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  • 2005-2009
  • 1990-1994  (7)
  • 1925-1929
  • Polymer and Materials Science  (5)
  • Anthomyiidae  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Onion fly egg distribution in soil: a new sampling method and the effect of two granular insecticides (1992)
    Springer
    Entomologia experimentalis et applicata 63 (1992), S. 283-289 
    Details
    ISSN: 1570-7458
    Keywords: Onion fly ; Delia antiqua ; Anthomyiidae ; egg distribution ; soil sampling ; agar infusion ; insecticide ; Lorsban™ 15 G ; chlorpyrifos ; Dyfonate™ 15 G ; fonofos ; ovipositional behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A method for rapidly determining the vertical and horizontal distribution of insect eggs in fragile soil is described. Liquefied agar is allowed to permeate intact soil samples from below; after cooling, the resulting solid is cut into thin sections, from which eggs can be recovered by washes with hot water. This technique revealed that in organic (muck) soil in the laboratory, undisturbed onion flies, Delia antiqua (Meigen) (Diptera: Anthomyiidae), laid 95% of their eggs within a 10 mm diameter zone around the base of a surrogate onion ‘stem’ arising vertically from the soil. Ninety % of all eggs were found in the top 12 mm of soil, with an apparent maximum at depth of 2–4 mm. Increasing fly density from 30 to 200 flies per 30×30×42 cm cage flattened the horizontal distribution of eggs and extended the ovipositional range from c. 15 mm to beyond 60 mm, suggesting there was competition for the preferred ovipositional sites. Surface treatment of muck soil in the field by granular formulations of the insecticides Lorsban™ 15 G (active ingredient chlorpyrifos) and Dyfonate™ 15 G (fonofos) three weeks prior to bioassaying reduced egg-laying at depths greater than 8 mm. The relation between the measured egg distribution and mortality factors in soil (low moisture and high temperature) is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192777
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative analysis of ovipositional behavior: Effects of a host-plant chemical on the onion fly (Diptera: Anthomyiidae) (1991)
    Springer
    Journal of insect behavior 4 (1991), S. 773-792 
    Details
    ISSN: 1572-8889
    Keywords: Delia antiqua ; Anthomyiidae ; Diptera ; herbivore ; egg-laying ; host-finding ; sensory systems ; chemoreception ; n-dipropyl disulfide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Behavioral responses of female onion flies, Delia antiqua (Meigen), to hostplant cues were quantified during encounters of individual flies with onion plants and onion foliar surrogates. The behavioral repertoire of such females included sitting, grooming, running up and down foliar surfaces, extension of the proboscis such that the labellum contacted foliar and soil surfaces, movements of the tip of the abdomen over surfaces (surface probing), subsurface probing of soil crevices with the ovipositor, and oviposition. Sequences of behaviors preceding oviposition were probabilistic rather than highly stereotyped but generally followed the order given above. Foliar surrogates were used to determine the effects of n-dipropyl disulfide (Pr2S2) on the sequence of behaviors leading up to oviposition. The addition of a Pr2S2-treated surrogate to a cage increased the frequency of alighting on that surrogate but also increased alighting on a nearby foliar surrogate without Pr2S2. After alighting, females encountering surrogates treated with Pr2S2 had shorter latencies to proboscis extension and surface probing, spent less time sitting and grooming, and had runs of shorter duration. These females were also more likely to make the transition from probing of surfaces of foliage and soil to subsurface probing of soil crevices and oviposition. Thus, rather than mediating a particular step in the behavioral sequence, Pr2S2 played a role throughout the sequence leading up to oviposition. Collectively, these data and past studies on the onion fly support the hypothesis that egglaying is triggered by a temporal summation of inputs to the central nervous system from various sensory modalities rather than strict behavioral chaining, with each transition effected by some unique cue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01052231
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  • 3
    Electronic Resource
    Electronic Resource
    129Xe NMR as a probe of polymer blends (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 30 (1992), S. 527-532 
    Details
    ISSN: 0887-6266
