FIG. 6.
Ability of 2% Triton X-100 in the presence of 10 mM MgCl2 to solubilize the cytochromes of various membrane fractions isolated from anaerobically grown cells of MR-1 and MTRB1. The Triton X-100-insoluble material was pelleted by ultracentrifugation and analyzed spectrally to determine cytochrome content. The values are the percentages of total cytochromes associated with the post-Triton X-100 pellet relative to the amounts in the Triton X-100-free controls. All values are means ± standard deviations (n = 2) for independent subcellular fractions from each strain. A section sign indicates that the value is statistically significantly different from the value for MR-1 at a P value of <0.001.