Dr. William York of the Complex Carbohydrate Research Center has created these two databases with scientific input from others at the University of Georgia. The Xyloglucan NMR Database consists of a searchable table of the ?H-NMR chemical shifts of xyloglucan oligoglycosyl alditols. Xyloglucans are highly branched polymers with a cellulosic backbone (i.e., consisting of b-(1,4)-linked D-glucosyl residues). The basis for the most commonly used nomenclature for xyloglucan structures comes from the linear array of glycosyl side chains that many of the backbone residues bear. The Partially Methylated Alditol Acetate (PMAA) Database shows the molecular structures of PMAAs derived from Hexopyranosyl, Pentopyranosyl, and Pentofuranosyl Residues. Users view the structures by gliding the mouse over a table. The PMAA Database also says that electron-impact mass spectra are available, but at the time of publication, these links weren't working. The Xyloglucan database comes with overviews, search guides, and nomenclature information. The PMAA database has a help page. Both require a free login.