PULSED-needle (IMAGE) Rice University Caption Sealed microparticles containing colored dye are shown inside the narrow opening of a standard-sized hypodermic needle. Credit Credit: Brandon Martin/Rice University Usage Restrictions Must credit: Brandon Martin/Rice University License Original 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.