Análise microbiológica da cavidade interna de implantes dentais osseointegrados utilizando o checkerboard DNA-DNA hybridization

Introduction: Infiltration of organic fluids and microorganisms at the abutment/implant interface may result in bacterial infection of peri-implant tissues. Internal colonization of periodontal pathogens may be caused by bacteria trapped during installation or penetration of abutment/implant leakage. The aim of this study was to detect periodontal pathogens in the internal area of dental implants before loading. Materials and Methods: Seventy-eight implants in 32 partially edentulous subjects were selected for this evaluation. A bacterial biofilm sample of the internal surface of each implant was taken and analyzed for the presence of 40 microorganisms by checkerboard DNA-DNA hybridization, prior to installation of healing or any other prosthetic abutment. Discussion: Bacteria were detected in 20 patients (62.5%), distributed in 41 implants (52.6%). Forty-seven percent of implants showed no bacterial detection. Spontaneous early implant exposure to oral cavity during the healing period was not significant (P >0.05) to increase bacterial prevalence, but implants placed at mandible had higher bacterial prevalence than maxillary ones. Conclusion: The internal surface of dental implants can serve as a reservoir of periodontal pathogens for future implant/abutment interface.

Um algoritmo paralelo eficiente de migração reversa no tempo (rtm) 3d com granularidade fina

The reverse time migration algorithm (RTM) has been widely used in the seismic industry to generate images of the underground and thus reduce the risk of oil and gas exploration. Its widespread use is due to its high quality in underground imaging. The RTM is also known for its high computational cost. Therefore, parallel computing techniques have been used in their implementations. In general, parallel approaches for RTM use a coarse granularity by distributing the processing of a subset of seismic shots among nodes of distributed systems. Parallel approaches with coarse granularity for RTM have been shown to be very efficient since the processing of each seismic shot can be performed independently. For this reason, RTM algorithm performance can be considerably improved by using a parallel approach with finer granularity for the processing assigned to each node. This work presents an efficient parallel algorithm for 3D reverse time migration with fine granularity using OpenMP. The propagation algorithm of 3D acoustic wave makes up much of the RTM. Different load balancing were analyzed in order to minimize possible losses parallel performance at this stage. The results served as a basis for the implementation of other phases RTM: backpropagation and imaging condition. The proposed algorithm was tested with synthetic data representing some of the possible underground structures. Metrics such as speedup and efficiency were used to analyze its parallel performance. The migrated sections show that the algorithm obtained satisfactory performance in identifying subsurface structures. As for the parallel performance, the analysis clearly demonstrate the scalability of the algorithm achieving a speedup of 22.46 for the propagation of the wave and 16.95 for the RTM, both with 24 threads.

Foraminíferos como ferramenta de estudo na geologia ambiental do estuário do Rio Potengi e da plataforma interna, RN, Brasil

The Potengi River estuary has been affected by various anthropogenic factors over the years, as periodic dredging, industrial and domestic waste, traffic and other factors, causing various environmental disasters, including the notorious ecological accident in July 2007, which covered the municipalities of São Gonçalo do Amarante, Macaíba and Natal. Foraminifera serve as viable study tools in these environments; they are able to identify ecologically stressed environments, pointing out hydrographic changes and depositional environments in estuaries. The necessity to check the differences in environmental gradients in places anthropically impacted in Potengi River and adjacent inner shelf through species of foraminifera, and, the responses of these organisms to physical, chemical and geological factors is to provide baseline in the diagnosis of environments. The results show the dominance of opportunistic Ammonia tepida, Bolivina striatula, Quinqueloculina patagonica and Q. miletti especially in regions close to shrimp farms and Baldo Channel sewage in fine grain environments; and Q. lamarckiana indicates penetration of the saline waters in Potengi River. The occurrence of low-salinity tolerant foraminiferal species typical of mangrove environments as Trochammina inflata and T. squamata in Potengi River Channel suggest they probably could have been transported from mangrove area near the Potengi river mouth to the inner shelf regions. These findings suggest Potengi River is able to export mixohaline and mangrove organisms to inner shelf. Two distinct environments were observed, the outermost area is more influenced by marine influence and the innermost area is less influenced. Calcareous and agglutinated species dominate Potengi River, while mouth and inner shelf areas are dominated by calcareous, agglutinated and porcelaneous species, which are typical of highly saline and hydrodynamic environments and the contributive factors that controls foraminiferal distribution were balance of marine and freshwater currents, grain size, availability of CaCO3 and organic matter.

