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  • 1
    Electronic Resource
    Electronic Resource
    Ovipositional response of threeHeliothis species (Lepidoptera: Noctuidae) to allelochemicals from cultivated and wild host plants (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 1817-1827 
    Details
    ISSN: 1573-1561
    Keywords: Cotton ; groundcherry ; tobacco ; Gossypium ; Desmodium ; Physalis ; plant-insect interaction ; host-plant resistance ; Heliothis spp. ; Lepidoptera ; Noctuidae ; oviposition stimulant ; oviposition deterrent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The role of plant allelochemicals on the oviposition behavior ofHeliothis virescens (F.),H. subflexa (Guenee), andH. zea (Boddie) was investigated in the laboratory using a “choice” bioassay system. Fresh young leaves of tobacco,Desmodium tortuosum (Swartz) de Candolle, groundcherry (Physalis angulata L.), and cotton (Gossypium hirsutum L.) squares (flower buds) were washed in methylene chloride or methanol, concentrated to 1 g equivalent of washed material, and applied to a cloth oviposition substrate. Each of the extracts—including groundcherry, a nonhost—stimulated oviposition byH. virescens. H. subflexa were stimulated to oviposit by groundcherry extract, its normal host, and extract from cotton squares, a nonhost. None of the extracts stimulated oviposition byH. zea, although all except groundcherry were from reported hosts. The sensitivity of the bioassay was confirmed by givingH. virescens andH. subflexa an opportunity to choose between extracts that showed stimulant qualities when tested independently versus only solvent-treated controls. In these tests, tobacco showed the highest level of stimulant activity forH. virescens; groundcherry exhibited the highest level of stimulation forH. subflexa.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01020496
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  • 2
    Electronic Resource
    Electronic Resource
    Preferences of matedHeliothis virescens andH. subflexa females for host and nonhost volatiles in a flight tunnel (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 2889-2898 
    Details
    ISSN: 1573-1561
    Keywords: Cotton ; tobacco ; groundcherry ; Physalis ; Desmodium ; Heliothis subflexa ; Heliothis virescens ; Lepidoptera ; Noctuidae ; plant-insect interaction ; host-plant resistance ; attractant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract In flight-tunnel bioassays, mated femaleHeliothis subflexa (Gn.) moths demonstrated in dual-choice tests a significant preference for volatiles from an extract of their only known host,Physalis spp. (groundcherry). However,H. virescens (F.), a polyphagous species, responded positively by anemotaxis to extracts from susceptible tobacco, cotton,Desmodium tortuosum (host plants), and groundcherry, a nonhost.H. virescens females did not fly to volatiles emanating from an extract of a resistant tobacco cultivar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00979481
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  • 3
    Electronic Resource
    Electronic Resource
    A simple terminator for high efficiency liquid chromatography columnsMention of a commercial or proprietary product in this does not constitute endorsement of that product by the USDA. (1978)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 1 (1978), S. 317-319 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC, instrumental details ; Column terminator ; Efficient intermediate preparative liquid chromatography ; Packing of angular silica 5μ and 2-10μ ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A comparison is made between a flat bottom column terminator and a cone terminator on. 1.27 cm O.D. and 2.54 cm O.D. columns. The cone terminator results in a doubling of the column efficiency, is simple and inexpensive, and is universally adaptable to any diameter column.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240010615
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  • 4
    Electronic Resource
    Electronic Resource
    Potential for the separation of insect pheromones by gas chromatography on columns coated with cholesteryl cinnamate, a liquid-crystal phase (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 712-714 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Cholesteric liquid crystal phase ; Separation of geometrical isomers ; Cholesteryl cinnamate ; Insect pheromones ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240021203
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  • 5
    Electronic Resource
    Electronic Resource
    Derivatives of cholesterol cinnamate: A comparison of the separations of geometrical isomers when used as gas chromatographic stationary phasesMention of a commercial or proprietary product does not constitute an endorsement by the USDA. (1983)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 6 (1983), S. 16-19 
    Details
    ISSN: 0935-6304
    Keywords: Capillary gas chromatography ; Liquid crystal stationary phases ; para-Substituted cholesterol cinnamate ; Geometrical isomers (insect pheromones) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Four para-substituted cholesterol cinnamates were synthesized and evaluated for utility as gas chromatograph (GC) liquid crystal stationary phases. The capability of the phases to separate olefinic geometrical isomers was found to be dependent on the position of the olefinic bond. When unsaturation occurred at positions four carbons or greater from the terminal methyl of the compounds investigated, the relative ability of the phases to separate geometrical isomers was p-Cl 〉 p-Me 〉 cholesterol cinnamate 〉 p-MeO derivative 〉 p-NO2. When unsaturation occurred at positions four carbons or less from the terminal methyl the relative ability of the para-derivatives of cholesterol cinnamate to separate geometrical isomers was reversed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240060104
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of film thickness and supercooling on the performance of cholesteryl cinnamate liquid crystal capillary columnsMention of a commercial or proprietary product in this paper does not constitute an endorsement of that product by the USDA. (1981)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 4 (1981), S. 328-332 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Cholesteric liquid crystal phase ; Film thickness and temperature study ; Separation of geometrical isomers ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Improved separations of the isomers of olefinic aliphatic insect pheromones were obtained on cholesteryl cinnamate glass capillary columns by operating in the supercooled temperature range of the liquid crystal. Capillary columns were prepared with varying film thickness of the stationary phase; choice of the correct film thickness ensured optimum retention for a wide range of compounds within the most effective temperature range of the liquid crystal. The deactivation procedures described made the liquid crystal columns suitable for separation of the geometric isomers of polar and nonpolar compounds.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240040704
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of flame treatment on propylene-ethylene copolymer surfaces (1992)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 19 (1992), S. 151-156 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The effects of flame treatment on the surfaces of a propylene-ethylene copolymer have been studied using XPS, contact angle measurement, vapour-phase derivatization and an adhesion test. The results obtained were compared to those from the homopolymer. An optimum air-to-gas ratios of ∼11:1 has been found. Close correspondence between water contact angle and oxygen concentration was found, with the exception of high oxygen concentrations. The orientation or migration of functional groups away from the surface has been proposed to cause the non-correspondence between water contact angle and oxygen concentration. Diiodomethane advancing contact angle was found to remain constant, independent of flame conditions. XPS analysis in conjunction with vapourphase derivatization with trifluroacetic anhydride (TFAA) suggests that up to 20% and 30% of the oxygen introduced in the surfaces is present as hydroxyl groups for propylene homopolymer and the copolymer, respectively. High adhesion levels of the flame-treated copolymer with a polyurethane-based paint were found. In most cases, the adhesion failure was complex, but involved the cohesive failure of the copolymer.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740190129
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