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  • 1970-1974  (3)
  • 1870-1879
  • Analytical Chemistry and Spectroscopy  (2)
  • Entropy  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular evolution 1 (1971), S. 97-111 
    ISSN: 1432-1432
    Keywords: Molecular Evolution ; Taxonomy ; Molecular Information Measures ; Ensemble Information Source ; Entropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The concepts of a super information source and ensemble averaging are used to estimate the amount of information stored in protein andt-RNA sequences. Specifically applied to cytochrome c and hemoglobins, information measures analogous to those found to be highly significant for DNA pair frequency data (D 2 vs.R) by Gatlin (1968) prove to be extremely highly correlated with organism complexity. Super source stability and the possible taxonomic utility of the extraordinary clusterings obtained are discussed. A restriction on the construction of ancestral sequences and a possible handle on homology are also detailed.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rearrangement of the molecular ions of tetracyclone, tetraphenylquinone, tetraphenylthiophene dioxide and pentaphenylcyclopentadienol prior to decomposition, rather than formation of a symmetrical [C4Ar4]+· ion, is considered as an alternative method for the production of [C2Ar2]+·. The p-fluoro substituent is used to elicit information about the positional origins of the [C2Ar2]+· fragments. Operation of a double focusing mass spectrometer in the defocused mode reveals that the integrity of the molecular ion in different systems is affected to varying degrees, ranging from total lack of rearrangement to virtually complete scrambling.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 841-861 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several alkylhydroxynaphthoquinones and chemically related cyclic compounds were subjected to mass spectrometric investigation. Fragmentation pathways were elucidated by use of metastable ions, relative intensities of normal ions and accurate mass measurement. In these series, differences in the spectra of 1,2- and 1,4-naphthoquinones are slight. Evidence for ring expansion in ions from furans is suggested.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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