Ultrasound Can Temporarily Disrupt An Alginate Hydrogel (image) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Caption This graphic shows how ultrasound can temporarily disrupt an alginate hydrogel, which is held together by calcium ions (black dots) that are bound to acid chains (yellow). The gel self-heals when the ultrasound stops. Credit Harvard's Wyss Institute and Harvard SEAS Usage Restrictions Credit: Harvard's Wyss Institute and Harvard SEAS 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.