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  • Articles  (836)
  • Wiley  (593)
  • Wiley-Blackwell  (123)
  • American Association for the Advancement of Science (AAAS)  (120)
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  • 1
    Electronic Resource
    Electronic Resource
    Strategien zum Aufbau molekularer und polymerer Kohlenstoffallotrope (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 104 (1992), S. 1123-1146 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Das Leben auf der Erde beruht auf Verbindungen mit einem Kohlenstoffgerüst. Bis zum heutigen Tage haben Chemiker die Welt der Biomoleküle und Biopolymere um etwa 107 verschiedene synthetische Moleküle und Polymere erweitert, deren Struktur ebenfalls von der Bildung stabiler C—C-Bindungen abhängt. Obwohl die Stabilität von C—C-Bindungen seit über hundert Jahren wohlbekannt ist, waren Graphit und Diamant bis vor kurzem die einzigen auf der Erde in makroskopischen Mengen verfügbaren und strukturell charakterisierten Kohlenstoffallotrope. Mit der Darstellung makroskopischer Mengen an Buckminsterfulleren C60 und an höheren Fullerenen wie C70, C76, und C78 sowie der Erforschung der faszinierenden Eigenschaften dieser Kohlenstoffkugeln hat sich diese Situation inzwischen drastisch geändert. Im Laufe der kommenden Jahrzehnte wird der Entwurf, die Darstellung und das Studium neuer molekularer und polymerer allotroper Formen des Kohlenstoffs eine zentrale Stellung in der Chemie einnehmen. Dies wird zu einer wesentlichen Vertiefung unserer grundlegenden Kenntnisse über die aus Kohlenstoff aufgebaute Materie führen und  -  wie die aktuelle C60-Forschung zeigt  -  völlig neue Perspektiven für technologische Entwicklungen bieten. Dieser Artikel gibt eine übersicht über organisch-chemische Synthesestrategien für ausschließlich aus Kohlenstoff aufgebaute Moleküle und Polymere, welche strukturell von den bekannten Graphit- und Diamant-Netzwerken und auch von den Fullerenen abweichen. Wir diskutieren auch die aktuelle Fullerenforschung, wobei wir besonderes Gewicht auf die Synthesestrategien legen wollen, welche zu den Fullerenen sowie deren übergangsmetallkomplexen führen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19921040904
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  • 2
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    Environmental dynamics and formation processes of the archaeological record in Latin America (2017)
    Wiley
    Details
    Publication Date: 2017-10-03
    Print ISSN: 0883-6353
    Electronic ISSN: 1520-6548
    Topics: Archaeology , Geosciences
    Published by Wiley
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  • 3
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    Circumscribed sclerosing hemangiomas of the lung appearing as “coin” lesions (1958)
    Wiley
    Details
    Publication Date: 1958-07-01
    Print ISSN: 0008-543X
    Electronic ISSN: 1097-0142
    Topics: Biology , Medicine
    Published by Wiley on behalf of American Cancer Society.
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  • 4
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    Pressure regulates osteoclast formation and MCSF expression in marrow culture (1997)
    Wiley
    Details
    Publication Date: 1997-01-01
    Print ISSN: 0021-9541
    Electronic ISSN: 1097-4652
    Topics: Biology , Medicine
    Published by Wiley
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  • 5
    Electronic Resource
    Electronic Resource
    An investigation of the involvement of cytoskeletal structures and secretion in gliding motility of the marine diatom, Amphora coffeaeformis (1985)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 5 (1985), S. 103-122 
    Details
    ISSN: 0886-1544
    Keywords: gliding ; cell motility ; cytoskeleton ; diatoms ; capping ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Gliding motility was investigated in the marine diatom, Amphora coffeaeformis. Ultrastructural, biochemical, and pharmacological protocols were employed to probe the possible involvement of cytoskeletal proteins and a secretory process in gliding motility. Motility rate was measured using a video recording apparatus, and the effects of various cytoskeleton-disrupting drugs on motility were tested. Cytochalasins D and E, podophyllotoxin, and vinblastine (all at 25 μUg/ml) reversibly inhibited motility, as did monensin (10 μUM) and pronase (25 μUg/ml). Biochemical protein analysis of whole-cell extracts by one- and two-dimensional polyacrylamide gel electrophoresis revealed polypeptides comigrating with rabbit skeletal muscle actin and bovine brain tubulin; however, specific assays used to separate actin from whole-cell preparations gave ambiguous results. Ultrastructural studies revealed the presence of extracellular material between the raphe canal and the substratum in motile cultures. An assay was devised for the detection of radioactively labeled material (MW 〉 1800 Daltons) released by motile cultures into the culture medium. When cultures were treated with either an anticytoskeletal drug or monensin, motility was inhibited while the amount of measured radioactivity increased over solvent-treated control groups. The results from this study indicate possible roles for both actin- and tubulin-based structures in gliding motility of Amphora. Though secretion may be necessary for gliding to occur, its exact relationship to motility was not deduced. The data obtained in this study are compatible with a theory for the mechanism of gliding which involves the surface translocation of externally exposed membrane proteins against an immobile matrix of substratum-attached secreted material to generate the force required for movement.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970050204
