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Search Results: 1 - 10 of 695389 matches for " Ricardo J. Morales De Jesús "
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Internet Resources and References
Ricardo J Morales De Jesús
Revista Umbral , 2009,
Abstract: Las siguientes referencias y portales de Internet se compilaron para proveer una mirada contemporánea a las Ciencias de la Tierra y como éstas funcionan.
Gaia, naturaleza de la ciencia y Sistemodinámica
Fernando J Noriega Castillo,Ricardo Morales de Jesús
Revista Umbral , 2009,
Abstract: Este artículo surgió del Seminario Pre-Conferencia Internacional “Gaia y Cambio Climático” expuesto por los autores el 28 de febrero de 2007 en la Facultad de Estudios Generales. En el artículo damos a conocer el concepto de Gaia a la luz de su origen y desarrollo histórico, la forma como se inserta en el proceso de creación de conocimiento científico, así como las razones y maneras como se relaciona con la Sistemodinámica. Dicha inserción, la analizamos desde perspectivas epistemológicas de mayor impacto durante el siglo pasado, entre ellas las de Karl Popper, Thomas Kuhn, Imre Lakatos y Mario Bunge. Además de las perspectivas epistemológicas, tomamos en cuenta aportaciones sociológicas e históricas que permitieran responder preguntas tales como: Qué papel jugó la tecnología y la personalidad de su creador en la propuesta de Gaia y su posterior desarrollo? Es viable la concepción de la Tierra como un organismo vivo. Palabras clave: Gaia, Sistemodinámica, revolución científica, programa de investigación, modelaje sistemodinámico, ciclos químicos, desarrollo científico
Proyecto de Integración de Competencias de Información al Currículo de la Facultad de Estudios Generales de la Universidad de Puerto Rico, Recinto de Río Piedras, inicio de una relación inter-facultativa, creación de una comunidad
Aurea E. Maisonet-Rodríguez,Ricardo J. Morales De Jesús
Simbiosis : Revista Electrónica de Ciencias de la Información , 2012,
Abstract: En el siguiente artículo se presentan los resultados del primer ciclo del Proyecto de Integración de Competencias de Información al Currículo de la Facultad de Estudios Generales, del Recinto de Río Piedras de la Universidad de Puerto Rico. El desarrollo de este proyecto responde a los principios institucionales que van dirigidos a que a lo largo de su experiencia académica, los estudiantes, desarrollen las destrezas necesarias para la búsqueda, manejo y uso de la información en forma ética y efectiva. Sentando las bases necesarias para que éste sea un aprendiz de por vida. Este proyecto tiene como base los estándares de ACRL para la educación superior. Los objetivos del proyecto están basados en los estándares relacionados a identificar la necesidad de información, dise o de estrategias, búsqueda de información, reconocer la diversidad de formatos y aspectos éticos y legales. A largo plazo está dirigido a que cada estudiante a través de su experiencia académica en los cursos de la facultad, se enfrente a diversas actividades de integración de competencias de información desarrolladas por sus profesores con la colaboración del bibliotecario(a). En la facultad de Estudios Generales, estas actividades se desarrollarán a nivel de inicio. La colaboración entre el profesor y el bibliotecario(a) han sido claves para el desarrollo inicial del proyecto que durante el primer semestre 2010-2011 tuvo su primera fase de implementación en varios cursos de la facultad. En términos generales, la misma obtuvo resultados positivos. Uno de estos ejercicios de integración se detalla en este artículo.
Control of an Automotive Semi-Active Suspension
Jorge de Jesús Lozoya-Santos,Ruben Morales-Menendez,Ricardo A. Ramírez Mendoza
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/218106
Abstract: Two controllers for an automotive suspensions with Magneto-Rheological (MR) dampers are proposed. One is a model-based using the Linear Parameter Varying (LPV) approach, and the other is a model-free controller with a Frequency Estimation Based (FEB) principle. The LPV controller includes an experimental nonlinear model of an MR damper using only one scheduling parameter. A comparison with a several semiactive controllers for comfort and road holding is discussed. The FEB controller is the best option based on frequency and time response analysis for comfort (10–20%), suspension deflection (30–50%), and road holding (1–5%).
