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  • 1
    Electronic Resource
    Electronic Resource
    AZ conformational transition in poly(rArU) and structure marker bands in UV resonance Raman spectroscopy
    Amsterdam : Elsevier
    Journal of Molecular Structure 318 (1994), S. 65-77 
    Details
    ISSN: 0022-2860
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-2860(93)07895-4
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrational analysis and molecular force field of hypoxanthine as determined from ultraviolet resonance Raman spectra of native and deuterated species (1994)
    Springer
    European biophysics journal 23 (1994), S. 115-123 
    Details
    ISSN: 1432-1017
    Keywords: Resonance Raman spectroscopy ; Vibrational analysis ; Hypoxanthine ; Nucleic acids ; Molecular force field
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Ultraviolet resonance Raman scattering spectra from aqueous solutions of hypoxanthine and its deuterated species (C8-deuterated, N-deuterated and C8-, N-deuterated derivatives) have been collected and reported in the spectral region between 400 and 1800 cm−1. The laser excitation wavelengths at 281 nm and 257 nm correspond to preresonance and pure resonance conditions, respectively, with the purine strongly allowed π → π* electronic transition: thus the observed experimental Raman features mainly correspond to inplane vibrational modes. The latter were then assigned according to the Wilson GF method by using an empirical harmonic valence force field. Normal mode calculations are based on a non-redundant set of internal coordinates. The calculated vibrational mode wavenumbers and their isotopic shifts upon selective deuterations are in good agreement with the experimental data. The present normal mode analysis rests on the transferability of the guanine and adenine force constants proposed in recent works based on resonance Raman spectroscopy and neutron inelastic scattering data from these major purine bases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00208865
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  • 3
    Electronic Resource
    Electronic Resource
    On the vibration spectra of vesicle-like droplets: The effects of membrane density fluctuations (1999)
    Springer
    Czechoslovak journal of physics 49 (1999), S. 137-143 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The dynamics of vesicle-like droplets is studied within the Helfrich's concept of interfacial elasticity. The droplet shape fluctuations are accompanied with the membrane density changes. As distinct from the previous theories, the (linearized) hydrodynamic and boundary equations contain inertial terms and are solved exactly. Using the continuity equation for the interface, the secular equation for the vibration frequencies is obtained. Its analysis results in the prediction of a couple of relaxation modes that exist for any finite compressibility of the membrane, and a higher frequency mode determined mainly by the membrane density and compressibility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022857510076
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  • 4
    Electronic Resource
    Electronic Resource
    Genetic refinement of the molecular force field: Normal mode analysis of purine vibrations (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 3 (1997), S. 61-71 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: A new approach to the empirical force field determination by the adaptive optimization method is studied. The problem is conceived as a multiparameter optimization task and solved by the genetic algorithms (GA). The principles of the approach and the most efficient GA strategies are presented. With regard to the computational demands, the GA parameters were looked for in the test series in the force field refinement of the CHCl3 molecule. The most efficient ones were applied to the force field refinement of the bigger molecule of purine. The results show that the GA approach is powerful enough to provide a plausible force field of purine. The perspectives of the approach to bigger systems are outlined. © 1997 John Wiley & Sons, Inc. Biospect 3: 61-71, 1997
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 5
    Electronic Resource
    Electronic Resource
    Surface-enhanced resonance raman spectroscopy of hypericin and emodin on silver colloids: SERRS and NIR FTSERS study (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 1 (1995), S. 265-273 
    Details
    ISSN: 1075-4261
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: SERS, SERRS and NIR FTSERS of emodin and hypericin are reported for the first time on aqueous silver colloid. Intense SERRS spectra can be obtained when using excitation lines at 514 nm for emodin and 598 nm for hypericin. FTIR and NIR FTRaman spectra from these molecules and their model compounds, anthrone and bianthrone, were recorded to assist in the assignment of the SERS bands. From the analysis of the SERS spectra a different orientation for each molecule can be deduced. © 1995 John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bspy.350010405
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  • 6
    Electronic Resource
    Electronic Resource
    From nucleic base to polynucleotide: A vibrational analysis of the repetitive subunits involved in poly(rl) strands (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 25 (1994), S. 507-514 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Ultraviolet resonance Raman spectra of inosine and its deuterated species (C8-d, Nl-d and C8-, Nl-deuterated derivatives) in aqueous solution have been collected (λexc = 257 and 281 nm) and reported in the spectral region between 400 and 1800 cm-1. The observed vibrational modes have been assigned using the Wilson GF method with an empirical harmonic valence force field and a non-redundant set of internal co-ordinates. This normal mode analysis is based on previous work on the vibrational assignments of the hypoxanthine nucleic base and the furanose ring with various geometries. Here the analysis has been carried out by using three different nucleoside conformations as determined from x-ray studies of molecular crystals. The most striking features of the present work are: (i) the assignments of inosine vibrational modes are very different from those of the hypoxanthine base; (ii) the best fit between measured and calculated vibrational wavenumbers and their isotopic shifts upon selective deuteration has been obtained from inosine structures containing an N-type sugar (C3′-endo) associated with a low-anti base. In addition, we have tested the reliability of the force field in the case of inosine residues involved in a canonical A-RNA helical structure by comparing the calculated wavenumbers of the most characteristic vibrational modes with those observed in off- and on-resonance Raman spectra of poly(rI).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250250711
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    Paper (German National Licenses)
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