Effects of the CPAP Treatment on the NON-REM Sleep Microstructures in Patients with Severe Apnea-Hypoapnea Syndrome

Sleep quality is affected in patients with sleep apnea- hypopnea syndrome (SAHS) with nocturnal and diurnal consequences. Most of these patients who are treated with positive airway pressure (CPAP) return to normal sleep patterns. We could consider good sleepers those patients who present more sleep spindles in stage II, and slower wave sleep as a good sign of better sleep quality. The objective in this research study was to compare the microstructure of stage II using the number of spindles and the increase of slow wave sleep before and after CPAP night titration. We developed a wavelet filter using a spline cubic function from a wavelet mother, which was appropriate to be used over electroencephalographic signal. By means of this filter in a multi-resolution mode, the spindles were detected from the increase of the IV band power; the sampling rate of the device determined the filter characteristics. The staging of polysomnographic studies was made by an expert according AASM (American Academy of Sleep Medicine) and then processed by the filter to get the index of sleep spindles before-and-after CPAP during stage II as well as the relationship between fast and slow powers from the EEG signal. An increase in the power of the slow waves vs. fast activity was observed in all the cases as a feature of better sleep. The neuroprotective effect described in previous research works regarding the density of the sleep spindles seems to be detected in patients improving their sleep quality after the correction of the apnea-hypopnea syndrome using CPAP.Fil: Smurra, Marcela. Gobierno de la Ciudad de Buenos Aires. Hospital General de Agudos Dr. Enrique Tornú; ArgentinaFil: Blanco, Susana Alicia Ana. Universidad de Belgrano. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Eguiguren, Veronica. Gobierno de la Ciudad de Buenos Aires. Hospital General de Agudos Dr. Enrique Tornú; ArgentinaFil: Di Risio, Cecilia Diana. Universidad de Belgrano. Facultad de Ingeniería; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

CCD and photon-counting photometric observations of asteroids carried out at Padova and Catania observatories

We present the results of observational campaigns of asteroids performed at Asiago Station of Padova Astronomical Observatory and at M.G. Fracastoro Station of Catania Astrophysical Observatory, as part of the large research programme on Solar System minor bodies undertaken since 1979 at the Physics and Astronomy Department of Catania University. Photometric observations of six Main-Belt asteroids (27 Euterpe, 173 Ino, 182 Elsa, 539 Pamina, 849 Ara, and 984 Gretia), one Hungaria (1727 Mette), and two Near-Earth Objects (3199 Nefertiti and 2004 UE) are reported. The first determination of the synodic rotational period of 2004 UE was obtained. For 182 Elsa and 1727 Mette the derived synodic period of 80.23+/-0.08 h and 2.981+/-0.001 h, respectively, represents a significant improvement on the previously published values. For 182 Elsa the first determination of the H-G magnitude relation is also presented.Comment: 19 pages, 11 figures, accepted for publication in Planetary and Space Scienc

Pobreza y distribución de ingresos en Mar del Plata entre 2003 y 2015. Un análisis relativo

En el presente trabajo se pretende analizar los resultados alternativos de la evolución de la pobreza y de la distribución de ingresos en el aglomerado Mar del Plata-Batán en el período comprendido entre 2003 y 2015. El estudio se realiza en el marco de la iniciativa de Ciudades Emergentes y Sostenibles del Banco Interamericano de Desarrollo (BID), que fija los lineamientos de comparación internacional a través del criterio de insuficiencia del nivel de ingresos y del índice de Gini, como indicadores de inequidad urbana dentro de la dimensión de sostenibilidad urbana. La fuente de datos es la Encuesta Permanente de Hogares y la valoración de la Canasta Básica Total de la Fundación de Investigaciones Económicas Latinoamericanas (FIEL). Una vez estudiada la evolución a través de una periodización propia, realizamos estudios específicos. En el caso de la pobreza se cuantifican valorizaciones alternativas para la canasta de referencia, así como también se explicita la incidencia del proceso de imputación de los ingresos. En cuanto a la distribución de ingresos se complementa el análisis con curvas de Lorenz tradicionales y generalizadas. Los resultados dan cuenta sobre la relatividad de los mismos y la posibilidad de interpretarlos a través de rangos. En la conclusión reflexionamos sobre la evolución reciente de estos indicadores en la ciudad en relación a los datos nacionales.Fil: Actis Di Pasquale, Eugenio. Universidad Nacional de Mar del Plata. Facultad de Ciencias Económicas y Sociales; Argentina.Fil: Blanco, Germán. Red Mar del Plata Entre Todos; Argentina

Electron iduced light emission in photonic crystals

The interaction of a fast electron with a photonic crystal is studied by solving the Maxwell equations exactly for the external field provided by the electron in the presence of the crystal. The polarization currents and charges produced by the passage of the electron give rise to the emission of the so-called Smith-Purcell radiation. The emitted light probability is obtained by integrating the Poynting vector over planes parallel to the crystal at a large distance from the latter. Both reflected and transmitted light components are analyzed and related to the photonic band structure of the crystal. Emission spectra are compared with the energy loss probability and also with the reflectance and transmittance of the crystal.Comment: 9 pages, 3 figures, nano-7/ecoss-21 proceedings, submitted to Surface Scienc

