Aerobic and Anaerobic Microorganisms

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Mind Map on Aerobic and Anaerobic Microorganisms, created by fidafid96 on 05/30/2016.

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Aerobic and Anaerobic Microorganisms
  1. Anaerobic
    1. 3 Groups
      1. Obligate anaerobes
        1. Descriptions of oxygen requirements: Require the ABSENCE of free O2. Molecules other than O2 act as the final electron acceptor.
          1. The presence of O2 leads to formation of toxic metabolic end products, (e.g. superoxide)
          2. Example: Actinomyces, Bacteroides, Clostridium,
          3. Aerotolerant anaerobe
            1. Descriptions of oxygen requirements: Do not use O2 as a final electron acceptor.
              1. They produce catalase and/or superoxide dismutase, thus are not killed by the presence of O2.
              2. Example: Lactobacillus, Enterococcus, Listeria
              3. Facultative anaerobe
                1. Descriptions of oxygen requirements: Can grow in the presence or absence of free O2.
                  1. Preferentially use O2 for aerobic respiration.
                    1. In O2-poor environment, ananerobic respiration occur. They utilize compounds (e.g. nitrates or sulfates) as final hydrogen acceptors.
                  2. Example: Staphylococci, Streptococci.
                2. Definition: Any organism that does not require oxygen for growth. It may react negatively or even die if oxygen is present.
                3. Aerobic
                  1. 2 Groups
                    1. Aerobes
                      1. Descriptions of oxygen requirements: Requires O2 as the final electron acceptor in the complete oxidative degradation.
                        1. Example: Bacilli, Pseudomonas
                        2. Microaerophiles
                          1. Descriptions of oxygen requirements: Require limited amount of O2 for growth.
                            1. O2 in excess will block the activities of their oxidative enzymes and and results in death.
                            2. Example: Legoinalla, Campylobacter
                          2. Definition: Is an organism that can survive and grow in an oxygenated environment.
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