Effect of Phase on Alpha-Pinene Reactivity (image) Harvard University Share Print E-Mail Caption This diagram illustrates the effect of phase on the chemical reactivity of alpha-pinene, a type of secondary organic material that is common in the atmosphere. Credit Courtesy of Kuwata Mikinori and PNAS. Usage Restrictions None 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.