Figure 11.

Luminescent intensities in excess of the background from the control (HeLa, no SiQDs present) measured using flow cytometry (excitation 355 nm, emission 675 nm) for cells treated with 50 or 100 $\mathsf{\mu }$g mL${}^{-1}$ SiQD for 24 h. The values reported are normalized to the intensity for HeLa treated with 50 $\mathsf{\mu }$g mL${}^{-1}$ SiQD for 24 h. Bars are means ± SD for n = 3 experiments.