Quorum Sensing in Staph Bacteria (video) Princeton University, Engineering School Share Print E-Mail Loading video... Caption Researchers at Princeton added chemicals to the surface of materials that promote or inhibit bacterial communication known as quorum sensing. In the video cells change from glowing green to glowing red when the population grows sufficiently that quorum sensing begins. Credit Princeton University Usage Restrictions for non-commercial use Share Print E-Mail 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.