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  • 1
    Electronic Resource
    Electronic Resource
    A stable blue-light-derived signal modulates ultraviolet-light-induced activation of the chalcone-synthase gene in cultured parsley cells (1989)
    Springer
    Planta 177 (1989), S. 228-236 
    Details
    ISSN: 1432-2048
    Keywords: Blue light ; Cell culture (gene regulation) ; Chalcone synthase ; mRNA transcription ; Petroselinum (cell culture) ; Photoreceptor ; Signal transduction chain ; Transcription (regulation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Run-off transcription assays were used to demonstrate that both the ultraviolet (UV)-B and blue-light receptors control transcription rates for chalcone-synthase mRNA in the course of light-induced flavonoid synthesis in parsley (Petroselinum crispum Miller (A.W. Hill)) cell-suspension cultures. Blue and red light alone, presumably acting via a blue-light receptor and active phytochrome (far-red absorbing form) respectively, can induce accumulation of chalcone-synthase mRNA. The extent of the response is however considerably smaller than that obtained when these wavebands are applied in combination with UV light. A preirradiation with blue light strongly increases the response to a subsequent UV pulse and this modulating effect of blue light is stable for at least 20 h. The modulating effect is abolished by a UV induction but can be reestablished by a second irradiation with blue light.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392811
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  • 2
    Electronic Resource
    Electronic Resource
    Higher order radiative corrections to the QED Compton events at HERA (1991)
    Springer
    The European physical journal 52 (1991), S. 655-658 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We estimate the higher order QED corrections to the QED Compton events at HERA employing the leading logarithmic approximation to all orders in α. The Compton events are events of the typee+p→e′+γ+ Hadrons, wheree′ and γ have nearly balancedp T .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01562340
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  • 3
    Electronic Resource
    Electronic Resource
    Unitary approximation for radiative high energy scattering processes: Application to Bhabha scattering (1991)
    Springer
    The European physical journal 50 (1991), S. 75-84 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe how to apply the unitary approximation to high energy scattering processes which involve the radiation of arbitrarily many photons. We compare our results to calculations of inclusive quantities using leading log resummation techniques well known from QCD. In contrast to the latter method the unitary approximation is also appropriate for differential cross sections. The Monte Carlo implementation of the method is discussed and detailed results are given for the case of radiative Bhabha scattering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01558560
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  • 4
    Electronic Resource
    Electronic Resource
    Bounds on the coupling parameters for vector mesons in the Relativistic Random Phase Approximation (1990)
    Springer
    The European physical journal 335 (1990), S. 471-472 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Relativistic Random Phase Approximation for a meson-nucleon field theory with vector mesons is cast into an exactly soluble model. This allows to derive bounds on their couplings from consistency conditions without malting use of perturbative expansions. We find that the coupling used to fit low energy properties requires a strong suppression ofN−¯N-states by suitable cut offs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290195
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  • 5
    Electronic Resource
    Electronic Resource
    The second normal stress difference for pure and highly filled viscoelastic fluids (1992)
    Springer
    Rheologica acta 31 (1992), S. 294-305 
    Details
    ISSN: 1435-1528
    Keywords: Second normal stress difference ; concentrated suspensions ; coneand-plate rheometer ; steady shear
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract In the present work the measurement and description of the second normal stress difference in pure viscoelastic fluids and in suspensions of these fluids is discussed. The various measurement methods implemented to date are described briefly. Following this, the cone-and-plate distance method, which was introduced by Jackson and Kaye, is discussed. The analysis method of this experimentally relative simply implemented technique is modified. This is done by assuming that the ratio ψ* of the second normal stress difference to the first is independent of shear rate. This permits the precalculation of the measured function with ψ* as a curve parameter. The best possible fit of the measurement leads to the determination of ψ*. This method is used to measure the normal stress ratio of pure polyisobutene and of a 34.5% suspension of the same fluid. The result for the pure fluid matches literature values; ψ* of the suspension was found to have negative sign, as for the pure fluid, but to be of much greater magnitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00366508
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  • 6
    Electronic Resource
    Electronic Resource
    Bounds on the coupling parameters in field theoretical models of nuclear physics (1990)
    Springer
    The European physical journal 335 (1990), S. 341-348 
    Details
    ISSN: 1434-601X
