[Voyage en Italie : 1824-1830]. , Du portique près le Forum triangulaire au huitième de l'Exécution : [élévation d'une partie de l'entablement avec le sommet d'une colonne et son chapiteau ionique, coupe du même ensemble, élévation de la base de la colonne] : [dessin] / h. L. [Henri Labrouste]

Référence bibliographique : Weigert, 387

Precision of tibial tunnel placement under arthroscopic control alone in posterior cruciate ligament reconstruction: A radiological study

Introduction: Accurate and reproducible tibial tunnel placement minimizing the risk of neurovascular damage is a crucial condition for successful arthroscopic reconstruction of the posterior cruciate ligament (PCL). This step is commonly performed under fluoroscopic control. Hypothesis: Performing the tibial tunnel under exclusive arthroscopic control allows accurate and reliable tunnel placement according to recommendations in the literature. Materials and Methods: Between February 2007 and December 2009, 108 arthroscopic single bundle PCL reconstructions in tibial tunnel technique were performed. The routine postoperative radiographs were screened according to previously defined quality criterions. After critical analysis, the radiographs of 48 patients (48 knees) were enrolled in the study. 10 patients had simultaneous ACL reconstruction and 7 had PCL revision surgery. The tibial tunnel was placed under direct arthroscopic control through a posteromedial portal using a standard tibial aming device. Key anatomical landmarks were the exposed tibial insertion of the PCL and the posterior horn of the medial meniscus. First, the centre of the posterior tibial tunnel outlet on the a-p view was determined by digital analysis of the postoperative radiographes. Its distance to the medial tibial spine was measured parallel to the tibia plateau. The mediolateral position was expressed by the ratio between the distance of the tunnel outlet to the medial border and the total width of the tibial plateau. On the lateral view the vertical tunnel position was measured perpendicularly to a tangent of the medial tibial plateau. All measurement were repeated at least twice and carried out by two examiners. Results: The mean mediolateral tunnel position was 49.3 ± 4.6% (ratio), 6.7 ± 3.6 mm lateral to the medial tibial spine. On the lateral view the tunnel centre was 10.1 ± 4.5 mm distal to the bony surface of the medial tibial plateau. Neurovascular damage was observed in none of our patients. Conclusion: The results of this radiological study confirm that exclusive arthroscopic control for tibial tunnel placement in PCL reconstruction yields reproducible and accurate results according to the literature. Our technique avoids radiation, facilitates the operation room setting and enables the surgeon to visualize the anatomic key landmarks for tibial tunnel placement.

[Voyage en Italie : 1824-1830]. , Temple de Junon Matuta à Rome. Détails au huitième de l'Exec[uti]on : [élévation partielle d'une colonne (base et chapiteau), d'un entablement et d'une corniche, plusieurs profils] : [dessin] / [Henri Labrouste]

Référence bibliographique : Weigert, 596

[Voyage en Italie : 1824-1830]. , Temple de la Piété à Rome. Détails au huitième de l'Exécution : [profil, élévation partielle d'une colonne (base et chapiteau), d'un entablement et d'une corniche] : [dessin] / [Henri Labrouste]

Référence bibliographique : Weigert, n. d.

[Voyage en Italie : 1824-1830]. , Tombeau de Bibulus à Rome. Détails au quart de l'exéc[u]tion : [détail d'élévation de la frise, avec entablement et chapiteau, détail d'élévation de la base d'une colonne, deux profils] : [dessin] / h. L. [Henri Labrouste]

Référence bibliographique : Weigert, 606

Una nova eina per a l’estudi del paper i les filigranes. Anàlisi i desenvolupament d’una base de dades per a l’estudi del paper i de les filigranes: font per a l’elaboració de la història del paper a Espanya

L’aspiració de trobar una eina que pugui ajudar a identifi car els papers atenent les sevescaracterístiques sorgeix a fi nal segle XVIII amb les primeres descripcions de les filigranespapereres i va prenent cos al segle XIX com a ciència auxiliar de la codicologia.Des de les últimes dècades del segle XX, les filigranes han anat adquirint un interès creixententre els restauradors de document gràfi c —com una eina més per a la presa de decisions i pera la valoració del procés de restauració— i entre els documentalistes, historiadors, museòlegsi bibliòfils —per a la datació i autenticació de les obres— i, fins i tot, en investigacionspolicials i jurídiques per aclarir algun fet delictiu. No obstant això, durant aquests 150 anys, l’estudi del paper a través de les filigranes papereres a Espanya no ha experimentat cap avenç significatiu pel que fa als mètodes i procediments seguits per a l’obtenció i gestió deles dades. En l’àmbit europeu, encara que a partir dels anys 90 sorgeixen noves propostesd’estudi, aquestes limiten la investigació a l’anàlisi de la filigrana sense assolir una visió global del plec sortit de la forma.

