Results 31 to 40 of about 15,759 (253)
Bulk chemical compositions of Antarctic meteorites in the NIPR collection
, 2018 Bulk chemical compositions of meteorites were traditionally analyzed by wet chemical analysis, and NIPR has data for 1162 meteorites as of September 2017. We discuss the classification of meteorites on the basis of these data.
N. Imae +9 more
core +1 more source
Evidence for silicate dissolution on Mars from the Nakhla meteorite [PDF]
, 2013 Veins containing carbonates, hydrous silicates and sulphates that occur within and between grains of augite and olivine in the Nakhla meteorite are good evidence for the former presence of liquid water in the Martian crust.
Smith, C.L. +8 more
core +1 more source
Nature Communications, 2020 This manuscript tackles the origin of organic molecules in carbonaceous meteorites. Identifying hexamethylenetetramine in three carbonaceous meteorites, the authors propose formation from ammonia and formaldehyde by photochemical and thermal reactions in
Yasuhiro Oba +6 more
doaj +1 more source
ChemPhysChem, Volume 26, Issue 6, March 15, 2025.The ionization of anthracene, acridine, and phenazine has been explored, along with the removal of one and two hydrogen atoms, to provide valuable information for astrochemists and to understand the behavior of the resulting structures and their electronic reorganization. Abstract In this study, we systematically explored the stability and isomerism of
Khaldia Zghida +3 more
wiley +1 more source
Variations in the Magnetic Properties of Meteoritic Cloudy Zone
Geochemistry, Geophysics, Geosystems, 2020 Iron and stony‐iron meteorites form the Widmanstätten pattern during slow cooling. This pattern is composed of several microstructures whose length‐scale, composition and magnetic properties are dependent upon cooling rate.
Claire I. O. Nichols +7 more
doaj +1 more source
A Nonlinear Quantitative Model for Measuring Concentration Ratios From Raman Intensities
Journal of Raman Spectroscopy, EarlyView.Estimating concentration from Raman intensity ratios is complicated by cross‐contributions from overlapping peaks, causing measured ratios to deviate from the linear behavior assumed in conventional quantitative models. This nonlinear method fully accounts for cross‐contributions, allowing estimation of concentration over several orders of magnitude ...
Joseph Razzell Hollis
wiley +1 more source
Molecules, 2023 Experimental studies of the degradation of two ribonucleosides (guanosine and uridine) were carried out by making use of mechanochemistry. Mechanochemical experiments reveal the decomposition of guanosine and uridine, promoted by nickel(II) and carbonate
Gustavo P. Maia +3 more
doaj +1 more source
Proceedings of the National Academy of Sciences, 2011 Primitive meteorites, interplanetary dust particles, and comets contain dust grains that formed around stars that lived their lives before the solar system formed. These remarkable objects have been intensively studied since their discovery a little over twenty years ago and they provide samples of other stars that can be studied in the laboratory in ...
openaire +2 more sources
Reidite Formation From Zircon Subjected to 20, 40, and 60 GPa Shock Experiments
Journal of Raman Spectroscopy, EarlyView.Structure disordering as a result of shock pressure: In zircon shocked from 20 to 60 GPa, the shock‐induced structural disorder increases with increasing shock pressure (gray area). Shock disorder of zircon is an integral part of its transformation to reidite: Reidite occurs after amorphous material.
Dmitry A. Zamyatin, Elizaveta Kovaleva
wiley +1 more source