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C. Kohlhardt-Floehr, F. Boehm, S. Troppens, J. Lademann and T. G. Truscott 2010: Prooxidant and antioxidant behaviour of usnic acid from lichens under UVB-light irradiation ― studies on human cells. - Journal of Photochemistry and Photobiology B: Biology 101(1): 97-102. [RLL List # 221 / Rec.# 32433]
Keywords: USNIC ACID/ HUMAN LYMPHOID CELLS/ ANTIOXIDANT/ PROOXIDANT/ UV-B RADIATION/ MEDICINE
Abstract: [Study using usnic acid extracted from Xanthoparmelia farinosa. "Compared to the controls the cells incubated with usnic acid ... showed a higher cell survival and a normal metabolism under low doses of UVB-light .... When both higher UVB doses ... and higher concentrations of usnic acid ... where used, the opposite effect was observed. It is concluded that these effects are due to bifunctional (a switch of) anti-oxidative-pro-oxidative behaviour of usnic acid under UVB-irradiation."]
– 10.1016/j.jphotobiol.2010.06.017

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