Figure 1. Electron micrograph of C. beijerinckii cells grown on P2 medium with and without CaCO₃.

WT-8052 strain cultured at 12 h (A) and 24 h (B); DG-8052 strain at 12 h (C) and 24 h (D); DG-8052 cells strain cultured with 4 g/L CaCO₃ at 12 h (E) and 24 h (F). The typical cells were indicated by yellow arrows.