Masthead uni’wissen, the research magazine of the University of Freiburg, is published twice a year. Publisher Albert-Ludwigs-Universität Freiburg, Rector Prof. Dr. h.c. Hans-Jochen Schiewer Responsible for Content Rudolf-Werner Dreier, Director of the Office of Public Relations Expert Advisory Board Prof. Dr. Jürgen Bauhus, Forest Science Prof. Dr. Ralf von den Hoff, Archaeology Prof. Dr. Gunther Neuhaus, Vice President for Research, Biology Prof. Dr. Sabine Rospert, Medicine Prof. Dr. Margit Zacharias, Vice President for Innovation and Technology Transfer, Microsystems Engineering Editorial Staff Nicolas Scherger (Head Editor) Rimma Gerenstein, Katrin Albaum Address of Editorial Staff Presse- und Öffentlichkeitsarbeit Albert-Ludwigs-Universität Fahnenbergplatz, 79085 Freiburg Phone: +49 (0)761 203-4301 Fax: +49 (0)761 203-4278 E-Mail: uniwissen@pr.uni-freiburg.de Print Run 9,000 copies English Translation Dr. David Heyde Design, Layout Kathrin Jachmann Cover Photo Kurhan, olly (both Fotolia), Photo montage: Kathrin Jachmann Advertisements Gregor Kroschel Phone: +49 (0)761 203-4986 gregor.kroschel@zv.uni-freiburg.de Printing and Production Hofmann Druck, Emmendingen Distribution Office of Public Relations Yearly Subscription Price 6 euros uni’wissen is available free of charge for students and employees of the university. ISSN 2194-8054 © Albert-Ludwigs-Universität Freiburg. All rights reserved. Reproduction, also of excerpts, only with permission from the editors. Articles indicating the author’s name do not ne- cessarily reflect the opinions of the publisher or the editors. The editors reserve the right to edit or abridge articles sent in by external contributors. uni’wissen is available online at www.wissen.uni-freiburg.de Phone: +49 (0)761203-4301 Fax: +49 (0)761203-4278 Phone: +49 (0)761203-4986