Published in 2017-09-02 22:32:01
Professor of Geomicrobiology
Department of Geosciences,
University of Tübingen
Talk title: Arsenic mobilization and immobilization by iron(III)-reducing and iron(III)-oxidizing bacteria
Andreas Kappler is a chemist by training and received his PhD in 2000 in Environmental Microbiology from the University of Konstanz in Germany. After postdoc research at EAWAG/ETH Zurich (Switzerland) from 2000-2002 and at Caltech/Pasadena (USA) from 2002-2004, he is professor of Geomicrobiology at the University of Tuebingen in Germany. His main research focus is the mechanisms and geological/environmental implications of microbial transformations of Fe minerals. He has published >190 papers in international peer-reviewed journals including Science, Nature Geoscience, Scientific Reports and Nature Communications. Prof. Kappler and his group have experience in isolating and cultivating Fe(II)-oxidizing and Fe(III)-reducing bacteria, analyzing Fe minerals formed by these bacteria and quantifying the binding of toxic metals such as As to these minerals. Several members of his group and Prof. Kappler himself have done research in Vietnam, Bangladesh, and China to study the problem of As-contaminated drinking water and rice fields and he has studied As drinking water filters in Vietnam. His group has experience in growing rice plants, analyzing biogeochemical processes including mineral formation at the rice roots, and molecular biological methods (including qPCR and modern sequencing methods). Prof. Kappler combines pure culture cultivation experiments, microcosm studies, and column experiments with geochemical analyses, microscopy, spectroscopy and molecular biological analyses to identify biogeochemical processes and mechanisms relevant for the environmental fate of As. In particular electron microscopy techniques, synchrotron-based X-ray absorption spectroscopy techniques and Mössbauer spectroscopy are used for analyses of minerals and interactions of metals with these minerals.