Medical scientists have known for some time that gold nanoparticles, coated with a thin layer of a special polymer, are an effective way of delivering drugs, nutrients, or biosensors into cells without damaging or destroying the cell. But researchers have been puzzled as to why this combination works so well or how it made it through the difficult-to-penetrate membrane walls.

China's huge population of mobile users is awakening to the value and effectiveness of mobile health solutions. Mobile health or mHealth uses mobile devices, often smartphones or tablets, to deliver health-related services. Mobile health solution can both improve health outcomes and lower costs for providers.