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  • 1995-1999  (3)
  • 1965-1969  (1)
  • Chemistry  (2)
  • Cardiomyopathy  (1)
  • Chemoattractant  (1)
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural changes and immunohistochemical localization of advanced glycation end products in the heart of streptozotocin-treated Mongolian gerbils (1999)
    Springer
    Medical electron microscopy 32 (1999), S. 43-49 
    Details
    ISSN: 1437-773X
    Keywords: Key words Advanced glycation end products (AGEs) ; Mongolian gerbil ; Coronary artery ; Cardiomyopathy ; Streptozotocin (STZ)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study was designed to clarify the developing mechanism of cardiomyopathy and vasculopathy in streptozotocin-treated Mongolian gerbils. Twenty male Mongolian gerbils (MG; 10–12 weeks old) were used, and 150 mg/kg of streptozotocin (STZ) was injected into the left femoral vein. Six control male MG were injected intravenously with normal saline. The animals showed severe hyperglycemia (up to 330 ± 96.4 mg/dl) by 1 week after streptozotocin administration. At 1 week after STZ treatment, cardiomyocytes revealed no significant change, but unclear striated structures were demonstrated in cardiomyocytes at 4 weeks. After 1 year, anisocytosis was observed, and in the perinuclear region granular components were stained positively with periodic acid-Schiff reagent. Ultrastructurally, at 4 weeks and 1 year after STZ treatment, cardiomyocytes were irregular in size, and oval amorphous and lysosomal electron-dense bodies were observed in perinuclear and cytoplasmic regions. In coronary arteries, endothelial and medial cells revealed increased vesicles and intercellular collagen fibrils. Capillaries showed slight swelling of endothelial cells associated with the lamellar thickening of basement membrane and collagen fibrils in the perivascular regions. Immunohistochemically, advanced glycation end products (AGE) were observed in the cytoplasm of vascular and heart cells, and ultrastructurally the reaction products were demonstrated in the endoplasmic reticulum and lysosomes of cardiomyocytes and vascular cells in the STZ-treated Mongolian gerbils. AGE may play an important role not only in angiopathy but also in cardiomyopathy of STZ-treated Mongolian gerbils after STZ treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007950050007
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A newly identified chemotactic sexual pheromone from Closterium ehrenbergii (1998)
    Springer
    Sexual plant reproduction 11 (1998), S. 81-85 
    Details
    ISSN: 1432-2145
    Keywords: Key words Closterium ehrenbergii ; Chemoattractant ; Conjugation ; Sexual pheromone ; Protoplast-release-inducing protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  In sexual reproduction of Closterium ehrenbergii, pairing with the sexual partner cells is the first process observed. A cell migration-inducing activity, specific for mating-type plus (mt+; NIES-228) cells, was detected in the culture medium of mating-type minus (mt–; NIES-229) cells. Light was necessary for production of the active substance by mt– cells and for migration of mt+ cells. The active substance was heat-labile and had an apparent molecular mass of 20 kDa, as determined by gel filtration. A protein of 20 kDa was detected in the active fraction of gel filtration after sodium dodecyl sulfate polyacrylamide gel electrophoresis. Based on these results, it is proposed that a chemotactic sexual pheromone involved in the formation of sexual pairs of cells is secreted by mt– cells of C. ehrenbergii and is proteinaceous, like other sexual pheromones secreted by Closterium species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050123
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Compatibility and tensile behavior of polypropylene/ethylene-propylene rubber blends (1995)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 35 (1995), S. 1261-1271 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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: This study clarifies and quantifies factors which increase the ductility of a low-molecular-weight propylene homopolymer having an intrinsic viscosity of 0.89 dl/g. The tensile behavior of homopolymer/ethylene-propylene rubber (EPR) blends was studied from the viewpoint of the associated molecular structure of EPR and its compatibility with the homopolymer. When EPR is “dissolved” in a homopolymer, the glass transition temperature (Tg) of the amorphous phase of a homopolymer was found to shift to a lower temperature, with homopolymer/EPR compatibility being subsequently evaluated using this shift, i.e., Δtg. Results show two conditions are required to improve the ductility of the low-molecular weight propylene homopolymer: ΔTg must be ≥ 3°C and ≥ 30 wt% EPR must be blended with the homopolymer.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760351602
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The initiation mechanism of polymerization by the system AlEt3/H2O (1966)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 98 (1966), S. 58-65 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Reaktion von H2O mit Al-triäthyl (Al(C2H5)3) und der Initiierungsmechanismus der Polymerisation wurden durch Anwendung von tritiiertem H2O untersucht. Beträchtliche Tritium-Anteile aus tritiiertem H2O verblieben im System Al(C2H5)3/H2O bei Zimmertemperatur. Wärmebehandlung des Systems bewirkte eine starke Abnahme des Tritium-Gehalts und einen Verlust der Katalysatoraktivität. Mit dem System Al(C2H5)3/H2O hergestellte Polymere erwiesen sich als radioaktiv. Auf Grund der Ergebnisse wurde angenommen, daß im System Al(C2H5)3/H2O acider Wasserstoff vorhanden und für die Initiierung einer kationischen Polymerisation verantwortlich ist.
    Notes: The reaction between H2O and triethylaluminum Al(Et3) as well as the initiation mechanism of the polymerization by the system AlEt3/H2O have been examined by means of tritiated water, Considerable amount of tritium from tritiated water remained in the system AlEt3/H2O prepared at room temperature. Heat treatment of the system causes both the extensive decrease of tritium content and loss of catalyst activity. Polymers of styrene and isobutyl vinyl ether prepared by the system AlEt3/H2O were found to be radioactive. These findings have been taken to assume that acid hydrogen does exist in the system AlEt3/H2O and is directly responsible for the initiation of cationic polymerization.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1966.020980107
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    Paper (German National Licenses)
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