Imagine the sign on the door: “California NanoSystems Institute: Nano Machine Center for Targeted Delivery and On-Demand Release.”  This must not be a same ol’ day-at-the-office place. What they do is make mesoporous silica nanoparticles (“MSNs”) that can be impregnated with anticancer drugs, delivered directly to a tumor, and then retrieved from urine and feces without their drug load. Researchers at this UCLA facility imagine that MSNs might also be designed with nano-valves for controlled drug release.    MORE