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5 Titles Match Your Query
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1. Preliminary data on the accumulation of usnic acid related to ozono depletion in two lichens [003-94_01]
The absorbing properties of UV radiation of lichen phenols agree with their photoprotector capacity determined by in vivo and in vitro methods. The photostability that characterizes these compounds ...


2. Quantitative variations of phenolic compounds related to thallus age in Umbilicaria antarctica in Antarctica [110-88_02]
Densitometric analysis (HPTLC) was used to determine the concentrations of phenolic metabolites in thalli of different ages in Umbilicaria antarctica Frey et Lamb. Usnic acid and atranorin concentrations ...


3. Temporal variation in usnic acid concentration in Usnea aurantiaco-atra in Antarctica [110-88_01]
In Usnea aurantiaco-atra, growing in the Antarctica, a monthly variation in the usnic acid content, in individual thalli, was studied by means of scanning densitometry (HPTLC). The higher accumulation ...


4. The occurrence of gold in Usnea auratiaco-atra [110-88_03]
In Usnea aurantiaco-atra (Jacq)- Bory, a lichen species collected in the Antarctica, the gold content was determined by the cupellation methods, 317 ppb and 1089 ppb dry weight were found in the lichen ...


5. UV Radiation at Robert Island, South Shetland, Antarctica [003-94_02]
Solar ultraviolet radiation measurements by means of chemical actinometry and spectroradiometric instrumental were carried out at the Risopatron base at Robert Island, Antarctic, during January 1996. ...


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