbial population to safe levels Cleaning and disinfecting an object
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Physical Agents – Heat Degrade DNA and denature proteins Disrupt cell membranes Pasteurization : – Food industry Boiling water (100 ˚ C) effectively kills vegetative cells and eukaryotic spores ( but not endospores ).
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