Results 71 to 80 of about 7,455 (223)

Geometric Stabilization of Biomolecular Chirality in Open Systems

Chirality, Volume 38, Issue 6, June 2026.
Entropic topology favors orientation‐preserving deformations in molecular configuration space, leading to a spontaneous statistical bias toward right‐handed α$$ \alpha $$‐helices. The figure illustrates how configurations with positive determinant (dextral) occupy a larger accessible volume of microstates, providing a purely geometric‐entropic ...
Vicente Domínguez‐Arca
wiley   +1 more source

Photochemistry and Astrochemistry: Photochemical Pathways to Interstellar Complex Organic Molecules

, 2017
The interstellar medium is characterized by a rich and diverse chemistry. Many of its complex organic molecules are proposed to form through radical chemistry in icy grain mantles. Radicals form readily when interstellar ices (composed of water and other
Oberg, Karin
core   +1 more source

ALMA Reveals Diverse Dust-to-gas Mass Ratios and Quenching Modes in Old Quiescent Galaxies

The Astrophysical Journal Letters
Recent discoveries of dust and molecular gas in quiescent galaxies (QGs) up to z ∼ 4 challenge the long-standing view that the interstellar medium depletes rapidly once star formation ceases, raising key questions of whether dust and gas coevolve in QGs,
G. Lorenzon, D. Donevski, A. W. S. Man, M. Romano, K. E. Whitaker, S. Belli, D. Liu, M. M. Lee, D. Narayanan, A. Long, I. Shivaei, A. Nanni, K. Lisiecki, P. Sawant, G. Rodighiero, I. Damjanov, Junais, R. Davé, C. Pappalardo, C. Lovell, M. Hamed   +20 more
doaj   +1 more source

Origin of Interstellar Molecules [PDF]

Progress of Theoretical Physics, 1973
It is concluded from a thermochemical calculation that the interstellar molecules in the compact H II regions may be formed in places of high temperature and high pressure. A possibility of the locations of molecular formation may be the prestellar atmospheres, but the atmospheres of late type stars are other possible candidates.
openaire   +1 more source

Tautomerization Kinetics of Thiouracils at Low Temperatures Driven Solely by Quantum‐Mechanical Tunnelling: Predictions of Suitable Candidates for Future Experiments

International Journal of Chemical Kinetics, Volume 58, Issue 6, Page 269-277, June 2026.
ABSTRACT In the past two decades numerous experiments have been conducted on the kinetics of reactions occurring at low temperatures on inert matrices. In particular, unimolecular proton‐transfer photo‐reactions of compounds containing a carbon–sulfur double bond, or thione group C═S, can lead to the formation of higher energy isomers or tautomers with
Judith Wurmel, John M. Simmie
wiley   +1 more source

Molecular Gas Morphological Analogs for the Milky Way

The Astrophysical Journal Letters
Complete catalogs of molecular clouds in the Milky Way allow analysis of the molecular medium and the star formation properties of the Milky Way that closely follows the method used for nearby galaxies.
Neal J. Evans II, Davide Elia, Keith Hawkins, Sophia Stuber, Jiayi Sun   +4 more
doaj   +1 more source

Light‐Activated Protein‐Imprinted Hydrogels Capable of Translating Protein Surface Accessibility Into Missing‐Peptide Footprints

Small Structures, Volume 7, Issue 6, June 2026.
Light‐activated protein‐imprinted PFPA‐functionalized hydrogels crosslink captured proteins and report protein surface accessibility as missing‐peptide patterns readable by standard LC‐MS/MS. Mass spectrometry (MS)‐based structural proteomics can reveal higher‐order structural features in complex biological samples, but many covalent footprinting and ...
Eisuke Kanao, Taichi Nihei, Kankichi Kako, Asato Maeda, Damla Ulker, Hiroshi Nishida, Kosuke Ogata, Mingdi Yan, Sergey Piletsky, Yasushi Ishihama, Takuya Kubo   +10 more
wiley   +1 more source

Photochemistry of interstellar molecules

, 1971
The photochemistry of two diatomic and eight polyatomic molecules is discussed quantitatively. For an interstellar molecule, the lifetime against photodecomposition depends upon the absorption cross section, the quantum yield or probability of ...
Stief, L. J.
core  

SYSTEMATIC THEORETICAL STUDY ON THE INTERSTELLAR CARBON CHAIN MOLECULES

, 2016
In an effort to further our interest in understanding the basic chemistry of interstellar molecules, here we carry out an extensive investigation of the stabilities of interstellar carbon chains; C-n, H2Cn, HCnN and CnX (X = N, O, Si, S, H, P, H-, N ...
Gorai, Prasanta, Etim, Emmanuel E., Etim, Emmanuel E, Arunan, Elangannan, Chakrabarti, Sandip K., Das, Ankan, Chakrabarti, Sandip K   +6 more
core   +1 more source

Cosmic Dust as a Prerequisite for the Formation of Complex Organic Molecules in Space?

The Astrophysical Journal
In cold, dense astrophysical environments dust grains are mixed with molecular ices. Chemistry in those dust/ice mixtures is determined by diffusion and reaction of molecules and radicals.
Alexey Potapov, Kilian Pollok, Falko Langenhorst, Martin McCoustra, Robin T. Garrod   +4 more
doaj   +1 more source