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  • Chemistry  (32)
  • General Chemistry  (7)
  • 78.20.Dj
  • Uricase cytochemistry
  • 1995-1999  (17)
  • 1985-1989  (18)
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Keywords
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Characterisation of TiN films prepared by electron shower, arc ion-plating and sputtering methods (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 5 (1995), S. 191-198 
    Details
    ISSN: 1057-9257
    Keywords: TiN ; adhesion ; PVD ; electron shower ; arc ion plating ; sputtering ; wear ; surface ; morphology ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: It has been found that TiN films with high wear resistance and high adhesion can be prepared by electron shower deposition and arc ion plating on glass and austenitic stainless steel (SUS 316) substrates. The high wear resistance is principally explained by the grain size and surface morphology. Fine {100}-faceted crystals (10-150 nm) grew on the surface. The typical morphology of the crystals was triangular pyramidal. The crystallite size was changed by the bias voltage. Faceted crystals produced by arc ion plating were rounded and smoothed by a change in bias, but were unaltered in samples prepared by the electron shower process. The fine faceted surfaces had higher wear resistance than the granularly rounded ones. When TiO2 was formed at the interface of the glass substrate, the adhesion was lowered. The high-adhesion film prepared by electron shower deposition contained a small amount of TiO2 at the interface.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/amo.860050403
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  • 2
    Electronic Resource
    Electronic Resource
    Reduction of optical absorption at a wavelength of around 0.8 μm in LPE garnet (TmBiCa)3(FeGaPt)5O12 (1985)
    Springer
    Applied physics 38 (1985), S. 281-284 
    Details
    ISSN: 1432-0630
    Keywords: 78.20.Dj ; 68.55.+b ; 78.20.Ls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Liquid-phase epitaxy (LPE) garnet films (TmBiCa)3(FeGaPt)5O12 have been grown using only Bi2O3 as the flux so that the film containing Bi gives high specific Faraday rotation. The film does not contain Pb, which may affect optical absorption. The optical absorption coefficientα at 810 nm has been effectively reduced by doping Ca in the melt. Our data show that a minimum level ofα and of the anisotropy constantK u and also the maximum of the electrical resistivityϱ are achieved when Ca2+ replaces Fe2+. Fe2+ results from Pt4+ incorporation in the film due to a Bi2O3 flux attack on a Pt crucible. Using a compensated film,α of 58 cm−1 and a figure of merit of 9deg/dB were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616064
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  • 3
    Electronic Resource
    Electronic Resource
    Cytochemical localization of uricase and catalase in developing root nodules of soybean (1987)
    Springer
    Protoplasma 140 (1987), S. 1-12 
    Details
    ISSN: 1615-6102
    Keywords: Cerium chloride ; Diaminobenzidine (DAB) ; Peroxisomes ; Root-nodules ; Soybean ; Uricase cytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Two different cytochemical methods were used to study the localization of uricase (EC 1.7.3.3) and catalase (EC 1.11.1.6) in developing root nodules of soybean (Glycine max) inoculated as seeds withBradyrhizobium japonicum. One of the methods employs DAB (3,3′-diaminobenzidine) and detects uricase activity indirectly by coupling it to endogenous catalase activity. The other method utilizes cerium chloride to detect uricase activity directly. These methods were modified to obtain not only a strong staining reaction but also improved ultrastructural preservation. With the indirect DAB method, intense staining indicative of both uricase and catalase activity was obtained in the enlarged peroxisomes of older uninfected cells. Similar staining was observed in enlarging peroxisomes of younger uninfected cells, and in the material of associated sacs whose bounding membranes appear to arise as distensions of the ER. The observations are discussed in relation to the controversial role of the ER in peroxisome biogenesis. Although the small peroxisome-like organelles of infected cells did not give a clearly positive reaction in the indirect DAB method, they reacted positively in the cerium chloride method, and are considered to be peroxisomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01273250
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  • 4
    Electronic Resource
    Electronic Resource
    Specialization of the inner cortex for ureide production in soybean root nodules (1989)
    Springer
