Results 21 to 30 of about 6,446,269 (330)
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
openaire +4 more sources
Chemical evolution with rotating massive star yields II. A new assessment of the solar s- and r- process components [PDF]
Monthly notices of the Royal Astronomical Society, 2019 The decomposition of the Solar system abundances of heavy isotopes into their s- and r- components plays a key role in our understanding of the corresponding nuclear processes and the physics and evolution of their astrophysical sites. We present a new
N. Prantzos +4 more
semanticscholar +1 more source
Life, 2022 Researchers have suggested that the condensation of low-molecular-weight aldehydes under basic conditions (e.g., pH > 11) is the prebiotic reaction responsible for the abiotic formation of carbohydrates.
Claudio Alejandro Fuentes-Carreón +3 more
doaj +1 more source
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
openaire +3 more sources
The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2019 In this Letter, we present the first chemical evolution model for Enceladus, alias the Gaia Sausage, to investigate the star formation history of one of the most massive satellites accreted by the Milky Way during a major merger event.
F. Vincenzo +6 more
semanticscholar +1 more source
Chemical evolution with rotating massive star yields - I. The solar neighbourhood and the s-process elements [PDF]
, 2018 We present a comprehensive study of the abundance evolution of the elements from H to U in the Milky Way halo and local disk. We use a consistent chemical evolution model, metallicity dependent isotopic yields from low and intermediate mass stars and ...
N. Prantzos +5 more
semanticscholar +1 more source
Molecular Basis for Chemical Evolution of Flavones to Flavonols and Anthocyanins in Land Plants1
Plant Physiology, 2020 Functional flavone synthase Is in liverworts are evolutionarily linked to seed plant flavanone 3β-hydroxylases, and bifunctional enzymes likely represent a transition between the two enzymes.
Dan Li +9 more
semanticscholar +1 more source
Geochemical evolution of saline formation water of the Mozduran gas reservoir [PDF]
Journal of Stratigraphy and Sedimentology Researches, 2018 The Mozduran gas reservoir in the Khangiran gas-field is formed in the Kopet-Dagh sedimentary basin in the form of sequential sequences of clastic and carbonate sediments of the old sea water.
mahdi miri +3 more
doaj +1 more source
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
openaire +3 more sources
The Chemical Evolution of Carbon, Nitrogen, and Oxygen in Metal-poor Dwarf Galaxies [PDF]
Astrophysical Journal, 2019 Ultraviolet nebular emission lines are important for understanding the time evolution and nucleosynthetic origins of their associated elements, but the underlying trends of their relative abundances are unclear.
D. Berg +4 more
semanticscholar +1 more source