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  • 1
    Electronic Resource
    Electronic Resource
    Gain and excited singlet and triplet state absorption spectra of some 9-acetoxy-10(halogenoacetoxy)phenylanthracenes (1988)
    Springer
    Applied physics 46 (1988), S. 339-346 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.55M
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An apparatus for, optical gain spectra measurements is described, which has been used to determine the gain spectra of several halogen substituted derivatives of 9-acetoxy-10(2′-acetoxy)phenylanthracenes. Using the determinedS 1- andT 1-excited state absorption spectra and other spectroscopic data the gain spectrum have been computed. The changes of the determined laser parameters and spectroscopic data of the halogen substituted derivatives are discussed with reference to the intramolecular heavy atom effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686457
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the use of a focusing spectrometer with a Cambridge Electron Probe (1968)
    Springer
    Microchimica acta 56 (1968), S. 966-974 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein fokussierendes Röntgenstrahlenspektrometer wurde in einem Cambridge-Elektronenstrahlmikroanalysator eingebaut. Damit ergaben sich signifikante Verbesserungen der Peak-Höhen, der Peak-Hintergrundverhältnisse und der Auflösung. Die quantitative Leistung des Instruments wurde damit entsprechend vergrößert. Die sich aus der erhöhten Empfindlichkeit ergebenden Schwierigkeiten wurden diskutiert.
    Abstract: Résumé On a fixé un spectromètre à rayons X à focalisation une microsonde electronic Cambridge. Des progrès significatifs ont été obtenus en matière de maximums d'intensité, de rapports de pointes à fond et de résolution; les possibilités quantitatives de l'instrument s'en trouvent accrues en conséquence. Les difficultés qui découlent de la délicatesse de focalisation du spectromètre lors de son emploi avec des cristaux de haute résolution sont passées en revue.
    Notes: Summary A focusing X-ray spectrometer has been installed on a Cambridge Electron Probe. Significant improvements in peak intensities, peak to background ratios and resolution were obtained and the quantitative capabilities of the instrument correspondingly enhanced. The difficulties encountered due to increased focusing sensitivity are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01221164
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Pyrene excitation via resonance energy transfer from protein tryptophan reveals a fluidity gradient in liver microsomes (1993)
    Springer
    Journal of fluorescence 3 (1993), S. 237-239 
    Details
    ISSN: 1573-4994
    Keywords: Pyrene excimer formation ; resonance energy transfer ; tryptophan ; fluidity ; liver microsomes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Membrane fluidity measurements based on excimer formation of pyrene and pyrene derivatives as a measure of lateral diffusion yield a decreased fluidity in the presence of proteins [1,2]. It was the aim of our study to investigate whether the reduced excimer formation is due to a rigidifying effect of proteins on the whole membrane or if the fluorophore mobility is hindered mainly in the immediate protein environment. Resonance energy transfer in microsomal membranes between intrinsic tryptophan residues and pyrene was used to study the excimer formation rate in the vicinity of proteins. The excimer-to-monomer fluorescence ratio after excitation via resonance energy transfer decreased compared to that observed for the direct excitation. The results suggest that, because of the reduced fluidity in the neighborhood of proteins, pyrene and pyrenedodecanoic acid do not diffuse homogeneously in the membrane plane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00865269
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  • 4
    Electronic Resource
    Electronic Resource
    Specific molecular properties of organic solvents determine the fluorescence depolarization of DPH and TMA-DPH in membranes (1995)
    Springer
    Journal of fluorescence 5 (1995), S. 189-192 
    Details
    ISSN: 1573-4994
    Keywords: DPH ; TMA-DPH ; organic solvents ; membranes ; fluorescence depolarization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In pig liver microsomes and protein-free egg PC liposomes the effects of organic solvent molecules on the fluorescence depolarization of 1,6-diphenyl-1,3,5-hexatriene (DPH) and 1-[4-(trimethylamino)phenyl]-6-phenyl-hexa-3,5-triene (TMA-DPH) were investigated. Aromaticity, alkyl chain length, and stereometry of the solvent molecules are shown to determine the changes of fluorescence depolarization. A concentration-dependent decrease in the fluorescence anisotropy is obtained with aromatic molecules but not with aliphatic molecules. The decrease correlates with the increasing side chain length of alkylbenzenes for both fluorophors and both membrane systems. Benzene in microsomes deviates characteristically from this trend. Measurements of TMA-DPH reveal smaller changes of anisotropy but yield the same qualitative results. Moreover, it is possible to distinguish the effects of the different stereometric properties of the three xylene isomers on the fluorescence anisotropy of DPH. According to their alkyl chain length and their specific stereometry, they exert the strongest fluidizing effect of all solvents investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727538
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    Paper (German National Licenses)
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