Educación a distancia: ¿Una alternativa?

Los continuos avances tecnológicos sumados a metodologías y didácticas de la enseñanza en general, han llevado a las universidades más importantes a plantear nuevos desafíos con el solo objetivo de llegar a lugares donde la enseñanza presencial no es posible por una multiplicidad de factores. La educación a distancia es una modalidad educativa en la que los estudiantes no necesitan asistir físicamente a ningún aula. Normalmente, se envía al estudiante por correo el material de estudio (textos escritos, vídeos, cintas de audio, CD-Roms) y él devuelve los ejercicios resueltos. Hoy en día, se utiliza también el correo electrónico y otras posibilidades que ofrece Internet, fundamentalmente las aulas virtuales. Al aprendizaje desarrollado con las nuevas tecnologías de la comunicación se le llama e- learning. En algunos casos, los estudiantes deben o pueden acudir a algunos despachos en determinadas ocasiones para recibir tutorías, o bien para realizar exámenes. Existe educación a distancia para cualquier nivel de estudios, pero lo más usual es que se imparta para estudios universitario

Improving cystic fibrosis survival as a result of management in a specialized Center with 10-year follow-up

La Fibrosis Quística (FQ), la enfermedad genética más frecuente de la raza blanca, es una patología multisistémica y como tal requiere un abordaje multidisciplinario coordinado para obtener mejores resultados de sobrevida y calidad de vida. Con este propósito se organizó un Centro de Fibrosis Quística (CDFQ) en Mendoza, Argentina, y se diseñó este estudio con el objetivo de evaluar la hipótesis de que la organización y tratamiento de la FQ de acuerdo con normas internacionales, mejora la sobrevida

Unexpected impairment of INa underpins reentrant arrhythmias in a knock-in swine model of Timothy syndrome

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Thoracoscopic resection of a paraaortic bronchogenic cyst

Bronchogenic mediastinal cysts (BMC) represent 18% of primitive mediastinal tumors and the most frequent cystic lesions in this area. Nowadays, BMC are usually treated by VATS. However, the presence of major adhesions to vital structures is often considered as an unfavourable condition for thoracoscopic treatment. The authors report the thoracoscopic treatment of a BMC having dense adhesions to the aortic arch. Diagnosis and surgical treatment is described. Review of the literature and surgical options on this topic are discussed

Surgical management of pulmonary inflammatory pseudotumors: A single center experience

<p>Abstract</p> <p>Background</p> <p>The pulmonary inflammatory pseudotumor (PIP) is a rare disease. It is still debated whether it represents an inflammatory lesion characterized by uncontrolled cell growth or a true neoplasm. PIP is characterized by a cellular polymorphism.</p> <p>Methods</p> <p>We retrospectively analyzed 8 patients with PIP treated by surgery between 2001 and 2009. Preoperative thoracic computed tomography (CT) scan was performed in all cases. All patients underwent preoperative bronchoscopy with washing and brushing and/or transbronchial biopsy and preoperative cytology examination</p> <p>Results</p> <p>There were 5 men and 3 women, aged between 38 and 69 years (mean of 58 years). 3 patients (37%) were asymptomatic. The others had symptoms characterized by chest pain, shortness of breath and persistent cough or hemoptysis. 5 patients had neutrophilic leucocytosis. CT scan demonstrated solitary nodules (maximum diameter <3 cm) in 5 patients (62%) and lung masses (maximum diameter >3 cm) in 3 patients (37%). In 2 patients there were signs of pleural infiltration. Distant lesions were excluded in all cases. A preoperative histology examination failed to reach a definitive diagnosis in all patients. At surgery, we performed two lobectomies, one segmentectomy and five wedge resections, these being performed with videothoracoscopy (VATS), except for one patient where open surgery was used. Complete tumor resection was obtained in all patients. According to the Matsubara classification, there were 2 cases of organizing pneumonia, 5 cases of fibrous histiocytoma and one case of lymphoplasmacytoma. All patients were discharged alive from hospital between 4 and 7 days after surgery. At follow-up CT scan performed annually (range 11 to 112 months) (mean 58 months), there were no residual lesions, neither local nor distant recurrences.</p> <p>Conclusions</p> <p>PIP is a rare disease. Many synonyms have been used for this disease, usually in relation to the most represented cell type. The true incidence is unclear. Preoperative diagnosis is difficult to reach, despite performing a bronchoscopy or a transparietal needle aspiration. Different classifications have been proposed for PIP. Either medical, radiation or surgical therapy has been used for PIP. Whenever possible, surgery should be considered the standard treatment. Complete surgical resection is advocated to prevent recurrence.</p

La modelización matemática en economía

p. 133-147A través de un estudio de caso se muestra la posibilidad de modificar prácticas matemáticas para la formulación de problemas con aplicaciones a la economía. Se incorpora, además de la innovación didáctica dentro del aula, elementos teóricos que permiten analizar los datos experimentales, revelando aspectos de la modelación matemática que no se hacen evidentes en análisis más convencionales. La investigación se centró en la exploración de cómo los alumnos resuelven problemas concretos de costos, capitalización y Ley de oferta y demanda, excedente del consumidor y/o productor y cómo es la relación que establecen entre conocimientos matemáticos y económicos. Para llevarla a cabo se usó como metodología las técnicas de aprendizaje colaborativo y cooperativo.Fil: Matulovich, Miriam Isabel. Universidad Nacional de Salta. Facultad de Ciencias Económicas; Argentina.Fil: Lentini, Marta Lucía. Universidad Nacional de Salta. Facultad de Ciencias Exactas; Argentina.Fil: Lentini, María Cristina. Universidad Nacional de Salta. Facultad de Ciencias Exactas; Argentina.Fil: Casado, Eduardo Zenón. Universidad Católica de Salta; Argentina.Fil: Crespo, Beatriz del Pilar. Universidad Nacional de Salta. Facultad de Ciencias Económicas; Argentina

