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  • 1
    Electronic Resource
    Electronic Resource
    Tree bark as a bioindicator of air pollution in Navarra, Spain (1997)
    Springer
    Water, air & soil pollution 98 (1997), S. 381-387 
    Details
    ISSN: 1573-2932
    Keywords: air pollution ; bioindicator ; biomonitoring ; tree bark
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract During a two year research period from 1992 to 1993, samples of different species of trees were taken in 17 forest stands located in Navarra, Spain. From these samples, bark extracts were prepared in which the pH and the conductivity were measured. The health of the sampling trees was also evaluated by determining the degree of defoliation and decoloration of the canopies. The bark tissue analysis revealed the presence of an environmental acidity gradient that decreased from NW to SE. This coincides with the location of important sources of pollution and their course of transport and dispersion. On the other hand, in the samples of Quercus ilex a significant correlation between the pH and the defoliation levels (P≤0.01, r = 0.62) was found. This fact reveals the potential usefulness of tree bark as a health bioindicator of trees.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026431211784
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Monitoring of the Phytosanitary State of Navarra's Forests, Spain (1998)
    Springer
    Environmental monitoring and assessment 50 (1998), S. 217-231 
    Details
    ISSN: 1573-2959
    Keywords: biomonitoring ; damage inventory ; forest assessment ; forest decline
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Between 1988 and 1993 six surveys on the condition of forests in Navarra (North Spain) were carried out. The results, relating to 408 trees in 17 sampling points, showed that the overall percentage of damaged trees increased from 2.86% in 1988 to 18.6% in 1993, which indicates a general large-scale deterioration of forest condition. Among the most common groups of trees, the most severely affected species were Quercus faginea, Quercus robur and Pinus sylvestris. Furthermore, it was observed that defoliation and discoloration processes did not occur randomly between stand trees, but the trees that were damaged one year (1992) were more predisposed to suffer damage in the next year (1993).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005879728924
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Tree bark as a bioindicator of air pollution in Navarra, spain (1997)
    Springer
    Water, air & soil pollution 98 (1997), S. 381-387 
    Details
    ISSN: 1573-2932
    Keywords: air pollution ; bioindicator ; biomonitoring ; tree bark
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract During a two year research period from 1992 to 1993, samples of different species of trees were taken in 17 forest stands located in Navarra, Spain. From these samples, bark extracts were prepared in which the pH and the conductivity were measured. The health of the sampling trees was also evaluated by determining the degree of defoliation and decoloration of the canopies. The bark tissue analysis revealed the presence of an environmental acidity gradient that decreased from NW to SE. This coincides with the location of important sources of pollution and their course of transport and dispersion. On the other hand, in the samples ofQuercus ilex a significant correlation between the pH and the defoliation levels (P≤0.01, r=0.62) was found. This fact reveals the potential usefulness of tree bark as a health bioindicator of trees.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02047045
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Stereoselection in designed three-helix bundle metalloproteins (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 10 (1998), S. 35-40 
    Details
    ISSN: 0899-0042
    Keywords: de novo design ; self-assembly ; metalloproteins ; diastereoselection ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The stereochemical consequences of the metal-ion assisted self-assembly of parallel three-helix peptide bundles are investigated. Chiral induction in the self-assembly of systems containing extensive protein secondary structure is compared with the racemic synthesis of short metallopeptides. Isolation and characterization of the individual stereoisomers of an exchange-inert metalloprotein provide structural insights into analogous exchange-labile systems. Chirality 10:35-40, 1998. © 1998 Wiley-Liss,Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.7
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of components for supramolecules incorporating cycloheptatriene building blocks (1998)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 340 (1998), S. 632-641 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Molecular threads I-III incorporating 1,3,5-cycloheptatriene units have been synthesized by three methods. Bridges were designed as ether (9, 14, 18 and 22), ester (4 and 14) and amino functions (25), respectively, The attachment of a second aryl residue at the seven-membered ring by nucleophilic attack of activated aromatic compounds such as anilines on tropylium salts resulted in the formation of two regioisomers (26 and 27). The macrocycles 28 were formed under high dilution conditions in good yields.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19983400707
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    Paper (German National Licenses)
    Fulltext
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