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  • Coupling agent  (1)
  • DNA-binding proteins  (1)
  • Gene expression  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    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
    Keywords: Polymer blend ; PA6 ; PPE ; Epoxy ; Reactive compatibilizer ; Coupling agent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0012-4
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: Cucurbita ; Cytokinin ; Gene expression ; Hydroxypyruvate reductase ; Transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00197579
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  • 3
    Electronic Resource
    Electronic Resource
    Interaction of DNA-binding proteins with the 5′-flanking region of a cytokinin-responsive cucumber hydroxypyruvate reductase gene (1998)
    Springer
    Plant molecular biology 38 (1998), S. 713-723 
    Details
    ISSN: 1573-5028
    Keywords: cucumber ; cytokinin-responsive ; DNA-binding proteins ; hydroxypyruvate reductase ; transcription
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transcription of the cucumber hpr-A gene is responsive to cytokinin and light. To investigate the molecular basis for transcriptional regulation by cytokinin, we have identified DNA sequences and proteins that may be involved in the regulation of hpr-A gene expression. Transient expression assays in etiolated cucumber cotyledons indicate that the 315 bp fragment (−382 to −67) contains sequences necessary for cytokinin responsiveness of the luciferase reporter gene. Band shift assays detected cytokinin-enhanced and -reduced protein binding sites in a 97 bp fragment (−382 to −285) upstream of the hpr-A gene. DNase I footprinting identified two protein-protected sites, a 15 bp sequence, 5′-AAATGACGAAAATGC-3′, that contains an as-1 TGACG motif found in other plant promoters, and a 13 bp sequence, 5′-AAGATTGATTGAG-3′, of unknown function. Two-dimensional band shift analysis of the cytokinin-responsive DNA protein complex revealed the presence of six DNA protein interactions. Band shift assays showed that cytokinin and light have different effects on the interaction of nuclear proteins to the 97 bp fragment of the hpr-A gene. These data suggest that cytokinin and light do not share identical signal transduction pathways in regulating hpr-A gene expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006034932322
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