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  • Chemistry  (15)
  • General Chemistry  (4)
  • Uricase cytochemistry  (2)
  • 78.20.Dj  (1)
  • 1985-1989  (18)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 78.20.Dj ; 68.55.+b ; 78.20.Ls
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00616064
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  • 2
    Digitale Medien
    Digitale Medien
    Cytochemical localization of uricase and catalase in developing root nodules of soybean (1987)
    Springer
    Protoplasma 140 (1987), S. 1-12 
    Details
    ISSN: 1615-6102
    Schlagwort(e): Cerium chloride ; Diaminobenzidine (DAB) ; Peroxisomes ; Root-nodules ; Soybean ; Uricase cytochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01273250
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  • 3
    Digitale Medien
    Digitale Medien
    Specialization of the inner cortex for ureide production in soybean root nodules (1989)
    Springer
    Protoplasma 150 (1989), S. 150-159 
    Details
    ISSN: 1615-6102
    Schlagwort(e): Inner cortex ; Peroxisomes ; Root-nodules ; Soybean ; Uricase cytochemistry
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01403671
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: 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.
    Notizen: 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.
    Zusätzliches Material: 2 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/apmc.1989.051720115
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  • 5
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: 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.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1988.021891019
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  • 6
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: 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.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/macp.1987.021880823
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  • 7
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pola.1986.080241104
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  • 8
    Digitale Medien
    Digitale Medien
    Polynuclear-metal-complex batteryDedicated to Professor Georg Manecke in the Free University of Berlin for his 70th birthday. (1986)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 24 (1986), S. 435-437 
    Details
    ISSN: 0887-6258
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pol.1986.140240901
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  • 9
    Digitale Medien
    Digitale Medien
    Acoustoelectric technique for assessing the mechanical state of the dental implant-bone interface (1986)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 20 (1986), S. 169-176 
    Details
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: A simple technique is described for in vivo assessing the interfacial rigidity between a dental root implant and the bone surrounding it. The method is based on estimating the frequency (10 to 150 KHz) and amplitude of the vibration of the implant induced by a small pulsed force. Application of the force to the implant and detection of the vibrational signal from the implant are performed by lightly touching it with two fine needles connected with piezoelectric elements. A distinct signal difference observed in animal tests of bioactive implant and nonbioactive one is shown to well agree with that obtained from corresponding ex vivo models.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jbm.820200206
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  • 10
    Digitale Medien
    Digitale Medien
    O2-Erzeugung durch Oxidation von Wasser mit Mangankomplexen als Heterogenkatalysatoren (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 98 (1986), S. 824-825 
    Details
    ISSN: 0044-8249
    Schlagwort(e): Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ange.19860980918
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