Temporal variation in usnic acid concentration in Usnea aurantiaco-atra in Antarctica
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资源简介：
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 rates were quantified from
January to May; there was a significant decrease in the concentrations from
June to December, during the three years of study. In spite of the thalli were
taken from a same location, variations could be observed in the usnic acid
concentration in the individuals from within each monthly sample.
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SCIOPS
