Mostrando recursos 1 - 20 de 35.872

  1. Metronidazol en el tratamiento de periodontitis experimentales: Estudio Histomorfométrico

    Gordillo, María; Meheris, Hector; Ruiz Holgado, Nora; López Marí, Laura; Garat, Miranda Juan
    El metronidazol es una droga perteneciente al grupo de Nitroimidazoles, que ejerce su efecto sobre tricomonas, espiroquetas y microorganismos anaeróbicos. Es ampliamente conocido que la enfermedad periodontal no solo está determinada por la cantidad y calidad de microorganismos, sino también por el importante rol que desempeñan los anaerobios Gram negativos, frente a las diferentes respuestas del hospedero. Desde ese marco son numerosos los trabajos clínicos y bacteriológicos que estudiaron la acción del metronidazol en el tratamiento de esta afección. Este trabajo fue diseñado para estudiar por métodos histomorfométricos la respuesta del hueso alveolar frente a una peridontitis experimental inducida por...

  2. Identidad sociopolítica delictiva en México

    García Lirios, Cruz; Carreón Guillén, Javier; Hernández Valdés, Jorge; Mejía Rubio, Silvia; García Estrada, Erle; Rosas Ferrusca, Francisco Javier
    La relación entre sociedad y Estado ha sido estudiada desde una lógica del poder jurídico-político en el que la rectoría de los gobernantes y el control delictivo son indispensables para explicar la seguridad pública ciudadana, pero si este fenó- meno se observa desde una lógica de la influencia social en la que al interior de la ciudadanía se gestan percepciones de inseguridad y riesgo que explican la formación de emociones y opiniones desfavorables al accionar gubernamental, entonces el concepto de identidad sociopolítica permite esclarecer el proceso por medio del cual la ciudadanía atribuye a la corrupción, negligencia, nepotismo u opacidad...

  3. Viabilidad de espermatozoides epididimales caninos y felinos almacenados bajo diferentes condiciones

    Tittarelli, Claudia Marcela
    El objetivo general de esta tesis fue estudiar la sobrevida de EE caninos y felinos almacenados en EPI modificando las condiciones y el tiempo de almacenado transcurrido hasta la recuperación de las gametas para aumentar el número de espermatozoides viables. Los objetivos específicos fueron: 1) comparar el efecto de diferentes medios sobre la supervivencia de EE almacenados a 4ºC durante distintos periodos dentro del EPI; 2) evaluar el efecto de diferentes medios sobre la temperatura alcanzada en el interior del EPI a 4ºC; 3) evaluar los cambios autolíticos de las células epididimales durante el almacenamiento del órgano a 4ºC por...

  4. Preparação e caracterização de micro/nanopartículas de quitosano para libertação de cisplatina

    Martins, Salomé Portelas
    Nos últimos anos, a crescente necessidade de desenvolvimento de novos e inovadores sistemas para a libertação de fármacos, tem levado a comunidade científica à pesquisa de novos materiais, maioritariamente de origem polimérica. O aparecimento destes materiais abre novas possibilidades aos campos de investigação da medicina e farmacologia, uma vez que os polímeros podem ser facilmente modificados (por reticulação física ou química) e processados nas mais diversas formas. Entre os novos materiais estudados encontra-se o quitosano, um polímero de origem natural extraído das carapaças de animais marinhos. O quitosano tem sido exaustivamente investigado devido a um conjunto de características, como biocompatibilidade, biodegradabilidade...

  5. Noves dades parasitològiques en micromamífers (insectívors i rosegadors) del Sud-Est Asiàtic (Cambodja, Laos i Tailàndia)

    Veciana Botet, Marina
    Els estudis d’helmints paràsits de rosegadors (ordre Rodentia) són abundants a la península Ibèrica i, han sigut realitzats en gran part per l’equip d’helmintologia del Departament de Microbiologia i Parasitologia Sanitàries (Facultat de Farmàcia, Universitat de Barcelona). Segons l’Atlas de los Mamíferos terrestres de España (1) hi ha 19 espècies de rosegadors excloent les espècies al·lòctones. La recopilació de Feliu et al. (1997) recull dades d’helmints de 16 espècies de rosegadors (2). Si hi afegim els estudis de Sciurus vulgaris (3) i de Glis glis (4) concloem que a excepció de Apodemus flavicollis s’han estudiat totes les espècies de rosegadors...

