Results 21 to 30 of about 7,581,489 (212)
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 ...
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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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Pseudo Natural Products—Chemical Evolution of Natural Product Structure
Angewandte Chemie, 2021 Pseudo‐natural products (PNPs) combine natural product (NP) fragments in novel arrangements not accessible by current biosynthesis pathways. As such they can be regarded as non‐biogenic fusions of NP‐derived fragments.
George Karageorgis +4 more
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Enzymatic synthesis and nanopore sequencing of 12-letter supernumerary DNA
Nature Communications, 2023 The 4-letter DNA alphabet (A, T, G, C) as found in Nature is an elegant, yet non-exhaustive solution to the problem of storage, transfer, and evolution of biological information.
Hinako Kawabe +11 more
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A Bird's-Eye View of Enzyme Evolution: Chemical, Physicochemical, and Physiological Considerations.
Chemical Reviews, 2018 Enzymes catalyze a vast range of reactions. Their catalytic performances, mechanisms, global folds, and active-site architectures are also highly diverse, suggesting that enzymes are shaped by an entire range of physiological demands and evolutionary ...
D. Davidi +4 more
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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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Frontiers in Physiology, 2021 Larvae of the turnip sawfly Athalia rosae are a pest of Brassicacae plants, as their feeding can cause defoliation of various crops of economic importance.
Caroline Zanchi +5 more
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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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Nano Convergence, 2017 Surface force analysis with atomic force microscope (AFM) in which a single amino acid residue was mounted on the tip apex of AFM probe was carried out for the first time at the molecular level on titanium dioxide (TiO2) as a representative mineral ...
Narangerel Ganbaatar +3 more
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Nature Communications, 2018 The citric acid cycle (TCA) is a fundamental metabolic pathway to release stored energy in living organisms. Here, the authors report two linked cycles of reactions that each oxidize glyoxylate into CO2 and generate intermediates shared with the modern ...
Greg Springsteen +4 more
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