Results 81 to 90 of about 739 (181)

Autonomous Development of Compositional Diversity in Self‐Spreading Flat Protocells

ChemSystemsChem, Volume 6, Issue 6, November 2024.
We present a feasible pathway leading to a rudimentary type of protocell diversity and speciation based on the fusion of flat giant unilamellar lipid vesicles on solid surfaces. Abstract An experimental pathway to the spontaneous generation of compositionally diverse synthetic protocells is presented.
İrep Gözen, Stephen Mann, Aldo Jesorka
wiley   +1 more source

THE PROTOBIOLOGICAL THEORY OF CEILINGS AND FLOORS, OR CHEMICAL EVOLUTION AS A PLANETARY PROCESS [PDF]

Filozofia i Nauka
The article presents a modern protobiological theory based on the classical archetype. It connects the issues of origins of life with the theory of the hierarchy of matter and recognizes that error correction occurs within hierarchical and dynamic living
Alicja Kubica
doaj   +1 more source

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

Sustainability of Transient Kinetic Regimes and Origins of Death [PDF]

Sci. Rep. 6, 20562 (2016), 2015
It is generally recognized that a distinguishing feature of life is its peculiar capability to avoid equilibration. The origin of this capability and its evolution along the timeline of abiogenesis is not yet understood. We propose to study an analog of this phenomenon that could emerge in non-biological systems.
arxiv   +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

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

Enhanced interplanetary panspermia in the TRAPPIST-1 system [PDF]

PNAS, 114, 6689 (2017), 2017
We present a simple model for estimating the probability of interplanetary panspermia in the recently discovered system of seven planets orbiting the ultracool dwarf star TRAPPIST-1, and find that panspermia is potentially orders of magnitude more likely to occur in the TRAPPIST-1 system compared to the Earth-to-Mars case.
arxiv   +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

Atmospheric escape from the TRAPPIST-1 planets and implications for habitability [PDF]

Proceedings of the National Academy of Sciences, Vol. 115, 260-265 (2018), 2017
The presence of an atmosphere over sufficiently long timescales is widely perceived as one of the most prominent criteria associated with planetary surface habitability. We address the crucial question as to whether the seven Earth-sized planets transiting the recently discovered ultracool dwarf star TRAPPIST-1 are capable of retaining their ...
arxiv   +1 more source