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1. An electroencephalography connectome predictive model of major depressive disorder severity

Author

Kabbara, Aya, Robert, Gabriel, Khalil, Mohamad, Verin, Marc, Benquet, Pascal, Hassan, Mahmoud, Lebanese Association for Scientific Research [Tripoli] (LASeR), MINDig, Centre Hospitalier Guillaume Régnier [Rennes], Institut de Recherche en Informatique et Systèmes Aléatoires (IRISA), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Université de Bretagne Sud (UBS)-École normale supérieure - Rennes (ENS Rennes)-Institut National de Recherche en Informatique et en Automatique (Inria)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Comportement et noyaux gris centraux - EA 4712, Université de Rennes (UR)-Institut des Neurosciences Cliniques de Rennes (INCR), emlyon business school (EM), Lebanese University [Beirut] (LU), Ecole Doctorale des Sciences et de la Technologie (EDST), Azm Center for research in biotechnology and its applications [TRIPOLI], Université Libanaise, CHU Pontchaillou [Rennes], Laboratoire Traitement du Signal et de l'Image (LTSI), Université de Rennes (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM), Reykjavík University, robert, gabriel, Comportement et noyaux gris centraux = Behavior and Basal Ganglia [Rennes], Université de Rennes (UR)-Université européenne de Bretagne - European University of Brittany (UEB)-CHU Pontchaillou [Rennes]-Institut des Neurosciences Cliniques de Rennes (INCR), This work was financed by the Rennes University, the Institute of Clinical Neuroscience of Rennes (Projects named EEGCog and EEGNET3). This work was also financed by the AZM and SAADE Association, Tripoli, Lebanon and by the National Council for Scientific Research (CNRS) in Lebanon. Authors would like to thank Campus France, Programme Hubert Curien CEDRE (PROJET N° 42257YA) and the Lebanese Association for Scientific Research (LASER) for their support, HAL UR1, Admin, Université de Rennes (UR)-Institut des Neurosciences Cliniques de Rennes = Institute of Clinical Neurosciences of Rennes (INCR), and Université de Rennes (UR)-Université européenne de Bretagne - European University of Brittany (UEB)-CHU Pontchaillou [Rennes]-Institut des Neurosciences Cliniques de Rennes = Institute of Clinical Neurosciences of Rennes (INCR)

Subjects
[SDV.IB] Life Sciences [q-bio]/Bioengineering, Depressive Disorder, Major, Multidisciplinary, [SDV.NEU.PC]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Psychology and behavior, [SDV]Life Sciences [q-bio], [SDV.MHEP.PSM] Life Sciences [q-bio]/Human health and pathology/Psychiatrics and mental health, [SDV.NEU.PC] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Psychology and behavior, Brain, Electroencephalography, [STAT] Statistics [stat], Machine Learning, [STAT]Statistics [stat], [SDV] Life Sciences [q-bio], FOS: Biological sciences, Quantitative Biology - Neurons and Cognition, [SDV.MHEP.PSM]Life Sciences [q-bio]/Human health and pathology/Psychiatrics and mental health, Connectome, Humans, Neurons and Cognition (q-bio.NC), [SDV.IB]Life Sciences [q-bio]/Bioengineering, [SPI.SIGNAL]Engineering Sciences [physics]/Signal and Image processing, [SPI.SIGNAL] Engineering Sciences [physics]/Signal and Image processing
Abstract

Emerging evidence showed that major depressive disorder (MDD) is associated with disruptions of brain structural and functional networks, rather than impairment of isolated brain region. Thus, connectome-based models capable of predicting the depression severity at the individual level can be clinically useful. Here, we applied a machine-learning approach to predict the severity of depression using resting-state networks derived from source-reconstructed Electroencephalography (EEG) signals. Using regression models and three independent EEG datasets (N = 328), we tested whether resting state functional connectivity could predict individual depression score. On the first dataset, results showed that individuals scores could be reasonably predicted (r = 0.6, p = 4 × 10–18) using intrinsic functional connectivity in the EEG alpha band (8–13 Hz). In particular, the brain regions which contributed the most to the predictive network belong to the default mode network. We further tested the predictive potential of the established model by conducting two external validations on (N1 = 53, N2 = 154). Results showed statistically significant correlations between the predicted and the measured depression scale scores (r1 = 0.52, r2 = 0.44, p

