Figure 3. Time course of the Mn(II)-oxidizing activities and the cell growth of several isolates from A-, B-, and C-layer soils.

The cells were grown in liquor K medium for 144(OD₆₀₀) and the concentration of Mn oxides were determined according to the procedures described in the “Materials and Methods” section. (○) Optical density of the cells (at 600 nm); (▪) Concentration of Mn oxides; (□) pH. A: Non-Mn(II)-oxidizing E. coli JM109 (as the negative control). B: A86. C: A101. D: B84. E: C19. F: C13.