Results 61 to 70 of about 35,920 (261)
Reaction Networks For Interstellar Chemical Modelling: Improvements and Challenges
, 2010 We survey the current situation regarding chemical modelling of the synthesis of molecules in the interstellar medium. The present state of knowledge concerning the rate coefficients and their uncertainties for the major gas-phase processes -- ion ...
Agundez, M. +12 more
core +3 more sources
Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight
Experimental Physiology, EarlyView.Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley +1 more source
Molecules in Interstellar Space? [PDF]
Nature, 1937 IN a recent note in NATURE1, and more in detail elsewhere2, Dr. T. Dunham, jun., has described his discovery of more interstellar lines due to K ( 7699.03), Ca ( 4227), Ti+ ( 3242.6 and others) and a number of other lines the origin of which has not yet been traced ( 3957.7, 4300.3, 4232.6). We have to add to these Merrill's interstellar lines3 ( 5780,
openaire +1 more source
Over the possible role of metal atom clusters in cosmochemistry and in the origin of life
Revista de Química, 1992 We present here the hypothesis of a possible relationship between metal atom clusters and the formation of organic molecules in the interstellar medium and on small bodies as a possible pathway to the origin of such molecules.
Silvio Dioses Castro, Richard Korswagen
doaj
Disk and Envelope Streamers of the GGD 27-MM1 Massive Protostar
The Astrophysical Journal, 2023 We present new Atacama Large Millimeter/submillimeter Array 0.98 mm observations of the continuum emission and several molecular lines toward the high-mass protostellar system GGD 27-MM1, driving the HH 80-81 radio jet.
M. Fernández-López +6 more
doaj +1 more source
Dependence of Chemical Abundance on the Cosmic-Ray Ionization Rate in IC 348
The Astrophysical Journal, 2023 Ions (e.g., ${{\rm{H}}}_{3}^{+}$ , H _2 O ^+ ) have been used extensively to quantify the cosmic-ray ionization rate (CRIR) in diffuse sightlines. However, measurements of the CRIR in low-to-intermediate density gas environments are rare, especially when
Gan Luo +10 more
doaj +1 more source
, 2011 Up to now, no laboratory-based study has investigated polycyclic aromatic hydrocarbon (PAH) species as potential carriers of both the diffuse interstellar bands (DIBs) and the 2175 A UV bump.
Bouwman +24 more
core +1 more source
The Astronomical JournalDeuterium fractionation, as studied through mono-deuterated methanol, is frequently used as a diagnostic tool to trace the physical conditions and chemical evolution of interstellar sources. This study investigates methanol deuteration in the disk around
Shaoshan Zeng +5 more
doaj +1 more source
Isotopic fractionation in interstellar molecules [PDF]
Proceedings of the International Astronomical Union, 2017 AbstractThe level of isotopic fractionation in molecules provides insights into their formation environments and how they formed. In this article, we review hydrogen and nitrogen isotopic fractionation in low-mass star-forming regions. Interstellar molecules are significantly enriched in deuterium.
openaire +3 more sources
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 +7 more
wiley +1 more source