Published
2022
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2. On the origin of epileptic High Frequency Oscillations observed on clinical electrodes

Author

Fabrice Wendling, Wassim El Falou, Mohamad Khalil, Anca Nica, Mohamad Shamas, Isabelle Merlet, Pascal Benquet, Laboratoire Traitement du Signal et de l'Image (LTSI), Université de Rennes (UR)-Institut National de la Santé et de la Recherche Médicale (INSERM), Lebanese University [Beirut] (LU), French ANR and GDOS, AZM and SAADE Association (Tripoli, Lebanon), ANR-13-PRTS-0011,VIBRATIONS,Interprétation des signaux électrophysiologiques en épilepsie basée sur un cerveau virtuel(2013), Université de Rennes 1 (UR1), and Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
0301 basic medicine, Drug Resistant Epilepsy, Depolarizing GABA, High frequency oscillations, Neurotransmission, 03 medical and health sciences, 0302 clinical medicine, Physiology (medical), [SDV.MHEP.PHY]Life Sciences [q-bio]/Human health and pathology/Tissues and Organs [q-bio.TO], Humans, 3d geometry, Cerebral Cortex, Physics, Brain Mapping, Oscillation, Generation mechanisms, Depth-EEG, Electroencephalography, Depolarization, Synaptic Potentials, Neurophysiology, Sensory Systems, Electrodes, Implanted, Out of phase, 030104 developmental biology, Neurology, [PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], GABAergic, [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], Neurology (clinical), Spatial extent, Neuroscience, Neuronal population model, 030217 neurology & neurosurgery
Abstract

Objective In this study we aim to identify the key (patho)physiological mechanisms and biophysical factors which impact the observability and spectral features of High Frequency Oscillations (HFOs). Methods In order to accurately replicate HFOs we developed virtual-brain/virtual-electrode simulation environment combining novel neurophysiological models of neuronal populations with biophysical models for the source/sensor relationship. Both (patho)physiological mechanisms (synaptic transmission, depolarizing GABAA effect, hyperexcitability) and physical factors (geometry of extended cortical sources, size and position of electrodes) were taken into account. Simulated HFOs were compared to real HFOs extracted from intracerebral recordings of 2 patients. Results Our results revealed that HFO pathological activity is being generated by feed-forward activation of cortical interneurons that produce fast depolarizing GABAergic post-synaptic potentials (PSPs) onto pyramidal cells. Out of phase patterns of depolarizing GABAergic PSPs explained the shape, entropy and spatiotemporal features of real human HFOs. Conclusions The terminology “high-frequency oscillation” (HFO) might be misleading as the fast ripple component (200–600 Hz) is more likely a “high-frequency activity” (HFA), the origin of which is independent from any oscillatory process. Significance New insights regarding the origins and observability of HFOs along depth-EEG electrodes were gained in terms of spatial extent and 3D geometry of neuronal sources.

Published
2018
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3. Filterability of exopolysaccharides solutions from the red microalga Porphyridium cruentum by tangential filtration on a polymeric membrane

Author

Patrick Bourseau, Benoit Teychene, Murielle Rabiller-Baudry, Lisa Zaouk, Pascal Jaouen, Sébastien Jubeau, Anthony Massé, Samir Taha, Jeremy Pruvost, Laboratoire de génie des procédés - environnement - agroalimentaire (GEPEA), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Centre National de la Recherche Scientifique (CNRS)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie - Nantes (IUT Nantes), Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire), Université de Nantes (UN)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL), Institut de Recherche Dupuy de Lôme (IRDL), Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), Université Libanaise, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Algosource Technologies, Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), Université de Poitiers-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Bioprocédés Appliqués aux Microalgues (GEPEA-BAM), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Agence de l'Environnement et de la Maîtrise de l'Energie, Azm and Saade Association, Institut Universitaire de Technologie - Nantes (IUT Nantes), Université de Nantes (UN)-Université de Nantes (UN)-Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut Universitaire de Technologie Saint-Nazaire (IUT Saint-Nazaire), Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-École nationale vétérinaire, agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Universitaire de Technologie - La Roche-sur-Yon (IUT La Roche-sur-Yon), Université de Nantes (UN), École Nationale d'Ingénieurs de Brest (ENIB)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Institut Universitaire de Technologie - Nantes (IUT Nantes), Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Brest (UBO)-Université de Bretagne Sud (UBS), Centre Azm pour la Recherche en Biotechnologie et ses Applications (EDST), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS), Université de Poitiers-Centre National de la Recherche Scientifique (CNRS), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Rennes-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Université de Nantes (UN)-Ecole Nationale Vétérinaire, Agroalimentaire et de l'alimentation Nantes-Atlantique (ONIRIS)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique)

