Single File, Everyone (image) University of South Carolina Share Print E-Mail Caption The building blocks that make up Shimizu's 'molecular straws' are cyclic organic compounds, which self-assemble into hollow tubes. The smaller ring (compound labeled 1; top) self-assembles into straws with narrow-bore interiors that can accommodate xenon atoms only in single file. Credit Adapted from ACS Nano Usage Restrictions Credit ACS Nano 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.