CHARCOAL 1 (IMAGE) Rice University Caption Artificial enzymes made of treated charcoal, seen in this atomic force microscope image, could have the power to curtail damaging levels of superoxides, toxic radical oxygen ions that appear at high concentrations after an injury. Credit Tour Group/Rice University 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.