Nano-Sieves (IMAGE) Helmholtz-Zentrum Dresden-Rossendorf Caption The left ion in the diagram is deflected by a collision with an atom in the membrane, which is only one nanometer thick and loses considerably more energy than previously believed (red arrow); the right ion passes virtually unhindered through the membrane (green arrow). Credit Helmholtz-Zentrum Dresden-Rossendorf 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.