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| Figure 4: Concentration dependency and cytotoxicity of QDs655-Tf in labeling U87 cells. (A) Phase and fluorescent images of U87 cells labeled with QDs655-Tf at various concentrations (0, 0.01, 0.1, 0.5 and 1.0 nM). The white bar indicates 100 μm. (B) The relative fluorescent intensity of U87 cells labeled with QDs655-Tf. (C) The survival rates of U87 cells labeled with QDs655-Tf at various concentrations (0, 0.01, 0.1, 0.5 and 1.0 nM). No significant differences were observed between the concentrations. |