La base de dades i servei de sumaris a la Biblioteca de la Universitat de Barcelona

Es presenta el servei de sumaris de la Biblioteca de la Universitat de Barcelona. Els usuaris del servei poden consultar, a través de la web de la biblioteca, els sumaris de les revistes subscrites i rebre els que desitgin per correu electrònic. El servei permet racionalitzar la inversió en subscripcions i mantenir l¿usuari puntualment informat.

3D dose reconstruction for narrow beams using ion chamber array measurements.

3D dose reconstruction is a verification of the delivered absorbed dose. Our aim was to describe and evaluate a 3D dose reconstruction method applied to phantoms in the context of narrow beams. A solid water phantom and a phantom containing a bone-equivalent material were irradiated on a 6 MV linac. The transmitted dose was measured by using one array of a 2D ion chamber detector. The dose reconstruction was obtained by an iterative algorithm. A phantom set-up error and organ interfraction motion were simulated to test the algorithm sensitivity. In all configurations convergence was obtained within three iterations. A local reconstructed dose agreement of at least 3% / 3mm with respect to the planned dose was obtained, except in a few points of the penumbra. The reconstructed primary fluences were consistent with the planned ones, which validates the whole reconstruction process. The results validate our method in a simple geometry and for narrow beams. The method is sensitive to a set-up error of a heterogeneous phantom and interfraction heterogeneous organ motion.

Phytolith and spherulite studies of herbivores dung from the African Savannah as a tool for palaeocological reconstruction.

Los restos fecales están compuestos mayoritariamente por materia orgánica, la cual se degrada con el tiempo despareciendo finalmente del registro arqueológico. Sin embargo, estos restos fecales también contienen ciertos elementos resistentes al paso del tiempo y a los efectos postdeposicionales. Las esferulitas son cristales de carbonato cálcico formadas en los intestinos de ciertos animales herbívoros, principalmente rumiantes y que posteriormente son depositados en los restos fecales. Los fitolitos de sílice, aunque se forman en las plantas, son también comúnmente identificados en los restos fecales de animales herbívoros. Su número y morfología dependerá de la dieta vegetal de estos animales. El estudio que aquí se presenta se centra en el análisis microscópico de ambos elementos, fitolitos y esferulitas, identificados en restos fecales, de varios animales herbívoros, recolectados durante la estación seca en la Garganta de Olduvai en Tanzania. Los fitolitos y las esferulitas fueron identificados y analizados siguiendo un método morfológico y cuantitativo. Los fitolitos fueron luego comparados con una colección de referencia de plantas modernas de la misma zona geográfica con el propósito de estudiar la dieta de cada uno de los animales analizados. Finalmente los resultados fueron relacionados con los obtenidos del estudio de esferulitas, con el propósito de analizar la relación entre morfología y número de fitolitos y morfología y número de esferulitas para cada uno de los restos fecales analizados. El objetivo de este trabajo consiste en evaluar la utilidad de combinar ambas técnicas para identificar restos fecales en el registro arqueológico y, consecuentemente, responder a cuestiones relacionadas con el animal productor de estos restos, su dieta y movimientos migratorios y, paralelamente, la paleovegetación y el paleopaisaje en una región determinada.

FUTURA: uma base de dados sobre a biblioteca do futuro

Base de dados que objetiva disponibilizar, em único local de fácil e rápido acesso, informações básicas essenciais aos interessados na biblioteca do futuro, seja ela eletrônica, virtual, digital, sem paredes ou biônica. Desenvolvida com o software MicroIsis, encontra-se disponível na Internet a todo e qualquer interessado por intermédio do servidor de bases de dados ISIS para o WWW (software intitulado WWWIsis, desenvolvido pela Bireme). A recuperação da informação é possível por índice de termos indexados ou formulário de pesquisa utilizando-se lógica booleana em campos de autoria, título, assunto, data e língua. Delimitações de pesquisa por tipo de documento e conteúdo de informação também são oferecidas. URL: http://www.eca.usp.br/eca/nucleos/biblial/futura/index.htm

MDCT arthrography of the hip: value of the adaptive statistical iterative reconstruction technique and potential for radiation dose reduction.

