1. Department of Forestry , National Chung-Hsing University , Taichung 402 , Taiwan
2. Taiwan Forestry Research Institute , Taipei 10066 , Taiwan
3. Graduate Institute of Chinese Pharmaceutical Science, China Medical University , Taichung , Taiwan
4. Department of Biotechnology , Asia University , Taichung , Taiwan
5. Department of Forestry , National Chung-Hsing University , Taichung 402 , Taiwan , Phone: +886-22840345, ext-147