Biochar Chemical Signaling (IMAGE) Rice University Caption Rice University graduate student Shelly Hsiao-Ying Cheng shows the tool she created with Rice biochemist Joff Silberg to conduct two experiments in the same dish, one where biochar had a chance to interfere with a microbial conversation and another where it didn't. Credit Jeff Fitlow/Rice University Usage Restrictions Must credit: 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.