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  • Mol% G+C  (2)
  • global convergence  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Gram-positive bacterial flora on the root surface of wheat (Triticum aestivum L.) grown under different soil conditions (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 121-125 
    Details
    ISSN: 1432-0789
    Keywords: Key words Wheat ; Rhizosphere ; Soil Microflora ; Gram-positive Bacteria ; Coryneform Bacteria ; Arthrobacter spp. ; Mol% G+C ; Diaminopimelic acid ; DAP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract We identified 108 Gram-positive bacterial strains isolated from the root surface of wheat grown under different soil conditions. The strains were divided into four groups based on morphological and physiological characteristics, but most appeared to be coryneform. The taxonomic position of the various groups was verified by the guanine+cytosine DNA contents of the strains. In general, the ranges of these values agreed with those described for the respective taxonomic positions in the literature, with a few exceptions. With soil improvement the distribution of the various groups on the root surface changed, with the coryneform group becoming dominant. This group was further divided into five subgroups, according to cell wall components, cellulose-decomposition, and morphological characteristics, and were identified to genus level. The distribution of these subgroups on the root surface of wheat did not alter with soil improvement. The genus Arthrobacter, the dominant subgroup, predominated in every plot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336051
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Gram-positive bacterial flora on the root surface of wheat (Triticum aestivum L.) grown under different soil conditions (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 121-125 
    Details
    ISSN: 1432-0789
    Keywords: Wheat ; Rhizosphere ; Soil Microflora ; Gram-positive Bacteria ; Coryneform Bacteria ; Arthrobacter spp. ; Mol% G+C ; Diaminopimelic acid ; DAP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract We identified 108 Gram-positive bacterial strains isolated from the root surface of wheat grown under different soil conditions. The strains were divided into four groups based on morphological and physiological characteristics, but most appeared to be coryneform. The taxonomic position of the various groups was verified by the guanine+cytosine DNA contents of the strains. In general, the ranges of these values agreed with those described for the respective taxonomic positions in the literature, with a few exceptions. With soil improvement the distribution of the various groups on the root surface changed, with the coryneform group becoming dominant. This group was further divided into five subgroups, according to cell wall components, cellulose-decomposition, and morphological characteristics, and were identified to genus level. The distribution of these subgroups on the root surface of wheat did not alter with soil improvement. The genus Arthrobacter, the dominant subgroup, predominated in every plot.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336051
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Globally and superlinearly convergent trust-region algorithm for convex SC1-minimization problems and its application to stochastic programs (1996)
    Springer
    Journal of optimization theory and applications 90 (1996), S. 649-669 
    Details
    ISSN: 1573-2878
    Keywords: Trust-region algorithms ; global convergence ; superlinear convergence ; stochastic quadratic programs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract A function mapping from ℛn toℛ is called an SC1-function if it is differentiable and its derivative is semismooth. A convex SC1-minimization problem is a convex minimization problem with an SC1-objective function and linear constraints. Applications of such minimization problems include stochastic quadratic programming and minimax problems. In this paper, we present a globally and superlinearly convergent trust-region algorithm for solving such a problem. Numerical examples are given on the application of this algorithm to stochastic quadratic programs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02189800
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Some Convergence Properties of Descent Methods (1997)
    Springer
    Journal of optimization theory and applications 95 (1997), S. 177-188 
    Details
    ISSN: 1573-2878
    Keywords: Unconstrained differentiable minimization ; descent methods ; global convergence ; rate of convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we discuss the convergence properties of a class of descent algorithms for minimizing a continuously differentiable function f on R n without assuming that the sequence { x k } of iterates is bounded. Under mild conditions, we prove that the limit infimum of $$\left\| { \nabla f(x_k )} \right\|$$ is zero and that false convergence does not occur when f is convex. Furthermore, we discuss the convergence rate of { $$\left\| { x_k } \right\|$$ } and { f(x k )} when { x k } is unbounded and { f(x k )} is bounded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022691513687
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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