Abstract:
:Cyanobacteria and similar organisms produced most of the oxygen found in Earth's atmosphere, which implies that early photosynthetic organisms would have lived in an atmosphere that was rich in CO2 and poor in O2. We investigated the tolerance of several cyanobacteria to very high (>20 kPa) concentrations of atmospheric CO2. Cultures of Synechococcus PCC7942, Synechocystis PCC7942, Plectonema boryanum, and Anabaena sp. were grown in liquid culture sparged with CO2-enriched air. All four strains grew when transferred from ambient CO2 to 20 kPa partial pressure of CO2 (pCO2), but none of them tolerated direct transfer to 40 kPa pCO2. Synechococcus and Anabaena survived 101 kPa (100%) pCO2 when pressure was gradually increased by 15 kPa per day, and Plectonema actively grew under these conditions. All four strains grew in an anoxic atmosphere of 5 kPa pCO2 in N2. Strains that were sensitive to high CO2 were also sensitive to low initial pH (pH 5-6). However, low pH in itself was not sufficient to prevent growth. Although mechanisms of damage and survival are still under investigation, we have shown that modern cyanobacteria can survive under Earth's primordial conditions and that cyanobacteria-like organisms could have flourished under conditions on early Mars, which probably had an atmosphere similar to early Earth's.
journal_name
Astrobiologyjournal_title
Astrobiologyauthors
Thomas DJ,Sullivan SL,Price AL,Zimmerman SMdoi
10.1089/ast.2005.5.66keywords:
subject
Has Abstractpub_date
2005-02-01 00:00:00pages
66-74issue
1eissn
1531-1074issn
1557-8070journal_volume
5pub_type
杂志文章相关文献
ASTROBIOLOGY文献大全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
pub_type: 杂志文章
doi:10.1089/ast.2006.6.668
更新日期:2006-08-01 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
pub_type: 杂志文章
doi:10.1089/ast.2013.1122
更新日期:2014-06-01 00:00:00
abstract::Polymeric compounds similar to oligonucleotides are relevant to the origin of life and particularly to the concept of an RNA world. Although short oligomers of RNA can be synthesized nonenzymatically under laboratory conditions by second-order reactions in concentrated solutions, there is no consensus on how these pol...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/15311070152757465
更新日期:2001-10-01 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
pub_type: 杂志文章
doi:10.1089/ast.2012.0933
更新日期:2013-05-01 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
pub_type: 杂志文章
doi:10.1089/ast.2020.2280
更新日期:2021-01-19 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
pub_type: 杂志文章
doi:10.1089/ast.2016.1611
更新日期:2017-09-01 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
pub_type: 杂志文章
doi:10.1089/ast.2005.5.536
更新日期:2005-08-01 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
pub_type: 杂志文章
doi:10.1089/ast.2013.1081
更新日期:2014-05-01 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
pub_type: 杂志文章
doi:10.1089/153110701753593874
更新日期:2001-01-01 00:00:00
abstract::Meaningful motion is an unambiguous biosignature, but because life in the Solar System is most likely to be microbial, the question is whether such motion may be detected effectively on the micrometer scale. Recent results on microbial motility in various Earth environments have provided insight into the physics and b...
journal_title:Astrobiology
pub_type: 杂志文章,评审
doi:10.1089/ast.2015.1376
更新日期:2016-10-01 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
pub_type: 杂志文章
doi:10.1089/ast.2006.6.332
更新日期:2006-04-01 00:00:00
abstract::Oligonucleotides are structurally similar to short RNA strands. Therefore, their formation via non-enzymatic reactions is highly relevant to Gilbert's RNA world scenario (1986) and the origin of life. In laboratory synthesis of oligonucleotides from monomers, it is necessary to remove the water molecules from the reac...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2007.0138
更新日期:2007-10-01 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
pub_type: 杂志文章
doi:10.1089/ast.2014.1264
更新日期:2015-04-01 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
pub_type: 杂志文章
doi:10.1089/ast.2015.1412
更新日期:2016-05-01 00:00:00
abstract::Small-scale terracing (microterracettes) is a surface geomorphic feature that recurs under a range of environmental settings, such as those existing in high to low temperature geothermal springs and evaporitic environments, through the single or combined action of physicochemical agents and microbiological processes. ...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2017.1646
更新日期:2018-10-01 00:00:00
abstract::Understanding microbial diversity in spacecraft assembly clean rooms is of major interest with respect to planetary protection considerations. A coordinated screening of different clean rooms in Europe and South America by three German institutes [Deutsches Zentrum für Luft- und Raumfahrt (DLR), Leibniz-Institut DSMZ-...