Smart Vehicle to Grid Interface Project: Electromobility Management System Architecture and Field Test Results

This paper presents and discusses the electromobility management system developed in the context of the SMARTV2G project, enabling the automatic control of plug-in electric vehicles' (PEVs') charging processes. The paper describes the architecture and the software/hardware components of the electromobility management system. The focus is put in particular on the implementation of a centralized demand side management control algorithm, which allows remote real time control of the charging stations in the field, according to preferences and constraints expressed by all the actors involved (in particular the distribution system operator and the PEV users). The results of the field tests are reported and discussed, highlighting critical issues raised from the field experience.Comment: To appear in IEEE International Electric Vehicle Conference (IEEE IEVC 2014

Composition of large and medium-sized mammals in the natural reserve Rincón de Santa María (Corrientes, Argentina): Comparison with its buffer area and conservation status

El presente trabajo tuvo como objetivo realizar una evaluación y comparación de mamíferos medianos y grandes de la reserva Rincón de Santa María y su zona de amortiguamiento. Los registros se realizaron mediante avistamientos directos, búsquedas de rastros y entrevistas, y mostraron una riqueza y tasas de encuentro con mamíferos significativamente mayores para la Reserva. Se registraron especies no citadas, la permanencia de especies propias de bosque en galería y la posible extinción local de otras. El área de estudio parece contener una alta diversidad de mamíferos, por lo que debe ser considerada como un sitio importante para su conservación.The aim of this paper is to evaluate and compare the medium and large mammals of the Santa María Reserve and its buffer zone. The records were obtained using direct sightings, searches of indirect evidence and interviews, showing rates of encounters with mammals and richness significantly higher in the Reserve. We recorded previously unreportes species, the persistence of species typical of gallery forests, and the possible local extinction of other species. The study area appears to contain a high diversity of medium and large mammals, suggesting that it should be considered as an important site for its study and conservation.Fil: Pasian, Constanza. Universidad Nacional de Misiones. Facultad de Ciencias Forestales. Instituto de Biología Subtropical - Sede Puerto Iguazú; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; ArgentinaFil: Di Blanco, Yamil Edgardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste; Argentina. Universidad Nacional de Misiones. Facultad de Ciencias Forestales. Instituto de Biología Subtropical - Sede Puerto Iguazú; ArgentinaFil: Fontana, José Luis. Universidad Nacional del Nordeste. Facultad de Ciencias Exactas, Naturales y Agrimensura. Departamento de Biología; ArgentinaFil: Fariña, Néstor. Corrientes. Dirección de Parques y Reservas. Reserva Natural Rincón Santa María; Argentin

Design of stable metabolic networks

In this work, we propose eigenvalue optimization combined with Lyapunov theory concepts to ensure stability of the Embden—Meyerhof–Parnas pathway, the pentosephosphate pathway, the phosphotransferase system and fermentation reactions of Escherichia coli. We address the design of a metabolic network for the maximization of different metabolite production rates. The first case study focuses on serine production, based on a model that consists of 18 differential equations corresponding to dynamic mass balances for extracellular glucose and intracellular metabolites, and thirty kinetic rate expressions. A second case study addresses the design problem to maximize ethanol production, based on a dynamic model that involves mass balancesfor 25 metabolites and 38 kinetic rate equations. The nonlinear optimization problem including stability constraints has been solved with reduced space Successive Quadratic Programming techniques. Numerical results provide useful insights on the stability properties of the studied kinetic models.Fil: Di Maggio, Jimena Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Blanco, Anibal Manuel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Bandoni, Jose Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; ArgentinaFil: Diaz Ricci, Juan Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Investigaciones Biológicas. Universidad Nacional de Tucumán. Instituto Superior de Investigaciones Biológicas; ArgentinaFil: Díaz, María Soledad. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Planta Piloto de Ingeniería Química. Universidad Nacional del Sur. Planta Piloto de Ingeniería Química; Argentin

