Figure 4

(a) Typical TP images of P-QD-treated HepG2 after different time intervals 800 nm femtosecond laser illumination.
For comparison, the TP images of Hoechst 33342 and Green Fluorescent Protein (GFP) under the same conditions are shown. (b) The intensity of P-QD as a function of illumination time. For comparison, the fluorescence decay curves of Hoechst 33342 and Green Fluorescent Protein (GFP) under the same conditions are shown.