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Carrières-sous-Poissy, France

Smaoui-Damaka W.,University of Sfax | Guebsia F.,University of Sfax | Karraya S.,University of Sfax | Rebaib T.,Laboratoire dHistologie | And 2 more authors.
Invertebrate Reproduction and Development | Year: 2012

In this study, the variations of glycogen concentrations in Ruditapes decussatus from Sfax coasts (Tunisia) were described in relation to the reproductive cycle. Separate analyses were made of gonad, adductor muscle and 'remainder'. The timing of gametogenic development and spawning was evaluated using qualitative histology associated with image analysis including (1) the estimation of the gonadal occupation index (GOI), (2) surface area occupied by reserve tissues and (3) variation in oocyte diameter. The reproductive cycle of R. decussatus exhibited partial asynchronization between sexes, the major difference being observed in the duration of the spawning period. Contrary to previous studies, we observed continuous partial spawning (e.g. 50% of ripe oocytes still subsisted at the partial spawning stage). During the gametogenic cycle, GOI varied significantly in males and in females. Most oocytes were ripe and ready to spawn when their diameter reached or exceeded 45 mm. The expansion of gonad was inversely proportional to the development of the foot tissue. Glycogen concentration showed significant temporal variations between tissues, indicating the clear differentiation in energy storage between the clam organs. © 2012 Taylor & Francis. Source


Karray S.,University of Sfax | Smaoui-Damak W.,University of Sfax | Rebai T.,Laboratoire dHistologie | Hamza-Chaffai A.,University of Sfax
Environmental Science and Pollution Research | Year: 2015

The gametogenic cycle of the Cerastoderma glaucum was analyzed using both qualitative and semi-quantitative methods. The condition index and glycogen concentrations were determined in order to provide information on energy storage. The cockles were collected monthly from a Bayyadha site located 15 km south of Sfax City (Gulf of Gabès) between January 2007 and January 2008. From histological point of view, we applied two approaches: (i) the qualitative method describing the various stages of gamete development for males and females during a cycle of 13 months, and (ii) the semi-quantitative method concerning the estimation of different tissue surfaces. The results showed that there is evidence of three periods of reproduction in this population. A comparison between the surfaces occupied by the three organs showed that the foot and the gonad surfaces are higher than the surface of the adductor muscle. This could suggest that these two organs are more involved in the process of glycogen reserve storage. The results of the glycogen concentrations in the different tissues (gonad, adductor muscle, and “remainders”) show that during the second and third periods of reproduction, glycogen was stored in the adductor muscle and in the remainder during sexual rest, and in the gonad during the gametogenesis phases in order to supply the reproductive effort. On the contrary, in the first period of reproduction, the low concentrations of glycogen recorded in the gonad coincided with its high degree of development. This fact could be related to environmental conditions (low temperature and food) recorded during this period. © 2015, Springer-Verlag Berlin Heidelberg. Source


Philippi N.,CHU de Strasbourg | Vinzio S.,Service de Medecine Interne et Nutrition | Collongues N.,CHU de Strasbourg | Vix M.,Service de Chirurgie Digestive | And 3 more authors.
Revue Neurologique | Year: 2011

Introduction: Peripheral neuropathies sometimes complicate bariatric surgery. Patients and methods: We report the detailed clinical, electrophysiological, biological and histological characteristics of five patients who developed peripheral neuropathy after bariatric surgery. Results: Three patients presented with small fiber neuropathy, one presented with axonal polyneuropathy, and one with demyelinating polyradiculoneuropathy. All patients had in common prominent neuropathic pain, massive weight loss, and multiple nutritional deficiencies. The pathophysiology of postbariatric surgery polyneuropathies is complex and involves nutritional, infectious and dysimmune mechanisms. Conclusion: The spectrum of peripheral neuropathies complicating bariatric surgery is wide, and includes pure small fiber neuropathy, axonal polyneuropathy, and demyelinating polyradiculoneuropathy. Treatment is mainly preventive, but sometimes surgical revision is needed. © 2011 Elsevier Masson SAS. Tous droits réservés. Source


Conductier G.,French National Center for Scientific Research | Conductier G.,University of Nice Sophia Antipolis | Brau F.,French National Center for Scientific Research | Brau F.,University of Nice Sophia Antipolis | And 29 more authors.
Nature Neuroscience | Year: 2013

Ependymal cell cilia help move cerebrospinal fluid through the cerebral ventricles, but the regulation of their beat frequency remains unclear. Using in vitro, high-speed video microscopy and in vivo magnetic resonance imaging in mice, we found that the metabolic peptide melanin-concentrating hormone (MCH) positively controlled cilia beat frequency, specifically in the ventral third ventricle, whereas a lack of MCH receptor provoked a ventricular size increase. © 2013 Nature America, Inc. All rights reserved. Source


Turki S.,Institute Pasteur Of Tunis | Jabloun Z.,Institute Pasteur Of Tunis | Mrabet G.,Institute Pasteur Of Tunis | Marouani A.,Institute Pasteur Of Tunis | And 6 more authors.
Food and Chemical Toxicology | Year: 2010

Interest in extracellular lipase sourced from the non conventional yeast Yarrowia lipolytica has increased over the last decade. The enzyme was recently suggested as a good candidate for pancreatic exocrine insufficiency treatment. However, there is still a lack of oral safety evaluation data. In this work, we conducted acute and 28-day repeated dose toxicity studies in rats. Both male and female rats were first orally treated with fungal lipase at either single or repeated doses. The results demonstrated that neither single dose nor chronic administration of lipase was associated with mortality or abnormalities in general conditions, behavior and growth. Except a decrease in urine pH and a dose-unrelated increase of triglycerides observed in males, chronic administration of lipase resulted in similar hematological, blood biochemical and urine parameters to those of untreated animals. Minor histopathological changes were observed in lungs and livers of treated and untreated animals but they were considered of no toxicological significance. This study provides, for the first time, safety data on Yarrowia lipolytica extracellular lipase that support its use as a pharmaceutical. © 2010 Elsevier Ltd. Source

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