1. School of Biological Sciences; Univ. of Hong Kong; Pokfulam Rd. Hong Kong
2. Dept. of Bioclinical Sciences; Faculty of Dentistry; P.O. Box 24923, Safat 13110, Kuwait Univ Kuwait
3. Faculty of Agricultural Sciences; Sabaragamuwa Univ. of Sri Lanka; P.O. Box 02 Belihuloya Sri Lanka
4. Glyn O. Philips Hydrocolloid Research Centre at HUT; Hubei Univ. of Technology; Wuhan 430068 China