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  • Polymer and Materials Science  (62)
  • Inorganic Chemistry  (59)
  • Tortricidae  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of pungenin, a foliar constituent of some spruce species, and investigation of its efficacy as a feeding deterrent for spruce budworm [Choristoneura fumiferana (Clem.)] (1986)
    Springer
    Journal of chemical ecology 12 (1986), S. 251-260 
    Details
    ISSN: 1573-1561
    Keywords: Picea pungens ; Picea glauca ; feeding deterrent ; spruce budworm ; Choristoneura fumiferana (Clem.) ; Lepidoptera ; Tortricidae ; pungenin ; protection of OH groups ; glucoside ; phenolic glucoside
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Pungenin was synthesized from 3,4-dihydroxyacetophenone by a short sequence involving manipulation of protecting groups on the 3 and 4 hydroxyl functions. Bioassays indicated that the glucoside is a modest feeding deterrent for sixth-instar spruce budworm larvae, but it does not appear to retard the development of small larvae or lead to increased mortality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01045608
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  • 2
    Electronic Resource
    Electronic Resource
    Enniatins fromFusarium avenaceum isolated from balsam fir foliage and their toxicity to spruce budworm larvae,Choristoneura fumiferana (Clem.) (Lepidoptera: Tortricidae) (1988)
    Springer
    Journal of chemical ecology 14 (1988), S. 753-764 
    Details
    ISSN: 1573-1561
    Keywords: Enniatins ; cyclodepsipeptides ; Fusarium avenaceum ; Abies balsamea ; balsam fir ; Choristoneura fumiferana ; Lepidoptera ; Tortricidae ; spruce budworm ; insecticide ; toxin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Material extracted from hyphae ofFusarium avenaceum, isolated from foliage of balsam fir,Abies balsamea, was toxic to spruce budworm larvae when incorporated into insect diet. The major insecticidal component of the toxic fraction was identified by chemical and spectroscopic methods as enniatin complex, rich in enniatin A/A1. Possible ecological implications of these observations are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01018770
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  • 3
    Electronic Resource
    Electronic Resource
    Trichothecene mycotoxins produced byFusarium sporotrichioides daom 197255 and their effects on spruce budworm,Choristoneura fumiferana (1990)
    Springer
    Journal of chemical ecology 16 (1990), S. 1605-1609 
    Details
    ISSN: 1573-1561
    Keywords: Trichothecenes ; sesquiterpines ; Fusarium sporotrichioides ; fungal toxins ; insecticidal activity ; fungal pathogen ; Paecilomyces farinosus ; spruce budworm ; Choristoneura fumiferana ; Lepidoptera ; Tortricidae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Trichothecene mycotoxins were produced byFusarium sporotrichioides DAOM 197255 isolated from a spruce budworm cadaver. An extract from the culture filtrate containing these metabolites was toxic to budworm when ingested at concentrations as low as 10 ppm in diet, and survivors were predisposed to infection with a fungal entomopathogen. The possible role of these metabolites in the balsam fir-spruce budworm habitat is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014093
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  • 4
    Electronic Resource
    Electronic Resource
    The curing of epoxy resins with aminophenoxycyclotriphosphazenes (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 2415-2424 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aminophenoxycyclotriphosphazenes have been used as curing agents for epoxy resins. The thermal curing was performed in stages at 120-125 and 175-180°C followed by postcuring at 225°C to give tough brown polymers. The thermal curing reaction was monitored using FTIR and differential scanning calorimetry. Thermogravimetric analysis of the cured resins has shown thermal stability up to 350-340°C. The char yield obtained in nitrogen at 800°C was about 55-42% and in air at 700°C was about 40-32%. Graphite cloth laminates were prepared. The mechanical properties evaluated were found superior to those of commonly used epoxy resin systems. These resins are useful for making fire- and heat-resistant composites, laminates, molded parts, and adhesives.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1986.080241004
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  • 5
    Electronic Resource
    Electronic Resource
    Ammeline-melamine-formaldehyde resins. Preparation and properties (1996)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 34 (1996), S. 2543-2561 
    Details
    ISSN: 0887-624X
