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We report on the deswelling behavior of microcomposite hydrogel films composed of poly(N-isopropylacrylamide) (pNIPAm). These films were synthesized first by formation of pNIPAm microgel particles via precipitation polymerization, followed by polymerization of these particles into a pNIPAm thin film gel matrix immobilized on a glass slide. The deswelling behavior of these composite films was studied by temperature-dependent light scattering (i.e., turbidity). In conventional (not microstructured) films the scattering increases and plateaus as the temperature is increased beyond the lower critical solution temperature (LCST) of pNIPAm. In contrast to these conventional films, microgel composite films display an increase in turbidity until the LCST, followed by a rapid turbidity decrease beyond the LCST. It is also observed that the rate at which scattering decreases depends on the concentration of the hydrogel particles in the film. Together, these results offer insight into the morphological changes occurring during the deswelling processes in composite hydrogel thin films.

Offers suggestions for disabled person, particularly the blind to move about the kitchen and learn how to cook. Adapting sound technique; Familiarization with equipment and ingredients; Courage to mess around and mess up the kitchen; Taking risks; Cleaning up.

En raison d’un manque croissant de greffons rénaux, les critères pour le don de rein ont été élargis. Depuis 2002, on définit des donneurs à critères élargis (DCE) [1] : âge supérieur à 60ans, ou entre 50 et 59ans avec 2 comorbidités (hypertension artérielle, antécédents cardiovasculaires, créatininémie supérieure à 130μmol/L). Le pronostic fonctionnel de ces greffons marginaux est moins bon [1], et justifie parfois la double greffe rénale. L’objectif de cette étude était d’étudier la fonction rénale des greffons prélevés chez des donneurs très âgés, sachant que cette sous-population de donneurs représente 21 % de l’ensemble des donneurs (données nationales 2014 de l’agence de biomédecine).