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  • 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. ...
  • Germacranolides from Mikania guaco 

    Rüngeler, Peter; Brecht, Volker; Tamayo Castillo, Giselle; Merfort, Irmgard (2001-03)
    Fourteen novel sesquiterpene lactones of the germacranolide type have been isolated from the aerial parts of Mikania guaco: six costunolide, two melampolide and six germacra-4-trans,10(14),11(13)-trien-12,6α-olide derivatives. ...
  • β-Carboline monoterpenoid glucosides from Palicourea adusta 

    Valverde, Johnny; Tamayo Castillo, Giselle; Hesse, Manfred (1999)
    Lyaloside, a monoterpenoid glucoindole alkaloid, was isolated from the leaves of Palicourea adusta together with a mixture of its hydroxycinnamic acid derivatives, (E)-O-(6′)-cinnamoyl-4″-hydroxy-3″-methoxy-lyaloside and ...
  • Inhibition of granulocyte elastase activity by caffeic acid derivatives 

    Melzig, Matthias F.; Löser, B.; Lobitz, G. O.; Tamayo Castillo, Giselle; Merfort, Irmgard (1999)
    In former studies it was shown that bornyl derivates may contribute to the anti-inflamatory activity of some drugs, such as Verbesia turbacensis, Notopterygium incisum or Coreopsis mutica.
  • Potent nor-triterpenoid blockers of the voltage-gated potassium channel Kv1.3 from Spachea correae 

    Goetz, Michael A.; Hensens, Otto D.; Zink, Deborah L.; Borris, Robert P.; Morales Quirós, Juan Francisco; Tamayo Castillo, Giselle; Slaughter, Robert S.; Felix, John P.; Ball, Richard G. (1998)
    The isolation and structure elucidation of two novel nor-triterpenoid KV1.3 potassium channel blockers correolide and dehydrocorreolide from the Costa Rican tree Spachea correae are reported. The first potent and selective ...
  • Kaurene diterpenes from Mikania vitifolia 

    Lobitz, G. O.; Tamayo Castillo, Giselle; Poveda Álvarez, Luis Jorge; Merfort, Irmgard (1998)
    From the aerial parts of Mikania vitifolia three new ent-kaurane diterpenes, ent-7α-cinnamoyloxy-15β-hydroxy-kaur-16-en-19-oic acid, ent-15β-cinnamoyloxy-7α-hydroxy-kaur-16-en-19-oic acid and ent-15β-hydroxy-7α-(E)-lachn ...
  • Diterpenes and sesquitrpenes from Mikania banisteriae 

    Lobitz, G. O.; Tamayo Castillo, Giselle; Merfort, Irmgard (1997)
    Two new ent-kaurane diterpenes, 18,19-diacetoxy-ent-kaur-16-ene and 17-oxo-ent-kaur-15(16)-en-18-oic acid, were isolated from the aerial parts of Mikania banisteriae, together with the known ent-kauranes ent-kaur-16-en-18-oic ...
  • Heliangolides from Viguiera sylvatica 

    Tamayo Castillo, Giselle; Jakupovic, Jasmin; Bohlmann, Ferdinand; Castro Araya, Víctor H. (1989)
    The extract of the aerial parts of Viguiera sylvatica gave, in addition to known heliangolides, four new heliangolides related to 1-desoxyniveusin A and one to 11,13-dihydrofuroheliangolide as well as three guaianolides, ...
  • Sesquiterpene lactones and other constituents from Calea prunifolia and C. Peckii 

    Castro Araya, Víctor H.; Tamayo Castillo, Giselle; Jakupovic, Jasmin (1989)
    A re-investigation of Calea prunifolia afforded, in addition to compounds reported previously, a new eudesmanolide, a costol acetate hydroperoxide and four aromatic compounds. Calea peckii gave a large variety of aromatic ...
  • Diterpenes from Fleischmannia hymenophylla and Brickellia laciniata 

    Jakupovic, Jasmin; Tsichritzis, Fotini; Tamayo Castillo, Giselle; Castro Araya, Víctor H.; Bohlmann, Ferdinand; Boldt, E. (1989)
    The aerial parts of Fleischmannia hymenolepis gave in addition to phytol and sesamin a new derivative of beyerene named hymenophylloide. The aerial parts of Brickellia laciniata afforded several new labdane derivatives and ...
  • (+)-α-copaen-8-one and other constituents from Neomirandea species 

