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  • 1
    Electronic Resource
    Electronic Resource
    Surface modifications of polyaniline films by graft copolymerization (1992)
    s.l. : American Chemical Society
    Macromolecules 25 (1992), S. 1959-1965 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00033a020
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  • 2
    Electronic Resource
    Electronic Resource
    INCREASED CA2+ INFLUX IN THE RESTING STATE MAINTAIN THE MYOGENIC TONE AND ACTIVATES CHARYBDOTOXIN-SENSITIVE K+ CHANNELS IN FEMORAL ARTERIES FROM YOUNG SHR (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 22 (1995), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. To determine the possible role of voltage-dependent Ca2+ channels (VDCC) and Ca2+-activated K+ (KCa) channels in the regulation of resting tone of arteries from young spontaneously hypertensive rats (SHR), mechanical responses to the agents which interact with these channels were examined in endothelium-denuded strips of femoral arteries from 4 week old SHR and age-matched normotensive Wistar-Kyoto (WKY) rats. Systolic blood pressures at this age were not significantly different between SHR and WKY.2. The strips from SHR, but not from WKY, maintained a myogenic tone; that is, the resting tone decreased when nifedipine was added.3. Studies using 1 or 5 min pulse labelling of the strips with 45Ca showed that the basal Ca2+ influx was increased in SHR when compared with WKY, and this increase in SHR was abolished by nifedipine. Similar results were obtained when the cytoplasmic Ca2+ concentration ([Ca2+]i) in the resting state of the strips was measured by fura-PE3.4. The addition of charybdotoxin (ChTX, a blocker of large conductance Kca channels) to the resting state caused a concentration-dependent contraction, which was much greater in SHR than in WKY. The ChTX-induced contraction in SHR was abolished by nifedipine.5. In strips preloaded with 86Rb, the basal 86Rb efflux rate constant was significantly greater in SHR than in WKY. The increase in 86Rb efflux in SHR was abolished by nifedipine.6. The results suggest that the Ca2+ influx via L-type VDCC was increased in the resting state of the femoral artery from 4 week old SHR, and therefore the myogenic tone was maintained and ChTX-sensitive K+ channels were highly activated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1995.tb02892.x
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of 9-methyl-7-bromoeudistomin D (MBED), a Powerful Ca2+ Releaser, on Smooth Muscles of the Guinea Pig (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 707 (1993), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1993.tb38122.x
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  • 4
    Electronic Resource
    Electronic Resource
    Weitere Mitteilung über die Verbreitung der Neurofibrillen in der Netzhaut (1934)
    Springer
    Graefe's archive for clinical and experimental ophthalmology 133 (1934), S. 157-163 
    Details
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Schlußfolgerung Am 14. Bruttage sind die nervösen Spongioblasten bei Hühnern schon gut entwickelt. Sie liegen in der äußeren Zone der inneren plexiformen Schicht, besitzen mehrere sich horizontal ausbreitende Fortsätze und je einen Achsenzylinder. Die erstgenannten bilden in der horizontalen Ebene untereinander ein ausgedehntes Netzwerk, während der letztgenannte unmittelbar aus dem Zellkörper oder aus der Wurzel des Fortsatzes ausgeht, um sich dann vertikal, die innere plexiforme Schicht passierend, in die Nervenfaserschicht zu begeben. DieDogielsche Ansicht, daß einige Fortsätze zu dickeren Zweigen zusammentreten und sich zu einem Achsenzylinder vereinigen, der ebenfalls in die Nervenfaserschicht eintrete, konnten wir nicht bestätigen. Die Zellen enthalten gut ausgebildete Neurofibrillen, die um den Kern herum ein feines engmaschiges Netz ebenso wie in der Ganglienzelle bilden. Die Assoziationsamacrinen und die nervösen Spongioblasten sind sui generis verschiedenartig, von denen die einen nicht nur bei Vögeln, sondern auch bei Säugetieren als überall verbreitet gefunden werden und die anderen dagegen nur bei Vögeln und anderen niedrigen Wirbeltieren, und zwar mit den erstgenannten zusammen vorkommen. Schließlich verdient noch betont zu werden, daß die nervösen Spongioblasten ganglionärer Natur sind, obwohl sie den eigentlichen Ganglienzellen nicht gleichzusetzen sind, weil sie in der inneren plexiformen Schicht Anastomosen bilden, was aber bei den Ganglienzellen nur ausnahmsweise zu beobachten ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01854434
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  • 5
    Electronic Resource
    Electronic Resource
    Graft polymerization of acrylamide onto UV-irradiated films (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 36 (1988), S. 1087-1096 