Patient preferences and treatment safety for uncomplicated vulvovaginal candidiasis in primary health care
Isabel Del-Cura González, Francisca García-de-Blas González, Teresa Cuesta, Jesús Fernández, Justo M Del-Alamo Rodríguez, Rosa A Escriva Ferrairo, M del Canto De-Hoyos Alonso, Laura Arenas, Ricardo Barrientos, Elisa Wiesmann, Cristina De-Alba Romero, Yolanda Díaz, Ana Rodríguez-Mo?ino, Blanca Teira, Marta del Pozo, Jesús Horcajuelo, María J Rojas Giraldo, Paulino González, Rocío A Vello Cuadrado, Beatriz Uriarte, Jeannet Yepes, Yolanda Sanz, M Iglesias Pi?eiro, Susana Hernández, Fernando Alonso, Ana I González González, Alicia Fernández, Carmen Carballo, Ana López, Fernanda Morales
BMC Public Health , 2011, DOI: 10.1186/1471-2458-11-63
Abstract: This work describes a protocol of a multicentric prospective observational study with one year follow up, to describe the women's reasons and preferences to choose the way of administration (oral vs topical) in the treatment of not complicated candidal vaginitis. The number of women required is 765, they are chosen by consecutive sampling. All of whom are aged 16 and over with vaginal discharge and/or vaginal pruritus, diagnosed with not complicated vulvovaginitis in Primary Care in Madrid.The main outcome variable is the preferences of the patients in treatment choice; secondary outcome variables are time to symptoms relief and adverse reactions and the frequency of recurrent vulvovaginitis and the risk factors. In the statistical analysis, for the main objective will be descriptive for each of the variables, bivariant analysis and multivariate analysis (logistic regression).. The dependent variable being the type of treatment chosen (oral or topical) and the independent, the variables that after bivariant analysis, have been associated to the treatment preference.Clinical decisions, recommendations, and practice guidelines must not only attend to the best available evidence, but also to the values and preferences of the informed patient.Vaginitis is the most frequent reason for gynecology consultation in primary health care services. It is estimated that 75% of women experience at least one episode of vulvovaginal candidiasis throughout her life and 40-50% of them have at least one recurrence [1].The most frequent cause of vulvovaginal inflammation is infective, beeing the main organisms: Gardnerella vaginalis (15-50%), Candida (C) (20-25%) and Trichomonas vaginalis (5-50%) species, with a frequency distribution that depends on the populations studied [2]. Candidal vaginitis is a generic term used for vaginal infections caused by Candida species. Candida albicans is responsible for 90% of vulvovaginal candidiasis; the remaining 10% corresponds to C. glabrata and C
Muerte súbita asociada a descarga eléctrica en un equino: reporte de un caso
Morales B,Abelardo; García,Francisco; L,Júlio De Jesús; Villoria L,Diana;
CES Medicina Veterinaria y Zootecnia , 2012,
Abstract: the aim of this study was to describe a case of sudden death in a horse associated with electric shock. refer a thoroughbred horse race, sex male, 7 years old. with a history of sudden collapse and death. he practiced the technique described for equine necropsy. samples were collected from all organs for histology. additionally, blood samples for complete blood count and blood chemistry. the room where the fish was was assessed with a power detector. necropsy results were cyanotic mucous membranes, marked rigor mortis. bleeding ecchymotic epicardium and endocardium. liver hemorrhage, adrenal and kidney bruise. the histological sections showed in muscle: marked hypereosinophilia, retains the basic profile of the muscle myofibril, acute coagulation necrosis. heart: coagulation necrosis, degeneration of muscle myofibrils with hyalinization and swelling. hematological tests evidenced acute hemolysis. environmental assessment with the power detector revealed a discharge of electricity with an amperage ≥250 ma. in conclusion we report a case of sudden death in a horse associated with electric shock.
Reduced Stability and Increased Dynamics in the Human Proliferating Cell Nuclear Antigen (PCNA) Relative to the Yeast Homolog
Alfredo De Biasio,Ricardo Sánchez,Jesús Prieto,Maider Villate,Ramón Campos-Olivas,Francisco J. Blanco
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016600
Abstract: Proliferating Cell Nuclear Antigen (PCNA) is an essential factor for DNA replication and repair. PCNA forms a toroidal, ring shaped structure of 90 kDa by the symmetric association of three identical monomers. The ring encircles the DNA and acts as a platform where polymerases and other proteins dock to carry out different DNA metabolic processes. The amino acid sequence of human PCNA is 35% identical to the yeast homolog, and the two proteins have the same 3D crystal structure. In this report, we give evidence that the budding yeast (sc) and human (h) PCNAs have highly similar structures in solution but differ substantially in their stability and dynamics. hPCNA is less resistant to chemical and thermal denaturation and displays lower cooperativity of unfolding as compared to scPCNA. Solvent exchange rates measurements show that the slowest exchanging backbone amides are at the β-sheet, in the structure core, and not at the helices, which line the central channel. However, all the backbone amides of hPCNA exchange fast, becoming undetectable within hours, while the signals from the core amides of scPCNA persist for longer times. The high dynamics of the α-helices, which face the DNA in the PCNA-loaded form, is likely to have functional implications for the sliding of the PCNA ring on the DNA since a large hole with a flexible wall facilitates the establishment of protein-DNA interactions that are transient and easily broken. The increased dynamics of hPCNA relative to scPCNA may allow it to acquire multiple induced conformations upon binding to its substrates enlarging its binding diversity.
