16 April 2004
Vol 304, Issue 5669

About The Cover

Cover image expansion

COVER Colorized scanning electron micrograph of a diatom chain collected by the Southern Ocean Iron Experiment (SOFeX); diatoms in the center of the chain have started to divide. Diatom colonies in Antarctic surface waters likely played a role in removing carbon dioxide from the atmosphere during glacial times. See page 408. [Image: S. J. Tanner and D. Breger; magnification x1890]