1- Professor Bahruddin Saad: School of Chemical Sciences, University Sciences Malaysia, 11800 Penang, Malaysia, e-mail: bahrud@usm.my

2- Professor Oliver J. Schmitz: Institute of Applied Analytical Chemistry,

S07 T01 B35,Universität sstr. 5-7, 45141 Essen, Email: oliver.schmitz@uni-due.de , Phone: +49 (0) 201 183-3950, Fax:      +49 (0) 201 183-3951,

3- Professor Fakhr Eldin O. Suliman: Department of Chemistry, College of Science, Sultan Qaboos University, Box 36, Al Khod 123, Oman, e-mail: fsuliman@squ.edu.om, Phone:00968-99242937

4- Professor Hassan Y. Aboul-Enein:Pharmaceutical and Medicinal Chemistry Department, National Research Centre, Tahrir Street, Dokki, Cairo 12311, Egypt, e-mail: haboulenein@yahoo.com, Phone. 0103678948, H/P 0020103678948