UV photochemistry of DNA in vitro and in Bacillus subtilis spores at earth-ambient and low atmospheric pressure: implications for spore survival on other planets or moons in the solar system.

abstract：:Early Earth may have hosted a biologically mediated global organic haze during the Archean eon (3.8-2.5 billion years ago). This haze would have significantly impacted multiple aspects of our planet, including its potential for habitability and its spectral appearance. Here, we model worlds with Archean-like levels of...

journal_title：Astrobiology

authors： Arney G,Domagal-Goldman SD,Meadows VS

更新日期：2018-03-01 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：:There is concern in many developed countries that school students are turning away from science. However, students may be choosing not to study science and dismissing the possibility of a scientific career because, in the junior secondary years, they gain a false view of science and the work of scientists. There is a ...

journal_title：Astrobiology

authors： Fergusson J,Oliver C,Walter MR

更新日期：2012-12-01 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：:Abstract Technologies that enable rapid and efficient extraction of biomarker compounds from various solid matrices are a critical requirement for the successful implementation of in situ chemical analysis of the martian regolith. Here, we describe a portable subcritical water extractor that mimics multiple organic so...

journal_title：Astrobiology

authors： Amashukeli X,Grunthaner FJ,Patrick SB,Yung PT

更新日期：2008-06-01 00:00:00

abstract：:Bacterial endospores in the genus Bacillus are considered good models for studying interplanetary transfer of microbes by natural or human processes. Although spore survival during transfer itself has been the subject of considerable study, the fate of spores in extraterrestrial environments has received less attentio...

journal_title：Astrobiology

authors： Nicholson WL,Schuerger AC

更新日期：2005-08-01 00:00:00

abstract：:This experiment was aimed at establishing, for the first time, the survival capability of lichens exposed to space conditions. In particular, the damaging effect of various wavelengths of extraterrestrial solar UV radiation was studied. The lichens used were the bipolar species Rhizocarpon geographicum and Xanthoria e...

journal_title：Astrobiology

authors： Sancho LG,de la Torre R,Horneck G,Ascaso C,de Los Rios A,Pintado A,Wierzchos J,Schuster M

更新日期：2007-06-01 00:00:00

abstract：:Properties of avenues of transformation and their mutualism with forms of organization in dynamic systems are essential for understanding the evolution of prebiotic order. We have analyzed competition between two avenues of transformation in an A↔B system, using the simulation approach called BiADA (Biotic Abstract Du...

journal_title：Astrobiology

authors： Popa R,Cimpoiasu VM

更新日期：2013-05-01 00:00:00

abstract：:Epsomite (MgSO(4).7H(2)O) and hexahydrite (MgSO(4).6H(2)O) are common minerals found in marine evaporite deposits, in saline lakes as precipitates, in weathering zones of coal and metallic deposits, in some soils and their efflorescences, and possibly on the surface of Europa as evaporite deposits. Thermodynamic prope...

journal_title：Astrobiology

authors： Chou IM,Seal RR 2nd

更新日期：2003-10-01 00:00:00

abstract：:The astrobiological significance of certain environment types on Mars strongly depends on the temperature, duration, and chemistry of liquid water that was present there in the past. Recent works have focused on the identification of signs of ancient water on Mars, as it is more difficult to estimate the above-mention...

journal_title：Astrobiology

authors： Kereszturi A

更新日期：2012-06-01 00:00:00

abstract：:Recent measurements of methane (CH4) by the Mars Science Laboratory (MSL) now confront us with robust data that demand interpretation. Thus far, the MSL data have revealed a baseline level of CH4 (∼0.4 parts per billion by volume [ppbv]), with seasonal variations, as well as greatly enhanced spikes of CH4 with peak ab...

journal_title：Astrobiology

authors： Yung YL,Chen P,Nealson K,Atreya S,Beckett P,Blank JG,Ehlmann B,Eiler J,Etiope G,Ferry JG,Forget F,Gao P,Hu R,Kleinböhl A,Klusman R,Lefèvre F,Miller C,Mischna M,Mumma M,Newman S,Oehler D,Okumura M,Oremland R,

更新日期：2018-10-01 00:00:00

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：:Planetary protection is governed by the Outer Space Treaty and includes the practice of protecting planetary bodies from contamination by Earth life. Although studies are constantly expanding our knowledge about life in extreme environments, it is still unclear what the probability is for terrestrial organisms to surv...

journal_title：Astrobiology

authors： Smith SA,Benardini JN 3rd,Anderl D,Ford M,Wear E,Schrader M,Schubert W,DeVeaux L,Paszczynski A,Childers SE

更新日期：2017-03-01 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：:In this work, we provide an answer to the question formulated by Albert Eschenmoser: "How would you envisage the bridge between potentially primordial geochemistry that had been disordered and one that gradually became self-organizing?" Analysis of the free-energy profiles of some of the key reactions leading to forma...

journal_title：Astrobiology

authors： Šponer JE,Šponer J,Di Mauro E

更新日期：2019-09-01 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：:Astrobiology is an inherently interdisciplinary area of study, demanding communication across multiple fields: astronomy, geochemistry, planetary science, and so on. Successful communication requires that researchers be aware of the basic findings, open questions, and tools and techniques of allied fields and possess ...

journal_title：Astrobiology

authors： Burnam-Fink M,Desch SJ,Scalice D,Davis H,Huff CJ,Apai D

更新日期：2018-03-01 00:00:00

abstract：:Antibody microarrays are becoming frequently used tools for analytical purposes. A key factor for optimal performance is the stability of the immobilized (capturing) antibodies as well as those that have been fluorescently labeled to achieve the immunological test (tracers). This is especially critical for long-distan...

