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  • 1
    Electronic Resource
    Electronic Resource
    Ligand orientation and haem electronic structure in ferricytochrome c′′ from Methylophilus methylotrophus studied by 13C NMR (1996)
    Springer
    European biophysics journal 25 (1996), S. 19-24 
    Details
    ISSN: 1432-1017
    Keywords: Key words Cytochrome c′′ ; Ligand orientation ; Methylophilus methylotrophus ; 13C NMR ; Heme electronic structure ; Fermi contact shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Cytochrome c′′ from Methylophilus methylotrophus contains a single haem with bis-histidine coordination which couples electron and proton transfer by reversible detachment of one of the axial ligands on reduction. 13C NMR of the haem substituents is now used to determine the orientations of the two histidine ligands of the ferricytochrome. The relative orientation of the ligands is found to be nearly perpendicular (an angle of 85±2° between the histidine planes was obtained), which is consistent with the near-axial g-tensor determined by EPR. Although the absolute orientation of the axial ligands is not well defined in the presence of near-axial symmetry, 13C NMR is found to be a useful complement to EPR for obtaining quantitative information for systems of this type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050011
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  • 2
    Electronic Resource
    Electronic Resource
    Bestimmung von Ionisationspotentialen aus der Photoelektronen-Energie (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 75 (1963), S. 1033-1034 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19630752141
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  • 3
    Electronic Resource
    Electronic Resource
    Depression of the glass transition temperature of poly(methyl methacrylate) by plasticizers: Conformity with free volume theory (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 1971-1979 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Mixtures of poly(methyl methacrylate) (PMMA) and plasticizer were made by γ-irradiation of mixtures of methyl methacrylate with diethyl phthalate or with dioctyl phthalate. The glass transition temperature Tg was determined by differential scanning calorimetry. Plots of Tg versus volume fraction of PMMA were found to conform to the simple free volume theory of Kelley and Bueche, using physical property values either reported in the literature or else calculated by Bondi's procedures.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1987.090250915
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  • 4
    Electronic Resource
    Electronic Resource
    Radiation crosslinking of rubber. IV. Ultraviolet and infrared absorption spectra (1959)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 2 (1959), S. 340-344 
    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: When purified rubber is exposed in vacuo to high energy radiation, very few conjugated triene groups are formed relative to the number of molecules of hydrogen evolved. This indicates that less than 4% of the hydrogen is evolved from adjacent carbon atoms in the same molecule, a reaction which would have no immediate crosslinking potential. Rather more conjugated diene groups have been detected, but when these are compared together with triene groups relative to the yield of chemical crosslinks it can be calculated that less than 10% of the allylic radical precursors disproportionate. Infrared absorption spectra do not indicate the marked decrease in unsaturation reported by some previous workers. Slight changes in the infared spectra may indicate some cis-trans isomerization. There is qualitative evidence for a small increase in vinylidene unsaturation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1959.070020615
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  • 5
    Electronic Resource
    Electronic Resource
    The distribution of polymethyl methacrylate formed in natural rubber latex: An electron microscopical study (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 3 (1960), S. 366-367 
    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: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1960.070030916
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  • 6
    Electronic Resource
    Electronic Resource
    Glass transition of polymers made from slurries of poly(ethyl methacrylate) and methyl methacrylate (1988)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 26 (1988), S. 1795-1799 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1988.090260818
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of crosslinking on the tensile strength and fractography of poly(methyl methacrylate) (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 95-98 
    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: Glassy crosslinked networks were prepared by copolymerization of methyl methacrylate with up to 4.7 mole-percent ethylene dimethacrylate. These networks were degraded by exposure to γ-rays and the solubilized fraction estimated by benzene extraction using the analysis of A. R. Schultz. The efficiency of the Crosslinking agent was found to be 0.5 and this value was used to calculate the molecular weight between crosslinks. The molecular weight of the primary molecules in the network, M, was estimatfrom the radiation dose using the known fact that one fracture requires an energy deposition of 59 ev. Crosslinking was found to have little influence on the tensile strength of networks of primary molecular weight 〉 105. In contrast. crosslinking raised, the strength of polymers of M 〈 105 to, a value approaching that of a high molecular weight linear polymer (ca. 70MN/m2). Crosslinking was found to have only a small influence on the gross morphology of fracture surfaces.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760190207
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  • 8
    Electronic Resource
    Electronic Resource
    Influence of a plasticizer on water sorption by polymethyl methacrylate (1987)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 25 (1987), S. 697-698 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1987.090250318
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  • 9
    Electronic Resource
    Electronic Resource
    Entangled mixtures of poly(methacrylates) made from polymer-monomer slurries (1989)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 27 (1989), S. 1557-1561 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1989.090270716
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  • 10
    Electronic Resource
    Electronic Resource
    Strength and structure of glassy networks formed from dimethacrylates (1982)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 22 (1982), S. 438-443 
    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: Glassy networks were formed by copolymerization of methyl methacrylate (MMA) with both ethylene glycol dimethacrylate (EGDM) and triethylene glycol dimethacrylate (TGDM). The polymerization reaction was followed by estimation of vinyl group concentration from measurements of specific volume and infrared absorption. The sheets of polymer were cracked but gave fragments that were large enough to provide specimens suitable for a three-point bending test. Flexural strength decreased with increasing feed of dimethacrylate but, nevertheless, gave fairly strong products throughout the range of comonomer compositions c.f. PMMA, 144 ± 9 MPa; PTGDM, 132 ± 10 MPa; PEGDM, 66 ± 15 MPa. Examination of fracture surfaces indicated a predominantly brittle mode of fracture modulated by localized plastic deformation. In order to account for localized plastic deformation, it was postulated that the networks consist of highly crosslinked microgel particles in a much less crosslinked matrix.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760220708
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