    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: Graft polymerization of acrylamide was attempted onto the surface of films preirradiated with UV radiation. The films employed are nylon 6, polypropylene, and ethylene-vinyl acetate copolymers. Following UV irradiation in air on films without photosensitizer, they were placed in monomer solution, degassed, and then heated to 50°C to effect the graft polymerization. After rigorous removal of homopolymers, polyacrylamide chains were found to be grafted in the surface region of the films to amounts up to several hundred micrograms per square centimeter of films. An ESCA study revealed the UV-irradiated but not yet grafted surfaces to be oxidized, and formation of peroxides was strongly suggested by the reaction of irradiated films with 1,1-diphenyl-2-picrylhydrazyl. It is likely that the initiator responsible for the graft polymerization is peroxides generated at and near the film surfaces upon UV irradiation. The grafted films became very slippery when contacted with water, in contrast with the films UV-irradiated but not yet grafted.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1988.070360509
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  • 6
    Electronic Resource
    Electronic Resource
    Surface lubrication of polymer films by photoinduced graft polymerization (1990)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 39 (1990), S. 489-498 
    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: Films of nylon 6, polypropylene, and ethylene-vinyl acetate copolymers were graft polymerized with acrylamide or dimethylacrylamide to render the hydrated surfaces slippery. Following UV irradiation in air, the films were placed in the aqueous monomer solution and then either heated to 50°C after degassing or UV-irradiated in the presence of a small amount of riboflavin without degassing to effect graft polymerization. The graft polymerization altered the films from the hydrophobic and nonlubricating to the hydrophilic and slippery surfaces. To evaluate the surface lubricity, the coefficient of friction (μ) against a glass plate in water was determined with the help of a tensile testing machine. The μ value for the films surface-grafted with acrylamide up to 30 μ g cm-2 was reduced to less than 0.05, regardless of the substrate polymers.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1990.070390301
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  • 7
    Electronic Resource
    Electronic Resource
    Graft polymerization of fluorinated monomer onto corona-treated PVA and cellulose films (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 48 (1993), S. 1825-1829 
    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: Surface graft polymerization of a hydrophobic monomer, 2,2,3,3,3-pentafluoropropyl methacrylate (5FMA), onto hydrophilic poly(vinyl alcohol) (PVA) and cellulose films was studied after corona discharge of the films. It was found that grafting strongly depended on the reaction medium; especially, addition of alcohol to the monomer greatly accelerated graft polymerization. For instance, when an ethanol/ water /5FMA mixture (65/25/10, by volume) was used as the polymerization medium. the PVA and cellulose films corona-discharged for a few minutes exhibited a high contact angle up to 100° after 30 min polymerization, the graft density being approximately 170 μg/cm2 for cellulose and 80 μg/cm2 for PVA. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070481016
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  • 8
    Electronic Resource
    Electronic Resource
    XPS Characterization of Surface Functionalized Electroactive Polymers (1996)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 24 (1996), S. 597-604 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Surface modification and functionalization of polyaniline (PAN) and polypyrrole (PPY) films were achieved by Ar plasma treatment, near-UV-induced graft copolymerization with acrylic acid (AAc) and covalent immobilization of an enzyme (trypsin). The compositions and structures of the modified and functionalized polymer surfaces were characterized by angle-resolved XPS. Argon plasma treatment results in minor oxidations of the carbon atoms but is accompanied by a significant decrease in the intrinsic oxidation state ([=N-]/[-NH-] ratio) of the polymers. Graft copolymerization with AAc readily gives rise to self-protonated PAN and PPY surface structures. The surface concentration of the grafted AAc polymer increases with increasing monomer concentration and near-UV irradiation time during grafting but decreases with increasing plasma pretreatment time. Covalent immobilization of trypsin on the AAc-polymer-grafted PAN and PPY films is facilitated by the use of water-soluble carbodiimide intermediate (WSC). The effective enzyme activity increases initially with increasing surface concentration of the grafted AAc polymer, but becomes saturated at moderate to high AAc polymer concentration.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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