Newborns discriminate novel from harmonic sounds: a study using magnetoencephalography

Objective: We investigated whether newborns respond differently to novel and deviant sounds during quiet sleep. Methods: Twelve healthy neonates were presented with a three-stimulus oddball paradigm, consisting of frequent standard (76%), infrequent deviant (12%), and infrequent novel stimuli (12%). The standards and deviants were counterbalanced between the newborns and consisted of 500 and 750 Hz tones with two upper harmonics. The novel stimuli contained animal, human, and mechanical sounds. All stimuli had a duration of 300 ms and the stimulus onset asynchrony was 1 s. Evoked magnetic responses during quiet sleep were recorded and averaged offline. Results: Two deflections peaking at 345 and 615 ms after stimulus onset were observed in the evoked responses of most of the newborns. The first deflection was larger to novel and deviant stimuli than to the standard and, furthermore, larger to novel than to deviant stimuli. The second deflection was larger to novel and deviant stimuli than to standards, but did not differ between the novels and deviants. Conclusions: The two deflections found in the present study reflect different mechanisms of auditory change detection and discriminative processes. Significance: The early brain indicators of novelty detection may be crucial in assessing the normal and abnormal cortical function in newborns. Further, studying evoked magnetic fields to complex auditory stimulation in healthy newborns is needed for studying the newborns at-risk for cognitive or language problems

Traitement tout optique du signal à base de composants à cristaux photoniques en matériaux semiconducteurs III-V.

Ces travaux de thèse sont consacrés à l'étude expérimentale de fonctions de traitement optique de signaux, multiplexés en longueur (WDM) ou en temps (OTDM), à base de composants à cristaux photoniques (CPh) en matériaux semi-conducteurs III-V réalisés dans le cadre du projet européen Copernicus. Les propriétés dispersives singulières qu'il est possible d'obtenir dans ces structures ont été étudiées au travers d'effets non linéaires améliorés dans le régime de lumière lente. Ainsi, une étude sur le mélange à quatre ondes a été réalisée avec des applications de conversion de longueur d'onde à haut débit et de démultiplexage temporel. Par ailleurs, de la génération de seconde harmonique a été démontrée avec une efficacité record pour ce type de structure, et appliquée au monitoring de signaux télécoms à 42,5 Gbit/s. Des nanocavités CPh ont été utilisées en tant que filtres extracteurs de longueurs d'onde pour démontrer le démultiplexage d'un signal WDM à 100 Gbit/s. Par la suite, nous avons travaillé sur une plate-forme photonique hybride. L'intégration hétérogène de nanocavités CPh en semi-conducteurs III-V sur des guides silicium nous a permis de réaliser de la commutation optique très rapide appliquée à des fonctions de conversion de longueur d'onde jusqu'à 20 Gbit/s et de limiteur de puissance à 10 Gbit/s. Tous ces résultats sont très prometteurs pour l'intégration photonique avec la micro-électronique et la technologie CMOS. Par le biais de ces travaux, nous montrons que les cristaux photoniques, de par leurs propriétés de con nement et de ralentissement de la lumière, sont des structures particulièrement intéressantes pour la réalisation de fonctions de traitement du signal sur porteuse optique.This thesis is devoted to the experimental study of optical processing functions, of wavelength multiplexed (WDM) or time multiplexed (OTDM) signals, based on III-V semiconductors photonic crystals (PhC) devices produced in the European project Copernicus. The unique dispersive properties that is possible to obtain in such a structure were studied through nonlinear effects enhanced in slow light regime. Thus, a study of four-wave mixing was performed with high bit rate wavelength conversion and time demultiplexing applications. Moreover, second harmonic generation has been demonstrated with record efficiency for such a structure, and applied to 42.5 Gbit/s telecom signals monitoring. PhC nanocavities were used as wavelength drop filter to demonstrate 100 Gbit/s WDM signal demultiplexing. Thereafter, we worked on hybrid photonic platform. The heterogeneous integration of III-V PhC nanocavity on silicon waveguide allowed us to perform very fast optical switching, applied to wavelength conversion up to 20 Gbit/s and power limiting function at 10 Gbit/s. All of these results are very promising for future photonic integration with micro-electronics and CMOS technology. Through this work, we show that PhC, owing to their confinement and slow light properties, are structures particularly interesting to perform optical processing functions.RENNES1-Bibl. électronique (352382106) / SudocSudocFranceF

