1. Biophysical Chemistry II, Institute of Physical Chemistry and BIOQUANT, University of Heidelberg, 69120 Heidelberg, Germany
2. Department of Molecular and Cellular Biology, University of Guelph, Ontario, Canada
3. Biophysics Interdepartmental Group, University of Guelph, Ontario, Canada
4. Advanced Foods and Materials Network of Centres of Excellence, Canada
5. Department of Physics, St Francis Xavier University, Antigonish NS B2G 2W5, Canada
6. European Synchrotron Radiation Facility (ESRF), 38053 Grenoble, Cedex 9, France