    Tamayo Castillo, Giselle; Jakupovic, Jasmin; Castro Araya, Víctor H.; King, Robert M. (1989)
    The investigation of five Neomirandea species gave two known entclerodanes, a heliangolide, a cadinene and a new copaene derivative as well as some widespread compounds.
  • Ent-clerodane derivatives from chromolaena connivens 

    Tamayo Castillo, Giselle; Jakupovic, Jasmin; Bohlmann, Ferdinand; King, Robert M.; Robinson, Harold E. (1989)
    The aerial parts of Chromolaena connivens afforded in addition to widespread compounds four ent-clerodane derivatives and two epimeric prostaglandin-like acids. A second species, C. turnariensis, only gave widespread ...
  • Ent-clerodane derivatives and other constituents from representatives of the subgenus ageratina 

    Tamayo Castillo, Giselle; Jakupovic, Jasmin; Bohlmann, Ferdinand; Castro Araya, Víctor H.; King, Robert M. (1989)
    Ageratina ixiocladon afforded several p-hydroxyacetophenone derivatives and diterpenes including six new ent-clerodanes. Two further species, which are also placed in the subgenus Ageratina, gave p-hydroxyacetophenone ...
  • Seco-manool and other constituents from fleischmannia microstemon 

    Tamayo Castillo, Giselle; Castro Araya, Víctor H. (1988-01)
    The aerial parts of Fleischmannia microstemon afforded in addition to sesamin and two clerodanes, ent-manoyl oxide and two derivatives of the latter, one a 6β-acetoxy derivative and the other a seco-labdane. From F. pratensis ...
  • Germacranolides and other constituents from ageratzna species 

    Tamayo Castillo, Giselle; Jakupovic, Jasmin; Bohlmann, Ferdinand; Rojas, A.; Castro Araya, Víctor H.; King, Robert M. (1988)
    The aerial parts of Ageratina anisochroma gave several thymol derivatives including five new ones, a hydroxypiperitol glucoside, some substituted benzyl benzoates and several germacranolides related to provincialin. From ...
  • Clibadiolide, a sesquiterpene lactone esterified with a homoditerpene from Clibadium pittierii 

    Tamayo Castillo, Giselle; Jakupovic, Jasmin; Bohlman, F.; Castro Araya, Víctor H. (1988)
    The aerial parts of Clibadium pittierii afforded in addition to known melampolides two new ones, one being esterified with a homoditerpenic acid and the homoditerpenic acid itself. The structures were elucidated by high ...
  • Connes' tangent groupoid and strict quantization 

    Cariñena Marzo, José F.; Clemente Gallardo, Jesús; Follana, Eduardo; Gracia Bondía, José M.; Rivero, Alejandro; Várilly Boyle, Joseph C. (1999-12)
    We address one of the open problems in quantization theory recently listed by Rieffel. By developing in detail Connes' tangent groupoid principle and using previous work by Landsman, we show how to construct a strict flabby ...
  • A nonperturbative form of the spectral action principle in noncommutative geometry 

    Figueroa González, Héctor; Gracia Bondía, José M.; Lizzi, Fedele; Várilly Boyle, Joseph C. (1998-07)
    Using the formalism of superconnections, we show the existence of a bosonic action functional for the standard K-cycle in noncommutative geometry, giving rise, through the spectral action principle, only to the Einstein ...
  • Faà di Bruno Hopf algebras 

    Figueroa González, Héctor; Gracia Bondía, José M.; Várilly Boyle, Joseph C.  (2022-11)
    This is a short review on the Faà di Bruno formulas, implementing composition of real-analytic functions, and a Hopf algebra associated to such formulas. This structure allows, among several other things, a short proof of ...
  • On summability of distributions and spectral geometry 

    Estrada Navas, Ricardo; Gracia Bondía, José M.; Várilly Boyle, Joseph C. (1998-01)
    Modulo the moment asymptotic expansion, the Cesàro and parametric behaviours of distributions at infinity are equivalent. On the strength of this result, we construct the asymptotic analysis for spectral densities arising ...

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