Results 101 to 110 of about 2,707 (204)

Biophysical Approach to Understand Life and Cancer

Aging and Cancer, Volume 5, Issue 3, Page 70-90, September 2024.
ABSTRACT Background From the perspective of biology, the characteristics of life can be categorized as cellular organizations, homeostasis, metabolism, growth, reproduction and heredity, response to stimuli and adaptation to the environment. From the perspective of physics, living organisms are highly ordered, complex, thermodynamically open systems ...
Nuri Faruk Aykan
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

Clumped Isotope Signatures of Abiotic Methane: The Role of the Combinatorial Isotope Effect

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 7, July 2024.
Abstract Methane clumped isotope signatures of abiogenesis may be diagnostic of the origin of methane on Earth and other planetary bodies. We performed synthesis of abiogenic methane in hydrothermal conditions between 130 and 300°C and determined δ13C, δD, Δ13CH3D, and Δ12CH2D2.
Jabrane Labidi, Thomas M. McCollom, Thomas Giunta, Barbara Sherwood Lollar, William D. Leavitt, Edward D. Young   +5 more
wiley   +1 more source

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

Drake Equation for the Multiverse: From the String Landscape to Complex Life

, 2010
It is argued that selection criteria usually referred to as "anthropic conditions" for the existence of intelligent (typical) observers widely adopted in cosmology amount only to preconditions for primitive life.
Baross J. A., Barrow J. D., Bousso R., Bousso R., Buick R., Drake F. D., Gleiser M., Gleiser M., Joyce G. F., Linde A., M. GLEISER, Prigogine I., Smolin L., Susskind L., Ward P. D., Weinberg S., Wilczek F.   +16 more
core   +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

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

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

Heroical Apatheism: Mala Fide Bootstrapping Obligations [PDF]

, 2018
Discussions on hypothetical gods virtually always focus on the latter’s existence or nonexistence. However, this is only the secondary question. Heroical apatheism distinguishes these questions from the primary question, which pertains to the importance ...
Von Hegner, Ian
core   +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