Escuela de Química: Recent submissions
Now showing items 1-20 of 28
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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 ... -
Chirripó Hydrological Research Site: advancing stable isotope hydrology in the Central American Páramo
(2020-01-25)The Chirripó Hydrological Research Site (CHRS) is located within the Chirripó National Park, Costa Rica (between 3,100-3,820 m asl) whereby ~100 km2 are covered by Páramo, a high‐elevation tropical grassland ecosystem. A ... -
Procesos de innovación en centros de investigación: casos de éxito en LANOTEC CENAT CONARE
(National Nanotechnology Laboratory, LANOTEC CENAT CONARE, Costa Rica. Polymer Laboratory, POLIUNA, National University, Costa Rica, 2020) -
Matrices biodegradables basados en Quitosano para la formulación de nuevos productos
(Laboratorio de Ciencia y Tecnología de Polímeros. POLIUNA, 2020) -
Obtención de productos de valor agregado a partir de desechos de café
(Universidad Nacional, Costa Rica, 2020) -
An anatomical comparison between bunch and fruit of oil palm with pineapple leaf and three woods from plantations in Costa Rica
(Journal of Oil Palm Research, 2013-04)Elaeis guineensis, Ananas comusus and forest plantations are planted widely in Costa Rica; however their residues (8000 t) are not utilised. The main objective of this work was to undertake an anatomical description of the ... -
Scattering of light by colloidal aluminosilicate particles Produces the unusual sky-blue color of Río Celeste (Tenorio Volcano Complex, Costa Rica)
(2013-09-18)Río Celeste (Sky-Blue River) in Tenorio National Park (Costa Rica), a river that derives from the confluence and mixing of two colorless streams-Río Buenavista (Buenavista River) and Quebrada Agria (Sour Creek)-is renowned ... -
Desarrollo de un producto tópico de uso veterinario con propiedades analgésicas, a partir de capsaicina extraída de Capsicum annum
(Universidad Nacional, Costa Rica, 2007)Una de las actividades agrícolas importantes a nivel mundial es la siembra del pimiento, el cual tiene características agronómicas muy importantes, tales como la buena adaptación al medio local, excelente conservación y ... -
Determinación de hidrocarburos biogenéticos en aire en el bosque nuboso Monteverde, Costa Rica
(Universidad Nacional, Costa Rica, 2009)Determina la concentración de los hidrocarburos biogénicos en aire en el Bosque Nuboso de la Reserva Biológica Monteverde, Costa Rica. Se implementó la metodología analítica para la determinación de las concentraciones de ... -
The manufacture and properties of oil palm and pineapple leaf fiberboard panels
(WIT Transactions on Ecology and the Environment, 2014)Particleboards were manufactured from oil palm fruit, the oil palm mesocarp fiber of Elaeis guineensis, the leaves of pineapple (Ananas comosus) and the sawdust from three fast-growing species of trees (Gmelina arborea, ... -
First measurements of methyl tert-butyl ether (MTBE) in the ambient air in San Jose, Costa Rica
(2014)A great interest has arisen in establishing the impact of organic compounds on human health and air quality, especially those compounds emitted by automotive traffic. Knowledge of urban air pollutant concentrations is ... -
Determinación de éter metil terc-butílico (MTBE) en el aire de San José, Costa Rica
(Universidad Nacional, Costa Rica, 2006)Contribuye a la calidad del aire de la ciudad de San José y al mejoramiento de la salud pública mediante la determinación de la concentración de éter metil terc-butílico en el aire de la ciudad de San José. Se realizaron ... -
Lead acid battery recycling in Costa Rica: A case study
(WIT Transactions on Ecology and the Environment, 2012)This work describes the production of secondary lead in a smelter located in Costa Rica. The only input of the plant is scrap automotive batteries. We describe the environmental management strategies used for waste ... -
Isotope hydrology and baseflow geochemistry in natural and human-altered watersheds in the Inland Pacific Northwest, USA
(2015-02-18)This study presents a stable isotope hydrology and geochemical analysis in the inland Pacific Northwest (PNW) of the USA. Isotope ratios were used to estimate mean transit times (MTTs) in natural and human-altered watersheds ... -
Synthesis of Dihydroindolo[2,3-c]carbazole as Potential Telomerase Inhibitor
(Journal of Heterocyclic Chemistry vol.53 no.3 762-766 2015, 2015-05-27)The dictyodendrins A-E were the first marine natural products that show inhibition of telomerase. A versatile and convergent route was described for the synthesis of derivatives of these pyrrolo[2,3-c]carbazole alkaloids ... -
Physical, mechanical and hydration kinetics of particleboards manufactured with woody biomass (Cupressus lusitanica, Gmelina arborea, Tectona grandis), agricultural resources, and Tetra Pak packages
(Waste Management and Research vol.32 no.2 106-114 2014, 2014-02-11)Lignocellulosic wastes resulting from agricultural activities as well as Tetra Pak residues from urban centres can cause significant levels of pollution. A possible action to minimize this problem is to use them in the ... -
Orientation effect in poly (butylene succinate) fibers
(Polymers & Polymer Composites vol.11 no.1 51-56 2003, 2003)Fibers of poly (butylene succinate) (PBS) were prepared using a single screw extruder at various take-up speeds. Changes in fiber structure, morphology and physical properties were investigated using sonic velocity ... -
Isomerization of fatty acids: A cellular barrier mechanism in nanotechnology?
(Journal of Nanoscience and Nanotechnology Vol.17 1-9, 2017-01)This work is a kinetic study of the coupling reaction of 2-mercaptoethanol with methyl undecenoate and with methyl oleate through " click " chemistry. Reversibility and reactivity of each system were followed through Fourier ... -
Recovery of acetate by anion exchange with consecutive CO2-expanded methanol desorption: A model-based approach
(Elsevier BV, 2018-04-07)Production of bio-based acetate is commonly hindered by the high costs of the downstream processing. In this paper, a model is developed to describe a new method that recovers acetate salts using anion exchange resins, and ... -
Characterization of surface water isotope spatial patterns of Scotland
(Elsevier B.V., 2018-07-24)The extended National Waters Inventory of Scotland (NWIS) monitoring network in combination with an extensive, supplementary low flow sampling campaign was used to create isoscapes of surface water for management purposes ...
