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usnea barbata PubMed: Usnea barbata CO2-supercritical extract in alkyl polyglucoside-based emulsion system: contribution of Confocal Raman imaging to the formulation development of a natural product. PubMed: Biological activities of Toninia candida and Usnea barbata together with their norstictic acid and usnic acid constituents. PubMed: Atmospheric background trace elements deposition in Tierra del Fuego region (Patagonia, Argentina), using transplanted Usnea barbata lichens. PubMed: Iridium, platinum and rhodium baseline concentration in lichens from Tierra del Fuego (South Patagonia, Argentina). PubMed: A contribution to the lichenized fungi of Bosnia and Herzegovina. PubMed: Lichen Usnea barbata as biomonitor of airborne elements deposition in the Province of Tierra del Fuego (southern Patagonia, Argentina). PubMed: Review of usnic acid and Usnea barbata toxicity. PubMed: Usnea barbata extract prevents ultraviolet-B induced prostaglandin E2 synthesis and COX-2 expression in HaCaT keratinocytes. PubMed: Identification and quantitation of usnic acid from the lichen Usnea species of Anatolia and antimicrobial activity. PubMed: Screening of plant extracts for antimicrobial activity against bacteria and yeasts with dermatological relevance. PubMed: Background levels of heavy metals in plants of different taxonomic groups from a montane rain forest in Sri Lanka. PubMed: Contributions to the complex study of some lichens-Usnea genus. Pharmacological studies on Usnea barbata and Usnea hirta species.