    Protoplasma 150 (1989), S. 150-159 
    Details
    ISSN: 1615-6102
    Keywords: Inner cortex ; Peroxisomes ; Root-nodules ; Soybean ; Uricase cytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The possibility that cells in the inner cortex of determinate root nodules participate in ureide production from recently fixed N2, as do the uninfected (interstitial) cells of the infected central region, has been investigated in soybean (Glycine max) inoculated as seeds withBradyrhizobium japonicum. Like the interstitial cells, cells of the three innermost cortical layers produce enlarged peroxisomes and a meshwork of tubular ER during differentiation. These changes are most pronounced in the innermost cortical layer, are successively less so in the 2nd and 3rd layers, and are usually undetectable in more distant layers. Peroxisomes in the inner three layers are stained in the DAB (3,3′-diaminobenzidine) test for uricase (EC 1.7.3.3) activity, indicative of the potential for ureide formation, but peroxisomes in more distant cortical cells are not stained. A nodulespecific uricase also is demonstrable in the inner three cortical layers by immunogold labeling enhanced with silver for visualization in the light microscope. The observations suggest that with respect to ureide production the cells of the inner layers of the cortex are functionally similar to the interstitial cells of the infected region despite the apparent distinctiveness of the two regions anatomically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403671
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  • 5
    Electronic Resource
    Electronic Resource
    Incorporation of a well-defined polyether side-chain into segmented poly(ether-urethane urea) and examination for blood-compatibility (1989)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 172 (1989), S. 177-183 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine neue Methode zur Einführung von hydrophilen Polyetherseitenketten in segmentierte Polyurethane unter Verwendung eines Polypropylenoxid-Macromeren mit 1,3-Diol-Gruppen an einem Kettenende, die als Kettenverlängerer fungieren, beschrieben. In diesem Prozeß wird eine Seitenkette quantitativ und direkt in medizinische Polyurethanelastomere eingebaut. Diese Entwicklung ist auch für Biowerkstoffe in künstlichen Organen von Interesse.
    Notes: A new method of introducing a hydrophilic polyether side chain into segmented polyurethane using a polypropylene oxide macromer with 1,3-diol at one chain-end, which behaves as chain extender, is described. In this procedure, a molecular-designed side-chain is incorporated quantitatively and directly into polyurethane biomedical elastomer. The design is also of interest to biomaterials in artificial organs.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1989.051720115
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  • 6
    Electronic Resource
    Electronic Resource
    Dioxygen sensitivity of a photoexcited thin film of phthalocyanine dispersed in poly(N-vinylcarbazole) (1988)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 189 (1988), S. 2419-2423 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Thin films (thickness 0,3 μm) of a mixture of phthalocyaninatozinc(II) (1) and poly(1-vinylcarbazole) (2) are prepared by coating from a solution on ITO glass. The blue coloured films are investigated in an electrochemical cell under irradiation with visible light. In the presence of dioxygen from air the films exhibit an intensive cathodic photocurrent. The action spectrum of the photocurrent corresponds to the absorption spectrum of the phthalocyanine. The results show a device which can be switched by air and visible light.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1988.021891019
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  • 7
    Electronic Resource
    Electronic Resource
    Quenching of the excited state of membranes having polymerpendant tris(2,2′-bypyridine)ruthenium(II) groups by methylviologen and dioxygen (1987)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 188 (1987), S. 2011-2017 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Quenching of the excited state of copolymer-pendant Ru(bpy)2+3 membranes by methylviologen (MV2+) and dioxygen was studied and its application proposed. The copolymers used were the copolymer of styrene (St) and 4-methyl-4′-vinyl-2,2′-bipyridine (Vbpy) and that of methyl methacrylate (MMA) and Vbpy. The copolymer-pendant complexes were prepared by reaction of the St- and MMA-copolymers with cis-Ru(bpy)2Cl2. The excited state of the St-copolymer complex membrane was not quenched by MV2+ solution in aqueous medium, but quenched in methanol. The excited state of the MMA-copolymer complex membrane was not quenched by MV2+ neither in water nor in water/methanol mixture. The excited state of St-copolymer complex membrane was not quenched by dioxygen in water, but in methanol. The excited state of MMA-copolymer complex membrane was quenched by dioxygen both in water and water/methanol mixture. The quenching by dioxygen can be used to measure the oxygen concentration in solutions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1987.021880823
