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  • Inorganic Chemistry  (5)
  • DNDS  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The mycotoxin ochratoxin A deranges pH homeostasis in Madin-Darby canine kidney cells (1994)
    Springer
    The journal of membrane biology 139 (1994), S. 183-190 
    Details
    ISSN: 1432-1424
    Keywords: Ochratoxin A ; MDCK cells ; Intracellular chloride ; Intracellular pH ; DNDS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Ochratoxin A (OTA) is a nephrotoxin which blocks plasma membrane anion conductance in Madin-Darby canine kidney (MDCK) cells. Added to the culture medium, OTA transforms MDCK cells in a manner similar to exposure to alkaline stress. By means of video-imaging and microelectrode techniques, we investigated whether OTA (1 μmol/liter) affects intracellular pH (pH.), Cl− (Cl i − ) or cell volume of MDCK cells acutely exposed to normal (pHnorm=7.4) and alkaline (pHalk=7.7) conditions. At pHnorm, OTA increased Cl i − by 2.6±0.4 mmol/liter (n=14, P〈0.05) but had no effect on pH i . At pHalk, application of OTA increased Cl i − by 8.6±2.6 mmol/liter (n=10, P〈 0.05) and raised pH i by 0.11±0.03 (n= 8, P〈0.05). The Cl−HCO 3 − exchange inhibitor DNDS (4,4′-dinitro-stilbene-2, 2′-disulfonate; 10 μmol/liter) eliminated the OTA-induced changes of pH i and Cl i − . OTA did not affect cell volume under both pHnorm and pHalk conditions. We conclude that the OTA-induced blockade of plasma membrane anion conductance increases Cl i − without changing cell volume. The driving force of plasma membrane Cl−/HCO 3 − exchange dissipates, leading to a rise of pH i when cells are exposed to an acute alkaline load. Thus, OTA interferes with pH i and Cl i − homeostasis leading to morphological and functional alterations in MDCK cells. The work was supported by the Deutsche Forschungsgemeinschaft (DFG, Si 170/7-1). We thank the Zeiss Company (Oberkochen, Germany) for providing the Attofluor™ video-imaging system for the intracellular Ca2+ measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232622
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  • 2
    Electronic Resource
    Electronic Resource
    Neue Verbindungen vom Typ M3Ln10O18 (M = Ba + Ca; Ln = Sc + Yb, Ho + Y, La + Y) Ein Beitrag zur Besetzung von Oktaedergerüst und TunnelstrukturProfessor Hans-Joachim Seifert zum 60. Geburtstage am 9. November 1990 gewidmet (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 589 (1990), S. 89-95 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Compounds of the M3Ln10O18-Type (M = Ba + Ca; Ln = Sc + Yb, Ho + Y, La + Y). A Contribution about the Occupation of the Octahedra Network and Tunnel StructureThe compounds (I): BaCa2Sc5Yb5O18, (II): BaCa2Ho5Y5O18 and (III): BaCa2La5Y5O18 were prepared and investigated by single crystal X-ray technique. I-III crystallizes in the space group C66—P63, Z = 2. I: a = 17.138; c = 3.217 Å; II: a = 17.765; c = 3.377 Å; III: a = 18.000; c = 3.446 Å. The biggest tunnels of the [Ln9O18]6- network are occupied by Ba2+ the smaller one by Ca2+ and Ln3+ in statistical distribution. Ln3+ on the tunnel positions are I: Yb3+, II: Ho3+ and III: La3+. Considering the comparable radii of Ho3+ and Y3+ the f-orbitals of Ho3+ probable the reason of occupying the tunnel positions with rare earth elements.
    Notes: Die Oxide (I) BaCa2Sc5Yb5O18, (II) BaCa2Ho5Y5O18 und (III) BaCa2La5Y5O18 wurden einkristallin dargestellt und mit Röntgenmethoden untersucht. Sie kristallisieren in der Raumgruppe C66—P63 mit Z = 2. I: a = 17,138; c = 3,217 Å; II: a = 17,765; c = 3,377 Å; III: a = 18,000; c = 3,446 Å. Ba2+ besetzt die großen, Ca2+ mit Ln3+ die kleinen Tunnel des [Ln9O18]6--Oktaedergerüsts. Ln3+ auf Tunnelpositionen ist in I: Yb3+, in II: Ho3+ und in III: La3+. Bei Radiengleichheit von Ho3+ und Y3+ entscheiden vermutlich die f-Orbitale zugunsten der Tunnelbesetzung.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905890110
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  • 3
    Electronic Resource
    Electronic Resource
    BaCu2V2O8: Eine Variante des SrNi2V2O8-Typs, mit Cu2+ in 4+1+1-Koordination (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 591 (1990), S. 167-173 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: BaCu2V2O8: A Variant of the SrNi2V2O8 Type with Cu2+ in 4+1+1 CoordinationBaCu2V2O8 was prepared by solid state reactions below the melting point of the reaction mixture: BaCO3, CuO, V2O5. The isolated deep red single crystals lead to tetragonal symmetry: space group D2d12-I42d, a = 12.744; c = 8.148 Å; Z = 8. The crystal structure is closely related to the SrNi2V2O8 type. The main differene belong to the copper coordination by oxygen.
