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  • Polymer and Materials Science  (5)
  • Aleurone  (1)
  • 33BAPB
  • Engineering
  • 1990-1994
  • 1985-1989  (6)
  • 1955-1959
  • 1989  (6)
Collection
Keywords
Publisher
Years
  • 1990-1994
  • 1985-1989  (6)
  • 1955-1959
Year
  • 1
    Electronic Resource
    Electronic Resource
    Gibberellic-acid-stimulated Ca2+ accumulation in endoplasmic reticulum of barley aleurone: Ca2+ transport and steady-state levels (1989)
    Springer
    Planta 178 (1989), S. 411-420 
    Details
    ISSN: 1432-2048
    Keywords: Aleurone ; Calcium transport ; Endoplasmic reticulum (Ca2+ levels) ; Gibberellin and Ca2+ transport ; Golgi apparatus ; Hordeum (Ca2+ transport) ; Microsome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The steady-state levels of Ca2+ within the endoplasmic reticulum (ER) and the transport of 45Ca2+ into isolated ER of barley (Hordeum vulgare L. cv. Himalaya) aleurone layers were studied. The Ca2+-sensitive dye indo-1. Endoplasmic reticulum was isolated and purified from indo-1-loaded protoplasts, and the Ca2+ level in the ER was measured using the Ca2+-sensitive dye indo-1. Endoplasmic reticulum was isolated and purified from indo-1-loaded protoplasts, and the Ca2+ level in the lumen of the ER was determined by the fluorescence-ratio method to be at least 3 μM. Transport of 45Ca2+ into the ER was studied in microsomal fractions isolated from aleurone layers incubated in the presence and absence of gibberellic acid (GA3) and Ca2+. Isopycinic sucrose density gradient centrifugation of microsomal fractions isolated from aleurone layers or protoplasts separates ER from tonoplast and plasma membranes but not from the Golgi apparatus. Transport of 45Ca2+ occurs primarily in the microsomal fraction enriched in ER and Golgi. Using monensin and heat-shock treatments to discriminate between uptake into the ER and Golgi, we established that 45Ca2+ transport was into the ER. The sensitivity of 45Ca2+ transport to inhibitors and the Km of 45Ca2+ uptake for ATP and Ca2+ transport in the microsomal fraction of barley aleurone cells. The rate of 45Ca2+ transport is stimulated several-fold by treatment with GA3. This effect of GA3 is mediated principally by an effect on the activity of the Ca2+ transporter rather than on the amount of ER.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391870
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and some properties of carbazole modified polyvinylchloride and the cation exchange resin therefrom (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 170 (1989), S. 115-125 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Substitution von Chlor in PVC durch 3,6-Diamino-N-methyl-carbazol entsteht ein Kondensat, das in allen Lösungsmitteln für PVC unlöslich ist. Dieses Kondensat ist thermisch stabiler als PVC. Auch die dielektrischen Eigenschaften unterscheiden sich deutlich von denen von PVC. Die Sulfonierung des PVC-Carbazol-Kondensats liefert ein Kationenaustauscherharz mit SO3H- und COOH-Gruppen.
    Notes: The chlorine displacement reaction between PVC and N-methylcarbazole-3,6-diamine affords a condensate which is insoluble in all possible solvents of PVC. The overall thermal stability of this condensate is appreciably higher than that of PVC. The dielectric behavior is also significantly different from that of unmodified PVC. Sulfonation of the PVC-carbazole condensate affords a cation-exchange resin with —SO3H and —COOH functional moieties.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051700108
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  • 3
    Electronic Resource
    Electronic Resource
    Composite model calculation for the thermal expansibility of high density polyethylene (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 173 (1989), S. 111-118 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die thermische Ausdehnung von Polyethylen hoher Dichte wurde mit dem Composit-Modell berechnet, das schon mit Erfolg zur Beschreibung der mechanischen Eigenschaften und der Wärmeleitfähigkeit verwendet wurde. Die Wechsel der Orientierungen der Baueinheiten, aus denen die Masse des Polymeren aufgebaut ist, wurden aus einer empirischen Beziehung mit zwei Parametern abgeleitet, welche die Autoren vorschlugen. Eine vergleichende Untersuchung über die Variation der Orientierungsparameter mit den Verarbeitungsbedingungen wurde ebenfalls durchgeführt.
    Notes: The thermal expansibility of high density polyethylene is calculated within the framework of the composite model which has already been found useful in describing its mechanical properties and thermal conductivity. The orientational changes of the units of which the bulk of the polymer is supposed to be composed has been derived from a two parameter empirical relation proposed by the authors. A comparative study of the variation of the orientational parameters with processing conditions has also been included.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051730109
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and some properties of PVC-bound dimethylglyoxime complexes of Co(II), Ni(II), and Cu(II) (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1243-1252 
    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: Poly(vinyl chloride) (PVC) has been reacted with dimethylglyoxime (DMG) in THF to form the PVC-DMG comples, which has been characterized by spectroscopic and elemental analyses. The latter indicate that there is one DMG moiety anchored on the PVC chain by displacing every 12th Cl atom in the chain. PVC-DMG has further been reacted with alcoholic solutions of Co(II), Ni(II), and Cu(II) to form the intensely colored PVC-DMG-M(II) complexes. The structures of these complexes have been analyzed by elemental and IR spectral analyses. The overall thermal stability of PVC-DMG-M(II) increases in the order: PVC 〈 PVC-DMG-Cu(II) 〈 PVC-DMG-Ni(II) 〈 PVC-DMG-Co(II). The electrical conductivities are also significantly enhanced in the same order. The permittivities of these complexes are high relative to PVC at low frequency falling gradually with increasing frequency and the dielectric loss-frequency behavior is very broad.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380705
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis and some properties of anthracene and anthraquinone incorporated poly(vinyl chloride) and the ion exchange resin therefrom (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 1641-1651 
    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: Poly(vinyl chloride) has been modified by chlorine displacement reaction with 2-anthrol and anthraquinone-2-ol. The condensates (PVC-ACOL and PVC-AQOL) are insoluble in all solvents common to PVC and have been characterized by elemental and IR spectra analysis. The initial decomposition temperature of these condensates follow the trend: PVC-AQOL (250°C) 〉 PVC-ACOL (200°C) 〉 PVC(190°C) and the overall thermal stabilities beyond 60% decomposition follows the same trend. Permittivity and dielectric loss of these condensates sharply fall with increasing applied frequency (10-1.3 ×107 Hz) to a limiting constant value. In contrast, for unmodified PVC these values are low and remain independent of frequency in the same range. Sulfonation of these PVC condensates affords a weak acid resin with —COOH and —OH ionogenic groups, but no strong sulfonic acid groups due presumably to oxidative degradation of the PVC matrix.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380905
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal stability characteristics of some resins from chemically modified PVC (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 1855-1861 
    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: PVC has been modified by chlorine displacement reaction with m-aminophenol, bisphenol A, and phenophthalein. Sulfonation of these condensates yields bifunctional weak acid resins which do not exhibit —SO3H ionogenic group. Reaction of PVC with presulfonated bisphenol A, phenolphthalein, and phenol yields strong acid resins. Thermal stability characteristics of these various resins have been determined and the results indicate that such modifications improve the overall thermal stability of PVC.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370709
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