Charles Cai (IMAGE) University of California - Riverside Caption UC Riverside Associate Research Professor Charles Cai, who invented CELF, a biomass pretreatment technology that could make next-generation biofuels competitive with petroleum. Credit Stan Lim / UCR Usage Restrictions none 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.