journal_title:Astrobiology
pub_type: 杂志文章,评审
doi:10.1089/ast.2013.1024
更新日期:2013-12-01 00:00:00
abstract::The objective of the 2009 Mars Science Laboratory (MSL), which is planned to follow the Mars Exploration Rovers and the Phoenix lander to the surface of Mars, is to explore and assess quantitatively a site on Mars as a potential habitat for present or past life. Specific goals include an assessment of the past or pres...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2007.0160
更新日期:2008-06-01 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
pub_type:
doi:10.1089/ast.2018.1869
更新日期:2019-03-01 00:00:00
abstract::The discovery by NASA's Cassini mission at Saturn in 2005 of a large plume of material erupting from the south polar terrain of Enceladus, sourced within a subsurface ocean of salty liquid water laced with organic compounds, has brought together scientists from a diverse range of disciplines over the last decade to ev...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2017.1711
更新日期:2017-09-01 00:00:00
abstract::Dryness is one of the main environmental challenges to microbial survival. Understanding the threshold of microbial tolerance to extreme dryness is relevant to better constrain the environmental limits of life on Earth and critically evaluate long-term habitability models of Mars. Biomolecular proxies for microbial ad...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2017.1705
更新日期:2018-07-01 00:00:00
abstract::We describe a continuous high-pressure flow reactor designed to simulate the unforced convective interaction of hydrothermal solutions and ocean waters with submarine crust on early Earth-conditions appropriate to those that may have led to the onset of life. The experimental operating conditions are appropriate for i...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2009.0456
更新日期:2010-10-01 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
pub_type: 杂志文章,评审
doi:10.1089/ast.2011.0686
更新日期:2012-06-01 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
pub_type: 杂志文章
doi:10.1089/ast.2019.2198
更新日期:2020-07-01 00:00:00
abstract::The five major mass extinctions identified in 1982 by Raup and Sepkoski have expanded to six, with the suggestion that the Permian-Triassic extinction was a double event. Is there a general explanation for great mass extinctions, or can they result from different triggers, or even from internal system instabilities? T...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/153110703321632480
更新日期:2003-04-01 00:00:00
abstract::We propose a terahertz (far-infrared) circular dichroism-based life-detection technology that may provide a universal and unequivocal spectroscopic signature of living systems regardless of their genesis. We argue that, irrespective of the specifics of their chemistry, all life forms will employ well-structured, chira...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/153110703322610609
更新日期:2003-10-01 00:00:00
abstract::Nitrogen is the major component of Earth's atmosphere and plays important roles in biochemistry. Biological systems have evolved a variety of mechanisms for fixing and recycling environmental nitrogen sources, which links them tightly with terrestrial nitrogen reservoirs. However, prior to the emergence of biology, al...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2017.1700
更新日期:2018-07-01 00:00:00
abstract::The search for organic molecules at the surface of Mars is a top priority of the next Mars exploration space missions: Mars Science Laboratory (NASA) and ExoMars (ESA). The detection of organic matter could provide information about the presence of a prebiotic chemistry or even biological activity on this planet. Ther...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2011.0756
更新日期:2012-05-01 00:00:00
abstract::The aim of this study was to analyze tolerance to heavy ions in desiccated animals of the eutardigrade Richtersius coronifer and the bdelloid rotifer Mniobia russeola within the STARLIFE project. Both species were exposed to iron (Fe) and helium (He) ions at the Heavy Ion Medical Accelerator in Chiba (HIMAC) in Chiba,...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2015.1462
更新日期:2017-02-01 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
pub_type: 杂志文章
doi:10.1089/ast.2011.0647
更新日期:2011-10-01 00:00:00
abstract::The Mars Organic Analyzer (MOA) has enabled the sensitive detection of amino acid and amine biomarkers in laboratory standards and in a variety of field sample tests. However, the MOA is challenged when samples are extremely acidic and saline or contain polyvalent cations. Here, we have optimized the MOA analysis, sam...
journal_title:Astrobiology
pub_type: 杂志文章
doi:10.1089/ast.2009.0357
更新日期:2009-11-01 00:00:00