Lithotrophic prokaryotes

Physiological group Energy source Oxidized end product Lithotrophic organism
methanogens H2 H2O Methanobacterium
hydrogen bacteria H2 H2O Alcaligenes, Pseudomonas
carboxydobacteria CO CO2 Rhodospirillum, Azotobacter
nitrifying bacteria* NH3 NO2 Nitrosomonas
nitrifying bacteria* NO2 NO3 Nitrobacter
sulfur oxidizers H2S or S SO4 Thiobacillus, Sulfolobus
iron bacteria Fe ++ Fe+++ Gallionella, Thiobacillus
* The overall process of nitrification, conversion of NO3 to NH3, requires a consortium of microorganisms.

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