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  • Wiley-Blackwell  (8)
  • Nature Publishing Group
  • 1975-1979  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Hydratstufen und Kristallstrukturen von Bariumchlorid (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 441 (1978), S. 181-195 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrates and crystal Structure of Barium ChlorideThe dehydrating process of BaCl2 · 2H2O and the phase transformations of BaCl2 were observed by using a modified high temperature X-ray camera. The following compounds appeared with increasing temperature: BaCl2 · 2H2O → BaCl2 · 1H2O → BaCl2(cubT) [BaCl2(hex)]→ α-BaCl2(ortho) → β-BaCl2(cubH). The phase BaCl2(cubT) is supposed to be the metastable low temperature form of β-BaCl2(cubH). Structural relationships were demonstrated by comparing the different phases of the BaCl2—H2O system.
    Notes: Dei Dehydratisierung von BaCl2 · 2H2O und die Phasenumwandlungen von BaCl2 wurden röntgenographisch in einer modifizierten Heizkamera Verfolgt. Mit Steigender Temperatur traten folgende Verbindungen auf: BaCl2 · 2H2O → BaCl2 · 1H2O → BaCl2 (cubT) [BaCl2(hex)]→ α-BaCl2(ortho)→ β-BaCl2(cubH). Es muß angenommen werden, daß BaCl2(cubT) die metastabile Tieftemperaturform von β-BaCl2(cubH) ist. Bei einem Vergleich der Strukturen im System BaCl2—H2O wurden kristallchemische Zusammenhänge aufgezeigt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784410120
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  • 2
    Electronic Resource
    Electronic Resource
    A proposed specification for acrylic bone cement (1975)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 9 (1975), S. 105-117 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A proposed specification covering handling characteristics and physical and chemical properties of bone cement composed primarily of methyl methacrylate has been prepared on the basis of data from the authors' studies and from various other sources. Under handling characteristics, requirements included relate to dough, handling and setting time, proper plasticity for insertion and temperature rise on setting. Mechanical properties specified include compressive strength and indentation and recovery characteristics. Maximum limits are proposed for water sorption and solubility. Suggested packaging requirements are also included.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820090415
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of the ingredients and determination of the residual components of acrylic bone cements (1977)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 11 (1977), S. 577-607 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: Rapid and reliable methods for the characterization and quantitative determination of ingredients usually present in self-curing methacrylate bone cements were developed using spectrophotometric, gas chromatographic (GC), and conventional gravimetric procedures. These procedures are applicable to non-crosslinked methacrylate resins. In the presence of some copolymers, polymer blends or crosslinking agents, or other ingredients which will result in the formation of insoluble methacrylate resins, some modification of the identification procedures and quantitative estimation of the resin components will be required. Molecular weight and molecular weight distribution of the powder and cured cement were obtained from viscosity and gel-permeation measurements. Residual low molecular weight materials in the cured cement were determined for various storage times. Residual and water-leachable monomer and residual dimethyl-p-toluidine (DMPT) were measured by GC. In air, the monomer content of the cured resin decreased from 3.3% after 1 hr to 2.4% after 215 days. When stored in water at 37°C, over 65% of the extractable monomer is leached out within 10 min. After 6 hr, the rate of diffusion of monomer into the aqueous phase is low. The cured cement contains as much as 0.6% DMPT, which does not leach out. Residual peroxide, estimated spectrophotometrically, amounts to 0.8%, but decreases to 0.14% after 15 months in water at 37°C. A semiquantitative colorimetric test indicated that the hydroquinone content of specimens analyzed within 24 hr after curing amounted to 9 ppm.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820110412
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  • 4
    Electronic Resource
    Electronic Resource
    Die Kristall- und MolekülStruktur des Ammoniumtrifluormethylsulfonats bei 20°C (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 415 (1975), S. 125-132 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Ammoniumtrifluoromethylsulfonate at 20°CAmmoniumtrifluoromethylsulfonate crystallizes with the space group P4/nmm with a = 7.176(3) Å; c = 6.052(3) Å; Z = 2. Crystal structure could be solved from single crystal data by Patterson method and with refinement of the atomic positions by full-matrix technique. The final R value of R = 0.145 could not be further improved. The CF3SO3 groups are hydrogen bonded to the NH4+ ion to form layers normal to c axis. Oxygen atoms are distributed in statistical manner on crystallographic positions of higher point symmetry than corresponds to the composition of the molecule. The same holds for fluorine atoms.
    Notes: Ammoniumtrifluormethylsulfonat kristallisiert tetragonal mit a =7,176(3) Å; c = 6,052(3) Å in der Raumgruppe P4/nmm; die Elementarzelle enthält zwei Formeleinheiten. Aus Einkristalldaten konnte mittels der Patterson-Methode und einer Strukturverfeinerung der Full-Matrix-Technik die Struktur im Prinzip gelöst, aber nur bis zu einem R-Wert von R = 0,145 verfeinert werden. Die CF3SO3-Anionen bilden danach eine Art Schichtengitter, wobei drei Anionen über ein Ammonium-Ion miteinander durch Wasserstoffbrücken verbunden sind. Bei konstanter Gestalt des Anions im Gesamtgitter besetzen sowohl F- als auch O-Atome höherzählige Punktlagen als der Molekülformel entspricht. Dies bedeutet eine statistische Unterbesetzung dieser Punktlagen in der Elementarzelle.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754150206
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  • 5
    Electronic Resource
    Electronic Resource
    Hydratstufen und Kristallstrukturen von Strontiumchlorid und Europium(II)-chlorid (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 450 (1979), S. 36-44 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrates and Crystal Structures of Strontium Chloride and Europium DichlorideThe dehydrating processes of SrCl2 · 6 H2O and EuCl2 · 2 H2O and the phase transformations involved were observed using a high temperature X-ray camera. The following phases appeared with increasing temperatur in the SrCl2—H2O system: SrCl2 · 6 H2O → SrCl2 · 2 H2O → SrCl2 · 1 H2O → SrCl2(cub), and in the EuCl2—H2O system: EuCl2 · 2 H2O → EuCl2 · 1 H2O → EuCl2 · wH2O → EuCl2(ortho), [EuCl2(kub)].
