Catalytic system (IMAGE) ARC Centre of Excellence in Exciton Science Caption An atomic view of the catalytic system in which silver spheres represent gallium atoms and red spheres represent platinum atoms. The small green spheres are reactants and the blue ones are products – highlighting the catalytic reactions. Credit Dr Md. Arifur Rahim, UNSW Sydney. Usage Restrictions For use with this story only License Original 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.