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  • Prebiotic  (15)
  • Springer  (15)
  • 2020-2024
  • 2010-2014
  • 1975-1979  (9)
  • 1970-1974  (6)
  • 1945-1949
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Keywords
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  • Springer  (15)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Further studies of urea-catalyzed phosphorylation reactions (1973)
    Springer
    Journal of molecular evolution 2 (1973), S. 231-234 
    Details
    ISSN: 1432-1432
    Keywords: Phosphorylation ; Nucleotides ; Nucleoside Polyphosphates ; Oligonucleotides ; Urea ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have analyzed the products formed when mixtures of a nucleoside and ammonium dihydrogen phosphate are heated with an excess of urea. If there is more phosphate than nucleoside in the mixture, compounds containing pyrophosphate bonds are obtained. If uridine, as nucleoside, is in excess over phosphate, di- and oligonucleotides are formed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01654004
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of nucleoside 5′-polyphosphates under potentially prebiological conditions (1976)
    Springer
    Journal of molecular evolution 8 (1976), S. 197-210 
    Details
    ISSN: 1432-1432
    Keywords: Polyphosphate Degradation ; Trimetaphosphate ; Nucleoside 5′-Poly-phosphates ; Urea ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Aqueous solutions of linear inorganic polyphosphates incubated in presence of Mg ions depolymerize to give trimetaphosphate. The presence of a nucleoside 5′-phosphate has little influence upon the reaction. Drying the products obtained by incubating a linear polyphosphate with Mg ions in the presence of a nucleoside 5′-phosphate yields nucleoside 5′-polyphos-phates. The prebiological relevance of the reactions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730997
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  • 3
    Electronic Resource
    Electronic Resource
    Triple helices formed by polyuridylic acid with some adenosine derivatives (1975)
    Springer
    Journal of molecular evolution 5 (1975), S. 117-123 
    Details
    ISSN: 1432-1432
    Keywords: Polyuridylic Acid ; Triple-Helix Formation ; Melting Temperatures ; Nucleoside Phosphoramidates ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have prepared a variety of derivatives of adenosine which, at neutral pH's, carry protonated amine functions. These derivatives form stable helical structures with polyuridylic acid, but the melting points are not substantially higher than those of helical complexes formed by adenosine derivatives lacking cationic groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01732516
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of nucleoside 5′-polyphosphates from nucleotides and trimetaphosphate (1975)
    Springer
    Journal of molecular evolution 6 (1975), S. 237-252 
    Details
    ISSN: 1432-1432
    Keywords: Trimetaphosphate ; Nucleoside 5′-Polyphosphates ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When solutions of nucleoside 5′-phosphates and trimetaphosphate are dried out at room temperature, nucleoside 5′-polyphosphates are formed. The Mg++ ion shows a superior catalytic function in this reaction when compared with other divalent metal ions. Starting with nucleoside 5′-phosphates, Mg++ and trimetaphosphate, the predominant products in the nucleoside 5′-polyphosphate series pnN are p4N, p7N and P10N. Nucleoside 5′-diphosphates yield p5N and p8N, nucleoside 5′-triphosphates give p6N and p9N. The prebiological relevance of these reactions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01794633
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  • 5
    Electronic Resource
    Electronic Resource
    Polymerization of nucleotide analogues I: Reaction of nucleoside 5′-phosphorimidazolides with 2′-amino-2′-deoxyuridine (1976)
    Springer
    Journal of molecular evolution 7 (1976), S. 253-267 
    Details
    ISSN: 1432-1432
    Keywords: 2′-Amino-2′-Deoxyuridine ; 2′-Amino-2′-Deoxyuridine 5′-Phosphor-imidazolide ; Polycondensation ; Nucleotide Analogues ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 2′-Amino-2′-deoxyuridine reacts efficiently with nucleoside 5′-phosphorimidazolides in aqueous solution. The dinucleoside monophosphate analogues were obtained in yields exceeding 80% under conditions in which little reaction occurs with the natural nucleosides. In a similar way, the 5′-phosphorimidazolide of 2′-amino-2′-deoxyuridine undergoes self-condensation in aqueous solution to give a complex mixture of oligomers. The phosphoramidate bond in the dinucleoside monophosphate analogues is stable for several days at room temperature and pH 7. The mechanisms of their hydrolysis under acidic and alkaline conditions are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01743625
