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  • Key words Alps  (1)
  • imidazoles  (1)
  • micelles  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Vegetation dynamics and arbuscular mycorrhiza in old-field successions of the western Italian Alps (2000)
    Springer
    Mycorrhiza 10 (2000), S. 63-72 
    Details
    ISSN: 1432-1890
    Keywords: Key words Alps ; Arbuscular-mycorrhiza ; Inoculum potential ; Old-field succession ; Vegetational dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationships between vegetational and arbuscular mycorrhizal (AM) dynamics were investigated in an old-field succession in the western Italian Alps. Vegetation and AM colonization were determined in eight sites corresponding to different stages of successional dynamics: (a) a field under cultivation; (b) fields abandoned for 1, 2 and 3 years supporting ruderal vegetation; (c) grasslands; (d) shrublands; (e) early wood communities; (f) mature woods. AM colonization was evaluated on the roots of representative plants from each community. The data thus obtained, together with those from the literature, were then used to calculate the plant community mycorrhizal index. This index provides qualitative and quantitative information concerning the relative percentage of non-mycorrhizal, AM and ectomycorrhizal plant cover in an entire plant community. The AM inoculum potential of each site was also determined using a bait approach. Farming disturbance temporarily reduced soil infectivity. Non-mycorrhizal ruderal annuals dominated after 1 year abandonment and covered 90–100 % of the surface. After 2 or 3 years, a rapid change to AM-colonized competitive and competitive-ruderal perennials was observed. The increase in AM inoculum was associated with an increase in floristic richness and equitability in the community. AM were also dominant in the shrublands and early wood communities, but gave way to ectomycorrhizal species in the mature woods. The observed AM inoculum potentials are in accordance with these findings. The results of this study further emphasize the need to take into account AM infection in plans for the renaturalization of degraded areas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005720000059
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    13C NMR spectroscopy of tautomeric conversions in imidazole compounds (1992)
    Springer
    Russian chemical bulletin 41 (1992), S. 223-230 
    Details
    ISSN: 1573-9171
    Keywords: 13C NMR ; imidazoles ; tautomerism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A study has been made of13C NMR spectra of several series of imidazoles and their salts in solution and in the solid state. It has been shown that in compounds containing a pyridine ring, prototropic tautomerism on the NMR time scale may be retarded. The possible mechanism of these processes is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00869505
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaporation from microemulsions (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 152-161 
    Details
    ISSN: 1435-1536
    Keywords: Microemulsions ; detergents ; liquid crystals ; evaporation ; micelles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The composition of W/O microemulsions during slow evaporation at room temperature and at 90°C was determined by chemical analysis. One series of microemulsions was stabilized by pentanol combined with sodium dodecyl sulfate, the other one was combined with hexadecyltrimethylammonium bromide. The hydrocarbon was styrene and the evaporation in the microemulsion was compared to that of the corresponding styrene/pentanol solutions. The results showed significant influence on the evaporation by the microemulsion structure; especially for water contents close to the minimum for stability
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651818
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    Paper (German National Licenses)
    Fulltext
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