Results 91 to 100 of about 782,637 (367)

Organic Reactivity Matters for the Emergence of Life: Kinetic Barriers and Molecular Diversity Are Suggested as Crucial Factors by Emerging Autonomous System Models

ChemSystemsChem, EarlyView.
Self‐organisation may result from organic systems fed with free energy provided that reactivity becomes a determining factor. The propensity of carbon to form covalent bonds can give rise to kinetically stable thermodynamically activated compounds possibly undergoing non‐linear kinetic processes.
Robert Pascal
wiley   +1 more source

Mercury's Internal Structure [PDF]

, 2018
We describe the current state of knowledge about Mercury's interior structure. We review the available observational constraints, including mass, size, density, gravity field, spin state, composition, and tidal response. These data enable the construction of models that represent the distribution of mass inside Mercury.
arxiv   +1 more source

Lava Worlds: From Early Earth to Exoplanets [PDF]

, 2020
The magma ocean concept was first conceived to explain the geology of the Moon, but hemispherical or global oceans of silicate melt could be a widespread "lava world" phase of rocky planet accretion, and could persist on planets on short-period orbits around other stars. The formation and crystallization of magma oceans could be a defining stage in the
arxiv   +1 more source

Setting the stage for plant–soil feedback: Mycorrhizal influences over conspecific recruitment, plant and fungal communities, and coevolution

Journal of Ecology, Volume 113, Issue 6, Page 1327-1344, June 2025.
In this review, the authors summarize the mechanisms that generate different plant–soil‐microbe interactions among trees associated with arbuscular (AM) and ectomycorrhizal (ECM) fungi. The authors focus on a trait‐based framework describing how these groups interact with pathogens and saprotrophs, as well as soil carbon and nutrients, and discuss the ...
Andrew C. Eagar, Princess H. Abu, Megan A. Brown, Sara M. Moledor, Kurt A. Smemo, Richard P. Phillips, Andrea L. Case, Christopher B. Blackwood   +7 more
wiley   +1 more source

When did Life Likely Emerge on Earth in an RNA-First Process? [PDF]

19. Benner, S.A., Bell, E.A., Biondi, E., Brasser, R., Carell, T., Kim, H-J., Mojzsis, S.J., Omran, A., Pasek, M.A., and Trail, D. (2020) When did Life Likely Emerge on Earth in an RNA-First Process? ChemSystemsChem 2, e1900035, 2019
The widespread presence of ribonucleic acid (RNA) catalysts and cofactors in Earth's biosphere today suggests that RNA was the first biopolymer to support Darwinian evolution. However, most "path-hypotheses" to generate building blocks for RNA require reduced nitrogen-containing compounds not made in useful amounts in the CO2-N2-H2O atmospheres of the ...
arxiv   +1 more source

For special purposes only: Ceramic casting moulds from the late Bronze and Early Iron Age metallurgical workshop in Grzybiany (SW Poland)

Archaeometry, Volume 67, Issue 2, Page 482-501, April 2025.
Abstract Ceramic moulds are regarded as highly specialised, refractory tools used in metallurgy, yet their production process still needs clarification. Our research aimed to characterise the stages of operational chains applied in mould manufacture. The evidence comes from the Late Bronze and Early Iron Age lake settlement in Grzybiany in SW Poland ...
Wojciech Bartz, Kamil Nowak, Tomasz Stolarczyk, Justyna Baron   +3 more
wiley   +1 more source

Identification of the featured-element in fine road dust of cities with coal contamination by geochemical investigation and isotopic monitoring

Environment International, 2021
The exploitation of coal releases large amounts of contaminants into the environment. However, the featured pollutants of coal utilization as well as the scope and degree of their impact remain to be revealed.
Yuan Liu, Guijian Liu, Balal Yousaf, Chuncai Zhou, Xiaofei Shen   +4 more
doaj  

Arctic Tectonics and Volcanism: a multi-scale, multi-disciplinary educational approach [PDF]

Geoscience Communication
Geologically, the Arctic is one of the least-explored regions of Earth. Obtaining data in the high Arctic is logistically, economically, and environmentally expensive, but the township of Longyearbyen (population of 2617 as of 2024) at 78° N represents a
K. Senger, K. Senger, G. Shephard, G. Shephard, F. Ammerlaan, F. Ammerlaan, O. Anfinson, P. Audet, B. Coakley, V. Ershova, J. I. Faleide, S.-A. Grundvåg, S.-A. Grundvåg, R. K. Horota, K. Iyer, J. Janocha, J. Janocha, M. Jones, M. Jones, A. Minakov, M. Odlum, A. Sartell, A. Sartell, A. Schaeffer, D. Stockli, M. A. Vander Kloet, M. A. Vander Kloet, C. Gaina   +27 more
doaj   +1 more source

Episodic Lithospheric Deformation in Eastern Tibet Inferred From Seismic Anisotropy

Geophysical Research Letters, 2020
Mechanisms for uplift and deformation of the Tibetan Plateau remain vigorously debated; hypotheses include stepwise growth, distributed thickening, and crustal channel flow, each with a distinct anisotropic signature.
Xuewei Bao, Xiaodong Song, David W. Eaton, Yixian Xu, Hanlin Chen   +4 more
doaj   +1 more source

Tertiary-Quaternary intra-plate magmatism in Europe and its relationship to mantle dynamics [PDF]

, 2006
Anorogenic intra-plate magmatism was widespread in Europe from early Tertiary to Recent times, extending west to east from Spain to Bulgaria, and south to north from Sicily to northern Germany. Magmatism is spatially and temporally associated with Alpine-
Downes, Hilary, Wilson, M.
core   +1 more source