Researchers believe they have solved a puzzle that has long vexed science. The researchers provide the first three-dimensional model of an enzyme that links a simple sugar, glucose, into long-chain cellulose, the basic building block within plant cell walls that gives plants structure. Cellulose is nature's most abundant renewable biomaterial and an important resource for production of biofuels that represent alternatives to fossil fuels.http://feeds.sciencedaily.com/~r/sciencedaily/~3/F...