Summary Metabolism is one of the things that can be used to classify bacteria. For example aerobic and anaerobic bacteria are differentiated on the bases of their need for oxygen in the metabolism. The following report is a brief overview of bacterial metabolism, that is mostly concentrated on the diffrence between anaerobic metabolism ja aerobic metabolism. Because of the complexity of bacterial metabolism the report is mainly about the fundamental diffrences in catabolism (enzymes used and energy and products that are gained) and the defenceses that are used against oxidative stress. To write this report different literary sources, review journals and articels have been used to describe the metabolism in anaerobes and in aerobes. Sissejuhatus Metabolism on kõikide rakus toimuvate protsesside ja reaktsioonide ühine nimetaja. Need protsessid võib jagada kahte rühma vastavalt lõhustumis (katabolism) või sünteesi protsesside (anabolism) hulka
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