Effect of platelet-rich plasma on healing of class III furcation defects treated with autogenous bone grafting and guided tissue regeneration: a histomorphometric study in dogs

The purpose of this study was to evaluate the effects of the platelet-rich plasma (PRP) when used in combination with autogenous bone graft and bioabsorbable membrane (Resolut® ) in the treatment of Class  III furcation defects in dogs. Material and method: Class III furcation defects (5 mm in height and in depth) were surgically created in the mandibular third premolars of five mongrel dogs. After nine weeks, the lesions were treated with scaling and root planning and each defect received one of the following treatments: autogenous bone graft + membrane (group C) or PRP + autogenous bone graft + membrane (group T). After a healing period of 90 days, the animals were sacrificed. Routine histological processing and staining with hematoxilyn and eosin and Masson trichrome were performed and a histomorphometric analysis determined the effect of the treatments on periodontal tissue regereneration. Data were analyzed by Hotelling’s T-squared (p < 0.05). Result: No statistically significant difference between C and T groups was observed by the histomorphometric analysis of the furcation area. Both treatment groups demonstrated similar regenerative results with the furcation defects partially filled and periodontal regeneration limited to the experimental notches of the lesions. (p > 0.05). Conclusion: According to the present results, PRP does not enhance the periodontal regeneration in class III furcation defects treated with autogenous bone graft and bioabsorbable membrane.

Pinos transcorticais e gesso associados à aplicação local de plasma rico em plaquetas no tratamento de fratura do III metatarsiano em potro

In horses less than one year of age fractures of the third metacarpal bone (McIII) or metatarsal bone III (MtIII) are mainly attributed to trauma. Open reduction and internal fixation are the most common treatment method. A Quarter Horse filly with three months of age, which weighed 150kg presented a diaphyseal multifragmentar wedge fracture of right MtIII which was treated with transcortical pins and cast, associated with intralesional application of platelet rich plasma (PRP). After two years of surgery, the animal initiated a training program for racing, and six months later, the patient ran its first official match. The choice of therapeutic methods for treating fractures in horses should be one that provides an earlier repair and minor possibility of complications. Thus, the therapy association which was adopted was considered favorable, since allowed full reestablishment of locomotion of the patient and made possible its return to race.

Estimulación de la producción de compuestos polifenólicos en microalgas cultivadas en condiciones de estrés oxidativo por altas concentraciones de hierro (III) y cobre (II)

[EN] The study investigates the phenolic profile of exudates and extracts of several microalgae harvested in natural seawater in the presence and absence of Cu and Fe additions, at metal levels of environmental relevance. The experimental findings show changes in the concentrations and types of polyphenols as a function of the metal added and its spiked concentrations. The results shown might be useful to help explaining the dynamics of this important class of compounds in seawater and also encourage further studies aimed at using algae as a source of chemical principles to be used in the health, food and pharmaceutical industry.

Bibliografia Luso-Judaica : Noticia subsidiaria da coleccao de Alberto Carlos da Silva

coordenado par Alvaro Néves

Espacio, comunicación y cultura III. Movilidades / inmovilidades de cuerpos y de signos en el espacio social público de una ciudad en transformación. 16H238

Este proyecto es una continuidad de investigaciones previas centradas en el análisis comunicacional y sociocultural de actuales procesos de reurbanización de la ciudad de Posadas. Para ello, se prioriza una perspectiva relacional/sociocultural y política y se recurre a aportes teórico-metodológicos de varias disciplinas, en particular de la Comunicación Social, la Semiótica, el Análisis del Discurso, la Sociología y la Antropología Social. Se busca en esta instancia abordar la dimensión simbólica de una dinámica urbana - en este caso de una ciudad como Posadas-, en correlación con un orden urbano emergente y hegemónico que viene generando modificaciones profundas en su configuración (tanto en su trazado como en su trama social). Partimos para ello de los efectos de sentido de divisiones del espacio urbano posibilitadas por la reurbanización que habilitan nuevas oposiciones entre sus habitantes; promueven ciertos flujos y prácticas de espacio, pero también exclusiones y “refuerzos de fronteras” (territoriales, sociales, simbólicas); acorde con “un discurso de lo urbano” y con políticas de espacio que buscan instituir un “modelo de ciudad” y por ende un modo de concebir /habitar/convivir en la ciudad profundamente signado por el mercado. De allí que se busque focalizar el análisis en producciones discursivas y prácticas sociales vinculadas por un lado con espacios de alta densidad de la ciudad (“la costa” y “el centro”); y por otro con disputas –pasadas y presentes- por el suelo urbano y el espacio público; como un modo posible más de aproximación a la conflictividad de las sociedades contemporáneas.

Carmen de Carlos Saura : El personaje de Antonio en diálogo con el pasado literario y operístico

Nos proponemos en este trabajo analizar la lectura que el cineasta español Carlos Saura realiza, hacia 1983, de dos textos que preceden al film: la nouvelle 'Carmen' de Próspero Mérimée, de 1845, y la ópera del mismo nombre, estrenada en Francia en 1875, de Georges Bizet. Estas dos obras constituyen una referencialas necesaria en este trabajo, pero nuestro análisis focaliza la original construcción que el cineasta español hace del personaje de Antonio. Consideramos que la 'Carmen' de Carlos Saura y el tratamiento que le da al coprotagonista de la historia, nos enfrenta a un nuevo fenómeno estético que desestabiliza los términos de lo convencional. Intermedialidad, intertextualidad, arte postmoderno son categorías teóricas que nos permiten hacer una lectura del film, a través del tratamiento particular que Saura da a la figura de Antonio, para poner en evidencia la complejidad de la relación cine-literatura

