28874D

28874D
;Caption: Purple nonsulfur bacterium Rhodobacter ferrooxidans. Rhodobacter ferrooxidans is a rod shaped, anoxygenic photosynthethic prokaryote (bacterium) that is also capable of oxidizing iron / Fe (II) to iron / Fe (III), which then hydrolyzes to iron hydroxide (FeOH3). Modern-day photoautotrophic bacteria oxidize Fe(II) and use light energy for CO2 fixation. Seen here are rod shaped, R. ferrooxidans bacteria surrounded by crystalline iron hydroxide mineral phases. These organisms can significantly affect the geochemistry of the Earth's near surface environments. The acidophilic Fe(II) oxidizing bacteria and archaea play an important role in promoting acid mine drainage and neutrophilic Fe(II) oxidizing bacteria appear to contribute to the alteration of marine sediments.
Magnification*: x3.400
Type: SEM
Copyright 2008 Dennis Kunkel Microscopy, Inc.
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