1. Department of Physics, Faculty of Science, Shizuoka University, 836 Oya, Shizuoka, 422, Japan, Departamento de Ciencias Experimentales, Universidad Jaume I, 12080 Castellón, Spain, Institute of Plant Physiology, Russian Academy of Sciences, Botanicheskaya 35, 127276 Moscow, Russia, and Dept Quimica, Faculdade de Ciencias e Tecnologia, Universidade Nova de Lisboa, 2825, Monte de Caparica, Portugal