Скачать или смотреть Aerobic And Anaerobic Bacteria | Bacterial Oxygen Requirements | Part 2

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Aerobic And Anaerobic Bacteria | Bacterial Oxygen Requirements | Part 2

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The enzyme, catalase, is produced by bacteria that respire using oxygen, and protects them from the toxic by-products of oxygen metabolism. Catalase-positive bacteria include strict aerobes as well as facultative anaerobes, although they all have the ability to respire using oxygen as a terminal electron acceptor.
Catalase (CAT, 1.11. 1.6) is an antioxidant enzyme present in all aerobic organisms. It is known to catalyze H2O2 into water and oxygen in an energy-efficient manner in the cells exposed to environmental stress.
Ambient oxygen levels kill anaerobes. Anaerobes and facultative anaerobes, or bacteria that ferment and do not respire without oxygen, define catalase-negative bacteria. Their cells can't oxidize the superoxide produced during oxygen saturation because they lack enzymes like superoxide dismutase and catalase.
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