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  • 1
    Electronic Resource
    Electronic Resource
    Fluorescence and Fourier-transform infrared spectroscopic studies on the role of disulfide bond in the calcium binding in the 33 kDa protein of Photosystem II (1996)
    Springer
    Photosynthesis research 48 (1996), S. 379-384 
    Details
    ISSN: 1573-5079
    Keywords: calcium binding ; disulfide bond ; FTIR ; 33 kDa protein ; lanthanide ; Photosystem II
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The 33 kDa protein of Photosystem II has one intrachain disulfide bond. Fluorescence spectroscopy shows that the major groups in the protein that bind to Ca2+ should be the carboxylic side groups of glutamic acid and/or aspartic acid. Fluorescence and Fourier-transform infrared (FTIR) spectroscopic studies indicate that the conformation of the 33 kDa protein is altered upon reduction, while the reduced protein still retains the secondary structure. FTIR spectroscopy also shows that the metal ions induce a relative decrease of unordered structure and β-sheet, and a substantial increase of α-helix in both the intact and the reduced 33 kDa protein. This indicates that the addition of cations results in a much more compact structure and that both the intact and the reduced 33 kDa proteins have the ability to bind calcium. The above results may suggest that the disulfide bridge is not essential for calcium binding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00029470
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of the Brönsted and Lewis Acid Sites in Platinum/Solid Acid Catalysts on the Hydrogenation of Benzene and Toluene (2000)
    Springer
    Reaction kinetics and catalysis letters 69 (2000), S. 277-284 
    Details
    ISSN: 1588-2837
    Keywords: Aromatic hydrogenation ; Brönsted acid ; Lewis acid ; platinum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The hydrogenation of benzene and toluene was investigated over US-SSY, γ-Al2O3, and Ha1-MCM-41 supported platinum catalysts. The acidity of catalyst supports was measured by IR spectra of pyridine adsorption. On the Brönsted acid supported catalyst, both the hexacyclic saturation product and the pentacyclic one, the hydroisomerization product, were observed, and these two products were revealed to be primary reaction products. The two products were proposed to be formed competitively on Brönsted acid sites with carbonium ions as the reaction intermediate. By contrast, no hydroisomerization product was found on Lewis acid supported catalysts. It was inferred that the electron-deficient reaction intermediate formed on Lewis acids could not undertake any skeletal isomerization process to give a pentacyclic saturation product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005695715788
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    Paper (German National Licenses)
    Fulltext
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