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  • 8
    Electronic Resource
    Electronic Resource
    Quenching of photo-excited state of copolymer pendant Ru(bpy)32+ complexes with methylviologen (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 2749-2756 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymer pendant tris(2,2′-bipyridine)ruthenium(II) complexes were prepared from the copolymers of 4-methyl-4′-vinyl-2,2′-bipyridine with styrene, acrylic acid, methyl methacrylate, hydroxyethyl methacrylate, acrylonitrile, N-vinylpyrrolidone, 4-vinylpyridine, and quaternized 4-vinylpyridine. The quenching of the photo-excited state of the polymer complexes by methylviologen was studied. Pendant anionic groups such as acrylate enhanced remarkably the quenching of the cationic sensitizer by the cationic substrate, however, pendant cationic groups such as quaternized pyridine did not affect the reaction. The polymer chain showed generally retarding effect on the quenching reaction.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1986.080241104
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  • 9
    Electronic Resource
    Electronic Resource
    Solution viscosity behavior of polystyrene-based cationic ionomers: Effects of quaternary-group structure and counter ion (1995)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 33 (1995), S. 2449-2454 
    Details
    ISSN: 0887-624X
    Keywords: cationic ionomers ; polystyrene-based ionomers ; solution viscosity ; quaternary salts ; solvation ; aggregation of ionic groups ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dilute solution viscosity was investigated for several polystyrene-based cationic io-nomers. It was found that intramolecular aggregation among the ionic groups was strongly dependent on the sizes of quaternary onium groups and counter anions. The extent of the aggregation was controled by the solvent polarity and the solvation to the ionic groups. When there was a strong selective soivation to small counter ions, the structure of onium groups shows a minor effect on the viscosity behavior, indicating little aggregation among the ionic groups. A strong solvation to small quaternary cations also eliminates the intra-molecular aggregation and the influence of counter ions was barely observable. When the selective solvation to counter ions was disabled by the enlarged size of the counter ions, however, the viscosity depended on onium group structure or spacer chain length. If the solvent solvates neither counter ions nor quaternary groups, the smaller the sizes of onium cation and counter anion, the lower the reduced viscosity due to an enhancement of the ionic aggregate formation. © 1995 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1995.080331418
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis of polymers in aqueous solutions: Polyaddition of bis(oxazolines) with dithiol in aqueous solutions (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 2711-2717 
    Details
    ISSN: 0887-624X
    Keywords: reaction medium ; aqueous solution ; water ; polyaddition ; m-phenylenebis(2-oxazoline) ; p-phenylenebis(2-oxazoline) ; 1,4-butylenebis(2-oxazoline) ; bis(4-mercaptophenyl) sulfide ; poly(amide - sulfide) ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polyaddition of bis(4-mercaptophenyl) sulfide (BMPS) with m-phenylenebis(2-oxazoline) (MPBO) proceeded very smoothly in the mixtures of aprotic ploar solvents such as N-methyl-2-pyrrolidone (NMP) with water to produce the corresponding poly(amide-sulfide) with high molecular weights at 90°C under nitrogen. The reaction of BMPS with MPBO, p-phenylenebis(2-oxazoline), and 1,4-butylenebis(2-oxazoline) was also examined in water under the same conditions, and it was found that the reaction proceeds successfully to give the corresponding poly(amide-sulfide)s with high molecular weights. These results mean that water along as well as the mixed solvents of aprotic polar solvents such as NMP with water can be uses as suitable reaction media for the polyaddition of bis(oxazolines) with dithiol to synthesize poly(amide - sulfide)s with high molecular weights. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 2711-2717, 1997
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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