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An obligate aerobe is an organism that requires oxygen to grow. [1] Through cellular respiration , these organisms use oxygen to metabolise substances, like sugars or fats, to obtain energy. [ 1 ] [ 2 ] In this type of respiration, oxygen serves as the terminal electron acceptor for the electron transport chain . [ 1 ]
Aerobic organisms produce superoxide dismutase and catalase to detoxify these products, but obligate anaerobes produce these enzymes in very small quantities, or not at all. [ 1 ] [ 2 ] [ 3 ] [ 5 ] The variability in oxygen tolerance of obligate anaerobes (<0.5 to 8% O 2 ) is thought to reflect the quantity of superoxide dismutase and catalase ...
An aerobic organism or aerobe is an organism that can survive and grow in an oxygenated environment. [1] The ability to exhibit aerobic respiration may yield benefits to the aerobic organism, as aerobic respiration yields more energy than anaerobic respiration. [2] Energy production of the cell involves the synthesis of ATP by an enzyme called ...
Unlike obligate anaerobes however, they are not poisoned by oxygen. They can be found evenly spread throughout the test tube. A microaerophile is a microorganism that requires environments containing lower levels of dioxygen than that are present in the atmosphere (i.e. < 21% O 2; typically 2–10% O 2) for optimal growth. [1]
Aerobic anoxygenic phototrophic bacteria (AAPBs) are Alphaproteobacteria and Gammaproteobacteria that are obligate aerobes that capture energy from light by anoxygenic photosynthesis. Anoxygenic photosynthesis is the phototrophic process where light energy is captured and stored as ATP. The production of oxygen is non-existent and, therefore ...
B. subtilis has historically been classified as an obligate aerobe, though evidence exists that it is a facultative anaerobe. B. subtilis is considered the best studied Gram-positive bacterium and a model organism to study bacterial chromosome replication and cell differentiation.
This allows the differentiation of obligate aerobes, obligate anaerobes, facultative anaerobes, microaerophiles, and aerotolerant organisms. For example, obligately anaerobic Clostridium species will be seen growing only in the bottom of the test tube.
Azotobacter vinelandii, obligate aerobe diazotroph used in nitrogen fixation research. Streptomyces coelicolor, soil-dwelling filamentous bacterium used to produce many clinically useful antibiotics. [2] [3] Archaea: Methanococcus and Methanosarcina, model methanogens, representing the two metabolic types of hydrogenotrophism and ...