Ambulatory surgery for perianal Crohn’s disease. Study of feasibility

Background. One-third of Crohn’s disease (CD) patients present perianal fistula. The gold standard in the diagnosis and treatment of symptomatic perianal disease (PAD) in CD is the exploration of the anal canal and distal rectum under anesthesia (EUA). This procedure is mainly conducted as a day case surgery. Unfortunately, it is not always possible to proceed within the ideal timing and any delay may well represent a relevant clinical issue. The aim of this study was to evaluate the feasibility of outpatient treatment of symptomatic perianal fistulas in CD patients. Methods. All CD patients under regular follow-up at our inflammatory bowel disease referral center, presenting with symptomatic perianal fistulas, were offered surgical consultation. The data of patients were prospectively collected for three years (February 2014 to February 2017) for the purpose of the study. All clinical information, including previous EUA and/or records from MRI and endoscopic ultrasound, was included. Outpatient anal canal and distal rectum exploration and treatment (OE) were undertaken during the specialist surgical consultation. Fistulas were classified according to Parks’s classification; the type of outpatient treatment and compliance of patients were recorded. Pain was assessed by VAS at the time of the procedure and during the first control. Patients were followed up in the surgical clinic in relation to the study. Results. Ninety-two CD patients with symptomatic perianal fistulas had surgical consultation during the study period. OE was offered to all but 18 patients who fulfilled the exclusion criteria or had an extremely severe disease; six patients refused the OE (8.11%). Of the 68 patients undergoing OE, eleven (16.18%) had previous surgery for perianal disease. The OE was accomplished in sixty-one patients (89.71%), while in 7 patients, it was abandoned for scarce compliance. Nine patients (14.75%) underwent drainage of perianal abscess; in 3 of them, it was possible to probe the fistula tract, find the internal orifice, and pass a loose seton. Overall, setonage was performed in 50 patients (81.97%). Rectovaginal setons were placed in 3 patients and more than one seton (up to 3) in 6 cases. Fistulotomy was performed in 4 simple subcutaneous fistulous tracts. Concordance with the preoperative findings was found in 54 out of 61 patients. EUA was scheduled at the time of OE for the 7 patients who did not complete the procedure. All sixty-one patients who had the OE were followed up for a minimum of 12 months. Conclusions. This preliminary study indicates that OE in CD patients with symptomatic perianal fistulas is safe and feasible in a high-volume referral center. It might provide several benefits, including patients’ logistics, reduce or remove patients’ symptoms and discomfort, allow for a timely start of medical therapy, and avoid further complications

The use of social networks within the European Higher Education Area

Este trabajo recoge la experiencia de tres profesores noveles y una profesora mentora tras su participación en el proyecto “Formación del Profesorado Novel”, organizado por el Instituto de Ciencias de la Educación (ICE) de la Universidad de Sevilla durante el curso académico 2011-2012. La incorporación de las redes sociales a la metodología docente universitaria, así como un uso intensivo de la plataforma virtual WebCT, se propusieron como dos de las actividades a desarrollar. El objetivo del artículo es analizar si se produce una mejora en la participación activa y los resultados académicos del alumnado al incorporar tecnologías de la información y las comunicaciones (TICs) como base de las metodologías docentes. Para ello, se ha realizado un experimento de campo utilizando los resultados de tres asignaturas diferentes durante el curso académico 2011-2012: Introducción a las Finanzas, de primer curso, y Mercados Financieros Derivados, de tercer curso, ambas del grado en Finanzas y Contabilidad, y Dirección Financiera, de cuarto curso de la Licenciatura en Administración y Dirección de Empresas. Con este análisis buscamos: (a) contribuir a un mejor conocimiento a la hora de aplicar nuevas tecnologías como metodología docente; y (b) comprobar en qué medida una participación activa del alumno puede pronosticar una buena nota en el examen. Tras la aplicación de estadística descriptiva y análisis de regresión logística (logit), nuestros resultados muestran que aquellos alumnos con una participación más activa en el seguimiento de la asignatura mejoran significativamente su rendimiento académico.This paper describes the experience of three novice lecturers and a mentor lecturer, after their participation in the project "Beginner Teacher Training" organized by the Institute of Education Sciences (ICE) at the University of Seville during the academic year 2011-2012. The incorporation of social networks to the university teaching methodology and an intensive use of the WebCT virtual platform were proposed as two of the activities to be developed. Our objective in this article is to determine if there is an improvement in the student results when new technologies that require active student participation are incorporated as the basis of the teaching methodology. To this end, a field experiment is carried out by using the results of three different subjects for the academic course 2011-2012: Introduction to Finance (first year), Derivatives Financial Markets (third year), both belong to the degree in Finance and Accounting, and Corporate Finance (fourth year) of the degree in Business Administration and Management. With this analysis we aim to: (a) contribute to a better understanding when implementing new technologies into the teaching methodology, and (b) verify to what extent a student's active participation can predict a good mark in the exam. By using descriptive statistics and logistic regression analysis, the results show a marked improvement in the academic performance of those students whose participation is more active in the pursuit of the subject

Synthetic properties of bright metal-poor variables. II. BL Her stars

We investigate the properties of the so-called BL Her stars, i.e., Population II Cepheids with periods shorter than 8 days, using updated pulsation models and evolutionary tracks computed adopting a metal abundance in the range of Z=0.0001 to Z=0.004. We derive the predicted Period-Magnitude (PM) and Period-Wesenheit (PW) relations at the various photometric bands and we show that the slopes of these relations are in good agreement with the slopes determined by observed variables in Galactic globular clusters, independently of the adopted M_V(RR)-[Fe/H] relation to get the cluster RR Lyrae-based distance. Moreover, we show that also the distances provided by the predicted PM and PW relations for BL Her stars agree within the errors with the RR Lyrae based values. The use of the predicted relations with W Vir stars, which are Population II Cepheids with periods longer than 8 days, provides no clear evidence for or against a change in the PM and PW slopes around P~10 days.Comment: 12 pages, 6 figures, 6 tables, accepted for publication in A&A on date 16/05/200