11 research outputs found

    Antimicrobial activity of Latin American medicinal plant extracts

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    Resistance of pathogenic microorganisms to several drugs has increased due to the widespread use of antibiotics to treat infectious diseases. Hence, development of new antimicrobial drugs from plants is an area of active research in the search for medicinal, veterinary or agricultural industry use. For this work 19 plants species was collected, dried in the shade and oven. 20 g powder plant were macerated in cold either with dichloromethane (DCM) or methanol (MeOH) filtered, evaporated to yield determination expressed in grams per 100g of dry plant. Methods: Antibacterial activity assays of the DCM and MeOH extracts were performed by agar diffusion. Paper disks were then impregnated with 10 ul of extract (range: 340-614mg/disc for MeOH; 300-500mg/disc for DCM). Solvents of DCM or MeOH extracts were used as negative controls (NC) and Gentamicin and Cephazoline were used as positive control (PC). The microorganisms used for testing were Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923, and Pseudomonas aeruginosa ATCC 27853. The inoculum was incorporated to Petri plates and paper disks with extracts were added, and incubated for 24 hours at 37°C. Results: All DCM extracts tested except Gentianella parviflora, Baccharis crispa, Bauhinia candicans, Terminalia langiflora and Picrosia australis showed activity against Staphylococcus aureus. The DCM extracts of the three species of Gaillardia showed to be as well active against Escherichia coli. Only the MeOH extracts of Baccharis crispa, Gentianella achalensis, Lippia turbinata, Lippia germinata, Terminalia australis and bicolor adesmia were active against Staphylococcus aureus. Conclusion: dichloromethane extracts of Gaillardia and Protousnea poepiggii species might be important sources for the isolation of compounds with antimicrobial activity with a potential use in the pharmaceutical industry.Facultad de Ciencias Exacta

    Antimicrobial activity of Latin American medicinal plant extracts

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    Resistance of pathogenic microorganisms to several drugs has increased due to the widespread use of antibiotics to treat infectious diseases. Hence, development of new antimicrobial drugs from plants is an area of active research in the search for medicinal, veterinary or agricultural industry use. For this work 19 plants species was collected, dried in the shade and oven. 20 g powder plant were macerated in cold either with dichloromethane (DCM) or methanol (MeOH) filtered, evaporated to yield determination expressed in grams per 100g of dry plant. Methods: Antibacterial activity assays of the DCM and MeOH extracts were performed by agar diffusion. Paper disks were then impregnated with 10 ul of extract (range: 340-614mg/disc for MeOH; 300-500mg/disc for DCM). Solvents of DCM or MeOH extracts were used as negative controls (NC) and Gentamicin and Cephazoline were used as positive control (PC). The microorganisms used for testing were Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923, and Pseudomonas aeruginosa ATCC 27853. The inoculum was incorporated to Petri plates and paper disks with extracts were added, and incubated for 24 hours at 37°C. Results: All DCM extracts tested except Gentianella parviflora, Baccharis crispa, Bauhinia candicans, Terminalia langiflora and Picrosia australis showed activity against Staphylococcus aureus. The DCM extracts of the three species of Gaillardia showed to be as well active against Escherichia coli. Only the MeOH extracts of Baccharis crispa, Gentianella achalensis, Lippia turbinata, Lippia germinata, Terminalia australis and bicolor adesmia were active against Staphylococcus aureus. Conclusion: dichloromethane extracts of Gaillardia and Protousnea poepiggii species might be important sources for the isolation of compounds with antimicrobial activity with a potential use in the pharmaceutical industry.Facultad de Ciencias Exacta

    La renovación de la palabra en el bicentenario de la Argentina : los colores de la mirada lingüística

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    El libro reúne trabajos en los que se exponen resultados de investigaciones presentadas por investigadores de Argentina, Chile, Brasil, España, Italia y Alemania en el XII Congreso de la Sociedad Argentina de Lingüística (SAL), Bicentenario: la renovación de la palabra, realizado en Mendoza, Argentina, entre el 6 y el 9 de abril de 2010. Las temáticas abordadas en los 167 capítulos muestran las grandes líneas de investigación que se desarrollan fundamentalmente en nuestro país, pero también en los otros países mencionados arriba, y señalan además las áreas que recién se inician, con poca tradición en nuestro país y que deberían fomentarse. Los trabajos aquí publicados se enmarcan dentro de las siguientes disciplinas y/o campos de investigación: Fonología, Sintaxis, Semántica y Pragmática, Lingüística Cognitiva, Análisis del Discurso, Psicolingüística, Adquisición de la Lengua, Sociolingüística y Dialectología, Didáctica de la lengua, Lingüística Aplicada, Lingüística Computacional, Historia de la Lengua y la Lingüística, Lenguas Aborígenes, Filosofía del Lenguaje, Lexicología y Terminología

    Revista de educación

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    Se reproduce el bloque dedicado a la revisión del método didáctico del Comentario de Textos en el Curso Pre-universitario, que se editó en el número monográfico 27-28 de 1955 de la Revista de Educación. En este apartado, diversos catedráticos de gran importancia, desarrollan el comentario de un texto en concreto que servirá de ejemplo de método didáctico para el resto de profesores que impartan la misma disciplina en los Institutos. Los comentarios son los que siguen: El 'Libro de Job', comentado por Fray Luis de León; Comentario al 'Fedón' de Platón; Comentarios de 'El sueño de Escipión' de Cicerón, Dos comentarios al Libro I de las 'Confesiones' de San Agustín, Comentario a un texto de Boecio, Comentario al 'De ente et essentia' de Santo Tomás de Aquino, Comentario al Capítulo VIII de la Primera Parte de 'Don Quijote', 'La Aventura de los Molinos de Viento'; Comentario a dos Textos de Quevedo; Comentario a 'La Vida es sueño' de Calderón; Comentario al 'Discurso de Metafísica' de Leibniz; Goethe, Naturalista y para concluir, 'El comentario de un texto científico'. Todos ellos tienen una parte expositiva de desarrollo de comentario de textos junto con una prolija bibliografía a colación del texto comentado.Ministerio Educación CIDEBiblioteca de Educación del Ministerio de Educación, Cultura y Deporte; Calle San Agustín, 5 - 3 Planta; 28014 Madrid; Tel. +34917748000; [email protected]
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