Figure 5. Amino acid modification changed the speed of QDs entering blood cells and their effect on apoptosis of blood cells.

0.56 nM of CdTe QDs was administered via oral injection; water was injected as a negative control. (a) Merged images for bright field and fluorescent light, revealing blood cells with accumulated QDs 12 h and 24 h after exposure. (b) The percentage of positive blood cells with QDs characteristic fluorescence in total blood cells at 12 h and 24 h after exposure. (c) Positive rate of PI staining of blood cells, indicating apoptosis of blood cells. The labels indicate: FL, fluorescent light; BF, bright field; BF + FL, merged images for bright field and fluorescent light, showing blood cells with accumulated QDs530. *P < 0.05 and **P < 0.01 indicate significant differences (n = 3). Bars are 10 μm.