Results 51 to 60 of about 2,145,468 (291)

Hydro-chemical study of the evolution of interstellar pre-biotic molecules during the collapse of molecular clouds

, 2012
One of the stumbling blocks for studying the evolution of interstellar molecules is the lack of adequate knowledge of the rate co-efficients of various reactions which take place in the Interstellar medium and molecular clouds.
Ankan Das, Boogert, Chakrabarti, Chakrabarti, Chakrabarti, Cuppen, Das, Fuente, Gibb, Guelin, Ioppolo, Kuan, Liton Majumdar, Sandip K. Chakrabarti, Snyder, Sonali Chakrabarti, Woon   +16 more
core   +1 more source

Radiolysis of ammonia-containing ices by energetic, heavy and highly charged ions inside dense astrophysical environments [PDF]

, 2009
Deeply inside dense molecular clouds and protostellar disks, the interstellar ices are protected from stellar energetic UV photons. However, X-rays and energetic cosmic rays can penetrate inside these regions triggering chemical reactions, molecular ...
Balanzat, E., Boduch, P., da Silveira, E. F., Domaracka, A., Duarte, E. Seperuelo, Pilling, S., Rothard, H.   +6 more
core   +3 more sources

Homoleptic Bismuth Alkynes: Isolable Reagents for Selective Alkynyl Radical Transfer

Angewandte Chemie, Volume 138, Issue 4, 22 January 2026.
The first series of fully characterized homoleptic alkynyl bismuth compounds Bi(C≡CR)3 is presented. Facile homolytic Bi–C bond cleavage grants access to alkynyl radicals, which have been employed in selective C–X bond formation (X = C, B, Se, Te). This complements existing strategies for alkynyl radical generation as it proceeds under mild and purely ...
Gargi Kundu, Felix Debbeler, Sascha Reith, Frerik Wurm, Alicia Casitas, Crispin Lichtenberg   +5 more
wiley   +2 more sources

Molecular Hydrogen Formation via Vibrational Excitation of Partially Superhydrogenated Pyrenes

The Astrophysical Journal
While polycyclic aromatic hydrocarbons (PAHs) are now accepted to be abundant in interstellar space, the abundance and influence of superhydrogenated PAHs (HPAHs) in the interstellar medium (ISM) are still under investigation.
Frederik Doktor S. Simonsen, Rijutha Jaganathan, Julianna Palotás, Zeyuan Tang, Bjørk Hammer, Jos Oomens, Liv Hornekær   +6 more
doaj   +1 more source

Molecules, ices and astronomy [PDF]

, 2007
Molecules in interstellar gas and in interstellar ices play a fundamental role in astronomy. However, the formation of the simplest molecule, molecular hydrogen, is still not fully understood.
Brown, W A, Price, S D, Rawlings, J M C, Viti, S, Williams, D A   +4 more
core   +1 more source

Energy Landscapes in Chemical Reactions and Transport

ChemPhysChem, Volume 26, Issue 6, March 15, 2025.
Kinetics/dynamics of chemical reactivity and transport of chemical species in a solid are both determined by the energy landscape in which they take place. Discussing common grounds but also distinct differences may help in advancing the understanding in both fields.
Karl‐Michael Weitzel
wiley   +1 more source

Data Sharing and Information Security Under the Software‐Defined Network

IET Networks, Accepted Article.
To sum up, the big data sharing platform based on SDN can quickly and effectively respond to the data requests of end users, and the information security protection system can detect the platform in real time to prevent it from being intruded and damaged, which largely protects the information security of the platform." cd_value_code="text Abstract ...
Jianqiao Sheng, Yuan Fang, Ming Li, Liang Zhang, Jingxuan Xu, Xin Ding   +5 more
wiley   +1 more source

The futuristic manifolds of REM sleep

Journal of Sleep Research, Volume 34, Issue 2, April 2025.
Summary Since one of its first descriptions 70 years ago, rapid eye movement sleep has continually inspired and excited new generations of sleep researchers. Despite significant advancements in understanding its neurocircuitry, underlying mechanisms and microstates, many questions regarding its function, especially beyond the early neurodevelopment ...
Liborio Parrino, Ivana Rosenzweig
wiley   +1 more source

A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?

The Astrophysical Journal Supplement Series, 2023
We conducted observations of multiple HC _3 N ( J = 10−9, 12−11, and 16−15) lines and the N _2 H ^+ ( J = 1−0) line toward a large sample of 61 ultracompact (UC) H ii regions, through the Institut de Radioastronomie Millmétrique 30 m and the Arizona ...
Y. X. Wang, J. S. Zhang, H. Z. Yu, Y. Wang, Y. T. Yan, J. L. Chen, J. Y. Zhao, Y. P. Zou   +7 more
doaj   +1 more source

Nanodust in the Interstellar Medium in Comparison to the Solar System

, 2012
Nanodust, which undergoes stochastic heating by single starlight photons in the interstellar medium, ranges from angstrom-sized large molecules containing tens to thousands of atoms (e.g.
Li, Aigen, Mann, Ingrid
core   +1 more source