Space-time variation of ciliates related to environmental factors in 15 nearshore stations of the Gulf of Gabes

Diversity and structure of ciliate communities in the Gulf of Gabes (Tunisia) were investigated based on a survey of 15 nearshore stations along 237 Km, by monthly sampling over a 1-year. Ciliated protozoa were identified to genus and/or species level and enumerated. Statistic tools were used to explain the ciliates assemblage. High ciliates species richness from 133 taxa was recorded, including new records of 76 species. This study showed a longitudinal distribution of ciliate communities, which are organized in northern stations (from Tabia to Harbor of Gabes) and southern stations (from Zarrat to Jabiat Haj Ali). The number of taxa increased significantly in northern stations but decreased in the southern. This distribution was mainly influenced by the salinity and phytoplankton abundance. Ciliate taxa were grouped into fives size-classes: 15-30 µm, 30-50 µm, 50-100 µm, 100-200 µm and >200 µm. In terms of abundance, most abundant size groups were small ciliates (15-30 μm) accounted from 15 to 79 %, while the greatest biomass contribution came from the 50-100 μm size classes. We thus conclude high diversity of ciliates communities that showed a geographical distribution influenced by abiotic and biotic factors along the coast of Gulf of Gabes

Traitement Chirurgical De L\'hyperparathyroidie Primaire : Techniques Et Resultats

L\'hyperparathyroïdie est secondaire à une sécrétion élevée de parathormone. Le diagnostic positif est biologique et le diagnostic de localisation est radiologique et isotopique. Le traitement chirurgical est la règle. Le but : de ce travail est d\'étudier notre stratégie thérapeutique en cas d\'hyperparathyroïdie primitive et ses résultats. Patients et méthodes : Nous avons mené une étude rétrospective à propos de 34 patients traités pour hyperparathyroïdie primitive durant la période entre 1992 et 2004. Résultats : L\'âge moyen de nos patients était de 51 ans avec une nette prédominance féminine. Notre stratégie chirurgicale était l\'exploration sous anesthésie générale des 4 glandes parathyroïdes. Les glandes pathologiques ont siégé au niveau des compartiments inférieurs dans la majorité des cas. Histologiquement l\'aspect adénomateux a été observé chez 26 patients. L\'examen extemporané était systématique. Son résultat était concordant avec l\'examen anatomopathologique final lui conférant une fiabilité de 100 %. L\'hypocalcémie post-opératoire immédiate a été rencontrée chez 11 patients. Elle était transitoire dans 8 cas. Un seul patient avait une hypercalcémie persistante conférant à notre stratégie chirurgicale un taux de succès de 97,15 %. Discussion : le risque d\'hypocalcémie immédiate varie dans la littérature de 3 à 50%. Dans notre série il était de 32,35%. Ceci est surtout expliqué par notre technique opératoire exposant les parathyroïdes à la dévascularisation. D\'autres techniques chirurgicales moins invasives ont été essayées visant à diminuer le risque d\'hypoparathroidie transitoire ou définitive. Elles sont basées sur un bilan localisateur performant actuellement surplombé par la scintigraphie au sestamibi.Primary hyperparathyroidism is secondary to an elevated secretion of parathormone. The positive diagnosis is biologic. The diagnosis of localization is radiological and isotopic. The surgical treatment is the rule. The aim : of this work is to study our therapeutic strategy in cases of primary hyperparathyroidism and its results. Patients and methods: We proceed to a retrospective study about 34 patients treated for primary hyperparathyroidism during the period between 1992 and 2004. Results: The middle age of our patients was of 51 years with a female predominance. Our surgical strategy was the exploration under general anaesthesia of the 4 parathyroid glands. The pathological glands were in the lower compartments in the majority of cases. Histologically, adenoma has been observed at 26 patients. Extemporary exam was systematic. Its result was in agreement to the final anatomopathological result conferring him a reliability of 100%. The immediate post-operative hypocalcaemia has been observed at 11 patients. It was transient in 8 cases. One alone patient had an obstinate hypercalcaemia conferring to our surgical strategy a rate of success of 97,15%. Discussion: the risk of immediate hypocalcaemia varies in the literature from 3 to 50%. In our study it was 32,35%. It is especially explained by our operative technique exhibitor parathyroïd to the devascularisation. Other operative techniques less invasiveness have been tried aiming to decrease the risk of transient or definitive hypoparathroidy. They are based currently on a effective exam of localization overhung by the scintigraphy to the sestamibi. Journal Tunisien d\'ORL et de chirurgie cervico-faciale Vol. 16 2006: pp. 8-1

Investigation of genetic variability related to the in vitro floral hermaphrodism induction in Date palm (Phoenix dactylifera L.)