Educación a distancia : ¿Una alternativa?

p. 117-131Los continuos avances tecnológicos sumados a metodologías y didácticas de la enseñanza en general, han llevado a las universidades más importantes a plantear nuevos desafíos con el solo objetivo de llegar a lugares donde la enseñanza presencial no es posible por una multiplicidad de factores. La educación a distancia es una modalidad educativa en la que los estudiantes no necesitan asistir físicamente a ningún aula. Normalmente, se envía al estudiante por correo el material de estudio (textos escritos, vídeos, cintas de audio, CD-Roms) y él devuelve los ejercicios resueltos. Hoy en día, se utiliza también el correo electrónico y otras posibilidades que ofrece Internet, fundamentalmente las aulas virtuales. Al aprendizaje desarrollado con las nuevas tecnologías de la comunicación se le llama e- learning. En algunos casos, los estudiantes deben o pueden acudir a algunos despa- chos en determinadas ocasiones para recibir tutorías, o bien para realizar exámenes. Existe educación a distancia para cualquier nivel de estudios, pero lo más usual es que se imparta para estudios universitarios.Fil: Matulovich, Miriam Isabel. Universidad Nacional de Salta. Facultad de Ciencias Económicas; Argentina.Fil: Lentini, Marta Lucía. Universidad Nacional de Salta. Facultad de Ciencias Exactas; Argentina.Fil: Lentini, María Cristina. Universidad Nacional de Salta. Facultad de Ciencias Exactas; Argentina.Fil: Casado, Eduardo Zenón. Universidad Católica de Salta; Argentina.Fil: Crespo, Beatriz del Pilar. Universidad Nacional de Salta. Facultad de Ciencias Económicas; Argentina

The influence of the southern annular mode(SAM) over the sea surface temperatures in the southwestern Atlantic

Sea surface temperature (SST) is shown to be an important key player to the studying of air-sea interaction phenomenon and in the determination of the regional and global climate variability. Recently, the Southern Annular Mode (SAM) has been recognized as one the most important modes of variability in the Southern Hemisphere, acting on different time scales which varies from the intraseasonal to the interannual variability. SAM is characterized by a modification in the atmospheric circulation pattern between high and mid latitudes, which modifies the meridional position of the western winds. Therefore, the objective of the present work is to investigate the influence of SAM over the SST in the southwestern Atlantic Ocean (SWAO) (18 \ub0S 58 \ub0S, 18 \ub0W 70 \ub0W), by means of computing the correlation between SST anomalies and the SAM index. Nine years of daily SST images from the Pathfinder best SST, with a spatial resolution of 9 x 9 km and encompassing the period of January 1993 to December 2001 have been used. SST anomalies (SSTA) were extracted after the removal of the annual and semi-annual components of the seasonal cycle of the original dataset. Correlation between the SAM index and SSTA was calculated for each grid point and used to construct a synthetic map of the spatial correlation. Correlation indices vary from -0.3 to 0.5 for most of the area of study. High positive values were observed over the Argentinean continental shelf between 36 e 56 \ub0S, whereas high negative values occurred in the offshore region between 18 e 32 \ub0S. Investigation of a potential relationship between the largest negative values of correlation observed over the continental shelf off Argentina and the wind components was also addressed. The wind product is derived from QuickScat, with a spatial resolution of 0.25 x 0.25 degrees and covering the period of January 1999 to December 2004. Correlation indices vary from -0.5 to 0.5 for the SWAO, but the largest positive correlation values were observed in the offshore region between 18 e 32 \ub0S and latitudes higher than 52 \ub0S, whereas the largest negative values took place in the offshore region between 36 e 48 \ub0S. Opposite to what was expected, the correlation was not significant over the Argentinean continental shelf, which, in turn, suggests that other physical processes should be driven the variability in this region. Our results suggest that the SAM index influences and contributes to the SSTA behavior in the SWAO, although this variability may be caused by other physical mechanisms which deserve further investigation.Pages: 1427-143

Physical processes that drive the seasonal evolution of the Southwestern Tropical Atlantic Warm Pool

International audienceThe thermodynamics of the seasonal evolution of the Southwestern Tropical Atlantic Warm Pool (hereafter SWTAWP), which is delimited by the 28 °C isotherm, is investigated using the Regional Ocean Modeling System (ROMS). Results indicate that the net heat flux is responsible for the appearance and extinction of the SWTAWP. From March to May, the SWTAWP attains its maximum development and sometimes merges with equatorial warm waters towards the African continent, whose development follows the same period. Along the equator, the combination of oceanic terms (i.e., advection and diffusion) is important to promote the separation – when it occurs – of equatorial warm waters from southwestern tropical waters, which develops off the Brazilian coast. An analysis of the relative contribution of the temperature tendency terms of the mixed layer (ML) heat budget over the appearance, development and extinction of the SWTAWP is also done. The most important term for warming and cooling inside of the ML is the net heat flux at the sea surface. The ML is heated by the atmosphere between October and April, whereas the upper ocean cools down between May and September. The highest heat content values occur during the lower-temperature period (August to October), which is linked to the deepening of the ML during this time period. The horizontal advection along the equator is important, particularly at the eastern domain, which is influenced by the cold tongue. In this area, the vertical diffusive term is also significant; however, it presents values near zero outside the equator. These results contribute to a better understanding of the behavior of the heat budget within the tropical Atlantic, as previous studies over this region focused along the equator only