Anaerobic
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Aerobically different bacteria behave differently when grown in liquid culture:
- Obligate aerobic bacteria gather at the top of the test tube in order to absorb maximal amount of oxygen.
- Obligate anaerobic bacteria gather at the bottom to avoid oxygen.
- Facultative bacteria gather mostly at the top, since aerobic respiration is advantageous (ie, energetically favorable); but as lack of oxygen does not hurt them, they can be found all along the test tube.
- Microaerophiles gather at the upper part of the test tube but not at the top. They require oxygen, but at a lower concentration.
- Aerotolerant bacteria are not affected at all by oxygen, and they are evenly spread along the test tube.
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