1. Department of Aerospace and Mechanical Engineering, P.O. Box 210119, Department of Pharmacology and Toxicology, University of Arizona, 1703 East Mabel Street, and Biomedical Engineering and Bio5 Institute, University of Arizona, Tucson, Arizona 85721, Department of Urology, Stanford University, 300 Pasteur Drive, S-287, Stanford, California 94305-5118, and GeneFluidics Inc., 2540 Corporate Place, Suite B-101, Monterey Park, California 91754