CALAS (IMAGE) Bielefeld University Caption This is professor Dr. Joachim Michael, Professor Dr. Olaf Kaltmeier, Nadine Pollvog (f. l.) organise the CALAS-project at Bielefeld University. Credit Bielefeld University Usage Restrictions he image may only be used with appropriate caption or credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.