FIG. 5.
Dark potentiometric redox titrations of the b-type cytochromes of the cytochrome bc1 complex and the cytochrome b6c1 complex produced by appropriate R. capsulatus strains. The experimental conditions were as described in Materials and Methods, and the amounts of materials were as for Fig. 6. The data obtained were fitted to three n = 1 Nernst equations, and the Em7 values thus derived are indicated. Eh values were measured versus the standard hydrogen electrode (SHE). Rel Abs, relative absorbance.