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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and properties of C60-containing poly(vinyl alcohol) (1997)
    Springer
    Journal of polymer research 4 (1997), S. 17-24 
    Details
    ISSN: 1572-8935
    Keywords: Buckminsterfullerene C60 ; Poly(vinyl alcohol) ; Cyclic voltammetry ; Redox feasibility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Poly(vinyl alcohol) (PVA) was reacted with strong base NaH to yield pendant oxy anions, followed with nucleophilic addition to C60. The resulted PVA(C60-Na+)n products were then converted to PVA(C60H)n by stirring with a strong acid cation exchanger of H+-form. Extraction of the C60-containing PVAs by toluene, which is a good solvent for C60, exhibits no color transfer to the toluene phase. The C60-containing PVAs were identified by the characteristic IR and UV-Vis absorptions of C60. The electrochemical behaviors in solution or in film state were investigated by cyclic voltammetric methods. The cyclic voltammogram of 4a shows a reduction peak at −2.30 V which should be due to the bonded C60 chromophores. In the film state, obtained by coating C60-containing PVA solution on graphite electrode, PVA(C60-Na+)n is much easily reduced and oxidized than PVA(C60H)n. Furthermore, the difference in this reduction and oxidation feasibility is enhanced with increasing C60 content. However, coating with PVA(C60H)n or PVA(C60-Na+)n reduces the redox ability of the graphite electrode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0003-5
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  • 2
    Electronic Resource
    Electronic Resource
    DNA binding and bending by a chloroplast-encoded HU-like protein overexpressed in Escherichia coli (1997)
    Springer
    Plant molecular biology 34 (1997), S. 339-343 
    Details
    ISSN: 1573-5028
    Keywords: chloroplast ; DNA bending ; DNA binding ; HU-like protein
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The Guillardia theta chloroplast hlpA gene encodes a protein resembling bacterial histone-like protein HU. This gene was cloned and overexpressed in Escherichia coli cells, and the resulting protein product, HlpA, was purified and characterized in vitro. In addition to exhibiting a general DNA-binding activity, the chloroplast HlpA protein also strongly facilitated cyclization of a short DNA fragment in the presence of T4 DNA ligase, indicating its ability to mediate very tight DNA curvatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005867215258
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of the structure of lignin-carbohydrate complexes by the specific13C tracer method (2000)
    Springer
    Journal of wood science 46 (2000), S. 130-136 
    Details
    ISSN: 1611-4663
    Keywords: Lignin-carbohydrate complexes ; NMR ; 13C tracer ; Coniferin ; Ketal linkage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In the present study the specifically13C-enriched lignin precursors of biosynthesis (i.e., coniferin-[side chainα−13C], coniferin-[side chain-β−13C] and coniferin-[side chain-γ−13C]) were synthesized and administered exogeneously to ginkgo shoots (Ginkgo biloba L.) to obtain13C-enriched lignin-carbohydrate complexes (LCCs). The specifically13C-enriched LCCs were isolated from the newly formed xylem of ginkgo shoots administered with the13C-enriched precursors and degraded by enzymes. Lignin-rich fractions, so called enzyme-degraded LCCs (EDLCCs), were obtained. By determining their13C-NMR spectra, information related to the chemical structure of lignin building units and linkages between phenylpropane units of lignin and carbohydrates were obtained. It was found that these precursors were incorporated in natural lignin successfully. Three lignin-carbohydrates linkages (i.e., ether type, ester type, ketal type) were found at the C α -position of the side chain of phenylpropane units in ginkgo LCC. No lignin-carbohydrate bond at the Cβ- or Cγ-position of the lignin side chain was observed in the13C-NMR spectra of the13C-enriched LCCs. This fact indicates that a specific13C tracer technique can be useful in NMR study of the chemical structure of LCCs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00777359
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