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  • Wiley-Blackwell  (101)
  • 1965-1969  (101)
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  • 1
    Digitale Medien
    Digitale Medien
    1,2,4- and 1,3,5-trivinylbenzenes. Vapor-phase chromatographic and nuclear magnetic resonance characterization (1967)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 5 (1967), S. 1805-1806 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: No Abstract
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1967.150050729
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  • 2
    Digitale Medien
    Digitale Medien
    Model compounds and polymers with quinoxaline units (1966)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 4 (1966), S. 2831-2842 
    Details
    ISSN: 0449-296X
    Schlagwort(e): Physics ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Tetra- and heptanuclear N-heterocycles, their dimers and their polymers have been prepared by condensation of o-phenylenediamine or 3,3'-diaminobenzidine with 2,3-dihydroxyquinoxaline, 2,3,2,3'-tetrahydroxy-6,6'-bisquinoxaline, or 2,3,7,8-tetrahydroxy-1,4,6,9-tetraazaanthracene in polyphosphoric acid, or with the O-phenyl derivatives of the latter three compounds in phenol. The condensation products are highly colored compounds with characteristic absorption spectra. The polymers show good thermal stability.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1966.150041109
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  • 3
    Digitale Medien
    Digitale Medien
    Conformational analysis of poly-N-methyl-L-alanine (1967)
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 815-820 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Sterically allowed forms of the poly-N-methyl-L-alanine chain were found by calculation of conformational energies as a function of the rotation angles of its chain bonds. The lowest energy form seems to be a right-handed, approximately threefold helix.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1967.360050904
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  • 4
    Digitale Medien
    Digitale Medien
    Molecular conformation of poly(S-lactic acid) (1968)
    New York : Wiley-Blackwell
    Biopolymers 6 (1968), S. 299-306 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The predominant role of van der Waal interactions in determining the helical conformations of a simple synthetic linear polymer, as well as helical polypeptides, was pointed out in systematic studies by Liquori et al.1,2. In the case of homopolypeptides the conformational analysis carried out on the basis of a simple semiempirical function describing the van der Waal pairwise interactions between the non directly bonded atoms lead to the conclusion that only five helices are allowed (Rα, β, γ, δ, Lα).2,3In view of the close similarities with poly-L-alanine, we have investigated by x-ray and conformational analysis the molecular conformation of poly(S-lactic acid) which has recently been described by Kleine and Kleine4 and Schuls and Schwaab5 and studied in solution by Goodman and D'Alagni.6 In fact, this polymer may be related to the polypeptide by the interchange of a peptide bond with ester bond along the main chain. This operation is expected to involve only a relatively small change in the steric interaction within the possible helical conformation, but obviously rules out any possibility of hydrogen bonding.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1968.360060305
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  • 5
    Digitale Medien
    Digitale Medien
    Darstellung und schwingungsspektroskopische Untersuchung der Konformation des BicyclobutylsTeil d. Dissertat. v. A. de Meijere, Univ. Göttingen 1966. (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 2155-2161 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Bicyclobutyl (4) entsteht sowohl bei der Umsetzung von Cyclobutylmagnesiumbromid mit Kupfer(II)-chlorid als auch bei der Behandlung von Tri-cyclobutyl-boran mit Silbernitrat in brauchbaren Ausbeuten. Aus dem Vergleich der IR-Spektren der flüssigen und der kristallinen Substanz ist zu schließen, daß in der Flüssigkeit mehrere Konformere des Moleküls im Gleichgewicht vorliegen, während im Kristall nur eine Form existiert. Eine Gegenüberstellung des IR-Kristallspektrums mit dem Raman-Spektrum der Flüssigkeit gibt Anhalt dafür, daß die im Kristall allein vorliegende Form des Moleküls zentrosymmetrisch ist.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19660990713
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  • 6
    Digitale Medien
    Digitale Medien
    Selenophosphororganische Verbindungen, II (1968)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 3070-3078 
    Details
    ISSN: 0009-2940
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Diphenylselenophosphinsäure-Se-phenylester (4) wird nach sechs neuen Methoden dargestellt. Der bisher unbekannte Triselenophosphorsäure-Se.Se.Se-triphenylester (8) läßt sich durch Umsetzung von Selenophenol mit PCl3 gewinnen. Die Selenophosphorsäure-O.O-dialkylester-Se-phenylester 10 erhält man aus Benzolselenylbromid mit Trialkylphosphiten 9 oder Dialkoxyphosphorylquecksilberchloriden 11.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/cber.19681010916
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  • 7
    Digitale Medien
    Digitale Medien
    A finite element method of viscoelastic stress analysis with application to rolling contact problems (1969)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 1 (1969), S. 379-394 
    Details
    ISSN: 0029-5981
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik , Technik allgemein
