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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 87 (1965), S. 391-392 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Inorganic chemistry 6 (1967), S. 1931-1933 
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 566-567 
    ISSN: 1399-0047
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Glyceraldehyde-3-phosphate dehydrogenase from spinach chloroplasts has been crystallized by vapour diffusion in the pH range 7–8.5 in (NH4)2SO4 and Tris–HCl buffer or potassium phosphate buffer at room temperature. Crystals of the A4 isoform, grown at pH 8.5 in Tris–HCl buffer, diffract to 3.0 Å (at 100 K) using synchrotron radiation. The crystals belong to the orthorhombic C222 space group, with unit-cell dimensions a = 145.9, b = 185.9 and c = 106.3 Å, and probably contain one tetramer per asymmetric unit. Structure determination by molecular replacement is in progress.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: X-ray diffraction techniques have been used to investigate the orientation under stress of collagen fibres in pig's descending aortic wall. The variation of the limit value of the incremental modulus as a function of the collagen content seems to suggest that the extra amount of collagen going from the aortic arch downwards is deposited in a preferred orientation corresponding to the circumferential direction. The results have been used to describe the uniaxial mechanical behaviour of this tissue taking into account its composite structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 154 (1972), S. 271-277 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde das Koordinationspolymere von Zink(II) mit dem diastereoisomeren Gemisch der Bis-(1-methyl-butyl)-phosphinsäure (Zn{[(CH3)(n-C3H7)CH]2PO2}2)n dargestellt und seine Kettenstruktur mit Hilfe von Röntgenbeugungsaufnahmen untersucht. Aus den Streudiagrammen von verstreckten Fasern wurde eine Identitätsperiode längs der Faserachse von 9,16 Å ermittelt. Die Reflexe können unter der Annahme einer hexagonalen Packung der Ketten indiziert werden.Der Vergleich der gemessenen Reflexintensitäten mit der für die Schichtlinien berechneten Intensitätsverteilung zeigt, daß das Zink(II)-bis-(1-methyl-butyl)-phosphinat eine Hauptvalenzkette mit doppelten Phosphinatbrücken zwischen tetraedrischen Metallatomen besitzt, während eine Struktur mit alternierenden einfachen und dreifachen Phosphinatbrücken gefunden wurde, wenn die organischen Seitenketten aus Phenyl- oder linearen Alkylgruppen bestehen. Dies wird durch Behinderung bei der Bildung von räumlichen Dreifach-Brücken durch sterische Wechselwirkungen zwischen den Alkylgruppen erklärt.
    Notes: The coordination polymer of zinc(II) with the diastereoisomeric mixture of bis-(1-methyl-butyl)-phosphinic acid, (Zn{[(CH3)(n-C3H7)CH]2PO2}2)n, has been prepared and its chain structure has been investigated by X-ray diffraction. The identity period along the fibre axis determined from the X-ray diffraction photographs of drawn fibres is 9.16 Å. The reflections can be indexed on the basis of a hexagonal packing of chains.Comparison between observed intensities and the calculated intensity distribution on the layer lines of the X-ray pattern shows that zinc(II) bis-(1-methyl-butyl)-phosphinate, has a backbone structure with double phosphinate bridges between tetrahedral metal atoms instead of a structure with alternating single and triple phosphinate bridges as found when the organic side chains are phenyl or linear alkyl groups. This is accounted for by restrictions on the formation of the triple bridged cages due to the steric interactions between the branched alkyl groups.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1807-1814 
    ISSN: 0947-6539