    Keywords: ammeline-melamine-formaldehyde resins ; ammeline-formaldehyde resins ; hydroxymethylation ; formaldehyde ; ammeline ; melamine ; methylolation ; water tolerance ; cloud point ; reaction time ; bis-N-hydroxymethylammeline ; A-stage resin ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ammeline-melamine-formaldehyde resins (AMF Resins) containing 5-100 mol % of ammeline, were synthesized by polymerization of the preformed sodium salt of ammeline, melamine, and formaldehyde in basic medium by three methods. These resins, when cured, constitute a new class of thermosets. The rate of hydroxymethylation of the amino groups of the ammeline salt with formaldehyde was somewhat larger then that of the amino groups on melamine. At higher pH values ammeline insolubility was not a problem. The AMF resin composition was approximately equal to the mol ratio of the components originally charged. Both ammeline and melamine were consumed over the entire reaction period. Thus, it is possible to make approximately uniform random ammeline-melamine-formaldehyde resins (AMF) with any mol ratio of ammeline salt to melamine. By controlling the pH of the solution from which the resins were isolated, the (SINGLE BOND) O- Na+/(SINGLE BOND) OH ratio could be varied. Resin melting points varied widely with the mol fraction of ammeline and the (SINGLE BOND) O- Na+/(SINGLE BOND) OH ratio. AMF resin solubilities, shelf lives, cloud points, and water tolerance depended upon the method of preparation, pH, and other factors. The sodium salt of ammeline was hydroxymethylated in water more readily than ammeline. More highly methylolated ammeline species were readily formed in solution but upon precipitation only bis-N-hydroxymethylammeline was isolated. © 1996 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    S-benzoyl O-ethyl xanthate as a new photoinitiator: Photopolymerization and laser flash photolysis studiesContribution No. NDRL-3423 from the Notre Dame Radiation Laboratory and No. RRL-PRU-22 from the Regional Research Laboratory, Trivandrum. (1993)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 31 (1993), S. 653-659 
    Details
    ISSN: 0887-624X
    Keywords: photopolymerization ; photoinitiator ; aroyl xanthates ; methyl methacrylate ; laser flash photolysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new sulfur-containing photoinitiator, S-benzoyl O-ethyl xanthate (2) has been prepared and used for the photopolymerization of methyl methacrylate (MMA). The photoinitiation property of 2 has been examined by conventional polymerization methods and nanosecond laser flash photolysis studies. Upon 308 nm laser pulse excitation, 2 gave rise to transients with absorption maxima at 350 and 650 nm, assigned to the benzoyl radical (3) and (ethoxythiocarbonyl)thiyl radical (4), respectively, on the basis of their quenching by nitroxy radicals and spectral similarity to analogous species, reported in the literature. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1993.080310308
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  • 7
    Electronic Resource
    Electronic Resource
    Deposition, annealing and characterisation of high-dielectric-constant metal oxide films (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 5 (1995), S. 163-175 
    Details
    ISSN: 1057-9257
    Keywords: ULSI ; high dielectric constant ; metal oxides ; deposition ; annealing ; characterisation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Flims of metal oxides, such as Ta2O5, Nb2O5, Al2O3, HfO2, ZrO2 and TiO2 have been fabricated by use of different precursor materials, deposition techniques and annealing techniques. Several analytical methods were applied to study the layers. New data of fundamental properties of these metal oxides are reported and related to practical features that are of importance in device design and manufacturing of advanced, highly integrated devices. This overview may facilitate the choice of an optimal combination of precursor material, deposition technique and corresponding annealing procedure for a specific application of these metal oxide films in microelectronics.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860050305
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  • 8
    Electronic Resource
    Electronic Resource
    Polyimide structure-property relationships. III. Polyimides from multi-ring diamines (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 26 (1981), S. 3805-3817 
    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 effects of increasing the distance between, and varying the isomeric positions of, the amine groups on the glass transition temperatures of aromatic polyimides were studied in order to investigate routes to improve processability. A number of isomers of three- and four-ring benzenoid diamine systems were polymerized with 3,3′,4,4′-benzophenone tetracarboxylic acid dianhydride to poly(amic acids), which were converted to polyimides. The use of methylene and carbonyl groups to connect the benzene rings of the diamines, and in one case the dianhydride, afforded a comparison of the thermomechanical properties of the polyimides to those prepared from diphenylmethane- and benzophenone-diamines, respectively. Generally, the dilution of the imide content by the insertion of benzylene and benzoylene segments into the diamines significantly reduced the glass transition temperatures, with the benzylene group being more effective in that respect than the benzoylene. However, there was evidence that the position isomerism (ortho, meta, para) of the amine groups was more influential in affecting the glass transition temperatures of aromatic polyimides than was the dilution of the imide content.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1981.070261127
