Fig. (7) Prolonged antibacterial activity of MHL coatings with ciprofloxacin. Zirconium dioxide beads coated with a 1:1 (w/w) mixture of MHL with ciprofloxacin were incubated for 7 days in LB medium with daily exchange of the medium. The medium was inoculated with luminescent P. aeruginosa and the luminescence of the cultures after 5 hrs incubation at 37°C is shown. The supernatants were incubated with beads coated with MHL (filled circles), ciprofloxacin (open circles), DMSO (open triangles) or a combination of ciprofloxacin with MHL (filled triangles).