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. Author manuscript; available in PMC: 2010 Nov 10.
Published in final edited form as: Geochim Cosmochim Acta. 2010 May 10;74(10):2826–2842. doi: 10.1016/j.gca.2010.02.017

Fig. 1.

Fig. 1

Comparison of scanning electron micrographs of circum-neutral pH Fe(II)-oxidizing bacteria. A) Nitrate-reducing Fe(II)-oxidizing Acidovorax sp. strain BoFeN1 cells heavily encrusted in iron(III) (hydr)oxides (black arrow) plus extracellular Fe(III) mineral precipitates (filaments – white arrow). B) Phototrophic Fe(II)-oxidizer Thiodictyon sp. strain F4 (black arrow) associated with, but not encrusted in iron(III) (hydr)oxides (white arrow). Thiodictyon sp. strain F4 was used in the Fe-isotope study of phototrophic Fe(II)-oxidizers by Croal et al. (2004).