WuXi PharmaTech, Inc. has completed the expansion of its materials characterization testing facility in St. Paul, MN. The new lab will begin operations by the end of June.    The new 20,000-sq.-ft. lab will offer expanded capacity for existing services, such as particle identification and extractable/leachable testing, and its new service, dynamic light scattering for nanoparticle characterization. The expansion is designed to allow rapid scale-up of technologies to increase capacities for chemi...