    Notes: Die Dehydratisierung von SrCl2 · 6 H2O und von EuCl2 · 2H2O sowie die dabei auftretenden Phasenumwandlungen wurden röntgenographisch in einer Heizkamera verfolgt. Mit steigender Temperatur wurden im System SrCl2—H2O folgende Phasen beobachtet: SrCl2 · 6 H2O → SrCl2 · 2 H2O → SrCl2 · 1 H2O → SrCl2(kub), im System EuCl2—H2O die Phasen EuCl2 · 2 H2O → EuCl2 · 1 H2O → EuCl2 · wH2O → EuCl2(ortho), [EuCl2(kub)].
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794500104
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  • 6
    Electronic Resource
    Electronic Resource
    Sauerstoff-Perowskite mit vierwertigem NeodymProfessor Walter Rüdorff zum 70. Geburtstage am 3. Oktober 1979 gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 456 (1979), S. 41-53 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxygen Perovskites with Tetravalent NeodymiumWe succeeded in stabilising tetravalent neodymium by incorporating it in hostlattices with the perovskite structure. BaCeO3, BaPrO3, BaThO3, and BaZrO3 have been used for host-lattices. The samples were prepared by heating the corresponding oxides on air and at 1 250-1400°C. X-ray diffraction and chemical analysis showed that Nd(IV) has been stabilised in different rates by these four host-lattices. BaCeO3 is able to incorporate Nd(IV) up to 30%, BaPrO3 up to 18%, BaThO3 up to 17% and BaZrO3 up to 4%.
    Notes: Es gelang, vierwertiges Neodym durch Einbau in Wirtsgitter mit Perowskitstruktur zu stabilisieren. Als Wirtsgitter wurden BaCeO3, BaPrO3, BaThO3 und BaZrO3 eingesetzt. Die Präparation erfolgte durch Glühen der entsprechenden Oxide an Luft bei 1 250-1400°C. Röntgenographische und analytische Charakterisierung ergaben, daß Nd(IV) von den vier Wirtsgittern in unterschiedlichen Mengen stabilisiert wird. BaCeO3 vermag bis zu 30%, BaPrO3 bis zu 18%, BaThO3 bis zu 17% und BaZrO3 bis zu 4% Nd(IV) aufzunehmen.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794560104
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  • 7
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Niob-Tantal-Nitridphasen (Nb, Ta)N∼1Professor Günther Rienäcker gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 452 (1979), S. 17-26 
    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 Structures of Niobium-Tantalum-Nitride Phases (Nb, Ta)N∼1Ta—Nb alloys with graduated composition are nitrided with NH3 at 1100-1450°C. The mononitrides formed are investigated by X-ray diffraction. Their nitrogen content is evaluated by chemical analysis. Seven Ta—Nb nitride phases are observed. Depending on the temperature, the phases appear in a strictly defined sequence along the variation of the Ta:Nb relation. Corresponding to this sequence, the density (formula volume) of this nitride phases varies.
    Notes: Ta—Nb-Legierungen abgestufter Zusammensetzung werden mit NH3 bei 1100-1450°C nitridiert. Die entstehenden Mononitride werden röntgenographisch auf ihre Phasenzusammensetzung, analytisch auf ihren Stickstoffgehalt untersucht. Es treten insgesamt sieben Ta—Nb-Nitridphasen auf. In Abhängigkeit von der Temperatur erscheinen die Phasen in bestimmter Reihenfolge bei Veränderung des Ta:Nb-Verhältnisses. Parallel dazu ergibt sich eine stetige Sequenz der Dichten (Formelvolumina) dieser Nitridphasen.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794520104
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  • 8
    Electronic Resource
    Electronic Resource
    Durability of the bond between bone and various 2-cyanoacrylates in an aqueous environment (1979)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 13 (1979), S. 593-606 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: The durability of the bond strength developed between 2-cyanoacrylate esters and bone has been determined by aging specimens in water. One-day bond strength of the isobutyl and isomeric amyl 2-cyanoacrylates varied from 6.2 to 7.2 MPa. The strength of the bond decreased on storage or on thermocycling in water. Hydrolytic stability increased with increasing length of the alkyl ester group. After a six-month storage in water the various amyl 2-cyanoacrylates retained from 70% to 73% of their one-day bond strength. Pretreatment of the bone surface prior to application of the adhesive did not prove beneficial. The cured 2-cyanoacrylate can be removed from the substrate surface by appropriate solvents. Thus, it is not bonded covalently to bone. The bond strength, especially of the isobutyl and amyl 2-cyanoacrylates to bone in an aqueous environment, appears to be superior to other adhesives. Provided these monomers are biocompatible, they may be useful clinically where an intermediate-term adhesion is desired.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820130406
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