1. Department of Biotechnology, Norwegian University of Science and Technology, N-7491 Trondheim, Norway, RMN Biomoléculaire, Unité mixte de Recherche, Université Claude BernardLyon 1, CNRS Sciences Analytiques, ESCPE, Lyon, F-69622 Villeurbanne, France, and Department of Biotechnology, SINTEF Materials and Chemistry, N-7034 Trondheim, Norway