Journal ArticleDOI
Detection of Perchlorate and the Soluble Chemistry of Martian Soil at the Phoenix Lander Site
Michael H. Hecht,Samuel P. Kounaves,Richard C. Quinn,S. J. West,S. M. M. Young,Douglas W. Ming,David C. Catling,David C. Catling,B. C. Clark,William V. Boynton,John H. Hoffman,Lauren DeFlores,K. Gospodinova,J. Kapit,Peter H. Smith +14 more
TLDR
Results suggest that the soil at the Phoenix landing site must have suffered alteration through the action of liquid water in geologically the recent past, and revealed an alkaline environment in contrast to that found by the Mars Exploration Rovers, indicating that many different environments have existed on Mars.Abstract:
The Wet Chemistry Laboratory on the Phoenix Mars Lander performed aqueous chemical analyses of martian soil from the polygon-patterned northern plains of the Vastitas Borealis. The solutions contained ~10 mM of dissolved salts with 0.4 to 0.6% perchlorate (ClO 4 ) by mass leached from each sample. The remaining anions included small concentrations of chloride, bicarbonate, and possibly sulfate. Cations were dominated by Mg 2+ and Na + , with small contributions from K + and Ca 2+ . A moderately alkaline pH of 7.7 ± 0.5 was measured, consistent with a carbonate-buffered solution. Samples analyzed from the surface and the excavated boundary of the ~5-centimeter-deep ice table showed no significant difference in soluble chemistry.read more
Citations
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疟原虫var基因转换速率变化导致抗原变异[英]/Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
Journal ArticleDOI
A habitable fluvio-lacustrine environment at Yellowknife Bay, Gale crater, Mars.
John P. Grotzinger,Dawn Y. Sumner,Linda C. Kah,K. M. Stack,Sanjeev Gupta,Lauren A. Edgar,David M. Rubin,Kevin W. Lewis,Juergen Schieber,Nicolas Mangold,Ralph E. Milliken,Pamela G. Conrad,David J. DesMarais,Jack D. Farmer,Kirsten L. Siebach,Fred Calef,Joel A. Hurowitz,Scott M. McLennan,Douglas W. Ming,David T. Vaniman,Joy A. Crisp,Ashwin R. Vasavada,Kenneth S. Edgett,Michael C. Malin,David F. Blake,Ralf Gellert,Paul R. Mahaffy,Roger C. Wiens,Sylvestre Maurice,John A. Grant,Sharon A. Wilson,Robert C. Anderson,Luther W. Beegle,Raymond E. Arvidson,Bernard Hallet,R. S. Sletten,Melissa S. Rice,James F. Bell,J. L. Griffes,Bethany L. Ehlmann,Ryan B. Anderson,Thomas F. Bristow,William E. Dietrich,Gilles Dromart,Jennifer L. Eigenbrode,Abigail A. Fraeman,Craig Hardgrove,K. E. Herkenhoff,Louise Jandura,Gary Kocurek,Seungwon Lee,Laurie A. Leshin,Richard Leveille,Daniel Limonadi,Justin N. Maki,Scott McCloskey,M. A. Meyer,Michelle E. Minitti,Horton E. Newsom,Dorothy Z. Oehler,Avi Okon,Marisa C. Palucis,T. J. Parker,Scott K. Rowland,Mariek E. Schmidt,S. W. Squyres,Andrew Steele,Edward M. Stolper,Roger E. Summons,Allan H. Treiman,Rebecca M. E. Williams,A. Yingst +71 more
TL;DR: The Curiosity rover discovered fine-grained sedimentary rocks, which are inferred to represent an ancient lake and preserve evidence of an environment that would have been suited to support a martian biosphere founded on chemolithoautotrophy.
Journal ArticleDOI
Spectral evidence for hydrated salts in recurring slope lineae on Mars
Lujendra Ojha,Mary Beth Wilhelm,Mary Beth Wilhelm,Scott L. Murchie,Alfred S. McEwen,James J. Wray,Jennifer Hanley,Marion Massé,Matthew Chojnacki +8 more
TL;DR: In this article, spectral analysis of spectral data reveals hydrated salts associated with the streaks, confirming a briny origin, but evidence of water or salts has been lacking, which is not the case in this paper.
