NIST Method for Separating Nanoparticles from Organisms (image) National Institute of Standards and Technology (NIST) Share Print E-Mail Caption Graphic displaying the NIST-designed sucrose density gradient used to separate excess engineered nanoparticles (ENPs) in solution from roundworms and any ENPs they consumed. Loose or externally attached ENPs are trapped in the uppermost salt layer and lower density sucrose layers. Worms with ingested ENPs move downward to settle in the higher density sucrose layers. Credit M. Johnson/NIST Usage Restrictions None 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.