1. School of Materials
Science and Engineering and Department of
Nanobio Materials and Electronics, Gwangju Institute of Science and Technology, Gwangju, 500-712,
Korea
2. College
of Veterinary
Medicine, Chonnam National University, Gwang-ju, 500-757, Korea
3. Department of Chemistry, Chung-Ang University, 221 Heukseok-dong,
Dongiak-gu, Seoul 156-755, Korea