Results 21 to 30 of about 1,651,742 (317)
Prebiotic Chemistry: Geochemical Context and Reaction Screening
Life, 2013 The origin of life on Earth is widely believed to have required the reactions of organic compounds and their self- and/or environmental organization. What those compounds were remains open to debate, as do the environment in and process or processes by ...
Henderson James Cleaves
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Reactions of Graphene Nano-Flakes in Materials Chemistry and Astrophysics
Physchem, 2022 The elucidation of the mechanism of the chemical evolution of the universe is one of the most important themes in astrophysics. Polycyclic aromatic hydrocarbons (PAHs) provide a two-dimensional reaction field in a three-dimensional interstellar space ...
Hiroto Tachikawa, Tetsuji Iyama
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Hypernova Nucleosynthesis and Galactic Chemical Evolution [PDF]
, 2001 We study nucleosynthesis in 'hypernovae', i.e., supernovae with very large explosion energies ($ \gsim 10^{52} $ ergs) for both spherical and aspherical explosions.
AI Macfadyen +32 more
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Molecular Asymmetry in Prebiotic Chemistry: An Account from Meteorites
Life, 2016 Carbonaceous Chondrite (CC) meteorites are fragments of asteroids, solar planetesimals that never became large enough to separate matter by their density, like terrestrial planets.
Sandra Pizzarello
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Universe, 2022 In this paper, we make use of data collected for open cluster members by high-resolution spectroscopic surveys and programmes (i.e., APOGEE, Gaia-ESO, GALAH, OCCASO, and SPA). These data have been homogenised and then analysed as a whole.
Lorenzo Spina +2 more
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Uncertainties in Galactic Chemical Evolution Models [PDF]
, 2016 We use a simple one-zone galactic chemical evolution model to quantify the uncertainties generated by the input parameters in numerical predictions for a galaxy with properties similar to those of the Milky Way.
Côté, Benoit +6 more
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Volatile Organic Compounds of Bryophytes from Peninsular Malaysia and Their Roles in Bryophytes
Plants, 2022 Volatile emissions from 22 bryophyte species from Peninsular Malaysia were collected using a dynamic headspace technique and analyzed by gas chromatography–mass spectrometry (GC-MS).
Chin Wen Koid +9 more
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Filozofia i NaukaThe article presents the hypothesis of the origin of life. All the basic ideas of the 20th century research program in this area can be found there: the extrapolation of Darwinism into the area of chemical evolution, the influence of solar energy, the ...
Richard Krzymowski
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Chemical Evolution Tomorrow [PDF]
, 2002 The solar system is just one sample, though of course the most thoroughly studied sample, of cosmic chemistry. Some perspective on it can be gained from an overview of the chemical evolution of the Galaxy and Universe, how our knowledge of this evolution has developed, and what problems remain to be solved.
openaire +2 more sources
Life, 2022 Non-communicable diseases are those conditions to which causative infectious agents cannot readily be assigned. It is increasingly likely that at least some of these conditions are due to the breakdown of the previously mutualistic intestinal microbiota ...
David Smith +3 more
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