Prof. Dr. Siewert-Jan Marrink (IMAGE) University of Groningen Caption This is Siewert-Jan Marrink, Professor of Molecular Dynamics at the University of Groningen. He designed a set of parameters that allow fast but accurate coarse-grained simulations. In a paper that was published on 29 March in Nature Methods, Marrink and his co-workers present a third release of what is known as the Martini forcefield. Credit University of Groningen Usage Restrictions With 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.