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Heterogeneous radiolysis of urea. Implications in astrobiology and prebiotic chemistry

100%
Abigail E. Cruz-Hernández, A. E., Colin-Garcia M., Heredia-Barbero A., Negron-Mendoza A., Ramos-Bernal S.
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issue 1
EN
Urea is an organic molecule present in most living organisms. Historically, it was the first organic molecule synthesized in the laboratory. In prebiotic chemistry, urea readily forms in different laboratory simulations using different energy sources. Furthermore, the role of solid surfaces, particularly minerals, might have been crucial to increase the complexity of the organic matter which may have led to the subsequent emergence of life on Earth. In this work, the radiolysis of urea in presence of a clay is studied to determine to what extent the mineral surfaces influence the decomposition of organics. The results indicate that urea is relatively stable to ionizing radiation in aqueous solutions and up to 20 kGy no decomposition is observed. Moreover, the presence of sodium montmorillonite, by a mechanism until now unknown, affects the radiolytic behavior and urea remains in the heterogeneous solution without a change in concentration even at very high doses (140 kGy). These results indicate that solids could have protected some organics, like urea, from degradation enabling them to remain in the environment on the primitive Earth.
2
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Application of recycled natural aluminasilicate doped with vanadium for the decontamination of the air

100%
Marcewicz-Kuba A., Olszewska D.
Polish Journal of Chemical Technology
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2007
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vol. 9
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issue 2
65-67
EN
This paper reports studies on the influence of vanadium concentration on the catalytic activity of DESONOX catalysts (in DESOX reaction) based on modified montmorillonite from Jelsovy Potok. The investigation of the influence on the physicochemical properties of the catalysts on their behaviour has also been studied.
3
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The influence of a hard coal type on the degree of sulphur dioxide removal

75%
Marcewicz-Kuba A., Olszewska D.
Polish Journal of Chemical Technology
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2007
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vol. 9
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issue 3
127-129
EN
In this paper the authors have studied the properties of zeolite and montmorillonite doped with the nickel and cobalt cations in the removal of SO2 from the combustion gases process based on the DESONOX method. Burning coal from the hard coal from the Silesian Coal Basin mine "Julian" and the Lubelskie Coal Basin mine "Bogdanka" with supports only - did not show any reduction of the SO2 emission in the combustion gases.
4
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CHARACTERISATION OF THIN CHITOSAN FILMS FOR GUIDED TISSUE REGENERATION PURPOSES

75%
Lewandowska K., Furtos G. F.
Progress on Chemistry and Application of Chitin and its Derivatives
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2017
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vol. 22
118-124
EN
The morphology and structure of thin films containing chitosan (Ch) with montmorillonite (MMT) were characterised by scanning electron microscopy (SEM), atomic force microscopy (AFM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Thin films of two chitosan samples and a composition of chitosan with montmorillonite were formed by casting methods from acetic acid solutions and were soaked in a simulated body fluid (SBF) solution at 37C for 14 days. The samples were compared before and after soaking. The obtained results showed growth of new phases containing calcium in all prepared films.
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