Extraterrestrial nucleobases in the Murchison meteorite
Zita Martins,Oliver Botta,Oliver Botta,Marilyn L. Fogel,Mark A. Sephton,Daniel P. Glavin,Jonathan S. Watson,Jason P. Dworkin,Alan W. Schwartz,Pascale Ehrenfreund +9 more
TLDR
In this paper, the Murchison meteorite was analyzed and the carbon isotope ratios for uracil and xanthine of δ13C = + 4.5 and + 3.7, respectively, indicated a non-terrestrial origin for these compounds.About:
This article is published in Earth and Planetary Science Letters.The article was published on 2008-06-15 and is currently open access. It has received 312 citations till now. The article focuses on the topics: Murchison meteorite & Chondrite.read more
Citations
More filters
Journal ArticleDOI
Carbonaceous meteorites contain a wide range of extraterrestrial nucleobases
Michael P. Callahan,Karen E. Smith,H. James Cleaves,Josef Ruzicka,Jennifer C. Stern,Daniel P. Glavin,Christopher H. House,Jason P. Dworkin +7 more
TL;DR: The results demonstrate that the purines detected in meteorites are consistent with products of ammonium cyanide chemistry, which provides a plausible mechanism for their synthesis in the asteroid parent bodies, and strongly supports an extraterrestrial origin.
Journal Article
Evolution of a Habitable Planet
TL;DR: In this paper, it is shown that Earth's climate has remained conducive to life for the past 3.5 billion years or more, despite a large increase in solar luminosity, probably because of previous higher concentrations of CO 2 and/or CH4.
Journal ArticleDOI
Understanding prebiotic chemistry through the analysis of extraterrestrial amino acids and nucleobases in meteorites
TL;DR: This tutorial review focuses on meteoritic amino acids and nucleobases, exploring modern analytical methods and possible formation mechanisms, and discusses the unique window that meteorites provide into the chemistry that preceded life on Earth.
Journal ArticleDOI
The Ladder of Life Detection.
Marc Neveu,Marc Neveu,Lindsay Hays,Lindsay Hays,Mary A. Voytek,Michael H. New,Mitchell D. Schulte +6 more
TL;DR: The Ladder of Life Detection (LOD) tool as mentioned in this paper is a tool intended to guide the design of investigations to detect microbial life within the practical constraints of robin's life detection.
Journal ArticleDOI
In search of uracil derivatives as bioactive agents. Uracils and fused uracils: Synthesis, biological activity and applications
Aleksandra Pałasz,Dariusz Cież +1 more
TL;DR: This review article is an effort to summarize recent developments in researches providing uracil derivatives with promising biological potential and to highlight the progress in the chemistry and biological activity of the uracils, predominately after the year 2000.
References
More filters
Journal ArticleDOI
Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid
James D. Watson,Francis Crick +1 more
TL;DR: The determination in 1953 of the structure of deoxyribonucleic acid (DNA), with its two entwined helices and paired organic bases, was a tour de force in X-ray crystallography and opened the way for a deeper understanding of perhaps the most important biological process.
Journal ArticleDOI
A Production of Amino Acids Under Possible Primitive Earth Conditions
TL;DR: In this study, an apparatus was built to circulate CHI4, NH3, H2O, and H2 past an electric discharge, and the resulting mixture has been tested for amino acids by paper chromatography.
Journal ArticleDOI
Molecular structure of nucleic acids: a structure for deoxyribose nucleic acid. J.D. Watson and F.H.C. Crick. Published in Nature, number 4356 April 25, 1953.
Watson Jd,Crick Fh +1 more
TL;DR: A structure for nucleic acid has already been proposed by Pauling and Corey and it is believed that the material which gives the X-ray diagrams is the salt, not the free acid, so without the acidic hydrogen atoms it is not clear what forces would hold the structure together.
Journal ArticleDOI
Earth's early atmosphere
TL;DR: A better understanding of past atmospheric evolution is important to understanding the evolution of life and to predicting whether Earth-like planets might exist elsewhere in the galaxy.
Journal ArticleDOI
Endogenous production, exogenous delivery and impact-shock synthesis of organic molecules: an inventory for the origins of life
TL;DR: Estimates of these sources for plausible end-member oxidation states of the early terrestrial atmosphere suggest that the heavy bombardment before 3.5 Gyr ago either produced or delivered quantities of organics comparable to those produced by other energy sources.