19 October 2007
Vol 318, Issue 5849

About The Cover

Cover image expansion

COVER Structure of a gold nanoparticle in which the central atoms are packed in a decahedron, surrounded by additional layers of gold atoms in unanticipated geometries. Gold atoms, gold; sulfur atoms, blue; carbon atoms, white; oxygen atoms, red; the superimposed red mesh depicts the electron-density distribution determined by x-ray crystallography. See page 430. Image: Pablo D. Jadzinsky and Guillermo Calero