Carcinome basocellulaire métatypique : a propos de deux cas

Introduction : : Le carcinome métatypique est une entité rare. Il touche essentiellement la région cervico-faciale chez un sujet de sexe masculin. Les auteurs étudieront, à travers deux observations, les caractéristiques cliniques et évolutives du cancer métatypique ainsi que les difficultés thérapeutiques. Observation 1 : Un homme âgé de 41 ans, a présenté un carcinome métatypique temporo-pariétal droit traité initialement par chirurgie. Cinq ans plus tard, il a été réopéré pour une récidive locale et ganglionnaire et a bénéficié ensuite d’une cobaltothérapie, stabilisant ainsi la maladie pendant 4 ans au bout desquels on a noté la survenue d’une deuxième récidive locale avec des métastases pulmonaires. Le malade est décédé, à 10 ans de recul, dans un tableau de pneumopathie diffuse avec septicémie sévère. Observation 2 : Un homme de 71 ans, a présenté un carcinome métatypique de la région rétro- auriculaire. Il a eu une exérèse tumorale avec des limites chirurgicales envahies. Il a présenté plusieurs récidives locales traitées par des exérèses larges jusqu’à une pétrectomie totale. Les limites chirurgicales étaient toujours tumorales. Une radiothérapie postopératoire a été réalisée pour chaque récidive. A 7 ans de recul, il a présenté une récidive locale envahissant l’angleponto-cérébelleux et le cerveau, jugée en dehors de toutes ressources thérapeutiques. Discussion : Le carcinome métatypique est caractérisé par son agressivité et sa tendance à la récidive. Son traitementest essentiellement chirurgical. Une large marge de sécurité lors de l’exérèse est indispensable. La radiothérapie est un traitement adjuvant, devenu incontournable vu le haut risque de récidive. Le rôle de la chimiothérapie n’est pas encore prouvé.

Selection of native Tunisian microalgae for simultaneous wastewater treatment and biofuel production

This paper focuses on the selection of native microalgae strains suitable for wastewater treatment and biofuel production. Four Chlorophyceae strains were isolated from North-eastern Tunisia. Their performances were compared in continuous mode at a 0.3 1/day dilution rate. The biomass productivity and nutrient removal capacity of each microalgae strain were studied. The most efficient strain was identified as Scenedesmus sp. and experiments at different dilution rates from 0.2 to 0.8 1/day were carried out. Maximal biomass productivity of 0.92 g/L·day was obtained at 0.6 1/day. The removal of chemical oxygen demand (COD), ammonium and phosphorus was in the range of 92-94%, 61-99% and 93-99%, respectively. Carbohydrates were the major biomass fraction followed by lipids and then proteins. The saponifiable fatty acid content was in the 4.9-13.2% dry biomass range, with more than 50% of total fatty acids being composed of saturated and monosaturated fatty acids

In search of gravity mode signatures in main sequence solar-type stars observed by Kepler

Gravity modes (g modes), mixed gravito-acoustic modes (mixed modes), and gravito-inertial modes (gi modes) possess unmatched properties as probes for stars with radiative interiors. The structural and dynamical constraints that they are able to provide cannot be accessed by other means. While they provide precious insights into the internal dynamics of evolved stars as well as massive and intermediate-mass stars, their non-detection in main sequence (MS) solar-type stars make them a crucial missing piece in our understanding of angular momentum transport in radiative zones and stellar rotational evolution. In this work, we aim to apply certain analysis tools originally developed for helioseismology in order to look for g-mode signatures in MS solar-type stars. We select a sample of the 34 most promising MS solar-type stars with Kepler four-year long photometric time series. All these stars are well-characterised late F-type stars with thin convective envelopes, fast convective flows, and stochastically excited acoustic modes (p modes). For each star, we compute the background noise level of the Fourier power spectrum to identify significant peaks at low frequency. After successfully detecting individual peaks in 12 targets, we further analyse four of them and observe distinct patterns of surrounding peaks with a low probability of being noise artifacts. Comparisons with the predictions from reference models suggest that these patterns are compatible with the presence of non-asymptotic low-order pure g modes, pure p modes, and mixed modes. Given their sensitivity to both the convective core interface stratification and the coupling between p- and g-mode resonant cavities, such modes are able to provide strong constraints on the structure and evolutionary states of the related targets. [abridged]Comment: 19 pages, 19 figures, accepted for publication in A&

A case of coexisting Warthin tumor and langerhans cell histiocytosis associated with necrosis, eosinophilic abscesses and a granulomatous reaction in intraparotid lymph nodes

We present a patient (50-year-old male) with coexisting Warthin tumor and involvement of two intraparotid lymph nodes by Langerhans cell histiocytosis associated with necrosis, eosinophilic abscesses and a granulomatous reaction. This is the second documented case of this unusual combination of histological changes in nodal Langerhans cell histiocytosis and the first case involving intraparotid lymph nodes occurring together with an ipsilateral Warthin tumor

Throughput assessment of mixed-model flexible transfer lines with unreliable machines

Most of the research that has been carried out to date to analyse transfer line performance is so far limited to the mono-product systems due to the complexity associated with multi-product considerations. In this paper, we consider mixed-model flexible transfer lines manufacturing several product types. The flexible transfer line workstations are arranged in a serial configuration, interconnected by an automatic transfer mechanism, and subject to operation-dependent failures. The throughput is an important tool for measuring the performance of transfer lines, and this paper establishes a method for assessing this throughput. A general simulation model is proposed, allowing a comparison of the performance of the proposed method with those of approximate existing techniques. Numerical computations show that the proposed formulae are robust to estimate the throughput of multi-product transfer lines, and that the results are very satisfactory.Mixed model Transfer lines Throughput Homogenization Operation-dependent failures Simulation modeling

Preparation and characterisation of In2 Se3 thin films

International audienceThe spray pyrolysis conditions required preparing In2Se3 films were optimised. The structural, optical and morphological properties of the films and their evolution are related with the variation of some preparation parameters, which are the substrate temperature and the Se/In molar concentration ratio in the solution

Effet de la température de fabrication sur les propriétés structurales et morphologiques des couches épaisses de In2_2S3_3 “spray"

We have investigated the substrate temperature effect on structural and morphological properties of thick layers deposited on glass substrate by spray method. X-ray diffraction has shown that the In$_2$S$_3$ is the main phase present in these films and that the structure and the allotropic form of this phase are affected by the substrate temperature. Analysis of these layers by Scanning Electronic Microscopy (SEM) and by Atomic Force Microscopy (AFM) revealed that a best crystallinity and homogeneity are approximately obtained for $T_{\rm s} = 613$ K.Nous avons étudié l'effet de la température du substrat sur les propriétés structurales et morphologiques de couches de In$_2$S$_3$ déposées sur des lames de verre par la méthode de spray. La diffraction des rayons X a montré que L'In$_2$S$_3$ est la phase principale présente dans ces films et que la structure et la forme allotropique de cette phase sont affectées par la température du substrat. L'analyse de ces couches par Microscopie Électronique à Balayage (MEB) et par Microscopie à Force Atomique (MFA) a montré qu'une meilleure cristallinité et une meilleure homogénéité sont obtenues pour des températures du substrat voisines de 613 K