Biological influence of QDs on J774A.1 cells. (A) Bright field images of J774A.1 cells treated with QDs with different surface modifications at 47 μg/ml for 5 days (×40). (B) The bar graph represents the relative cellular flat surface area of J774A.1 cells treated with 47 μg/ml QDs coated with PEG-NH2 for 5 days (n = 50). (C) Cell proliferation was evaluated with the BrdU incorporation assay upon treatment with 47 μg/ml QDs with different surface modifications for 24 h (n = 6). Asterisk indicates P < 0.001.
Qu et al. Nanoscale Research Letters 2013 8:198 doi:10.1186/1556-276X-8-198