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  • 1995-1999  (7)
  • 1996  (7)
  • 1
    Electronic Resource
    Electronic Resource
    A cationic polymer, Eudragit-E, as a new liquid embolic material for arteriovenous malformations (1996)
    Springer
    Neuroradiology 38 (1996), S. S151 
    Details
    ISSN: 1432-1920
    Keywords: udragit-E ; Embolic material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have developed a new liquid material for embolisation of arteriovenous malformations: a mixture of methyl and butyl methacrylate, plus dimethylaminoethyl methacrylate copolymer (Eudragit-E) in a solvent consisting of ethanol and iopamidol. Upon contact with aqueous substances, Eudragit-E precipitates rapidly and forms a soft elastic sponge within 3 s, as the ethanol diffuses. In blood, the positively charged Eudragit-E aggregates the negatively charged blood elements. Transcatheter embolisation of 4 canine and 52 rat renal arteries was feasible. Histological studies revealed no acute inflammatory reaction within 1 week, but mild to moderate reactions in the subacute and chronic stages. No recanalisation was seen. Because of its unique properties and excellent thrombogenicity the Eudragit-E mixture seems a promising embolic material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02278144
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Embolization of cerebral aneurysms with a liquid embolus, EVAL mixture: Report of three cases (1996)
    Springer
    Acta neurochirurgica 138 (1996), S. 294-300 
    Details
    ISSN: 0942-0940
    Keywords: Cerebral aneurysm ; endovascular surgery ; EVAL mixture ; liquid embolus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Embolization of three surgically difficult cerebral aneurysms was performed using our newly developed non-adhesive embolic material, EVAL mixture (ethylene vinyl alcohol copolymer). Conventional embolic materials such as detachable balloons or microcoils were not used because of a large or irregular aneurysmal neck. After temporary occlusion of the parent artery with a superselective balloon catheter, the EVAL mixture was slowly injected through a microcatheter placed in the aneurysm or parent artery. The locations of the aneurysms were anterior communicating artery, basilar artery-posterior cerebral artery and basilar artery-anterior inferior cerebellar artery (BA-AICA). One aneurysmal occlusion and 2 parent artery occlusions were performed. Patients had no persistent deficits. The patient with the BA-AICA aneurysm associated with an arteriovenous malformation died of rupture of the residual AVM due to haemodynamic change 2 weeks after embolization. In selected and limited cases, embolization of surgically difficult cerebral aneurysms using EVAL mixture was more effective and safer than embolization using conventional embolic materials such as balloons and microcoils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411740
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Involvement of Protein Kinase C in γ-Aminobutyric Acid Release from Xenopus Oocytes Injected with Rat Brain mRNA (1996)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 67 (1996), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Involvement of protein kinase C (PKC) in the release of γ-aminobutyric acid (GABA) was examined in Xenopus laevis oocytes injected with mRNA from rat cerebellum, as compared with findings in slices of rat cerebellum. The mRNA-injected oocytes preloaded with [3H]GABA showed spontaneous release of [3H]GABA, ∼0.5% of GABA content per 1 min. Stimulation with either Ca2+ ionophore (A23187) or a high K+ concentration increased the release of [3H]GABA from slices of rat deep cerebellar nucleus and mRNA-injected oocytes but not from noninjected and water-injected oocytes. 12-O-Tetradecanoylphorbol 13-acetate (10–300 nM) but not 4α-phorbol 12,13-didecanoate (300 nM) potentiated the A23187-stimulated release of [3H]GABA from slices and from mRNA-injected oocytes, in a concentration-dependent manner. Thus, machinery associated with release processes of GABA can be expressed in oocytes by injecting rat cerebellar mRNA, and PKC participates in GABA release from the functionally expressed GABAergic nerve terminals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.1996.67020868.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Formation of Schottky barriers at interfaces between metals and molecular semiconductors of p- and n-type conductances (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 1059-1061 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to clarify electronic structures of molecular semiconductor/metal interfaces, a Schottky–Mott rule is examined for vacuum-sublimed films of two kinds of porphyrins, which have similar chemical structures, but opposite conductance types. The result shows that Schottky barrier heights are simply determined by the difference in work function between the porphyrin solids and metals irrespective of the conductance types of the porphyrin semiconductors, indicative of negligible influence of surface states on the Schottky barrier formation. Measurements of photocurrent generation efficiencies at these Schottky junctions indicate that a surface recombination process is not a major deactivation route for electron-hole pairs generated in the molecular semiconductors by light. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116930
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A cationic polymer, Eudragit-E, as a new liquid embolic material for arteriovenous malformations (1996)
    Springer
    Neuroradiology 38 (1996), S. S151 
    Details
    ISSN: 1432-1920
    Keywords: Key words Eudragit-E ; Embolic material
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have developed a new liquid material for embolisation of arteriovenous malformations: a mixture of methyl and butyl methacrylate, plus dimethylaminoethyl methacrylate copolymer (Eudragit-E) in a solvent consisting of ethanol and iopamidol. Upon contact with aqueous substances, Eudragit-E precipitates rapidly and forms a soft elastic sponge within 3 s, as the ethanol diffuses. In blood, the positively charged Eudragit-E aggregates the negatively charged blood elements. Transcatheter embolisation of 4 canine and 52 rat renal arteries was feasible. Histological studies revealed no acute inflammatory reaction within 1 week, but mild to moderate reactions in the subacute and chronic stages. No recanalisation was seen. Because of its unique properties and excellent thrombogenicity the Eudragit-E mixture seems a promising embolic material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002340050941
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Thermally induced structural modification in Pt/C X-ray multilayer mirrors fabricated by electron beam evaporation (1996)
    Springer
    Applied physics 62 (1996), S. 29-32 
    Details
    ISSN: 1432-0630
    Keywords: 68.35.Fx ; 68.60.Dv ; 68.65. + g
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Platinum-carbon multilayer mirrors with a bilayer spacing of 50 Å were fabricated in an ultrahigh vacuum electron beam evaporator. The thermal stability of these multilayers was studied under vacuum annealing using X-ray reflectivity and X-ray diffraction. Up to 450°C, the bilayer spacing increases monotonically accompanied by a gradual increase in crystallite size and grain texture. At 500°C multilayer reflection vanishes, platinum crystallites grow abruptly, and there is a strong texture of platinum in the [220] -plane. Possible reasons for thermally induced structural modifications in these multilayers are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01568083
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Visible light-induced polymerization reactions: The seven-role of the electron transfer process in the dye/iron arene complex/amine system (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 62 (1996), S. 1877-1885 
    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: A new three component photoinitiator system consisting of a dye, an iron arene complex, and a phenylglycine derivative was investigated by fluorescence quenching experiments and laser flash photolysis. The efficiency of a three-component system in photopolymerization reactions is higher by a two-fold factor compared to that of the two-component system. The first step of the photoreaction occurs between the dye and the iron arene complex. The iron arene complex reacts either with the singlet excited dye or with the triplet excited dye according to the nature of the dye. An electron transfer occurs in these systems. The mechanism was discussed in terms of the absence of the formation of a terminating radical in the three-component system. © 1996 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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