Results 21 to 30 of about 1,642,984 (314)

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, AM Khokhlov, B Paczynski, C Sneden, D Argast, F-K Thielemann, G Nelemans, H Umeda, H Umeda, I Hachisu, I Hachisu, J Sollerman, K Iwamoto, K Iwamoto, K Iwamoto, K Maeda, K Maeda, K Nomoto, K Nomoto, K Nomoto, LAJ Blake, LM Germany, M Hashimoto, Nakamura, P Podsiadlowski, PA Mazzali, S Nagataki, SG Ryan, Shigeyama. T., amp Tsujimoto, T, TG Tsuru, V Bromm, WD Arnett, WN Brandt   +32 more
core   +2 more sources

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
doaj   +1 more source

Evolution before genes

Biology Direct, 2012
Background Our current understanding of evolution is so tightly linked to template-dependent replication of DNA and RNA molecules that the old idea from Oparin of a self-reproducing 'garbage bag' ('coacervate') of chemicals that predated fully-fledged ...
Vasas Vera, Fernando Chrisantha, Santos Mauro, Kauffman Stuart, Szathmáry Eörs   +4 more
doaj   +1 more source

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
doaj   +1 more source

Chiral and Molecular Recognition through Protonation between Aromatic Amino Acids and Tripeptides Probed by Collision-Activated Dissociation in the Gas Phase

Molecules, 2018
Chiral and molecular recognition through protonation was investigated through the collision-activated dissociation (CAD) of protonated noncovalent complexes of aromatic amino acid enantiomers with l-alanine- and l-serine-containing tripeptides using a ...
Akimasa Fujihara, Hikaru Inoue, Masanobu Sogi, Michiko Tajiri, Yoshinao Wada   +4 more
doaj   +1 more source

Mapping the Galactic Metallicity Gradient with Open Clusters: The State-of-the-Art and Future Challenges

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, Laura Magrini, Katia Cunha   +2 more
doaj   +1 more source

Refueling the Magic Furnace: Kilonova 2017 Rewrites the Story of Element Origins

Journal of Big History, 2018
For more than half a century, we have understood element creation in the stars—described in Marcus Chown’s colorful image as “the magic furnace.” From 1958 until 2017, supernova explosions were thought to be the primary site of element creation above ...
Barry Woods
doaj   +1 more source

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, Nur Fariza M. Shaipulah, Gaik Ee Lee, S. Robbert Gradstein, Yoshinori Asakawa, Yosie Andriani, Arifullah Mohammed, Nik Norhazrina, Poh Wai Chia, Muhammad Zulhimi Ramlee   +9 more
doaj   +1 more source

Chemical Evolution of the Juvenile Universe [PDF]

, 2009
Only massive stars contribute to the chemical evolution of the juvenile universe corresponding to [Fe/H]
Barklem, Burbidge, Cayrel, François, G. J. Wasserburg, Hill, Käppeler, Qian, Woosley, Y.-Z. Qian   +9 more
core   +2 more sources

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