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A palaeotemperature curve for the Precambrian oceans based on silicon isotopes in cherts. Shields, G. Precambrian marine carbon isotope database: version 1. Tian, F. A hydrogen rich early Earth atmosphere. Walker, J. Evolution of the Atmosphere. Macmillan, New York. The attention for these two compounds is mainly due to their ability to synthesize nucleic bases and amino acids under experimental conditions relatively mild and coherent with those existing on the primitive Earth.

Noteworthy, formamide is the only chemical precursor able to synthesize at the same time, in addition to some amino acid derivatives, both purine and pyrimidine nucleic bases Ciciriello, Saladino and Di Mauro, ; Costanzo, Saladino and Di Mauro, ; Ciciriello, Saladino and Di Mauro, Here we show, in agreement with the seminal hypotheses of Bernal Bernal, and Cairns-Smith Cairns-Smith , that the prebiotic chemistry of formamide is finely tuned by the presence of different metal oxides and minerals in the reaction mixture, thus modelling the microenvironment of the primitive Earth.

These compounds can act as catalysts for condensation processes, enhancing the concentration of the reactant and preserving newly formed biomolecules from chemical and photochemical degradation. Moreover, the elemental composition of the minerals used as catalysts plays a major role in the selectivity of the syntheses of nucleic bases catalyzing the in situ decomposition of formamide to other chemicals potentially useful for the construction of both purine and pyrimidine scaffolds.

Taken together, these procedures suggest novel scenarios for the molecular evolution of life on the primitive Earth and may provide a chemical clue to the evaluation of the plausible emergence of extraterrestrial forms of life. Tran Tharh Van, J. Mounolou, J. Schneider, C.

McKay, Eds. Ciciriello, G. Costanzo, S. Pino, C. Crestini, R. Saladino, E.

Di Mauro Biochemistry 47 9 , — Costanzo, R. Saladino, C. Crestini, F. Ciciriello, E. Di Mauro J. Crestini, G. Costanzo, E. Walde, Springer-Verlag Berlin Heidelberg. Negri, E. Ehrenfreund ed.

Di Mauro Orig. Life Evol.

Costanzo, C. Di Mauro, Astrobiology, 7, — Trifonov University of Haifa, Israel, and Masaryk University, Brno, Czech Republic Reconstruction of evolutionary history of the genetic code Trifonov, on the basis of consensus temporal order of engagement of amino acids in early evolution, provides a powerful tool for further reconstruction of early molecular events. In particular, the binary code of protein sequences has been suggested by the evolutionary chart of the codons, and confirmed Gabdank et al.

The binary sequences of Alanine type and Glycine type residues represent possible ancestral forms of modern letter alphabet sequences. Oligopeptides that are found in proteomes of every prokaryote omnipresent elements , that are likely to represent the sequences from last common ancestor, in their binary form all fit to a unique Aleph-Beth Prototype sequence, that corresponds to ATP-binding and ATPase modules of modern ABC transporters.

The Prototype has mosaic structure, being built of single point change derivatives of primordial Gly 7 and Ala 7 peptides. Gabdank, I. The establishment of the systems of automultiplication and the homochirality of compounds had been the prerequisite for the chemical origins of life.

Several theories have been proposed for the possible origins of chirality such as circularly polarized light CPL , chiral inorganic crystals, spontaneous absolute asymmetric synthesis, and chiral crystals of achiral organic compounds, However, enantioenrichments induced by these proposed origins of chirality have been very low, and the relationship has not been clear between the low enantioenrichments induced by the proposed mechanisms and the high enantioenrichment of biomolecules.

We report asymmetric autocatalysis with amplification of chirality.

Pyrimidyl alkanol works as an asymmetric autocatalyst in the addition of diisopropylzinc to pyrimidinecarbaldehyde. The initial very low ca. Soai and Kawasaki, The tiny enantioenrichments induced by right or left handed CPL, chiral inorganic crystals such as d and l-quartz, sodium chlorate, cinnabar, and chiral crystals of achiral organic compounds are correlated successfully to the high enantioenrichments by asymmetric autocatalysis.

CPL and chiral crystals serve as chiral initiators of asymmetric autocatalysis and gave the highly enantioenriched pyrimidyl alkanol with the absolute configuration correlated to those of the chiral initiators.

Spontaneous absolute asymmetric synthesis is possible with the asymmetric autocatalysis.

Even without adding chiral initiator, i. Asymmetric autocatalysis is a powerful method for chiral discrimination and the elucidation of the mechanism of the reaction Kawasaki et al.

Sato et al. Lutz et al. Open image in new window Lutz, F. Kawasaki, T. Acta, — Sato, I. Soai, Soai, K. In: G.

Asymmetric Autocatalysis with Amplification of Chirality. In: Soai, K. One such enzyme, the R3C ligase Rogers and Joyce, , was configured so that it could produce additional copies of itself by joining two component oligonucleotides Paul and Joyce, Mueller, E.

Wiffen, F. Fluorescence Foodstuffs Forensic mic. Fractography Braeutigam, F. Haitinger, M. Ploem, J. Vaughan, J. Johafi, O.

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Least as good authority towards the site you probably header tags.Our results show that each oxygen reductase type has a very different evolutionary history. Valdre, U. Os grupos maiores consi Page and Titan is today still the only confirmed exobiotic environment known to us.

Na Figura 6.

Analytical mic. Evolution of the Atmosphere. Terrestrial planets form by the slow process of collisions and sticking between increasingly larger dust grains, pebbles, boulders, and mountains of rock and ice termed planetesimals. Ou pode ser tratado com mais vapor Page and Figura 6.