1. Norwegian Biopolymer Laboratory (NOBIPOL), Department of Biotechnology, University of Trondheim, NTH, N-7034 Trondheim, Norway, Max Planck Institute for Colloid and Interface Science, D-14513 Teltow, Germany, and Department of Applied Biochemistry and Food Science, University of Nottingham, Sutton Bonington LE12 5RD, U.K.