Results 71 to 80 of about 3,228 (211)

Laboratory surface astrochemistry experiments [PDF]

Review of Scientific Instruments, 2015
Although several research groups have studied the formation of H2 on interstellar dust grains using surface science techniques, few have explored the formation of more complex molecules. A small number of these reactions produce molecules that remain on the surface of interstellar dust grains and, over time, lead to the formation of icy mantles.
Frankland, Victoria, Rosu-Finsen, A, Lasne, J, Collings, MP, McCoustra, MRS   +4 more
openaire   +5 more sources

Theoretical approaches for studying Astrochemistry

EPJ Web of Conferences, 2012
The most popular ab initio theoretical approaches that are used to study the gas phase astrochemical reactivity are presented. The methods that are needed for the electronic calculation and the statistical approaches that are used for determining the ...
Talbi D.
doaj   +1 more source

Atomistic Modeling of Methyl Formate and Glycolaldehyde Formation on Interstellar Dirty Ice Mantles via a “Radical + Ice” Mechanism

ChemPlusChem, Volume 90, Issue 11, November 10, 2025.
The presence of interstellar complex organic molecules (COMs) has been baffling astrochemists for a long time. Methyl formate and glycolaldehyde are widely detected but their abundances mismatch kinetic astrochemical model predictions. Here, the formation of these two COMs is characterized onto a mixed ice surface, highlighting the importance of ...
Jessica Perrero, Stefano Pantaleone, Piero Ugliengo, Albert Rimola   +3 more
wiley   +1 more source

Radioprotective Efficacy of Jujube Aqueous Extract and Arbutin: Synergistic Antioxidant and Anti‐Apoptotic Mechanisms in Radiation Injury

Food Science &Nutrition, Volume 13, Issue 10, October 2025.
JAE demonstrates potent antioxidant activity and protects against radiation‐induced lung injury. Proteomic reveals JAE modulates apoptosis and oxidative stress pathways for radioprotection. JAE demonstrates broad cellular protection against UVC damage in lung and skin cell models.
Liping Wang, Hui Yang, Xuchen Zhou, Yufen Zhao, Long Li, Ning Wang   +5 more
wiley   +1 more source

Computational challenges in Astrochemistry [PDF]

, 2017
Cosmic evolution is the tale of progressive transition from simplicity to complexity. The newborn universe starts with the simplest atoms formed after the Big Bang and proceeds toward ‘astronomical complex organic molecules’ (astroCOMs).
Puzzarini, Cristina, Cristina Puzzarini, Bloino, Julien, Malgorzata Biczysko, Biczysko, Malgorzata, Julien Bloino   +5 more
core   +1 more source

UV–Vis Spectra of Carbonic Acid: Rationalizing Experimental Redshifts between Monomer and Bulk based on (H2CO3)n Calculations

ChemPhysChem, Volume 26, Issue 18, September 19, 2025.
In bulk carbonic acid (e.g., in interstellar icy dust grains) cluster formation produces two distinct UV‐Vis spectral features redshifted by ≈2 eV (25 nm) and by ≈5 eV (80 nm) compared to gas phase single molecule carbonic acid 's adiabatic ionization energy. Theory and experiment were used to investigate the origin of these shifts.
Dennis F. Dinu, Bastian Klein, Chaojiang Zhang, Radu A. Talmazan, Thomas Loerting, Hinrich Grothe, Ralf I. Kaiser, Maren Podewitz   +7 more
wiley   +1 more source

Mellitic Acid as a Stable Abiotic Precursor for Liquid‐Liquid Phase Separation: An RNA‐Independent Pathway for Prebiotic Compartmentalization

Chemistry – A European Journal, Volume 31, Issue 52, September 16, 2025.
Evidence is presented that prebiotically accessible mellitic (benzenehexacarboxylic) acid (MAc) is forming liquid droplets with short poly‐L‐lysine. The capacity of MAc to induce liquid‐liquid phase separation with short oligocations, along with abiotic synthesis routes, makes MAc a viable candidate for an ingredient of early prebiotic membraneless ...
Robert Dec, Michel W Jaworek, Matylda Wacławska, Wojciech Dzwolak, Roland Winter   +4 more
wiley   +1 more source

Ion Source Complementarity for Characterization of Complex Organic Mixtures Using Fourier Transform Mass Spectrometry: A Review

Mass Spectrometry Reviews, Volume 44, Issue 5, Page 808-829, September/October 2025.
ABSTRACT Complex organic mixtures are found in many areas of research, such as energy, environment, health, planetology, and cultural heritage, to name but a few. However, due to their complex chemical composition, which holds an extensive potential of information at the molecular level, their molecular characterization is challenging.
Charlotte Mase, Maxime Sueur, Hélène Lavanant, Christopher Paul Rüger, Pierre Giusti, Carlos Afonso   +5 more
wiley   +1 more source

Infrared spectroscopy of the ν3 band of C3 in helium droplets

AIP Advances, 2018
The C3 molecule is an important species known to participate in key chemical reactions in combustion and astrochemistry. Its occurrence in environments of interest, its intramolecular physics, and its intermolecular reactivity have been areas of ...
Barbara A. Harruff-Miller, Christopher E. Bunker, William K. Lewis   +2 more
doaj   +1 more source

The Genuine Carbene Conundrum

Chemistry – A European Journal, Volume 31, Issue 44, August 7, 2025.
From fleeting intermediates to well‐defined molecular structures, carbenes (neutral divalent carbon) remind us that the most reactive ideas often make a large impact. Despite their wide‐ranging applications, the direct characterization of these reactive species remains a persistent experimental challenge.
Bethany Sawyer, Jesse. L. Peltier, Rodolphe Jazzar   +2 more
wiley   +1 more source