Nanosight has recently received their 100th purchase order for their unique nanoparticle tracking analysis system which counts individual particles in liquid. Professor Steffen Petersen of the University of Aalborg in Denmark has selected the Nanosight LM10 to study the build-up of multi-layered, targeted nanoparticle drug delivery systems. His particular attraction to the instrument is its ability to not just to size particles but to investigate the potential to provide information about an individual particles refractive index. Among the goals of the Petersen group is the construction of drug delivery vehicles around an iron oxide core that will enable the group to study how effective different targeting molecules are using magnetic resonance imaging (MRI) techniques.