    Notizen: A completely numerical method for steady state linear viscoelastic stress analysis is presented by means of the finite element approach. Numerical representations of the measured viscoelastic constitutive relations are used. This method is developed to obtain steady state solutions to mixed boundary value problems in which the character of the boundary conditions at a point changes with time. Such problems cannot be handled by direct application of the correspondence theorem. A numerical example of viscoelastic sheet rolling is presented along with an experimental verification of the solution by photo-viscoelastic observations.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nme.1620010405
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  • 8
    Digitale Medien
    Digitale Medien
    On the mechanism of respiration in the bullfrog, Rana catesbeiana: A reassessmentSupported (in part) by National Science Foundation grant GB-6521X. Presented (in part) at the 150th Conference of the Society for Experimental Biology in Bristol, England, during March 1968, at the meeting of the American Society of Ichthyologists and Herpetologists at Ann Arbor, Michigan on 18 June 1968, and before the Society for the Study of Amphibians and Reptiles meeting at Mountain Lake, Virginia on 24 August 1968. (1969)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 127 (1969), S. 259-289 
    Details
    ISSN: 0362-2525
    Schlagwort(e): Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Medizin
    Notizen: The mechanism of respiration in the bullfrog has been analyzed by means of pressure recordings from the buccal cavity, the lungs and the abdominal cavity, by cinematography and cinefluorography, and by electromyography of buccal, laryngeal and abdominal muscles. Gas flow was investigated by putting frogs in atmospheres of changing argon and nitrogen content and monitoring the concentration of the nostril efflux.Three kinds of cyclical phenomena were found. (1) Oscillatory cycles consist of rhythmical raising and lowering of the floor of the mouth, with open nares. They have a definite respiratory function in introducing fresh air into the buccal cavity. (2) Ventilatory cycles involve opening and closing of the glottis and nares and renewal of a portion of the pulmonary gas. More muscles are involved and the pattern of muscular activity is more complex than in the oscillatory cycles. (3) Inflation cycles consist of a series of ventilation cycles, interrupted by an apneic pause. The intensity of the ventilatory cycles increases before this pause and decreases immediately thereafter. This results in a stepwise increase in pulmonary pressure, to a plateau (coincident with the pause) followed by a sudden or stepwise decrease.The respiratory mechanism depends on the activity of a buccal force pump, which determines pulmonary pressure whose level is always slightly less than the peak pressure values of the ventilation cycles. The elevated pulmonary pressure is responsible for the expulsion of pulmonary gas during the second phase of the next ventilation cycle. This pressure is maintained by the elastic fibers (and the smooth masculature) of the lungs.
    Zusätzliches Material: 16 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jmor.1051270302
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  • 9
    Digitale Medien
    Digitale Medien
    Water-formaldehyde-hydrogen sulfide system. II. Formation and growth of thiomethylenic chains.Prod. No. 1341 (1966)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 10 (1966), S. 859-864 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: A linear polymer with a high melting point is obtained from the water-formaldehyde-hydrogen sulfide system in the presence of sulfuric acid. This polymer is substantially formed by a polythiomethylene chain with a few oxymethylene units. Its formation involves a topochemical reaction of the mercaptomethanol present in solution on the first separation solid of the system. On heating, the polymer loses oxymethylene units; in the same way, the first solid product separated from the system loses formaldehyde and undergoes a morphological and chemical transformation to polythiomethylene.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1966.070100603
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  • 10
    Digitale Medien
    Digitale Medien
    Investigation by electron microscopy and x-ray diffraction of the microstructure of permselective membranes made from polyethylene (1967)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 909-919 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Ion-permselective membranes containing polyethylene in their base material have been examined by direct transmission electron micrography and x-ray diffraction. All of the electron micrographs showed white lines of about 100 A. thickness between somewhat thinner black lines composed of granules. These lines often occur as black-white-black triplets. We tentatively explain these structural elements by assuming that they are cross sections of the crystallite platelets, characteristic for polyethylene, reacted on both of their faces during sulfochlorination. It is known, that these platelets are about 100 A. thick, X-ray diffraction experiments also showed the characteristic lines of polyethylene crystallites, their intensity decreasing after sulfonation. The velocity of heterogeneous sulfochlorination of polyethylene sheets decreases abruptly when the film contains 6% S and 7% Cl (after hydrolysis). This m̰eans six substituted sites on a chain element across the platelet for a 100% crystalline film and accordingly less for a partially amorphous material. It is known that five CH2 groups of each chain element are exposed at the surface of the platelets, in good agreement with our findings.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1967.070110611
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