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  • 1
    Electronic Resource
    Electronic Resource
    Terminal mycelial clusters of tree roots; Their nutritional importance (1980)
    Springer
    Plant and soil 54 (1980), S. 137-141 
    Details
    ISSN: 1573-5036
    Keywords: Absorption spectrophotometry ; Catalytic potential ; Cation exchange ; Ectoceulular mycorrhizae Ephemeral nature of mycorrhizal short roots ; H2O2-decomposing enzymes ; Manometric analyses ; Microscopic examinations ; Mycelial root clusters ; Mycoplasts ; Multimineral soils of pitted outwash ; Northern Wisconsin ; Pinus resinosa Pinus strobus ; Radiation and mycorrhiaal short roots ; Symbiotic tree nutrition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary This study was concerned with properties of mycelia-agglutinated terminal root clusters, or mycoplasts,' of naturally reproduced seedlings ofPinus resinosa andPinus strobus. These rhizospheric root appendages, formed at the expense of the host plant's carbohydrates, exhibited high catalytic potential, cation exchange capacity, and content of exchangeable bases, including complexible cations. These attributes suggest that mycelial clusters are important components of tree-fungus symbiotic mechanism that increase availability of nutrients to the trees. The mycelial clusters apparently perform the function of mycorrhizal short roots which are often nonexistent under the conditions of reduced radiation in well-stocked forest stands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182005
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The Impedance Boundary Value Problem for the Helmholtz Equation in a Half-Plane (1997)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 20 (1997), S. 813-840 
    Details
    ISSN: 0170-4214
    Keywords: Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: We prove unique existence of solution for the impedance (or third) boundary value problem for the Helmholtz equation in a half-plane with arbitrary L∞ boundary data. This problem is of interest as a model of outdoor sound propagation over inhomogeneous flat terrain and as a model of rough surface scattering. To formulate the problem and prove uniqueness of solution we introduce a novel radiation condition, a generalization of that used in plane wave scattering by one-dimensional diffraction gratings. To prove existence of solution and a limiting absorption principle we first reformulate the problem as an equivalent second kind boundary integral equation to which we apply a form of Fredholm alternative, utilizing recent results on the solvability of integral equations on the real line in [5]. © 1997 B. G. Teubner Stuttgart-John Wiley & Sons Ltd.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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