1. Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Branch for Bioresources, 35392 Giessen, Germany
2. Sanofi-Aventis Deutschland GmbH, R&D, Industriepark Hoechst, 65926 Frankfurt am Main, Germany
3. Institute of Inorganic and Analytical Chemistry, Justus Liebig University, 35392 Giessen, Germany