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  • 1
    Electronic Resource
    Electronic Resource
    Effects of Substance P on Secretion of Catecholamines from Populations of Bovine Chromaffin Cells and on Calcium Transients in Individual Cells (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 632 (1991), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1991.tb33112.x
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular and Genetic Analysis of Toxin Production by Pathovars of Pseudomonas Syringae (1991)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Phytopathology 29 (1991), S. 247-278 
    Details
    ISSN: 0066-4286
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.py.29.090191.001335
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  • 3
    Electronic Resource
    Electronic Resource
    Statistical multifragmentation (1994)
    Springer
    The European physical journal 349 (1994), S. 291-296 
    Details
    ISSN: 1434-601X
    Keywords: 24.60 ; 24.75
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two scenarios for the fragmentation of nuclei in collisions at intermediate energies are conceivable: A fast direct “shattering” or “abrasion — ablation” of a cluster has frequently been proposed in high-energy nuclear collisions. On the other hand there is an increasing number of data that suggest a nearly complete equilibration of the excited system before it breaks “simultaneously” into several pieces. The size-distribution, the size-correlations, the energy-spectra as well as the angular distributions are consistent with a loss of memory of the entrance channel. Because the latter scenario is ruled by the accessible phase-space and therefore by thermodynamics of a closed small system, which is a challenging problem of its own right, we treat only thestatistical fragmentation of small equilibrized sources. A very similar situation is expected of the fragmentation of multiply charged metal clusters like Na n z+ . With the help ofMicrocanonical Metropolis-Monte Carlo (MMMC) we study multifragmentation as a realistic example of thermodynamics of a finite many-body system subjected to long-range forces using the most basic prinicples of statistical physics. MMMC is an alternative to molecular dynamics but it has the advantage that one only samples the final states one is interested in and to get the relevant branching ratios.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01288977
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  • 4
    Electronic Resource
    Electronic Resource
    Higher order fields at crack and notch tips in power-law materials under longitudinal shear (1994)
    Springer
    Archive of applied mechanics 64 (1994), S. 509-518 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Untersucht werden singuläre Felder und Felder höherer, Ordnung an Spitzkerben unter nichtebener Schubbelastung in Materialien mit Potenzgesetz. Die Eigenwerte werden mittels der Störungsrechnung ermittelt. Die Bestimmung der Eigenlösungen höherer Ordnung erfolgt unter Verwendung der dominierenden singulären Lösung. Einige Beispiele, die auch den Spezialfall des Risses einschließen, werden für unterschiedliche Randbedingungen diskutiert.
    Notes: Summary Singular fields and higher order fields near a sharp notch in a power-law material under longitudinal shear are investigated. Using the perturbation method the whole set of eigenvalues is determined. The higher order eigensolutions are constructed by use of the dominant singular solution. Some examples, including the special case of a crack are discussed for different boundary conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00788883
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  • 5
    Electronic Resource
    Electronic Resource
    The interaction of a straight crack with a center of dilatation (1992)
    Springer
    Archive of applied mechanics 62 (1992), S. 134-145 
    Details
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Übersicht Es wird die Wechselwirkung zwischen einem geradem Riß und einem Dilatationszentrum in einer unendlichen elastischen Ebene untersucht. Für die Spannungsintensitätsfaktoren, die verallgemeinerten Wechselwirkungskräfte und für das Potential des Systems werden Lösungen in analytischer Form hergeleitet. Daneben wird für den Fall des partiellen Rißschließens das Kontaktproblem für die Grenzfälle ideal glatter bzw. ideal rauher Rißflanken gelöst.
