Work Situation (IMAGE) Graz University of Technology Caption Christian Witz from the Institute for Process and Particle Technology at TU Graz in front of a Plexiglas model of a stirred and gassed (bio)reactor Credit © TU Graz Usage Restrictions None 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.