Origins of life
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The Logic of Life
Origins of life - Tập 46 Số 4 - Trang 507-513 - 2016
In this paper we propose a logical connection between the physical and biological worlds, one resting on a broader understanding of the stability concept. We propose that stability manifests two facets - time and energy, and that stability’s time facet, expressed as persistence, is more general than its energy facet. That insight leads to the logical formulation of the Persistence Principle, which...... hiện toàn bộ
Search for amino acids in apollo returned lunar soil
Origins of life - Tập 6 - Trang 541-550 - 1975
The lunar samples from Apollo flights 11 through 17 provided the students of chemical evolution with an opportunity of examining extraterrestrial materials for evidence of early prebiological chemistry in the solar system. Our search was directed to water-extractable compounds with emphasis on amino acids. Gas chromatography, ion-exchange chromatography and gas chromatography combined with mass sp...... hiện toàn bộ
Symmetry Breaking by Consecutive Amplification: Efficient Paths to Homochirality
Origins of life - Tập 52 - Trang 75-91 - 2022
To understand chiral symmetry breaking on the molecular level, we developed a method to efficiently investigate reaction kinetics of single molecules. The model systems include autocatalysis as well as a reaction cascade to gain further insight into the prebiotic origin of homochirality. The simulated reactions start with a substrate and only a single catalyst molecule, and the occurrence of symme...... hiện toàn bộ
High Z metallochiral compounds and the origin of biological chirality: Experimental results using polarized positrons
Origins of life - Tập 16 - Trang 423-423 - 1986
Chemical Analysis of a “Miller-Type” Complex Prebiotic Broth
Origins of life - Tập 46 - Trang 149-169 - 2015
In a famous experiment Stanley Miller showed that a large number of organic substances can emerge from sparking a mixture of methane, ammonia and hydrogen in the presence of water (Miller, Science 117:528–529, 1953). Among these substances Miller identified different amino acids, and he concluded that prebiotic events may well have produced many of Life’s molecular building blocks. There have been...... hiện toàn bộ
Products of the Strecker synthesis as indicators of parent body conditons of the Murchison meteorite
Origins of life - Tập 26 - Trang 210-211 - 1996
A hypothesis: Reciprocal information transfer between oligoribonucleotides and oligopeptides in prebiotic molecular evolution
Origins of life - Tập 24 - Trang 495-505 - 1994
We wish to propose a mechanism for reciprocal information transfer in prebiotic molec-ular evolution, based on heterologous pairing complex formation between oligoribonucleotides and oligopeptides. In this proposed pairing complex, the bases of the oligoribonucleotide and the side chains of the oligopeptide may form three types of complementary Watson-Crick-type hydrogen bonds. The structural basi...... hiện toàn bộ
Inhibition of Rare Earth Catalytic Activity by Proteins
Origins of life - Tập 30 - Trang 25-32 - 2000
Catalytic action of rare earth element, Ce(IV) to hydrolyzephosphomonoester bonds was confirmed. This effect wasconsidered to suppress abiotic synthesis ofnucleotides and nucleic acids in the primitive sea,and hence the origin of life. However, we found thatthe presence of proteins, especially albumin, stronglyinhibited the catalytic action of Ce(IV). Thisfinding was supported by preferential bind...... hiện toàn bộ
Chemical Reduction of Phosphate on the Primitive Earth
Origins of life - Tập 29 - Trang 555-561 - 1999
If phosphorus played a role in the origin of life, some means of concentrating micromolar levels of phosphate (derived from the calcium phosphate mineral apatite), must first have been available. Here we show that simulated (mini)lightning discharges in model prebiotic atmospheres, including only minimally reducing ones, reduce orthophosphates, including apatite, to produce substantial yields of p...... hiện toàn bộ
Study of Plasma Induced Chemistry by DC Discharges in CO2/N2/H2O Mixtures Above a Water Surface
Origins of life - Tập 38 - Trang 23-35 - 2007
The chemistry induced by atmospheric pressure DC discharges above a water surface in CO2/N2/H2O mixtures was investigated. The gaseous mixtures studied represent a model prebiotic atmosphere of the Earth. The most remarkable changes in the chemical composition of the treated gas were the decomposition of CO2 and the production of CO. The concentration of CO increased logarithmically with the incre...... hiện toàn bộ
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