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  • Polymer and Materials Science  (9)
  • Colchicum autumnale  (2)
  • Eye morphogenesis  (2)
  • Submillimeter wave  (2)
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Material
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Formation of alkaloids in suspension-cultured Colchicum autumnale
    Amsterdam : Elsevier
    Phytochemistry 27 (1988), S. 1371-1374 
    Details
    ISSN: 0031-9422
    Keywords: Colchicum autumnale ; Liliaceae ; colchicine alkaloids. ; growth substances ; nutritional factors ; plant tissue culture
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(88)80196-1
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Colchicine precursors and the formation of alkaloids in suspension-cultured Colchicum autumnale
    Amsterdam : Elsevier
    Phytochemistry 27 (1988), S. 1375-1378 
    Details
    ISSN: 0031-9422
    Keywords: Colchicum autumnale ; Liliaceae ; colchicine biosynthesis ; demecolcine. ; p-coumaric acid ; phenylalanine ammonia-lyase ; plant tissue culture ; trans-cinnamic acid 4-hydroxylase ; tyramine ; tyrosine decarboxylase
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(88)80197-3
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An eye imaginal disc-specific transcriptional enhancer in the long terminal repeat of the tom retrotransposon is responsible for eye morphology mutations of Drosophila ananassae (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 161-166 
    Details
    ISSN: 1617-4623
    Keywords: Key words Drosophila ananassae ; Om mutations ; tom element ; Retrotransposon ; Eye morphogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Optic morphology (Om) mutations of Drosophila ananassae are semidominant, neomorphic and nonpleiotropic, map to at least 22 loci scattered throughout the genome, and are associated with the insertion of the tom retrotransposon. Molecular and genetic analyses have revealed that eye morphology defects of Om mutants are caused by the ectopic or excessive expression of Om genes in the eye imaginal discs of third instar larvae. It is therefore assumed that the tom element carries tissue-specific gene regulatory sequences which enhance expression of the Om genes. In the present study, we examined whether or not the long terminal repeats (LTR) of the tom element contain such an eye imaginal disc-specific enhancer, using D. melanogaster transformants containing a lacZ gene ligated to the tom LTR. Analyses of lacZ gene expression in the eye imaginal discs of third instar larvae of 18 independently established transformant lines showed that the tom LTR was capable of enhancing lacZ expression in all the transformant lines, but the degree of enhancement varied between lines. In addition, the effect of the tom LTR lacZ gene evidently changed when the tom LTR construct was relocated to different chromosomal positions. On the basis of these findings, it is hypothesized that ectopic and excessive expression of the Om genes in the eye imaginal discs is induced by an eye imaginal disc-specific enhancer present in the tom LTR, the effect of which may be subject to chromosomal position effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172914
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    An eye imaginal disc-specific transcriptional enhancer in the long terminal repeat of thetom retrotransposon is responsible for eye morphology mutations ofDrosophila ananassae (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 161-166 
    Details
    ISSN: 1617-4623
    Keywords: Drosophila ananassae ; Om mutations ; tom element ; Retrotransposon ; Eye morphogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Optic morphology (Om) mutations ofDrosophila ananassae are semidominant, neomorphic and nonpleiotropic, map to at least 22 loci scattered throughout the genome, and are associated with the insertion of thetom retrotransposon. Molecular and genetic analyses have revealed that eye morphology defects ofOm mutants are caused by the ectopic or excessive expression ofOm genes in the eye imaginal discs of third instar larvae. It is therefore assumed that thetom element carries tissue-specific gene regulatory sequences which enhance expression of theOm genes. In the present study, we examined whether or not the long terminal repeats (LTR) of thetom element contain such an eye imaginal disc-specific enhancer, usingD. melanogaster transformants containing alacZ gene ligated to thetom LTR. Analyses oflacZ gene expression in the eye imaginal discs of third instar larvae of 18 independently established transformant lines showed that thetom LTR was capable of enhancinglacZ expression in all the transformant lines, but the degree of enhancement varied between lines. In addition, the effect of thetom LTRlacZ gene evidently changed when thetom LTR construct was relocated to different chromosomal positions. On the basis of these findings, it is hypothesized that ectopic and excessive expression of theOm genes in the eye imaginal discs is induced by an eye imaginal disc-specific enhancer present in thetom LTR, the effect of which may be subject to chromosomal position effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172914
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Study of Electron Beam Misalignment in a Submillimeter Wave Gyrotron (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 1303-1316 
    Details
    ISSN: 1572-9559
    Keywords: Gyrotron ; Misalignment ; Electron beam ; Submillimeter wave
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron beam misalignment in a submillimeter-wave gyrotron strongly affects its total efficiency as well as excitation of rotating and counterrotating modes. Some of misalignment phenomena were studied theoretically and experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022611520012
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    High Frequency and High Mode Purity Operations of Gyrotron FU IVA (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 919-930 
    Details
    ISSN: 1572-9559
    Keywords: Gyrotron ; Submillimeter wave ; High mode purity operation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The cavity of the newest gyrotron, Gyrotron FU IVA in the high frequency series of Fukui University gyrotrons (the Gyrotron FU series) is designed to minimize the mode conversion from the main cavity mode to the higher modes. In this paper, the experimental results are compared with simulations for the complete gyrotron oscillator. The gyrotron has an additional advantage to cover the wide frequency range in submillimeter wave region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022619207020
