1. Division
of Forest and Biomaterials Science, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
2. Centre
de Recherches sur les Macromolecules Vegetales (Affiliated with Joseph
Fourier University of Grenoble), CNRS, B.P. 53, 38401, Grenoble Cedex 9, France