1. Liquid Crystal Institute and Chemical Physics Interdisciplinary Program; Kent State University; Kent Ohio 44242
2. Department of Chemistry; University of Hull; Hull HU6 7RX United Kingdom
3. Department of Chemistry and Physical Chemistry; Martin Luther University Halle-Wittenberg; von-Danckelmann-Platz 4 Halle 06120 Germany
4. Institute of Anatomy; University of Bern; Baltzerstrasse 2, 3000 Bern 9 Switzerland
5. Diatome Ltd Switzerland; P.O. Box 557, CH-2501 Biel Switzerland
6. College of Science; South China Agricultural University; Guangzhou 510642 China