1. Interdisciplinary Program of Bioengineering; School of Chemical and Biological Engineering; Seoul National University; Seoul 151-742 Korea
2. Korea Research Institute of Chemical Technology; Daejeon; 305-600 Korea
3. Department of Chemical Engineering; Kwangwoon University; Seoul 139-701 Korea
4. Department of Chemical Engineering and Applied Chemistry; University of Toronto; Toronto M5S 3ES Ontario Canada