Sintesis
Mostrando 1-12 de 47 artigos, teses e dissertações.
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1. Medical treatment in pregnant women with subclinical hypothyroidism: systematic review and meta-analysis
Resumo Objetivos: determinar la efectividad de la terapia médica para disminuir las complicaciones asociadas al hipotiroidismo subclínico durante la gestación. Métodos: en el 2021 se realizó una revisión sistemática de estudios de cohortes disponibles en tres bases de datos, sin límite de fecha de publicación. La selección de estudios y extracci�
Revista Brasileira de Saúde Materno Infantil. Publicado em: 2022
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2. Síntesis y caracterización de un novedoso biomaterial a base de quitosano modificado con aminoácidos
ABSTRACT The chemical modification of chitosan (CH) from shrimp shells (Litopenaeus vannamei) was performed with amino acids: L-leucine (Leu) and L-tyrosine (Tyr), in order to change some of its physical and chemical properties, which allow the enhancement of the applications of chitosan in biomedical and pharmacological areas. The characterization of chitos
Matéria (Rio J.). Publicado em: 16/09/2019
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3. Obtención de nanopartículas de LiCoO2 mediante síntesis por combustión de soluciones
ABSTRACT Lithium Cobalt Oxide (LiCoO2) nanoparticles were obtained by the Solutions Combustion Synthesis method, using starch as fuel. Four starch/nitrates ratios (φe) (ranging 0.5-1.25) have been studied. One route was a conventional, stoichiometric process, while the other ones were a nonstoichiometric process. The samples were calcined in air at 773K. Th
Matéria (Rio J.). Publicado em: 19/07/2018
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4. Síntesis y evaluación de las propiedades magnéticas de ferritas de galio y manganeso
ABSTRACT In this work, the synthesis of MgxGa1-xFe2O4 magnetic nanoparticles (MNPs) by sol-gel method is presented. All synthesized samples were identified as a crystalline single phase and the saturation magnetization (Ms) values are within the range of 21,2 to 46,4 emu/g, while coercive field values are less than 100 Oe. The selected samples (x= 0,4 and 0,
Matéria (Rio J.). Publicado em: 19/07/2018
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5. Síntesis y propiedades de electrodos de níquel/grafeno para generación de hidrógeno
ABSTRACT The use of nanomaterials, such graphene oxide (GO), as blocks for the synthesis of hybrid materials has been extensively studied in recent years. In this paper a simple and reproducible method for the synthesis of hybrid nickel/graphene electrodes is presented. This method involves the modification of a conventional electroplating nickel bath by inc
Matéria (Rio J.). Publicado em: 19/07/2018
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6. Síntesis de sílice mesoestructurada: determinación de las condiciones óptimas de extracción del templato
ABSTRACT Ordered mesoporous silica was synthesized by the sol-gel process using tetraethoxysilane (TEOS) as silica source and hexadecyltrimethyl ammonium bromide (CTAB) as structure directing agent. Post-synthesis surfactant removal was conducted by two techniques: calcination, with progressive increases in temperature up to 550 ºC and solvent extraction us
Matéria (Rio J.). Publicado em: 19/07/2018
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7. Síntesis y caracterización de fotocatalizadores de hierro soportado sobre zeolitas microporosas
ABSTRACT ZSM11 and BETA zeolitic materials were synthesized by the hydrothermal method and were further impregnated with a 6 wt% of iron and characterized by different physicochemical techniques in order to be employed in the photocatalytic degradation of methyl orange (MO). Matrices structures and crystallinity were verified by X Ray Diffraction (XRD) and F
Matéria (Rio J.). Publicado em: 19/07/2018
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8. Síntesis y caracterización de “tanatos” de lantano como inhibidores de la corrosión
ABSTRACT Tannins are polyphenols synthesized by plants. They are found in Quebracho (Schinopsis Balansae) wood, Tara (Caesalpinia spinosa) fruits, etc. They have been incorporated in the coating industry as "antifouling" agents and as corrosion inhibitors in acidic solutions. Moreover, lanthanum solutions have a great inhibitory effect over SAE 1010 steel co
Matéria (Rio J.). Publicado em: 19/07/2018
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9. Síntesis y estudio de propiedades estructurales y magnéticas de ferritas Mg1-xZnxFe2O4 (x= 0-0,9)
ABSTRACT Nowadays, iron oxide based magnetic nanoparticles are used in several science and technology applications due to their magnetic properties. Likewise, these materials are used in biomedical applications such as contrast agents for magnetic resonance imaging, magnetic hyperthermia, targeted drug delivery, etc. In this work, the synthesis and character
Matéria (Rio J.). Publicado em: 19/07/2018
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10. La política de la protesta en regímenes autoritarios: síntesis crítica
RESUMEN Introducción A través de una revisión crítica de la literatura reciente, el ensayo explora la relación entre protesta contenciosa y regímenes autoritarios, y examina las dinámicas y consecuencias que emergen durante el conflicto político. Métodos Para lo anterior se discuten tres elementos que los especialistas han identificado como los pr
Rev. Sociol. Polit.. Publicado em: 2018-03
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11. Síntesis verde y caracterización de sólidos de matriz silícea con cobre y plata obtenidos a partir de dos precursores para su aplicación como aditivos antifúngicos
Matéria (Rio J.). Publicado em: 2015-09
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12. Síntesis y propiedades de filmes basados en quitosano/lactosuero
Chitosan is a natural polymer derived from deacetylation of chitin, which exhibits properties such as biocompatibility, biodegradability and may form films, being applied in the food industry and medicine. Degradable chitosan films were prepared from chitosan extracted from shrimp shells and whey, using different concentrations of chitosan solution (1, 1.5,
Polímeros. Publicado em: 2015-02