23 research outputs found
Floristic overview of the epiphytic bryophytes of terra firme forests across the Amazon basin
Riqueza e estratifica莽茫o vertical de ep铆fitas vasculares na Esta莽茫o Ecol贸gica de Jata铆: 谩rea de Cerrado no Sudeste do Brasil
Vertical distribution of epiphytic bryophytes in Atlantic Forest fragments in northeastern Brazil
Aspectos brioflor铆sticos e fitogeogr谩ficos de duas forma莽玫es costeiras de Floresta Atl芒ntica da Serra do Mar, Ubatuba/SP, Brasil
Diversity of bryophytes in priority areas for conservation in the Atlantic forest of northeast Brazil
Four anti-protozoal and anti-bacterial compounds from Tapirira guianensis
Tapirira guianensis is a common tree used in traditional medicine in French Guiana against several infectious diseases (malaria, leishmaniasis, bacteria, etc.). The bioassay-guided purification of CH2Cl2 bark extract led to the isolation of four cyclic alkyl polyol derivatives: 4,6,2'-trihydroxy-6-[10'(Z)-heptadecenyl]-1-cyclohexen-2-one (1a), 1,4,6-trihydroxy-1,2'-epoxy-6-[10'(Z)-heptadecenyl]-2-cyclohexene (1b), 1,4,5,2'-tetrahydroxy-1-[10'(Z)-heptadecenyl]-2-cyclohexene (2), and 1,3,4,6-tetrahydroxy-1,2'-epoxy-6-[10'(Z)-heptadecenyl]-cyclohexane (3). The structures were established on the basis of ID and 2D NMR analyses. The anti-leishmanial, anti-plasmodial, anti-bacterial (on Staphylococcus aureus, Staphylococcus epidermidis and Escherichia coli), and anti-fungal (on Candida albicans) activities of the extracts and of these original compounds were evaluated. Two showed medicinal interest supporting the traditional uses of the plant. The structures were established through spectral analyses of the isolates and their derivatives