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 ± 1.7 nT to 1115 ± 158 nT in eight subsequent experiments by using three pairs of Helmholtz coils combined with Mu-metal shielding. The growth, multiplication rate, sporulation, and potassium content were measured in the probe and control containing B. subtilis cultures after 24 h of exposure to nanotesla and Earth's magnetic fields, respectively. The observed effect is discussed with regard to its possible repercussions on Earth's living species during geomagnetic reversals that occurred when the magnetic field was much weaker than the field that exists today. In addition, effects on future manned voyages into deep space, an environment with reduced magnetic field intensity, are considered.
journal_name
Astrobiologyjournal_title
Astrobiologyauthors
Obhođaš J,Valković V,Kollar R,Hrenović J,Nađ K,Vinković A,Orlić Ždoi
10.1089/ast.2020.2288subject
Has Abstractpub_date
2020-12-23 00:00:00eissn
1531-1074issn
1557-8070pub_type
杂志文章相关文献
ASTROBIOLOGY文献大全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：:Raman spectroscopy is being adopted as a nondestructive instrumentation for the robotic exploration of Mars to search for traces of life in the geological record. Here, miniaturized Raman spectrometers of two different types equipped with 532 and 785 nm lasers for excitation, respectively, were compared for the detect...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2012.0879
更新日期：2012-12-01 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
pub_type： 杂志文章
doi：10.1089/ast.2006.6.668
更新日期：2006-08-01 00:00:00
abstract：:Understanding the impact of active M dwarf stars on the atmospheric equilibrium and surface conditions of a habitable zone Earth-like planet is key to assessing M dwarf planet habitability. Previous modeling of the impact of electromagnetic (EM) radiation and protons from a single large flare on an Earth-like atmosphe...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2017.1794
更新日期：2019-01-01 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
pub_type： 杂志文章,评审
doi：10.1089/ast.2018.1854
更新日期：2019-07-01 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：:We show that terrestrial planets in the habitable zones of M dwarfs older than ∼1 Gyr could have been in runaway greenhouses for several hundred million years following their formation due to the star's extended pre-main sequence phase, provided they form with abundant surface water. Such prolonged runaway greenhouses...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2014.1231
更新日期：2015-02-01 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
pub_type： 杂志文章
doi：10.1089/ast.2020.2285
更新日期：2020-11-25 00:00:00
abstract：:A phylogenomic dating approach was used to identify potential age constraints for multiple archaeal groups, many of which have no fossil, isotopic, or biomarker record. First, well-resolved phylogenetic trees were inferred with the use of multiple gene sequences obtained from whole genome sequences. Next, the ability ...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2008.0247
更新日期：2009-03-01 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
pub_type： 杂志文章
doi：10.1089/ast.2020.2362
更新日期：2021-01-25 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
pub_type： 杂志文章
doi：10.1089/ast.2014.1248
更新日期：2015-07-01 00:00:00
abstract：:Like all low- and moderate-mass stars, the Sun will burn as a red giant during its later evolution, generating of solar luminosities for some tens of millions of years. During this post-main sequence phase, the habitable (i.e., liquid water) thermal zone of our Solar System will lie in the region where Triton, Pluto-C...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/153110703769016406
更新日期：2003-07-01 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 possible meteorite parent body origin of Earth's pregenetic nucleobases is substantiated by the guanine (G), adenine (A), and uracil (U) measured in various meteorites. Cytosine (C) and thymine (T), however, are absent in meteorites, making the emergence of an RNA and later RNA/DNA/protein world problematic. We in...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2015.1451
更新日期：2016-11-01 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：: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
pub_type： 杂志文章
doi：10.1089/ast.2011.0642
更新日期：2011-06-01 00:00:00
abstract：:The Planetary Society's Phobos Living Interplanetary Flight Experiment (Phobos LIFE) flew in the sample return capsule of the Russian Federal Space Agency's Phobos Grunt mission and was to have been a test of one aspect of the hypothesis that life can move between nearby planets within ejected rocks. Although the Phob...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2018.1904
更新日期：2019-09-01 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 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：:The discovery of potentially habitable planets around the ultracool dwarf star Trappist-1 naturally poses the question: could Trappist-1 planets be home to life? These planets orbit very close to the host star and are most susceptible to the UV radiation emitted by the intense and frequent flares of Trappist-1. Here, ...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2019.2126
更新日期：2020-12-01 00:00:00
abstract：:Raman spectroscopy can provide chemical information about organic and inorganic substances quickly and nondestructively with little to no sample preparation, thus making it an ideal instrument for Mars rover missions. The ESA ExoMars planetary mission scheduled for launch in 2018 will contain a miniaturized Raman spec...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2015.1334
更新日期：2015-09-01 00:00:00
abstract：:The self-assembly of simple amphiphiles like fatty acids into cell-like membranous structures suggests that such structures were available on prebiotic Earth to support the origin of cellular life. However, the composition of primitive membranes remains unclear because the physical properties of the aqueous environmen...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2009.0384
更新日期：2009-12-01 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：:Several observations indicate that the cloud deck of the venusian atmosphere may provide a plausible refuge for microbial life. Having originated in a hot proto-ocean or been brought in by meteorites from Earth (or Mars), early life on Venus could have adapted to a dry, acidic atmospheric niche as the warming planet l...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/153110704773600203
更新日期：2004-04-01 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
pub_type： 杂志文章
doi：10.1089/ast.2018.1840
更新日期：2019-01-01 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
pub_type： 杂志文章
doi：10.1089/153110704323175160
更新日期：2004-07-01 00:00:00
abstract：:The primary objective of NASA's Mars Science Laboratory (MSL) mission, which will launch in 2011, is to characterize the habitability of a site on Mars through detailed analyses of the composition and geological context of surface materials. Within the framework of established mission goals, we have evaluated the valu...
journal_title：Astrobiology
pub_type： 杂志文章
doi：10.1089/ast.2010.0491
更新日期：2010-09-01 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
pub_type： 杂志文章,评审
doi：10.1089/ast.2006.0108
更新日期：2007-02-01 00:00:00
abstract：:In spite of the spectacular developments in our understanding of the molecular basis that underlies biological phenomena, we still lack a generally agreed-upon definition of life, but this is not for want of trying. Life is an empirical concept; and, as suggested by the many unsuccessful efforts to define it, this tas...
journal_title：Astrobiology
pub_type： 历史文章,杂志文章
doi：10.1089/ast.2010.0535
更新日期：2010-12-01 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
pub_type： 杂志文章
doi：10.1089/ast.2019.2058
更新日期：2021-01-01 00:00:00
