• Bioactivity of prenylated hydroxybenzoic acids from Piper garagaranum C. DC 

      Sáenz Castillo, Antonio; Sanabria Chinchilla, Jean; García Piñeres, Alfonso J.; Tamayo Castillo, Giselle (2022)
      A bio-assay guided fractionation of Piper garagaranum C. DC. led to the isolation of two prenylated hydroxybenzoic acids (1-2) with anti-inflammatory and cytotoxic activities. The anti-inflammatory action was determined in ...
    • Bioassay-guided isolation of anti-inflammatory O-sulfated withanolides from Acnistus arborescens (Solanaceae) 

      Steinbrueck, Clara; Mora Ugalde, Nohelia; Morales Sánchez, Carlos; Loaiza Montoya, Randall; García Piñeres, Alfonso J.; Araya Barrantes, Juan José (2019)
      Bioassay-guided fractionation of Acnistus arborescens (Solanaceae) organic extract afforded two anti-inflammatory withanolides: 2,3-Dihydro-3β-O-sulfate withacnistin (1) and 2,3-Dihydro-3β-O-sulfate withaferin A (2) showing ...
    • Empleo de técnicas y materiales biológicos en la búsqueda de productos activos contra la malaria 

      Chinchilla Carmona, Misael; Guerrero Bermúdez, Olga Marta; Tamayo Castillo, Giselle; Sittenfeld Appel, Ana (2001)
      Se describen los métodos empleados en el estudio del efecto de extractos de insectos preparados en el Instituto Nacional de Biodiversidad de Costa Rica, sobre un tipo de malaria murina producida por el Plasmodium bergheim. ...
    • Phenolic variation among Chamaecrista nictitans subspecies and varieties revealed through UPLC-ESI(-)-MS/MS chemical fingerprinting 

      Quirós Guerrero, Luis Manuel; Albertazzi Castro, Federico José; Araya Valverde, Emanuel; Romero Chacón, Rosaura María; Villalobos Barrantes, Heidy M.; Poveda Álvarez, Luis Jorge; Chavarría Vargas, Max; Tamayo Castillo, Giselle (2019-01-19)
      Introduction Comparative analysis of metabolic features of plants has a high potential for determination of quality control of active ingredients, ecological or chemotaxonomic purposes. Specifically, the development of ...
    • Pristine but metal-rich Río Sucio (Dirty River) is dominated by Gallionella and other iron-sulfur oxidizing microbes 

      Arce Rodríguez, Alejandro; Puente Sánchez, Fernando; Avendaño Vega, Roberto; Libby Hernández, Eduardo; Rojas Sánchez, Leonardo; Cambronero Heinrichs, Juan Carlos; Pieper, Dietmar H.; Timmis, Kenneth N.; Chavarría Vargas, Max (2017-03)
      Whether the extreme conditions of acidity and heavy metal pollution of streams and rivers originating in pyritic formations are caused primarily by mining activities or by natural activities of metal-oxidizing microbes ...
    • The Bacterial Product Violacein Exerts an Immunostimulatory Effect Via TLR8 

      Venegas Solís, Francisco A.; Köllisch, Gabriele; Mark, Kerstin; Diederich, Wibke E.; Kaufmann, Andreas; Bauer, Stefan; Chavarría Vargas, Max; Araya Barrantes, Juan José; García Piñeres, Alfonso J. (2019)
      Violacein, an indole-derived, purple-colored natural pigment isolated from Chromobacterium violaceum has shown multiple biological activities. In this work, we studied the effect of violacein in different immune cell lines, ...