1. Division of Applied Microbiology, National Institute of Agricultural Science and Technology, R.D.A., Suwon 441-707, Korea.
2. Division of Agriproduct Science, National Institute of Agricultural Science and Technology, R.D.A., Suwon 441-707, Korea.
3. Department of Environmental Biology, Kwangwon National University, Kwangwon 360-763, Korea.