Fig. 6

Young’s modulus differences between untreated cells and cells exposed to MWCNTs and GFs. The elastic Young’s modulus of fibroblast cells after exposure to GFs significantly decreases by ~ 20% than the control cells, whereas cells exposed to MWCNTs decreased ~ 10%. The force/volume measurements were done at least 22 points per cell. Each group of measurements includes 13 cells. Significant at p < 0.05 by t-test