1. Biosensors and Bioelectronics Centre; IFM; Linköping University; Linköping 58183 Sweden
2. CNRS Enzyme and Cell Engineering Laboratory; Université de Technologie de Compiègn Rue Roger Couttolenc; CS 60319 60203 Compiègne Cedex France
3. Molecular Physics; IFM; Linköping University; Linköping 581 83 Sweden
4. Tekidag AB; UCS; Teknikringen 4A; Mjärdevi Science Park; Linköping 583 30 Sweden