Chemoautotroph: Bacteria Electron Electron Products donor acceptor Alcaligens and O H2O Pseudomonas sp Nitrobacter NO2- O NO3. H2O Nitrosomonas THat O NO2" H2O Desulfovibrio SO42 H20. h2S Thiobacillus denitrificans So H2S NO3 SO42N Thiobacillus ferrooxidans Fe O Fe3+ H2o Nitrifying bacteria 2NH4++302 2 NO2-+2 H20+4 H++ 132 KcalChemoautotroph: Nitrifying bacteria 2 NH4 + + 3 O2 2 NO2- + 2 H2O + 4 H+ + 132 Kcal Bacteria Electron donor Electron acceptor Products Alcaligens and Pseudomonas sp. H2 O2 H2O Nitrobacter NO2 - O2 NO3 - , H2O Nitrosomonas NH4 + O2 NO2 - , H2O Desulfovibrio H2 SO4 2- H2O. H2S Thiobacillus denitrificans S0 . H2S NO3 - SO4 2- , N2 Thiobacillus ferrooxidans Fe 2+ O2 Fe 3+ , H2O