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  • 1
    Electronic Resource
    Electronic Resource
    A note on population densities of mollusca in the river Great Ouse at Ely, Cambridgeshire (1976)
    Springer
    Hydrobiologia 48 (1976), S. 195-197 
    Details
    ISSN: 1573-5117
    Keywords: Mollusca ; Population dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Population density and dispersion of ten species of freshwater molluscs have been estimated by random quadrat sampling. An apparent association between four of the species is described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00028690
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Prebiotic phosphorylation of thymidine at 65 C in simulated desert conditions. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The phosphorylation of thymidine is described for a variety of conditions at 65 C to demonstrate that the reaction could readily take place in deserts at the present time. This might be used as an indication that urea-phosphate mixtures could have been important as phosphorylating agents on the primitive earth. Reaction products were identified by comparing their chromatographic and electrophoretic mobilities with those of authentic materials and by enzymatic degradation. The results show that good yields of nucleotides are obtained when nucleosides are heated with urea-phospate mixtures at 65 C. Reactions proceed more rapidly at moderate humidities than in a stream of dry nitrogen. Occasional wetting results in even faster and more extensive reactions. There was no reaction for a mixture of urea and trimetaphosphate.
    Keywords: BIOSCIENCES
    Type: Nature; 237; May 19
    Format: text
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    NASA TECHNICAL REPORTS
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