Results 11 to 20 of about 389,444 (301)
THE CHEMICAL EVOLUTION OF PHOSPHORUS [PDF]
The Astrophysical Journal, 2014 Phosphorus is one of the few remaining light elements for which little is known about its nucleosynthetic origin and chemical evolution, given the lack of optical absorption lines in the spectra of long-lived FGK-type stars. We have identified a P I doublet in the near-ultraviolet (2135/2136 A) that is measurable in stars of low metallicity.
Heather R. Jacobson +5 more
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Natural selection in chemical evolution [PDF]
Journal of Theoretical Biology, 2007 We propose that chemical evolution can take place by natural selection if a geophysical process is capable of heterotrophic formation of liposomes that grow at some base rate, divide by external agitation, and are subject to stochastic chemical avalanches, in the absence of nucleotides or any monomers capable of modular heredity.
Fernando, Chrisantha, Rowe, Jonathan
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On the Galactic chemical evolution of sulfur [PDF]
Astronomy & Astrophysics, 2004 Accepted by A&A, 12 pages.
Ryde, N., Lambert, D. L.
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Retrocausality in Quantum Phenomena and Chemical Evolution
Information, 2016 The interplay between retrocausality and the time-reversal symmetry of the dynamical law of quantum mechanics underscores the significance of the measurement dynamics with the use of indivisible and discrete quantum particles to be mediated.
Koichiro Matsuno
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2D chemical evolution models [PDF]
, 2023 Context. According to observations and numerical simulations, the Milky Way could exhibit several spiral-arm modes of various pattern speeds, with the slower patterns located at larger galactocentric distances. Aims. Our aim is to quantify the effects of
I. Minchev +19 more
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Modelling the Chemical Evolution [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractAdvanced observational facilities allow to trace back the chemical evolution of the Universe, on the one hand, from local objects of different ages and, secondly, by direct observations of redshifted objects. The chemical enrichment serves as one of the cornerstones of cosmological evolution.
Recchi, Simone, Hensler, Gerhard
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Origin of Life: The Point of No Return
Life, 2020 Origin of life research is one of the greatest scientific frontiers of mankind. Many hypotheses have been proposed to explain how life began. Although different hypotheses emphasize different initial phenomena, all of them agree around one important ...
Dimiter Kunnev
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The chemical evolution of IC 10 [PDF]
Astronomy and Astrophysics, 2010 Dwarf irregular galaxies are relatively simple unevolved objects where it is easy to test models of galactic chemical evolution. We attempt to determine the star formation and gas accretion history of IC10, a local dwarf irregular for which abundance, gas, and mass determinations are available. We apply detailed chemical evolution models to predict the
Yin J. +5 more
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THE PROTOBIOLOGICAL THEORY OF CEILINGS AND FLOORS, OR CHEMICAL EVOLUTION AS A PLANETARY PROCESS [PDF]
Filozofia i NaukaThe 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
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, 2008 In this series of lectures we first describe the basic ingredients of galactic chemical evolution and discuss both analytical and numerical models. Then we compare model results for the Milky Way, Dwarf Irregulars, Quasars and the Intra-Cluster- Medium with abundances derived from emission lines.
Horst Rauchfuss, Terence N. Mitchell
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