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  • 1
    Electronic Resource
    Electronic Resource
    Some Electrical Differences between Healthy and Virus-infected Potato Tubers (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 973-974 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the following investigations, healthy and virus-infected tubers of the same degree of maturity were used. Unless otherwise stated, the tubers were grown at the Dickson Experiment Station, A.C.T. Two short metal pins1 at the end of a glass tube were inserted into a tuber, in most cases at the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169973a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The relation between nitrogen percent and dry weight of inoculated legumes (1980)
    Springer
    Plant and soil 57 (1980), S. 353-362 
    Details
    ISSN: 1573-5036
    Keywords: Dry matter ; Nitrogen percent ; Nitrogen translocation ; Rhizobium effectiveness prediction ; Temperate legumes ; Tropical legumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Results of numerous tests of tropical and temperate legume hosts and Rhizobium strains accumulated between 1952 and 1966 were examined for a relation between N percent (y) and dry weight per plant (x). The data fitted the equation y=A−be−cx. The most effective Rhizobium strains can be selected on the basis of dry matter yields of whole plants or plant tops only, without the need for N analyses, using statistical analyses. A previously proposed method which employs the linear relation between N-yield and dry matter yield was shown to apply only when data for strains which are not fully effective are excluded. It is postulated that symbiotically fixed N forms a different compound from that resulting from applied mineral N and that this compound cannot be remobilised before flowering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02211692
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Acid production byRhizobium a unifying concept (1965)
    Springer
    Plant and soil 22 (1965), S. 143-166 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A study was made of the acid-producing characteristics of 717 strains of Rhizobium in relation to the taxonomic position of the host legume. The hypothesis advanced is that the slow-growing non acid-producing type of Rhizobium commonly associated with tropical legumes represents the ancient form of the symbiont which has persisted unchanged because acid production during growth in the rhizosphere in acid soils would react unfavourably against survival. When the host legume becomes adapted to non-acid soils this restriction is lifted from the Rhizobium. The faster growth rate that is possible with an acid-producing metabolism and the competitive advantage this confers in the rhizosphere then ensures that the Rhizobium strains in effective symbiosis with the host become acid producers. If a group of legumes is found to be characteristically associated with Rhizobium that is strongly acid-producing it is an indication that the host group is an advanced one that has become strongly adapted to non-acid soils. The significance of this hypothesis to agronomic practice and to the taxonomy of legumes and of Rhizobium is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01373988
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A rank-one algorithm for unconstrained function minimization (1977)
    Springer
    Journal of optimization theory and applications 21 (1977), S. 261-275 
    Details
    ISSN: 1573-2878
    Keywords: Unconstrained function minimization ; rank-one algorithm ; descent algorithm ; quadratic form
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A rank-one algorithm is presented for unconstrained function minimization. The algorithm is a modified version of Davidon's variance algorithm and incorporates a limited line search. It is shown that the algorithm is a descent algorithm; for quadratic forms, it exhibits finite convergence, in certain cases. Numerical studies indicate that it is considerably superior to both the Davidon-Fletcher-Powell algorithm and the conjugate-gradient algorithm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00933530
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    Paper (German National Licenses)
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