1. Institute of Biotechnology and Biochemical Engineering, Graz University of Technology, Petersgasse 10-12/1, 8010 Graz, Austria
2. Institute for Electron Microscopy and Nanoanalysis, Graz University of Technology, Steyrergasse 17, 8010 Graz, Austria
3. Graz Centre of Electron Microscopy, Steyrergasse 17, A-8010 Graz, Austria
4. Austrian Centre of Industrial Biotechnology, Petersgasse 14, 8010 Graz, Austria