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  • 1
    Electronic Resource
    Electronic Resource
    Chemoreception of oviposition inhibiting terpenoids in the diamondback moth Plutella xylostella (1998)
    Springer
    Entomologia experimentalis et applicata 87 (1998), S. 143-155 
    Details
    ISSN: 1570-7458
    Keywords: Plutella xylostella ; oviposition inhibitor ; contact chemoreceptor ; morphology ; electrophysiology ; ablation ; terpenoids ; sensory mechanism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of six terpenoids and two terpenoid containing extracts of the neem tree (Azadirachta indica A. Juss.) on oviposition by the diamondback moth (Plutella xylostella L., Yponomeutidae: Lepidoptera) were tested. Two drimane terpenoids, the sesquiterpenoid polygodial and the neem extract Margosan-O exerted significant inhibitory effects at the dosages tested. Ablation experiments showed that both antennae and fore-tarsi contributed to mediation of the inhibition by a drimane. Location of chemosensilla on prothoracic tarsi and ovipositor was examined by scanning electronmicroscopy. Electrophysiological recordings from ovipositor and tarsal taste sensilla showed that distilled water produced distinct responses from one neuron. In tarsal sensilla, ethanol and drimane solutions produced responses from two neurons, one of which might be the water cell that fired at a reduced rate. A drimane significantly decreased the responses of tarsal chemoreceptors to a cabbage leaf extract, which is a possible sensory mechanism leading to behavioural avoidance of this compound.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003296514369
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  • 2
    Electronic Resource
    Electronic Resource
    Lee's extremum principle and the large deflection response of dynamically loaded plastic structures (1991)
    Springer
    Acta mechanica solida Sinica 4 (1991), S. 369-379 
    Details
    ISSN: 0894-9166
    Keywords: dynamic plastic response ; Lee's extremum principle ; evolutionary mode ; large deflection ; portal frame
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An approximate method based on Lee's extremum principle is introduced to study the large deflections of dynamically loaded plastic structures. As an example, the evolutionary mode of an impulsively loaded rigid-perfectly plastic portal frame is determined and then compared with the experimental results [8] and with the large deflection complete solution obtained previously [9]. It is found that the evolutionary modal solution may approach the complete solution if the modes are appropriately chosen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02207586
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