1. The Dow Chemical Company, 2301 N. Brazosport Blvd. Freeport, Texas 77541 (L.D.L., J.D.T., M.B.S.); Los Gatos Research Incorporated, 67 E. Evelyn Avenue, St. 3, Mt. View, California 94041 (M.G., T.O., D.B.); and Analytical Specialties Incorporated, 910 Gemini, Houston, Texas 77058 (T.K., A.C., J.Z.)