. Aspects of the origin of life. Life; Biochemistry; Biochemistry; Biogenesis. 200 pH 3-42 citrate buffer, ml Column : Dowex 50 x8 100x0-9 cm Fig. 4. 37-5 °C Hydrolysate of reaction product of HCN with 1-5M phosphate buffer Fig. 5. Hydrolysate of reaction product of HCN with poly-dehydroalanine. Paper chromatogram of DNP-derivatives. The formation of aromatic and heterocyclic amino acids in the fore-protein could have occurred by the condensation of methylene group of glycyl residue followed by hydrogenation (Fig. 6). The chemical structure of phenylalanine, tyrosine, try
. Aspects of the origin of life. Life; Biochemistry; Biochemistry; Biogenesis. 200 pH 3-42 citrate buffer, ml Column : Dowex 50 x8 100x0-9 cm Fig. 4. 37-5 °C Hydrolysate of reaction product of HCN with 1-5M phosphate buffer Fig. 5. Hydrolysate of reaction product of HCN with poly-dehydroalanine. Paper chromatogram of DNP-derivatives. The formation of aromatic and heterocyclic amino acids in the fore-protein could have occurred by the condensation of methylene group of glycyl residue followed by hydrogenation (Fig. 6). The chemical structure of phenylalanine, tyrosine, tryptophan and histidine, in which one methylene group is situated between an aromatic or heterocyclic nucleus and a glycine group might support the above-mentioned mechanism of their formation in the fore-protein. The formation of vahne, leucine and isoleucine might have resulted from the direct addition of propylene, zVobutene and but-2-ene respectively as shown in Fig. 6. Experimental evidence for such a mechanism is not yet sufficient. Every attempt to introduce a group to polyglycine chain with basic catalysts has failed. When, however, polyglycine dispersed on Japanese acid clay was. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Florkin, Marcel; International Symposium on the Origin of Life on Earth (1957 : Moscow). Proceedings. Oxford, New York, Pergamon Press
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