Journal ArticleDOI
Mars’ Surface Radiation Environment Measured with the Mars Science Laboratory’s Curiosity Rover
Donald M. Hassler,Cary Zeitlin,Robert F. Wimmer-Schweingruber,Bent Ehresmann,Scot Rafkin,Jennifer L. Eigenbrode,David E. Brinza,G. Weigle,Stephan Böttcher,E. Böhm,Soenke Burmeister,Jingnan Guo,Jan Köhler,Cesar Martin,Guenther Reitz,Francis A. Cucinotta,Myung-Hee Y. Kim,David Grinspoon,Mark A. Bullock,Arik Posner,Javier Gómez-Elvira,Ashwin R. Vasavada,John P. Grotzinger +22 more
TL;DR: Measurements of the absorbed dose and dose equivalent from galactic cosmic rays and solar energetic particles on the martian surface for ~300 days of observations during the current solar maximum provide insight into the radiation hazards associated with a human mission to the surface of Mars and provide an anchor point with which to model the subsurface radiation environment.
Journal ArticleDOI
H2O at the Phoenix landing site.
Peter H. Smith,L. K. Tamppari,Raymond E. Arvidson,D. S. Bass,Diana L. Blaney,William V. Boynton,Allan I. Carswell,David C. Catling,David C. Catling,B. C. Clark,Thomas J. Duck,E. DeJong,David A. Fisher,Walter Goetz,Haraldur P. Gunnlaugsson,Michael H. Hecht,V. Hipkin,John H. Hoffman,Stubbe F. Hviid,H. U. Keller,Samuel P. Kounaves,Carlos F. Lange,Mark T. Lemmon,Morten Madsen,W. J. Markiewicz,John Marshall,Christopher P. McKay,Michael T. Mellon,D. W. Ming,R. V. Morris,William T. Pike,Nilton O. Renno,Urs Staufer,Carol R. Stoker,Peter A. Taylor,James A. Whiteway,Aaron P. Zent +36 more
TL;DR: The analysis of the data from the Phoenix mission revealed an alkaline environment, in contrast to that found by the Mars Exploration Rovers, indicating that many different environments have existed on Mars.
References
More filters
疟原虫var基因转换速率变化导致抗原变异[英]/Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A
TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
Journal ArticleDOI
Mars surface diversity as revealed by the OMEGA/Mars Express observations.
Jean-Pierre Bibring,Yves Langevin,Aline Gendrin,Brigitte Gondet,François Poulet,Michel Berthé,A. Soufflot,Raymond E. Arvidson,Nicolas Mangold,John F. Mustard,Pierre Drossart +10 more
TL;DR: The OMEGA investigation, on board the European Space Agency Mars Express mission, has identified and mapped mafic iron-bearing silicates of both the northern and southern crust, localized concentrations of hydrated phyllosilicates and sulfates but no carbonates, and ices and frosts with a water-ice composition of the north polar perennial cap.
Journal ArticleDOI
Microbial perchlorate reduction: rocket-fuelled metabolism
TL;DR: The recent completion of the whole-genome sequence of the perchlorate-reducing microorganism Dechloromonas aromatica offers further insight into the evolution and regulation of this unique metabolic pathway.
Journal ArticleDOI
H2O at the Phoenix landing site.
Peter H. Smith,L. K. Tamppari,Raymond E. Arvidson,D. S. Bass,Diana L. Blaney,William V. Boynton,Allan I. Carswell,David C. Catling,David C. Catling,B. C. Clark,Thomas J. Duck,E. DeJong,David A. Fisher,Walter Goetz,Haraldur P. Gunnlaugsson,Michael H. Hecht,V. Hipkin,John H. Hoffman,Stubbe F. Hviid,H. U. Keller,Samuel P. Kounaves,Carlos F. Lange,Mark T. Lemmon,Morten Madsen,W. J. Markiewicz,John Marshall,Christopher P. McKay,Michael T. Mellon,D. W. Ming,R. V. Morris,William T. Pike,Nilton O. Renno,Urs Staufer,Carol R. Stoker,Peter A. Taylor,James A. Whiteway,Aaron P. Zent +36 more
TL;DR: The analysis of the data from the Phoenix mission revealed an alkaline environment, in contrast to that found by the Mars Exploration Rovers, indicating that many different environments have existed on Mars.
Journal ArticleDOI
Sulfates in the north polar region of Mars detected by OMEGA/Mars Express.
TL;DR: The observations of the northern circumpolar regions of Mars reveal that water alteration played a major role in the formation of the constituting minerals of northerncircumpolar terrains.
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