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Search Results: 1 - 10 of 7553 matches for " Nabila Osiris áLVAREZ FRAGOSO "
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DETERMINACIóN DE METALES PESADOS EN RESIDUOS SóLIDOS Y LIXIVIADOS EN BIORREACTORES A DIFERENTES TASAS DE RECIRCULACIóN
María del Consuelo HERNáNDEZ BERRIEL,Nabila Osiris áLVAREZ FRAGOSO,Rocio VACA,Liliana MáRQUEZ BENAVIDES
Revista internacional de contaminación ambiental , 2012,
Abstract: Los metales pesados (MP) son parte de los contaminantes que contiene el lixiviado, este es generado por la descomposición de los residuos sólidos urbanos (RSU), el cual por su toxicidad puede causar severos problemas al ambiente. El propósito de este trabajo fue conocer el efecto de diferentes tasas de recirculación de lixiviados en la concentración de MP, así como en la matriz de residuos de biorreactores anaerobios (BrA) a escala laboratorio, para determinar la tasa que produzca la menor lixiviación de MP. Se utilizaron 20 BrA con RSU del relleno sanitario de Pátzcuaro, Michoacán, México; cuatro como testigos y al resto se les recircularon sus lixiviados dos veces por semana, para mantener los contenidos de humedad de 50, 60, 70 y 80 % base húmeda (%Hbh) por cuadruplicado. Se dio seguimiento durante 126 días a los lixiviados producidos, a los cuales se les determinó pH y metales pesados totales (MPT). A los residuos sólidos descargados se les determinó pH, materia orgánica (MO), MPT y metales pesados disponibles (MPD), Ni, Pb y Zn. Los lixiviados generados a 80 y 70 % Hbh, presentaron menor lixiviación de MP, mientras que a 50 % Hbh durante las fases de hidrólisis y acidogénesis mostraron concentraciones elevadas. Para MPT en los residuos sólidos, Ni y Pb presentaron diferencias significativas entre las muestras y en cuanto a los MPD sólo existieron diferencias significativas para Zn. Los residuos sólidos de todas las tasas de recirculación pueden utilizarse como mejoradores de suelo por su alto contenido de MO y baja concentración de MP.
The Modalities of Students’ Engagement in Tunisian Private School  [PDF]
Nabila Bennour
Advances in Physical Education (APE) , 2015, DOI: 10.4236/ape.2015.52017
Abstract: In this article, we describe a particular aspect of the teaching-learning process: students’ cooperation. Our research attempts to understand the modalities of student engagement at a private institution in Tunisia. We mobilize the theoretical framework of the ecology of physical education (Tousignant, 1982) as a framework for this research. The data results from video recording and ethnographic observations of a gymnastics cycle conducted by a teacher specialist of tennis. The study was conducted according to a macroscopic analysis of students’ behavior of cooperation during three sessions of school education of gymnastics. Through the comparison of forms of engagement for contrasted students (high vs. low), the results reveal recurring characteristics and differences in degrees of cooperation between students according to their school levels.
Teaching Practices and Student Action in Physical Education Classes: Perspectives for Teacher Education  [PDF]
Nabila Bennour
Creative Education (CE) , 2015, DOI: 10.4236/ce.2015.610095
Abstract: This research is part of an educational framework for analyzing teaching practices. It attempts to understand teachers’ practices in physical education. For this matter, it relies on the theoretical framework of didactic joint action. Using “ordinary didactics” Schubauer-Leoni & Leutenegger, (2002), as a method of observation, we describe the teaching practices of two non-specialized teachers during two gymnastics units in two senior classes. The subject of our research is to joint didactic action in two didactic school systems: the first one is public while the second is private. In other terms, this research attempts the analysis of what the preselected teachers and students say and do while interacting. It attempts to identify teaching conditions that enable students to teach themselves, i.e. practice autonomous learning. The results put in evidence some generic characteristics of the topo-genetic process that may favor task transformation behavior among students in the context of each school system. The results open new perspectives of physical education for teacher education.
Demencia con cuerpos de Lewy: Presentación de 1 caso
Cubero Rego,David; Cubero Menéndez,Osiris; Cabrera Mehn,Mylene; álvarez Santana,Reinaldo;
Revista Cubana de Medicina , 2004,
Abstract: it has been stated that dementia is the fourth basic cause of death in first world countries. dementia with lewy bodies (dlb) is the second cause of dementia in current necropsic studies, only surpassed by alzheimer's disease. the first cuban case of dementia with lewy bodies was reported. a female white patient aged 89 with clinical diagnosis of dementia that died after 5 years of progressive deterioration. in the neuropathological study, the presence of lewy bodies at the level of the black matter, locus ceruleus and transentorhinal cortex was evidenced by using the haematoxylin/eosin technique. the neurofibrillar pathology assessed by bielschowsky technique corresponded to ii stage braak. a focal espongiform change was identified at the hippocampal level. the diagnosis of lbd variety with predominance of the brain stem was made. literature and the main differential diagnoses were reviewed.
