Browsing Química by Title
Now showing items 90-109 of 360
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Desarrollo y verificación de metodologías electroquímicas para la determinación de antimonio, plomo y otros componentes orgánicos presentes en residuos de disparo
(2022)El análisis de residuos de disparo tanto inorgánicos como orgánicos, presentes en escenas del crimen, ha sido uno de los problemas más complicados en la ciencia forense debido a que la cantidad de muestra es muy limitada ... -
Design and synthesis of n-[3-(3-oxoprop-1-yn-1-yl) phenyl] benzene sulfonamide: a highly active antimicrobial compound
(2019)The synthesis of the highly active compound N-[3-(3-oxoprop-1-yn-1-yl)phenyl] benzene sulfonamide was performed and its activity against Gram (+), Gram (-), mold and yeast was determined. -
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. ... -
Determinación colorimétrica de hierro en agua potable mediante la utilización de imágenes obtenidas con el teléfono celular
(2023-03-09)La colorimetría de imágenes digitales se basa en la extracción de coordenadas de color de imágenes captadas con dispositivos como: escáneres, cámaras digitales y teléfonos celulares. El hierro es uno de los elementos más ... -
Determinación de plaguicidas organoclorados en leche materna en Costa Rica
(1984)DDT and DDE We[e detected in the milk of 51 nursing mothers in Costa Rica. In the provinces of Puntarenas, Guanacaste and Limón, where a campaign against malaria taok place during the last thrce decades and where CJops ... -
Determination of acetate and formate in vegetable oils by ion chromatography after multivariate optimization of the extraction process using a Doehlert design
(2018)In this work, we present the development of a method for the determination of acetate and formate in vegetable oils by ion chromatography with conductometric detection following their extraction from samples using a diluted ... -
Determination of adulterants of cocaine in Real banknotes in Brazil by HPLC-DAD
(2022)Cocaine is a tropane alkaloid extracted from coca leaves, a common bush found in Andean regions of South America. Many medicines are added to the final product to increase the profits, keeping similar or higher effects ... -
Determination of the process variables for adsorption and desorption of phosphate from wastewater by selective ion exchangers on magnetic particles
(2015-08-04)In this study different process variables were evaluated for the adsorption and desorption of phosphate from wastewater by using selective ion exchangers with magnetic particles modi-fied with layered double hydroxides ... -
Development of an extraction method for the determination of inorganic anions (chloride, sulfate and phosphate) in edible oils from different origins by ion chromatography
(2018)The present work reports the development of ion chromatography conductivity based detection analytical method for the determination of some inorganic anions (chloride, sulfate and phosphate) in vegetable oils. The analytes ... -
Differential volatile organic compound expression in the interaction of Daldinia eschscholtzii and Mycena citricolor
(2023)Fungi exhibit a wide range of ecological guilds, but those that live within the inner tissues of plants (a.k.a. endophytes) are particularly relevant due to the benefits they sometimes provide to their hosts, such as ... -
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 ... -
Diseño de una emulsión Pickering fotoactiva
(2023)Las emulsiones Pickering constituyen un tipo de emulsión estabilizada mediante partículas sólidas en lugar de los convencionales agentes emulsificantes moleculares. Aunque fueron conceptualizadas hace más de un siglo, su ... -
Diterpenes and sesquitrpenes from Mikania banisteriae
(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 ...