FIG. 1.

(A) Transmission electron micrographs of the wild-type and Δppk1 mutant C. jejuni strains. The TEM sections show large, distinct poly-P granules (arrows) in the wild type but not in the Δppk1 mutant, as observed with other bacteria (46, 65). Representative images are shown. Bars, 200 nm. (B) Growth curves of the wild-type, Δppk1, and Δppk1c strains. The growth curves were assessed by growing the bacteria in MH broth and direct plating on MH agar in triplicate or by measuring the OD₆₀₀ at different time points. Data represent the mean ± SE of two independent experiments. WT, wild type.