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  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular evolution 10 (1977), S. 193-209 
    ISSN: 1432-1432
    Schlagwort(e): Prebiotic ; Polymerization ; Deoxythymidine oligonucleotides ; Deoxythymidine 5′-triphosphate ; Deoxythymidine 5′-monophosphate ; 4-amino-5-imidazolecarboxamide ; Cyanamide
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary When an aqueous solution (pH 7.0) of3H deoxythymidine 5′-triphosphate, deoxythymidine 5′-phosphate, 4-amino-5-imidazolecarboxamide, cyanamide and ammonium chloride was dried and heated at 60°C for 18 h, oligomers were obtained in a yield of approximately 80%. After the chemical degradation of any pyrophosphate bonds present in these oligomers, linear polynucleotides of up to 7–8 units in length were isolated by DEAE cellulose column chromatography and identified by enzymatic digestion procedures. The di- and trinucleotide fractions were degraded 87% and 100% by snake venom phosphodiesterase and 39% and 9% by spleen phosphodiesterase. This synthesis of deoxythymidine oligonucleotides was conducted under potentially prebiotic conditions and may offer a possible method for the synthesis of deoxyoligonucleotides on the primitive Earth.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular evolution 10 (1977), S. 183-192 
    ISSN: 1432-1432
    Schlagwort(e): Prebiotic ; Polymerization ; Deoxythymidine oligonucleotides ; Deoxythymidine 5′-monophosphate ; P1, P2-dideoxythymidine 5′-pyrophosphate ; 4-amino-5-imidazolecarboxamide ; Cyanamide
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary When an aqueous solution (pH 7.0) of deoxythymidine 5′-phosphate, 4-amino-5-imidazolecarboxamide and cyanamide was dried and heated for 18 h at 60°C, P1, P2-dideoxythymidine 5′-pyrophosphate (I) was formed in a 58% yield. Oligonucleotides were not detected in the reaction product. Under conditions employed in the above reaction, (I) was shown to be stable. In prebiotic polymerization reactions employing deoxythymidine 5′-triphosphate as the polymerizing species, (I) could therefore function as a primer and minimize the formation of cyclic nucleotides.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular evolution 10 (1977), S. 221-230 
    ISSN: 1432-1432
    Schlagwort(e): Prebiotic ; Acylglycerols ; Tripalmitolglycerol ; Cyanamide ; Imidazole
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The synthesis of palmitoylglycerols in good yields occurs when a solution of glycerol, ammonium palmitate, cyanamide and imidazole is dried and heated at ambient humidity at temperatures ranging from 60°–100°C for 16 h. Much less product is formed in the absence of either or both cyanamide or imidazole. This work suggests that acylglycerols could have been synthesized on the primitive Earth under plausible prebiotic conditions which were similar but not identical to those which have been shown to condense deoxynucleotides into oligodeoxynucleotides and amino acids into peptides.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of molecular evolution 3 (1974), S. 323-330 
    ISSN: 1432-1432
    Schlagwort(e): Prebiotic ; Polymerization ; Deoxythymidine-Oligonucleotides ; Deoxythymidine-Triphosphate ; Cyanamide ; 4-Amino-5-Imidazolecarboxamide
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Deoxythymidine 5′-triphosphate in the presence of deoxythmidine 5′-phosphate, cyanamide and 4-amino-5-imidazole carboxamide polymerizes under drying conditions at moderate temperatures (60–90 °C) to yield oligonucleotides of up to four units in length. Enzymatic analysis indicated the majority of these oligomers contained natural 3′–5′ phosphodiester bonds. This reaction offers a possible method for the formation of deoxyoligonucleotides under primitive earth conditions.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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