Introduction: One of the mysteries of Fe-sulfate observations on Mars is the discrepancy between the findings of jarosite and a variety of ferric sulfates at both Mars exploration rover sites (Gusev Crater and Meridiani Planum) [1,2] and the rarity of findings of Fesulfates by orbital remote sensing . By orbital remote sensing, Mgand Ca-sulfates have been identified with wide vertical and horiz...

soil-free rock rocks Introduction: Detection of elevated concentrations of S and Cl at the landing sites of Viking 1 and 2 [1], and Mars Pathfinder (MP) [2-5] reveals the presence of sulfates and chlorides in soil and rock samples [1-10]. These data are consistent with the findings of Ca sulfates and NaCl in Martian meteorites [11,12], and with Earth-based spectroscopic observations [13,14] ten...

Introduction: Sulfates have been identified on Mars by orbital remote sensing (OMEGA and CRISM) and during surface exploration (Viking, MER) [1-4]. MER rovers have found Fe-sulfates at both landing sites. A ferric sulfate (jarosite) was identified with the Mössbauer spectrometer (MB) in Meridiani Planum outcrops (~10 wt.%) [5]. At Gusev Crater, light-toned salty soils are hydrous as seen by Min...

Introdution: Hydrous sulfates (Ca-, Mg-, Fesulfates, and recently Al-sulfates) have been found on Mars by OMEGA (Mars Express orbiter) [1], CRISM (Mars Reconnaissance orbiter) [2], the Spirit and Opportunity rovers [3], and Phoenix lander [4]. Furthermore, the change in hydration degree of Fe 3+ -sulfates after exposed to the current Martian atmospheric condition was suggested by long-duration ...

The recovery of five free ketosteroids, three glucuronides, and six sulfates, added to water or urine and subjected to acid hydrolysis for various lengths of time, was investigated. Dehydroepiandrosterone (DHEA) in all its forms was most susceptible to destruction. The behavior of glucuronides and sulfates differed, and no single set of conditions provided equal recovery for all conjugates. A c...

The OMEGA/Mars Express hyperspectral imager identified hydrated sulfates on light-toned layered terrains on Mars. Outcrops in Valles Marineris, Margaritifer Sinus, and Terra Meridiani show evidence for kieserite, gypsum, and polyhydrated sulfates. This identification has its basis in vibrational absorptions between 1.3 and 2.5 micrometers. These minerals constitute direct records of the past aq...

Two novel triterpene sulfates have been isolated from Fusarium compactum by bioactivity-directed fractionation using an assay which measures the inhibition of proteolytic activity of rhinovirus 3C protease on a fluorogenic peptide substrate. The compounds were purified by countercurrent and reverse phase chromatographies. NMR, MS, UV and IR studies revealed two triterpene sulfates, uncommon met...