  6. Aprendizaje de contenidos de óptica geométrica utilizando software didáctico

    Ansise Chirino, Sandra; Palma, Nélida; Rodríguez, Gabriel Alfredo
    The purpose of this paper is to evaluate the effectiveness that has the use of Information and communication technologies (ICT) .in the production of meaningful learning in engineering careers. We are introducing a strategy of active learning using simulations, in the interest of ensuring that our students understand and apprehend the concepts of Geometrical Optics and thus can make use of them. The results were evaluated and it was found that the simulation learning achievement better understanding of the issues mentioned above.

  7. Anatomia do circuito arterial do encéfalo em Tamanduá-mirim

    Lima, Ana Rita; Pereira, Luiza Corrêa; Branco, Érika
    The arterial circuit of the brain is of great importance because it is responsible for vascularization of the brain and this is the main organ of the central nervous system and responsible for receiving and processing information. The species was chosen because it is a mammal belonging to the Xenarthra order and the members of this order are little studied because of the difficulty of access to these animals. To develop this work were studied five specimens of lesser anteater (Tamandua tetradactyla). The material had the arterial system filled with Neoprene latex stained in red, fixed in aqueous solution of...

  8. Saberes e práticas da residência multiprofissional em saúde no cotidiano de trabalho em atenção primária à saúde de cirurgiões-dentistas

    Moschen, Adriana Zanon
    Este estudo busca identificar como a integralidade em saúde, vivenciada em Programas de Residência Multiprofissional em Saúde (RMS), toma corpo e forma no cotidiano de trabalho de Cirurgiões-Dentistas na Atenção Primária à Saúde. Pretende investigar as limitações e as possibilidades encontradas pelos egressos desta modalidade de formação em serviço para implantarem uma atenção à Saúde Bucal cujo foco de atuação seja a integralidade das ações. A pesquisa utiliza uma abordagem qualitativa. Como técnica de coleta de dados foi privilegiada a entrevista semiestruturada com egressos da RMS. De forma a complementar os dados, foi realizada uma entrevista com preceptores das RMS...

  9. Empleabilidad: análisis del concepto

    Suárez Lantarón, Belén
    El trabajo que aquí se presenta tiene como objetivo la revisión del término Empleabilidad. Un concepto usado casi por todos, generalmente vinculado con la obtención o no de empleo. Para ello, la metodología elegida es la revisión bibliográfica. Los resultados encontrados muestran la existencia de una vasta literatura en relación con la empleabilidad. Este término es estudiado desde diferentes ópticas y múltiples disciplinas, resultando un concepto complejo que ha ido evolucionando, pues además de poseer una connotación de capacidad de inserción laboral, define una relación entre organizaciones, trabajo y aprendizaje. Basándonos en esto, concluimos que la empleabilidad no puede ser...

  10. Comentario a la STC 155/2014, de 25 de septiembre : La constitucionalidad de la incompatibilidad de los Presidentes de las Corporaciones o Entidades Locales con el mandato de Diputado del Parlamento de Andalucía

    Greciet García, Esteban
    Aquest article es proposa comentar la sentència esmentada en el títol des d’una òptica que unesca la contraposició dels arguments de les parts amb els raonaments del Tribunal Constitucional mateix i, en especial, amb els principis i els arguments que li porten a una interpretació decisiva per a la sentència. En l’apartat de conclusions s’inclouen observacions sobre el concepte de les incompatibilitats parlamentàries en la sentència, la noció de transparència que aquesta deixa traslluir i la connexió d’aquesta resolució amb altres recents del mateix tribunal amb relació a la democràcia en les entitats locals.

