Medusa (IMAGE) University of California - San Diego Caption A Medusa gas chromatograph/mass spectrometer at Scripps Institution of Oceanography, UC San Diego is used to detect trace gases in air samples. Credit Scripps Institution of Oceanography, UC San Diego 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.