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  • 1990-1994  (1)
  • 1970-1974  (2)
  • Chemistry  (2)
  • Duct cell line  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 427 (1994), S. 203-209 
    ISSN: 1432-2013
    Keywords: Cl− channel ; Human submandibular gland ; Duct cell line ; Patch clamp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We have used the single-channel patch-clamp technique to study ion channels in the plasma membrane of the HSG human submandibular gland duct cell line. In cell-attached and excised inside-out patches, at least six channel types were observed. When the pipette contained an isotonic KCl-rich solution and the bath an isotonic NaCl-rich solution, the predominant channel type seen in excised inside-out patches was a Cl− channel with an outwardly rectifying current/voltage (I/V) relation that had a conductance of 12 pS at positive pipette potentials and 43 pS at negative pipette potentials. The channel was only seen in excised patches and its open probability was not significantly increased by membrane depolarization. The channel selectivity sequence (relative to Cl−) was estimated from reversal potential measurements to be: SCN− (1.8)〉NO 3 − (1.4)〉 I− (1.1) ∼ Cl− (1) ∼ Br− (0.8) 〉 acetate (0.35). In inside-out patches the channel was blocked by addition of 5-nitro-2-(3-phenylpropylamino)-benzoate (NPPB) (100 μmol/l) to the bath but not by 9-anthracene carboxylic acid (9-AC) (100 μmol/l). The channel was not activated by increases in the free Ca2+ concentration on the cytosolic surface. This is the first report of an outwardly rectifying Cl− channel in a salivary epithelium. The properties of this channel are not in accordance with the properties of the Cl− conductances in the acinar or duct tissues which have been studied so far and its physiological role is unclear.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 386 (1971), S. 340-344 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Geschwindigkeit der Selbstzersetzung von Fe(OH)2 unter Luftausschluß wurde unter Zusatz von Cu(II) (0-6 Atom-%) bei 30 bis 50°C bestimmt. Das Maximum der Geschwindigkeit und ein Minimum der Aktivierungsenergie tritt bei 1% Cu/Fe auf. Dies wird zwei gleichzeitig wirksamen Einflüssen des Cu zugeschrieben: Erstens der Verzerrung des Koordinationskomplexes durch Cu2+, die die Strukturumwandlung in Magnetit erleichtert, dagegen wirkt negativ der Einfluß des Cu, der zur Vergrößerung der Fe(OH)2-Kristalle führt. Röntgenaufnahmen und elektronenmikroskopische Beobachtungen bestätigen die Annahme.
    Notes: The rate of self-decomposition of iron(II) hydroxide doped with various amounts (0-6 atomic%) of Cu(II) was determined in the absence of oxygen at the temperature range of 30 to 50°C. The maximum rate and the minimum activation energy were observed at 1% Cu/Fe. The result was attributed to the two simultaneous actions of Cu2+, i.e., the distortion effect on coordination complex of Fe2+ by Cu2+ to ease the structural transformation to magnetite and the hindering effect on magnetite formation revealed consequently in the growth of Fe(OH)2 crystals. Both effects were proved by X-ray diffraction and election-microscopic observations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 391 (1972), S. 86-96 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Der Einfluß von Kupfer(II) auf die Kristallisation von α-FeOOHα-FeOOH wurde in mehreren Proben ohne und mit Zusatz von Cu(II)-Ionen (bis zu 5 Atom-%) unter bestimmten Bedingungen dargestellt und röntgeno-graphisch, durch BET, DTA und elektronenmikroskopisch untersucht. Durch Zusatz von 2,5 Atom-% wird die Kristallisation des α-FeOOH vollständig verhindert. Geringe Cu-Zusätze verzögern die Kristallisation. Das Wachsen der Partikel- und Kristallitgrößen von reinem und Cu-dotiertem α-FeOOH unterscheidet sich. Nach der Theorie des Autors wird der Einfluß der Cu2+-Ionen auf die Verzerrung des Koordinationsgitters diskutiert. Es besteht vermutlich ein Zusammenhang zür korrosionshemmenden Wirkung von Kupferzusätzen im Stahl.
    Notes: Various α-FeOOH samples have been prepared with or without addition of Cu(II) (0-5% Cu/Fe) and examined by X-ray diffraction, BET surface area determination, electron-microscopical observation and DTA. Doping with Cu in suitable amounts impedes completely the formation of α-FeOOH. The mechanism of growth, based on the changes of particle size and crystallite dimension, appears to be different between pure and Cu-doped α-FeOOH. The reason of the remarkable effect of Cu on the crystallization process of α-FeOOH is discussed. The effect of Cu is likely relevant to the role of Cu added to anticorrosive steel used in atmospheric environment.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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