3-D Plasmon Ruler with Protein (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The spatial freedom afforded the 3-D plasmon ruler's five nanorods enable it to measure the direction as well as the magnitude of structural changes in a macromolecule sample. Credit courtesy of Paul Alivisatos research group, Berkeley, CA 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.