1. Department of Chemistry, National Central University, Chung-Li, Taiwan 32054, R.O.C., Department of Neurological Surgery, Tri-Service General Hospital, National Defense Medical Center, 325, Sec. 2, Cheng-Kung Rd, Nei-Hu Dist, Taipei 11490, Taiwan, R.O.C., Department of Chemical and Materials Engineering, National Central University, Chung-Li, Taiwan 32054, R.O.C.