1. Leibniz-Institute for Plasma Science and Technology (INP), Felix-Hausdorff-Straße 2, D-17489 Greifswald, Germany
2. Department
of Cell Biology, University Medical Center Rostock, Schillingallee
69, D-18057 Rostock, Germany
3. Department
of Biomaterials, Institute for Bioprocessing and Analytical Measurement Techniques e.V., Rosenhof, D-37308 Heilbad Heiligenstadt, Germany