Chemistry of Airborne Particulate—Lung Interactions Revealed by Agustin Colussi and Colleagues
Agustin J. Colussi, senior research associate in environmental science and engineering, and colleagues have found that airborne particulates impair the lungs' naturaldefenses against ozone. Their research focused on what happens when air meets the thin layer of antioxidant-rich fluid that covers our lungs, protecting them from ozone, an air pollutant that pervades major cities. "We found new chemistry at the interfaces separating gases from liquids using a technique that continuously monitors the composition of these interfaces," Colussi says. Under normal physiological conditions, ascorbic acid instantly scavenges ozone, generating innocuous byproducts. However, the researchers discovered that when the fluid is acidic, a pathological condition found in asthmatics, ascorbic acid instead reacts with ozone to form potentially harmful compounds called ozonides.
Michael Dickinson Named to the American Academy of Arts and Sciences
Michael Dickinson, Esther M. and Abe M. Zarem Professor of Bioengineering, is among the 190 new Fellows elected to the American Academy of Arts and Sciences this year. Dickinson studies animal physiology and behavior and has become well known for Robofly, a mechanical fly that sprang from his work on the neurobiology and biomechanics of fly locomotion. Throughout his career, Dickinson has used a variety of tools, such as wind tunnels, virtual reality simulators, high-speed video, and giant robotic models, to determine how the poppy seed-sized brains of these tiny insects can rapidly control aerodynamic forces. More than a simple understanding of the material basis for insect flight, Dickinson's studies provide insight into complex systems operating on biological and physical principles: neuronal signaling within brains, the dynamics of unsteady fluid flow, the structural mechanics of composite materials, and the behavior of nonlinear systems are all linked when a fly takes wing. [Caltech Press Release].
A New Take on Microbrewing
David Boyd, Lecturer in Mechanical Engineering, graduate student James Adleman, Demitri Psaltis, Thomas G. Myers Professor of Electrical Engineering, and David Goodwin, Professor of Mechanical Engineering and Applied Physics, have crafted the world's tiniest still to concentrate scant amounts of micromolecules for easier detection. This device may help to overcome difficulties in tracking extremely low-abundance molecular biomarkers, which can indicate disease. [Caltech Press Release]