Demencia con cuerpos de Lewy: Presentación de 1 caso Dementia with lewy bodies: A case report
David Cubero Rego,Osiris Cubero Menéndez,Mylene Cabrera Mehn,Reinaldo álvarez Santana
Revista Cubana de Medicina , 2004,
Abstract: Se ha planteado que la demencia constituye la cuarta causa básica de muerte en países del primer mundo. La demencia con cuerpos de Lewy (DCL) constituye la segunda causa de demencia en estudios necrópsicos actuales, superada solo por la enfermedad de Alzheimer. Se reportó el primer caso cubano de demencia con cuerpos de Lewy, una paciente femenina de 89 a os de edad, de la raza blanca, con diagnóstico clínico de demencia, que falleció luego de 5 a os de deterioro progresivo. En el estudio neuropatológico se evidenció con la técnica de hematoxilina / eosina la presencia de cuerpos de Lewy al nivel de la sustancia negra, locus cerúleo y corteza transentorrinal, la patología neurofibrilar valorada con la técnica de Bielschowsky se correspondió con un estadio II de Braak. Se identificó además cambio espongiforme focal al nivel del hipocampo. Se hizo el diagnóstico de DCL variedad a predominio del tallo cerebral. Se revisó la literatura y los principales diagnósticos diferenciales. It has been stated that dementia is the fourth basic cause of death in first world countries. Dementia with Lewy bodies (DLB) is the second cause of dementia in current necropsic studies, only surpassed by Alzheimer's disease. The first Cuban case of dementia with Lewy bodies was reported. A female white patient aged 89 with clinical diagnosis of dementia that died after 5 years of progressive deterioration. In the neuropathological study, the presence of Lewy bodies at the level of the black matter, locus ceruleus and transentorhinal cortex was evidenced by using the haematoxylin/eosin technique. The neurofibrillar pathology assessed by Bielschowsky technique corresponded to II stage Braak. A focal espongiform change was identified at the hippocampal level. The diagnosis of LBD variety with predominance of the brain stem was made. Literature and the main differential diagnoses were reviewed.
The Relationship between Antioxidant and Anti-Ulcer Activities in Saudi Honey Samples Harvested from Various Regions in Different Seasons  [PDF]
Nabila Al-Jaber
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.48A016
Abstract: The main chemical components of 13 Saudi honey samples (composed of winter and summer honeys) were identified according to anti-ulcer and antioxidant activity by using phytochemical and chromatographic analyses. Phytochemical screening of ethyl acetate and water extracts was used to detect the presence of carbohydrates, flavonoids, amino acids, and phenolic acids. High-performance liquid chromatography (HPLC) of sugar contents was used to detect the presence of galactose in all of the honey samples. The other detected sugars were sucrose, fructose, and arabinose. Fifteen amino acids were detected in all of the honey samples: Prolin is dominant in all of the honey samples. The citric acid and tartaric acids of winter and summer honey were also detected, in addition to faint traces of free oxalic acid. Both samples were tested for amino acids, phenolic compounds, and sugars. The most crucial result derived in this study is the effect of summer honey on ulcers. The anti-ulcer activities were also evaluated, showing that oral administration of the honey samples reduced the intensity of ulcer scores when compared to the control group. Similarly, there was a highly significant reduction in the values of the ulcer indices and areas in rats that received the same sample (P < 0.05 and P < 0.01) in comparison with those of the ulcer control rats. Finally, the antioxidant activity of the honey samples was evaluated, revealing a proportional relationship between the anti-oxidant and anti-ulcer activities. The results of this study could be reached that the effectiveness of honey as an anti-ulcer increase with the increasing its antioxidant activities.
Thermal and structural studies of poly (vinyl alcohol) and hydroxypropyl cellulose blends  [PDF]
Osiris W. Guirguis, Manal T. H. Moselhey
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.41009
Abstract: Polymers and polymeric composites have steadily reflected their importance in our daily life. Blending poly(vinyl alcohol) (PVA) with a potentially useful natural biopolymers such as hydroxypropyl cellulose (HPC) seems to be an interesting way of preparing a polymeric blends. In the present work, blends of PVA/HPC of compositions (100/0, 90/10, 75/25, 50/50, 25/75, and 0/100 wt/wt%) were prepared to be used as bioequivalent materials. Thermal analyses [differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)], and X-ray diffraction (XRD) were employed to characterize and reveal the miscibility map and the structural properties of such blend system. The obtained results of the thermal analyses showed variations in the glass transition temperature (Tg) indicating the miscibility of the blend systems. Moreover, the changes in the melting temperature (Tm), shape and area were attributed to the different degrees of crystallinity and the existence of polymer-polymer interactions between PVA and HPC molecules. The X-ray diffraction (XRD) analysis showed broadening and sharpening of peaks at different HPC concentrations with PVA. This indicated changes in the crystallinity/amorphosity ratio, and also suggested that the miscibility between the amorphous components of homo-polymers PVA and HPC is possible. The results showed that HPC doped in PVA film can improve the thermal stability of the film under investigation, leading to interesting technological applications.
