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. 1999 Dec;65(12):5285–5292. doi: 10.1128/aem.65.12.5285-5292.1999

FIG. 6.

FIG. 6

Comparison of bacterial and chemical surfaces after 69 h of leaching. A SEM preparation technique was used to minimize sample dehydration. (A) Surface of bacterially leached sample, indicating large amounts of attachment of rod-shaped T. ferrooxidans. (B) Surface of chemically leached sample, indicating the presence of sulfur, as seen in Fig. 5B. Conditions: Fe3+ concentration, 1.0 g/liter; Fe2+ concentration, 8.0 g/liter; density of solids, 5 g/liter; temperature, 35°C; pH, 1.6; O2 concentration, 5.9 mg/liter.