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  • 1990-1994  (9)
  • 1950-1954
  • 1900-1904
  • 1991  (9)
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  • 1990-1994  (9)
  • 1950-1954
  • 1900-1904
Year
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  • 1
    Electronic Resource
    Electronic Resource
    Proteins and glasses: A comparative study of spectral diffusion phenomena (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 3134-3136 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We compare the spectral diffusion broadening of mesoporphyrin substituted horseradish peroxidase with the chromophore doped host glass. Whereas the broadening in the glass is smooth and follows a power law with an exponent close to (3)/(2) , there is a a steplike broadening in the protein which occurs around 14 K. The observed phenomena are interpreted on the basis of a two domain interaction of the chromophore with its environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461780
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Color effects in pressure-tuned hole-burned spectra (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7619-7624 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We applied hydrostatic pressure to spectral holes burned into a resorufin doped ethanol/methanol glass. We found that the line shift is perfectly linear with pressure and showed a pronounced dependence on the burn frequency as predicted by theory [J. Chem. Phys. 90, 3274 (1989)]. We exploited the burn frequency dependence to determine the solvent shift of the dye probe and the compressibility of the alcohol glass used. On the other hand, the behavior of the hole width under pressure shows features not predicted by theory: The broadening is, like the line shift, dependent on the burn frequency within the inhomogeneous band, yet in a nonlinear fashion. We attribute the color effect in the pressure induced broadening of the hole to a breakdown of the Gaussian approximation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460148
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photochemical holes under pressure: Compressibility and volume fluctuations of a protein (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 8600-8603 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: From the pressure induced frequency shift of photochemical holes burnt into mesomorphyrin substituted horseradish peroxidase, we determined the compressibility of the protein and the vacuum frequency of the chromophore. From the compressibility, an estimation of the volume fluctuations of the biomolecule is possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460042
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    On the distribution of reactive barriers in disordered materials (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 189-194 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigated the hole-burning photoreaction of a dye complex in alcohol glass which undergoes both photochemical and photophysical transformations. By measuring separately the disappearance of the photoproduct at the respective wavelength ranges under thermal cycling conditions, we found that the photochemically transformed species recovered according to a Gaussian distribution of barrier heights, whereas the photophysically transformed species recovered in accordance with a 1/(V)1/2 distribution. It is suggested that this behavior is rather general and is intimately related to the nature of the phototransformation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461474
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Relaxation phenomena of a triplet spin probe in glassy and crystalline o-terphenyl (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 1053-1057 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100156a007
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Hebammen forschen — ein Überblick (1991)
    Springer
    Archives of gynecology and obstetrics 250 (1991), S. 824-828 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02372902
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Evolution und Züchtung des Saatweizens (Triticum aestivum L.) (1991)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 21 (1991), S. 248-254 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Seitdem der abendländische Mensch erkannt hatte, daß sich Getreidekörner, besonders die des Weizens, zur Mehl- und Brotherstellung eignen, ist er auf Gedeih und Verderb mit dieser Pflanzenart verbunden. Ohne den Einfluß des Menschen wären die Kulturformen von Weizen, Reis, Gerste, Hafer und Mais nicht denkbar. War er es doch, der entscheidend dazu beigetragen hat, daß sich im Laufe von Jahrtausenden unsere wichtigsten Getreidearten von ehemals spindelbrüchigen Gräsern, deren Samen nach der Reife auf den Boden fielen, Schrittweise zu zähspindeligen, nichtährenbrüchigen Hochleistungs-Nutzpflanzen umwandelten.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19910210509
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Topokinetics of the polyene formation in PVC films during treatment with non-oxidative plasma (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 51-52 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420117
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Plasmaätzen dünner Schichten organischer Polymere. Teil IX: Temperaturabhängigkeiten der Ätzrate von Polymeren verschiedener Struktur (1991)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 42 (1991), S. 289-293 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The investigation of the temperature dependence of polymer etching rates in an oxygen plasma was extented to some more polymers. The complex nature of the etching process becomes obvious, because the temperature dependences are often nonlinear. Characteristic changes in the slope of the curves correspond only in some cases with the glass temperature of the polymers. Therefore these points can also be connected with the formation and etching of adsorption layers. Activation energies of partial processes were determined. Based on the temperature dependence, only some general conclusions on the plasma etching mechanism could be derived.
    Notes: Die Untersuchung von Temperaturabhängigkeiten der Plasmaätzrate von Polymeren im Sauerstoffplasma wurde auf weitere Polymere ausgedehnt. Die Temperaturabhängigkeit der Plasmaätzrate ist teilweise sehr unterschiedlich, was auf einen sehr komplexen Mechanismus des Ätzprozesses hindeutet. Charakteristische Knickpunkte in den Kurven konnten nur in einigen Fällen mit der Glastemperatur des Polymers in Verbindung gebracht werden. Möglicherweise werden diese Knickpunkte auch durch Abtrag und Bildung von Adsorptionsschichten hervorgerufen. Aktivierungsenergien von Teilprozessen wurden bestimmt. Aus den Temperaturabhängigkeiten allein ließen sich nur allgemeine Schlußfolgerungen über den Mechanismus des Plasmaätzens der einzelnen Polymere ableiten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1991.010420613
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    Paper (German National Licenses)
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