Figure 4

SEM images of S. obliquus exposed to (A) and (B) 40 mg·L−1 CNTs, (C) and (D) 60 mg·L−1 nano Fe2O3, (E) and (F) 40 mg·L−1 nano MgO for 96 h. Yellow arrows indicate the aggregates formed on by nanoparticles. Red arrows indicate the fracture sections of detached flagellums left on cell surface.