Team Processes and Outcomes During the AMADEE-18 Mars Analog Mission.

abstract：:The order of magnitude of increased growth, multiplication rate, and decreased sporulation of Bacillus subtilis after exposure to nanotesla magnetic fields (MFs) relative to control samples were observed experimentally. Earth's total magnetic field intensity was reduced from 47.9 ± 0.4 μT to cover the range from 97.5 ...

journal_title：Astrobiology

authors： Obhođaš J,Valković V,Kollar R,Hrenović J,Nađ K,Vinković A,Orlić Ž

更新日期：2020-12-23 00:00:00

abstract：:Aqueous solutions on Mars are theorized to contain very different ion compositions than those on Earth. To determine the effect of such solutions on typical environmental micro-organisms, which could be released from robotic spacecraft or human exploration activity, we investigated the resistance of Sphingomonas desic...

journal_title：Astrobiology

authors： Stevens AH,Childers D,Fox-Powell M,Nicholson N,Jhoti E,Cockell CS

更新日期：2019-01-01 00:00:00

abstract：UNLABELLED:Permafrost-affected soils are characterized by a high abundance and diversity of methanogenic communities, which are considered suitable model organisms for potential life on Mars. Methanogens from Siberian permafrost have been proven to be highly resistant against divers stress conditions such as subzero te...

journal_title：Astrobiology

authors： Morozova D,Moeller R,Rettberg P,Wagner D

更新日期：2015-11-01 00:00:00

abstract：:To estimate the occurrence of terrestrial exoplanets and maximize the chance of finding them, it is crucial to understand the formation of planetary systems in general and that of terrestrial planets in particular. We show that a reliable formation theory should not only explain the formation of the Solar System, with...

journal_title：Astrobiology

authors： Alibert Y,Broeg C,Benz W,Wuchterl G,Grasset O,Sotin C,Eiroa C,Henning T,Herbst T,Kaltenegger L,Léger A,Liseau R,Lammer H,Beichman C,Danchi W,Fridlund M,Lunine J,Paresce F,Penny A,Quirrenbach A,Röttgering H,Selsi

更新日期：2010-01-01 00:00:00

abstract：:The Hayabusa2 mission successfully collected samples from the asteroid Ryugu last year and will return these to Earth in December 2020. It is anticipated that the samples will enable the analysis of terrestrially uncontaminated organic matter and minerals. Such analyses are in turn expected to elucidate the evolution ...

journal_title：Astrobiology

authors： Potiszil C,Tanaka R,Kobayashi K,Kunihiro T,Nakamura E

更新日期：2020-07-01 00:00:00

abstract：:The γ-radiolysis of fullerenes (C60 and C70) was performed to investigate the role of fullerenes as a carbon source in building organic molecules in astrophysical ice analog media. Mass spectrometric analyses and the sequential collision-induced dissociation processes enabled us to determine the plausible chemical str...

journal_title：Astrobiology

authors： Ursini O,Angelini G,Cataldo F,Iglesias-Groth S

更新日期：2019-07-01 00:00:00

abstract：:To the astrobiologist, Enceladus offers easy access to a potential subsurface biosphere via the intermediacy of a plume of water emerging directly into space. A direct question follows: If we were to collect a sample of this plume, what in that sample, through its presence or its absence, would suggest the presence an...

journal_title：Astrobiology

authors： Benner SA

更新日期：2017-09-01 00:00:00

abstract：:A long-term goal of exoplanet studies is the identification and detection of biosignature gases. Beyond the most discussed biosignature gas O2, only a handful of gases have been considered in detail. In this study, we evaluate phosphine (PH3). On Earth, PH3 is associated with anaerobic ecosystems, and as such, it is a...

journal_title：Astrobiology

authors： Sousa-Silva C,Seager S,Ranjan S,Petkowski JJ,Zhan Z,Hu R,Bains W

更新日期：2020-02-01 00:00:00

abstract：:The articles associated with this Special Collection focus on the NASA BASALT (Biologic Analog Science Associated with Lava Terrains) Research Program, which aims at answering the question, "How do we support and enable scientific exploration during human Mars missions?" To answer this the BASALT team conducted scient...

journal_title：Astrobiology

authors： Lim DSS,Abercromby AFJ,Kobs Nawotniak SE,Lees DS,Miller MJ,Brady AL,Miller MJ,Mirmalek Z,Sehlke A,Payler SJ,Stevens AH,Haberle CW,Beaton KH,Chappell SP,Hughes SS,Cockell CS,Elphic RC,Downs MT,Heldmann JL

更新日期：2019-03-01 00:00:00

abstract：:We revisit the validity of the presence of O(2) or O(3) in the atmosphere of a rocky planet as being a biosignature. Up to now, the false positive that has been identified applies to a planet during a hot greenhouse runaway, which is restricted to planets outside the habitable zone (HZ) of the star that are closer to ...

