1. Chemical Process Engineering (CVT), Faculty of Production Engineering, University of Bremen, Leobener Str. 6, 28359 Bremen, Germany
2. Center for Environmental Research and Sustainable Technology (UFT), Post box 330 440, 28334 Bremen, Germany
3. MAPEX Center for Materials and Processes, University of Bremen, Post box 330 440, 28334 Bremen, Germany
4. in vivo MR group, Faculty of Chemistry, University of Bremen, Leobener Str. NW2, 28359 Bremen, Germany