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Hg 0 Hg 2+ CH 3 Hg + (CH 3 ) 2 Hg

Microbial transformations of mercury in the environment. lipophilic. [CH 3 - ]. 2e -. [CH 3 - ]. Hg 0 Hg 2+ CH 3 Hg + (CH 3 ) 2 Hg. HS -, - S-R. HgS, Hg + -S-R. Algae. Fish. Children. Women. Infants. Fetus. Minnamata Bay. Hg 2+ , Hg 0.

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Hg 0 Hg 2+ CH 3 Hg + (CH 3 ) 2 Hg

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  1. Microbial transformations of mercury in the environment lipophilic [CH3-] 2e- [CH3-] Hg0 Hg2+ CH3Hg+ (CH3)2Hg HS-,-S-R HgS, Hg+-S-R Algae Fish Children Women Infants Fetus

  2. Minnamata Bay Hg2+, Hg0 CH3-Hg+, (CH3)2Hg Anoxic sediment Pathology: constricted visual field, impairment of vibration sense, total blindness, ataxia, necrosis of Glia cells

  3. “Life is Redox Chemistry” AH2 + B A + BH2 DG<0 Energy DG= -nFDE, DE= Eacceptor - Edonor

  4. SO42- Carbon and electron flow in sulfidogenic environments Complex organic matter Carbohydrates, nucleic acids proteins, lipids 1 Lactate Propionate Higher fatty acids Alcohols Aromatic compounds H2, CO2 Acetate 2 H2S, CO2 1 = fermentative bacteria, e.g., lactic acid bacteria, clostridia, enteric bacteria, propionibacteria 2 = sulfate-reducing bacteria, e.g., Desulfovibrio spp, Desulfobacterium spp, Desulfobacter spp, Desulfotomaculum spp.

  5. Carbon and electron flow in methanogenic environments Complex organic matter Carbohydrates, nucleic acids proteins, lipids 1 Lactate Propionate Higher fatty acids Alcohols Aromatic compounds 2 H2, CO2 3 Acetate 4 CH4, CO2 1 = fermentative bacteria, e.g., lactic acid bacteria, clostridia, enteric bacteria, propionibacteria 2 = proton-reducing, syntrophic bacteria, e.g., Syntrophomonas spp, Syntrophobacter 3 = homoacetogenic bacteria, e.g., Acetobacterium woodii, Clostrodium aceticum 4 = methanogenic archaea, e.g., Methanosarcina spp, Methanobacterium spp., Methanospirillum spp.

  6. SO42- Carbon and electron flow in sulfidogenic environments Complex organic matter Carbohydrates, nucleic acids proteins, lipids 1 Lactate Propionate Higher fatty acids Alcohols Aromatic compounds H2, CO2 Acetate 2 H2S, CO2 1 = fermentative bacteria, e.g., lactic acid bacteria, clostridia, enteric bacteria, propionibacteria 2 = sulfate-reducing bacteria, e.g., Desulfovibrio spp, Desulfobacterium spp, Desulfobacter spp, Desulfotomaculum spp.

  7. Oxidative carbon monoxide pathway in Sulfate-reducing bacteria

  8. Mercury in the environment lipophilic [CH3-] 2e- [CH3-] Hg0 Hg2+ CH3Hg+ (CH3)2Hg HS-,-S-R HgS, Hg+-S-R Algae Fish Children Women Infants Fetus

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