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Electron paramagnetic resonance (EPR) investigations of lichens - 1 :effects of air pollution.
Autorzy
Rok wydania
1999
Czasopismo
Numer woluminu
33
Strony
4629-4635
DOI
10.1016/S1352-2310(99)00258-7
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Electron paramagnetic resonance (EPR) investigations were carried out on more than 800 samples of lichens from Lower Silesia, southwest Poland. A statistically confirmed correlation between annual average concentration of sulphur dioxide in the atmosphere and concentration of semiquinone radicals in Hypogymnia physodes thalli was found. Similar results were obtained for Umbilicaria species from the Karkonosze Mountains. Distribution of semiquinone radicals in lichen thalli was also investigated. The action of nitrogen dioxide on Umbilicaria species resulted in the synthesis of iminoxy radicals in the thalli. The intensification of the semiquinone free radical production in lichen thalli from atmospherically polluted environments and the degradation of lichen acids to β-diketone compounds would appear to be parallel processes. The properties of the iminoxyls derived from β-diketones in the lichen matrix (anisotropic spectra at room temperature) and in organic solutions after extraction procedure were also examined by EPR.
Słowa kluczowe
EPR, Lichen, Air pollution monitoring, Biomonitoring, Iminoxy radical
Adres publiczny
https://doi.org/10.1016/S1352-2310(99)00258-7
Strona internetowa wydawcy
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