See references below for related reading.6.1      Introduction6.1.1    the general problem of cell entry6.1.2    choosing modes of cell entry6.1.3    how does Nature do it? (biomimetics)6.2      Non-specific uptake mechanisms6.2.1    pinocytosis by all cells6.2.2    phagocytosis by some cells6.2.3    a recent study of Qdot NP uptake6.3      Nanoparticle uptake6.3.1    NP size matters6.3.2    NP shape matters6.3.3    NP agglomeration reduces uptake6.3.4    A sample study6.4      Receptor-mediated uptake6.4.1    Receptor mediated transport of desired molecules6.4.2    How to study uptake mechanisms by inhibiting pathways with specific drugs6.4.3    Some sample studies6.5      Effects of nanoparticle coatings6.5.1    Acrylate-Facilitated Cellular Uptake6.5.2    Polyethyleneimine Coating Enhancement of Cellular Uptake6.6      Effects of microenvironment and external stimuli