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  • 1
    Electronic Resource
    Electronic Resource
    Relationships between xanthoxin, phototropism, and elongation growth in the sunflower seedling Helianthus annuus L. (1981)
    Springer
    Planta 151 (1981), S. 365-370 
    Details
    ISSN: 1432-2048
    Keywords: Auxin (indole-3-acetic acid) ; Elongation growth ; Helianthus ; Hormones ; Phototropism ; Xanthoxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract For phototropic curvature of a green sunflower seedling, only the hypocotyl has to be illuminated; the tip and cotyledons are not involved in stimulus perception. The etiolated seedling is phototropically insensitive, illumination of only the hypocotyl renders it sensitive. It is concluded that the photoreceptor is located within the responding organ. In curving seedlings, the endogenous indoleacetic acid (IAA) remains evenly distributed. However, the inhibitor, xanthoxin (Xa), accumulates on the illuminated side. The degree of phototropic response is generally related to the concentration of Xa. The amount of phototropic curvature is independent of the rate of elongation growth, the former can be changed without affecting the latter, and vice versa. The data conflict with the Cholodny-Went theory, whereas they support the hypothesis of Blaauw that the phototropic reaction is caused by the local accumulation of a growth-inhibiting substance on the irradiated side.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393292
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The role of the apex in the phototropic curvature of Avena coleoptiles: positive curvature under conditions of continuous illumination (1982)
    Springer
    Planta 155 (1982), S. 281-286 
    Details
    ISSN: 1432-2048
    Keywords: Avena (phototropism) ; Apex (coleoptile) ; Phototropism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The differential growth causing second positive phototropic curvature in intact, black-capped and decapitated Avena coleoptiles has been measured. In all cases the curvature is brought about by a cessation in growth of the illuminated side. The fact that shading the apex does not significantly alter the initial steps of differential growth means that the subapical zones can perceive and respond to unilateral illumination. Decapitation significantly reduces coleoptile growth, especially in the most apical zone. However, the fact that differential growth is still evident in the other zones of decapitated coleoptiles within 30 min of unilateral illumination requires one to conclude that the apex cannot be controlling the differential growth in those basal zones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429452
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Numerical procedure for calculation of temperature evolution in composite elements with internal cavities (1994)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 10 (1994), S. 437-451 
    Details
    ISSN: 1069-8299
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: In the paper a computation code based on the finite-element method for temperature evolutions in composite elements with internal cavities is presented. It is suitable for the analysis of various thermal problems encountered in mechanical and civil engineering such as fire risk assessment. It is based on a plane isoparametric triangular element with six nodes allowing the modelling of curved boundaries. In order to analyse composite steel-concrete elements and to take into account the non-linearities coming from the temperature-dependent material properties and from the boundary conditions, an implicit integration scheme is used. Another advantage of the program is the possibility of describing internal cavities with convection and radiation exchanges. In order to show the capacity of the program two examples are presented. Comparisons have been made with experimental and other numerical results, exhibiting very good agreement.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cnm.1640100603
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    Paper (German National Licenses)
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