Chapter 2 Photosynthetic bacteria

摘要: Publisher Summary The high level of diversity among photosynthetic bacteria, including cyanobacteria, stands in contrast to the relative uniformity found chloroplasts eukaryotes. Photosynthetic bacteria convert light energy into chemical free energy. Most these belong five eubacterial groups, but some, halobacteria, archaebacteria. Although cyanobacteria are certainly eubacteria, they have unique and important ability evolve oxygen. All eubacteria contain photochemical reaction centers (RC), containing one or more chlorophyll molecules. Each center consists a primary electron donor P (bacteriochlorophyll), an initial acceptor I (bacteriochlorophyll bacteriopheophytin), secondary acceptors (Fe-S centers, quinones). Sometimes D (Cyt c ) is tightly bound RC. absorption cross-section single RC so small that it cannot trap fast enough drive organism's transport system up capacity. Light-harvesting complexes (LHC) exist enlarge effective for each Filamentous anoxygenic phototrophic grouped together on basis their distinctive filamentous morphology. Green sulfur unicellular organisms. While may form dense planktonic blooms anaerobic zones both freshwater saline aquatic habitats, rarely mat layers typical ChlorofEexus.