POEMS Syndrome. A Case Presentation Síndrome de POEMS. Presentación de un caso
Iris González Morales,María Caridad Fragoso Marchante,Orestes álvarez Fernández
MediSur , 2011,
Abstract: The case of an 85 years old patient admitted in the General University Hospital "Dr. Gustavo Aldereguía Lima" of Cienfuegos is presented. The patient would undergo a chronic anemia study with endocrine manifestations compatible with hypothyroidism, organomegaly, peripheral polyneuropathy and skin alterations. These deductions were ratified with the results of the tests and the patient was diagnosed with Poems syndrome (multisystem disorder presenting changes in several organs). An analysis on the clinical findings is presented as well as comments on this case and a brief literary review on the topic. Se presenta el caso de una paciente de 85 a os que ingresó en el Hospital General Universitario "Dr. Gustavo Aldereguía Lima" de Cienfuegos para realizarle un estudio de anemia crónica, con manifestaciones endocrinas compatibles con hipotiroidismo, organomegalia, polineuropatía periférica y alteraciones en la piel, deducción ratificada con el resultado de los exámenes indicados como un síndrome de poems (desorden multisistémico que presenta alteraciones en diferentes órganos). Se realiza un análisis de los hallazgos clínicos y se hacen comentarios acerca de este cuadro y una breve revisión del tema.
Fulfilment assessment of the good clinical practices guidelines for community acquired pneumonia. Evaluación del cumplimiento de la guía de práctica clínica para el tratamiento de la neumonía adquirida en la comunidad.
Iris Gonzalez Morales,Alfredo Darío Espinosa Brito,Gustavo álvarez Amador,María Caridad Fragoso Marchante
MediSur , 2009,
Abstract: Background: Community acquired pneumonia is the most common cause of infections found during the medical practice. Objective: To assess the fulfilment of the good clinical practices guidelines for the treatment of community acquired pneumonia. Methods: Prospective, descriptive study of series of cases developed in the Hospital “Dr. Gustavo Aldereguía Lima” between January, 1st and June 30th, 2006. 500 patients were studied which main diagnosis was pneumonia or bronchial pneumonia. The assessment tool includes four questions. A single-varied analysis was performed, with a confidence interval of 95%. The final result of this measurement was the fulfilment of the guidelines as excellent, fine, acceptable and not well, as well as the outcome in living and dead patients. Results: Patients older than 65 years of age are the most affected by this disease and fatality is also higher in this age group; 40, 6% of admitted patients are classified as type III. Not performing thoracic radiography and inappropriate treatment led to a higher lethality risk. 53, 2 % of the clinical histories reflects a bad fulfillment of the guide, likewise the biggest lethality was found in that group (36,8 percent). Conclusions: The patients with pneumonias non serious are those that more are admitted in the center, with a non negligible lethality, although the highest was found in the classes IV and V of pnemonia, that were considered the most serious pneumonias. The global adherence to the guide can be related with the final outcome of the patient. Fundamento: La neumonía adquirida en la comunidad es la causa más común de infecciones encontradas en la práctica médica. Objetivo: Evaluar el cumplimiento de la guía de práctica clínica para el tratamiento de la neumonía adquirida en la comunidad. Métodos: Estudio descriptivo, prospectivo, de serie de casos realizado en el Hospital “Dr. Gustavo Aldereguía Lima” desde el 1 de enero al 30 de junio del 2006, sobre 500 pacientes con diagnóstico principal al ingreso y egreso de neumonía o bronconeumonía. Se aplicó el instrumento de evaluación vigente en el centro. Se realizó un análisis univariado, con un intervalo de confianza de 95 por ciento. Se midió el cumplimiento de las guías en excelente, bien, regular y mal, así como el desenlace en vivos y fallecidos. Resultados: Los mayores de 65 a os son los que más ingresan por esta causa y en ellos es más alta la letalidad; el 40, 6 % de los pacientes que ingresan se estratifican en la clase III. La no realización de la radiografía de tórax y el tratamiento inadecuado constituyeron mayor
Business Process Reengineering in Government Agencies: Lessons from an Experience in Mexico  [PDF]
Jaime Torres Fragoso
Journal of Service Science and Management (JSSM) , 2015, DOI: 10.4236/jssm.2015.83040
Abstract: This paper is based on the findings from two research projects in the Mexican port subsector and shows evidence that business process reengineering is a viable tool for government reform in Latin America. The paper opens with a brief description of New Public Management (NPM), a model used in recent efforts for state reform in the region of Latin America. The modernization of Mexican ports is based on the NPM paradigm. The following section includes a definition of business process reengineering, its methodology and relevance for the public sector. Subsequently, the development of the projects is outlined, including their main objectives and justification, the methodology used, the participating employees, and the results achieved. The findings of these projects are both significant and thought-provoking. The paper concludes with a series of recommendations for the implementation of business process reengineering in the public sector.
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