Browsing by Author "Leighton, Gerardo"

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    Temporal variation in usnic acid concentration in Usnea aurantiaco-atra (Jaq.) Bory
    (1991) Quilhot, Wanda; Peña, Wenceslao; Flores, Eva; Hidalgo, María Eliana; Fernández, Ernesto; Leighton, Gerardo
    In Usnea aurantiaco-atra (Jaq.) Bory, 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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