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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 40 (1975), S. 0 
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 166-168 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The specimens chosen were human Achilles tendons which were stored in Ringer solution in a domestic refrigerator. This tendon consists of collagen fibres, largely parallel to the long axis of the tendon, which typically was 5 cm long and 8 mm in diameter. Because of this structure there is a large ...
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  • 3
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 491-492 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In previous experiments5 we established that, although dry collagen is strongly piezoelectric, belonging to the oo (T) point group, fully hydrated tendon collagen is not piezoelectric because of the structured water it contains. The electrical signals generated when fully wet collagen was stressed ...
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 67 (1963), S. 1838-1840 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 604-613 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The deposition of hydrogenated amorphous silicon by biased activated evaporation is described. The films are characterized by measurements of hydrogen content, conductivity and photoconductivity against temperature for intrinsic, n-type and p-type films, optical absorption, field-effect mobility and density of states, space-charge limited currents, and spin density. Silicon nitride and silicon carbide films are also described. It is concluded that the process offers high-rate deposition of films whose quality is comparable with glow-discharge films but with better thermal stability and no illumination-induced conductivity changes.
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  • 6
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 730-730 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Introduction to Applied Solid State Physics: Topics in the Applications of Semiconductors, Superconductors, and the Nonlinear Optical Properties of Solids., By R. Dalven. Pp.330. (Plenum: 1980.) 27.50, 17.33. THE philosophy of this book is that solid-state physics teaching, in physics courses, ...
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  • 7
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SYNTHESIS of gastrin was, in our view, essential both to confirm the sequence deduced from degradative investigations1 and to remove the possibility that a small constituent, not giving a colour with ninhydrin, had escaped our notice. In the event, synthesis of gastrin I2 gave the clue to the ...
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  • 8
    ISSN: 1570-7458
    Keywords: azadirachtin ; azadirachtin analogues ; Spodoptera littoralis ; antifeedant ; behaviour ; electrophysiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The antifeedant activity of azadirachtin and 56 azadirachtin analogues, including 22,23-dihydroazalirachtin, against larvae ofSpodoptera littoralis was investigated using behavioural and electrophysiological bioassays. None of the analogues was as active as azadirachtin, although many showed significant antifeedant activity at high concentrations. The majority of the analogues stimulated a dose-dependent response from a neurone in the medial styloconic maxillary sensilla which correlated with the behavioural activity. Methylation of the hydroxy substitutions on the azadirachtin molecule usually resulted in a decrease in antifeedant activity, as did the addition of bulky groups to the dihydrofuran ring.
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Entomologia experimentalis et applicata 55 (1990), S. 149-160 
    ISSN: 1570-7458
    Keywords: Spodoptera littoralis ; Spodoptera frugiperda ; Heliothis virescens ; Heliothis armigera ; azadirachtin ; salannin ; limonoids ; antifeedants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé L'activité phagodissuadante de l'azadirachtine, de ses dérivés et des limonoïdes voisins sur 4 espèces de lépidoptères: Spodoptera littoralis, S. frugiperda, Heliothis virescens et H. armigera a été évaluée par des expériences avec et sans choix. Les expériences de choix ont montré que le comportement alimentaire de S. littoralis était modifié par plus de substances que celui de S. frugiperda ou H. virescens. Celui de H. armigera était le moins modifié. Les 2 substances les plus puissantes parmi les 40 examinées, ont été l'azadirachtine et le dihydroazadirachtine. Ces résultats montrent que l'hydrogénation de la double liaison C-22,23 ne réduit pas l'activité phagodissuadante et que la nature des substitutions en C-1, C-3 et C-11 sont importantes. Les molécules avec des substitutions volumineuses en C-22 ou C-23 sont généralement des phagodissuadants aussi inefficaces que ceux ayant perdu un époxide. Les substances notées comme phagodissuadants actifs dans les expériences de choix ne sont pas toujours aussi actives en absence de choix. La valeur des tests dans l'évaluation du mode d'action des substances est discuté.
    Notes: Abstract The antifeedant activity of azadirachtin, azadirachtin-derivatives and related limonoids was assessed in choice and no-choice bioassays against four species of Lepidoptera: Spodoptera littoralis, Spodoptera frugiperda, Heliothis virescens and Heliothis armigera. The choice bioassay showed that the feeding behaviour of S. littoralis was affected by more of the compounds than that of either S. frugiperda or H. virescens. H. armigera was the least affected. Azadirachtin and dihydroazadirachtin were the most potent of the 40 compounds tested. The results showed that hydrogenation of the C-22,23 double bond did not decrease antifeedant activity and the nature of the substitutes at C-1, C-3 and C-11 were important. Molecules with bulky substitutes at either C-22 or C-23 were usually ineffective antifeedants as were compounds lacking an epoxide. Compounds recorded as active antifeedants in the choice bioassay were not always as active in the no-choice test. The value of the bioassays in assessing the mode of action of the compounds is discussed.
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  • 10
    ISSN: 1570-7458
    Keywords: Azadirachtin ; Spodoptera littoralis ; Spodoptera frugiperda ; Heliothis virescens ; growth disruption ; oral cannulation ; abdominal injection ; topical application
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Spodoptera littoralis, S. frugiperda et Heliothis virescens ont été exposés à l'azadirachtine et 23 autres substances voisines dans 3 expériences: canulation orale, injection d'haemolymphe et application topique. S. littoralis est sensible à un plus grand nombre de substances que les 2 autres espèces. De toutes façons, les substances les plus actives ont été l'azadirachtine, la 22,23-dihydroazadirachtine et la 1-détigloyl-22,23-dihydroazadirachtine. La nature des substitutions en C-1 et C-3 de l'anneau décaline modifie la puissance des substances, tout comme les substitutions en C-22,23. D'une façon générale, les chenilles ont été moins sensibles aux applications topiques qu'aux canulations dans le tube digestif ou aux injections dans l'haemolymphe.
    Notes: Abstract Spodoptera littoralis, Spodoptera frugiperda and Heliothis virescens were exposed to azadirachtin and 23 other related compounds in three bioassays: oral cannulation, haemolymph injection and topical application. Spodoptera littoralis was susceptible to a larger proportion of the compounds than either of the other species. Overall, azadirachtin, 22,23-dihydroazadirachtin and 1-detigloyl-22,23-dihydroazadirachtin were the most active compounds. The nature of the substitutes at C-1 and C-3 of the decalin ring affects the potency of the compounds, as does the addition of substitutes to C-22,23. Generally, larvae were less sensitive to compounds when they were topically applied than when they were cannulated into the gut or injected into the haemolymph.
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