Subjects
fouling, 0208 environmental biotechnology, Ultrafiltration, Porphyridium cruentum, 02 engineering and technology, 010501 environmental sciences, 01 natural sciences, law.invention, [CHIM.GENI]Chemical Sciences/Chemical engineering, law, exopolysaccharides (EPS), Environmental Chemistry, Waste Management and Disposal, Filtration, 0105 earth and related environmental sciences, Water Science and Technology, Chromatography, Fouling, biology, Chemistry, PES 50 kDa MWCO membrane, General Medicine, biology.organism_classification, 6. Clean water, 020801 environmental engineering, 13. Climate action, ultrafiltration, Polymeric membrane
Abstract

International audience; The red microalga Porphyridium cruentum is exploited industrially for its exopolysaccharides (EPS) and pigments production. EPS produced by P. cruentum are partially released and dissolved into the surrounding environment, they can be recovered from the culture medium after removing the cells. This paper presents a parametric study of the ultrafiltration of EPS solutions on organic membrane. The EPS solutions were produced in conditions representative of an industrial production. They were filtered at lab-scale on a flat, PES 50 kDa MWCO membrane in a complete recirculation mode of permeate and retentate. Permeate flux-transmembrane pressure (TMP) curves were established up to the limiting flux for the filtration of solutions with various values of concentration in EPS (0.10 to 1.06 kg GlcEq.m), fluid tangential velocity (0.3 to 1.2 m.s) and temperature (20 and 40 °C). The reversible and irreversible parts of fouling were evaluated for each experiment and the critical flux was determined for an intermediate EPS concentration (0.16 kg GlcEq.m). The results showed that EPS solutions had a strong fouling capacity. When filtering the lowest concentrated solution (0.10 kg GlcEq.m) with moderate fouling conditions, the overall fouling resistance was approximately half of the membrane and the share of irreversible/reversible fouling was 88 and 12%. However, the part of reversible fouling becomes predominant when approaching the limiting flux. Permeate fluxes which were obtained allow to estimate that a VRR of approximately 10 could be obtained when concentrating EPS solutions using PES membranes in flat or tubular modules but not in spiral-wound.

Published
2020
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4. Luminescence amplification at BiVO4 photoanodes by photoinduced electrochemiluminescence

Author

Gabriel Loget, Rawa Abdallah, Hiba Saada, Neso Sojic, Jing Yu, Institut des Sciences Moléculaires (ISM), Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Synthèse Caractérisation Analyse de la Matière (ScanMAT), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut de Chimie du CNRS (INC), Lebanese University [Beirut] (LU), China Scholarship Council, Azm and Saade Association, Université Montesquieu - Bordeaux 4-Université Sciences et Technologies - Bordeaux 1 (UB)-École Nationale Supérieure de Chimie et de Physique de Bordeaux (ENSCPB)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, bismuth vanadate, Band gap, Photoelectrochemistry, 010402 general chemistry, 7. Clean energy, 01 natural sciences, Catalysis, Luminol, photoelectrochemistry, chemistry.chemical_compound, electrochemiluminescence, luminol, Electrochemiluminescence, [CHIM]Chemical Sciences, 010405 organic chemistry, business.industry, General Chemistry, General Medicine, Fluorescence, 0104 chemical sciences, Semiconductor, chemistry, Bismuth vanadate, Optoelectronics, business, Luminescence, enhanced luminescence
Abstract

International audience; Photoinduced electrochemiluminescence (PECL) combines semiconductor (SC) photoelectrochemistry with electrochemiluminescence (ECL). In PECL, the incident light is converted to a different wavelength by an electrochemical reaction at a SC photoelectrode and allows to trigger ECL at unprecedented low potentials. This concept has been employed so far to design up-conversion systems using Si or III-V SCs. Nevertheless, PECL strongly suffers from the photoelectrochemical instability of these low bandgap SCs. Here, we report for the first time an original light conversion strategy based on PECL of a luminol derivative (L-012) at BiVO 4 photoanodes in water. An incident light photo-excites simultaneously the L-012 fluorescence and the photoanode. However, the resulting fluorescence signal is surpassed by the PECL emission. In addition, we show that, with this system, PECL can be induced at a potential as low as -0.4 V for several hours and that it can be employed to finely tune L-012 luminescence. This remarkable light enhancement and the record low applied potential are promising for the design of new analytical strategies and light-addressable systems.

