Fig. 7From: Label-free cell based impedance measurements of ZnO nanoparticles—human lung cell interaction: a comparison with MTT, NR, Trypan blue and cloning efficiency assaysEffects of ZnO NPs treatment for 48 h on the microtubule architecture and on the morphology of A549 cells. Confocal microscopy analysis and scanning electron microscopy observations. a Control cells. b Cells treated with 1, μg/cm2 ZnO NPs. c Cells treated with 5 μg/cm2 ZnO NPs. d Cells treated with 20 μg/cm2 ZnO NPsBack to article page