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Xu Y, Jaffe R. Occurrence, distribution and origin of C30 cyclobotryococcenes in a subtropical wetland/estuarine ecosystem. Chemosphere. 2010;81(7):918-924.\par \par Simoneit BRT, Xu Y, Neto R, Cloutier J, Jaffe R. Photochemical alteration of 3-oxygenated triterpenoids: Implications for the origin of 3,4-seco-triterpenoids in sediments. Chemosphere. 2009;74:543-550.\par \par Xu Y, Jaffe R. Lipid biomarkers in suspended particulates from a subtropical estuary: Assessment of seasonal changes in sources and transport of organic matter. Marine Environmental Research. 2007;64:666-678.\par \par Xu Y, Holmes CW, Jaffe R. Paleoenvironmental assessment of recent environmental changes in Florida Bay, USA: A biomarker based study. Estuarine, Coastal and Shelf Science. 2007;73(1-2):201-210.\par \par Xu Y, Baker LA, Johnson PA. Trends in groundwater nitrate contamination in the Phoenix, Arizona region.  2007;27:49-56.\par \par Xu Y, Mead RN, Jaffe R. A molecular marker based assessment of sedimentary organic matter sources and distributions in Florida Bay. Hydrobiologia. 2006;569(1):179-192.\par \par Xu Y, Jaffe R, Wachnicka A, Gaiser EE. Occurrence of C25 highly branched isoprenoids in Florida Bay: Paleoenvironmental indicators of diatom-derived organic matter inputs. Organic Geochemistry. 2006;37(7):847-859.\par \par Mead RN, Xu Y, Chong J, Jaffe R. Sedimentary organic matter source assessment in a sub-tropical wetland and estuarine environment using the molecular distribution and carbon isotopic composition of n-alkanes. Organic Geochemistry. 2005;36(3):363-370.\par \par }