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Search Results: 1 - 10 of 325177 matches for " Mireia Farrús "
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Acylation of Chiral Alcohols: A Simple Procedure for Chiral GC Analysis
Mireia Oromí-Farrús,Mercè Torres,Ramon Canela
Journal of Analytical Methods in Chemistry , 2012, DOI: 10.1155/2012/452949
Abstract: The use of iodine as a catalyst and either acetic or trifluoroacetic acid as a derivatizing reagent for determining the enantiomeric composition of acyclic and cyclic aliphatic chiral alcohols was investigated. Optimal conditions were selected according to the molar ratio of alcohol to acid, the reaction time, and the reaction temperature. Afterwards, chiral stability of chiral carbons was studied. Although no isomerization was observed when acetic acid was used, partial isomerization was detected with the trifluoroacetic acid. A series of chiral alcohols of a widely varying structural type were then derivatized with acetic acid using the optimal conditions. The resolution of the enantiomeric esters and the free chiral alcohols was measured using a capillary gas chromatograph equipped with a CP Chirasil-DEX CB column. The best resolutions were obtained with 2-pentyl acetates (=3.00) and 2-hexyl acetates (=1.95). This method provides a very simple and efficient experimental workup procedure for analyzing chiral alcohols by chiral-phase GC.
Automatic Evaluation for E-Learning Using Latent Semantic Analysis: A Use Case
Mireia Farrús,Marta R. Costa-jussà
International Review of Research in Open and Distance Learning , 2013,
Abstract: Assessment in education allows for obtaining, organizing, and presenting information about how much and how well the student is learning. The current paper aims at analysing and discussing some of the most state-of-the-art assessment systems in education. Later, this work presents a specific use case developed for the Universitat Oberta de Catalunya, which is an online university. An automatic evaluation tool is proposed that allows the student to evaluate himself anytime and receive instant feedback. This tool is a web-based platform, and it has been designed for engineering subjects (i.e., with math symbols and formulas) in Catalan and Spanish. Particularly, the technique used for automatic assessment is latent semantic analysis. Although the experimental framework from the use case is quite challenging, results are promising.
Preparation of (S)-1-Halo-2-octanols Using Ionic Liquids and Biocatalysts
Mireia Oromí-Farrús,Jordi Eras,Núria Sala,Mercè Torres,Ramon Canela
Molecules , 2009, DOI: 10.3390/molecules14104275
Abstract: Preparation of (S)-1-chloro-2-octanol and (S)-1-bromo-2-octanol was carried out by the enzymatic hydrolysis of halohydrin palmitates using biocatalysts. Halohydrin palmitates were prepared by various methods from palmitic acid and 1,2-octanediol. A tandem hydrolysis was carried out using lipases from Candida antarctica (Novozym? 435), Rhizomucor miehei (Lipozyme IM), and “resting cells” from a Rhizopus oryzae strain that was not mycotoxigenic. The influence of the enzyme and the reaction medium on the selective hydrolysis of isomeric mixtures of halohydrin esters is described. Novozym? 435 allowed preparation of (S)-1-chloro-2-octanol and (S)-1-bromo-2-octanol after 1–3 h of reaction at 40 °C in [BMIM][PF6].
Anàlisi comunicativa i pragmàtica dels registres d’infermeria
Mireia Tarruella i Farré
Anuari de Filologia : Estudis de Lingüística , 2013,
Abstract: Aquest treball presenta una anàlisi de les pràctiques discursives que els professionals d’infermeria empren en la documentació clínica. La recerca aplica conceptes de pragmàtica en aspectes de la dixi i d’enunciats de caire referencial, entre altres elements discursius. L’elaboració del corpus documental ACOPRI, nom que deriva de l’acrònim de Anàlisi COmunicativa i Pragmàtica de Registres d’Infermeria ha estat el pas previ indispensable per poder dur a terme l’anàlisi. El corpus ACOPRI consta de 1320 enunciats procedents de fulls d’observacions d’infermeria recopilats a nou centres sanitaris. En aquesta memòria es recullen finalment propostes pel que fa als usos expressius, pel que fa a la llegibilitat, a l’eficàcia informativa i a la seguretat jurídica.
