The MTT (% of control) evaluated after exposed to three kinds of GQDs for 24 h. (a) MTT (% of control) of A549 cells after exposed to different concentrations of three kinds of GQDs. (b) MTT (% of control) of C6 after the exposure to three kinds of GQDs at different concentrations. Asterisk indicated p < 0.05 and double asterisk represented p < 0.01.
Yuan et al. Nanoscale Research Letters 2014 9:108 doi:10.1186/1556-276X-9-108