Results 31 to 40 of about 8,132,244 (286)

A High-Pressure, High-Temperature Flow Reactor Simulating the Hadean Earth Environment, with Application to the Pressure Dependence of the Cleavage of Avocado Viroid Hammerhead Ribozyme

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, Mari Ogawa, Noriko Konagaya, Yoshimi Maruoka, Jean-François Lambert, Louis M. P. Ter-Ovanessian, Jacques Vergne, Guy Hervé, Marie-Christine Maurel   +8 more
doaj   +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, Patrouix, Julien, Döring, Volker, Herdewijn, Piet, Tricot, Sabine, Cruveiller, Stéphane, Bouzon, Madeleine, Mutzel, Rupert   +7 more
openaire   +4 more sources

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

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

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

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 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

The Chemical Evolution of the Galaxy [PDF]

Symposium - International Astronomical Union, 1985
Over the last few years, our picture of the chemical evolution of the Galaxy has changed substantially. These changes are of interest because chemical evolution provides a common point of contact for most astrophysical processes of importance to galaxy evolution.
openaire   +1 more source