Revealing the molecular relationship between type 2 diabetes and the metabolic changes induced by a very-low-carbohydrate low-fat ketogenic diet
Judith Farrés, Albert Pujol, Mireia Coma, Jose Ruiz, Jordi Naval, José Mas, Agustí Molins, Joan Fondevila, Patrick Aloy
Nutrition & Metabolism , 2010, DOI: 10.1186/1743-7075-7-88
Abstract: Our systemic approach is based on the creation and analyses of the cell networks representing the metabolic state in a very-low-carbohydrate low-fat ketogenic diet. This global view might help identify unnoticed relationships often overlooked in molecule or process-centered studies.A strong relationship between the insulin resistance pathway and the ketosis main pathway was identified, providing a possible explanation for the improvement observed in clinical trials. Moreover, the map analyses permit the formulation of some hypothesis on functional relationships between the molecules involved in type 2 diabetes and induced ketosis, suggesting, for instance, a direct implication of glucose transporters or inflammatory processes. The molecular network analysis performed in the ketogenic-diet map, from the diabetes perspective, has provided insights on the potential mechanism of action, but also has opened new possibilities to study the applications of the ketogenic diet in other situations such as CNS or other metabolic dysfunctions.Efforts to link metabolic status or diseases by using simple, schematic biological pathways seldom offer the possibility to view the "broad picture", and are rarely able to explain the richness of the complex, redundant, intricate and sometimes blurry nature of human metabolism. Recently, the concept of "Diseaseome" [1] has arisen, as an essay to conceptualize at the highest level the relationship between observed phenotypes and underlying molecular and physiological disease mechanisms or disease cures. Although they are often treated separately, most human diseases are not independent of each other. Many diseases are associated with the breakdown of functional modules (subnetworks) of a complex network connecting many cellular components. Therefore, an understanding of the functionally relevant genetic, regulatory, metabolic and protein-protein interactions will play an important role in understanding the pathophysiology of human diseases
Projecte d'edició crítica de l'obra completa de Verdaguer
Pere Farrés
Llengua & Literatura , 1998, DOI: 10.2436/l&l.vi.1318
Abstract:
Fritz Vogelgsang: Salvador Esprius übersetzer ins Deutsche [Fritz Vogelgsang: The translator of Salvador Espriu into German]
Farrés, Ramon
Zeitschrift für Katalanistik , 2010,
Abstract: Salvador Espriu’s bilingual (Catalan-German) publication of his complete poetical works by the Zurich publishing house Amman marks a historic moment in the reception of Catalan literature in German-speaking countries. It also represents the apex of the penetration of Espriu in the German literary system, a process which began in 1970. This article looks at this process in detail, focusing on Fritz Vogelgsang, author of the German version of the complete poetical works. A study of the texts is carried out, departing from the translator’s own comments, a comparison with other versions, and the appraisal found in German reviews.
Las amenazas globales del siglo XXI
Avilés Farré, Juan
Arbor : Ciencia, Pensamiento y Cultura , 2005,
Abstract: El mundo de comienzos del siglo XXI se caracteriza por el desarrollo de nuevas amenazas de carácter transnacional, a menudo protagonizadas por agentes no estatales, que ponen en cuestión los límites tradicionales entre la seguridad exterior y la seguridad interior, al tiempo que crece la conciencia de la estrecha interrelación entre los problemas económicos, sociales y medioambientales y los problemas de seguridad. Las principales amenazas pueden agruparse en cinco áreas: pobreza, enfermedades infecciosas y deterioro medioambiental; conflictos armados; proliferación de armas nucleares, biológicas, químicas y radiológicas; terrorismo; y delincuencia organizada transnacional.…
La investigación en Pediatría Extrahospitalaria y de Atención Primaria: los estudios multicéntricos Research in Ambulatory Pediatrics and Primary Care: the multicentric studies
F. Prandi Farrás
Boletín de Pediatría , 2010,
Abstract: Basar una apreciación científica en las impresiones personales, en la propia experiencia, es correr el riesgo de ser sólo aproximativo o francamente inexacto. No hay que fiarse de las impresiones propias. Las conclusiones extraídas de una investigación basada en una experiencia provocada tienen un alcance mucho más profundo y son más difícilmente rebatibles que las que resultan de una experiencia elemental vivida. En primer lugar una experiencia provocada requiere una amplia meditación sobre sus objetivos y éstos se han de definir con gran precisión. En segundo término exige una planificación de las ideas y de las actuaciones, y finalmente presupone la exigencia de una dirección. La experiencia provocada es la base de la investigación en medicina.
Fractal design for efficient brittle plates under gentle pressure loading
R. S. Farr
Physics , 2009, DOI: 10.1103/PhysRevE.76.046601
Abstract: We consider a plate made from an isotropic but brittle elastic material, which is used to span a rigid aperture, across which a small pressure difference is applied. The problem we address is to find the structure which uses the least amount of material without breaking. Under a simple set of physical approximations and for a certain region of the pressure-brittleness parameter space, we find that a fractal structure in which the plate consists of thicker spars supporting thinner spars in an hierarchical arrangement gives a design of high mechanical efficiency.
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