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  • 6
    Electronic Resource
    Electronic Resource
    Formation of [M + 14] anions from fluorene: Negative ion CI studies using GC/MS, MS/MS and FTMS (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 14 (1987), S. 395-399 
    Details
    ISSN: 0887-6134
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Under negative ion chemical ionization conditions, fluorene yields an anion at [M + 14] mass units. This species has been determined to correspond to [M + O - 2H]-, with the loss of two hydrogen atoms at the C-9 position and addition of oxygen to form a structure similar to 9-fluorenone.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200140807
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  • 7
    Electronic Resource
    Electronic Resource
    Viscosities of ethylene-propylene-diene terpolymer blends in oil (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 49 (1993), S. 111-115 
    Details
    ISSN: 0021-8995
    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
    Notes: Viscosities were obtained on oil solutions of two ethylene-propylene-diene terpolymers (EPDMs) and their blends. For the amorphous terpolymer with 59 mol% ethylene, intrinsic viscosities were constant between-10 and 40°C. The viscosities decreased rapidly at low temperature for blends of this material with as little as 20 wt % of a slightly crystalline EPDM with 79 mol% ethylene. Dynamic viscosity measurements on 1.0% solutions of blends likewise gave considerably smaller values at low temperature than measurements on an amorphous EPDM of similar molecular weight. The data are in agreement with the view that longer ethylene sequences that crystallize in the bulk polymer can organize in oil into ordered domains that interfere less with flow than the disordered amorphous polymer regions. © 1993 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070490113
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of polymeric structure on the permeation rate in standard reference material sulfur dioxide permeation tubes (1975)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 15 (1975), S. 11-15 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    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
    Notes: Liquid SO2 sealed into tubes made of a fluorocarbon copolymer permeates the walls of the tube at a temperature-dependent but accurately reproducible rate. Sulfur dioxide dispensers made in this way are called permeation tubes and are useful for calibrating instruments that measure SO2 concentrations in air. The National Bureau of Standards calibrates SO2 permeation tubes and makes them available as Standard Reference Materials. The permeation rate in a batch of nominally identical tubes varies enough that each Standard Reference Material tube must be individually calibrated. Changes in the length or radial dimensions of the tubes are much too small to explain most of this variation. An excellent (negative) correlation is found between the measured permeation rate and the density of the polymer (or weight per unit length). Since both the measured density and the permeation rate for this semi-crystalline polymer depend upon morphological factors, but in different ways, x-ray diffraction measurements of the thickness and orientation of the lamellar crystals were made and a mathematical model was set up to identify the morphological factors which can cause variations in the permeation rate.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760150103
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  • 9
    Electronic Resource
    Electronic Resource
    Interrupted stress-strain experiments of nylon 6 (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 1565-1572 
    Details
    ISSN: 0021-8995
    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: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160623
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  • 10
    Electronic Resource
    Electronic Resource
    Organic Approaches to Endohedral Metallofullerenes: Cracking Open or Zipping Up Carbon Shells? (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1009-1016 
    Details
    ISSN: 0947-6539
    Keywords: alkynes ; cobalt ; endohedral metallofullerenes ; fullerenes ; macrocycles ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have been investigating the synthesis of endohedral metallofullerenes since we successfully opened an orifice on the framework of C60 in the form of a cobalt complex having the metal sitting on top of the opening. A second approach aims at the synthesis of spherically-shaped acetylenic macrocycles, which are expected to rearrange to endohedral metal complexes of fullerenes in a controlled process analogous to the gas-phase coalescence of mono- and polycyclic polyynes during fullerene formation by the graphite evaporation method. Since the potential benefits from obtaining endohedral metal complexes of C60 are enormous, both approaches are being actively pursued in our group.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970030705
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