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  • Engineering  (3)
  • Helianthus annuus  (3)
  • Springer  (3)
  • Wiley-Blackwell  (3)
  • American Geophysical Union (AGU)
  • Hindawi
  • 1
    Electronic Resource
    Electronic Resource
    Colocation of downy mildew (Plasmopara halstedii) resistance genes in sunflower (Helianthus annuus L.) (1996)
    Springer
    Euphytica 91 (1996), S. 225-228 
    Details
    ISSN: 1573-5060
    Keywords: bulked segregant analysis ; Helianthus annuus ; linkage ; Plasmopara halstedii ; resistance genes ; RFLP ; sunflower ; downy mildew
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The Pl6 locus in the inbred sunflower (Helianthus annuus L.) line HA335 giving resistance to French races of downy mildew (Plasmopara halstedii (Farl.) Berl. & de Toni. was localized by molecular techniques. A bulked segregant analysis was made on the F2 progeny from a cross between this line and H52, a downy mildew susceptible line. The resistance gene in HA335 was found to have the same linked RFLP marker loci as those determined for Pl1 (resistance to race 1 in the line RHA266) on linkage group 1 of the consensus RFLP map of the cultivated sunflower. Pl1 and Pl6 thus appear either to be allelic or closely linked. The implications for sunflower breeding are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021074
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  • 2
    Electronic Resource
    Electronic Resource
    Large displacement analysis of three-dimensional beam structures (1979)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 961-986 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: An updated Lagrangian and a total Lagrangian formulation of a three-dimensional beam element are presented for large displacement and large rotation analysis. It is shown that the two formulations yield identical element stiffness matrices and nodal point force vectors, and that the updated Lagragian formulation is computationally more effective. This formulation has been implemented and the resulted of some sample analyses are given.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620140703
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  • 3
    Electronic Resource
    Electronic Resource
    Accumulation of Defense Related Transcripts in Sunflower Hypocotyls (Helianthus annuus L.) Infected with Plasmopara halstedii (1999)
    Springer
    European journal of plant pathology 105 (1999), S. 333-340 
    Details
    ISSN: 1573-8469
    Keywords: chitinase ; defense gene ; Helianthus annuus ; PAL ; Plasmopara halstedii ; ubiquitin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A cDNA clone encoding a sunflower chitinase was obtained using degenerated primers in PCR amplifications and RACE procedures. This clone, a phenylalanine ammonia-lyase (PAL) clone and ubiquitin clone were used to analyse the resistance of sunflower (Helianthus annuus) to downy mildew. The differential regulation of amounts of PAL (involved in the general pathway of phenylpropanoid synthesis), chitinase (a pathogenesis-related protein) and ubiquitin (involved in proteolytic pathways) mRNA was studied in hypocotyls during the early stages after an aerial infection of sunflower inbred line RHA274 with zoospores from either race 1 (incompatible, host resistant) or race B (compatible, host susceptible) of Plasmopara halstedii. Northern analyses showed that transcript levels of PAL, chitinase and ubiquitin were rapidly and strongly increased after infection in incompatible interactions but not in the compatible ones, suggesting that regulation of these mRNAs is an important component of the resistance mechanisms in sunflower.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008770008117
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  • 4
    Electronic Resource
    Electronic Resource
    Microscopical studies of the effect of metalaxyl on the interaction between sunflower,Helianthus annuus L. and downy mildew,Plasmopara halstedii (1995)
    Springer
    European journal of plant pathology 101 (1995), S. 399-404 
    Details
    ISSN: 1573-8469
    Keywords: Helianthus annuus ; hypersensitivity ; metalaxyl ; Plasmopara halstedii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The mode of action of the fungicide metalaxyl againstPlasmopara halstedii, the causal agent of sunflower downy mildew, was studied following its application before, during and after artificial contamination of seedlings. The development of the fungus within the treated seedlings was examined microscopically and compared to that occuring in untreated genetically susceptible or resistant genotypes. Hypersensitive-like reactions and necrotic zones leading to the inhibition of fungus growth within the hypocotyl were observed for the three modes of application. This suggests that sunflower defence mechanisms activated by genetical resistance are also involved in the control of downy mildew by metalaxyl.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01874853
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  • 5
    Electronic Resource
    Electronic Resource
    A virtual surface concept for nested yield surface plasticity (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 16 (1992), S. 779-796 
    Details
    ISSN: 0363-9061
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: A return mapping algorithm based on the concept of virtual surfaces is presented for stress integration in the numerical solution of boundary value problems using an elastoplastic multiple yield surface model. Both kinematic hardening and isotropic softening yield surfaces are addressed. With the implementation of virtual surfaces, the active yield surface is located before a stress update is implemented. The return mapping algorithm consists of only two steps. The first step consists of performing the intermediate update of the trial stress corresponding to the translation of all yield surfaces inside the active yield surface. Little calculation is involved in this step. The second step consists of performing the conventional explicit one-step radial return mapping of the updated trial stress on the corresponding active yield surface. The algorithm efficiency resides in the virtual surface based return mapping which preserves the elastic predictor representation of the updated trial stress, and limits iterations to at most two steps.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nag.1610161102
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  • 6
    Electronic Resource
    Electronic Resource
    A C1 triangular interpolant suitable for scattered data interpolation (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Communications in Applied Numerical Methods 7 (1991), S. 479-485 
    Details
    ISSN: 0748-8025
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: We present here a method of constructing a triangle interpolant which interpolates position and partial derivatives specified at the three vertices of the triangle. The method employs the cubic Bézier triangular patch technique. The data given enable us to determine the appropriate Bézier control points so that adjacent patches meet with C1 continuity. However, the interior control point for the patch is replaced by three separate points, due to the implementation of three local schemes, each of which satisfies the boundary conditions on only one side of the triangle. Convex combination is used to blend these three local schemes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1630070608
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