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  • 1985-1989  (8)
  • 1986  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Dispersive triplet excitation transport in organic glasses (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 3567-3572 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Time dependent transport of triplet excitations in amorphous benzophenone, anthraquinone, and phenanthrene has been investigated in the temperature range 4.2 K≤T≤100 K by monitoring diffusion-controlled decay of the inhomogeneously broadened 0–0 phosphorescence band of bulk states. The results are in excellent agreement with both the analytic theory of Grünewald et al. and computer simulation of nonequilibrium transport. They indicate the applicability of a stochastic transport model based on asymmetric hopping rates with unrestricted energy relaxation. The time dependence of the ensemble averaged hopping frequency has been determined within three decades of time. It can be approximated by a ν(t)∼(t/t0)α−1 law with time dependent dispersion parameter α.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450243
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Semiempirical treatment of the benzophenone molecule as a function of twist angle (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1590-1597 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The benzophenone molecule has been treated in MNDO, MNDOC, and MINDO/3 approximation as a function of the twist angle α of the phenyl rings. Calculated were (i) the energies of S0 and T1 state, (ii) delocalization of the n and π* orbitals involved in the 3nπ* state, (iii) net atomic charges,(iv) the force constants of the C=O vibration in the S0 and T1 state, respectively, (v) vertical transition energies for T1←S0 and S1←S0, and (vi) the position of upper triplet states. The results are discussed in relation to the spectroscopic properties of the T1 state of a vitreous benzophenone phase. It is concluded that diagonal disorder is due to a significant fluctuation of α causing both a spread of the site energies of the glass-forming molecules and a variation of spin-orbit coupling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450452
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1986)
    Springer
    European journal of nutrition 25 (1986), S. 123-127 
    Details
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020742
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Vitamin A and ciliated cells I. Respiratory epithelia (1986)
    Springer
    European journal of nutrition 25 (1986), S. 114-122 
    Details
    ISSN: 1436-6215
    Keywords: ciliated cells ; tracheobronchial tract ; scanning electron microscopy ; vitamin A deficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Zusammenfassung Um zu prüfen, in welcher Weise Vitamin A zilientragende Epithelien beeinflußt, wurde untersucht, ob zilientragende Epithelien im Vitamin-A-Mangel besondere Veränderungen aufweisen. Die untersuchten Gewebe beinhalten das Respirationsepithel sowie die zilientragenden Sinnesepithelien des Innenohres, der Zunge und des Riechepithels. Dieser Teil beschreibt die Veränderungen des zilientragenden Epithels des Tracheobronchialtraktes in Relation zum Vitamin-A-Status. Mit rasterelektronenmikroskopischen Methoden konnte im Vitamin-A-Mangel ein fleckiger Verlust von Zilien des Respirationsepithels beobachtet werden, bevor es zu einer squamösen Metaplasie des Gewebes — wie sie im Vitamin-A-Mangel beschrieben ist — kam. Die rasterelektronenmikroskopischen Aufnahmen stellen die Veränderungen an den zilientragenden Zellen dieses Epithels anschaulicher dar, als dies mit transmissionselektronenmikroskopischen Verfahren möglich ist.
    Notes: Summary To estimate the role of vitamin A on ciliated cells we investigated whether ciliated cells undergo any alteration during vitamin A deficiency. The epithelia examined include the ciliated cells of the respiratory tract and the ciliated sensory cells of the inner ear, the tongue, and the olfactory cells. This part of the paper will describe the ciliated epithelium of the tracheobronchial tract and its relation to vitamin A status. During vitamin A deficiency a partial loss of ciliae can be observed before any squamous metaplasia (which usually occurs during longer lasting vitamin A deficiency) develops. The scanning electron microscopic data illustrate the altered surface of the epithelium during vitamin A deficiency better than transmission electron microscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020741
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  • 5
    Electronic Resource
    Electronic Resource
    On the definition of central pattern generator and its sensory control (1986)
    Springer
    Biological cybernetics 54 (1986), S. 65-69 
    Details
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract A central pattern generator (CPG) is defined here as a neural network responsible for the production of the timing cues of a rhythmic motor output pattern in the isolated CNS. For the intact animal, model considerations show that this term is neither clearly delimited from the concept of a reflex chain nor from the concept of a pattern generator with functional principles different from those of the CPG. Therefore, it cannot be concluded from the existence of a CPG in the isolated nervous system that this CPG also provides the decisive timing cues in the intact animal. Consequences for the study of the neural basis of rhythmic movements are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337116
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  • 6
    Electronic Resource
    Electronic Resource
    Afferent control of walking movements in the stick insectCuniculina impigra (1986)
    Springer
    Journal of comparative physiology 158 (1986), S. 351-362 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. When a rampwise stretch of large amplitude is applied to the prothoracic femoral chordotonal organ of an active, decerebrate stick insect, usually the first muscles to be activated are the ‘stance phase muscles’, the flexor tibiae, the retractor unguis, and the retractor coxae. Later during the stimulus when the chordotonal organ signals a fairly flexed joint position, the activity of these muscles declines and the ‘swing phase muscles’, the extensor tibiae and the protractor coxae, become active. This sequence takes place in an active animal and is referred to here as response type 1. The same sequence, but with weaker reactions, may occur in an inactive animal (response type 2). There is a gradual transition between these response types and a pure resistance reflex like that shown by a resting, intact animal (response type 4 in an inactive animal; response type 5 in an active animal). 2. Stimulation of the campaniform sensilla or increasing the angle of the subcoxal joint can also elicit response type 1 and 2. 3. During response types 1 and 2 the electrical activity of the muscles and motor neurons involved appears the same as at the end of a stance phase and the transition to a swing phase. 4. In response types 1 and 2 the FETi soma is first hyperpolarized and then strongly depolarized. The common inhibitor (CI) soma responds with a brief depolarization at the onset of stimulation and a longer lasting depolarization at stimulus offset. 5. The existence of response type 2 indicates that the pattern generator for foreleg walking can be in a state in which it is not generating a walking pattern by itself, but can be induced to produce part of a step by appropriate stimulation. Thus, under these conditions it acts like a reflex center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00603619
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  • 7
    Electronic Resource
    Electronic Resource
    Electrically induced fusion of different human cell types (1986)
    Springer
    Journal of neurology 233 (1986), S. 153-156 
    Details
    ISSN: 1432-1459
    Keywords: Dielectrophoresis ; Charge pulse fusion ; Human cell types ; CSF cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The fusion of human cells of the cerebrospinal fluid and of the peripheral blood is reported, as well as the fusion of these cells with tomato protoplasts. The cells were fused by applying short-time electric pulses after dielectrophoretic collection. The importance of this method for diagnosis and therapy is discussed and possible applications are mentioned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314422
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  • 8
    Electronic Resource
    Electronic Resource
    Afferent control of walking movements in the stick insectCuniculina impigra (1986)
    Springer
    Journal of comparative physiology 158 (1986), S. 345-349 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. On a motor-driven treadband decerebrateCuniculina usually walked regularly, but only forwards. Animals having only the two forelegs showed the same behavior. Decerebrate animals with just the two hindlegs walked only backwards. 2. In the duration of the electrical activity of the depressor and levator muscles of the trochanter and the extensor and flexor muscles of the tibia, there was no significant difference between the forward walking forelegs of these animals and the active walk of the forelegs of an intact insect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00603618
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