Push and Pull (image) Brown University Share Print E-Mail Caption Brown University researchers have shown that the effects of external strain on a catalyst depend on the internal strain exerted by chemical reactants. That new theoretical framework could be useful in optimizing catalysts for different reactions. Credit Peterson lab / Brown University Usage Restrictions None Share Print E-Mail 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.