5 research outputs found

    BIOTEX-biosensing textiles for personalised healthcare management.

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    Textile-based sensors offer an unobtrusive method of continually monitoring physiological parameters during daily activities. Chemical analysis of body fluids, noninvasively, is a novel and exciting area of personalized wearable healthcare systems. BIOTEX was an EU-funded project that aimed to develop textile sensors to measure physiological parameters and the chemical composition of body fluids, with a particular interest in sweat. A wearable sensing system has been developed that integrates a textile-based fluid handling system for sample collection and transport with a number of sensors including sodium, conductivity, and pH sensors. Sensors for sweat rate, ECG, respiration, and blood oxygenation were also developed. For the first time, it has been possible to monitor a number of physiological parameters together with sweat composition in real time. This has been carried out via a network of wearable sensors distributed around the body of a subject user. This has huge implications for the field of sports and human performance and opens a whole new field of research in the clinical setting

    Oxydation énantiosélective de sulfures, par l'eau oxygénée catalysée par des complexes de fer (+II), de fer (+III) ou de manganÚse (+II), et par des N-alkyloxaziridines activables par des acides Lewis

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    Le travail de cette thÚse a concerné la mise au point de nouveaux outils pour la catalyse d'oxydation énantiosélective de sulfures. Dans un premier temps, nous avons réalisé une étude de métallocomplexes de Fe (+II), (+III) ou de Mn (+II) en catalyse d'oxydation d'alkylarylsulfures par H2O2. Pour cela, des ligands chiraux de symétrie C2 possédant une sphÚre de coordination tétraazotée linéaire ont été choisis et les complexes obtenus ont été caractérisés par différentes techniques. Ces complexes ont ensuite prouvé leur efficacité en catalyse d'oxydation d'alkylarylsulfures par H2O2 et de bons excÚs énantiométriques allant jusqu'à 62% ont été obtenus. Par ailleurs, nous avons mis en évidence un trÚs intéressant " commutateur de configuration " par échange d'anions sur l'ion métallique. En effet, tandis que dans un cas le sulfoxyde obtenu lors de la réaction catalysée est de configuration absolue S, l'échange d'anion conduit au sulfoxyde de configuration R. Nous avons également réalisé au cours de ce travail de thÚse, pour la premiÚre fois l'oxydation quasi quantitative et chimiosélective d'alkylarylsulfures en quelques minutes par des N-alkyloxaziridines en présence d'acides de Lewis autre que le proton. Nous avons démontré que cette activation était possible par une coordination bidente de l'acide de Lewis par l'oxaziridine. De nouvelles N-énantiomériques variant entre 31 et 65% ont été obtenus. De plus, ces oxaziridines conduisent quantitativement aux imines correspondantes. Actuellement nous travaillons à rendre ce systÚme catalytique.GRENOBLE1-BU Sciences (384212103) / SudocSudocFranceF

    Explaining fat sensitivity in cottage cheeses by aroma re-lease and oral physiology parameters

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    Great inter-individual differences exist in fat perception. Forty subjects were grouped according their global fat perception in cottage cheeses. The more sensitive subjects were also more sensitive to fatty odorants, they had a higher respiratory flow and thus a higher rate of release of aroma compounds in the nasal cavity, which could explain the role of the olfactory modality in fat perception. Fat sensitive subjects had a lower saliva flow, less viscous saliva, and less amount of product remaining in the mouth after swallowing, which could explain, why they were more sensitive to taste and textural modalities of fat perception

    Explaining fat sensitivity in cottage cheeses by aroma release and oral physiology parameters

    No full text
    International audienceGreat inter-individual differences exist in fat perception. Forty subjects were grouped according their global fat perception in cottage cheeses. The more sensitive subjects were also more sensitive to fatty odorants, they had a higher respiratory flow andthus a higher rate of release of aroma compounds in the nasal cavity, which could explain the role of the olfactory modality in fat perception. Fat sensitive subjects had a lower saliva flow, less viscous saliva, and less amount of product remaining in the mouth after swallowing, which could explain, why they were more sensitive to taste and textural modalities of fat perception
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