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  • 1
    Electronic Resource
    Electronic Resource
    Design and biomechanical evaluation of a cementable endosteal blade implant (1976)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 10 (1976), S. 571-581 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: A cementable endosteal blade implant has been developed and evaluated. Inherent in the design are the following factors: minimization of stress concentrators, ease of implantation, and high resistance to loosening. Other potential advantages of this design as compared with conventional endosteal blade implants include reduced hazards of postoperative infection and reduced likelihood of metallic corrosion.Six conventional endosteal implants and six cementable implants were installed in steer mandibles using standard dental surgical techniques and Simplexbrand methyl methacrylate bone cement. They were loaded in uniaxial compression at a loading rate of 0.0122 in./min. The stiffness (S), deformation at 900-lb load (D900), proportional limit (PL), and load at 0.04 in. deformation (L0.04) were calculated for each test.The cementable design showed a twofold increase in stiffness, only 17% of the deformation at 900 lb, more than twice the proportional limit, and at least twice the load at 0.04 in. deformation when compared with similar values for the conventional endosteal implants.This study reveals that, in addition to being unstable in bone, conventional endosteal implants are also unstable when used with acrylic bone cement. The new design should eliminate most of the problems associated with endosteal blade implantation.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820100414
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  • 2
    Electronic Resource
    Electronic Resource
    Quantitative Untersuchungen zum Aushärtungsverhalten von Phenoplasten mittels differentialthermoanalytischer Messungen (DSC)Herrn Prof. Dr. phil. O. Hromatka zum 70. Geburtstag gewidmet (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 49 (1976), S. 115-128 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In this paper the attempt is made to investigate the curing behaviour of some phenol formaldehyde resins by means of DSC-analysis. With a special dynamic-static test programme the amount of curing could be determined as a function of the time of curing, the temperature of curing and the heating rate. Furthermore the temperature of curing and the required time for a certain degree of curing of a given resin could be determined. The interpretation of the results leads to the conclusion that the activation entropy of the crosslinking reaction increases significantly with increasing degree of crosslinking.
    Notes: In der vorliegenden Untersuchung wird der Versuch unternommen, mittels DSC-Analyse das Aushärtungsverhalten verschiedener Phenol-Formaldehyd-Harze näher zu studieren. Unter Verwendung eines speziellen dynamisch-statischen Versuchsprogramms ist es gelungen, den Aushärtungsgrad in Abhängigkeit von der Härtungszeit, der Härtungstemperatur und der gerätebedingten Aufheizrate experimentell zu bestimmen. Weiterhin war es möglich, die für einen bestimmten Aushärtungsgrad eines vorgegebenen Harzes notwendige Härtetemperatur und die notwendige Zeit der Härtung zu bestimmen. Die Interpretation der Meßergebnisse läßt den Schluß zu, daß die Aktivierungsentropie der Vernetzungsreaktion mit zunehmendem Vernetzungsgrad deutlich zunimmt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050490110
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  • 3
    Electronic Resource
    Electronic Resource
    Kristallstruktur des Natrium-tert-butoxids, [(CH3)3CONa]9 · [(CH3)3CONa]6, ein neuer Strukturtyp mit nonameren und hexameren Assoziaten (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3388-3396 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of Sodium tert-Butoxide, [(CH3)3CONa]9 · [(CH3)3CONa]6, a New Type of Structure with Nonameric and Hexameric UnitsThe title compound forms monoclinic crystals (space group Cc). Its structure has been determined by X-ray analysis and refined to R = 0.109. The asymmetric unit contains one nonameric and one hexameric unit. The latter has a skeleton with O and Na atoms alternately at the corners of a hexagonal prism. In the nonamer the O  -  Na skeleton is formed by two hexagons and three additional O  -  Na pairs between them. Thus these atoms are arranged on three parallel planes. Together with the external tert-butyl groups there results an almost spherical aggregate.  -  In the mass spectrum there exists no fragment heavier than the heptamer. This has also been shown for sodium trimethylsiloxide. Cell parameters and space group of this latter compound have also been determined.
