1. Division of X-ray Physics, Department of Physical Sciences, P.O. Box 64, FI-00014 University of Helsinki, Helsinki, Finland, Laboratory of Forest Products Chemistry, Helsinki University of Technology, P.O. Box 6300, FI-02015 HUT, Finland, KCL Science and Consulting, P.O. Box 70, FI-02151 Espoo, Finland, Division of Plant Physiology, Department of Biosciences, P.O. Box 56, FI-00014 University of Helsinki, Helsinki, Finland, and Latvian State Institute of Wood Chemistry, 27 Dzerbenes Street, Riga LV1006,...