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Now showing items 11-16 of 16
Escrutinio optimizado de amplio espectro cualitativo y alternativo de aplicación forense por HPLC/ DAD para drogas y medicamentos
(Universidad Nacional (Costa Rica), 2011-10)
Con el desarrollo de este trabajo, se implementó un método de escrutinio de amplio espectro de drogas y medicamentos, utilizando cromatografía líquida de alta resolución (HPLC), con detector de arreglo de diodos (DAD), el ...
Chemical constituents from Zanthoxylum setulosum (Rutaceae)
(Universidad Nacional, Costa Rica, 2011-02-10)
Following our phytochemical studies of Costa Rican plants, in this work we report the isolation and identification of eight compounds from aerial parts of Zanthoxylum setulosum (Rutaceae). They were identified as the ...
Determinación de la utilidad de polipropileno reutilizado como matriz de un material compuesto con fibra de rastrojo de piña (Ananas Comusus) y un agente compatibilizante
(Universidad Nacional (Costa Rica), 2011-03)
El uso de una gran cantidad de materiales plásticos posteriormente convertidos en desechos, ocasiona un grave problema de contaminación a nivel mundial y nuestro país no es la excepción. Por otro lado, las industrias en ...
Seasonal and Diel Patterns of Total Gaseous Mercury Concentration In Atmospheric Air of the Central Valley of Costa Rica
(2011)
Monitoring mercury in atmospheric air near volcanoes is limited with no previous data for Costa Rica. Seasonal and daily patterns of total gaseous mercury (TGM) were observed at our main sampling location at the Universidad ...
First Measurements of Biogenic Hydrocarbons in Air in a Tropical Cloudy Forest, Monteverde, Costa Rica
(David Publishing Compan, 2011)
Measurements of biogenic hydrocarbons in ambient air were carried out during 2008 in a cloud y tropical forest in Monteverde, Costa Rica. Isoprene, α-pinene, β-pinene, 3-carene, d-limonene and γ-terpinene were sampled by ...
Analysis of energy transfer and ternary non-covalent filler/matrix/UV stabilizer interactions in carbon nanofiber and oxidized carbon nanofiber filled poly(methyl methacrylate) composites
(Elsevier, 2011-10-27)
Ternary non-covalent interactions between carbon nanofibers (CNFs), oxidized carbon nanofibers (ox-
CNFs), poly(methyl methacrylate) (PMMA) chains, and benzotriazole-containing UV stabilizers were
analyzed using ...