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  • 1985-1989  (5)
  • Chemistry  (4)
  • Cell & Developmental Biology  (1)
  • crystal structure
  • 1
    Electronic Resource
    Electronic Resource
    Orthokinetic and klinokinetic responses of human polymorphonuclear leucocytes (1985)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 5 (1985), S. 447-461 
    Details
    ISSN: 0886-1544
    Keywords: chemokinesis ; orthokinesis ; klinokinesis ; polymorphonuclear leucocytes ; locomotion ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Evidence is presented to show that klinokinesis, which was previously demonstrated in bacteria and amoeba only, may also occur in metazoan cells. The chemotactic peptide formyl-Met-Leu-Phe (fMLP) elicited orthokinetic and klinokinetic responses of human blood-borne polymorphonuclear leucocytes (PMNs) under the test conditions used. Increased speed (orthokinesis) was due to an increase in the proportion of migrating cells as well as in the speed of the locomoting subset. The klinokinetic effect was manifested by a decrease in the klinolocomotion index, the mean angle of changes in direction ≥ 90°, and the frequency of turns ≥ 90°. The klinolocomotion index was inversely related to speed. This explains the synergistic effect of klinokinesis and orthokinesis in this system. Colchicine alone had and orthokinetic effect which was exclusively due to alterations in the proportion of migrating cells and it altered the turning behaviour without exerting a klinokinetic effect. However, colchicine had marginal orthokinetic and klinokinetic effects on fMLP-stimulated cells resulting in reduced translocation. The relationship between klinokinesis and mean angle or frequency of turns has been analysed. Klinokinesis was a substantial though not the major element of the chemokinetic response to fMLP under the conditions used. No other metazoan cells have been shown to possess such a complete pattern of responses, including orthokinesis, klinokinesis, and chemotaxis, which regulate locomotion.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970050603
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  • 2
    Electronic Resource
    Electronic Resource
    Ag2PdCl4, Kristallstruktur und die kristallchemische Beziehung zum NaCl-Typ (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 562 (1988), S. 123-130 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ag2PdCl4, Crystal Structure and the Crystal Chemical Relation to the NaCl TypeAg2PdCl4 single crystals show orthorhombic symmetry with the space group Cmca (No. 64) and the lattice parameters a = 10.088(2), b = 8.051(5), c = 8.078(2) å, with 4 formular units per unit cell. The atomic arrangement of Ag2PdCl4 is explored by X-ray crystal structure analysis.Silver shows a distorted octahedral arrangement of chlorine atoms. Palladium forms typical, approximately square-planar PdCl4 groups. Ag2PdCl4 is a new variant of a partially occupied sodium chloride structure type.
    Notes: Die Kristallstruktur von Ag2PdCl4 wurde mit röntgenographischen Methoden an Einkristallen ermittelt. Ag2PdCl4 kristallisiert mit orthorhombischer Symmetrie: Cmca (No. 64), a = 10,088(2), b = 8,051(5), c = 8,078(2) å mit 4 Formeleinheiten pro Elementarzelle.Silber besitzt eine verzerrt oktaedrische Chlor-Nachbarschaft, während das Palladium annähernd quadratisch planare PdCl4-Gruppen bildet. Ag2PdCl4 stellt eine neue Variante einer teilbesetzten Natriumchloridstruktur dar.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885620115
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  • 3
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von AgPb4O4CI, eine kuriose Variante des Blei(II)-oxid-Strukturtyps (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 62-70 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of AgPb4O4Cl, a Curious Variant of the Tetragonal Structure Type of PbOAgPb4O4Cl was prepared for the first time and the crystal structure was explored by single crystal measurement. The compound crystallizes with tetragonal symmetry in space group P4/n - No. 85 with a = 8.197(2) Å, c = 6.257(4) Å and two formulae per unit cell. The structure was refined by full matrix least-squares techniques to an R value of 0.049. AgPb4O4Cl shows a typical layer structure. Layers of Pb2+, Ag+ and O2- are separated by chloride layers. The crystal-chemical relations to the structural arrangement of the tetragonal modification of PbO is shown.
