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  • Geophysics  (10)
  • Polymer and Materials Science  (10)
  • Astronomy  (6)
  • Cell & Developmental Biology  (5)
  • Environment  (5)
  • Nuclear Reactions  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Oligosaccharide heterogeneity of glycoproteins sulfated during the vegetative growth of Dictyostelium discoideum (1988)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 38 (1988), S. 77-86 
    Details
    ISSN: 0730-2312
    Keywords: macromolecule sulfation ; Oligosaccharide structures ; life cycle ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Macromolecules are sulfated during the vegetative growth of Dictyostelium discoideum. A characterisation of the structures of sulfated oligosaccharides associated with these macromolecules indicates that the oligosaccharides are heterogeneous. Endoglycosidase and pronase digestion were used with gel-filtration chromatography to obtain two different Oligosaccharide fractions and a glycopeptide fraction; these were further characterised by ion-exchange and lectin-affinity chromatography and by acid hydrolysis. The data indicate that up to 43% of the sulfate is associated with typical N-linked oligosaccharides, that up to 5% is associated with N-linked oligosaccharides that are either very large or extremely highly charged, and that the remaining sulfate is associated with oligosaccharides non-N-linked to protein. Each fraction was also shown to be heterogeneous at most other structural levels. Electrophoretic analyses following the endoglycosidasc and pronase treatments indicated that all of the macromolecules are glycoproteins and suggested further that at least two of the Oligosaccharide fractions are located on different groups of glycoproteins.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240380202
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  • 2
    Electronic Resource
    Electronic Resource
    An immunological assessment of lysosomal enzymes and other macromolecules sulfated during vegetative growth of Dictyostelium discoideum (1988)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 38 (1988), S. 113-116 
    Details
    ISSN: 0730-2312
    Keywords: sulfated macromolecules ; slime moulds ; N-acetylglucosaminidase ; alpha-mannosidase ; beta-glucosidase ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Western blotting and immunoprecipitation data indicated that lysosomal enzymes represent a subset of the sulfated macromolecules present in vegetative Dictyostelium discoideum amoebae and account for less than 2.5% of the total sulfate incorporated during vegetative growth. These data suggest that the majority of the highly sulfated macromolecules of vegetative D. discoideum amoebae are not related to the lysosomal enzymes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240380205
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  • 3
    Electronic Resource
    Electronic Resource
    A convenient route to poly(methylphenylsilane)-graft-polystyrene copolymers (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Chemistry and Physics 198 (1997), S. 3571-3579 
    Details
    ISSN: 1022-1352
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A graft copolymer of polystyrene on poly(methylphenylsilylene) was conveniently synthesised by using the bromomethyl groups of bromomethylated poly(methylphenylsilylene) as initiating sites for the bulk polymerisation of styrene by an atom transfer radical mechanism.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1997.021981120
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of soft-segment CH2/O ratio on morphology and properties of a series of polyurethane elastomers (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 557-571 
    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: A series of six thermoplastic polyurethane elastomers were synthesized from a 4,4′-methylene diphenyl diisocyanate (MDI) and 1,4-butanediol (BDO) chain extender, with poly(ethyleneoxide) (PEO), poly(tetramethylene oxide) (PTMO), poly(hexamethylene oxide) (PHMO), poly(octamethylene oxide) (POMO), poly(decamethylene oxide) (PDMO), and poly(1,6-hexyl carbonate)diol (PCDO) macrodiol soft segments. The soft-segment molecular weights employed were similar (approximately 1000 g/mol) and each polyurethane contained 55% (w/w) of the soft-segment macrodiol. Differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), wide-angle X-ray diffraction (WAXD), and Fourier transform infrared spectroscopy (FTIR) techniques were employed to characterize the morphology. Tensile and Shore hardness tests were also performed. Materials were tested in the as-molded, solvent-cast, and annealed states. It was found that the polyurethanes produced from macrodiols with the highest CH2/O ratio displayed greater hard-domain crystallinity, a higher degree of phase separation, and the greatest hardness, stiffness, and opacity. POMO- and PDMO-based polymers displayed evidence of paracrystallinity in the soft domains. The PCDO-based material displayed a higher degree of phase mixing compared to the polyether-based materials. Annealing increased hard-domain crystallinity in all the polyether-based materials. The solvent-cast POMO- and PDMO-based materials had poor mechanical properties and were difficult to cast. The materials containing macrodiols with the lowest CH2/O ratio were more readily solvent-cost and produced strong, useful films. Morphologies of the solvent-cast materials differed greatly from those of the molded materials. © 1996 John Wiley & Sons, Inc.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Quadratic electro-optic non-linearity of a conjugated porphyrin polymer measured in the Q-band one-photon resonance region (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 4 (1994), S. 277-283 
    Details
    ISSN: 1057-9257
    Keywords: Porphyrin polymer ; Non-linear optics ; Quadratic electro-optic effect π-Conjugation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: We reprot linear and non-liner optical experiments on a new edge-linked porphyrin polymer that is soluble in pyridine/chlorinated solvent mixtures and that produces optical quality thin films by spin coating. This linear absorption properties of the polymer indicate that it posseses an extended intermacrocycle π-conjugation. This results in a strong red shift of the macrocycle-derived Q-band with the polymer peak at 874 nm (1.42 eV) in solution and 838 nm (1.48 eV) in solid films compared with a monomer solution peak at 642 nm (1.93 eV). The polymer possesses a large Stark-shift-related DC Kerr electro-optic non-linearity with peak responses in the real and imaginary part of X(3) (-ω; 0, 0, ω) of ReX(3) = -7.2 × 10 -8 esu at 849 nm (1.46 eV) and lmX(3) = 6.7 × 10-8 esu at 855 nm (1.45 eV). This response is 3-10 tiems larger that that reported for quasi-one-dimesional conjugated polymers and enhancements can be anticipated. Detailed examination of the electro-optic response spectra shows several interesting features which indicated that the usual phenomenological models of molecular Stark shifts do not provide a full description of the abserved behaviour. Future studies are planned to look more closely at the nature of the electro-optic response.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860040407