This paper reports on a molecular analysis study conducted on Date palm flowers from the Deglet Nour cultivar to investigate putative genetic variability related to the in vitro floral hermaphrodism induction. Natural male and female as well as hermaphrodite ones that were produced in vitro through the hormonal treatment of female flowers were submitted to ISSR-PCR analysis. Microsatellite based amplification (ISSR) was applied on genomic DNA from inflorescences taken at different periods of hormonal treatment corresponding to the various deviation stages to search for putative variations that may have occurred on the initial genome due to the application of plant growth regulators. Several amplification bands were purified, cloned, and sequenced. The results revealed that hormonal treatment entailed no detectable genetic variation in the treated Date palm flowers. Two of the selected and ISSR-PCR amplified DNA fragments showed however, possible links with flowering regulation. The findings indicate that these sequences are potential candidate gene markers that may enhance our understanding of flower development and sex identification in this species.Key words: Date palm, female inflorescences, hermaphrodite flowers, in vitro culture, ISSR, sex identification

Enhanced Graph Rewriting Systems for Complex Software Domain

International audienceMethodologies for correct by construction reconfigurations can efficiently solve consistency issues in dynamic software architecture. Graph-based models are appropriate for designing such architectures and methods. At the same time, they may be unfit to characterize a system from a non functional perspective. This stems from efficiency and applicability limitations in handling time-varying characteristics and their related dependencies. In order to lift these restrictions, an extension to graph rewriting systems is proposed herein. The suitability of this approach, as well as the restraints of currently available ones, are illustrated, analysed and experimentally evaluated with reference to a concrete example. This investigation demonstrates that the conceived solution can: (i) express any kind of algebraic dependencies between evolving requirements and properties; (ii) significantly ameliorate the efficiency and scalability of system modifications with respect to classic methodologies; (iii) provide an efficient access to attribute values; (iv) be fruitfully exploited in software management systems; (v) guarantee theoretical properties of a grammar, like its termination

Total transition probability and spontaneous radiative dissociation of B, C, B′ and D states of molecular hydrogen

The total radiative transition probabilities of rovibronic levels of B, C, B′ and D states of molecular hydrogen are calculated with emphasis on the dissociation fraction and the kinetic energy released in the continuum radiation process. The mixing percentages of B, C, B′ and D adiabatic states are also given. The data are calculated with the detailed transition probabilities obtained by Abgrall et al. (1993, 1994). We have included, in the present analysis, results obtained by using a recent ab initio transition moment for D - X which comprises a larger range of internuclear distances. The related data on individual transition probabilities may be obtained on request.


Microalgae from domestic wastewater facility's high rate algal pond: lipids extraction, characterization and biodiesel production

In this study, the harvesting of a biomass from a high rate algal pond (HRAP) of a real-scale domestic wastewater treatment facility and its potential as a biomaterial for the production of biodiesel were investigated. Increasing the medium pH to 12 induced high flocculation efficiency of up to 96% of the biomass through both sweep flocculation and charge neutralization. Lipids extracted by ultrasounds from this biomass contained around 70% of fatty acids, with palmitic and stearic acids being the most abundant. The extract obtained by supercritical CO2 contained 86% of fatty acids. Both conventional solvents extracts contained only around 10% of unsaturated fats, whereas supercritical CO2 extract contained more than 40% of unsaturated fatty acids. This same biomass was also subject to direct extractive-transesterification in a microwave reactor to produce fatty acid methyl esters, also known as, raw biodiese

SCORM dans l'apprentissage mobile

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SCORM dans l'apprentissage mobile

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Distribution of microplankton in relation to environmental variables during summer stratification in the Gulf of Hammamet, Tunisia

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