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| Figure 3: Labeling of U87 cells using QDs655-Tf. (A) Phase contrast and fluorescent images of NHA and U87 cells after treatment with QDs655-Tf. The red fluorescence could be detected only in the condition of labeling using QDs655-Tf. The white bar indicates 100 µm. (B) The labeling efficiency of QDs655 and QDs655- Tf for U87 cells using a flow cytometry analysis. (C) A graph of the labeling efficiency of QDs655 and QDs655-Tf in the U87 cells. (D) Observation of the internalization of QDs655-Tf in the NHA (a) and U87 cells (b) using confocal laser scanning microscopy. The white bar indicates 25 µm. |
