1. Ph.D. Student, Dept. of Civil Engineering and Mechanics, Univ. of Wisconsin, Milwaukee, WI 53201.
2. Associate Professor, Dept. of Geosciences, Univ. of Wisconsin, Milwaukee, WI 53201.
3. Postdoctoral Researcher, Dept. of Biological Sciences, Univ. of Wisconsin, Milwaukee, WI 53201; presently, Division of Plant Sciences, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki 305-8602, Japan.
4. Associate Professor, Dept. of Biological Sciences, Univ. of Wisconsin, Milwaukee, WI 53201.
5. Associate Professor, Dept. of Civil Eng. and Mechanics, Univ. of Wisconsin, Milwaukee, WI 53201 (corresponding author).