Carmen de Carlos Saura : El personaje de Antonio en diálogo con el pasado literario y operístico

Nos proponemos en este trabajo analizar la lectura que el cineasta español Carlos Saura realiza, hacia 1983, de dos textos que preceden al film: la nouvelle 'Carmen' de Próspero Mérimée, de 1845, y la ópera del mismo nombre, estrenada en Francia en 1875, de Georges Bizet. Estas dos obras constituyen una referencialas necesaria en este trabajo, pero nuestro análisis focaliza la original construcción que el cineasta español hace del personaje de Antonio. Consideramos que la 'Carmen' de Carlos Saura y el tratamiento que le da al coprotagonista de la historia, nos enfrenta a un nuevo fenómeno estético que desestabiliza los términos de lo convencional. Intermedialidad, intertextualidad, arte postmoderno son categorías teóricas que nos permiten hacer una lectura del film, a través del tratamiento particular que Saura da a la figura de Antonio, para poner en evidencia la complejidad de la relación cine-literatura

Carmen de Carlos Saura : El personaje de Antonio en diálogo con el pasado literario y operístico

Nos proponemos en este trabajo analizar la lectura que el cineasta español Carlos Saura realiza, hacia 1983, de dos textos que preceden al film: la nouvelle 'Carmen' de Próspero Mérimée, de 1845, y la ópera del mismo nombre, estrenada en Francia en 1875, de Georges Bizet. Estas dos obras constituyen una referencialas necesaria en este trabajo, pero nuestro análisis focaliza la original construcción que el cineasta español hace del personaje de Antonio. Consideramos que la 'Carmen' de Carlos Saura y el tratamiento que le da al coprotagonista de la historia, nos enfrenta a un nuevo fenómeno estético que desestabiliza los términos de lo convencional. Intermedialidad, intertextualidad, arte postmoderno son categorías teóricas que nos permiten hacer una lectura del film, a través del tratamiento particular que Saura da a la figura de Antonio, para poner en evidencia la complejidad de la relación cine-literatura

Si(100) versus Ge(100): Watching the interface formation for the growth of III-V-based solar cells on abundant substrates

We investigated the atomic surface properties of differently prepared silicon and germanium (100) surfaces during metal-organic vapour phase epitaxy/chemical vapour deposition (MOVPE/MOCVD), in particular the impact of the MOVPE ambient, and applied reflectance anisotropy/difference spectroscopy (RAS/RDS) in our MOVPE reactor to in-situ watch and control the preparation on the atomic length scale for subsequent III-V-nucleation. The technological interest in the predominant opto-electronic properties of III-V-compounds drives the research for their heteroepitaxial integration on more abundant and cheaper standard substrates such as Si(100) or Ge(100). In these cases, a general task must be accomplished successfully, i.e. the growth of polar materials on non-polar substrates and, beyond that, very specific variations such as the individual interface formation and the atomic step structure, have to be controlled. Above all, the method of choice to grow industrial relevant high-performance device structures is MOVPE, not normally compatible with surface and interface sensitive characterization tools, which are commonly based on ultrahigh vacuum (UHV) ambients. A dedicated sample transfer system from MOVPE environment to UHV enabled us to benchmark the optical in-situ spectra with results from various surfaces science instruments without considering disruptive contaminants. X-ray photoelectron spectroscopy (XPS) provided direct observation of different terminations such as arsenic and phosphorous and verified oxide removal under various specific process parameters. Absorption lines in Fourier-transform infrared (FTIR) spectra were used to identify specific stretch modes of coupled hydrides and the polarization dependence of the anti-symmetric stretch modes distinguished different dimer orientations. Scanning tunnelling microscopy (STM) studied the atomic arrangement of dimers and steps and tip-induced H-desorption proved the saturation of dangling bonds after preparati- n. In-situ RAS was employed to display details transiently such as the presence of H on the surface at lower temperatures (T <; 800°C) and the absence of Si-H bonds at elevated annealing temperature and also surface terminations. Ge buffer growth by the use of GeH4 enables the preparation of smooth surfaces and leads to a more pronounced amplitude of the features in the spectra which indicates improvements of the surface quality.

Integration of III-V materials on Silicon Substrates for Multi-junction Solar Cell Applications

The work presented here aims to reduce the cost of multijunction solar cell technology by developing ways to manufacture them on cheap substrates such as silicon. In particular, our main objective is the growth of III-V semiconductors on silicon substrates for photovoltaic applications. The goal is to create a GaAsP/Si virtual substrates onto which other III-V cells could be integrated with an interesting efficiency potential. This technology involves several challenges due to the difficulty of growing III-V materials on silicon. In this paper, our first work done aimed at developing such structure is presented. It was focused on the development of phosphorus diffusion models on silicon and on the preparation of an optimal silicon surface to grow on it III-V materials.

XPS as Characterization Tool for PV: From the Substrate to Complete III-V Multijunction Solar Cells

This contribution aims to illustrate the potential of the X-ray photoelectron spectroscopy (XPS) technique as a tool to analyze different parts of a solar cell (surface state, heterointerfaces, profile composition of ohmic contacts, etc). Here, the analysis is specifically applied to III-V multijunction solar cells used in concentrator systems. The information provided from such XPS analysis has helped to understand the physico-chemical nature of these surfaces and interfaces, and thus has guided the technological process in order to improve the solar cell performance.