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  • 1
    Electronic Resource
    Electronic Resource
    Repellent, toxic, and food protectant effects of pithraj,Aphanamixis polystachya extracts against pulse beetle,Callosobruchus chinensis in storage (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 899-908 
    Details
    ISSN: 1573-1561
    Keywords: Aphanamixis polystachya ; pithraj ; repellent ; contact toxicity ; food protectant ; Callosobruchus chinensis ; Coleoptera ; Bruchidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Ground leaves, bark, seeds, and four seed extracts of pithraj,Aphanamixis polystachya (family Meliaceae), a locally grown plant in Bangladesh, were evaluated for their repellency, contact toxicity, and food protectant efficacy against adult pulse beetle (Callosobruchus chinensis L.). The seed extracts showed poor repellent effects, but high contact toxicity to adults at 72 hr after application. The ground leaves, bark, and seeds provided good protection for mung beans against pulse beetles, and the seed powder greatly reduced the F1 progeny and seed damage rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059586
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  • 2
    Electronic Resource
    Electronic Resource
    Deterrent and insecticidal effects of extracts of pithraj,Aphanamixis polystachya (Meliaceae), againstTribolium castaneum in storage (1993)
    Springer
    Journal of chemical ecology 19 (1993), S. 2463-2471 
    Details
    ISSN: 1573-1561
    Keywords: Pithraj ; Aphanamixis polystachya ; Meliaceae ; repellent ; feeding deterrent ; Tribolium castaneum ; red flour beetle ; Coleoptera ; Tenebrionidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Laboratory experiments were carried out to investigate the efficacy of seed extracts of pithraj,Aphanamixis polystachya (Wall & Parker), a locally grown plant in Bangladesh, against the red flour beetle,Tribolium castaneum (Herbst.). Results of three different bioassays showed that crude extracts of pithraj seeds have strong repellent effects and moderate feeding deterrent and insecticidal (direct-contact) effects on adultTribolium castaneum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00980683
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of charge on bond strength in hydrogenated amorphous silicon (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 15 (1994), S. 644-652 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: We have studied the effect of excess charge on the bond strength in the silanes SiH4 and Si2H6 to assess whether charge trapping in a solid-state lattice might promote the technologically important photodegradation of amorphous silicon alloys (the Staebler-Wronski effect). The calculations indicate that both positive and negative charges reduce the strength of Si—H and Si—Si bonds considerably, to the point where they may be broken easily by visible or even infrared light. © 1994 by John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540150608
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  • 4
    Electronic Resource
    Electronic Resource
    Simulation of the electronic and vibrational structure of hydrogenated amorphous silicon using cluster models (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 14 (1993), S. 1423-1428 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: A set of simple models of hydrogenated amorphous silicon (a-Si:H) consisting of hypothetical silane molecules with diamond or similar lattices was studied by the semiempirical AM1 method. Densities of states and infrared spectra were calculated for the silane molecules and similar molecules with dangling bonds disorder, and with boron or phosphorus substitution to simulate doping. Some examples are presented, and a comparison is made with experimental properties of a-Si:H. It is proposed to use these models in a study of the Staebler-Wronski photodegradation of a-Si:H and other aspects of amorphous silicon technology. © John Wiley & Sons, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540141203
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