Li et al. Nanoscale Res Lett 2011, 6:29 http://www.nanoscalereslett.com/content/6/1/29 Page 4 of 8 Figure 2 Typical AFM images of nano PLA/Au polymer nanofibers (a) and PLA/Au nanocomposites conjugated with daunorubicin (3.30 × 10-4 M) (b). Z Scale: 200 nm. Figure 3 Optical microscopy images of leukemia cancer cells. a K562 cells, c K562 treated with DNR, e K562 treated with DNR conjugated with PLA/Au nanocomposites (DNR was 1 × 10-6 M in the above systems); b K562/AO2 cells, d K562/AO2 treated with DNR, f K562/AO2 treated with DNR conjugated with PLA/Au nanocomposites (DNR was 1 × 10-6 M in the above systems).