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  • 1
    Electronic Resource
    Electronic Resource
    FT-Raman investigation of alkaloids in the liana Ancistrocladus heyneanus (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Biospectroscopy 4 (1998), S. 113-120 
    Details
    ISSN: 1075-4261
    Keywords: FT-Raman spectroscopy ; micro-Raman technique ; Ancistrocladus heyneanus ; naphthylisoquinoline alkaloids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Physics
    Notes: The applicability of the micro-FT-Raman technique for studying alkaloids in vitro and for observing alkaloids in plant cells is demonstrated. This technique is examined using fresh plant material of Ancistrocladus heyneanus, a tropical liana known to produce pharmacologically interesting naphthylisoquinoline alkaloids as secondary metabolites. It will be shown that it is possible to localize and identify some of these alkaloids in different parts of the plant by means of Raman microspectroscopic studies. Data on the in situ structure and the spatial distribution can be obtained, which could provide information about the biosynthesis of the alkaloids in the plant. © 1998 John Wiley & Sons, Inc. Biospectroscopy 4: 113-120, 1998
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Calibration of the absolute spectral response of Raman spectrometers (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 585-592 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A system for the calibration of the absolute spectral response of spectrometers is described using a standard reflector - of the type used especially for colour measurements - as a secondary light source. In contrast to conventional light sources for calibrations, the radiance is approximately constant over the whole area of the source, and the angular characteristic is known for a large range of reflection angles ϕ. A special advantage is that the angular characteristic follows closely the Lambert-cosine-jaw in the region ϕ∼45°. The radiant flux can be calculated exactly for various experiemental conditions, especially for Raman spectroscopy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020606
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  • 3
    Electronic Resource
    Electronic Resource
    Method for the measurement of absolute Raman scattering cross sections of crystalline powders (1976)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 4 (1976), S. 253-268 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The theory of the Raman intensity of crystal powders given by Schrader and Bergmann [8] describes the radiation balance of a turbid medium by a scattering module r, an absorption module a and a Raman scattering module s. On the base of this theory the necessary experimental conditions and the evaluation procedure for the determination of absolute Raman scattering cross sections are given.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250040307
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  • 4
    Electronic Resource
    Electronic Resource
    Raman optical activity of enantiomorphic single crystals (1995)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 26 (1995), S. 877-882 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Conventional Raman and incident circular polarization Raman optical activity (ROA) spectra are presented for the lattice vibrations of enantiomorphic pairs of optically active cubic crystals NaBrO3 and NaCIO3 in depolarized right-angle scattering (65-145 cm-1) and unpolarized backscattering (55-200 cm-1). Since enantiomorphic cubic crystals are also piezoelectric owing to the lack of a centre of inversion, the degeneracy of their triply degenerate polar (infrared and Raman active) F phonons is partially lifted because of long-range dipole-dipole interactions. Therefore, non-degenerate longitudinal and doubly degenerate transverse optical phonons can be separately observed in the ROA spectra.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250260839
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