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Importance of iron(III) ions for the onset of pyrite dissolution (bioleaching) by cells of T. ferrooxidans. Pyrite dissolution was measured before (A) and after (B) inoculation with EPS-deficient cells as an increase of total iron concentration in the medium (triangles) and heat output on the substratum (bars). Asterisks show the cell concentration of planktonic bacteria. The arrow indicates the addition of 0.5 g of iron(III) ions per liter. d, days.
