FIG. 6.

Electron micrographs of the NGR234 surface appendages. Transmission electron micrographs showing flagella, pili, and other filaments of negatively stained cells of noninduced cultures of NGR234 (A) and apigenin-induced cultures of NGR234 (B), NGRΩrhcN (C), and NGRnopB::uidA (D). The flagella are marked with arrowheads, while the pilus-like structures are marked with white arrows. The bacterial cells were grown in YEM on carbon-Formvar-coated gold grids at 28°C and stained with 1% phosphotungstate. Scale bar, 1 μm.