    Keywords: aragonite ; biomineralization ; calcite ; crystal growth ; peptides ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crosslinked gelatin films with entrapped poly-L-aspartate were used to induce the crystallization of calcite and aragonite polymorphs. Calcite with high degrees of isomorphous substitution (up to 12mol% magnesium) has been obtained. The morphology and layered organization of magnesium calcite crystals grown inside the crosslinked gelatin films with entrapped poly-L-aspartate resemble some structural features of radial calcitic ooids. The concentration of entrapped poly-L-aspartate and the uniaxial deformation of the films control the growth of aragonite aggregates inside the films. Such aggregates grown inside uniaxially deformed films consist of parallel rods with an architectural assembly similar to that found in some marine organisms. The crystals' aggregation and the control of calcium carbonate polymorphism are related to the modelling of the nucleation sites by poly-L-aspartate structure and concentration, local supersaturation and microenvironment shape. The results indicate that the collagenous matrices with entrapped polyelectrolytes are versatile systems which can contribute to the elucidation of strategies for biomimetic materials chemistry.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 120 (1968), S. 96-102 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Über die Ergebnisse aus den Röntgen-Faser-Diagrammen von dem Copolymeren \documentclass{article}\pagestyle{empty}\begin{document}$$ \left\{ {{\rm Be}\left[ {\left( {n - {\rm C}_4 {\rm H}_9 } \right){\rm PO}_2 } \right]_{2 - 2{\rm X}} \left[ {\left( {{\rm C}_6 {\rm H}_5 } \right)_2 {\rm PO}_2 } \right]_{2{\rm X}} } \right\}_{\rm n} \quad \left( {{\rm X} = 0.20} \right), $$\end{document} isomorph mit den Homopolymeren \documentclass{article}\pagestyle{empty}\begin{document}$$ \left\{ {{\rm Be}\left[ {\left( {n - {\rm C}_4 {\rm H}_9 } \right){\rm PO}_2 } \right]_2 }_{\rm 2} \right\}_{{\rm n,}} $$\end{document} wird berichtet. Die Gitterzelle ist monoklin mit \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm a} = 17.6 \pm 0.1{\rm \AA};\;{\rm b} = 9.17 \pm 0.8{\rm \AA}\left( {{\rm fiber \ \rm axis}} \right);\;{\rm c} = 14.0 \pm 0.1{\rm \AA};\quad {\rm \beta } = 108.5^\circ \pm 1^\circ .$$\end{document}Die Kettenmoleküle bilden eine Hauptkettenstruktur mit tetraedrisch angeordneten Metallatomen, abwechselnd von Phosphinat-Gruppen mit Einfach- und Dreifachbrücken ancinander gekoppelt. Die Raumgruppe P21/m gab die beste Übereinstimmung mit den beobachteten Intensitäten. Die Kettenmoleküle sind alternierend um b/2 gegeneinander verschoben, so daß die käfigförmigen Phosphinatgruppen mit Dreifachbrücken einer Kette in dem Zwischenraum zwischen denjenigen der Nachbarkette liegen, ähnlich wie bei der β-Form von \documentclass{article}\pagestyle{empty}\begin{document}$$ \left\{ {{\rm Zn}\left[ {\left( {n - {\rm C}_4 {\rm H}_9 } \right)_{\rm 2} {\rm PO}_2 } \right]_2 } \right\}_{{\rm n}{\rm .}}$$\end{document}.
    Notes: The results of the interpretation of the X-ray fibre photograph of the copolymer \documentclass{article}\pagestyle{empty}\begin{document}$$ \left\{ {{\rm Be}\left[ {\left( {n - {\rm C}_4 {\rm H}_9 } \right){\rm PO}_2 } \right]_{2 - 2{\rm X}} \left[ {\left( {{\rm C}_6 {\rm H}_5 } \right)_2 {\rm PO}_2 } \right]_{2{\rm X}} } \right\}_{\rm n} \quad \left( {{\rm X} = 0.20} \right), $$\end{document} isomorphous with the homopolymer \documentclass{article}\pagestyle{empty}\begin{document}$$ \left\{ {{\rm Be}\left[ {\left( {n - {\rm C}_4 {\rm H}_9 } \right){\rm PO}_2 } \right]_2 } \right\}_{{\rm n,}} $$\end{document} are reported. The unit cell has a monoclinic symmetry with \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm a} = 17.6 \pm 0.1{\rm \AA};\;{\rm b} = 9.17 \pm 0.8{\rm \AA}\left( {{\rm fiber \ \rm axis}} \right);\;{\rm c} = 14.0 \pm 0.1{\rm \AA};\quad {\rm \beta } = 108.5^\circ \pm 1^\circ . $$\end{document}.The molecular chains are characterized by a backbone strucure with tetrahedral metal atoms bonded by alternate single and triple bridging phosphinate groups. The best agreement between observed and calculated intensities was obtained assuming the space group P21/m. Pairs of parallel chains are packed so that the triple bridged cages of one chain fall midway those of the other chain in a way similar to that found in the β-form of the polymer \documentclass{article}\pagestyle{empty}\begin{document}$$ \left\{ {{\rm Zn}\left[ {\left( {n - {\rm C}_4 {\rm H}_9 } \right)_{\rm 2} {\rm PO}_2 } \right]_2 } \right\}_{{\rm n}{\rm .}} $$\end{document}
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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