| determination of usnic acid in some rhizoplaca species from middle anatolia and their antimicrobial activities. | three species of lichens, rhizoplaca chrysoleuca (sm.) zopf, rhizoplaca melanopthalma (dc.) leuckert & poelt and rhizoplaca peltata ramonds leuckert, were collected from middle anatolia, erciyes mountain (kayseri) in turkey. their usnic acid amounts were determined by hplc in acetone extracts. in addition, antimicrobial activities of these extracts were determined against escherichia coli (atcc 35218), enterococcus faecalis (rskk 508), proteus mirabilis (pasteur ens. 235), staphylococcus aureus, ... | 2006 | 16610216 |