Figure 3

Image of a J774.A1 murine 'macrophage-like' cell, as observed via TEM. The macrophage cell was exposed to NH₂ PEG QDs for 2 h at 40 nM. Six different areas (Figure A-F) possibly containing QDs were recorded by TEM from one selected cell (Figure G). The squares A-F mark the selected area where ESI analysis (assessing the elements S and Cd) was subsequently performed in order to identify and define the presence of QDs. Scale bars A-F equate to 200 nm and G equates to 2 μm.