    Keywords: nuclear magnetic resonance (NMR) with 129Xe as probe of polymer blends ; blends, 129Xe as NMR Probe of ; rubbery polymer blends, 129Xe as NMR probe of ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The miscibility of two-component polymer blends has been investigated using xenon-129 (129Xe) nuclear magnetic resonance (NMR) to probe the phase morphology. The chemical shift of 129Xe dissolved in a given polymer is unique, thus heterogeneous blends with large domain sizes exhibit two 129Xe NMR lines. When a single resonance is obtained, the data are consistent with miscibility, yielding an upper bound on the domain size. The temperature dependence of the relative solubilities and chemical shifts of 129Xe dissolved in the pure components may allow a determination of the phase morphology in blends exhibiting a single resonance. The method is used to demonstrate that polychloroprene and 25% epoxidized 1,4-polyisoprene form a miscible blend.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1992.090300602
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  • 4
    Electronic Resource
    Electronic Resource
    Fundamental modeling in anionic polymerization processes (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 2395-2417 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The anionic solution polymerization of butadiene was studied employing both batch and continuous reactor operations with n-butyllithium (n-BuLi) initiator, tetramethylethylenediamine (TMEDA) modifier, and hexane solvent. A model was proposed that described the kinetics as a function of both the fully modified and unmodified regressed rate data. Using the proposed kinetic model, the conversion, vinyl structure, and heterogeneity index of polymers produced for a series of continuous runs were successfully predicted. The model was used to simulate several process configurations.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070391115
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  • 5
    Electronic Resource
    Electronic Resource
    The reaction engineering of the anionic polymerization of isoprene (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 47 (1993), S. 1589-1599 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The anionic solution polymerization of isoprene with n-butyllithium (n-BuLi) initiator and tetramethylethylenediame (TMEDA) modifier or n-butyllithium (n-BuLi)initiator and tripiperidinophosphine (TPPO) modifier was studied and kinetic and reactor models are proposed for both systems. Reactor conversion, molecular weight distribution, and polymer glass transition temperature had been calculated from the model and compared favorably to actual data for various combinations of reactor system and operating conditions. Simulations of the models can be used to design reactor systems, and predict polymer properties of a large-scale operation from results of small-scale batch reactor runs. © 1993 John Wiley & Sons, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070470907
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  • 6
    Electronic Resource
    Electronic Resource
    Modelling studies of the controlled anionic copolymerization of butadiene and styreneDedicated to Professor Maurice Morton to commemorate the establishment of the Maurice Morton Institute of Polymer Science at the University of Akron. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 33 (1994), S. 151-159 
    Details
    ISSN: 0959-8103
    Keywords: anionic copolymerization ; modelling studies ; styrene ; butadiene ; polymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The anionic polymerization of isoprene with n-butyl lithium and polar modifier such as TMEDA and tripiperdinophosphine oxide were studied and kinetic and reactor models are proposed for these systems. Reactor conversion, molecular weight distribution and polymer glass transition temperature had been calculated from the model and compared favorably to the actual data for various combinations of reactor systems and operating conditions. Simulations of the model can be used to design reactor systems and predict polymer properties of large-scale operations from results of small scale batch reactor runs.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210330205
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  • 7
    Electronic Resource
    Electronic Resource
    Development of seawater-resistant polyurethane elastomers for use as sonar encapsulants (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 42 (1991), S. 911-923 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyurethane systems based on aliphatic diisocyanates were evaluated for suitability for use as underwater transducer encapsulants. A preliminary evaluation was performed to select the most promising urethane systems for further development. An investigation was then undertaken to determine the effect of compositional changes on the properties of these urethanes. The compositional parameters investigated were the soft-segment molecular weight, the prepolymer isocyanate content, the composition of the cure formulation, and the cure stoichiometry. These urethanes were subjected to long-term aging in seawater. It was found that this exposure did not significantly effect the physical or dynamic mechanical properties of the urethane.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1991.070420405
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