1,721,226 research outputs found
Extracción de lignanos de carbón leonarditico por los metodos sosa- cloruro de sodio y run-cang sun y determinación de su actividad antioxidante
No full textEste trabajo busca extraer de dicha matriz ácidos húmicos por el método de Run Cang Sun, y el método de sosa – cloruro de sodio, una vez extraídos, fragmentarlos y solubilizarlos para determinar su poder antioxidante. Ya que es conocido que una vez fragmentado los ácidos húmicos se obtienen lignanos y estos poseen grandes cualidades que prestan beneficio a la salud humana. En el presente estudio se hace una breve descripción del estado del arte, sobre los ácidos húmicos, la descripción de las características del carbón objeto de estudio; finalizando con una descripción de la metodología empleada para el desarrollo del estudio, los resultados obtenidos y las conclusiones a las que se llegó
DETOXIFICATION AND SEPARATION OF LIGNOCELLULOSIC BIOMASS PRIOR TO FERMENTATION FOR BIOETHANOL PRODUCTION BY REMOVAL OF LIGNIN AND HEMICELLULOSES
No full textLignocellulosic materials such as agricultural residues have been recog-nized as potential sustainable sources of mixed sugars for fermentation to bioethanol. To obtain a high overall ethanol yield and achieve an economically feasible production process, the removal of lignin and hemicelluloses improves the accessibility of cellulosic material to hydro-lytic enzymes and avoids the degradation products that are inhibitory to the yeast used in the subsequent fermentation. Technological advances, e.g., environmentally friendly removal of lignin and hemicelluloses from lignocellulosic biomass prior to fermentation of the librated glucose from cellulose into bioethanol, has the potential to provide for sustainable and cost effective production of biofuel
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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