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  • 1
    Electronic Resource
    Electronic Resource
    Laser photochemistry with polarized light in low-temperature glasses (1985)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 89 (1985), S. 2473-2477 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100258a010
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  • 2
    Electronic Resource
    Electronic Resource
    High resolution frequency selective photochemistry of phycobilisomes at cryogenic temperatures (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 871-874 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Highly frequency selective photochemistry at cryogenic temperatures is used to gain information on the excited state dynamics of large biomolecular aggregates, the phycobilisomes from the blue–green alga (cyanobacterium) Masticogladus laminosus. In particular, we show that in spite of the well organized structure of these aggregates disorder on a microscopic level dominates the optical spectra. The hole burning reaction in the resonantly excited chromophores is most probably due to a conformational change in the neighborhood of the chromophore. From the widths of the holes energy transfer times between different pigments on the order of 16 ps are determined. These transfer times are independent of the excitation energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455209
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  • 3
    Electronic Resource
    Electronic Resource
    Probing of conformational relaxation processes of proteins by frequency labeling of optical states (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 1270-1273 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We show how optical frequency labeling at cryogenic temperatures can be used to probe in a most direct way protein substates and to elucidate the nature of the structural relaxation processes involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456131
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  • 4
    Electronic Resource
    Electronic Resource
    Temporal intensity modulation of spectral lines in a low-frequency discharge in argon (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 3855-3862 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The time-dependent modulation of the emission intensities of several Ari and Arii spectral lines was measured with the time-to-amplitude conversion method for an argon discharge at 50 kHz occurring between the electrodes of an asymmetric parallel plate etch reactor. Under the assumptions that the life time of an emitting state is short compared to the electric field period and that the state is populated by electron impact from the ground state, the line intensity becomes proportional to the corresponding excitation rate coefficient. This time-dependent rate coefficient is calculated from the electron energy distribution obtained by solving the quasistationary Boltzmann equation where the plasma electric field is taken to be proportional to the measured electrode potential. Good agreement between the time dependencies of measured and calculated line intensities is achieved for the selected 6d(1/2)01 →4p(1/2)1 transition in Ari if the amplitude of the plasma field is adjusted to 13 V/cm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341366
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  • 5
    Electronic Resource
    Electronic Resource
    Comparisons of Isozyme Patterns in Resynthesized Amphihaploid Rapeseed (Brassica napus) and Their Parental Species Brassica campestris and Brassica oleracea (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 103 (1989), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Resynthesized rapeseed plants produced by embryo culture and the progeny of their selfed parents from Brassica oleracea and Brassica campestris were analyzed by starch gel electrophoresis staining of enzymes GPI, LAP and SDH. In at least one unequivocal case it could be proved for each enzyme system studied that the alleles of both parents arc independently expressed in the newly synthesized individuals and that in the pattern of the dimeric enzyme GPI interlocus bands of the homoeologous loci arc visible. Comparisons with enzyme patterns in cultivated B. napus leads to the conclusion that in general active enzyme loci of both parental genomes are present. This is of great significance in estimating slide frequencies, degree of heterozygosity and other genetic parameters of B. nupus populations/cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1989.tb00382.x
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  • 6
    Electronic Resource
    Electronic Resource
    Stability of frequency domain information bits in amorphous organic materials (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3232-3240 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigate the stability of frequency domain information bits as a function of time and temperature fluctuations. A large body of experimental results for a variety of organic materials is presented and analyzed in terms of phenomenological models on spectral diffusion and dispersive kinetics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344114
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  • 7
    Electronic Resource
    Electronic Resource
    Probing of extremely low configurational barriers in an organic glass (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6655-6657 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By measuring the reduction of a spectral hole burnt at 500 mK due to temperature cycling experiments, we show that the lower bound of the distribution function of barrier heights is below 10 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454405
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  • 8
    Electronic Resource
    Electronic Resource
    Investigation of polarization diffusion and relaxation dynamics of low temperature glasses (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 2935-2938 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We investigated the optical anisotropy and the normalized areas of persistent spectral holes in organic glasses over almost 1 week (4 decades). The systems studied were 1,4-dihydroxyanthraquinone and tetracene in an EtOH/MeOH glass. The areas of the holes decay on a logarithmic time scale, but the anisotropy remains constant. We draw the following conclusions: (i) There is no reorientation of dye molecules in the glass. (ii) Molecules relaxing from the product state reassume the position in the frequency domain and in space which they had before hole burning. (iii) A dye molecule seems to be strongly coupled just to one two level system (TLS).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448241
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  • 9
    Electronic Resource
    Electronic Resource
    Negative phototaxis inDrosophila associated with a morphological change in the compound eye (1985)
    Springer
    Cellular and molecular life sciences 41 (1985), S. 611-612 
    Details
    ISSN: 1420-9071
    Keywords: Drosophila melanogaster subgroup ; phototaxis, negative ; eye, compound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The ultrastructure of the compound eyes of several photonegative selection lines and their unselected photopositive controls of five species of themelanogaster subgroup was analyzed. A qualitative phenotypic change concerning the rhabdomeres in one of the photonegative selection lines ofD. mauritiana could be detected. It was proved that this structural aberration of the rhabdomeres is caused by a parallel mutation of the mutantora (outer rhabdomeres absent) ofD. melanogaster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02007682
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  • 10
    Electronic Resource
    Electronic Resource
    Responses of the spinal α-motoneurone-Renshaw cell system to various differentially distributed segmental afferent and descending inputs (1985)
    Springer
    Biological cybernetics 51 (1985), S. 417-426 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A previously presented multi-loop model of the mammalian spinal α-motoneurone-Renshaw cell system was extended to incorporate different physiological input patterns: Ia fibres from primary muscle spindle endings, spinal input systems descending in the ventral quadrant and from the nucleus ruber. The main goal of the computer simulation calculations was to present a number of dynamic input-output relations between these inputs which are distributed inhomogenously to different types of α-MNs (that is, S-, FR-, and FF-type MNs) and the outputs of pools of the latter, for the purpose of experimental testing. The main outcome was that the phase relations of the outputs of the different types of MNs depend very much on the overall strength of recurrent inhibition, such that small changes of this strength, which appears to be small anyway, can significantly alter these phase relations. Since this strength is alterable through descending and segmental afferent inputs, this provides a physiological means of phase-decorrelation although it is unlikely to put the discharges of different MN types totally out of phase (by about 180°). Also, the inhomogeneity of recurrent inhibition would help to prevent a strong phase separation of this kind. Yet a decorrelation at the microscopic level could help suppress physiological tremor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350782
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