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of styrene-isoprene A2B2 hetero-armed star copolymersDedicated to Professor Maurice Morton to commemorate the establishment of the Maurice Morton Institute of Polymer Science at the University of Akron. (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 33 (1994), S. 123-128 
    Details
    ISSN: 0959-8103
    Keywords: star copolymers ; styrene ; isoprene ; anionic polymerisation ; 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: Styrene-isoprene A2B2 star copolymers having two arms of polystyrene and two of polyisoprene have been synthesised. Two routes have been followed. In the first, 2 moles of polydienyl lithium were coupled, without loss of carbanionic character, by reacting with 1 mole of 1,3-bis(1-phenylethenyl) benzene. The difunctional adduct was then used to initiate the polymerisation of styrene in the presence of a small amount of triethylamine which served to ensure a rapid crossover. In the second route, 2 moles of polystyrl lithium were coupled with 1 mol of SiCl4 in benzene; no attendant formation of three-armed star was detected. Introduction of large excess of polyisoprenyl lithium, together with triethylamine as catalyst, generated the star which was isolated by fractional precipitation.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pi.1994.210330202
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  • 7
    Electronic Resource
    Electronic Resource
    Direct observation of the stacked structure in substituted copper phthalocyanine LB films with STM (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 5 (1995), S. 259-263 
    Details
    ISSN: 1057-9257
    Keywords: scanning tunnelling microscopy ; Langmuir-Blodgett films ; substituted phthalocyanines ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The in-plane molecular structures of octa-alkyl substituted copper phthalocyanine LB films deposited on graphite have been resolved with a scanning tunnelling microscope (STM). The face-to-face stacking of Pc macrocycles has been observed in the topographies of R8PcCu monolayers. The stacking period was found to be 3.8-4 Å and the molecular rows were separated by 19 Å and 16 A for (C6H13)PcCu and (C5H11)PcCu respectively.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860050503
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  • 8
    Electronic Resource
    Electronic Resource
    Anatomical evidence for the presence of glutamate or enkephalin in noradrenergic projection neurons of the locus coeruleus (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Microscopy Research and Technique 29 (1994), S. 219-225 
    Details
    ISSN: 1059-910X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1070290307
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  • 9
    Electronic Resource
    Electronic Resource
    Polyurethane elastomers based on novel polyether macrodiols and MDI: Synthesis, mechanical properties, and resistance to hydrolysis and oxidation (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 46 (1992), S. 319-328 
    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: Novel polyurethane elastomers based on 4,4′-diphenylmethanediisocyanate, 1,4-butanediol, and polyether macrodiols that have 6, 8, or 10 methylene groups between the ether oxygens were prepared by two-step solution polymerization. Their mechanical properties and degradation resistance were compared with poly(tetramethylene oxide)-based polyurethanes. The new polyurethanes were more resistant to hydrolysis and to hydrogen peroxide-induced oxidation than were the poly(tetramethylene oxide) -based materials. The poly(octamethylene oxide) -based polyurethane displayed good resistance to sodium hypochlorite. 1,2-Diaminoethane chain-extended polyurethane-ureas were also prepared using the macrodiols poly(hexamethylene oxide) and poly(octamethylene oxide). They were not thermally processable or solvent-castable. Bulk synthesis of novel polyether polyurethanes yielded, in some cases, materials with improved mechanical properties compared with their solution-polymerized counterparts. The outcome of the bulk syntheses was highly dependent, however, on reaction conditions and stoichiometry.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070460213
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  • 10
    Electronic Resource
    Electronic Resource
    Novel polyetherurethaneurea elastomers based on α,α,α′,α′-tetramethyl-m-xylenediisocyanate: Synthesis, characterization, processability, and hydrolytic stability (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 47 (1993), S. 199-210 
    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: A series of novel polyetherurethaneurea elastomers based on m-TMXDI, polyether macrodiols containing 4, 6, 8, or 10 methylene groups between the ether linkages, and aliphatic and aromatic diamines was prepared by two-step solution polymerization. All the materials were thermally processable at 120-160°C except one that was solvent-castable. Mechanical properties and hydrolytic stability (at neutral pH) were found to depend on the macrodiol and chain extender. Poly(tetramethylene oxide)-based polyetherurethaneureas that were chain-extended with primary aliphatic diamines, other than 1,3-propanediamine, exhibited significantly better mechanical properties than those chain-extended with secondary aliphatic or aromatic diamines. The mechanical properties and hydrolytic stability of polyetherurethaneureas containing poly(hexa-, octa-, or decamethylene oxide) and 1,6-hexamethylenediamine were considerably better than those containing 1,2-ethylenediamine. The hydrolytic stability increased with the increasing C/O ratio of the macrodiol. With poly(hexamethylene oxide)-based materials, the phase separation between soft and hard domains was higher than that of the other materials as determined by DSC. © 1993 John Wiley & Sons, Inc.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1993.070470202
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