Published
2020
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5. Sleep habits and sleep characteristics at age 1 year in the ELFE birth cohort study

Author

Messayke, Sabine, Franco, Patricia, Forhan, Anne, Dufourg, Marie-Noëlle, Charles, Marie-Aline, Plancoulaine, Sabine, Centre de Recherche Épidémiologie et Statistique Sorbonne Paris Cité (CRESS (U1153 / UMR_A_1125 / UMR_S_1153)), Université Paris Diderot - Paris 7 (UPD7)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de la Recherche Agronomique (INRA)-Université Paris Descartes - Paris 5 (UPD5)-Université Sorbonne Paris Cité (USPC), Centre de recherche en neurosciences de Lyon (CRNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Etude longitudinale française depuis l'enfance (UMS : Ined-Inserm-EFS) (ELFE), EFS-Institut national d'études démographiques (INED)-Institut National de la Santé et de la Recherche Médicale (INSERM), Conservatoire National des Arts et Métiers [CNAM] (CNAM)-Université Sorbonne Paris Cité (USPC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Paris (UP)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut national d'études démographiques (INED)-EFS-Institut National de la Santé et de la Recherche Médicale (INSERM), Azm and Saade Association, Institut National de la Recherche Agronomique (INRA)-Université Paris Diderot - Paris 7 (UPD7)-Université Paris Descartes - Paris 5 (UPD5)-Université Sorbonne Paris Cité (USPC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Centre de recherche en neurosciences de Lyon - Lyon Neuroscience Research Center (CRNL), Université de Lyon-Université de Lyon-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and Plancoulaine, Sabine

Subjects
[SDV.AEN] Life Sciences [q-bio]/Food and Nutrition, Night waking, Sleep duration, [SDV.SPEE] Life Sciences [q-bio]/Santé publique et épidémiologie, Epidemiology, Infant, [SDV.NEU]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie, [SDV.NEU] Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC], [SDV.AEN]Life Sciences [q-bio]/Food and Nutrition, Birth-cohort, Sleep onset difficulty
Abstract

International audience; Infant sleep plays a critical role in normal development. Sleep problems, including sleep onset difficulties (SODs) and night waking (NW), range from 20% to 30% in infants and young children and can be persistent over time up to adulthood. Young French children seem to have longer sleep durations and less sleep troubles than their counterparts worldwide. Here, we aimed at describing infant sleep characteristics (total sleep time (TST)/24 h, NW, and SODs) and associated sleep habits in infants at age one year from the French nationwide birth cohort Etude Longitudinale Française depuis l'Enfance (ELFE).METHODS:This study included 11,783 infants with information on both sleep characteristics and sleep habits (parental presence when falling asleep, eating to fall asleep, sucking a pacifier or finger to sleep and sleep arrangement and location). Associations were studied by multinomial logistic regression analyses adjusted for familial and infant characteristics.RESULTS:Mean TST was 13 h36 min including 2 h54 min of naps; 20% of the infants had TST ≤12 h/24 h. About 46% did not present SOD or NW, 16% had frequent SODs and 22% had NW > 1 night in 2. Parental presence, feeding to fall asleep and infant sleep arrangements were frequent in infants with short sleep duration (≤12 h/24 h), NW and SODs. Non-nutritive sucking was associated with risk of NW, SOD and TST >14 h/24 h. Parental room sharing was associated with NW.CONCLUSION:This work provides new information on infant sleep arrangements and non-nutritive sucking that should be accounted for when considering sleep behaviors. In addition, most identified sleep habits associated with poor sleep characteristics may be amenable to change.