  11. Experimental Toxoplasmosis in Rats Induced Orally with Eleven Strains of Toxoplasma gondii of Seven Genotypes: Tissue Tropism, Tissue Cyst Size, Neural Lesions, Tissue Cyst Rupture without Reactivation, and Ocular Lesions.

    Jitender P Dubey; Leandra R Ferreira; Mohammad Alsaad; Shiv K Verma; Derron A Alves; Gary N Holland; Glenn A McConkey
    The protozoan parasite Toxoplasma gondii is one of the most widely distributed and successful parasites. Toxoplasma gondii alters rodent behavior such that infected rodents reverse their fear of cat odor, and indeed are attracted rather than repelled by feline urine. The location of the parasite encysted in the brain may influence this behavior. However, most studies are based on the highly susceptible rodent, the mouse.Latent toxoplasmosis was induced in rats (10 rats per T. gondii strains) of the same age, strain, and sex, after oral inoculation with oocysts (natural route and natural stage of infection) of 11 T. gondii strains...

  12. Numerical Analysis of Thermal Dependence of the Spectral Response of Polymer Optical Fiber Bragg Gratings

    Hisham K. Hisham
    The thermal dependence of the spectral response (i.e. transmission, reflection and time delay (r) responses) of uniform polymer optical fiber (POF) Bragg gratings has been investigated. In addition to the temperature dependence, the effects of grating strength (kLg) and fiber index modulation (n) have been investigated. Besides high capability of tunable wavelength due to the unique large and negative thermo-optic coefficient of POF, the spectral response for POF Bragg gratings show high stability and larger spectrum bandwidth with temperature variation compare with the silica optical fiber (SOF) Bragg gratings, especially with the increase of the kLg value. It was found that by increasing kLg, the peak...

  13. A Thermal Performance Analysis and Comparison of Fiber Coils with the D-CYL Winding and QAD Winding Methods

    Xuyou Li; Weiwei Ling; Kunpeng He; Zhenlong Xu; Shitong Du
    The thermal performance under variable temperature conditions of fiber coils with double-cylinder (D-CYL) and quadrupolar (QAD) winding methods is comparatively analyzed. Simulation by the finite element method (FEM) is done to calculate the temperature distribution and the thermal-induced phase shift errors in the fiber coils. Simulation results reveal that D-CYL fiber coil itself has fragile performance when it experiences an axially asymmetrical temperature gradient. However, the axial fragility performance could be improved when the D-CYL coil meshes with a heat-off spool. Through further simulations we find that once the D-CYL coil is provided with an axially symmetrical temperature environment, the...

  14. Survey of intravitreal injection techniques among retina specialists in Israel

    Segal O; Segal-Trivitz Y; Nemet AY; Geffen N; Nesher R; Mimouni M
    Ori Segal,1,2 Yael Segal-Trivitz,1,3 Arie Y Nemet,1,2 Noa Geffen,1,2 Ronit Nesher,1,2 Michael Mimouni4 1Department of Ophthalmology, Meir Medical Center, Kfar Saba, 2The Sackler School of Medicine, Tel Aviv University, Tel Aviv, 3Department of Psychiatry, Geha Psychiatric Hospital, Petah Tikva, 4Department of Ophthalmology, Rambam Health Care Campus, Haifa, Israel Purpose: The purpose of this study was to describe antivascular endothelial growth factor intravitreal injection techniques of retinal specialists in order to establish a cornerstone for future practice guidelines. Methods: All members of the Israeli Retina Society were contacted by email to complete an anonymous, 19-question, Internet-based survey regarding their intravitreal injection...

  15. SOLUCIÓN DE LA ECUACIÓN NO LINEAL DE SCHRODINGER (1+1) EN UN MEDIO KERR

    Francis Armando Segovia; Emilse Cabrera

    Se presenta un marco teórico y se muestra una simulación numérica de la propagación de solitones. Con especial atención a los solitones ópticos espaciales, se calcula analíticamente el perfil de solitón correspondiente a la ecuación Schrodinger no-lineal para un medio Kerr. Los resultados muestran que los solitones ópticos son pulsos estables cuya forma y espectro son preservados en grandes distancias.

