Figure 3:

Uptake of quantum dots is increased in acutely-dissociated cells prepared from aged, compared with young, rats. Acutely dissociated cells were incubated in the presence or absence of negatively-charged, thioglycolic acid-capped cadmium-tellurium quantum dots (1 × 10⁻⁶M; 4–6 nm; emission wavelength of approximately 620 nm) for 15 minutes and uptake was assessed by FACS analysis. Representative dot plots indicated that the number of CD11b-positive cells, which were also positive for quantum dots, was greater in cells prepared from aged, compared with young, rats (a) and mean values indicated that the age-related change was significant (b; p < 0.05; student’s t-test for independent means).