    Notes: Die Titelverbindung kristallisiert monoklin (Raumgruppe Cc). Ihre Struktur wurde röntgenographisch bestimmt und bis R = 0.109 verfeinert. Die asymmetrische Einheit enthält ein nonameres und ein hexameres Assoziat. Im Gerüst des letzteren besetzen O- und Na-Atome alternierend die Ecken eines hexagonalen Prismas. Im Nonameren wird das O-Na-Skelett von zwei Hexagonen gebildet, zwischen denen noch drei O-Na-Paare liegen. Auf diese Weise sind alle O- und Na-Atome auf drei parallelen Ebenen angeordnet. Zusammen mit den außen liegenden tert-Butylgruppen resultiert ein fast kugelförmiges Assoziat.  -  Im Massenspektrum finden sich keine schwereren Fragmente als die des Heptameren. Dies konnte auch für Natriumtrimethyl-silanolat gezeigt werden. Ferner wurden die Zellparameter und Raumgruppe dieser Verbindung bestimmt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771101018
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Röntgenstrukturanalyse eines Adamantyl-spiro-phosphorans, C10H15P(O2C6H4)2 (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1464-1469 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and X-Ray Structural Analysis of an Adamantyl-spirophosphorane, C10HI5P(O2C6H4)Reaction of (1-adamantyl)tetrafluorophosphorane with catechol bis(trimethylsilyl ether) yielded the spirophosphorane C10H15P(O2C6H4)2 (4). Crystals of 4 are orthorhombic. P212121, with a = 668.5 (1), b = 1575.8 (2), c = 1755.1 (2) pm, Z = 4, R = 0.058. C2v,-distorted rectangular pyramidal coordination is observed at phosphorus.
    Notes: Durch Umsetzung von (1-Adamantyl)tetrafluorphosphoran mit Brenzcatechin-bis(trimethylsilylether) wurde das Spirophosphoran C10H15P(O2C6H4)2 (4) erhalten. 4 kristallisiert orthorhombisch, P212121, mit a = 668.5 (1), b = 1575.8 (2), c = 1755.1 (2) pm, Z = 4,. R, = 0.058. Es wird C2v-verzerrte rechteckig-pyramidale Koordination am Phosphor gefunden.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120440
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  • 5
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXXXV. Pentacarbonyl(organylcarben)chrom- und -wolfram-Reste als Amino-Schutzgruppen für Peptid-Synthesen (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1868-1886 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXXXV. Pentacarbonyl (organylcarbene)chromium and-tungsten as Amino-Protecting Groups in Peptide SynthesesPentacarbonyl(methoxyorganylcarbene) complexes of chromium and tungsten (organyl = CH3, C6H5) react with amino acid esters to give aminocarbene complexes, in which the pentacarbonyl (organylcarbenyl) groups act as amino-protecting groups (1-15. The alkaline hydrolysis of the esters yields derivatives with free carboxyl groups (16-18), at which peptide coupling reactions are carried out by means of the dicyclohexylcarbodiimide /N-hydroxysuccinimide (DCCD/HOSU) method. The carbene complex protective groups can be cleaved off with trifluoroacetic acid (TFE) In the case of pentacarbonyl (organylcarbenyl) tungsten groups side reactions are observed. The cleavage of the carbene complex protecting group may also be achieved with 80% acetic acid. The pentacarbonyl(phenylcarbenyl) tungsten group of Wpc-Gly-OMe (8) can be cleaved off by BBr3 at - 25°C.
    Notes: Pentacarbonyl(methoxyorganylcarben)-Komplexe des Chroms und Wolframs (Organyl = CH3, C6H5) reagieren mit Aminosäureestern zu Aminocarben-Komplexen, in denen die Pentacarbonyl-(organylcarbenyl)-Reste als Amino-Schutzgruppen wirken (1-15). Die alkalische Verseifung der Ester liefert Derivate mit freier Carboxylgruppe (16-18), an denen Peptidverknüpfungen mit Hilfe der Dicyclohexylcarbodiimid/N-Hydroxysuccinimid (DCCD/HOSU)-Methode durchgeführt werden. Die Carbenkomplex-Schutzgruppen können mit Trifluoressigsäure (TFE) wieder abgespalten werden. Dabei beobachtet man bei Pentacarbonyl(organylcarbenyl)wolfram-Gruppen Nebenreaktionen. Die Abspaltung der Carbenkomplex-Schutzgruppe gelingt auch mit 80proz. Essigsäure. Die Pentacarbonyl(phenylcarbenyl)wolfram-Gruppe von Wpc-Gly-O Me (8) läßt sich mit BBr3 bei - 25°C abspalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090529
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  • 6
    Electronic Resource
    Electronic Resource
    Kristallstruktur des Kupfer(I)-tert-butoxids, [CH3)3 COCu]4 (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3142-3146 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of Copper(I) tert-Butoxide, [CH3)3COCu]4The title compound, prepared form anhydrous CuCl and (CH3)3COLi in THF, forms triclinic crystals (space group P 1). The structure has been determined by X-ray analysis and refined to R = 0.071. Four formula units form a planar ring containing four copper atoms and four oxygen atoms. According to the mass spectrum the compound forms tetrameric units also in the vapour phase.
