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Time-dependent uptake of QD/SR9. QDs were premixed with SR9 at a molecular ratio of 1 : 20. A549 cells were treated with QD/SR9 at 150 nM QD concentration for 5 min, 20 min, 40 min, 1 hour, and 3 hours. Values are mean ± SD from three independent experiments. Fluorescence intensity is normalized relative to the value at 5 min. *P < .01 versus 5 min; αP < .01 versus 20 min; βP < .01 versus 40 min.
