1. Fraunhofer-Institut für Grenzflächen- und Bioverfahrenstechnik, Nobelstrasse 12, D-70569 Stuttgart, Germany, Laboratory of Soil Biochemistry, Center for Bioremediation and Detoxification, 129 Land and Water Building, The Pennsylvania State University, University Park, Pennsylvania 16802, and Universität Stuttgart, Institut für Mikrobiologie, Allmandring 31, D-70569 Stuttgart, Germany