Results 101 to 110 of about 2,656 (202)

Evidence of Selection in Mineral Mediated Polymerization Reactions Executed in a Robotic Chemputer System

ChemSystemsChem, Volume 6, Issue 3, May 2024.
An automated platform explores the reactions of amino acids in the presence of mineral environments and searches for evidence of the onset of selection. The outcome of oligomerisation is significantly influenced by the presence of different minerals, with certain environments selecting specific fragments that enable the formation defined sequences as a
Silke Asche, Robert W. Pow, Hessam M. Mehr, Geoffrey J. T. Cooper, Abhishek Sharma, Leroy Cronin   +5 more
wiley   +1 more source

Beyond the Drake Equation: A Time-dependent Inventory of Habitable Planets and Life-bearing Worlds in the Solar Neighborhood

The Astrophysical Journal, 2023
We introduce a mathematical framework for statistical exoplanet population and astrobiology studies that may help direct future observational efforts and experiments.
Piero Madau
doaj   +1 more source

Formation of Amino Acids and Carboxylic Acids in Weakly Reducing Planetary Atmospheres by Solar Energetic Particles from the Young Sun

Life, 2023
Life most likely started during the Hadean Eon; however, the environmental conditions which contributed to the complexity of its chemistry are poorly known.
Kensei Kobayashi, Jun-ichi Ise, Ryohei Aoki, Miei Kinoshita, Koki Naito, Takumi Udo, Bhagawati Kunwar, Jun-ichi Takahashi, Hiromi Shibata, Hajime Mita, Hitoshi Fukuda, Yoshiyuki Oguri, Kimitaka Kawamura, Yoko Kebukawa, Vladimir S. Airapetian   +14 more
doaj   +1 more source

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

Toward homochiral protocells in noncatalytic peptide systems

, 2009
The activation-polymerization-epimerization-depolymerization (APED) model of Plasson et al. has recently been proposed as a mechanism for the evolution of homochirality on prebiotic Earth.
A Brack, A Brandenburg, A Brandenburg, A Commeyras, A Lazcano, B-M Rode, C Shen, C Viedma, CJ Welch, D Castelvecchi, D Deamer, D Deamer, D Deamer, D Segrè, D-G Blackmond, D-K Kondepudi, F-C Frank, G Wächtershäuser, G-F Joyce, G-F Joyce, H-J Morowitz, J-A Wattis, J-D Gunton, J-S Langer, J-W Szostak, JD Dunitz, K Soai, L Leman, M Fishkis, M Gleiser, M Gleiser, M Gleiser, M Huber, M Huber, M Reches, M Reches, M-P Robertson, Marcelo Gleiser, N Berclaz, N Berclaz, P-A Monnard, P-G-H Sandars, R Cotterill, R Lathe, R Lathe, R Plasson, R-M Smith, R-P Bywater, S Fox, S Fox, S Fox, S Lonchin, S Rasmussen, S Santoso, S Vauthey, S-L Miller, Sara Imari Walker, UJ Meierhenrich, V-A Avetisov, W-A Bonner, Y Saito, Y Saito   +61 more
core   +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, Mijin Lee, Dmitry A. Semenov, Thomas K. Henning   +3 more
wiley   +1 more source

Schets van de strijd over de generatio spontanea en van de beteekenis van deze strijd voor de ontwikkeling van de microbiologie [PDF]

, 1938
Door de onderzoekingen van Redi, Vallisnieri, Swammerdam en Leeuwenhoek is, ten aanzien van de kleine, lagere en hoogere dieren de strijd voor de mogelijkheid eener spontane generatie vrijwel tot stilstand gebracht....
Edens, Jacob Dirk
core   +1 more source

Subjective Evolution of Consciousness in Modern Science and Vedāntic Philosophy: Particulate Concept to Quantum Mechanics in Modern Science and Śūnyavāda to Acintya-Bhedābheda-Tattva in Vedānta [PDF]

, 2019
How the universe came to be what it is now is a key philosophical question. The hypothesis that it came from nothing or śūnya (as proposed by Stephen Hawking, among others) proves to be dissembling, since the quantum vacuum can hardly be considered a ...
Ph D. Shanta, PhD
core  

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, Sagi Ben-Ami, Volker Perdelwitz, Yossi Shvartzvald   +3 more
doaj   +1 more source

The Roles of Possibility and Mechanism in Narrative Explanation [PDF]

, 2018
There is a fairly longstanding distinction between what are called the ideographic as opposed to nomothetic sciences. The nomothetic sciences, such as physics, offer up explanations in terms of the laws and regular operations of nature.
Swaim, Daniel G.
core