Protein Movement (IMAGE) University of Delaware Caption A team of engineers has shown that surface diffusion in protein transport into ion-exchange beads depends on adsorption affinity -- a measure of attraction between the two materials. Credit Photo courtesy of Ohnmar Khanal, Vijesh Kumar and Abraham Lenhoff 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.