Search
Now showing items 71-80 of 104
Characterization and applications of silver nanoparticles-decorated electrospun nanofibers loaded with polyphenolic extract from rambutan (Nepelium lappaceum)
(Elsevier B.V., 2020-05)
Rambutan (Nephelium lappaceum) is a traditional fruit originally from Asia and now widely available in Central America. The rind of rambutan is rich in antioxidants, especially polyphenols, which have natural anti-inflammatory ...
A methane sink in the Central American high elevation páramo: Topographic, soil moisture and vegetation effects
(Elsevier B.V., 2020-03-15)
Methane (CH4) is a strong greenhouse gas with a global warming potential 23 times larger than that of carbon dioxide. Characterizing ecosystems as either sources or sinks for methane and their magnitudes informs on biosphere ...
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), ...
Electrospun nanofibers: A nanotechnological approach for drug delivery and dissolution optimization in poorly water-soluble drugs
(International Association of Physical Chemists, 2020)
Electrospinning is a novel and sophisticated technique for the production of nanofiberswithhigh surface area, extreme porous structure, small pore size, and surface morphologies that make them suitable ...
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, ...
Nanochitin: Chemistry, Structure, Assembly, and Applications
(ACS Publications, 2022)
Chitin, a fascinating biopolymer found in living organisms, fulfills current demands of availability, sustainability, biocompatibility, biodegradability, functionality, and renewability. A feature of chitin is its ability ...
Phytonutraceutical evaluation of five varieties of tomato (Solanum lycopersicum) during ripening and processing
(Elsevier, 2022-07-15)
Tomato (Solanum lycopersicum) is the largest produced vegetable in the world after potato and sweet potato. It is
an important source of carotenoids (mainly lycopene), ascorbic acid, and phenolic compounds. In this work, ...
Estudio de la variabilidad en la concentración de los alcaloides emetina, cefaelina y totales, presentes en la raíz de Carapichea ipecacuanha en diferentes estados de maduración, con la finalidad de optimizar el tiempo de cosecha y su potencial actividad antibiótica
(Universidad Nacional (Costa Rica), 2022)
En años recientes ha aumentado el interés de la población de la zona norte de nuestro país en la siembra y exportación de la famosa raicilla (C. ipecacuanha). Esta planta medicinal es exportada a Europa y su precio depende ...
Caracterización física, química y microbiológica del agua en el acuífero Poás para el establecimiento de una relación con las zonas de vulnerabilidad a la contaminación hidrogeológica
(Universidad Nacional (Costa Rica), 2022)
El desarrollo urbano y agrícola en la parte alta de la cuenca del río Poás ocasionado en los últimos años aumenta el riesgo a la contaminación de las principales zonas de recarga de este acuífero. Con el fin de asegurar ...
Modificación y validación de una metodología para plaguicidas organofosforados por Quechers–gc/msd-ei en cerveza y jugo de manzana
(Universidad Nacional (Costa Rica), 2022)
En Costa Rica, el Código Penal (Ley N° 4573) tipifica los delitos contra la vida, y la Ley de Bienestar Animal (Ley N° 7451) tipifica como delito los actos crueles, maltratos o muerte ocasionada de animales.7,8 En algunos ...