FIG. 3.

Effects of diospyrin (circles), diospyrin dimethylether (squares), and diospyrin dimethylether hydroquinone (triangles). Purified organisms were incubated with [U-¹⁴C]PHBA for 2 days in the presence of different concentrations of a compound. Values represent means ± standard errors of the means for three or six separate experiments. Inhibition of ubiquinone biosynthesis was not observed at concentrations of these naphthoquinone drugs up to 100 μM.