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Fluorescence and bright field images of live HEK 293 normal kidney cells. (a) Bright field image of HEK 293 cells directly labelled by PbS-SA-biotin QD (3 × 10−5 M in PBS buffer) for 4 h. (b) Fluorescence image of HEK 293 cells directly labelled by PbS-SA-biotin QD (3 × 10−5 M in PBS buffer) for 4 h, green channel, scale bar 100 µm. (c) Fluorescence image of HEK 293 cells directly labelled by PbS-SA-biotin QD (3 × 10−5 M in PBS buffer) for 4 h, red channel, scale bar 100 µm.
