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  • 1985-1989  (2)
  • Life and Medical Sciences  (1)
  • Polymer and Materials Science  (1)
  • Organic Chemistry
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  • 1
    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 polymeranaloge Reaktion von Polyvinylalkohol mit Carbonsäurechloriden wurde eine Serie von lichtvernetzenden Photopolymeren mit demselben Polymerrückgrat, aber mit verschiedenen seitenständigen Chromophoren hergestellt: den vier Imidylderivaten Dimethylmaleinimid, 4-Methyl-3,4,5,6-tetrahydrophthälsaureimid, 3,4,5,6-Tetrahydrophthalsäureimid und 3,4-Dihydro-1,2-naphthalindicarbonsäureimid, sowie trans-3-Phenyl-propensäure (Zimtsäure) und 1,3-Diphenyl-2-propenon (Chalkon). Die Photoempfindlichkeit der mit Thioxanthon sensibilisierten Polymeren wurde nach der Gelpunktmethode und mittels der photographischen Stufenkeilmethode bestimmt. Für unsensibilisierte Filme des Chalkon- sowie des 3,4-Dihydro-1,2-naphthalindicarbonsäureimidylpolymeren konnte der Zusammenhang zwischen Belichtung und Umsetzung an photovernetzbaren Gruppen quantitativ ermittelt werden. Bei monochromatischer Belichtung bei 365 nm waren sensibilisierte und unsensibilisierte Imidylpolymere eine Größenordnung empfindlicher als die Polymeren mit Chalkon- und Zimtsäuregruppen.
    Notes: A series of photopolymers with the same polymer backbone but with different pendent chromophors including four imidyl structural units  -  dimethylmaleimide, 4-methyl-3,4,5,6-tetrahydrophthalic acid imide, 3,4,5,6-tetrahydrophthalic acid imide, and 3,4-dihydro-1,2-naphthalene dicarboxylic acid imide  -  as well as trans-3-phenyl propenoyl (cinnamoyl) and 1,3-diphenyl-2-propenonyl (chalcone) units were synthesized by polymer analogous reaction of the corresponding carboxylic acid chloride derivatives with poly(vinyl alcohol). The polymers, sensitized with thioxanthone, were characterized by their minimal exposure energies derived from gel point as well as photographic sensitivity measurements. Quantitative relations between chromophore conversion and exposure were established for unsensitized films of the chalcone and the 3,4-dihydro-1,2-naphthalene dicarboxylic acid imidyl polymer. Upon irradiation with monochromatic 365 nm light the sensitized and unsensitized imidyl polymers proved to be one order of magnitude more sensitive than the chalcone and cinnamoyl polymers.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 131 (1987), S. 29-35 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The compensatory growth of the kidney which is induced by unilateral ne-phrectomy is a highly regulated process resulting principally in hypertrophy of the remaining kidney. The events which regulate this process are unknown. We have examined the levels of transcripts for the proto-oncogenes, myc, H-ras, K-ras, and fos, and the cellular genes, H4 histone, ornithine aminotrans-ferase, and gamma-glutamyl transpeptidase, following unilateral nephrec-tomy in the rat. The pattern of expression of c-myc, c-H-ras, and c-K-ras during compensatory growth of the kidney differs from the pattern of expression of these proto-oncogenes during liver regeneration, in which, unlike the kidney, hyperplasia rather than hypertrophy predominates. The lack of change in the abundance of these proto-oncogene transcripts following unilateral nephrec-tomy suggests a primary relationship between the expression of these proto-oncogenes and DNA synthesis and indicates there may be separate signals for cell growth, one to double cell size and one to replicate DNA. Increased mRNA transcripts for the enzymes ornithine aminotransferase and gamma-glutamyl transpeptidase were induced in the contralateral kidney after ne-phrectomy. The time course of expression for these two enzymes differs. The early expression of the gamma-glutamyl transpeptidase gene may indicate an involvement of this glutathione-metabolizing enzyme during renal compensatory growth, while the function of the delayed increase in ornithine amino-transferase transcripts in the remaining kidney is not apparent.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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