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Cycling of iron by a mixed culture of At. ferrooxidans and Acidiphilium SJH. The culture medium (pH 2.0) contained (initially) 25 mM ferrous sulfate and 10 mM glycerol, and was maintained at 30°C under controlled aeration. Ferrous iron concentrations are shown in red and concentrations of dissolved oxygen in blue (modified from Johnson et al., 1993).