journal_title：Astrobiology

authors： Léger A,Fontecave M,Labeyrie A,Samuel B,Demangeon O,Valencia D

更新日期：2011-05-01 00:00:00

abstract：:The search for organic biosignatures on Mars will depend on finding material protected from the destructive ambient radiation. Solar ultraviolet can induce photochemical degradation of organic compounds, but certain clays have been shown to preserve organic material. We examine how the SHERLOC instrument on the upcomi...

journal_title：Astrobiology

authors： Razzell Hollis J,Fornaro T,Rapin W,Wade J,Vicente-Retortillo Á,Steele A,Bhartia R,Beegle LW

更新日期：2021-01-25 00:00:00

abstract：:Following the suggestion that nucleoside analogues having their nucleobases joined to ribose via a carbon-carbon bond might easily arise prebiotically, the glycosylation of uracil carrying electron-donating substituents (Me, OH, OCH3, NH2) at its 5 or 6 positions was investigated. Of these, only 6-aminouracil gave gly...

journal_title：Astrobiology

authors： Kim HJ,Benner SA

更新日期：2015-04-01 00:00:00

abstract：:Ultraviolet (UV) irradiation on the surface of Mars is an important factor that affects the survivability of microorganisms on Mars. The possibility of martian brines made from Fe2(SO4)3, MnSO4, and MgSO4 salts providing a habitable niche on Mars via attenuation of UV radiation was investigated on the bacteria Bacillu...

journal_title：Astrobiology

authors： Godin PJ,Schuerger AC,Moores JE

更新日期：2020-11-25 00:00:00

abstract：:The bicarbonate-buffered anoxic vent waters at Chocolate Pots hot springs in Yellowstone National Park are 51-54°C, pH 5.5-6.0, and are very high in dissolved Fe(II) at 5.8-5.9 mg/L. The aqueous Fe(II) is oxidized by a combination of biotic and abiotic mechanisms and precipitated as primary siliceous nanophase iron ox...

journal_title：Astrobiology

authors： Parenteau MN,Jahnke LL,Farmer JD,Cady SL

更新日期：2014-06-01 00:00:00

abstract：:Granitoids are silicic rocks that make up the majority of the continental crust, but different models arise for the origins of these rocks. One classification scheme defines different granitoid types on the basis of materials involved in the melting/crystallization process. In this end-member case, granitoids may be d...

journal_title：Astrobiology

authors： Trail D,Tailby ND,Sochko M,Ackerson MR

更新日期：2015-07-01 00:00:00

abstract：:Abstract We have developed a portable dual-wavelength laser fluorescence spectrometer as part of a multi-instrument optical probe to characterize mineral, organic, and microbial species in extreme environments. Operating at 405 and 532 nm, the instrument was originally designed for use by human explorers to produce a ...

journal_title：Astrobiology

authors： Groemer G,Sattler B,Weisleitner K,Hunger L,Kohstall C,Frisch A,Józefowicz M,Meszyński S,Storrie-Lombardi M,Bothe C,Boyd A,Dinkelaker A,Dissertori M,Fasching D,Fischer M,Föger D,Foresta L,Frischauf N,Fritsch L,Fuchs

更新日期：2014-05-01 00:00:00

abstract：:Viability rates were determined for microbial populations of Escherichia coli and Deinococcus radiodurans under the environmental stresses of low temperature (-35 degrees C), low-pressure conditions (83.3 kPa), and ultraviolet (UV) irradiation (37 W/m(2)). During the stress tests the organisms were suspended in saltwa...

journal_title：Astrobiology

authors： Diaz B,Schulze-Makuch D

更新日期：2006-04-01 00:00:00

abstract：:Photosynthesis on Earth can occur in a diversity of organisms in the photosynthetically active radiation (PAR) range of 10 nmol of photons m(-2) s(-1) to 8 mmol of photons m(-2) s(-1). Similar considerations would probably apply to photosynthetic organisms on Earth-like planets (ELPs) in the continuously habitable zon...

journal_title：Astrobiology

authors： Raven JA,Cockell CS

更新日期：2006-08-01 00:00:00

abstract：:Major discrepancies have been noted for some time between fossil ages and molecular divergence dates for a variety of taxa. Recently, systematic trends within avian clades have been uncovered. The trends show that the disparity is much larger for mitochondrial DNA than for nuclear DNA, also that it is larger for crown...

journal_title：Astrobiology

authors： Melott AL

更新日期：2017-01-01 00:00:00

abstract：UNLABELLED:The search for indisputable traces of life in Archean cherts is of prime importance. However, their great age and metamorphic history pose constraints on the study of molecular biomarkers. We propose a quantitative criterion to document the thermal maturity of organic matter in rocks in general, and Archean ...

