Evaluation of the antimicrobial potential of Viguiera arenaria (Asteraceae), a diterpene-rich plant species of the Brazilian cerrado - Silva, José R. M. S.; Porto, Thiago Souza; Costa, Fernando Batista da; Carvalho, Tatiane C. de; Martins, Carlos H. G.; Ambrósio, Sérgio R.; Furtado, Niege Araçari Jacometti Cardoso (International Congress of Pharmaceutical Sciences (CIFARP), 2007)