carbon fixation pathways and taxonomic energy patterns.txt

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Author:
rincrocci
ID:
110047
Filename:
carbon fixation pathways and taxonomic energy patterns.txt
Updated:
2011-10-18 20:27:29
Tags:
carb fixation
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Description:
carbon fixation
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  1. 1. Reductive-PENTOSE phosphate (Calvin-Benson-Bassham) *
    • Carbon fixation pathway occurring in Cyanobacteria, Diderm Eubacteria (Gram - w/DS membrane), Plants & green algae
    • 1 mole of CO2 + 5-carbohydrate sugar (6 c's total) --> hydrolyzed into 2 molecules of 3-Carbon Phosphoglycerol (G3P)..(6 c's total again)
  2. 2. Reductive Citric Acid Cycle (Reverse Krebs)
    • Ancient pathway, from seafloor
    • Anabolic pathway produces 5-carbon alpha ketoglutamate
    • Found in crenarchaeota (no histones or cell wall, mono & diderm eubac
  3. 3. Reductive Acetyl-CoA Pathway
    • Ancient pathway
    • ONLY Anaerobic (sensitive to O2)
    • Co2 --> Acetyl CoA by CO2 + H2 & then methylating CO
    • Occurs in Euryarchaeota, mono & diderm Eubac
  4. Remaining 3 carbon fixation pathways:
    • 4. 3-hydroxypropionate bicycle (in diderm eubac..ie - Chloroflexus aurantiacus)
    • 5. dicarboxylate/4-hydroxybutyrate cycle (in Crenarchaeota..ie - Desulfurococcus mobilis)
    • 6. modified 3-hydroxypropionate/4-hydroxybutyrate cycle (in Crenarchaeota..ie - Sulfodobus saltatarians)
  5. Prior to Heavy Bombardment Period
    • Strongly reductive atmosphere
    • H20, CH4, NH3, H2
  6. During Heavy Bombardment
    • 4Bil years ago
    • Slightly reducing
    • CO2, H20, CO, N2
  7. After Heavy Bombardment
    • 3.8Bil yr ago
    • Mod. reducting
    • CO2, H20, CO, N2 PLUS CH4 & H2
  8. After OCEAN loss of Fe2+
    • 2.2Bil yr ago
    • Microaerophilic (min oxy req)
    • CO2, H20, N2, CH4, and ...O2
  9. After O2 stabilization
    • 1bil yr ago
    • Strongly OXIDIZING
    • N2, O2, H20, CO2
  10. Chemoautotrophy
    • Use of Chem. for energy and INORGANIC carbon sources
    • Found in Crenarchaeota, Euryarchaeota, Mono & Diderm Eubacteria
  11. ChemoHeterotrophy
    • Use of Chem. for energy and ORGANIC carbon sources
    • Found in Crenarchaeota, Euryarchaeota, Mono (Bac. subtilis) & Diderm (E. coli) Eubacteria, Protista, Plant, fungus & Animal
  12. Photoautotrophy
    • Use of Sunlight for ENERGY and INORGANIC carbon sources
    • Found in Diderm Eubacteria (chlorobium limicola), Protista (Chlorella vulgaris) & Plantae (Arabidopsis thaliana)
  13. PhotoHeterotrophy
    • Use of Sunlight for ENERGY and ORGANIC Carbon sources
    • Found in Euryarchaeota, Diderm eubacteria, Protista, plantae & Animalia
    • ex of animalia: Elysia chlorotra uses chloroplasts from algae when it eats it and then gets energy from sun

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