07 October 2009
Vol 1, Issue 1

About The Cover

Cover image expansion

ONLINE COVER Detailed view of a digital microfluidics device that extracts estradiol from tiny samples of tissue. In this segment of the process, a drop of methanol containing compounds extracted from the biological sample is circulated within a pool of isooctane to remove interfering substances. The droplet is driven from electrode to electrode by an applied AC potential. See Mousa et al. for a description of device fabrication and operation, and a discussion of its application to research and diagnostics. Each electrode is 1.5 millimeters2. [Image and animation: Chris Bickel, AAAS]