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Apparent absorbance spectra of intact L. ferrooxidans collected in the CLARiTY in the absence (a) and presence (b) of 100 mM ferrous sulfate in aerobic sulfuric acid, pH 1.7. The final bacterial suspension contained 2.1 × 109 cells of L. ferrooxidans in 4.2 ml. Curve c shows the apparent absorbance spectrum of 50 μM ferric ions under the same solution conditions in the absence of bacteria.