    Solution of the nonlinear Schrodinger equation (1+1) in a Kerr medium

    ABSTRACT

    This document presents a theoretical framework and shows a numerical simulation for the propagation of solitons. With special attention to the spatial optical solitons, we calculates analytically the profile of solitón...

  16. Caracterización morfológica de películas delgadas de cu/cd obtenidas por electrodeposición

    William Arnulfo Aperador-Chaparro; Ariel Camargo-López; César Armando Ortiz-Otálora; Enrique Vera-López
    This work presents the use of the technique of current pulsant inverse, pulse direct current and direct current for electrodeposition thin films Cu/Cd in double-layer shape on Zamak substrate. The influence of the different variables was studied involved in each one of the processes: voltage and time of deposition (VHigh and VLow), voltage and time of breakup (VLow and tLow) and the load cycle ( =tHigh/tHigh+tLow), obtaining the average of the anodic (ILow) and cathodic (IHigh) currents as a function of the anodic (tLow) and cathodic (tHigh) times, respectively. The electrodeposits of Cu/Cd were characterized by means of optic microscopy...

  17. Empirical Determination of Optimal Parameters for Sodium Double-Edge Magneto-Optic Filters

    Barry Ian F.; Huang Wentao; Smith John A.; Chu Xinzhao
    A method is proposed for determining the optimal temperature and magnetic field strength used to condition a sodium vapor cell for use in a sodium Double-Edge Magneto-Optic Filter (Na-DEMOF). The desirable characteristics of these filters are first defined and then analyzed over a range of temperatures and magnetic field strengths, using an IDL Faraday filter simulation adapted for the Na-DEMOF. This simulation is then compared to real behavior of a Na-DEMOF constructed for use with the Chu Research Group’s STAR Na Doppler resonance-fluorescence lidar for lower atmospheric observations.

  18. The System of the Calibration for Visibility Measurement Instrument Under the Atmospheric Aerosol Simulation Environment

    Shu Zhifeng; Yang ShaoChen; Xu Wenjing
    Visibility is one of the most important parameters for meteorological observation and numerical weather prediction (NWP).It is also an important factor in everyday life, mainly for surface and air traffic especially in the Aeronautical Meteorology. The visibility decides the taking off and landing of aircraft. If the airport visibility is lower than requirement for aircraft taking off stipulated by International Civil Aviation Administration, then the aircraft must be parked at the airport. So the accurate measurement of visibility is very important. Nowadays, many devices can be measured the visibility or meteorological optical range (MOR) such as Scatterometers, Transmissometers and visibility...

  19. Integrated Path Detection of Co2 and CH4 Using a Waveform Driven Electro-Optic Single Sideband Laser Source

    Wagner Gerd; Maxwell Stephen; Plusquellic David
    Integrated path concentrations of ambient levels of carbon dioxide and methane have been measured during nighttime periods at NIST, Boulder (CO, USA), using a ground-based, eyesafe laser system. In this contribution, we describe the transmitter and receiver system, demonstrate measurements of CO2 and CH4 in comparison with an in situ point sensor measurement using a commercial cavity ring-down instrument, and demonstrate a speckle noise reduction method.

  20. Exploring the Turbulent Urban Boundary by Use of Lidars and Microwave Radiometers

    Arend Mark; Valerio Ivan; Neufeld Stephen; Bishir Raymond; Wu Younghu; Moshary Fred; Melecio-Vazquez David; Gonzalez Jorge
    A Doppler lidar has been developed using fiber optic based technologies and advanced signal processing techniques. Although this system has been operated in a scanning mode in the past, for this application, the system is operated in a vertically pointing mode and delivers a time series of vertical velocity profiles. By cooperating the Doppler lidar with other instruments, including a back scatter lidar, and a microwave radiometer, models of atmospheric stability can be tested, opening up an exciting path for researchers, applied scientists and engineers to discover unique phenomena related to fundamental atmospheric science processes. A consistent set of retrievals...

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