Search results for "Biomedical"
showing 10 items of 2328 documents
3D bioprinting of tissue units with mesenchymal stem cells, retaining their proliferative and differentiating potential, in polyphosphate-containing …
2021
Abstract The three-dimensional (3D)-printing processes reach increasing recognition as important fabrication techniques to meet the growing demands in tissue engineering. However, it is imperative to fabricate 3D tissue units, which contain cells that have the property to be regeneratively active. In most bio-inks, a metabolic energy-providing component is missing. Here a formulation of a bio-ink is described, which is enriched with polyphosphate (polyP), a metabolic energy providing physiological polymer. The bio-ink composed of a scaffold (N,O-carboxymethyl chitosan), a hydrogel (alginate) and a cell adhesion matrix (gelatin) as well as polyP substantially increases the viability and the …
Le projet SimAction
2011
Resume Le projet SimAction avait pour but de developper de nouvelles methodes d’aide au reentrainement moteur en exploitant les mecanismes de couplage entre perception et execution de l’action. L’objectif etait de creer des outils d’entrainement par observation complementaires aux methodes conventionnelles basees sur le reentrainement physique. Les outils developpes devaient dans un premier temps etre orientes vers une population âgee. Ce projet a permis un travail en interaction entre des physiologistes du mouvement, des cliniciens, des equipes de recherche specialisees en informatique, traitement de l’image, science cognitive et ergonomie, ainsi que deux industriels. Au cours de ce projet…
Le dossier médical personnel du patient : réflexions sur le portail d’accès unique et le masquage du dossier
2009
Resume Objectifs La loi de financement de la securite sociale du 19 decembre 2007 a precise deux principes fondamentaux du dossier medical personnel qui soulevent de nombreuses questions : le portail unique et le masquage des informations. Materiel et methodes Selon la loi, l’existence d’un portail permet « aux beneficiaires de l’Assurance maladie de gerer leur dossier medical personnel et les droits d’acces des professionnels de sante » et « assure le controle et la tracabilite des acces aux dossiers medicaux personnels ». Il s’agit d’un enjeu majeur tant pour la protection de la vie privee des patients que des promoteurs et des responsables du portail qui pourraient voir leur responsabili…
ANR Inforare : proposition d’un modèle d’identifiant patient individuel pour les patients drépanocytaires
2010
Resume Ce projet a comme objectifs d’organiser le partage d’information et d’evaluer son acceptation par les patients et par les professionnels. La methode repose sur : evaluation de l’acceptabilite du recueil des donnees familiales par les patients ; gestion centralisee de dossiers medicaux rendus anonymes ; proposition d’un modele d’identification du patient et evaluation de la faisabilite du recueil de l’identification et de la qualite du chainage des donnees. Resultats L’entretien semidirectif realise par le LEM a permis d’interroger 43 patients, six membres d’association et six professionnels de sante sur l’acceptabilite du recueil. La plateforme informatique permettant la gestion cent…
Monofunctional pyrenes at carbon nanotube electrodes for direct electron transfer H2O2 reduction with HRP and HRP-bacterial nanocellulose
2021
Abstract The non-covalent modification of carbon nanotube electrodes with pyrene derivatives is a versatile approach to enhance the electrical wiring of enzymes for biosensors and biofuel cells. We report here a comparative study of five pyrene derivatives adsorbed at multi-walled carbon nanotube electrodes to shed light on their ability to promote direct electron transfer with horseradish peroxidase (HRP) for H2O2 reduction. In all cases, pyrene-modified electrodes enhanced catalytic reduction compared to the unmodified electrodes. The pyrene N-hydroxysuccinimide (NHS) ester derivative provided access to the highest catalytic current of 1.4 mA cm−2 at 6 mmol L−1 H2O2, high onset potential …
Electrochemical probe for the monitoring of DNA-protein interactions.
2010
Self-assembly of thiol-terminated oligonucleotides on gold substrates provides a convenient way for DNA-functionalized surfaces. Here we describe the development of an electrochemical assay for the detection of DNA-protein interactions based on the modification of the electrochemical response of methylene blue (MB) intercalated in the DNA strands. Using a functionalized electrode with double stranded DNA carrying T3 RNA polymerase binding sequence, we show a substantial attenuation of the current upon the DNA-protein interaction. Moreover, a Langmuir binding isotherm for T3 RNA polymerase (T3 Pol) gives a dissociation constant K(D) equal to 0.46+/-0.23 microM. Such value is 100 times lower …
Label-free piezoelectric biosensor for prognosis and diagnosis of Systemic Lupus Erythematosus
2017
[EN] An autoantigen piezoelectric sensor to quantify specific circulating autoantibodies in human serum is developed. The sensor consisted on a quartz crystal microbalance with dissipation monitoring (QCM-D) where TRIM21 and TROVE2 autoantigens were covalently immobilized, allowing the selective determination of autoantibodies for diagnosis and prognosis of Systemic Lupus Erythematosus (SLE). The sensitivity of the biosensor, measured as IC50 value, was 1.51 U/mL and 0.32 U/mL, for anti-TRIM21 and anti-TROVE2 circulating autoantibodies, respectively. The sensor is also able to establish a structural interaction fingerprint pattern or profile of circulating autoantibodies, what allows scorin…
Assessment of Granger causality by nonlinear model identification: application to short-term cardiovascular variability.
2007
A method for assessing Granger causal relationships in bivariate time series, based on nonlinear autoregressive (NAR) and nonlinear autoregressive exogenous (NARX) models is presented. The method evaluates bilateral interactions between two time series by quantifying the predictability improvement (PI) of the output time series when the dynamics associated with the input time series are included, i.e., moving from NAR to NARX prediction. The NARX model identification was performed by the optimal parameter search (OPS) algorithm, and its results were compared to the least-squares method to determine the most appropriate method to be used for experimental data. The statistical significance of…
Mutual nonlinear prediction of cardiovascular variability series: Comparison between exogenous and autoregressive exogenous models
2007
A model-based approach to perform mutual nonlinear prediction of short cardiovascular variability series is presented. The approach is based on identifying exogenous (X) and autoregressive exogenous (ARX) models by K-nearest neighbors local linear approximation, and estimates the predictability of a series given the other as the squared correlation between original and predicted values of the series. The method was first tested on simulations reproducing different types of interaction between non-identical Henon maps, and then applied to heart rate (HR) and blood pressure (BP) variability series measured in healthy subjects at rest and after head-up tilt. Simulations showed that different c…
Spin qubits with electrically gated polyoxometalate molecules
2007
Spin qubits offer one of the most promising routes to the implementation of quantum computers. Very recent results in semiconductor quantum dots show that electrically-controlled gating schemes are particularly well-suited for the realization of a universal set of quantum logical gates. Scalability to a larger number of qubits, however, remains an issue for such semiconductor quantum dots. In contrast, a chemical bottom-up approach allows one to produce identical units in which localized spins represent the qubits. Molecular magnetism has produced a wide range of systems with tailored properties, but molecules permitting electrical gating have been lacking. Here we propose to use the polyox…