Silicon Dioxide - chemistry, Nanoparticles - ultrastructure, Nanoparticles - chemistry, Neoplasms - diagnosis, Sulfides - chemistry, Lead - chemistry, Fluorescein-5-isothiocyanate - chemistry, Streptavidin - chemistry, Streptavidin - metabolism, Nanoparticles - diagnostic use, Amines - chemistry, Biotin - chemistry