    Notes: AgPb4O4Cl wurde erstmalig dargestellt und die Kristallstruktur an Einkristallen aufgeklärt. AgPb4O4Cl kristallisiert tetragonal (Raumgruppe P4/n - No. 85) mit a = 8,197(2) Å, c = 6,257(4) Å und Z = 2. Die Verfeinerung der Einkristallmessung mittels der Methode der kleinsten Fehlerquadrate ergab den Gütefaktor Rw = 0.049. AgPb4O4Cl zeigt eine Schichtstruktur, wobei Chloridionen die Schichten aus Pb2+, Ag+ und O2- trennen. Die kristallchemische Beziehung zum Aufbau der tetragonalen Modifikation von PbO wird dargelegt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885660109
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  • 4
    Electronic Resource
    Electronic Resource
    Pb13O10Br6, ein neuer Vertreter der Blei(II)-oxidhalogenide (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 571 (1989), S. 139-147 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of Pb13O10Br6, a New Lead OxidehalideStrongly yellow Pb13O10Br6 was prepared for the first time and the crystal structure was explored by single crystal measurement. The compound crystallizes with monoclinic symmetry in space group C2/c - No. 15 with a = 16.439(6) Å, b = 7.163(1) Å, c = 23.940(9) Å, β = 98.39(3)° and four formulas per unit cell. The structure was refined by full matrix least-squares techniques to Rw = 0.0727 (2 030 reflections with I ≥ 3σ(I), MoKα, 4-circle-diffractometer AED2). Regions of lead(II) oxide exists within the structure, which are separated from the content of bromide. Pb13O10Br6 is a connecting link between oxidehalides and the tetragonal modification of PbO.
    Notes: Pb13O10Br6 wurde erstmalig dargestellt und die Kristallstruktur an Einkristallen aufgeklärt. Pb13O10Br6 ist von kräftig gelber Farbe und kristallisiert monoklin (Raumgruppe C2/c - No. 15) mit a = 16,439(6) Å, b = 7,163(1) Å, c = 23,940(9) Å, β = 98,39(3)° und Z = 4. Die Verfeinerung der Parameter mittels der kleinsten Fehlerquadrate ergab Rw = 0,0727 (2 030 Reflexe mit I ≥ 3σ(I), MoKα Vierkreisdiffraktometer AED2). Die Verbindung zeigt in ihrem Aufbau eine deutliche Trennung in oxidische und halogenidische Bereiche. Pb13O10Br6 stellt ein Bindeglied in der Verbindungsreihe der Oxidhalogenide und tetragonalem PbO dar.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895710115
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  • 5
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Blei(II)-monoglycerat (1987)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 550 (1987), S. 102-108 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Lead(II) MonoglycerolateCrystals of lead(II) monoglycerolate, of a quality suitable for diffraction studies, have been prepared from an alkaline plumbate solution and an excess of glycerol. The compound crystallizes in the monoclinic space group P21/c with a = 5.617(6) Å, b = 9.471(8) Å, c = 9.726(7) Å, β = 102.65(11)°. The structure was refined by full matrix least-squares techniques to an R value (1026 F0) of 0.078. The compound to which the formula Pb(C3H6O3) could be assigned, is polymeric in one direction. The lead and a part of the oxygen atoms built up a zig-zag chain parallel to the aaxis. The oxygen form a distorted tetragonal pyramid with lead at the apex. A decomposition temperature of 235°C has been determined.
    Notes: Blei(II)-monoglycerat kristallisiert monoklin (Raumgruppe P21/c) mit a = 5,617(6) Å, b = 9,471(8) Å, c = 9,726(7) Å, β = 102,65(11)° und Z = 4. Die Verfeinerung der Kristallstruktur mittels der Methode der kleinsten Fehlerquadrate ergab R = 0,078.Pb(C3H6O3) zeigt einen bemerkenswerten Aufbau. An der Koordination von Blei sind jeweils vier Glyceratdianionen beteiligt. Dabei heben sich Vierecke, die aus Blei und Sauerstoff gebildet werden, heraus. Diese Vierecke sind zickzackförmig miteinander verbunden und verlaufen parallel zur a-Achse. Untereinander sind diese eindimensional unendlichen Zickzackbänder durch die Glyceratreste abgeschirmt. Nach DTA-Untersuchungen ist die Zersetzungstemperatur von Blei(II)-monoglycerat 235°C.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19875500711
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