Methods. From 1993 through 2001, we randomly assigned 76,693 men at 10 U. S. study centers to receive either annual screening 38,343 subjects or usual care as the. Structurally xylan is a homopolymer of Dxylopyranose residues in 1 4 linkages with a degree of polymerization ranging from 150 to 200. K., 1. 98. 5, Controlled Shot Peening of Automotive Components, SAE Technical Paper No. Society of Automotive Engineers, Warrendale, PA, USA.