Results 141 to 150 of about 10,842 (176)
Some of the next articles are maybe not open access.
Meteorites as Catalysts for Prebiotic Chemistry
Chemistry – A European Journal, 2013OH (2:1 v/v), and sulfu-ric acid. In the case of chondrites, achondrites, and stony-iron meteorites, the samples were also pyrolyzed at 6008C.After the treatment, the powders did not release any traceof organic substances. The synthesis of large number of com-pounds was observed (Scheme 1): nucleobases and their an-alogues, carboxylic acids, amino ...
Raffaele Saladino +3 more
openaire +3 more sources
Prebiotic-like chemistry on Titan
Chemical Society Reviews, 2012Titan, the largest satellite of Saturn, is the only one in the solar system with a dense atmosphere. Mainly composed of dinitrogen with several % of methane, this atmosphere experiences complex organic processes, both in the gas and aerosol phases, which are of prebiotic interest and within an environment of astrobiological interest.
François, Raulin +3 more
openaire +2 more sources
Prebiotic Chemistry and the Origin of the RNA World [PDF]
Critical Reviews in Biochemistry and Molecular Biology, 2004 The demonstration that ribosomal peptide synthesis is a ribozyme-catalyzed reaction makes it almost certain that there was once an RNA World. The central problem for origin-of-life studies, therefore, is to understand how a protein-free RNA World became established on the primitive Earth. We first review the literature on the prebiotic synthesis of the
Orgel Leslie E, Leslie E Orgel
exaly +3 more sources
The cometary contribution to prebiotic chemistry
Advances in Space Research, 1992Different estimates based on dynamical considerations, lunar cratering rates, Solar System chemical abundances, and the single-impact theory on the origin of the Earth-Moon system suggest that comets and other related small, volatile-rich primitive minor bodies captured by the Earth during the early Archean must have been a major source of volatiles on
J, Oró, T, Mills, A, Lazcano
openaire +2 more sources
On the Role of Water as a Catalyst in Prebiotic Chemistry
ChemPhysChem, 2020AbstractIn this manuscript we provide computational support to the catalytic role of water in all kinds of pseudopericyclic reactions operating in the reductive acid cycle, as well as in other metabolic processes. Water catalysis is not limited to those reactions where simple translocation of hydrogen atoms occurs, such as those represented by NuH+E→Nu‐
José M. Saa, Antonio Frontera
openaire +2 more sources
Rooting Prebiotic Chirality in Spinomeric Chemistry?
Astrobiology, 2009Spinomeric chemistry is a domain of physical chemistry that explores the role of spin-isomery in chemical reactivity. In large magnetic fields (B), chemical structures with three adjacent nuclear spins (such as H(2)(17)O, H(2)(33)S,-NH(2), and and -(13)CH(2)-) form complex spinomers.
Radu, Popa +2 more
openaire +2 more sources
Mechanistic possibilities in prebiotic thiophosphate chemistry
Journal of Molecular Evolution, 1978Two types of reactivities of thiophosphates have been demonstrated: one being nucleophilic displacement by the P-S moiety of nucleoside phosphorothioates and the other, phosphorylation via P-S cleavage as the driving force. We have designed a system where both displacement on carbon and P-S cleavage are possible.
I, Kapovits, J, Nagyvary
openaire +2 more sources
Recent progress in the prebiotic chemistry of HCN
Origins of Life, 1984This article reports some recent results on the mechanisms of synthesis of biologically important molecules in oligomerizing solutions of HCN. It will also attempt to summarize, as completely as possible, our present state of knowledge concerning the range of products obtained under a variety of conditions in this reaction system.
A W, Schwartz +2 more
openaire +2 more sources
The importance of prebiotic chemistry in the RNA World
Current Opinion in Chemical Biology, 2004In vitro selection experiments have clearly demonstrated that RNA can perform many of the functions necessary to support an RNA world. Moreover, it appears that novel functions could have readily evolved from existing functional RNA molecules. Therefore, diverse molecular ecosystems could potentially have arisen from an initial, small population of ...
Randall A, Hughes +3 more
openaire +2 more sources
Prebiotic chemistry: A bioorganic perspective
Tetrahedron, 19971. Scope 2. The Primordial Earth 3. Prebiotic Feedstock Molecules 4. Synthesis of Amino Acids 5. Synthesis of Purines and Chemistry of HCN 6. Synthesis of Pyrimidines 7. Synthesis of Sugars 8. Synthesis of Sugar Phosphates 9. Synthesis of Riboflavin 10. Theories 11. The R N A W o r l d 12. In vitro Evolution 13.
John D Sutherland, J Nicole Whitfield
openaire +1 more source