Results 21 to 30 of about 389,444 (301)
Life, 2022 The RNA world hypothesis suggests that chemical networks consisting of functional RNA molecules could have constructed a primitive life-like system leading a first living system.
Kunio Kawamura +8 more
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Stellar Chemical Evolution [PDF]
Symposium - International Astronomical Union, 1997 One of the major achievements of astrophysics has been the demonstration that most of the chemical elements have been synthesized in stars: nucleosynthesis calculations of homogeneous and inhomogeneous big bang cosmologies show that, in comparison with the most metal-poor stars currently known, essentially no elements heavier than B existed at the era ...
openaire +1 more source
Chemical Evolution of a Bacterium’s Genome [PDF]
Angewandte Chemie International Edition, 2011 We set out to develop a generic technology for evolving the chemical constitution of microbial populations by using the simplest possible algorithm. Extant living cells polymerize a restricted set of nucleic acid precursors, namely, four nucleoside triphosphates (UTP, CTP, ATP, GTP) and four deoxynucleoside triphosphates (dTTP, dCTP, dATP, dGTP ...
Marlière, Philippe +7 more
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Origin of the Reductive Tricarboxylic Acid (rTCA) Cycle-Type CO2 Fixation: A Perspective
Life, 2017 The reductive tricarboxylic acid (rTCA) cycle is among the most plausible candidates for the first autotrophic metabolism in the earliest life. Extant enzymes fixing CO2 in this cycle contain cofactors at the catalytic centers, but it is unlikely that ...
Norio Kitadai +2 more
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Coupling Chemical Evolution with SPH [PDF]
, 2001 We present a new statistical algorithm of Chemical Evolution implemented into the Tree-SPH code developed by Lia & Carraro (2000)
Portinari,L, CARRARO, GIOVANNI, Lia,C
core +1 more source
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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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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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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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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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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