BIOL240 Lecture Notes - Lecture 9: Purple Sulfur Bacteria, Green Sulfur Bacteria, Ammonia Monooxygenase
29 Jun 2017
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Common in environment, easily cultivated, and lots of diversity within this class. Traditionally recognized classes include alpha, beta, gamma, delta and epsilon: zeta-proteobacteria are recognized, but not as characterized. Pre(cid:448)iousl(cid:455) just (cid:862)purple (cid:271)a(cid:272)teria(cid:863: thought to be phototrophic, but we know now that they include other metabolisms, epsilon and delta classes have no phototrophic bacterial examples. Can undergo anoxygenic photosynthesis (cid:894)photos(cid:455)(cid:374)thesis that does(cid:374)"t produ(cid:272)e o(cid:895: splits some chemical (ie h2s) to harvest electrons with sunlight, makes pigments (bacteriochlorophylls and carotenoids, cartenoids are accessory pigments that help capture additional light energy. Found in a well-stratified lake column, or within surface sediments: low oxygen in the bottom, with sulfide floating towards the top & sunlight on the surface. Chromatium can be found in a winogradsky column. Green sulfur bacteria are also found in winogradsky columns (chlorobium: part of the chrloroflexi, not proteobacteria, they prefer the highest (higher than purple sulfur bacteria) concentrations of sulfur.