    Notes: Die aus Wasserfreiem CuCl und (CH3)3COLi in THF dargestellte Titelverbindung Kristallisiert triklin (Raumgruppe P 1). Die Struktur wurde röntgenographisch bestimmt und bis R = 0.071 verfeinert. Vier Formeleinheiten bilden einen planaren Ring, in dem alternierend vier Kupfer- und vier Sauerstoff-Atome miteinander verbunden sind. Auch im Gaszustand liegen nach dem Massenspektrum tetramere Einheiten vor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090920
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  • 7
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Hydronium-tetrachloroaurat(III)-2,2-dimethyl-2H-benzimidazol-1,3-dioxid, (C9H10N2O2)H3O+[AuCl4]- (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 1684-1690 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of Hydronium Tetrachloroaurate(III)-2,2-dimethyl-2H-benzimidazole 1,3-Dioxide, (C9H10N2O2)H3O+ [AuCl4]-1,2-Benzoquinone dioxime (1) reacts with tetrachlorogold(III) acid-trihydrate in dialkyl ketones as solvents to yield solids 5-7 which contain H3O+ and [AuCl4]- ions and neutral 2,2-dialkyl-2H-benzimidazole 1,3-dioxides (2-4). The organic, neutral molecule can easily be isolated from this solid by means of an ion-exchanger. The structure of hydronium tetrachloroaurat(III)-2,2-dimethyl-2H-benzimidazole 1,3-dioxide (5), which can be obtained from acetone solutions, is obtained by X-ray analysis.
    Notes: Die Reaktion von 1,2-Benzochinondioxim (1) mit Tetrachlorogold(III)-säure-trihydrat in Dialkyl-ketonen als Lösungsmittel führt zu Festkörpern 5-7, die aus H3O+- und [AuCl4]--Ionen sowie aus neutralen 2,2-Dialkyl-2H-benzimidazol-1,3-dioxiden (2-4) aufgebaut sind. Daraus läßt sich das organische neutrale Molekül mittels eines Ionenaustauschers abtrennen und in Substanz isolieren. Die Struktur des aus Aceton erhältlichen Hydronium-tetrachloroaurat(III)-2,2-dimethyl-2H-benzimidazol-1,3-dioxids (5) wird durch Röntgenstrukturanalyse ermittelt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100513
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  • 8
    Electronic Resource
    Electronic Resource
    Über Metallalkyl- und -aryl-Verbindungen, XX: Darstellung und Kristallstruktur des dimeren Phenyllithium · N, N, N′, N′-Tetramethylethylendiamins, Bis[μ-phenyl-(N, N, N′, N′-tetramethylethylendiamin)lithium] (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3157-3161 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Alkyl and Aryl Compounds, XX: Preparation and Crystal Structure of Dimeric Phenyllithium · N, N, N′, N′-Tetramethylethylenediamine, Bis[μ-phenyl-(N, N, N′, N′-tetramethylethylenediamine)lithium]The adduct phenyllithium · N, N, N′, N′-tetramethylethylenediamine has been prepared and its crystal structure determined by X-ray methods (R = 0.066, 1595 significant reflections). The monoclinic unit cell (space group C2/c) contains 4 molecules of a dimer. Similar to dimeric triphenylaluminium in each molecule two Li atoms are linked by two phenyl bridging groups. By the addition of one diamine ligand each Li atom obtains fourfold coordination.