Adaptive Behaviour and Paddle Tennis: A Case Study of Down’s Syndrome  [PDF]
Ricardo De la Vega, Roberto Ruíz, Maria De la Rocha, Jesús Onrubia, Oswaldo Rivera
Advances in Physical Education (APE) , 2013, DOI: 10.4236/ape.2013.34030
Abstract: Adaptive behaviour is one of the key elements to diagnose intellectual disability. In addition, these behaviors are crucial in order to operate on the daily life. As a population with a high risk of developing a sedentary lifestyle, adapted physical activity programs for people and children with intellectual disability are needed. Therefore the aim of this study is to assess the influence of adapted paddle tennis intervention program on the adaptive behaviour of a child with Down’s syndrome. In a case study of child with Down’s syndrome (male, Caucasian, age = 4.5 years), he participated on a paddle tennis program with a length of 12 weeks. The child’s parents assessed the adaptive behaviour before and after the program through the Adapted Behaviour Scale (ABS-S:2). Obtained data showed that three domains presented a positive increasing. Parents reported that physical development increased from 19 to 23.5, and this increase was corroborated by the instructor (post score = 23.8). Moreover, language development increases from 18.5 to 28 (parents). The paddle tennis instructor perceived an increase in speaking abilities after the program. The self-management domain also showed an increase from 8 to 17. The adapted paddle tennis program is suitable for promoting physical activity and for improving adaptive behaviour in children with intellectual disabilities.
Contaminación por coliformes y helmintos en los ríos Texcoco, Chapingo y San Bernardino tributarios de la parte oriental de la Cuenca del Valle de México
RIVERA-VáZQUEZ, Ricardo;PALACIOS-VéLEZ, óscar L;CHáVEZ MORALES, Jesús;BELMONT, Marco A;NIKOLSKI-GAVRILOV, Iourii;DE LA ISLA DE BAUER, Ma. de Lourdes;GUZMáN-QUINTERO, Arturo;TERRAZAS-ONOFRE, Liliana;CARRILLO-GONZALEZ, Rogelio;
Revista internacional de contaminación ambiental , 2007,
Abstract: the texcoco zone, located at the east of the mexican basin, presents serious contamination of its rivers caused by discharges of raw wastewater. until this research, there were not available records about the contamination sources and the pollutants discharge. the aim of this research was to identify the effluent discharges to the river and their degree of pollution. from may 2004 to april 2005, water samples were collected ten times from 28 wastewater discharges to the rivers. chemical (methylene blue active substances, trace elements, n, p and ec) and biological (total coliform bacteria content (tbc), fecal bacteria coliform (fbc) and helminth ova) contaminant contents were analyzed, according to the mexican regulation. the tbc (as the most probable number mpn) ranged from 1.6 x 104 mpn 100 ml-1 to 2.4 x 107 mpn 100 ml-1, the fbc ranged from 1 x 104 to 2.4 x 107 and helminth ova ranged from 0.38 to 6.78 eggs l-1. these amounts exceeded the permissible limits established by the mexican guideline nom-001-semarnat (1000 nmp of fbc per 100 ml and 5 helminth ova as monthly average in water used for not restricted irrigation). a fraction of the wastewater discharge into streams and rivers is used for irrigation of agricultural lands, while other is lixiviated to subsoil and could eventually polluted groundwater. the waste water treatment before its discharge to the rivers is recommended.
Magnetic capsules for NMR imaging: Effect of magnetic nanoparticles spatial distribution and aggregation
Azhar Zahoor Abbasi,Lucía Gutiérrez,Loretta L. del Mercato,Fernando Herranz,Oksana Chubykalo-Fesenko,Sabino Veintemillas-Verdaguer,Wolfgang J. Parak,M Puerto Morales,Jesús M González,Antonio Hernandoe,Patricia de la Presa
Physics , 2011, DOI: 10.1021/jp1118234
Abstract: Magnetic and NMR relaxivity properties of {\gamma}-Fe2O3 nanoparticles embedded into the walls of polyelectrolyte multilayer capsules and freely dispersed in a sodium borate buffer solution have been investigated. The different geometric distribution of both configurations provides the opportunity to study the relationship of water accessibility and magnetic properties of particles on the NMR relaxivity. Changes in their blocking temperature and average dipolar field were modeled as a function of packing fraction in the ensemble of free and entrapped nanoparticles. For free nanoparticles with relatively low concentration, relaxivity values increase with packing fraction according to an increase in the dipolar field and larger water accessibility. However for embedded NPs in the capsule wall, packing fractions should be limited to optimise the efficiency of this system as magnetic resonance imaging (MRI) contrast agent.
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