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  • 1
    Electronic Resource
    Electronic Resource
    Infection of Legumes by Rhizobia (1981)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology 32 (1981), S. 407-449 
    Details
    ISSN: 0066-4294
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pp.32.060181.002203
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  • 2
    Electronic Resource
    Electronic Resource
    Optimization strategies for hydro energy storage plants (1984)
    Springer
    Mathematical methods of operations research 28 (1984), S. B103 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract This paper is concerned with the optimization of base load production of hydro energy storage plants within a given time interval at a varying tariff rate. For three real world storage plants in Austria, each of them presenting some characteristic difficulty we discuss both mathematical models and numerical techniques. Beside classical techniques as Dynamic Programming and Simulation two newly developed nonlinear optimization methods were used. The first combines the Homotopy method with the active index set strategy, the second technique is based on decomposition and is strongly directed to the special structure of the problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922145
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Nodulation of soybean byRhizobium japonicum mutants with altered capsule synthesis (1982)
    Springer
    Planta 154 (1982), S. 100-109 
    Details
    ISSN: 1432-2048
    Keywords: Mutant (Rhizobium) ; Nodulation ; Capsule (bacterial) ; Lectin ; Polysaccharide ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Spontaneous mutants with altered capsule synthesis were isolated from a marked strain of the symbiont,Rhizobium japonicum. Differential centrifugation was used to enrich serially for mutants incapable of forming capsules. The desired mutants were detected by altered colony morphology and altered ability to bind host plant lectin. Three mutants failed to form detectable capsules at any growth phase when cultured in vitro or in association with the host (soybean,Glycine max (L.) Merr.) roots. These mutants were all capable of nodulating and attaching to soybean roots, indicating that the presence of a capsule physically surrounding the bacterium is not required for attachment or for infection and nodulation. Nodulation by several of the mutants was linearly proportional to the amount of acidic exopolysaccharide that they released into the culture medium during the exponential growth phase, indicating that such polysaccharide synthesis is important and perhaps required for nodulation. Two of the mutants appeared to synthesize normal lectin-binding capsules when cultured in association with host roots, but not when cultured in vitro. Nodulation by these mutants appeared to depend on how rapidly after inoculation they synthesized capsular polysaccharide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387901
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Muonic atoms testing the electron propagator of quantum electrodynamics and the Higgs boson contribution (1983)
    Springer
    Foundations of physics 13 (1983), S. 115-132 
    Details
    ISSN: 1572-9516
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this work we consider the energy states of muonic atoms which are predominantly influenced by vacuum polarization. This fact is used for testing the electron propagator of QED with the modification $$S(p) = (\not p - me)^{ - 1} + f(\not p - M)^{ - 1}$$ . The data of some well analyzed transitions in muonic He, Si, Ba, and Pb yield the limit M〉29 MeV for f=1. Similarly the presence of a Higgs boson would cause a shift of the energy levels which can be measured easier in muonic atoms since the coupling grows with the fermion mass. The analysis of several transitions in heavy muonic atoms shows, that the mass of the Higgs boson is larger than 12.8 MeV. Further reductions of the present-day uncertainties concerning the experimental data and especially of the nuclear structure effects could improve these limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01889415
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Höhensteuerung eines Tagesspeicherkraftwerks (1982)
    Springer
    Mathematical methods of operations research 26 (1982), S. B145 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Summary A given influx during a certain time interval, say a day, is to be transformed into energy in an optimal way. In other words the production of energy per day is to be maximized. We discuss a small hydro energy storage plant (one day's reservoir capacity) where the capacity of the influx tunnel depends on the actual head of the reservoir. First we analyse the system with the help of a simplified model with both linear tunnel capacity and linear reservoir volume function and piecewise constant influx. Then reality is modelled with piecewise linear approximation and the system is solved numerically.
    Notes: Zusammenfassung Der während eines bestimmten Zeitraumes, etwa einem Tag, anliegende Zufluß soll optimal in Energie umgesetzt werden, m.a.W. die Energieausbeute pro Tag soll maximiert werden. Es wird ein Tagesspeicherkraftwerk betrachtet, bei dem die Kapazität des Zuflußstollens von der jeweiligen Speicherhöhe abhängt. Das grundsätzliche Verhalten des Systems wird zunächst an einem Modell mit linearen Kennlinien und an Hand von idealisierten Zuflußsituationen studiert. Anschließend wird ein Modell, worin reale Kennlinien und Zuflußsituationen stückweise linear approximiert werden, formuliert und numerisch gelöst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01917137
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  • 6
    Electronic Resource
    Electronic Resource
    Spot inoculation of soybean roots withRhizobium japonicum (1983)
    Springer
    Protoplasma 115 (1983), S. 122-128 
    Details
    ISSN: 1615-6102
    Keywords: Inoculation ; Nodulation ; Rhizobium japonicum ; Soybean ; Symbiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A method has been developed to inoculate soybean roots in the zone of susceptible root cells with nanoliter droplets containing the symbiont,Rhizobium japonicum. The position of inoculation is marked by means of ion exchange beads which adhere to the root surface. InoculatedR. japonicum cells from a nanoliter droplet spread over an area of approximately 35 host epidermal cells and have a high probability (∼ 80%) of inducing nodule formation at exactly the point of inoculation. The spot inoculation method is highly efficient in terms of the number of bacteria required to achieve a given probability of nodule formation. The method greatly facilitates ultrastructural analysis of the infection process and is useful for certain physiological studies of infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279804
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