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  • 9
    Electronic Resource
    Electronic Resource
    Activation of blood coagulation at heparin-coated surfaces (1997)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 37 (1997), S. 108-113 
    Details
    ISSN: 0021-9304
    Keywords: immobilized heparin ; contact activation ; thrombin generation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: It is hypothesized that immobilized heparin exerts a dual role in blood coagulation. On the one hand, the heparinized surface is because of its dense negative charge, thought to initiate the intrinsic pathway of blood coagulation. On the other hand, heparin is known as a potent anticoagulant drug. However, it remains to be seen how much contact-phase activation of factor XI contributes to thrombin formation and how this process is counterbalanced by which of the anti-protease activities of immobilized heparin. In the present study we examined the generation of factors XIa, IXa, and Xa, and thrombin in recalcified normal and antithrombin-depleted plasma exposed to polyacrylamide-graft polyurethane (PU) sheets modified by multipoint attachment of two different heparin species. One of them, HAH, contained the specific antithrombin binding sequence and the other one, NAH, had a low affinity for antithrombin and had no anticoagulant activity. Our data demonstrate that in contrast to PU, PU-NAH and PU-HAH are strong mediators of factor XIa and factor IXa formation in normal and antithrombin-deficient plasma. Interestingly, compared to PU-HAH and PU-NAH, thrombin formation was only slightly diminished in antithrombin-deficient plasma exposed to PU. In contrast, thrombin formation was dramatically delayed and diminished in normal plasma exposed to PU-HAH. These findings indicate that very low amounts of factor XIa apparently suffice to induce significant amounts of thrombin. In this sense, heparinized surfaces are highly thrombogenic, but our data also indicate that this activity is effectively counterbalanced by the anti-thrombin activity of the immobilized anti-coagulant species of heparin. © 1997 John Wiley & Sons, Inc. J Biomed Mater Res, 37, 108-113, 1997.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Die Pyridinaddukte der Goldhalogenide. 3. Darstellung, Eigenschaften und Kristallstruktur zweier Modifikationen von AuBr · NC5H5 (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 512 (1984), S. 169-176 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pyridine Adducts of Gold Halides. 3. Preparation, Properties, and Crystal Structure of Two Modifications of AuBr · NC5H5The reaction of AuBr · S(CH2C6H5)2 with pyridine in absolute ethanol yields the crystalline compound AuBr · pyridine. It crystallizes in the triclinic space group P1 with the lattice constants a = 791.5(2) pm, b = 935.6(2) pm, c = 1005.1(3) pm, α = 85.78(2)°, β = 102.07(2)°, γ = 109.31(2)°. When the solvent is toluene, monoclinic crystals are formed with the space group C2/c and a = 1225.9(2) pm, b = 1522.2(3) pm, c = 1459.7(3) pm, β = 97.82(2)°. The triclinic structure is built up by Au4 zig-zag chains AuBr2 - Au(py)2 - Au(py)2 - AuBr2, whereas the monoclinic phase contains infinite chains with the sequence AuBr2 - Au(py)2. In each case the linkage is formed by weak Au - Au-interactions.
    Notes: Bei der Umsetzung von AuBr · S(CH2C6H5)2 mit Pyridin in absolutem Ethanol kristallisiert AuBr · Pyridin in Form trikliner Kristalle mit der Raumgruppe P1 und den Gitterkonstanten a = 791,5(2) pm, b = 935,6(2) pm, c = 1005,1(3) pm, α = 85,78(2)°, β = 102,07(2)°, γ = 109,31(2)°. Wird die Reaktion dagegen in absolutem Toluol durchgeführt, so erhält man eine monokline Modifikation mit der Raumgruppe C2/c und a = 1225,9(2) pm, b = 1522,2(3) pm, c = 1459,7(3) pm, ß = 97,82(2)°. Die Strukturen beider Modifikationen bestehen aus linearen Au(py)2- und AuBr2-Gruppen, die durch schwache Gold-Gold-Wechselwirkungen zu kettenförmigen Komplexen verbunden sind. Die trikline Modifikation bildet diskrete Au4-Zickzack-Ketten AuBr2 - Au(py)2 - Au(py)2 - AuBr2. In der monoklinen Phase sind die Baugruppen in der Abfolge AuBr2 - Au(py)2 zu unendlichen Ketten verknüpft.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845120518
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