| 1. | Two sub-types exist : facultative anaerobe and obligate anaerobe.
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| 2. | Comparing to them, obligate anaerobes can be harmed by oxygen.
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| 3. | Halanaerobiales are halophilic obligate anaerobes with a fermentative or homoacetogenic metabolism.
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| 4. | They are obligate anaerobes and oxygen is toxic to them.
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| 5. | However, microaerophiles metabolise energy aerobically, and obligate anaerobes metabolise energy anaerobically.
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| 6. | It is an obligate anaerobe, meaning that oxygen is poisonous to the cells.
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| 7. | This species is an obligate anaerobe and is found in the rumen of cows.
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| 8. | An important distinction needs to be made here between the obligate anaerobes and the microaerophiles.
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| 9. | Microaerophiles, like the obligate anaerobes, are damaged by normal atmospheric concentrations of oxygen.
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| 10. | Obligate anaerobes exist simply because they lost the ability over the course of evolution to operate without oxygen.
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