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Speciation of soluble iron in cultures of S. acidophilus YTF1 grown under microaerobic conditions in media (pH 2.0) containing 10 mM glycerol and 0.02% (wt/vol) yeast extract and supplemented with 0.1% (wt/vol) amorphous ferric hydroxide (a), 0.1% (wt/vol) jarosite (b), or 0.1% (wt/vol) goethite (c). Symbols: •, total iron; ▵, ferrous iron; ○, ferric iron.
