Browsing Escuela de Química by Title
Now showing items 49-68 of 475
-
Aprovechamiento de los residuos de piña para la producción de celulosa nanofibrilar (NFC) y nanocelulosa cristalina (NCC)
(Universidad Nacional (Costa Rica), 2019)Los residuos generados a partir de la siembra de piña en Costa Rica, se consideran un problema, debido a su lenta degradación y la utilización de agroquímicos para desecarla en campo. La producción de este cultivo se ha ... -
Aprovechamiento del aceite de Tilapia como desecho obtenido en la producción de carne de Tilapia (Oreochromis sp) : un estudio piloto para la obtención de ácido omega-3 a partir del aceite de tilapia
(Universidad Nacional (Costa Rica), 2014-04)Se analizaron nueve muestras de aceite de Tilapia generadas en la producción de harina de Tilapia a partir de los desechos de cabezas, colas, espinas, aletas, vísceras y huesos generados en el proceso de producción de carne ... -
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 ... -
Bioengineered Scaffolds for Thermo-responsive Drug Delivery in Wound Healing
(Multidisciplinary Digital Publishing Institute (MDPI) (Suiza), 2020)Innate and adaptive immune responses lead to wound healing by regulating a complex series of events promoting cellular cross-talk. An inflammatory response is presented with its characteristic clinical symptoms: heat, ... -
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, ... -
Bioprocess Development of an Extremophilic Methanotroph and Microalgae Coculture for the Production of a Novel Proteinaceous Biofeed
(University of Canterbur, 2022) -
Bioprospección fitoquímica de dos variedades de fruta de cas (Psidium friedrichsthalianum Ndz y Psidium guineense Sw) oriundas de Costa Rica
(Universidad Nacional (Costa Rica), 2014-10)Las plantas han sido la base para la cura de enfermedades desde épocas antiguas, en donde el hombre a través del tiempo ha buscado respuesta a la necesidad de vivir en condiciones óptimas de salud y vida aceptables. Conforme ... -
Biorefinería de los subproductos agrícolas de ñame (Dioscorea alata): Obtención de fructanas con potencial aplicación en la industria alimentaria
(Universidad del País Vasco (España), 2020-11)La actividad agrícola de Costa Rica es de vital importancia para el desarrollo económico del país. Recientemente, este sector ha incrementado su presencia con los cultivos no tradicionales, como las raíces y tubérculos, ...