Published
2019
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6. Extracted ulvans from green algae Ulva linza of Lebanese origin and amphiphilic derivatives evaluation of their physico-chemical and rheological properties

Author

Thierry Benvegnu, Jelena Jeftic, Jean-Paul Guégan, Hiba Mawlawi, Samir Taha, Nouha Sari-Chmayssem, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université Libanaise, AZM and SAADE association, doctoral school for sciences and technology-Lebanese university, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0106 biological sciences, Ulva linza, Rhamnose, Size-exclusion chromatography, Iduronic acid, 02 engineering and technology, Plant Science, Uronic acid, Aquatic Science, Xylose, Polysaccharide, 01 natural sciences, chemistry.chemical_compound, NMR spectroscopy, Chlorophyta, [CHIM]Chemical Sciences, Hydrophobically modified uronamide ulvan, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Surfactant properties, biology, 010604 marine biology & hydrobiology, Rheological behavior, 021001 nanoscience & nanotechnology, biology.organism_classification, Glucuronic acid, Ulvan, 6. Clean water, chemistry, 0210 nano-technology, Nuclear chemistry
Abstract

Over the last years, different seaweeds have raised considerable interest as sources of valuable and biodegradable materials from renewable and environmental sources in order to limit the use of the traditional non-renewable petroleum/chemical-based ones. For instance, the exploitation of algae as a source of carbohydrate polymers has been the target of special attention and specifically research on the unexploited green algae, including their polysaccharide ulvan. In this study, a simple method for extraction of ulvan from the green alga Ulva linza of Lebanese origin is demonstrated successfully without enzymatic treatment. The isolated ulvan (yield = 21.7%) was characterized in terms of composition and structure by elemental analysis, turbidimetric method of barium sulfate, size exclusion chromatography, HPLC after acidic methanolysis of ulvan, FTIR, and NMR spectroscopy. An ulvan with a relatively low content of protein (2.56%), high amount of sulfate (17.2%), and a molecular weight of 565,100 g mol−1 was identified as a sole polysaccharide. This ulvan was rich in rhamnose (26.2%) and glucuronic acid (11.5%) while a low amount of iduronic acid (3.5%), xylose (5.8%), and glucose (1.2%) was detected. Rheological properties of ulvan revealed a shear-thinning pseudoplastic behavior for a concentration range between 0.5 and 3% in a solution of 7 mM CaCl2 and 7 mM H3BO3. Also, storage (G′) and loss (G″) moduli were studied for ulvan solution (1%). Besides, an original hydrophobically modified uronamide ulvan (HM-ulvan) was elaborated in aqueous medium using the coupling agent EDC-HCl in the presence of octylamine. The linkage between carboxylic groups of ulvan uronic acid and octylamine via amide functions was demonstrated chemically by FTIR and NMR (1D and 2D). In conclusion, the introduction of octyl fatty chains on the ulvan backbone increased the dynamic viscosity and improved the rheological properties by creating hydrophobic associations in the solution of HM-ulvan. The low degree of substitution (0.42) influenced dramatically the critical aggregation concentration (CAC) and no foam properties of HM-ulvan were detected.

Published
2019
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7. A combination of transformation optics and surface impedance modulation to design compact retrodirective reflectors

Author

Raphaël Gillard, Ali Harmouch, Hassan Haddad, Renaud Loison, Akil Jrad, Institut d'Électronique et des Technologies du numéRique (IETR), Université de Nantes (UN)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Ecole Doctorale des Sciences et de la Technologie (EDST), Lebanese University [Beirut] (LU), Lebanese International University (LIU), Azm and Saade Association, CEDRE program, Institut National de sciences Appliquées, Nantes Université (NU)-Université de Rennes 1 (UR1), Université de Nantes (UN)-Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials science, business.industry, 020208 electrical & electronic engineering, General Physics and Astronomy, Physics::Optics, Reflector (antenna), 02 engineering and technology, 01 natural sciences, lcsh:QC1-999, [SPI.ELEC]Engineering Sciences [physics]/Electromagnetism, Optics, Modulation, 0103 physical sciences, 0202 electrical engineering, electronic engineering, information engineering, Surface impedance, Phase gradient, 010306 general physics, Anisotropy, business, Transformation optics, lcsh:Physics
Abstract

International audience; This study proposes a new approach to flatten retrodirective corner reflectors. The proposed method enables compact reflectors via Transformation Optics (TO) combined with Surface Impedance Modulation (SIM). This combination permits to relax the constraints on the anisotropic material resulting from the TO. Phase gradient approach is generalized to be used within anisotropic media and is implemented with SIM. Different reflector setups are designed, simulated and compared for í µí±“ í µí±œí µí± = 8í µí°ºí µí°»í µí± § using ANSYS ® HFSS ® in order to validate the use of such a combination.

Published
2018
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