1. School of Biological Sciences; Universiti Sains Malaysia; 11800 Penang Malaysia
2. Biotechnology, Center for Chemistry and Chemical Engineering; Lund University; P.O. Box 124 SE-22100 Lund Sweden
3. School of Chemical Sciences; Universiti Sains Malaysia; 11800 Penang Malaysia
4. Department of Bioengineering, Graduate School of Bioscience and Biotechnology; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8501 Japan