    Notes: Summary The interaction of a straight crack with a center of dilatation in an infinite elastic plane is investigated. Analytical solutions for the stress intensity factors, the generalized interaction forces and the potential of the system are derived. Furthermore, the contact problem, arising in the case of partial crack clusore, is solved for the limit cases of frictionless and of ideally rough crack faces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00808736
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  • 6
    Electronic Resource
    Electronic Resource
    3D elastodynamic crack analysis by a non-hypersingular BIEM (1992)
    Springer
    Computational mechanics 9 (1992), S. 137-152 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A boundary integral equation method (BIEM) is presented for 3D elastodynamic crack analysis. The method is based on a non-hypersingular BIE formulation, where the unknown quantities are the crack opening dispacements and their derivatives. The numerical scheme applied here uses a constant shape function for elements away from the crack front, and a “square-root” crack-tip shape function for elements near the crack front to describe the proper behavior of the unknown quantities at the crack front. A collocation method is applied to convert the non-hypersingular BIEs to a system of linear algebraic equations which are solved numerically. For several geometrical configurations, numerical results are presented for both the elastodynamic stress intensity factors and the scattering cross section. They are in good agreement with those obtained by other authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00370068
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance microscopy of multicomponent polymeric materials (1993)
    Springer
    Journal of materials science 12 (1993), S. 728-731 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00626700
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  • 8
    Electronic Resource
    Electronic Resource
    Interaction of antiplane cracks with elastic waves in transversely isotropic materials (1993)
    Springer
    Acta mechanica 101 (1993), S. 231-247 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The interaction of plane time-harmonic SH-waves with micro-cracks in transversely isotropic materials is investigated. Elastic wave scattering by a single micro-crack is first analyzed. The scattered displacement is expressed as a Fourier integral containing the crack opening displacement. By using this representation formula and by invoking the traction-free boundary condition on the faces of the crack, a boundary integral equation for the unknown crack opening displacement is obtained. Expanding the crack opening displacement into a series of Chebyshev polynomials and adopting a Galerkin method, the boundary integral equation is converted into an infinite system of inear algebraic equations for the expansion coefficients which is solved numerically. Numerical results are presented for the elastodynamic stress intensity factors, the scattered far-field and the scattering cross section of a single crack. Then, propagation of plane time-harmonic SH-waves in a transversely isotropicmaterial permeated by a random and dilute distribution of micro-cracks is investigated. The effects of the micro-crack density on the attenuation coefficient and the phase velocity are analyzed by appealing to a simple energy consideration and by using Kramers-Kronig relations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01175608
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  • 9
    Electronic Resource
    Electronic Resource
    Microscopic calculation of the surface absorption in the optical potential (1990)
    Springer
    The European physical journal 336 (1990), S. 57-62 
    Details
    ISSN: 1434-601X
    Keywords: 25.40.Cm ; 25.40.Dm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We calculated the contributions of the two-particle one-hole (2p-1h) and the one-particle two-hole (1p-1h) excitations to the imaginary partW(E, R) of then-40Ca optical potential. The bound single particle states and energies of the40Ca nucleus are calculated quantum mechanically by solving the Schrödinger equation with a Woods-Saxon potential. For the excited states in the continuum we use the Thomas-Fermi approximation. Different forms of contact residual interactions have been tested. A combination of aδ-force and a smeared SDI can fit the phenomenologicalW(E, R).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01904163
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  • 10
    Electronic Resource
    Electronic Resource
    Amino acid conjugates as metabolites of the plant growth regulator dihydrojasmonic acid in barley (Hordeum vulgare) (1991)
    Springer
    Journal of plant growth regulation 10 (1991), S. 17-25 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The biotransformation of [2-14C](±)9, 10-dihydrojasmonic acid (DJA) was studied in excised shoots of 6-day-old barley seedlings after 72 h. From the ethyl acetate extract, some minor metabolites were isolated and purified by DEAE-Sephadex A-25 chromatography, thin-layer chromatography (TLC), C18-cartridges, and high-performance liquid chromatography (HPLC). The structural identification of these metabolites was performed by gas chromatography-mass spectrometry (GC-MS), circular dichroism (CD), and amino acid analysis, and the following amino acid conjugates were found:N-[(−)9,10-dihydrojasmonoyl]valine,N-[(−)9,10-dihydrojasmonoyl]isoleucine,N-[9,10-dihydrojasmonoyl]leucine,N-[11-hydroxy-9,10-dihydrojasmonoyl]valine,N-[11-hydroxy-9,10-dihydrojasmonoyl]isoleucine,N-[12-hydroxy-9,10-dihydrojasmonoyl]isoleucine; and the cucurbic acid-related compoundsN-{[3-hydroxy-2(4-hydroxypentyl)-cyclopent-1-yl]-acetyl}isoleucine andN-{[3-hydroxy-2(5-hydroxypentyl)-cyclopent-1-yl]-acetyl}isoleucine. The results suggest conjugation with isoleucine and valine, as well as preferential hydroxylation at position C-11 or hydrogenation at position C-6, as being important steps in the metabolism of (±)DJA in barley shoots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279306
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