Fig. 4.

Time-resolved UV-vis absorption spectral measurements of Mn(III) oxidation by exosporium at room temperature. (a) Selected UV-vis absorption spectra of the reaction mixture taken at the indicated time points during Mn(III) oxidation. The growth of the 400 nm band indicates formation of the particulate Mn oxides. (b) Time courses followed by Mn(III)-pyrophosphate and MnO₂ species during the 30 h UV-vis absorption experiment and obtained from the fit of the absorption spectrum at each time point to a linear combination of the component spectra depicted in Fig. 2