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  • Electronic Resource  (12)
  • Polymer and Materials Science  (10)
  • Key words: Laparoscopy — Vascular — Abdominal aortic aneurysm  (2)
  • 11
    Electronic Resource
    Electronic Resource
    Raman spectral studies of nucleic acids. XI. Conformations of yeast tRNAPhe and E. coli ribosomal RNA in aqueous solution and in the solid statePaper X in this series is G. J. Thomas, Jr., M. C. Chen, and K. A. Hartman, Biochim. Biophys. Acta, 324, 37 (1973) (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 615-626 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Laser-excited Raman spectra of tRNAPhe from yeast and of fractionated 16S and 23S rRNA from E. coli are reported for samples in aqueous solution and in the solid state. The Raman scattering spectrum of each RNA is not significantly altered by the change from an aqueous to a solid environment and displays the same characteristic frequencies and intensities associated with ordered polyribonucleotide structures. Unlike DNA, the backbone conformation of RNA thus appears to be largely insensitive to gross changes in the degree of hydration.Raman scattering from the phosphate group vibrations of aqueous tRNAyeastPhe is qualitatively and quantitatively the same as obtained from previously studied tRNA's and is indicative of a highly ordered conformational structure in which some 85% of the nucleotide residues are in ordered configurations. The major differences observed between spectra of tRNA and rRNA are attributed to differences in base composition of these RNA's.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130313
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Polarized Raman studies of crystalline and amorphous orientation in polyethylene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 37-48 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polarized Raman intensities have been obtained from thin films of oriented low-density polyethylene (PE) immersed in silicone oil to minimize surface scattering. Studies were made using the 1170 cm-1 crystalline band and the 1081 cm-1 amorphous band, and from these the orientation averages 〈cos2 θ〉 and 〈cos4 θ〉 were calculated. These were found to compare favorably with the values of 〈cos2 θ〉 for the polymer chain in the crystalline and amorphous phases obtained from measurements of infrared dichroism. Both orientation averages could be theoretically fitted by using reasonable parameters.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160104
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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