1. Division of Biosystems Research, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-806, Korea
2. College of Environmental and Bioresource Sciences, Chonbuk National University, Jeonju 561-756, Korea
3. Chemical Biotechnology Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
4. Department of Food Science and Technology, Kyungpook National University, Daegu 702-701, Korea