MICR-4010 Lecture Notes - Lecture 7: Quinone, Cyanobacteria, Erythrobacter
17 Sep 2018
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Physiological diversity: functions and activities in term of metabolism. Ecological diversity: relationship b/w organisms and environment. Morphological diversity: look at different morphology, shape and. During anoxygenic photosynthesis use only photosystem i. Oxygenic phototrophs (use oxygen as final electron acceptor) Remember: nitrogenase, the enzyme used in the nitrogen fixing process is sensitive to oxygen. Cyanobacteria fix co2 via photosynthesis during the day and during they night they can get energy via fermentation or aerobic respiration. At night they can suppress photosynthetic activity. Get nutrients and carbon from neighboring cells. Synechococcus and prochlorococcus = important for aquatic. Anoxygenic phototrophs that use h2s as electron donor for photosynthesis. Use calvin cycle to fix carbon dioxide. Note: can use sulfide but doesn"t want to. Can use external carbon source instead of fixing it themselves. Under aerobic conditions pigments are not produced which prevents photosynthesis from happening. Some grow using fermentation or anaerobic respiration. Use wide range of carbon sources and electron donors.
