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. Author manuscript; available in PMC: 2012 Aug 31.
Published in final edited form as: J Am Chem Soc. 2011 May 24;133(23):8798–8801. doi: 10.1021/ja201252e

Figure 4.

Figure 4

Confocal images of PANC-1 cells incubated with PSiNPs. A) Cells treated with 20 μg/ml of FITC-PSiNPs loaded with Hoechst 33342 at 37 °C. B) Same experiment conducted at 4 °C. No staining was observed after incubation at low temperature. C) and D) Competition tests: cells were treated with 20 μg/ml of FITC-PSiNPs loaded with Hoechst 33342 and C) 60μg/mL or D) 200μg/ml of plain PSiNPs at 37 °C.