1. Physical Chemistry 1, Centre for Chemistry and Chemical Engineering, University of Lund, S-221 00 Lund, Sweden, Departamento de Química, Universidade de Coimbra, Rua Larga, 3004-535 Coimbra, Portugal, Department of Biological Chemistry, Centre for Advanced Materials, Indian Association for the Cultivation of Science, Jadavpur, Kolkata - 700032, India, and Institute for Genomics and Integrative Biology, CSIR, Mall Road, Delhi 110 007