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  • 1
    ISSN: 0014-5793
    Keywords: Bacteriorhodopsin ; Blue bacteriorhodopsin ; Photocycle ; Protonation change ; Solid-state nuclear magnetic resonance (NMR)
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0014-5793
    Keywords: Bacteriorhodopsin ; Blue bacteriorhodopsin ; Photocycle ; Protonation change ; Solid-state nuclear magnetic resonance (NMR)
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    FEBS Letters 222 (1987), S. 275-278 
    ISSN: 0014-5793
    Keywords: Bacteriorhodopsin ; EXAFS ; M-intermediate ; Metal-substituted bacteriorhodopsin ; Photocycle
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1017
    Keywords: Bacteriorhodopsin ; Photocycle ; Time resolved infrared spectroscopy ; Photocurrent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract The light activated absorbance changes and photo-electric events of bacteriorhodopsin (bR) were simultaneously measured. The results were compared with the kinetics of the time resolved infrared signals which are characteristic for protonation changes of Asp residues, chromophore vibrations, and amide I vibrations. Each data set was analyzed separately. Assuming first order reactions the experimental curves in the time range from L back to bR could be fitted by a sum of five exponentials. However, for the photocurrent signal only four exponentials were necessary. The corresponding half-life times were of the same order of magnitude. Simultaneous fits of the traces from absorption changes in the visible range and the photocurrent signal provided evidence that the photocurrent data could also be described by the same sum of exponentials as the data obtained in the visible range. The rate constants obtained from the different methods applied were, within the limits of error, identical. These results demonstrate that retinal monitors not only charge displacements but also conformational movements of the protein moiety. The reprotonation of the Schiff base occurs synchronously with a protonation change of an internal aspartic acid which absorbs at 1755 cm−1. From the IR-signals, amplitude spectra could be derived which provided evidence that Asp-residues absorbing at 1765 cm−1 (Asp85) and 1755 cm−1 are still protonated in the O-intermediate. Major conformational changes of the peptide back bone occur in the time range of the L → M transition and with opposite sign during the decay of the O-intermediate.
    Type of Medium: Electronic Resource
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  • 5
    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: The polymerisation of acrylonitrile-methylacrylate in the presence of polyalkylene-glycolsulphoalkylethers and β-alkenyloxy-polyalkylene glycolsulphoalkylethers in an aqueous solution with the addition of redox catalysts was examined. The polymerisation yields acrylonitrile polymers which can be dyed with basic dyestuffs.Acrylonitrile polymers which can easily be dyed with acid dyestuffs are obtainable by polymerisation of the monomers in the presence of basic imides or tertiary nitrogen atom-containing polyurethanes, polyamides, polyethers or derivatives thereof which are quaternised with dimethylsulphate.The reactivity of these prepolymers is substantially increased by incorporation of unsaturated groups (allyl or methacryloylsubstituents) as can be shown with polyethers.
    Notes: Die Polymerisation von Acrylnitril-Methylacrylat in Gegenwart von Polyalkylenglykosulfoalkyläthern und β-Alkenyloxy-polyalkylenglykosulfoalkyläthern in wäßriger Lösung unter Verwendung von Redoxkatalysatoren wurde untersucht. Es konnten dabei Acrylnitrilpolymerisate erhalten werden, die sich mit basischen Farbstoffen anfärben lassen.Mit sauren Farbstoffen gut anfärbbare Acrylnitrilpolymerisate lassen sich durch Polymerisation der Monomeren in Anwesenheit von basischen Imiden oder auch tertiäre Stickstoffatome aufweisenden Polyurethanen, Polyamiden, Polyäthern bzw, deren mit Dimethylsulfat quaternierten Derivaten erhalten.Dabei wird die Reaktivität dieser Präpolymeren durch Einführung ungesättigter Gruppierungen (Allyl- oder Methacryloylsubstituent) wesentlich erhöht, wie sich bei Polyäthern zeigen läßt.
    Additional Material: 10 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 17 (1991), S. 25-30 
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: This paper reports an examination of the chemistry of single-crystal calcite (CaCO3) using x-ray photoelectron spectroscopy (XPS). This calcite cleavage surface was examined as freshly opened in vacuum and after several different treatments, including exposure to water vapor, covered with different amounts of evaporated Mn, ion sputtered and immersed in pure water. Clean and ion-sputtered calcite were not observed to react with water vapor. Ion sputtering caused significant changes to both oxygen and calcium bounding at the surface. However immersion of sputtered calcite in water caused removal of the sputter damage and produced an XPS spectrum nearly indistinguishable from that of the fresh cleavage surface. The shapes and positions of the Mn and O peaks in the spectra of CaCO3 with submonolayer coverages of Mn indicate partial oxiation of the metal as deposited presumably owing to reaction with the calcite surface. Immersion of the Mn-coated calcite in water caused further changes in the Mn peak, suggesting additional oxidation of the Mn.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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