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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 13 (1978), S. 255-260 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The windows in the absorption spectrum of a harmonic oscillator coupled to a bath can be given a two-parameter form identical to the Fano windows in the absorption cross section of an atom with an autoionizing state.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 437-443 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Gas chromatographic profiles ; n-Butylboronates ; Alkyl-oximes ; Primary prostaglandins ; 6-Keto prostaglandin F1α ; Thromboxane B2 ; Isomers of prostaglandin F1α ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This work describes the use of glass capillary columns (GCC) in the rapid concurrent analysis of primary prostaglandins (PGs) (e. g. PGE2, PGE2, PGF2α) and other functionally significant metabolites of arachidonic acid (AA) such as TXB2 and 6-keto PGF1α. The use of a new multistep mixed derivatization approach that generates the methyl esters of n-butylboronate, pentafluorobenzyloxime, trimethylsilyl ether derivatives of these compounds remarkably simplifies the GC profiling of the three main pathways of AA metabolism (PGs, thromboxane, and prostacyclin). Furthermore, isomeric species giving very similar or identical mass spectral patterns can be easily identified by their relative retention times on high efficiency capillary columns.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 65 (1997), S. 655-663 
    ISSN: 0020-7608
    Keywords: Fullerenes ; endohedral complexes ; rotational spectroscopy ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We propose a two-parameter model Hamiltonian to analyze the low-energy dynamics of endohedral C60 fullerene complexes such as Li+@C60, Na+@C60, CO@C60, LiF@C60, and LiH@C60. The simplicity of the model is a direct consequence of very strong constraints imposed by both high symmetry and close confinement conditions, on the spherical anisotropy of the guest-cage interaction. In the parameter space region expanded by the selected systems, the guest low-energy dynamics undergo transitions from almost free rotations to more or less hindered rotations. These dynamics produce very particular features in the low-temperature rotational spectra, which can be taken, therefore, as fingerprints of a particular guest-cage interaction.   © 1997 John Wiley & Sons, Inc. Int J Quant Chem 65: 655-663, 1997
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 8 (1981), S. 149-154 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The analytical approach described allows for the rapid screening and concurrent quantitative determination of all of the major metabolites of the cyclooxygenase pathway of arachidonic acid, including the primary prostaglandins PGE2, PGD2 and PGF2α in addition to the stable end-products of short-lived prostacyclin and thromboxane A2 (6-keto-PGF1αL and TXB2, respectively), generated by incubating arachidonic acid with mouse peritoneal macrophage cells. After derivatization into the corresponding methyl ester-methoxime-TMS derivative, the extracted endogenous compounds were analysed by combined high efficiency glass capillary column chromatography and selected ion monitoring. Comparatively lower detection limits can be achieved with the methyl ester-butylboronate-TMS derivatives (e.g. 10 pg for 6-keto-PGF1α). A brief account is also presented on a new type of mixed methyl ester-pentafluorobenzyloxime-butylboronate-TMS derivative of TXB2 and 6-keto-PGF1α.
    Additional Material: 5 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, N.Y. : Wiley-Blackwell
    Journal of Supramolecular Structure 5 (1976), S. 109-117 
    ISSN: 0091-7419
    Keywords: chloroplasts ; magnetic field orientation ; membranes ; photosystem-1 ; Life Sciences ; Molecular Cell Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: A technique is described for the preparation of oriented samples from spinach chloroplasts whose linear dichroism is then studied by (flash) absorption spectroscopy. The chloroplasts are suspended in a glycerol-containing medium, oriented in a magnetic field, and slowly cooled in the magnet until the medium is rigid enough to avoid disorientation effects.The absorption spectra in polarized light have been measured at -50° and -170°C. They allow the orientation of chlorophyll b to be resolved, and the red transition moment is found to be tilted out of the membrane plane.A study of the flash-induced absorption changes linked to Photosystem-1 activity reveals a progressive evolution of the difference spectra and of the linear dichroism with decreasing temperatures. At -170°C, the difference spectrum of P700 in the red is well resolved. All transition moments are found to be largely parallel to the membrane plane.The potential use of the technique for other experiments by differential absorption spectroscopy and by EPR techniques is discussed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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