Browsing Escuela de Ciencias Ambientales by Title
Now showing items 1-20 of 102
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A botanical extract of Souroubea sympetala and its active principle, betulinic acid, attenuate the cortisol response to a stressor in rainbow trout, Oncorhynchus mykiss
(Elsevier, 2016-09-28)The capacity of the traditional anxiolytic plant, Souroubea sympetala, and its bioactive principle, betulinic acid (BA), to lower cortisol levels in rainbow trout, Oncorhynchus mykiss, was investigated. Effects at the level ... -
A regression analysis of Q'eqchi' Maya medicinal plants from southern Belize
(Universidad Nacional, Costa Rica, 2006)Amiguet, V.T., Department of Biology, University of Ottawa, P.O. Box 450, Ottawa, Ont. K1N 6N5, Canada; Arnason, J.T., Department of Biology, University of Ottawa, P.O. Box 450, Ottawa, Ont. K1N 6N5, Canada; Maquin, P., ... -
A Selective Ion HPLC-APCI-MS Method for the Quantification of Pentacyclic Triterpenes in an Anxiolytic Botanical Dietary Supplement for the Animal Health Market
(Natural Product Incorporation, 2019)A new anti-anxiety dietary supplement was developed for the animal health market, by combining 2 triterpene containing botanicals, Souroubea sympetala (Marcgraviaceae) with Platanus occidentalis (Platanaceae) A validated ... -
Altitudinal zonation of montane Quercus forests along two transects in Chirripó National Park, Costa Rica
(Springer, 1995-08)Abiotic and vegetation data were collected along two altitudinal transects through mature montane Quercus forests on the Pacific and Atlantic slopes of Costa Rica's Chirripó Massif. Between 2000 and 3200 m asl twenty-four ... -
Análisis de la dinámica productiva, comercial y de políticas públicas del sector forestal de Chile y Costa Rica y su impacto en la competitividad
(Universidad Nacional, Costa Rica, 2019)El sector forestal mundial muestra cambios importantes en la dinámica productiva, comercial y de políticas públicas del periodo 2006-2018. Según los resultados de este estudio en el mundo existen cerca de 3 999 millones ... -
Análisis de las denuncias ciudadanas interpuestas en el sistema integrado de trámite y atención de denuncias ambientales (SITADA) como indicador de la contaminación por olores molestos en Costa Rica
(Olores.org, 2019-11-26)Las emisiones de olores son uno de los principales problemas de contaminación ambiental en el mundo. Hecho que los coloca como contaminantes ambientales y, en consecuencia, en un tema de salud pública. El presente estudio ... -
Anti-inflammatory and antinociceptive activities of Loasa speciosa in rats and mice
(Elsevier, 2003)In the range of doses of 250–500 mgykg (given i.p.) the aqueous extract of Loasa speciosa leaves showed an inhibitory effect on leukocyte migration, and a reduction on the pleural exudate, as well as dose-dependent ... -
Antifungal Saponins from the Maya Medicinal Plant Cestrum schlechtendahlii G. Don (Solanaceae)
(Wiley, 2015-12-15)Bioassay-guided fractionation of the crude extract (80% EtOH) of the leaves of Cestrum schlechtendahlii, a plant used by Q'eqchi' Maya healers for treatment of athlete's foot, resulted in the isolation and identification ... -
Arsenic in wells at the Guayabo Caldera in Northwest Costa Rica
(International Association of Volcanology and Chemistry of the Earth's Interior, 2018-09)The Guayabo Caldera, a 14 km diameter volcanic depression with Miravalles volcano rising 2028 ma.s.l. in the norte astern side of so called, formed by repeated eruption sand multiple collapses which dis membered earlier ... -
Área foliar y período de enraizamiento para la propagación vegetativa de melina (Gmelina arborea Roxb.) en vivero, La Palma de Puerto Jiménez, Golfito
(Universidad Nacional (Costa Rica). Escuela de Ciencias Ambientales, 2016)Tesis con formato artículo científico que determina el área foliar adecuada y establece el período ´-optimo de enraizamiento en la propagaciónvegetaitva de clones superiores de Gmelina arborea dentro de túneles de ... -
Blown by the wind: the ecology of male courtship display behavior in orchid bees
(Ecological Society of America, 2017-02-01)Many insects rely on chemical signals to transmit precise information on the location, identity, and quality of potential mates. Chemical signals are often broadcasted at sites with physical properties that maximize signal ... -
Carbon accumulation in aboveground and belowground biomass and soil of different age native forest plantations in the humid tropical lowlands of Costa Rica
(Universidad Nacional, Costa Rica, 2012)Generic or default values to account for biomass and carbon accumulation in tropical forest ecosystems are generally recognized as a major source of errors, making site and species specific data the best way to achieve ... -
Carbon accumulation in the biomass and soil of different aged secondary forests in the humid tropics of Costa Rica
(Elsevier, 2011-10-15)Efforts are needed in order to increase confidence for carbon accounts in the land use sector, especially in tropical forest ecosystems that often need to turn to default values given the lack of precise and reliable site ... -
Chemical characterization of filterable PM2.5 emissions generated from regulated stationary sources in the Metropolitan Area of Costa Rica
(Elsevier, 2017-01-14)Filterable PM2.5 concentrations and their chemical characterizations were analyzed for 67 boilers and 25 indirect furnaces located in the Metropolitan Area of Costa Rica from February 2014 to November 2015. The PM2.5 samples ... -
Climatic and edaphic controls over tropical forest diversity and vegetation carbon storage
(Springer Nature, 2020-03-19)Tropical rainforests harbor exceptionally high biodiversity and store large amounts of carbon in vegetation biomass. However, regional variation in plant species richness and vegetation carbon stock can be substantial, and ... -
Clinical observations and safety profile of oral herbal products, souroubea and platanus spp: a pilot-toxicology study in dogs
(Universidad Nacional, Costa Rica, 2014-04-07)This pilot-study evaluated the toxicity and safety profi le of two herbal products Souroubea spp Botanical Blend (SSBB) and Platanus Tree Bark (PTB) after oral administration to dogs at elevated doses for 28 days. SSBB and ... -
Comparaciones de las emisiones de gases efecto invernadero para dos tecnologías de tratamiento de residuos de pulpa de café en Costa Rica
(Universidad Nacional (Costa Rica). Escuela de Ciencias Ambientales, 2018)Realiza una comparación de las emisiones de gases efecto invernadero generadas en dos sistemas de tratamiento de pulpa residual de café: el compostaje y la gasificación. Asimismo, evalúa el desempeño de este material como ... -
Concentration of PM10 in the Metropolitan Area of Costa Rica, Central America: chemical composition and potential sources
(Universidad Nacional, Costa Rica, 2010)Measurements of metals and inorganic ions were carried out on PM10. Sampling was made in five sites distributed in San José, Heredia and Belén cities. Samples were collected using Thermo Andersen PM10 high volume samplers ... -
El consumo de madera local en Costa Rica
(Universidad Nacional (Costa Rica). Escuela de Ciencias Ambientales, 2017)El uso de la madera local en Costa Rica ha venido en descenso durante los últimos 10 años. Por esta razón, este estudio se enfoca en el análisis de los principales aspectos que inciden en el consumo de este material en ... -
Control de calidad de madera en pie y madera aserrada para el mercado de construcción del Grupo Empresarial El Almendro
(Universidad Nacional (Costa Ria). Escuela de Ciencias Ambientales, 2017)El Grupo Empresarial El Almendro busca mejorar la integración de la producción para alcanzar mayor competitividad en el mercado nacional. Para poder lograrlo, se requiere poder encadenar los principales eslabones de la ...