    Keywords: 21.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate a simple meson-nucleon field theory in relativistic random phase approximation. To avoid perturbative expansions, the relativistic random phase approximation is cast into an exactly soluble model invented by Zachariasen. To make the model well defined, it is necessary to cut off nucleon-antinucleon states with invariant mass 〉λ. This is achieved by introducing form factors in a consistent way. Still the elimination of unphysical ghost states implies a bound on the square of the coupling constant, which is discussed as a function of the cut off. We find that the coupling used to fit low energy properties requires a strong suppression ofN- $$\bar N$$ -states. These results do not depend on the renormalization scheme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304713
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  • 7
    Electronic Resource
    Electronic Resource
    Consistency of effective, relativistic four-point interactions for nuclei (1991)
    Springer
    The European physical journal 338 (1991), S. 113-114 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We derive consistency conditions for effective field theoretic models for nuclei with four-fermion couplings. The transformation properties of these consistency conditions under the renormalization group are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279122
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  • 8
    Electronic Resource
    Electronic Resource
    On the relaxation of shear and normal stresses of viscoelastic fluids following constant shear rate experiments (1990)
    Springer
    Rheologica acta 29 (1990), S. 261-280 
    Details
    ISSN: 1435-1528
    Keywords: Relaxation ; first normalstress difference ; Gaussianerror function ; stress test ; cone and platerheometer ; mirror relation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Abstract By means of a cone and plate rheometer the relaxation of the shear stress and the first normal stress difference in polymer liquids upon cessation of a constant shear rate were examined. The experiments were conducted mostly in a high shear rate region of relevance for the processing of these materials. The relaxation behavior at these shear rates can only be measured accurately under extremely precise specifications of the rheometer. To determine under which conditions the integral normal thrust is a convenient measure for the relaxing local first normal stress difference the radial distribution of the pressure in the shear gap was measured. The shape of relaxation of both the shear stress and the first normal stress difference could be closely approximated for the entire measured shear rate and time range by a two parameter statistical function. In the range of measured shear rates, one of the parameters, the standard deviationS, is equal for the shear and the normal stress, and is independent of the shear rate within the limit of experimental error. The second parameter, the mean relaxation timet′ 50,τ of the shear stress andt′ 50,σ of the first normal stress difference, can be calculated approximately from the viscosity function and only a single relaxation experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01339883
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on microplasmodia of Physarum polycephalum (1991)
    Springer
    Cell & tissue research 264 (1991), S. 283-291 
    Details
    ISSN: 1432-0878
    Keywords: Actin fibrils ; Contractility ; Phalloidin staining ; Morphometry ; Physarum polycephalum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Fragments excised from front regions of thinspread Physarum plasmodia were used to examine a possible correlation between the periodical dynamic activity of such specimens and the spatial organization of actin fibrils. Under isotonic conditions, symmetrical contractions and relaxations of the entire fragment alternate with a period of 1–4 min, whereas under isometric conditions local contractions and relaxations occur simultaneously in different regions of the same specimen. Rapid fixation and phalloidin-staining at distinct stages of the contraction-relaxation cycle demonstrates the permanent existence of cytoplasmic actin fibrils under both isometric and isotonic conditions. During the transition from relaxation to contraction the fibrils shorten in length from 25.5 μm to 21.0 μm and increase in density from 1.2 fibrils/1000 μm2 to 2.3 fibrils/1000 μm2. The present results demonstrate that actin fibrils in Physarum plasmodia are not completely decomposed and reformed every contraction-relaxation cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313965
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  • 10
    Electronic Resource
    Electronic Resource
    1,2,3-Triazine, III Synthese von N-Aminopyrazolen und deren Oxidation zu 1,2,3-Triazinen. Molekülstruktur des 1,2,3-Triazins (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1732-1751 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,2,3-Triazines, III. - Synthesis of N-Aminopyrazoles and their Oxidation to 1,2,3-Triazines. Molecular Structure of 1,2,3-TriazineOxidation of the N-aminopyrazoles 4a - i affords the 1,2,3-triazines 5a - i. Spectra and reactions - such as oxidation, reduction, and cycloaddition reactions - of some 1,2,3-triazines 5 are described. The X-ray analysis of 5a is presented.
    Notes: Die Oxidation der N-Aminopyrazole 4a - i liefert die 1,2,3-Triazine 5a - i. Es werden Spektren und Reaktionen - wie Oxidation, Reduktion und Cycloadditionen - einiger 1,2,3-Triazine 5 beschrieben. Die Röntgenstrukturanalyse für 5a wird angegeben.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519850903
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