Browsing Química by Title
Now showing items 36-55 of 156
-
Desarrollo de una metodología tropicalizada de gestión de la calidad orientada a las funciones administrativas que se ejecutan en la Escuela de Química de la Universidad de Costa Rica
(2019)El presente trabajo de investigación surge como una necesidad aparente que tienen las universidades (e instituciones públicas en general) por contar con una metodología de mejora sistemática, eficiente, de alta calidad y ... -
Design of an optimized biomixture for the degradation of carbofuran based on pesticide removal and toxicity reduction of the matrix
(2015-12)Pesticide biopurification systems contain a biologically active matrix (biomixture) responsible for the accelerated elimination of pesticides in wastewaters derived from pest control in crop fields. Biomixtures have been ... -
Detection of the adsorption of water monolayers through the ion oscillation frequency in the magnesium oxide lattice by means of low energy electron diffraction
(2016-03)We investigate the variation of the oscillation frequency of the Mg2+ and O2− ions in the magnesium oxide lattice due to the interactions of the surface with water monolayers by means of Low Energy Electron Diffraction. ... -
Direct functionalization of Mn12-(methacrylate) clusters on Si(100): surface characterization and electrochemical properties
(2016-09)The reaction of H–terminated Si(100) with methacrylate–substituted manganese carboxylate clusters [Mn12O12{CH2C(CH3)COO}16(H2O)4], [Mn12–(methacrylate)] via hydrosilylation afforded Mn12–(methacrylate)−Si(100). The chemically ... -
Dye‐sensitized Devices: Photovoltaic and Photoelectrolytic Applications
(2018-11)Dye‐sensitized approach along with stability and surface robustness in titanium dioxide (TiO2) against photocorrosion and degradation has been widely studied and applied in several important applications. This chapter ... -
Ecotoxicological analysis during the removal of carbofuran in fungal bioaugmented matrices
(2016-02)Biomixtures are used for the removal of pesticides from agricultural wastewater. As biomixtures employ high content of lignocellulosic substrates, their bioaugmentation with ligninolytic fungi represents a novel approach ... -
Efficient syntheses of streptocarpone and (±)-a-dunnione
(2007)An efficient divergent synthesis of both streptocarpone and racemic α-dunnione from lawsone are described. A one-pot, formal [3+2] cyclization to form a furanonaphthoquinone directly provided a common intermediate. -
Essential oil from leaves of Myrcianthes fragrans (Myrtaceae) from Costa Rica. A new chemotype?
(2017)Myrcianthes is a Myrtaceous genus of flowering plants of about 30 to 40 species, distributed in the American continent. The aim of this work was to study the chemical composition of the foliar essential oil from M. fragrans ...