Results 91 to 100 of about 739 (181)
Enceladus: Astrobiology Revisited
Journal of Geophysical Research: Biogeosciences, Volume 129, Issue 5, May 2024.Abstract Astrobiology research seeks to understand how life begins and evolves, and to determine whether life exist elsewhere in the universe. The discovery of diverse ocean worlds has significantly expanded the number of planetary bodies in the Solar System that could potentially contain life.
A. F. Davila, J. L. Eigenbrode
wiley +1 more source
A Census of Near-UV M-dwarf Flares Using Archival GALEX Data and the gPHOTON2 Pipeline
The Astrophysical Journal, 2023 M-dwarfs are common stellar hosts of habitable-zone exoplanets. Near-UV (NUV) radiation can severely impact the atmospheric and surface conditions of such planets, making the characterization of NUV flaring activity a key aspect in determining ...
Param Rekhi +3 more
doaj +1 more source
Implications of tides for life on exoplanets [PDF]
Astrobiology, Vol. 18, No. 7, 967-982 (2018), 2017 As evident from the nearby examples of Proxima Centauri and TRAPPIST-1, Earth-sized planets in the habitable zone of low-mass stars are common. Here, we focus on such planetary systems and argue that their (oceanic) tides could be more prominent due to stronger tidal forces.
arxiv +1 more source
Prebiotic Vitamin B3 Synthesis in Carbonaceous Planetesimals
ChemPlusChem, Volume 89, Issue 4, April 2024.Aqueous chemistry inside meteorite parent bodies allows the formation of prebiotic molecules crucial for all life in the early solar system. We present a reaction mechanism suitable for vitamin B3 synthesis in this environment, which is experimentally verified in the literature.
Klaus Paschek +3 more
wiley +1 more source
Galactic Distribution of Chirality Sources of Organic Molecules [PDF]
, 2016 Conceptualizing planetary habitability depends on understanding how living organisms originated and what features of environments are essential to foster abiogenesis. Estimates of the abundance of life's building blocks are confounded by incomplete knowledge of the role of chirality and racemization in organic compounds in the origination of living ...
arxiv +1 more source
A Field Trip to the Archaean in Search of Darwin’s Warm Little Pond
Life, 2016 Charles Darwin’s original intuition that life began in a “warm little pond” has for the last three decades been eclipsed by a focus on marine hydrothermal vents as a venue for abiogenesis.
Bruce Damer
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Bioverse: Potentially Observable Exoplanet Biosignature Patterns Under the UV Threshold Hypothesis for the Origin of Life [PDF]
A wide variety of scenarios for the origin of life have been proposed, with many influencing the prevalence and distribution of biosignatures across exoplanet populations. This relationship suggests these scenarios can be tested by predicting biosignature distributions and comparing them with empirical data.
arxiv +1 more source
Nitrogen heterocycles form peptide nucleic acid precursors in complex prebiotic mixtures
Scientific Reports, 2019 The ability to store information is believed to have been crucial for the origin and evolution of life; however, little is known about the genetic polymers relevant to abiogenesis.
Laura E. Rodriguez +4 more
doaj +1 more source
Three-stage Origin of Life as a Result of Directional Darwinian Evolution [PDF]
arXiv, 2012 The original hypothesis about Three-stage origin of life (TOL) on the Earth is developed and discussed. The role of the temperature factor in life origin is considered. It is supposed, that three stages of abiogenesis (DNA world, RNA world and the Protein world) consistently followed each other during Darwinian evolution.
arxiv
The grid method Beziers – d'Arcy-Thompson in the reconstruction of morphogenesis and abiogenesis: elementary biomimetic model [PDF]
Морфологія, 2011 We propose a new modification made in the morphology of biological imaging methods based on new types of components and nets. Shown its applicability not only in the comparative morphology and evolutionary and systematic, but also in abiogenetic studies.
Gradov O.V.
doaj