Measuring Epoxides (image) California Institute of Technology Caption Caltech scientists used mass spectrometers on NASA's DC8 aircraft to measure epoxides above Canada's Boreal Forest last summer. These epoxides are formed from isoprene, a chemical emitted into the atmosphere by many deciduous plants. Credit Yohei Shinozuka Usage Restrictions With credit as given above 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.