Figure 17.2 16S rRNA Gene Tree of Proteobacteria Proteobacterial Classes Bacillus Nitrosococcus Thermochromatium Acidithiobacillus Beggiatoa Gamma Pseudomonas Vibrio Escherichia Methylobacter Gallionella Nitrosomonas Methylophilus Derxia Ralstonia Beta Spirillum Rhodocyclus -Thiobacillus Neisseria Methylobacterium Nitrobacter Rhodopseudomonas Beijerinckia Alpha Paracoccus Azotobacter Rickettsia Acetobacter Mariprofundus I Zeta Campylobacter Sulfurimonas Epsilon Thiovulum Wolinella Desulfosarcina Desulfovibrio Delta Myxococcus Nitrospina Major metabolisms Chemolithotrophy Anoxygenic phototrophy Sulfur compounds(H2s,s°，etc) Methylotrophy Ferrous iron(Fe2+) Sulfate reduction Ammonia(NH3)or nitrite(NO2) Nitrogen fixation Hydrogen(H2) 2012 Pearson Education,IncFigure 17.2 16S rRNA Gene Tree of Proteobacteria Proteobacterial Classes Major metabolisms Chemolithotrophy Bacillus Nitrosococcus Thermochromatium Acidithiobacillus Beggiatoa Pseudomonas Vibrio Escherichia Gamma Methylobacter Gallionella Nitrosomonas Methylophilus Derxia Ralstonia Beta Spirillum Rhodocyclus Thiobacillus Neisseria Methylobacterium Nitrobacter Rhodopseudomonas Beijerinckia Alpha Paracoccus Azotobacter Rickettsia Acetobacter Mariprofundus Campylobacter Zeta Sulfurimonas Thiovulum Epsilon Wolinella Desulfosarcina Desulfovibrio Delta Myxococcus Nitrospina Anoxygenic phototrophy Nitrogen fixation Sulfate reduction Methylotrophy Sulfur compounds (H2S, S0 , etc.) Ferrous iron (Fe2 ) Ammonia (NH3 ) or nitrite (NO2  ) Hydrogen (H2 ) © 2012 Pearson Education, Inc