“…Despite some investigations during the last decade (Al-Fatimi et al, 2007;Awadh et al, 2001;Mothana & Lindequist, 2005;Mothana et al, 2006Mothana et al, , 2007Mothana et al, , 2009), a minority of traditionally used medicinal plants have been evaluated for their pharmacological and chemical properties. Considering the importance of these untapped research areas, the aim of the present study was to evaluate the in vitro antimicrobial, antitumor, and antioxidant activities of 33 important medicinal plants, which are used in the Yemeni traditional medicine for various disorders including infectious diseases as well as different types of inflammations.…”