1. The School of Chemical, Biological and Environmental Engineering, Oregon State University, Corvallis, Oregon 97331
2. Department of Functional Morphology and Biomechanics, Zoological Institute of the University of Kiel, Kiel 24118, Germany
3. Max Planck Institute for Polymer Research, Mainz 55128, Germany
4. National Institute of Standards and Technology, Gaithersburg, Maryland 20899
5. Department of Chemistry, Aarhus University, Aarhus DK-8000, Denmark