Crystal Structures (image) Swiss Federal Laboratories for Materials Science and Technology (EMPA) Share Print E-Mail Caption This image shows crystal structures of (-) alpha, (-) beta and (-) gamma HBCDs (top to bottom). Alpha HBCD compounds in particular do not biodegrade well and accumulate along food chains. Credit Empa Usage Restrictions Use only with credits 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.