Browsing by Author "Hidalgo, M. Eliana"
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Item Preliminary data on the accumulation of usnic acid related to ozone depletion in two Antarctic lichens(1996) Quilhot, Wanda; Fernández, Ernesto; Rubio, Cecilia; Cavieres, M. Fernanda; Hidalgo, M. Eliana; Goddard, Marcela; Galloway, DavidThe 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 makes it possible to study the relations between the UV absorbers and ozone levels in different time scales. Usnic acid is the most frequent UV-B absorber in antarctic lichens. In Neuropogon aurantiaco-ater (Jacq.) I. M . Lamb. and Ramalina terebrata Hook. et Tayl., collected in Antarctica over a period of 30 years, the highest concentrations ofusnic acid were observed when ozone diminished to critical values.