Browsing Artículos científicos by Title
Now showing items 21-40 of 237
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Antioxidant and antimicrobial activity of two Costa Rican cultivars of ber (Ziziphus mauritiana): An underexploited crop in the American tropic
(Wiley Periodicals LLC, 2023-03-17)Ber is an antioxidant-rich fruit from Asia and has recently been cultured in Central America. The antioxidant capacity and antimicrobial activity of Z. mauritiana cultured of bers from Guanacaste, Costa Rica, were evaluated. ... -
Aplicación de un método para evaluar el impacto ambiental de proyectos de construcción de edificaciones universitarias
(2016)La evaluación de impacto ambiental consiste en la identificación y valoración de los impactos potenciales de proyectos respecto a los componentes físicos, químicos y biológicos, culturales, económicos y sociales, con el ... -
Aporte ambiental de la planta de tratamiento de aguas residuales Los Tajos en la remoción de contaminantes fisicoquímicos y microbiológicos
(Universidad Nacional, Costa Rica, 2022-01-31)The objective of the study was to analyze the environmental contribution, in terms of removal of physicochemical and microbiological pollutants, from the Los Tajos Wastewater Treatment Plant (WWTP) to the Torres River. ... -
Application of a Sulfur Removal Hydrometallurgical Process in a Lead-Acid Battery Recycling Plant in Costa Rica
(Scientific Research Publishing Inc., 2017)This study presents the implementation of a desulphurization process for lead recycling under different chemical and physical conditions using pyro-metallurgical processes. Desulphurization was done using a hydrometallurgical ... -
Aprovechamiento de la yuca amarga Manihot esculenta Crantz ) para la extracción de almidón y la producción de un material termoplástico (TPS)
(Universidad Nacional (Costa Rica), 2019)La versatilidad de los materiales poliméricos derivados de hidrocarburos fósiles ha beneficiado el desarrollo industrial, sin embargo, han ocasionado efectos adversos sobre el medio ambiente. Para minimizar estas consecuencias ... -
Arsenate removal by chitosan iron oxyhydroxide beads: Preparation, characterization, and adsorption studies
(Desalination Publications, 2021)This study compared arsenic removal from drinking water by two different adsorbents: iron-im-pregnated chitosan beads (Fe-ICB) and iron-doped chitosan beads (Fe-dCB). Scanning electron microscopy, X-ray diffraction (XRD), ... -
Arthropod biodiversity loss and the transformation of a tropical agro-ecosystem
(Chapman & Hall, 1997)The coffee (coffea arabica) agro-ecosystem in the Central Valley of Costa Rica was formerly characterized by a high vegetational diversity. This complex system has been undergoing a major transformation to capital-intensive ... -
Aspectos del contexto socioambiental que inciden en la contaminación del recurso hídrico en un cantón urbano
(Universidad Nacional (Costa Rica), 2021-07-01)El objetivo fue identificar y analizar los aspectos más relevantes del contexto socioambiental de un cantón urbano, que inciden en la contaminación del recurso hídrico. Se realizó una investigación descriptiva con un ... -
Ácido l-poliláctico (Pla) y nanotubos de carbono de pared múltiple (ntcpm) con potenciales aplicaciones industriales
(Universidad Nacional de Colombia, 2021)En términos generales, es bien conocida la cualidad que poseen algunos polímeros de cambiar sus propiedades físicas y químicas finales mediante la adición de nanopartículas a la matriz polimérica para producir un ... -
Ácido L-poliláctico (PLA) y nanotubos de carbono de pared múltiple (NTCPM) con potenciales aplicaciones industriales
(Universidad Nacional (Colombia), 2021)En términos generales, es bien conocida la cualidad que poseen algunos polímeros de cambiar sus propiedades físicas y químicas finales mediante la adición de nanopartículas a la matriz polimérica para producir un ... -
Base de datos sobre la calidad del agua superficial en río Bermúdez
(Universidad Nacional (Costa Rica), 2021-06-21) -
Baseflow recession analysis in the inland Pacific Northwest of the United States
(Springer Nature, 2015)The storage-discharge relationships of 26 water sheds in the inland Pacific Northwest of the United States were analyzed. Four fitting methods were used to obtain the baseflow coefficients: lower envelope, organic corre ... -
Bayesian estimates of the mean recharge elevations of water sources in the Central America region using stable water
(Elsevier, 2020)Study region: Central America. Study focus: Knowledge of the mean recharge elevation (MRE) of water resources is important where water resources are vulnerable. The purpose of this study was to develop and apply a Bayesian ... -
Biocomposite Films of Polylactic Acid Reinforced with Microcrystalline Cellulose from Pineapple Leaf Fibers
(Tech Science Press, 2019)Poly(lactic acid) (PLA) composite films reinforced with microcrystalline cellulose (MCC) extracted from pineapple leaf fibers (PALF) were prepared by a solution casting procedure. In an attempt to improve the interaction ... -
Biodegradable polyurethanes from sugar cane biowastes
(Cellulose chemistry and technology, 2011)In a previous work, it was demonstrated that 70% of the molasses isolated from the biowaste generated by the agro-industrialization of sugar cane allow obtaining composite materials with adequate mechanical properties ... -
Biofabrication of Gold Nanotriangles Using Liposomes as a Dual Functional Reductant and Stabilizer
(American Chemical Society, 2021-03-23)Negatively charged liposomes accomplished both functions as a reducing and stabilizing agent in the synthesis of gold nanotriangles (GNTs). Liposomes are based on a mixture of phospholipids phosphatidylcholine/phosphoglycerol, ... -
Biogardens as constructed wetlands in tropical climate: A case study in the Central Pacific Coast of Costa Rica
(Elsevier, 2019-03-25)In Costa Rica, <10% of wastewater is treated before its discharge. This generates a significant impact on the environment, public health, and tourism industry, which is one of the country's main economic activities. ... -
Biogenic silica-based microparticles obtained as a sub-product of the nanocellulose extraction process from pineapple peels
(Nature Publishing Group, 2018-07-10)Silica in plant tissues has been suggested as a component for enhancing mechanical properties, and as a physical barrier. Pineapples present in their shell and bracts rosette-like microparticles that could be associated ... -
Bioguided Phytochemical Study of Ipomoea cairica Extracts with Larvicidal Activity against Aedes aegypti
(MDPI, 2022-02-16)Vector-borne diseases, such as those transmitted by Aedes aegypti, are a constant threat to inhabitants of tropical regions of the planet. Synthetic chemicals are commonly used as a strategy to control them; however, ... -
Biosensors for the Detection of Bacterial and Viral Clinical Pathogens
(MDPI AG, 2020-12-04)Biosensors are measurement devices that can sense several biomolecules, and are widely used for the detection of relevant clinical pathogens such as bacteria and viruses, showing outstanding results. Because of the latent ...