Results 91 to 100 of about 2,128 (220)
Lyα Processing of Solid-state Ethanolamine: Potential Precursors to Sugar and Peptide Derivatives
The Astrophysical JournalEthanolamine (EA), a key component of phospholipids, has recently been detected in the interstellar medium within molecular clouds. To understand this observation, laboratory studies of its formation and destruction are essential and should be ...
T. Suhasaria +6 more
doaj +1 more source
The chemistry of dense interstellar clouds
, 1991 The basic theme of this program is the study of molecular complexity and evolution in interstellar and circumstellar clouds incorporating the biogenic elements.
Irvine, W. M.
core
, 2017 In this paper we present calculated fractional abundances in dense interstellar clouds for selected atomic and molecular species using three different homogeneous, pseudo-time-dependent models discussed by Bettens, Lee, & Herbst (1995): the new ...
R. P.A. Bettens, E. Herbst, H.-H. Lee
core +1 more source
The Astrophysical JournalIn the denser and colder regions of the interstellar medium (ISM), gas-phase sulfur is depleted by 2 or 3 orders of magnitude with respect to its cosmic abundance. Thus, which species are the main carriers of sulfur is an open question.
Jessica Perrero +4 more
doaj +1 more source
Geomagnetism, volcanoes, global climate change, and predictability. A progress report
Annals of Geophysics, 1994 A model is investigated, by which the encounters of the solar system with dense interstellar clouds ought to trigger either geomagnetic field reversals or excursions, that produce extra electric currents within the Earth dynamo, that cause extra Joule's ...
G. P. Gregori
doaj +1 more source
Desorption of large molecules from grains in dense interstellar clouds
The Astrophysical Journal, 1991 Laboratory data on the nondestructive desorption of whole leucine (131 amu) molecules from surfaces induced by fast, heavy-ion bombardment are used to propose that heavy ions in the cosmic-ray flux may induce desorption of large molecules from the surfaces of grains in molecular, interstellar ...
JOHNSON RE +3 more
openaire +2 more sources
Chemical nitrogen fractionation in dense molecular clouds
, 2019 International audienceNitrogen-bearing molecules display variable isotopic fractionation levels in different astronomical environments such as in the interstellar medium or in the Solar system.
Wakelam, Valentine +3 more
core +1 more source
Multi-Wavelength View of Supernova Remnants
Acta Polytechnica CTU Proceedings, 2014 This contribution gives a very short overview on the emission of supernova remnants and the processes that are responsible for both the thermal and non-thermal origins of the emission, typically observed in radio, X-rays, and up to gamma-rays. We discuss
Manami Sasaki
doaj +1 more source
A reanalysis of the HCO(+)/HOC(+) abundance ratio in dense interstellar clouds
The Astrophysical Journal, 1986 New theoretical and experimental results have prompted a reinvestigation of the HCO+/HOC+ abundance ratio in dense interstellar clouds. These results pertain principally but not exclusively to the reaction between HOC+ and H2, which was previously calculated by DeFrees, McLean, and Herbst to possess a large activation energy barrier. New calculations,
M F, Jarrold +4 more
openaire +2 more sources
Dark ice chemistry in interstellar clouds
, 2020 This thesis is largely an experimental study on the formation of solid-state simple and complex organic molecules in the H2O-rich and CO-rich ice phases of dense interstellar clouds and dark cores. Astronomical ice observations are also presented and are
Qasim, D.N.
core