ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Prebiotic  (15)
  • LUNAR AND PLANETARY EXPLORATION  (2)
  • 1
    facet.materialart.
    Unknown
    The search for organic substances and inorganic volatile compounds in the surface of Mars (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A total of four Martian samples, one surface and one subsurface sample at each of the two Viking landing sites, Chryse Planitia and Utopia Planitia, have been analyzed for organic compounds by a gas chromatograph-mass spectrometer. In none of these experiments could organic material of Martian origin be detected at detection limits generally of the order of parts per billion and for a few substances closer to parts per million. The evolution of water and carbon dioxide, but not of other inorganic gases, was observed upon heating the sample to temperatures of up to 500 C. The absence of organic compounds seems to preclude their production on the planet at rates that exceed the rate of their destruction. It also makes it unlikely that living systems that behave in a manner similar to terrestrial biota exist, at least at the two Viking landing sites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research; 82; Sept. 30
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 2
    facet.materialart.
    Unknown
    Search for organic and volatile inorganic compounds in two surface samples from the Chryse Planitia region of Mars (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Two surface samples collected from the Chryse Planitia region of Mars were heated to temperatures up to 500 C, and the volatiles that they evolved were analyzed with a gas chromatograph-mass spectrometer. Only water and carbon dioxide were detected. This implies that organic compounds have not accumulated to the extent that individual components could be detected at levels of a few parts per billion by weight in the samples. Proposed mechanisms for the accumulation and destruction of organic compounds are discussed in the light of this limit.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 194; Oct. 1
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Template-directed synthesis and selective adsorption of oligoadenylates on hydroxyapatite (1980)
    Springer
    Journal of molecular evolution 15 (1980), S. 347-354 
    Details
    ISSN: 1432-1432
    Keywords: Adenosine 5′-phosphorimidazolide ; Template-directed condensation ; Oligoadenylates ; Adsorption ; Hydroxyapatite ; Prebiotic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Polyuridylic acid is adsorbed completely from aqueous solution by hydroxyapatite under conditions that permit template-directed synthesis of oligoadenylates in free solution. The yield of oligoadenylates is enhanced to almost the same extent by poly(U) in the presence or the absence of hydroxyapatite. Under very similar conditions small quantities of hydroxyapatite adsorb higher molecular-weight oligoadenylates selectively from a mixture of oligomers. On the basis of these results we propose a mechanism for prebiotic oligonucleotide formation in which selective adsorption on hydroxyapatite or some other immobilized anion-exchanging material plays a major role. Monomers are released from the surface for reactivation, while oligomers are retained in a protected environment by adsorption to the apatite surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01733141
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Analysis of high molecular weight material from the polymerization of adenosine cyclic 2′, 3′-phosphate (1974)
    Springer
    Journal of molecular evolution 3 (1974), S. 115-120 
    Details
    ISSN: 1432-1432
    Keywords: Adenosine Cyclic 2′, 3′-Phosphate ; Polymerization ; 1, 2-Diaminoethane ; Oligonucleotides ; Prebiotic ; Gel Permeation ; Ion Exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Adenosine cyclic 2′, 3′-phosphate has been polymerized at room temperature in the dry state using 1, 2-diaminoethane at alkaline pH as catalyst. The high molecular weight products have been analyzed by several different methods, including ion exchange and gel permeation chromatography and phosphate end-group analysis. Gel permeation chromatography showed that between 3.6% and 8.1% of material higher than the hexamer was formed in 3-, 15- and 40-day reactions. The material from a large-scale, 3-day reaction mixture was first fractionated by ion exchange chromatography and the highest molecular weight material then further fractionated by gel permeation chromatography. End-group analysis on the fractions obtained by this procedure showed that 0.67% of the total reaction mixture was polymer with an average chainlength of 13.4; a trace (0.15%) of higher polymer was also formed, but there was insufficient to determine its average chainlength. The prebiological relevance of these findings is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01796557
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 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
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...