    Notes: BaCu2V2O8 wurde mit Hilfe von Feststoffreaktionen dicht unterhalb des Schmelzpunktes des Reaktionsgemenges: BaCO3, CuO, V2O5 erhalten. Die isolierten tiefroten Einkristalle führen zur tetragonalen Raumgruppe D2d12-I42d, a = 12,744; c = 8,148 Å; Z = 8. Die Kristallstruktur von BaCu2V2O8 ist eng mit dem SrNi2V2O8-Typ verwandt. Die größten Unterschiede betreffen die Kupferkoordination durch Sauerstoff.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905910119
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  • 4
    Electronic Resource
    Electronic Resource
    Der Übergang von planaren zu tetraedrischen CuO4-Baugruppen in CaCuV2O7 (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 594 (1991), S. 119-126 
    Details
    ISSN: 0044-2313
    Keywords: Calcium ; Copper ; Vanadium ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Shift from Planar to Tetrahedric CuO4 Groups in CaCuV2O7Single crystals of CaCuV2O7 were prepared by solid state reaction closely below the melting point. It crystallizes with monoclinic symmetry, space group C2h4-P2 c; a = 10.01; b = 8.85; c = 10.19 Å; β = 91.03°; Z = 8. CaCuV2O7 represent a new structure type with VO4-tetrahedra, CaO6-octahedra, and CaO7-bipyramids. The surrounding of Cu2+ can be interpreted by a twisted planar coordination.
    Notes: Einkristalle von CaCuV2O7 wurden dicht unterhalb des Schmelzpunktes der Reaktionsmischung erhalten. Diese Verbindung kristallisiert monoklin, a = 10,01; b = 8,85; c = 10,19 Å; β = 91,03°; Z = 8. CaCuV2O7 repräsentiert einen neuen Strukturtyp mit VO4-Tetraedern, CaO6-Oktaedern und pentagonalen CaO7-Bipyramiden. Die Umgebung von Cu2+ kann als verdreht planar aufgefaßt werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915940114
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  • 5
    Electronic Resource
    Electronic Resource
    Ein zweites Erdalkalimetall-Kupferoxovanadat: SrCuV2O7 (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 594 (1991), S. 127-132 
    Details
    ISSN: 0044-2313
    Keywords: Strontium ; Copper ; Vanadium ; Crystal Chemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On a Second Alkaline Earth-Copper Oxovanadate: SrCuV2O7Single crystals of SrCuV2O7 were prepared by solid state reaction in the order of the meltingpoint of the component mixture. The yellowgreen crystals have orthorhombic symmetry, space group D2h16-Pnma; a = 14.470; b = 5.470; c = 7.420 Å; Z = 4. SrCuV2O7 represent a new crystal structure with V5+ in tetrahedric coordination, forming V2O7-double-tetrahedra, which are connected with CuO5 square pyramids into planes. Sr2+ between these planes has a complicated surrounding of 11 O2-. The structure is discussed with respect to the not isotypic compound CaCuV2O7.
    Notes: Einkristalle von SrCuV2O7 wurden durch Feststoffreaktion im Bereich des Schmelzpunktes der Reaktionsmischung erhalten. Die gelbgrünen Kristalle haben orthorhombische Symmetrie, Raumgruppe D2h16-Pnma; a = 14,470; b = 5,470; c = 7,420 Å; Z = 4. SrCuV2O7 repräsentiert eine neue Kristallstruktur, die V5+ in tetraedrischer Koordination zeigt. Es treten isolierte V2O7-Tetraederdoppel auf, die mit CuO5-Pyramiden in Ebenen verknüpft sind. Sr2+ hat eine komplizierte Umgebung von 11 O2-. Die Struktur wird mit der nicht isotypen Verbindung CaCuV2O7 diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915940115
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von (Ba0,5Sr0,5)Cu2V2O8 und Ba(CuMg)V2O8 (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 602 (1991), S. 149-154 
    Details
    ISSN: 0044-2313
    Keywords: Alkaline earth ; copper ; vanadium ; oxide ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On (Ba0,5Sr0,5)Cu2V2O8 and Ba(CuMg)V2O8Single Crystals of (A): (Ba0.5Sr0.5)Cu2V2O8 and (B) Ba(CuMg)V2O8 were prepared by solid state reactions below the melting points of the starting mixtures. Both compounds were examined by X-ray technique. They crystallize in the space groups (A): 142d [No. 122]; a = 12.65; c = 8.18 Å; Z = 8; and (B): 141/acd [No. 142]; a = 12.50; c = 8.33 Å; Z = 8. In (A) are Ba2+ plus Sr2+ and in (B) are Cu2+ plus Mg2+ in statistical distribution. The square pyramidal Cu2+ coordination in (A) is changed to an octahedron in (B), by replacing Cu2+ by Mg2+.
    Notes: Einkristalle von (A): (Ba0,5Sr0,5)Cu2V2O8 und (B): Ba(CuMg)V2O8 wurden durch Feststoffreaktionen dicht unterhalb des Schmelzpunktes der jeweiligen Reaktionsgemenge erhalten. Zellparameter und Atompositionen wurden röntgenographisch bestimmt. Die Verbindungen kristallisieren in den Raumgruppen (A): 142d, [Nr. 122] mit a = 12,65; c = 8,18 Å; Z = 8; (B): 141/acd; [Nr. 142] mit a = 12,50; c = 8,33 Å; Z = 8. In (A) sind Ba2+ und Sr2+, in (B) Cu2+ und Mg2+ statistisch verteilt. Die tetragonal pyramidale Koordination von Cu2+ in (A) ändert sich durch den Einbau von. Mg2+ in (B) in eine gestreckt oktaedrische.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916020116
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