Essential Oils from Piper cernuum and Piper regnellii: Antimicrobial Activities and Analysis by GC/MS and 13C-NMR - Costantin, Mara B; Sartorelli, Patrícia; Limberger, Renata; Henriques, Amélia T; Steppe, Martin; Ferreira, Marcelo J P; Ohara, Mitsuko T; Emerenciano, Vicente P; Kato, Massuo J (Planta Medica, 2001)