Ohmic heating applied to the baking process: experimental and numerical approaches

International audienceThis work aims at studying the feasibility of ohmic heating (OH) technology applied to the baking process. The method includes proofing (fermentation) and baking and leads to the production of crustless sandwich bread without the need of cutting the crust away, in a shorter time and with theoretically lower energy costs than conventional baking. An ohmic cell was made to study the electrical conductivity (EC) of bread dough under different experimental conditions. The results showed that the EC increased linearly with the temperature, except during the starch gelatinization stage (60 – 76 °C) because of the bounding of water. The EC decreased with the porosity of the dough when fermented by yeasts, and drastically decreased with the reduction of salt content in the dough, showing the need to control the product formulation. An ohmic baking oven monitored by a PLC was developed to perform both proofing and baking in the same apparatus. The results showed that using OH to quickly reach the optimal temperature of yeast activity (35 °C) significantly reduced the lag phase and shortened the total proofing time. A numerical model was developed and validated by experimental results, taking into account heat and water (vapour and liquid water) transfers. The results confirmed the importance of temperature gradients between the surface of the electrodes and the core of the product, first observed by the underbaked aspect of the bread loaf on its sides. Different baking scenarios and their impacts on temperature and water content gradients were modelled

Congélation de produits alimentaires : amélioration de la cristallisation par applications de micro-ondes

National audienceLa qualité d'un produit congelé est liée à la cristallisation ; en règle générale, plus la taille des cristaux de glace est petite, meilleure sera la qualité du produit. Un procédé innovant a été évalué dans le cadre du projet européen (FREEZEWAVE). Une assistance micro-ondes (2450 MHz) a été utilisée pour perturber le changement d'état de l'eau. Sur un prototype de laboratoire, les expériences ont confirmé que, quels que soient le mode d'application des micro-ondes et les paramètres du procédé, on observe une réduction de la taille des cristaux. Cet impact positif a été obtenu sur diverses matrices alimentaires, dont des pommes de terre. Un modèle de prédiction a par ailleurs permis de qualifier ces cinétiques. Deux concepts sont avancés pour expliquer ces effets bénéfiques. Abstract FREEZEWAVE project (SUSFOOD ERA-net project 2015-2018

Alzheimers Dement

Introduction: The free and cued selective reminding test is used to identify memory deficits in mild cognitive impairment and demented patients. It allows assessing three processes: encoding, storage, and recollection of verbal episodic memory. Methods: We investigated the neural correlates of these three memory processes in a large cohort study. The Memento cohort enrolled 2323 outpatients presenting either with subjective cognitive decline or mild cognitive impairment who underwent cognitive, structural MRI and, for a subset, fluorodeoxyglucose-positron emission tomography evaluations. Results: Encoding was associated with a network including parietal and temporal cortices; storage was mainly associated with entorhinal and parahippocampal regions, bilaterally; retrieval was associated with a widespread network encompassing frontal regions. Discussion: The neural correlates of episodic memory processes can be assessed in large and standardized cohorts of patients at risk for Alzheimer's disease. Their relation to pathophysiological markers of Alzheimer's disease remains to be studied

Biomarker counseling, disclosure of diagnosis and follow-up in patients with mild cognitive impairment:A European Alzheimer's Disease Consortium survey

Objectives: Mild cognitive impairment (MCI) is associated with an increased risk of further cognitive decline, partly depending on demographics and biomarker status. The aim of the present study was to survey the clinical practices of physicians in terms of biomarker counseling, management, and follow-up in European expert centers diagnosing patients with MCI. Methods: An online email survey was distributed to physicians affiliated with European Alzheimer's disease Consortium centers (Northern Europe: 10 centers; Eastern and Central Europe: 9 centers; and Southern Europe: 15 centers) with questions on attitudes toward biomarkers and biomarker counseling in MCI and dementia. This included postbiomarker counseling and the process of diagnostic disclosure of MCI, as well as treatment and follow-up in MCI. Results: The response rate for the survey was 80.9% (34 of 42 centers) across 20 countries. A large majority of physicians had access to biomarkers and found them useful. Pre- and postbiomarker counseling varied across centers, as did practices for referral to support groups and advice on preventive strategies. Less than half reported discussing driving and advance care planning with patients with MCI. Conclusions: The variability in clinical practices across centers calls for better biomarker counseling and better training to improve communication skills. Future initiatives should address the importance of communicating preventive strategies and advance planning

Intensification des transferts en agroalimentaire : approches numériques et expérimentales

Intensification des transferts en agroalimentaire : approches numérique et expérimentale Synthèse des travaux de recherche En vue d'obtenir le diplôme d'Habilitation à diriger des Recherche

Numerical investigation on the efficiency of transient contaminant removal from a food processing clean room using ventilation effectiveness concepts

International audienc

Evolution de l'aphasie après thrombolyse intra-veineuse à la phase aiguë des infarctus cérébraux

DIJON-BU Médecine Pharmacie (212312103) / SudocSudocFranceF

Modalités de prise en charge médicamenteuse des patients atteints de la maladie d'Alzheimer vus au centre mémoire ressource et recherche du C.H.U. de Dijon entre le 1 janvier 2009 et le 30 juin 2009

DIJON-BU Médecine Pharmacie (212312103) / SudocSudocFranceF

Intérêts diagnostiques de l'analyse sémiologique des manifestations psychotiques dans la maladie de Parkinson et la démence à corps de Lewy (à partir d'une revue de la littérature)

DIJON-BU Médecine Pharmacie (212312103) / SudocPARIS-BIUM (751062103) / SudocSudocFranceF

Apport des biomarqueurs du liquide céphalo rachidien pour le diagnostic de maladie d'Alzheimer (à partir de l'expérience du CCMR de Dijon et du CM de Chalon sur Saône entre 2009 et 2010)

Résumé françaisDIJON-BU Médecine Pharmacie (212312103) / SudocSudocFranceF