The impacts of distribution water quality changes caused by blending different source waters on lead release from corrosion loops containing small lead coupons were investigated in a pilot distribution study. The 1-year pilot study demonstrated that lead release to drinking water increased as chlorides increased and sulfates decreased. Silica and calcium inhibited lead release to a lesser degre...

Sulfotransferase-2A1 catalyzes the formation of bile acid-sulfates (BA-sulfates). Sulfation of BAs increases their solubility, decreases their intestinal absorption, and enhances their fecal and urinary excretion. BA-sulfates are also less toxic than their unsulfated counterparts. Therefore, sulfation is an important detoxification pathway of BAs. Major species differences in BA sulfation exist...

Glycosaminoglycan biosynthesis was studied in developing chick corneas, with particular attention paid to keratan sulfate I, the major glycosaminoglycan of this tissue. This polysaccharide is unique to the cornea and may be required for the development and maintenance of cornea1 transparency. Corneas from 5. to 20-day chick embryos were labeled in uitro with D[6-3H]glucosamine and H2”S0,, and t...

Introduction: The presence of sulfates on the surface of Mars was indicated by a strong Mg-S correlation in the fluorescence data obtained by the Viking landers [1]. Sulfates were subsequently identified as being present in the soil at the Pathfinder landing site at a concentration of ~ 10 % MgSO4 [2]. Data from the Opportunity rover indicates that sulfates of probable evaporite origin are pres...

The Curiosity rover in Gale crater is investigating a mineral transition observed from orbit – an older “clay unit” to younger “sulfate hypothesized reflect the aridification of Mars’ climate. Below this transition, detected crystalline Ca-sulfates with minor Fe-sulfates but also found that some fraction rock’s bulk SO3 often poorly constrained X-ray amorphous component. Here, we characterize a...

Introduction: Fe-sulfates with OH &/or H2O are found in martian meteorites [e.g. 1] & on the martian surface [e.g. 2]. These minerals may provide evidence for past surface environments & potential habitability, [e.g. 3]. Several studies have characterized Fe-sulfates using spectral features [e.g., 4-6]. However, unique identification of Fe-sulfates is hampered by the occurrence of mineral assem...

1. An enzyme, “chondroitinase-ABC,” has been purified to apparent homogeneity from extracts of Proteus vulgaris, NCTC 4636, which was adapted on a medium containing chondroitin sulfate C. It has the following properties. (a) At pH 8, it degrades chondroitin sulfates A, B, and C at greater rates than chondroitin and hyaluronic acid. It does not attack keratosulfate, heparin, or heparitin sulfate...

2514 for XXXXIII Lunar and Planetary Science Conference (2012, Houston, TX) SYNTHESIS AND SPECTRAL CHARACTERIZATION OF OH-BEARING FERRIC SULFATES. Yanli Lu and Alian Wang, Dept. of Earth & Planetary Sciences, McDonnell Center for Space Sciences, Washington University in St. Louis ( [email protected], [email protected] ) Ferric sulfates on Mars: Among the Martian sulfates, Caand Mg-sulfat...

Introduction: Chemical compounds of S 6+ , sulfates and/or SO3, occur on Earth, Venus, Mars, parent bodies of carbonaceous chondrites, and icy surfaces of Europa and Ganymede. On the terrestrial planets, formation of S 6+ species is related to atmospheric photochemical processes that produce O2 and other O-rich oxidants. Here we explain the formation of sulfates within chondritic bodies through...