FIG. 4.
Growth (expressed as OD600; open symbols) and extracellular Mn(II)-oxidizing (MO) activity (closed symbols) of L. discophora SS-1. (A) Cells were grown in iron-limited medium (composition C), with cells grown in composition B as a control. (B) Cells were grown in two iron-limited media (compositions C and D). Media were as follows: composition B, 0.2 μM Fe/5.8 mM pyruvate (squares); composition C, 0.1 μM Fe/5.8 mM pyruvate (triangles); and composition D, 0.1 μM Fe/8.7 mM pyruvate (circles). The values for compositions B and D are means ± standard deviations for duplicate cultures. The values for composition C are means ± standard deviations for triplicate cultures.