Browsing Artículos científicos by Title
Now showing items 178-197 of 254
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Nanobiodiversity and Biomimetic Adhesives Development: From Nature to Production and Application
(Scientific Research Publishing (China), 2019)Advances in science and technology, especially in bioprospecting and biomimetics, have provided solutions to everyday problems over time. Through bioengineering, research and the discovery of the mechanisms present in ... -
Nanobiotechnology in Agricultural Sector: Overview and Novel Applications
(Scientific Research Publishing (China), 2019)The agricultural sector has many problems achieving the desired yield in products because of pathogens, viruses, pesticides, herbicides, temperature, soil moisture, among others. Nanotechnology, along with other sciences, ... -
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 ... -
Nanoestructuras de Silicio en Biomedicina y Biotecnología
(Universidad Nacional (Colombia), 2020)Actualmente ha crecido el interés por la fabricación y caracterización de nanoestructuras de silicio, entre las que se incluye nanohilos, pilares, tubos, conos, partículas, etc; existiendo diversos métodos para generar ... -
National Inventory of Mercury Release into Different Environmental Sectors Estimated by United Nations Environment Programme (UNEP) Toolkit in Costa Rica
(United Nations Environment Programme (UNEP) Toolkit, 2017)This paper summarizes the national inventory of mercury released into all environmental sectors (air, water, land, impurity in products, general wastes and sector specific treatment/disposal) for the year 2008 in the country ... -
Near Surface Carbon Dioxide and Methane in Urban Areas of Costa Rica
(Scientific Research Publishing (China), 2015)Little information is available for Central America regarding methane and carbon dioxide mixing ratios in urban areas. This work reports a representative spatial and seasonal study of near surface carbon dioxide and ... -
Neutralización del efceto hemorrágico inducido por veneno Bothrops asper (Serpentes: Viperidae) por extractos de las plantas tropicales
(Universidad Nacional (Costa Rica), 1999)Organic extracts representing 48 species included in 30 families of Costa Rican tropical plants were evaluated for their hability to neutralize hemorrhagic acfivity lnduced by the venom of the snake Bothrops aspero Abioassay ... -
New advances in the method validation, extraction methods and measurement uncertainty for the determination of water-soluble hexavalent chromium in hydraulic cemen
(Elsevier, 2021)The quantification of Cr (VI) in the cement matrix is highly important, given the possibility of suffering illnesses including dermatitis, induced nasal carcinoma, and DNA damage produced by inhalation of and/or direct ... -
New advances in the method validation, extraction methods and measurement uncertainty for the determination of water-soluble hexavalent chromium in hydraulic cement
(Elsevier Ltd, 2021-04-20)The quantification of Cr (VI) in the cement matrix is highly important, given the possibility of suffering illnesses including dermatitis, induced nasal carcinoma, and DNA damage produced by inhalation of and/or direct ... -
New Botanical Anxiolytics for Use in Companion Animals and Humans
(Springer (Alemania), 2017-11)As part of our ongoing research into botanical therapies for anxiety disorders, the neotropical vine Souroubea sympetala was chosen for study as a phytochemical discovery strategy focusing on rare Central American plant ... -
Nitrate Legacy in a Tropical and Complex Fractured Volcanic Aquifer System
(John Wiley & Sons (Estados Unidos), 2023)Nitrate legacy is affecting groundwater sources across the tropics. This study describes isotopic and ionic spatial trends across a tropical, fractured, volcanic multi-aquifer system in central Costa Rica in relation to ... -
Nonirritant and Cytocompatible Tinospora cordifolia Nanoparticles for Topical Antioxidant Treatments
(Hindawi (Egipto), 2020)Tinospora cordifolia extract contains antioxidants such as polyphenols, and thus, it has been used as a natural phytochemical antioxidant therapeutic agent. Many of these compounds are insoluble or only partially soluble ... -
Nutraceuticals: definition, applied nanoengineering in their production and applications
(MedCrave Group (Estados Unidos), 2019)Background: Nutraceuticals can be defined as nutritional components that provide therapeutic or physiological benefits beyond the basic nutritional needs and include a wide range of compounds. However, they show very low ... -
Nutritional and bioactive composition of Spanish, Valencia, and Virginia type peanut skins
(Academic Press Inc., 2021-01-21)The aims of this study were to determine the proximate and amino acid compositions, mineral content, and fatty acid and proanthocyanidins (PAC) profiles of peanut skins (PS) from three varieties of peanuts. Proximate ... -
Obtención de acetato de celulosa a partir de desechos agroindustriales
(Universidad Nacional [Costa Rica], 1989-01-01)El propósito del presente trabajo fue encontrar usos alternativos para los residuos agrícolas. Se realizó la acetilación de celulosa de cáscara de piña, cáscara de arroz y aserrín. La reacción de acetilación se llevó a ... -
Obtención de lignina y celulosa de residuos de maíz
(Universidad Nacional, Costa Rica, 1992-01-01)Mediante un método de pulpeo sencillo se obtuvo la lignina y la celulosa de tusa y olote de maíz con buenos rendimientos. Los estudios de termogravimetría mostraron que estas ligninas son térmicamente menos estables que ... -
Obtención de xilosa a partir de desechos lignocelulósicos de la producción y proceso industrial de la piña (Ananascomusus)
(Universidad Nacional (Costa Rica), 2012)Los desechos lignocelulósicos de la producción de piña son una materia prima muy útil para la producción de xilosa por medio de hidrólisis, que a su vez, puede convertirse a xilitol. El objetivo de este trabajo fue ... -
Obtención potencial de polímeros biodegradables. Estudio de la disolución de la cáscara de piña en PEG
(Universidad Nacional (Costa Rica), 1995-10-27)Se determinaron las condiciones para disolver la cáscara de piña en polietilénglicol 400. Se utilizó un tamaño de partícula entre 125 y 150 micrómetros, una relación 1/1 en peso de sustrato/PEG, temperatura 225°C y un ... -
On the comparison between diafiltration and isothermal titration calorimetry: Determination of the amount of analytes bound to watersoluble polymers
(Elsevier Ltd, 2019)Aqueous systems composed of low molecular-weight species (LMWS) and water-soluble polymers (WSP) present important technological applications. Therefore, continuous advances on characterization techniques are crucial to ... -
Optimization of the Extraction of Antioxidant Compounds from Roselle Hibiscus Calyxes (Hibiscus sabdariffa), as a Source of Nutraceutical Beverages
(MDPI, 2023-03-14)Secondary metabolites from Hibiscus sabdariffa have been used to prevent different diseases. Roselle Hibiscus is known for being rich in phenolic bioactive compounds. The extraction conditions are directly related to the ...