Nanoparticles Triggering Erectile Activity (IMAGE) Albert Einstein College of Medicine Caption Nanoparticles developed by Einstein researchers can ferry drugs or other medically useful substances across the skin. In this study involving rats, nanoparticles contained either nitric oxide (shown above) or nitric oxide plus the drugs sialorphin or tadalafil. When carried across the skin, these agents relaxed smooth muscle tissue, resulting in increased blood flow and erectile activity. Credit Albert Einstein College of Medicine 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.