Figure 6
Scanning electron microscopy of Salmonella Enteritidis (393) forming small colony variants (SCV) and wild-type-like phenotype colonies after exposure to 100-fold MIC of ciprofloxacin for 72 h. In cells from both (A,B,E,F) wild-type-like phenotype and (C,D,G,H) SCV derived from (A–D) planktonic and (E–H) biofilm cultures were observed septum division (insets), (B,D,F,H) filamentation, and similar size between wild-type-like phenotype and SCV (A) (1.129–1.155 µm), (C) (1.285–1327 µm), (E) (1.057–1.041 µm) and (G) (1.275–1.158 µm). (C,D) White arrow indicates the extracellular substance in SCVs obtained from planktonic culture and black arrows indicate septum division.