Foraminíferos como ferramenta de estudo na geologia ambiental do estuário do Rio Potengi e da plataforma interna, RN, Brasil

The Potengi River estuary has been affected by various anthropogenic factors over the years, as periodic dredging, industrial and domestic waste, traffic and other factors, causing various environmental disasters, including the notorious ecological accident in July 2007, which covered the municipalities of São Gonçalo do Amarante, Macaíba and Natal. Foraminifera serve as viable study tools in these environments; they are able to identify ecologically stressed environments, pointing out hydrographic changes and depositional environments in estuaries. The necessity to check the differences in environmental gradients in places anthropically impacted in Potengi River and adjacent inner shelf through species of foraminifera, and, the responses of these organisms to physical, chemical and geological factors is to provide baseline in the diagnosis of environments. The results show the dominance of opportunistic Ammonia tepida, Bolivina striatula, Quinqueloculina patagonica and Q. miletti especially in regions close to shrimp farms and Baldo Channel sewage in fine grain environments; and Q. lamarckiana indicates penetration of the saline waters in Potengi River. The occurrence of low-salinity tolerant foraminiferal species typical of mangrove environments as Trochammina inflata and T. squamata in Potengi River Channel suggest they probably could have been transported from mangrove area near the Potengi river mouth to the inner shelf regions. These findings suggest Potengi River is able to export mixohaline and mangrove organisms to inner shelf. Two distinct environments were observed, the outermost area is more influenced by marine influence and the innermost area is less influenced. Calcareous and agglutinated species dominate Potengi River, while mouth and inner shelf areas are dominated by calcareous, agglutinated and porcelaneous species, which are typical of highly saline and hydrodynamic environments and the contributive factors that controls foraminiferal distribution were balance of marine and freshwater currents, grain size, availability of CaCO3 and organic matter.

Dosimetria interna da inalazione in Medicina Nucleare

Scopo di questo lavoro è l’individuazione di una metodica che permetta la valutazione dosimetrica interna dei lavoratori in Medicina Nucleare, dell’I.R.S.T. I radionuclidi impiegati hanno elevata volatilità e tempi di dimezzamento molto brevi quindi, diventa di fondamentale importanza la misura della concentrazione in aria. come radioisotopo d'interesse è stato considerato il F-18. Per la misura della contaminazione in aria è stato utilizzato un sistema progettato dall’azienda MecMurphil (MP-AIR). L’aria attraversa un beaker Marinelli, posto in un pozzetto schermato in piombo (5/6 cm di spessore più rivestimento in rame di 3 mm) nel quale è inserito un rivelatore a scintillazione NaI(Tl) a basso fondo in modalità di campionamento continuo. Attraverso il software MAIR-C, collegato al rivelatore, è stato possibile calibrarlo in energia, FWHM e efficienza. I locali analizzati, poiché quotidianamente frequentati dal personale, sono: Laboratorio caldo, Corridoio, Attesa calda, Camere degenza, e Radiofarmacia. Mediante l’uso di fogli di calcolo, è stata determinata la concentrazione media presente nei diversi locali. I risultati ottenuti hanno mostrato che la concentrazione massima di F-18 è nella radiofarmacia.Le persone con accesso ai locali “caldi” sono state classificate, sulla base delle attività da loro svolte in: medici, TSRM, infermieri e radiofarmacisti. Per ognuna di queste figure è stato stimato il tempo di permanenza all’interno dei locali.Si è proceduto, poi, alla validazione del metodo utilizzato per il calcolo della dose interna per inalazione, applicando quanto riportato nella pubblicazione I.C.R.P. 66, che ha come scopo principale quello di determinare i limiti annuali d’introduzione dei radionuclidi per i lavoratori.Le metodiche, applicate al solo radioisotopo F-18, permettono di ricavare una prima stima della dose inalata dagli operatori, aprendo un’ ampia gamma di possibili sviluppi futuri.

Comportamento mecânico e biológico de implante dentário com interface cônica interna

The general aim of this study was to evaluate the conical interface of pilar/implant. The specific aims were to evaluate the influence of hexagonal internal index in the microleakage and mechanical strength of Morse taper implants; the effect of axial loading on the deformation in cervical region of Morse taper implants of different diameters through strain gauge; the effect of axial loading in cervical deformation and sliding of abutment into the implant by tridimensional measurements; the integrity of conical interface before and after dynamic loading by microscopy and microleakage; and the stress distribution in tridimensional finite element models of Morse taper implants assembled with 2 pieces abutment. According to the obtained results, could be concluded that the diameter had influence in the cervical deformation of Morse taper implants; the presence of internal hexagonal index in the end of internal cone of implant didn´t influenced the bacterial microleakage under static loading neither reduced the mechanical strength of implants; one million cycles of vertical and off-center load had no negative influence in Morse taper implant integrity.

