28 February 1992
Vol 255, Issue 5048

About The Cover

Silicate glasses prepared with the sol-gel process that contain the encapsulated metalloproteins ferricytochrome c and ferrocytochrome c, copper-zinc superoxide dismutase and its cyanide adduct, and metmyoglobin. For the samples arranged in a circular fashion, the outer circle consists of aged gels and the inner circle of the corresponding xerogels. See page 1113. This issue of Science focuses on advances in the design, synthesis, and processing of materials. [Photographs by Louis Meluso]