QDs localization and accumulation in the liver of Carassius gibelio is highlighted by fluorescence microscopy. When excited in UV, the DAPI-stained nuclei appear blue, while the Si/SiO2 QDs appear red due to their intrinsic fluorescence. (A) Liver tissue from control (non-injected) animals. QDs are visible in the hepatocytes at 24 h (B), 72 h (C), and 7 days (D) after IP injection (arrows).
Stanca et al. Nanoscale Research Letters 2013 8:254 doi:10.1186/1556-276X-8-254