Fig. 2

Bacteria on enamelo-cemental junction of rats’ teeth detected by scanning electron microscopy. a: P. gingivalis W83 alone; b: P. gingivalis W83 plus 6.25 μg/mL of Nal-P-113; c: P. gingivalis W83 plus 25 μg/mL of Nal-P-113; d: P. gingivalis W83 plus 100 μg/mL of Nal-P-113; e: P. gingivalis W83 plus 400 μg/mL of Nal-P-113; f: control group, without P. gingivalis W83 or Nal-P-113. SEM magnification, 20,000×. Red arrows indicate P. gingivalis W83; white arrows indicate Coccus, a genus of resident bacteria in the rat oral cavity; yellow arrows indicate the rat tooth surface