Precise Polyrotaxane Synthesizer (VIDEO) Northwestern University This video is under embargo. Please login to access this video. Caption Sir Fraser Stoddart's laboratory has developed the most precise way to build polyrotaxanes, using an artificial molecular pump that installs rings onto a polymer string. Credit Northwestern University 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.