Cell viability of MCF-7 cells. Measured by (a) CellTiter-Blue assay and (b) trypan blue counting in response to different concentrations and incubation times of S- and L-MWCNTs. Cells were treated as described in the ‘Methods’ section, and data were expressed as mean ± standard errors. Experiments were performed for three times.
Liu et al. Nanoscale Research Letters 2012 7:361 doi:10.1186/1556-276X-7-361