journal_title：Astrobiology

authors： de Diego-Castilla G,Cruz-Gil P,Mateo-Martí E,Fernández-Calvo P,Rivas LA,Parro V

更新日期：2011-10-01 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：UNLABELLED:Fluid inclusions trapped in ancient halite can contain a community of halophilic prokaryotes and eukaryotes that inhabited the surface brines from which the halite formed. Long-term survival of bacteria and archaea and preservation of DNA have been reported from halite, but little is known about the distribu...

journal_title：Astrobiology

authors： Wang J,Lowenstein TK,Fang X

更新日期：2016-06-01 00:00:00

abstract：:Equilibrium adsorption isotherm data for the purine base adenine has been obtained on several prebiotically relevant minerals by frontal analysis using water as a mobile phase. Adenine is far displaced toward adsorption on pyrite (FeS2), quartz (SiO2), and pyrrhotite (FeS), but somewhat less for magnetite (Fe3O4) and ...

journal_title：Astrobiology

authors： Cohn CA,Hansson TK,Larsson HS,Sowerby SJ,Holm NG

更新日期：2001-01-01 00:00:00

abstract：:In recent years, studies have shown that there are many similarities between comets and asteroids. In some cases, it cannot even be determined to which of these groups an object belongs. This is especially true for objects found beyond the main asteroid belt. Because of the lack of comet fragments, more progress has b...

journal_title：Astrobiology

authors： Bosiek K,Hausmann M,Hildenbrand G

更新日期：2016-04-01 00:00:00

abstract：:As photosynthesis on Earth produces the primary signatures of life that can be detected astronomically at the global scale, a strong focus of the search for extrasolar life will be photosynthesis, particularly photosynthesis that has evolved with a different parent star. We take previously simulated planetary atmosphe...

journal_title：Astrobiology

authors： Kiang NY,Segura A,Tinetti G,Govindjee,Blankenship RE,Cohen M,Siefert J,Crisp D,Meadows VS

更新日期：2007-02-01 00:00:00

abstract：:We critically investigate some evolutionary aspects of the famous Drake equation, which is usually presented as the central guide for research on extraterrestrial intelligence. It is shown that the Drake equation tacitly relies on unverified assumptions on both the physicochemical history of our galaxy and the propert...

journal_title：Astrobiology

authors： Cirković MM

更新日期：2004-07-01 00:00:00

abstract：:Fungi are not only present on Earth but colonize spacecraft and space stations as well. This review provides an extensive overview of the large and diverse group of fungal species that have been found in space, as well as those corresponding detection methods used and the existing and potential future prevention and c...

journal_title：Astrobiology

authors： De Middeleer G,Leys N,Sas B,De Saeger S

更新日期：2019-07-01 00:00:00

abstract：:Chocolate Pots hot spring (CP) is an Fe-rich, circumneutral-pH geothermal spring in Yellowstone National Park. Relic hydrothermal systems have been identified on Mars, and modern hydrothermal environments such as CP are useful for gaining insight into potential pathways for generation of biosignatures of ancient micro...

journal_title：Astrobiology

authors： Fortney NW,Beard BL,Hutchings JA,Shields MR,Bianchi TS,Boyd ES,Johnson CM,Roden EE

更新日期：2021-01-01 00:00:00

abstract：:The hyperarid core of the Atacama Desert is one of the driest and most inhospitable places on Earth, where life is most commonly found in the interior of rocks (i.e., endolithic habitats). Due to the extreme dryness, microbial activity in these habitats is expected to be low; however, the rate of carbon cycling within...

journal_title：Astrobiology

authors： Ziolkowski LA,Wierzchos J,Davila AF,Slater GF

更新日期：2013-07-01 00:00:00

abstract：:The EPOXI Discovery Mission of Opportunity reused the Deep Impact flyby spacecraft to obtain spatially and temporally resolved visible photometric and moderate resolution near-infrared (NIR) spectroscopic observations of Earth. These remote observations provide a rigorous validation of whole-disk Earth model simulatio...

journal_title：Astrobiology

authors： Robinson TD,Meadows VS,Crisp D,Deming D,A'hearn MF,Charbonneau D,Livengood TA,Seager S,Barry RK,Hearty T,Hewagama T,Lisse CM,McFadden LA,Wellnitz DD

更新日期：2011-06-01 00:00:00

abstract：:Remote sensing data are abundant, whereas surface in situ verification of atmospheric conditions is rare on Mars. Earth-based analogs could help gain an understanding of soil and atmospheric processes on Mars and refine existing models. In this work, we evaluate the applicability of the Weather Research and Forecastin...

journal_title：Astrobiology

authors： Breuer H,Berényi A,Mari L,Nagy B,Szalai Z,Tordai Á,Weidinger T

更新日期：2020-06-01 00:00:00

abstract：:Two terrestrial environments that have been proposed as analogs for the iron oxide precipitation in the Meridiani Planum region of Mars include the Rio Tinto precipitates and southern Utah marble concretions. Samples of two typical Utah iron oxide concretions and iron oxide precipitates in contact with biofilms from R...

journal_title：Astrobiology

authors： Souza-Egipsy V,Ormö J,Beitler Bowen B,Chan MA,Komatsu G

更新日期：2006-08-01 00:00:00