    Notes: Das Addukt Phenyllithium · N, N, N′, N′-Tetramethylethylendiamin wurde dargestellt und seine Kristallstruktur röntgenographisch ermittelt (R = 0.066, 1595 signifikante Reflexe). Die monokline Elementarzelle (Raumgruppe C2/c) enthält 4 Moleküle eines Dimeren. Ähnlich wie im dimeren Triphenylaluminium sind in jedem Molekül zwei Li-Atome durch zwei Phenyl-Gruppen verbrückt. Durch die Anlagerung eines Diamin-Liganden erreicht jedes Li-Atom vierfache Koordination.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110918
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  • 9
    Electronic Resource
    Electronic Resource
    Dioxotetradecakis(trimethylsiloxo)octadecakupfer(I), Cu18O2[OSi(CH3)3]14, ein silikon-analoges Oligomeres mit Kupfer als Heteroatom im silikatischen Grundgerüst (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3360-3366 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Dioxotetradecakis(trimethylsiloxo)octadecacopper(I), Cu18O2[OSi(CH3)3]14, a Silicon Analogous Oligomer with Copper as a Heteroatom in the Silicatic SkeletonThe title compound is formed by thermal decomposition of copper(I) trimethylsiloxide with elimination of hexamethyldisiloxane. Its structure has been determined by X-ray analysis (space group C 2/m, Z = 2) and refined to R = 0.079. The compound forms a large spherical molecule containing in its inner part eighteen Cu atoms connected by oxygen atoms. Its surface consists of fourteen trimethylsilyl groups.
    Notes: Die Titelverbindung entsteht aus Kupfer(I)-trimethylsiloxid durch thermische Abspaltung von Hexamethyldisiloxan. Ihre Struktur wurde röntgenographisch bestimmt (Raumgruppe C 2/m, Z = 2) und bis R = 0.079 verfeinert. Die Verbindung stellt ein voluminöses, kugelförmiges Molekül dar, das im inneren Teil achtzehn über Sauerstoff verbrückte Cu-Atome enthält. An der Oberfläche des Moleküls befinden sich vierzehn Trimethylsilylgruppen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781111010
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  • 10
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXXXIII: Darstellung und Reaktionen von zweikernigen Hydroxycarbenanhydrid-Komplexen des Chroms (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1120-1127 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition metal Carbene Complexes, LXXXIII: Synthesis and Reactions of Binuclear Hydroxycarbene Anhydride Chromium Complexes[Pentacarbonyl(hydroxyphenylcarbene)chromium]anhydride(1) reacts with dimethylamine to give pentacarbonyl[(dimethylamino)phenylcarbene]chromium(0) (2) and dimethylammoniumbenzoylpentacarbonylchromate (3). The acidic, p-phenyl-substituted (arylhydroxycarbene)pentacarbonyl chromium complexes (4,5) yield with dicyclohexylcarbodiimide (DCCD) by intermolecular water elimination binuclear (arylhydroxycarbene) pentacarbonylchromium anhydride complexes (6,7). The reaction of the anhydride complexes with tetraalkylammoniumhalides to give trans-(arylcarbyne) tetracarbonylhalogenochromium complexes and tetraalkylammoniumacylpentacarbonylchromates shows a strong in fluence of phenyl-substituents on the reactivity of the anhydride complexes.
    Notes: [Pentacarbonyl(hydroxyphenylcarben)chrom]-anhydrid (1) reagiert met Dimethylamin zu Pentacarbonyl[(dimethylamino)phenylcarben]chrom(0) (2) und Dimethylammonium-benzoylpentacarbonylchromat (3). Die aciden p-phenyl-substituierten (Arylhydroxycarben)pentacarbonylchrom-Komplexe (4,5) ergeben mit Dicyclohexylcarbodiimid (DCCD) unter intermolekularer Wasserabspaltung die zweikernigen [(Arylhydroxycarben) pentacarbonylchrom]-anhydrid-Komplexe (6,7). Die Umsetzung der Anhydridkomplexe mit Tetraalkylammonium-halogeniden, die zu trans-(Arylcarbin)tetracarbonylhalogenochrom-Komplexen und Tetraalkylammonium-acylpentacarbonylchromaten führt, zeigt einen starken Einfluß der Phenylsubstituenten auf die Reaktivität der Anhydridkomplexe.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090334
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