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 •A n t i s e p s i s – 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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lecture 6 - Oxygen Aerobes: able to grow in the presence of...

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