Calcium Ion Pairs (image) American Institute of Physics Share Print E-Mail Caption A standard calcium model overestimates how strongly calcium binds, leading to clumps of ion pairs (left). An intermediate model shows less clumping (middle), and a refined charge-scale model correctly predicts a weak association with carboxylic groups in water (not shown) (right). Credit Philip Mason and Elise Duboue-Dijon Usage Restrictions This image may be used only with appropriate credit. 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.