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  • 1990-1994  (6)
  • 1993  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Spin-conversion relaxation in dimethyl-s-tetrazine doped n-octane: Deuteration and symmetry breaking (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1-6 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spectral hole burning is used to measure spin-conversion relaxation of methyl groups attached to a dye probe. The dye is dimethyl-s-tetrazine, the host is n-octane, which is, at low temperatures, a Shpol'skii-matrix. The temperature dependence of the spin-conversion relaxation follows the same pattern for the protonated and the perdeuterated methyl-rotor. However, the relaxation rates of the perdeuterated rotor are higher by almost two orders of magnitude. Partial deuteration destroys the rotor symmetry and leads to a breakdown of the correlation between nuclear spin and rotational wave function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465798
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A comparative pressure tuning hole burning study of protoporphyrin IX in myoglobin and in a glassy host (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 2478-2486 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We measured the behavior of spectral holes under isotropic pressure changes as a function of burn frequency. We compared a protein sample, namely protoporphyrin IX substituted myoglobin in a glycerol/water glass with a sample where the protoporphyrin IX was directly dissolved in a host glass. The differences are remarkable—holes in the pure glass behave as expected for a homogeneous isotropic material. It is the nonlinear frequency dependence of the pressure shift where the deviation of the protein sample is most obvious. These observations signal a correlation between the structures of the dye probe and the structures of the apoprotein. They further show that global parameters of the apoprotein, such as the isothermal compressibility, depend strongly on the associated conformational substates and are subject to unexpected large variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465210
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structural disorder and spin-lattice relaxation (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 605-609 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We measured the spin-lattice relaxation of the photoexcited triplet state of quinoxaline in variety of organic glasses and polymers as a function of temperature. The experiment covered the temperature range from a few K close to the glass transition. The remarkable thing is that the temperature dependence of the spin-lattice relaxation seems to be uniform for the various glassy and polymeric materials within the whole temperature range and seems to follow a quadratic temperature dependence. The only exception in polyethylene. There, the temperature dependence is much steeper but levels off above 40 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465732
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hot implantation of protons into GaAs: Transmission electron microscopy (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 4371-4374 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Implantation of hydrogen at 600 °C into GaAs at 8 keV and at high doses resulted in the formation of a two-layer structure. The topmost layer roughly extended in depth to the range of the protons and exhibited a high concentration of loops, hydrogen bubbles, decorated dislocations, and faults. Occasional microsplits on {110} were observed. The deeper layer contained pressurized hydrogen platelets on {111}. These results are critically compared with previous results obtained with cold implanted and subsequently annealed GaAs. The present observations are also discussed in relation to the theoretical treatment by d'Olieslaeger [J. Mater. Sci. 23, 2697 (1988)]. Estimates of the importance of arsine production are also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354404
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular interactions and correlation phenomena between pressure shift and solvent shift: a spectral hole-burning study (1993)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 97 (1993), S. 6902-6906 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100128a026
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  • 6
    Electronic Resource
    Electronic Resource
    Chromosome location of genes for resistance to powdery mildew in common wheat (Triticum aestivum L.) 1. Mlk and other alleles at the Pm3 locus (1993)
    Springer
    Euphytica 68 (1993), S. 223-229 
    Details
    ISSN: 1573-5060
    Keywords: common wheat ; Triticum aestivum ; resistance genes ; Erysiphe graminis tritici ; powdery mildew ; monosomic analysis ; allelism tests
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Several wheat cultivars/lines were inoculated with isolates of Erysiphe graminis tritici to identify new genes/alleles for resistance. The wheats were tested with 13 isolates that had been characterized from responses on differential lines with known resistance genes. Gene Mlk which occurs in cultivars ‘Kolibri’, ‘Syros’, ‘Ralle’ and several other European common wheats was found to be an allele at the Pm3 locus and is now designated Pm3d. The mildew resistance in an old Australian wheat, ‘W150’, is conferred by a single gene also allelic to Pm3 and now designated Pm3e. The near-isogenic line ‘Michigan Amber/8*Cc’ possesses another allele now designated Pm3f. A Syrian land variety of common wheat shows mildew resistance that is conditioned by the combination of genes Pm1 and Pm3a. Finally, two accessions of Triticum aestivum ssp. sphaerococcum appeared to possess the Pm3c allele.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029876
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