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  • Chemistry  (1)
  • Cucurbita  (1)
  • Epoxy  (1)
  • Gene expression  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Polymer blends of PA6 and PPE compatibilized by phenolic novolac epoxy coupler (1997)
    Springer
    Journal of polymer research 4 (1997), S. 91-99 
    Details
    ISSN: 1572-8935
    Schlagwort(e): Polymer blend ; PA6 ; PPE ; Epoxy ; Reactive compatibilizer ; Coupling agent
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Abstract A commercially available multi-functional epoxy monomer, phenolic novolac epoxy (PNE) resin, has demonstrated to be an effective reactive compatibilizer for the blends of polyamide-6 (PA6) and poly(2,6-dimethyl-1,4-phenylene ether) (PPE). It requires about 1/10 by weight relative to a typical conventional reactive compatibilizer to achieve same level of compatibilization in terms of mechanical property improvements. By acting as a coupler, this multi-functional epoxy can react with PA6 and PPE during melt blending and produces the desirable PA6-co-PNE-co-PPE mixed copolymers at the interface. This in situ-formed copolymer containing PA6 and PPE segments tends to reside at the interface between PA6 and PPE domains to reduce melt interfacial tension and enhance interface adhesion as an efficient compatibilizer of the PA6/PPE blends.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s10965-006-0012-4
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Transcriptional regulation of hydroxypyruvate reductase gene expression by cytokinin in etiolated pumpkin cotyledons (1996)
    Springer
    Planta 198 (1996), S. 1-5 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Cucurbita ; Cytokinin ; Gene expression ; Hydroxypyruvate reductase ; Transcription
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract To understand the mechanisms by which the expression of a specific gene is modulated by cytokinin, the regulation of hydroxypyruvate reductase (HPR) transcript levels by N6-benzyladenine (BA) in etiolated pumpkin (Cucurbita pepo L. cv. Halloween) cotyledons was investigated. A pumpkin HPR cDNA was generated by reverse transcriptase-polymerase chain reaction and its nucleotide sequence was determined. An antisense HPR RNA was prepared for RNase protection analysis of HPR-mRNA expression patterns in the cotyledons of dark-grown pumpkin seedlings. Treatment of the cotyledons with BA was shown to modulate HPR mRNA levels in a dose- and time-dependent manner. Similarly, nuclear run-on studies showed that the rate of transcription was also enhanced by BA treatment of the cotyledons. These results suggest that the enhancement of HPR mRNA by cytokinin is, at least in part, at the level of transcription.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00197579
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Studies on polyurethane protective surface material resistance to cavitation erosionThe following three Institutions take part in our research work: Sichuan Centre Institute of Electric Power, Sichun Institute of Water Conservancy Science, and Dong Fang Motorltenator Plant. (1982)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 22 (1982), S. 752-759 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The polyurethane protective surface material, which were made from four different types of polyester and polyether polyol, have been studied with respect to their ultimate properties. The PTMG (polyoxytetramethylene glycol)- and PPG (polyoxypropylene giyco)-based polyurethane protective surface materials exhibited the best results. Use of JIPNs (joint interpenetrating polymer networks), prepared from combinations of polyurethnes with an epoxy adduct with coupling agents and talc, could clearly improve the adhesive strength resistance to water in negative pressure cavitation erosion (by determination with a rotating dish apparatus) and the adhesive strength resistance toward boiling water. The polyurethane protective surface material, which was composed of three separated layers, showed better resistance to cavitation erosion than an epoxy system, poly(methyl methacrylate), aluminum, steel, and different alloys in tests using the venturi tube and the rotating dish apparatus for simulated cavitation erosion, as well as in some power stations in actual field trials.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760221205
    Standort Signatur Erwartet Verfügbarkeit
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