Effect of nitrogen configuration on carbon nanowall surface: Towards the improvement of electrochemical transduction properties and the stabilization of gold nanoparticles

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A highly selective potentiometric amphetamine microsensor based on all-solid-state membrane using a new ion-pair complex, [3,3′-Co(1,2- closo -C 2 B 9 H 11 ) 2 ] − [C 9 H 13 NH] +

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A novel potentiometric microsensor for real-time detection of Irgarol using the ion-pair complex [Irgarol-H] + [Co(C 2 B 9 H 11 ) 2 ] −

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ETF et TDM dans le diagnostic des hydrocephalies chez l’enfant à Lomé

Purpose: To determine the incidence of hydrocephalus, describe the different aspects ultrasound and CT brain transfontanellar and search for causes of hydrocephalus in children.Material and Methods: It has been a descriptive prospective study of 12 months in radiology departments of Tokoin University Hospital, clinic Autel d’Elie and St. Joseph clinic in Lome. One hundred (101) children were collected with the main indications of macrocephaly and intracranial hypertension.Results: a male predominance with a sex ratio of 1.5. The average age of onset is 19 months. The clinical indication is dominated by the intracranial hypertension and macrocephaly. The tetra ventricles and triventricles hydrocephalus are the most common ultrasound and CT aspects, respectively 43.64% and 41.82%. The hydrocephalus due to infection (56.36%) and malformation (21.82%) were the most observed causes. The post-meningitis hydrocephalus represents 41.82% of post-infectious hydrocephalus. Stenosis of the aqueduct of Sylvius (14.55% of cases) is the most frequently observed malformation.Conclusion: The transfontanellar ultrasound and CT brain contribute to the etiologic diagnosis of hydrocephalus in children remains a disabling condition in our country very few nursing.Keywords: hydrocephalus, transfontanellar ultrasound, computed tomography, child, TogoJ. Rech. Sci. Univ. Lomé (Togo), 2012, Série D, 14(2) : 39-4

A fully integrated passive microfluidic Lab-on-a-Chip for real-time electrochemical detection of ammonium: Sewage applications

International audienceThe present work reports on the development of a new generation of Lab-on-a-chip (LOC) to perform in-situ and real-time potentiometric measurements in flowing water. The device consisted of two differentiated parts: a poly (dimethylsiloxane) (PDMS) microfluidic structure obtained by soft lithography and a fully integrated chemical sensing platform including four working microelectrodes, two reference microelectrodes and one counter microelectrode for detecting ammonium in a continuous mode. The performance of the device was evaluated following its potentiometric response when analyzing ammonium containing samples. As a key parameter, its time of response was compared to that of a commercially available electrical conductivity sensor used as reference sensor during tests in laboratory using flowing tap water and technical scale using flowing wastewater. As a result, the LOC showed a slope of 55 mV/decade, a limit of detection of 4·10−5 M and a time of full response between 10 and 12 s. It was demonstrated that the device can provide fast and reliable data at real time when immersed in a laminar flow of water. Moreover, the test of robustness showed that it was still functional after immersion in sewage for at least 15 min. Besides, the LOC reported here can be helpful for a wide variety of flowing-water applications such as aqua culture outlets control, in-situ and continuous analysis of rivers effluents and sea waters monitoring among others