Browsing by Autor "Marcela Melgarejo"
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Item type: Item , ANTIBACTERIAL ACTIVITY OF FOUR NATURAL PRODUCTS FROM A BOLIVIAN HIGHLANDS PLANT(Universidad Autónoma del Estado de México, 2006) Marcela Melgarejo; Patricia Mollinedo; Julio Enrique Ocampo Castro"The study was conducted to evaluate the antibacterial potential activity of four natural compounds isolated from different higher plants collected from Pazña (Oruro – Bolivia) on the Bolivian Altiplano. Antibacterial activity was evaluated against ten bacterial strains. Agar ditch diffusion method was used to study the antibacterial activity of these compounds. Three of these four compounds exhibited considerable antibacterial activity."Item type: Item , MORE INVESTIGATIONS IN POTENT ACTIVITY AND RELATIONSHIP STRUCTURE OF THE LICHEN ANTIBIOTIC (+)-USNIC ACID AND ITS DERIVATE DIBENZOYLUSNIC ACID(Universidad Autónoma del Estado de México, 2008) Marcela Melgarejo; Olov Sterner; Julio Enrique Ocampo Castro; Patricia Mollinedo"By reacting R-(+)-usnic acid (1) with benzoyl chloride in presence of pyridine gave the dibenzoylusnic acid (2). The antibacterial activity and relationship structure of acid usnic an old lichen drug and its derivate dibenzoylusnic acid was studied against nine ATCC bacteria and one bacterium clinical isolate./ Mediante la reacción del R-(+)-acido úsnico con cloruro de benzoilo en presencia de piridina se obtuvo el acido dibenzoilusnico. Se estudio la relación de actividad antibacteriana y estructura del R-(+)-acido úsnico y su derivado el acido dibenzoilúsnico contra nueve bacterias ATCC y una bacteria clínicamente aislada."Item type: Item , Triterpenes and anthraquinones from Picramnia sellowii Planchon in Hook (Simaroubaceae)(Elsevier BV, 2001) Luisa Balderrama; Alessandra Braca; Emilia García; Marcela Melgarejo; Cosimo Pìzza; Nunziatina De Tommasi