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Photosynthesis in Microorganisms

Photosynthesis in Microorganisms. General, Archaen, Anoxygenic, and Oxygenic. General Photosynthesis. Types of Phototrophs – based on Carbon source for synthesis. Fundamentals of Photsynthetic Activity and Cell Arrangement. Highly folded inner membrane

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Photosynthesis in Microorganisms

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  1. Photosynthesis in Microorganisms General, Archaen, Anoxygenic, and Oxygenic

  2. General Photosynthesis

  3. Types of Phototrophs – based on Carbon source for synthesis

  4. Fundamentals of Photsynthetic Activity and Cell Arrangement • Highly folded inner membrane • Thylakoid, lamelle, tubes, vessicles, chlorosomes, grana • Pigments • Chlorophyll, bacteriochlorophyll, rhodopsin, carotenoid, phycobillins • Light reactions • electron transport, proton gradient, ATPase

  5. Fundamentals of Photsynthetic Activity and Cell Arrangement • Internal Space • Stroma, cytoplasm, carboxysome • CO2-Fixation • Calvin-Bensen Cycle, Reductive TCA cycle, glyoxylate pathway • Dark Reactions

  6. Modes or Styles of Photosynthesis • Archaean • Unique, simple • Anoxygenic • Various pigments: purple or green • H2S or H2 as electron donor • Oxygenic • Similar to plants and algae • H2O as electron donor

  7. Reducing Power? • Cyanobacteria, Algae, Plants • Electrons from H2O reduce NADP+ to NADPH • NADPH used in reduction of CO2 to Glucose

  8. Reducing Power? • Purple and green bacteria • Electrons from H2S (or H2) reduce NADP+ to NADPH • NADPH used in reduction of CO2 to Glucose

  9. Pigments • Small differences in Chemical structure • Properties • Magnesium • Porphoryn • Phytol • Large differences in light absorbed

  10. Carotenoids Chlorophyll

  11. Archaean Photosynthesis • Halophilic Bacteria • Salterns, sea-salt farms, Dead Sea, Great Salt Lake

  12. Archaean Photosynthesis • Halophilic Bacteria • Salterns, sea-salt farms, Dead Sea, Great Salt Lake • Bacteriorhodopsin • Examples • Halobacterium

  13. Anoxygenic Phototsynthesis • Ancient form of metabolism – predates oxygenic photosynthesis and aerobic respiration • Bacteria Designated by • Pigments – Purple or Green • Electron Donor – Sulfur or Non-sulfur • Cyclic Photophosphorylation

  14. Winogradsky Column

  15. Anoxygenic Photosynthetic Bacteria

  16. Anoxygenic Photosynthetic Bacteria

  17. Anoxygenic Photosynthetic Bacteria

  18. Anoxygenic Photosynthetic Bacteria

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