OBJECTIVE: The purpose of this article is to assess the effect of the adaptive statistical iterative reconstruction (ASIR) technique on image quality in hip MDCT arthrography and to evaluate its potential for reducing radiation dose. SUBJECTS AND METHODS: Thirty-seven patients examined with hip MDCT arthrography were prospectively randomized into three different protocols: one with a regular dose (volume CT dose index [CTDIvol], 38.4 mGy) and two with a reduced dose (CTDIvol, 24.6 or 15.4 mGy). Images were reconstructed using filtered back projection (FBP) and four increasing percentages of ASIR (30%, 50%, 70%, and 90%). Image noise and contrast-to-noise ratio (CNR) were measured. Two musculoskeletal radiologists independently evaluated several anatomic structures and image quality parameters using a 4-point scale. They also jointly assessed acetabular labrum tears and articular cartilage lesions. RESULTS: With decreasing radiation dose level, image noise statistically significantly increased (p=0.0009) and CNR statistically significantly decreased (p=0.001). We also found a statistically significant reduction in noise (p=0.0001) and increase in CNR (p≤0.003) with increasing percentage of ASIR; in addition, we noted statistically significant increases in image quality scores for the labrum and cartilage, subchondral bone, overall diagnostic quality (up to 50% ASIR), and subjective noise (p≤0.04), and statistically significant reductions for the trabecular bone and muscles (p≤0.03). Regardless of the radiation dose level, there were no statistically significant differences in the detection and characterization of labral tears (n=24; p=1) and cartilage lesions (n=40; p≥0.89) depending on the ASIR percentage. CONCLUSION: The use of up to 50% ASIR in hip MDCT arthrography helps to reduce radiation dose by approximately 35-60%, while maintaining diagnostic image quality comparable to that of a regular-dose protocol using FBP.

A base de dados ISI e seu processo de seleção de revistas

Descreve o processo de seleção de revistas científicas adotado pelo Institute for Scientific Information (ISI) para incorporar publicações em sua base de dados, abordando critérios como periodicidade, conteúdo editorial, internacionalidade e análise de citação.

"El Barranc de Gàfols" (Ginestar, Tarragona) y "Aldovesta" (Benifallet, Tarragona): estudio arqueozoológico como base de teorización sobre la dieta humana a principios de la Edad del Hierro y la complejidad económica en el curso bajo del Ebro.

En relación a trabajos recientes sobre los patrones de poblamiento protohistórico en el curso bajo del Ebro y la causalidad económica (Asensio el alii, 1996/ Mascort el alii, 1991), decidimos plantear un estudio que nutriera dichas hipótesis mediante el análisis arqueozoológico de dos yacimientos culturalmente contemporáneos y de cronologías sucesivas, ubicados a orillas de este río.

Mass movement characterization using a reflexion and refraction seismic survey with the sloping local base level concept

This study proposes a new concept for upscaling local information on failure surfaces derived from geophysical data, in order to develop the spatial information and quickly estimate the magnitude and intensity of a landslide. A new vision of seismic interpretation on landslides is also demonstrated by taking into account basic geomorphic information with a numeric method based on the Sloping Local Base Level (SLBL). The SLBL is a generalization of the base level defined in geomorphology applied to landslides, and allows the calculation of the potential geometry of the landslide failure surface. This approach was applied to a large scale landslide formed mainly in gypsum and situated in a former glacial valley along the Rhone within the Western European Alps. Previous studies identified the existence of two sliding surfaces that may continue below the level of the valley. In this study. seismic refraction-reflexion surveys were carried out to verify the existence of these failure surfaces. The analysis of the seismic data provides a four-layer model where three velocity layers (<1000 ms(-1), 1500 ms(-1) and 3000 ms(-1)) are interpreted as the mobilized mass at different weathering levels and compaction. The highest velocity layer (>4000 ms(-1)) with a maximum depth of similar to 58 m is interpreted as the stable anhydrite bedrock. Two failure surfaces were interpreted from the seismic surveys: an upper failure and a much deeper one (respectively 25 and 50 m deep). The upper failure surface depth deduced from geophysics is slightly different from the results obtained using the SLBL, and the deeper failure surface depth calculated with the SLBL method is underestimated in comparison with the geophysical interpretations. Optimal results were therefore obtained by including the seismic data in the SLBL calculations according to the geomorphic limits of the landslide (maximal volume of mobilized mass = 7.5 x 10(6) m(3)).

Ciência brasileira na base de dados do Institute for Scientific Information (ISI)

Considerando-se a importância da indexação no processo de disseminação da informação na sociedade contemporânea, as bases de dados configuram-se como essenciais nesse processo. Dentre elas, a do Institute for Scientific Information, a mais abrangente base de dados de informações científicas do mundo. Objetiva-se, então, situar a ciência brasileira nessa base, com o perfil dos periódicos ora indexados, a partir de parâmetros como região, estado e município; área de conhecimento; natureza do periódico; avaliação, entre outros. O universo compreende os 17 títulos de periódicos indexados. Para a coleta de dados, recorre-se à análise dos dois últimos fascículos produzidos em 1999. Dentre os resultados, destaca-se a supremacia da região Sudeste.