FIG. 6.
Growth (expressed as OD600; open symbols) and extracellular Mn(II)-oxidizing factor (MOF) activity (closed symbols) of L. discophora SS-1 in iron-limited media supplemented with 0.02 and 0.04 μM Cu(II). Media were as follows: 0.1 μM Fe/5.8 mM pyruvate (composition C; squares), composition C with 0.02 μM Cu(II) (triangles), and composition C with 0.04 μM Cu(II) (circles). The values for composition C with 0.02 μM Cu(II) are means ± standard deviations for triplicate cultures. The values for composition C and composition C with 0.04 μM Cu(II) are means ± standard deviations for duplicate cultures.