20 January 2012
Vol 335, Issue 6066

About The Cover

Cover image expansion

COVER Brown seaweed (Macrocystis pyrifera), commonly known as giant kelp, off the coast of Chiloe Island, Chile (image width ~1 meter). Traditionally, seaweed has been ignored as a source of renewable fuel and chemical compounds for bioconversion, because its primary sugar component is not easily fermented. Wargacki et al. engineered a microbe to extract sugars from brown seaweed and convert them into low-carbon, renewable fuels and chemicals. See page 308. Photo: Julián Fernández