Figure 4

TEM images of an A. baumannii bacterium grown in solution with or without C6-HSL. TEM images were captured at magnification of ×12,000 (left column) and at ×15,000 (right column). (a) 12, 000-power magnification and (b) 15,000-power magnification of bacterial cell grown on glass slips incubated in MH broth without shaking over night at 37°C. (c) 12,000-power magnification and (d) 15,000-power magnification of bacteria cell growth in MH with 100 μmol/L C6-HSL forms obvious pili-like structures.