Chemical composition and antimicrobial activities of the essential oil of Hypericum cordatum (Vell. conc.) N. Robson (Hypericaceae) - Ladeira, Angela Maria; Silva, Giovanna Bezerra da; Raggi, Ludmila; Young, Maria Claudia Marx; Agripino, Débora G.; Lima, Marcos Enoque Leite; Moreno, Paulo Roberto Hrihorowitsch (Journal of Essential oil Research, 2009)