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Mostrando ítems 3097-3106 de 3106

    • x Cochlezella costaricensis, a name for a rare natural hybrid in the Zygopetalinae (Orchidaceae) 

      Pupulin, Franco (2015)
      A new nothospecies in the subtribe Zygopetalinae (Orchidaceae), × Cochlezella costaricensis, representing a cross between Cochleanthes aromatica and Warczewiczella discolor, is described and illustrated from Costa Rica, ...

    • Xantismo en peces cíclidos (Cichliformes: Cichlidae) costarricenses, y variación ontogenética en Parachromis dovii 

      San Gil-León, Jorge; Angulo Sibaja, Arturo (2021)
      Introducción: El xantismo o xantocromismo es una anomalía fenotípica que se evidencia por la producción predominante de xantina, un pigmento que le da al organismo una coloración amarillenta. En Costa Rica existen pocos ...

    • XIX Simposio Internacional de Métodos Matemáticos Aplicados a las Ciencias 

      Trejos Zelaya, Javier; Villalobos Arias, Mario Alberto; Barboza Chinchilla, Luis Alberto (2014-05-02)
      El XIX° Simposio Internacional de Métodos Matemáticos Aplicados a las Ciencias (XIX SIMMAC) es el evento de matemática aplicada más importante de América Central. Es organizado por el Centro de Investigación en Matemática ...

    • Xylobium Lindl. 

      Bogarín Chaves, Diego Gerardo; Pupulin, Franco (2022)
      Xylobium derives from the Greek words xylon, wood, and bios, life, meaning “life on the wood or tree”. Though, it seems contradictory that Lindley chose a name referring to the epiphytic habit of the plant because the ...

    • Zilber's Dichotomy for Differentially Closed Fields with an Automorphism 

      Bustamante Medina, Ronald F. (2020-07-01)
      The theory of difference-differential fields of characteristic zero hasa model-companion denoted byDCFA. In [2] we prove its main properties. In[3] we proved a weak version of Zilber’s dichotomy forDCFA. In this paperwe ...

    • ZOOTROPHION Luer 

      Pupulin, Franco; Rojas Alvarado, Gustavo (2022-08)
      Se presenta una reseña del género Zootrophion en Costa Rica y se incluyen fotografías de todas las especies presentes en el país. Además se describe una nueva especie para el país.

    • Zygopetalinae novae et criticae (Orchidaceae) 

      Pupulin, Franco (2019)
      The new genus Pridgeonia, and eight new orchid species in the genera Benzingia, Daiotyla, Dichaea, Ixyophora, and Pridgeonia, all belonging to the subtribe Zygopetalinae, are described. Complete descriptions, with notes ...

    • (+)-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.

    • 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 ...

    • μ2-Chlorido-chlorido­(μ2-4-{[2-(di­ethyl­amino)­eth­yl]imino}­pent-2-en-2-olato)bis­(tetra­hydro­furan-κO)cobalt(II)lithium 

      Vinocour Pacheco, Felipe Andrés; Soto Navarro, Andrea; Pineda Cedeño, Leslie William (2018)
      The crystal structure of the title compound, [CoLi(C11H21N2O)Cl2(C4H8O)2], has monoclinic symmetry and comprises one heterometallic binuclear complex mol­ecule in the asymmetric unit. The Co2+ cation is bonded to one oxygen ...