Organic Chemical Evolution of Reducing Model of the Atmosphere of the Primitive Earth. Role of UV Light and Electric Discharges

1981 ◽  
pp. 83-92 ◽  
Author(s):  
A. Bossard ◽  
F. Raulin ◽  
D. Mourey ◽  
G. Toupance
Keyword(s):  
Chemical Evolution ◽  
Uv Light ◽  
Organic Chemical ◽  
Electric Discharges ◽  
Primitive Earth

Organic synthesis from reducing models of the atmosphere of the primitive earth with UV light and electric discharges

1982 ◽  
Vol 18 (3) ◽  
pp. 173-178 ◽  
Author(s):  
Alain R. Bossard ◽  
François Raulin ◽  
Didier Mourey ◽  
Gérard Toupance
Keyword(s):  
Organic Synthesis ◽  
Uv Light ◽  
Electric Discharges ◽  
Primitive Earth

Prebiotic studies on the interaction of zirconia nanoparticles and ribose nucleotides and their role in chemical evolution

2021 ◽  
Vol 20 (2) ◽  
pp. 142-149
Author(s):  
Avnish Kumar Arora ◽  
Pankaj Kumar
Keyword(s):  
Electron Microscopy ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Chemical Evolution ◽  
Ribonucleic Acid ◽  
Zirconium Oxide ◽  
Origins Of Life ◽  
Neutral Ph ◽  
Interaction Studies

AbstractStudies on the interaction of biomolecules with inorganic compounds, mainly mineral surfaces, are of great concern in identifying their role in chemical evolution and origins of life. Metal oxides are the major constituents of earth and earth-like planets. Hence, studies on the interaction of biomolecules with these minerals are the point of concern for the study of the emergence of life on different planets. Zirconium oxide is one of the metal oxides present in earth's crust as it is a part of several types of rocks found in sandy areas such as beaches and riverbeds, e.g. pebbles of baddeleyite. Different metal oxides have been studied for their role in chemical evolution but no studies have been reported about the role of zirconium oxide in chemical evolution and origins of life. Therefore, studies were carried out on the interaction of ribonucleic acid constituents, 5′-CMP (cytidine monophosphate), 5′-UMP (uridine monophosphate), 5′-GMP (guanosine monophosphate) and 5′-AMP (adenosine monophosphate), with zirconium oxide. Synthesized zirconium oxide particles were characterized by using vibrating sample magnetometer, X-Ray Diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy. Zirconia particles were in the nanometre range, from 14 to 27 nm. The interaction of zirconium oxide with ribonucleic acid constituents was performed in the concentration range of 5 × 10−5–300 × 10−5 M. Interaction studies were carried out in three mediums; acidic (pH 4.0), neutral (pH 7.0) and basic (pH 9.0). At neutral pH, maximum interaction was observed. The interaction of zirconium oxide with 5′-UMP was 49.45% and with 5′-CMP 67.98%, while with others it was in between. Interaction studies were Langmurian in nature. Xm and KL values were calculated. Infrared spectral studies of ribonucleotides, metal oxide and ribonucleotide–metal oxide adducts were carried out to find out the interactive sites. It was observed that the nitrogen base and phosphate moiety of ribonucleotides interact with the positive charge surface of metal oxide. SEM was also carried out to study the adsorption. The results of the present study favour the important role of zirconium oxide in concentrating the organic molecules from their dilute aqueous solutions in primeval seas.

scholarly journals The role of grains in molecular chemical evolution

1986 ◽  
Vol 128 (1) ◽  
pp. 17-31 ◽  
Author(s):  
J. M. Greenberg
Keyword(s):  
Chemical Evolution

The clinical spectrum of mid-dermal elastolysis and the role of UV light in its pathogenesis

1993 ◽  
Vol 28 (6) ◽  
pp. 938-942 ◽  
Author(s):  
Rebecca L. Snider ◽  
Pearon G. Lang ◽  
John C. Maize
Keyword(s):  
Uv Light ◽  
Clinical Spectrum ◽  
Dermal Elastolysis

Grain-Size-Dependent Thermal Transport Properties in Nanocrystalline Yttria-Stabilized Zirconia

2001 ◽  
Vol 703 ◽  
Author(s):  
Ho-Soon Yang ◽  
J.A. Eastman ◽  
L.J. Thompson ◽  
G.-R. Bai
Keyword(s):  
Grain Boundaries ◽  
Thermal Transport ◽  
Chemical Vapor ◽  
Yttria Stabilized Zirconia ◽  
Organic Chemical ◽  
Stabilized Zirconia ◽  
Size Dependent ◽  
Metal Organic ◽  
Organic Chemical Vapor Deposition

ABSTRACTUnderstanding the role of grain boundaries in controlling heat flow is critical to the success of many envisioned applications of nanocrystalline materials. This study focuses on the effect of grain boundaries on thermal transport behavior in nanocrystalline yttria-stabilized zirconia (YSZ) coatings prepared by metal-organic chemical vapor deposition.

The role of phosphorus in chemical evolution

2005 ◽  
Vol 34 (8) ◽  
pp. 691 ◽  
Author(s):  
Enrique Maciá
Keyword(s):  
Chemical Evolution

Role of nitriles and other reactive molecules in chemical evolution

1996 ◽  
Vol 26 (3-5) ◽  
pp. 340-340
Author(s):  
Mohindra S. Chadha
Keyword(s):  
Chemical Evolution
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