journal_title：Astrobiology

authors： Delarue F,Rouzaud JN,Derenne S,Bourbin M,Westall F,Kremer B,Sugitani K,Deldicque D,Robert F

更新日期：2016-06-01 00:00:00

abstract：:Water is the fundamental molecule for life on Earth. Thus, the search for hibernating life-forms in waterless environments is an important research topic for astrobiology. To date, however, the organizational patterns containing microbial life in extremely dry places, such as the deserts of Earth, the Dry Valleys of A...

journal_title：Astrobiology

authors： Gómez Gómez JM,Medina J,Hochberg D,Mateo-Martí E,Martínez-Frías J,Rull F

更新日期：2014-07-01 00:00:00

abstract：:Mars Odyssey has given strong evidence for the existence of water in the upper martian surface at equatorial latitudes. The water content, which corresponds to the hydrogen in the soil, can regionally reach values up to about 15%. This water is mainly in the form of structurally and partially irreversibly bound "cryst...

journal_title：Astrobiology

authors： Möhlmann D

更新日期：2005-12-01 00:00:00

abstract：:This review of material relevant to the Conference on Biosignature Preservation and Detection in Mars Analog Environments summarizes the meeting materials and discussions and is further expanded upon by detailed references to the published literature. From this diverse source material, there is a detailed discussion o...

journal_title：Astrobiology

authors： Hays LE,Graham HV,Des Marais DJ,Hausrath EM,Horgan B,McCollom TM,Parenteau MN,Potter-McIntyre SL,Williams AJ,Lynch KL

更新日期：2017-04-01 00:00:00

abstract：UNLABELLED:We developed a prototype instrument called the Standoff Biofinder, which can quickly locate biological material in a 500 cm(2) area from a 2 m standoff distance with a detection time of 0.1 s. All biogenic materials give strong fluorescence signals when excited with UV and visible lasers. In addition, the lu...

journal_title：Astrobiology

authors： Misra AK,Acosta-Maeda TE,Sharma SK,McKay CP,Gasda PJ,Taylor GJ,Lucey PG,Flynn L,Abedin MN,Clegg SM,Wiens R

更新日期：2016-09-01 00:00:00

abstract：:The cloud layer has been hypothesized to be the most habitable region of Venus. In the lower clouds, both temperature and pressure fall within bounds that support reproduction of microbial life on Earth, although the water activity of the sulfuric acid cloud droplets makes the clouds uninhabitable to known life. In th...

journal_title：Astrobiology

authors： Cockell CS,Higgins PM,Johnstone AA

更新日期：2021-01-19 00:00:00

abstract：:A continuing challenge for scientists is to keep K-12 teachers informed about new scientific developments. Over the past few years, this challenge has increased as new research findings have come from the field of astrobiology. In addition to trying to keep abreast of these new discoveries, K-12 teachers must also fac...

journal_title：Astrobiology

authors： Prather EE,Slater TF

更新日期：2002-07-01 00:00:00

abstract：UNLABELLED:An approach to the origin of life, focused on the property of entities capable of reproducing themselves far from equilibrium, has been developed recently. Independently, the possibility of the emergence of life in the hydrothermal systems possibly present in the deep oceans below the frozen crust of some of...

journal_title：Astrobiology

authors： Pascal R

更新日期：2016-05-01 00:00:00

abstract：:Antarctic subglacial lakes are often considered suitable analogues to extraterrestrial subglacial aqueous environments. Recently, an environmentally friendly RECoverable Autonomous Sonde (RECAS) was designed at the Polar Research Center of Jilin University (JLU) to sample the water of subglacial lakes without contamin...

journal_title：Astrobiology

authors： Li Y,Talalay PG,Sysoev MA,Zagorodnov VS,Li X,Fan X

更新日期：2020-01-01 00:00:00

abstract：:The 1976 Viking Labeled Release (LR) experiment was positive for extant microbial life on the surface of Mars. Experiments on both Viking landers, 4000 miles apart, yielded similar, repeatable, positive responses. While the authors eventually concluded that the experiment detected martian life, this was and remains a ...

journal_title：Astrobiology

authors： Levin GV,Straat PA

更新日期：2016-10-01 00:00:00

abstract：:We investigate a new mechanism for producing oxidants, especially hydrogen peroxide (H2O2), on Mars. Large-scale electrostatic fields generated by charged sand and dust in the martian dust devils and storms, as well as during normal saltation, can induce chemical changes near and above the surface of Mars. The most dr...

journal_title：Astrobiology

authors： Atreya SK,Wong AS,Renno NO,Farrell WM,Delory GT,Sentman DD,Cummer SA,Marshall JR,Rafkin SC,Catling DC

更新日期：2006-06-01 00:00:00