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  • 7
    Electronic Resource
    Electronic Resource
    A study of surface dynamics of polymers. III. Surface dynamic stabilization by plasma polymerization (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 2061-2074 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: As demonstrated in Part II of this series of studies, the hydrophobic character of CF4 plasma-treated Nylon 6 and poly(ethylene terephthalate) (PET) decay with time of water immersion, and the rate of decay can be used as a measure for the surface mobility of (substrate) polymers. The same method of using fluorine-containing moieties introduced by CF4 plasma treatment as surface labeling is applied to investigate the influence of a thin layer of plasma polymer of methane applied onto the surface of those polymers. An ultrathin layer of plasma polymer provides a barrier to the rotational and diffusional migration of the introduced chemical moieties from the surface into the bulk of the film. The influence of operational parameters of plasma polymerization on the surface dynamic stability are examined by measuring the decay rate constants for (subsequently) CF4 plasma-treated samples. The rate constant was found to decrease sharply with increasing value of plasma energy input manifested by J/kg monomer, and no decay was observed as the energy input reached a threshold value (about 6.5 GJ/kg for PET, about 7.0 GJ/kg for Nylon 6), indicating that unperturbable surfaces can be created by means of plasma polymerization.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090261004
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  • 8
    Electronic Resource
    Electronic Resource
    A study of surface dynamics of polymers. II. Investigation by plasma surface implantation of fluorine-containing moieties (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1781-1794 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Macromolecules at the surface of a polymeric solid have considerable mobility, and the specific arrangement of functional groups of macromolecules at the surface is dictated by the environmental conditions in which the surface is placed. Consequently, the change of environmental conditions, such as immersion in water or placement in a biological surrounding, could cause a cosiderable degree of change in the surface characteristics of a polymer from those evaluated in the laboratory against ambient air. The mobile nature of a polymer surface can be investigated by surface-implanting fluorine-containing moieties, mainly - CF3, by the plasma implantation technique and following the disappearance and reappearance of fluorine atoms on the surface. The disappearance rates (based on the immersion time in water at room temperature) of ESCA F1s signals, the decay rates of (advancing) contact angle of water, and the recovery of these values on heat treatment of water-immersed samples were measured as a function of crystallinity of polymer samples (at three levels of crystallinity) for poly(ethylene terephthalate) and nylon 6.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260817
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  • 9
    Electronic Resource
    Electronic Resource
    Development of a new advanced process for manufacturing polyacetal resins. Part III. End-capping during polymerization for manufacturing acetal homopolymer and copolymer (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 50 (1993), S. 1317-1329 
    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: Conventionally, acetal homopolymer or copolymer is obtained by the polymerization of formaldehyde or trioxane, following the end-capping using acetic anhydride or unzipping of the unstable polymer end fraction. First, Asahi Chemical developed a new process to obtain an end-capped polymer during polymerization of highly purified formaldehyde using acetic anhydride as the chain-transfer agent. Use of highly purified formaldehyde and endcapping during polymerization using acetic anhydride as a chain-transfer agent or an endcapping agent will provide a simple process for manufacturing acetal homopolymer. The polymerization mechanism was confirmed by infrared spectroscopy analysis and proton NMR analysis of the polymer obtained. Second, for the acetal copolymer, purified trioxane was copolymerized with ethylene oxide in the presence of methylal, which gave an endcapped polymer with high thermal stability. Two new intermediates from the initiation reaction of the copolymerization, 1,3,5,7-tetraoxacyclononane (TOCN) and 1,3,5,7,10-pentaoxacyclododecane (POCD), were isolated and a new initiation mechanism was proposed. © 1993 John Wiley & Sons, Inc.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070500803
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of the addition of a liquid crystalline copolyester to polystyrenes on blending torque and mechanical properties of blends (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 383-391 
    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: Blending of polystyrenes (PS) with a thermotropic liquid crystalline polymer (LCP) was performed by using a continuous corotating twin screw extruder. The influence of LCP content on the blending process was studied by changing the barrel heater temperature and the screw speed. The torque of screw shafts, generated during the blending process, was influenced by LCP content and its influence was not simple. The torque generated during the blending process was not directly related to the apparent melt viscosity of blends. Further, the effects of the matrix viscosity on the morphology and mechanical properties of the PS/LCP blends were studied using three grades of PS as matrix resins. It was found that the size of the LCP dispersed phase decreased with increasing matrix viscosity. Consequently, the mechanical properties of the PS/LCP blend were improved. © 1993 John Wiley & Sons, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070480302
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