El conflicto con Siemens desde una perspectiva interna

El objetivo del trabajo es analizar, desde una perspectiva teórica, el conflicto suscitado entre el gobierno argentino y la empresa alemana Siemens que se convirtió en motivo de preocupación para los gobiernos que sucedieron a Menem. El conflicto tiene sus orígenes en 1998, cuando la empresa resultó ganadora de un proceso licitatorio, que desde el inicio fue sospechado de corrupción. Se agravó con la sanción de la Ley de Emergencia Económica, en cuyo marco se inició un proceso de renegociación de los términos del contrato original (por no ajustarse este a la realidad económica del país), y alcanzó su máximo nivel en la decisión final del ex presidente Fernando de la Rua de rescindirlo. La envergadura de las negociaciones se hizo evidente desde el momento que el gobierno alemán respaldó explícitamente la posición de la empresa, de manera que un conflicto inicialmente comercial amenazó derivar en uno diplomático. El marco teórico que emplearé para abordar los hechos será el Modelo de Política Burocrática utilizado por Graham Allison en su obra "La esencia de la decisión". Dicho enfoque sostiene que las decisiones de los gobiernos, no son elecciones de actores racionales unitarios, ni procesos determinados por las capacidades organizacionales, sino resultados de los distintos juegos de acuerdos establecidos por los participantes que operan desde el gobierno nacional

Lógica interna y Educación Física. Presentación de un proyecto de investigación

En esta ponencia realizaremos sucintamente la presentación de un proyecto de investigación que ha sido recientemente acreditado en la UNLP (Saraví, 2015). Dicha pesquisa está centrada en el estudio de la lógica interna (Parlebas, 1981, 2001), desde el marco teórico de la Praxiología Motriz. Al respecto, y desde esta perspectiva de análisis, nos interesa indagar en cómo los profesores de Educación Física de la ciudad de La Plata y Ensenada llevan adelante la enseñanza de diferentes prácticas corporales en instituciones educativas, clubes y/o espacios no formalizados. Asimismo buscamos conocer las características y rasgos de algunas de esas prácticas corporales -es decir, su lógica interna-, buscando las articulaciones con la Educación Física y tratando de indagar respecto a sí los profesores de esta disciplina conocen o no el concepto, y como lo utilizan. En este proyecto nos interesa particularmente explicar cómo opera el conocimiento de la lógica interna de esas prácticas en lo que concierne a su enseñanza y-o su gestión por parte de los docentes del área

El conflicto con Siemens desde una perspectiva interna

El objetivo del trabajo es analizar, desde una perspectiva teórica, el conflicto suscitado entre el gobierno argentino y la empresa alemana Siemens que se convirtió en motivo de preocupación para los gobiernos que sucedieron a Menem. El conflicto tiene sus orígenes en 1998, cuando la empresa resultó ganadora de un proceso licitatorio, que desde el inicio fue sospechado de corrupción. Se agravó con la sanción de la Ley de Emergencia Económica, en cuyo marco se inició un proceso de renegociación de los términos del contrato original (por no ajustarse este a la realidad económica del país), y alcanzó su máximo nivel en la decisión final del ex presidente Fernando de la Rua de rescindirlo. La envergadura de las negociaciones se hizo evidente desde el momento que el gobierno alemán respaldó explícitamente la posición de la empresa, de manera que un conflicto inicialmente comercial amenazó derivar en uno diplomático. El marco teórico que emplearé para abordar los hechos será el Modelo de Política Burocrática utilizado por Graham Allison en su obra "La esencia de la decisión". Dicho enfoque sostiene que las decisiones de los gobiernos, no son elecciones de actores racionales unitarios, ni procesos determinados por las capacidades organizacionales, sino resultados de los distintos juegos de acuerdos establecidos por los participantes que operan desde el gobierno nacional

Lógica interna y Educación Física. Presentación de un proyecto de investigación

En esta ponencia realizaremos sucintamente la presentación de un proyecto de investigación que ha sido recientemente acreditado en la UNLP (Saraví, 2015). Dicha pesquisa está centrada en el estudio de la lógica interna (Parlebas, 1981, 2001), desde el marco teórico de la Praxiología Motriz. Al respecto, y desde esta perspectiva de análisis, nos interesa indagar en cómo los profesores de Educación Física de la ciudad de La Plata y Ensenada llevan adelante la enseñanza de diferentes prácticas corporales en instituciones educativas, clubes y/o espacios no formalizados. Asimismo buscamos conocer las características y rasgos de algunas de esas prácticas corporales -es decir, su lógica interna-, buscando las articulaciones con la Educación Física y tratando de indagar respecto a sí los profesores de esta disciplina conocen o no el concepto, y como lo utilizan. En este proyecto nos interesa particularmente explicar cómo opera el conocimiento de la lógica interna de esas prácticas en lo que concierne a su enseñanza y-o su gestión por parte de los docentes del área