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  • 6
    Electronic Resource
    Electronic Resource
    Studies in prebiotic synthesis. VII (1972)
    Springer
    Journal of molecular evolution 1 (1972), S. 249-257 
    Details
    ISSN: 1432-1432
    Keywords: Prebiotic ; Nucleosides ; Dry-phase ; Seawater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The purine nucleosides (adenosine, guanosine, inosine, xanthosine) are formed when the corresponding purine bases and D-ribose are heated together in the presence of certain salts and minerals. The salts remaining after the evaporation of seawater are particularly effective in these syntheses. The relevance of these reactions for prebiological evolution is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01660244
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  • 7
    Electronic Resource
    Electronic Resource
    Formation of nucleoside 5′-phosphoramidates under potentially prebiological conditions (1977)
    Springer
    Journal of molecular evolution 10 (1977), S. 137-154 
    Details
    ISSN: 1432-1432
    Keywords: Aminolysis ; Adenosine 5′-polyphosphates ; Adenosine 5′-phosphoramidates ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Adenosine 5′-phosphoramidates form when solutions containing adenosine 5′-polyphosphates pnA (n ≧ 3) or P1, P2-diadenosine 5′-diphosphate and amines are allowed to dry out. Mg ions catalyze these reactions. We have studied systems containing ammonia, imidazole, glycine, ethylenediamine and histamine. The yields of adenosine 5′-phosphoramidates range from 10–50 % based on the nucleotide. The prebiotic significance of the reactions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01751807
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  • 8
    Electronic Resource
    Electronic Resource
    Formation of P1, P2-dinucleoside 5′-pyrophosphates under potentially prebiological conditions (1978)
    Springer
    Journal of molecular evolution 11 (1978), S. 17-23 
    Details
    ISSN: 1432-1432
    Keywords: P1, P2-Dinucleoside 5′-Pyrophosphates ; Nicotinamide adenine dinucleotide ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Organic pyrophosphates such as UppA and NAD are formed when a solution containing a nucleotide, a nucleoside 5′-polyphosphate, Mg2+ and imidazole are allowed to dry out. We suggest that this synthesis may have occured concurrently with oligonucleotide formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01768021
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  • 9
    Electronic Resource
    Electronic Resource
    On the possible role of crystals in the origins of life (1974)
    Springer
    Journal of molecular evolution 3 (1974), S. 141-150 
    Details
    ISSN: 1432-1432
    Keywords: Adsorption ; Clay ; Montmorillonite ; Phosphoramidates ; Polymerization ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Nucleoside phosphoramidates derived from polyamines containing at least three amine groups are strongly adsorbed by sodium and magnesium montmorillonite clays even from very dilute solutions. Heating the dried clay-phosphoramidate mixture results in the production of small amounts of the dinucleotides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01796559
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  • 10
    Electronic Resource
    Electronic Resource
    Catalysts for the self-polymerization of adenosine cyclic 2′,3′-phosphate (1973)
    Springer
    Journal of molecular evolution 2 (1973), S. 303-316 
    Details
    ISSN: 1432-1432
    Keywords: Polymerization ; Phosphorylation ; Adenosine Cyclic 2′,3′-phosphate ; Oligonucleotides ; Amines ; 2-Aminoethanol ; Amino Acids ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When adenosine cyclic 2′,3′-phosphate is evaporated from solution in the presence of simple catalysts such as aliphatic diamines at alkaline pH, and maintained in a dry state at moderate temperatures (25-85°C), self-polymerization to give oligonucleotides of chainlength up to at least 6 is observed. The products contain an excess of [3′→5′]-linkages over [2′→5′]-linkages. The effects of different catalysts and reaction conditions on the efficiency of the reaction are described. The prebiological relevance of these reactions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01654098
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