Nutritionally adequate, healthy, and climate-friendly diets following the Nordic Nutrition Recommendations 2023: an optimization study for Norway

BackgroundReducing red meat consumption is an effective tactic for decreasing environmental impact of diets while maintaining nutritional adequacy, healthiness, and overall consumer acceptability. Still, dietary change in favor of plant foods is a controversial climate mitigation measure, especially in the Nordic region where agri-food heritage is linked to ruminant husbandry.ObjectiveIn this study we aimed to explore sustainable diets for the Norwegian context by (1) investigating the environmental impacts of nutritionally optimized diets following the Nordic Nutrition Recommendations 2023 (NNR2023), (2) estimating potential for environmental impact reduction across scenarios of meat and legume consumption, and (3) identifying nutritional challenges.MethodsQuadratic optimization was employed to minimize departure from the average observed Norwegian diet while meeting nutrient, health, and carbon footprint constraints. The diet of Norwegian adults was estimated based on results from the national dietary survey Norkost 3. Global warming potential (GWP), freshwater and marine eutrophication, terrestrial acidification, water use, and transformation and use of land were calculated using data from the Norwegian Life Cycle Assessment Food Database version 01. Diets were optimized to meet NNR2023 nutrition and health recommendations for nutrients and food groups. Optimizations were first run without constraints on GWP, for three diet scenarios: (1) nutrients and health-based targets for food amounts (NNR2023), (2) nutrients and health-based targets for food amounts with ruminant meat ≥ observed intake (62 g/day) (Ruminant), and (3) nutrients and health-based targets for food amounts with legumes content ≥40 g/day (Legumes). Then, GWP constraints were applied in 5% increments until no solution was found. The optimal diet for each scenario was defined as the diet with the largest feasible reduction in GWP (NNR2023+/Ruminant+/Legumes+).ResultsOptimizing the diet to meet nutrient and health constraints alone resulted in a modest decrease in GWP (NNR2023); retaining ruminant meat consumption (Ruminant) impeded the reduction (−9% vs. 0%). Diets following NNR2023 nutrient and health constraints alone were feasible up until a 30% reduction in GWP (NNR2023+). A 35% reduction in GWP was achieved when legumes were added to the diet (Legumes+), while diets retaining 62 g of ruminant meat were not identified beyond a 15% reduction in GWP (Ruminant+). Sodium and selenium were the strongest limiting constraints in all scenarios. Diets with a 40% reduction in GWP were identified when nutrient constraints were lowered from the Recommended Intake to the Average Requirement (NNR2023+/Legumes+). Reductions in GWP coincided with reductions in all measured environmental indicators except marine eutrophication.ConclusionThe NNR2023 guidelines outline diets that have generally lower environmental impacts than the average Norwegian diet, though outcomes depend on distribution of meat and legume consumption in the diet. Regardless of degree of environmental impact reduction, diets following NNR2023 guidelines will require significant dietary changes compared to observed intake, including an increase in consumption of fruits, vegetables, and grains, and a strong decrease in consumption of red meat, total meat, and discretionary foods. Preventing the model from removing any ruminant meat from the diet limited GWP reduction to 15% and induced considerable changes in intake of other food groups, especially a decrease in other types of meat

STIM1 R304W in mice causes subgingival hair growth and an increased fraction of trabecular bone

Calcium signaling plays a central role in bone development and homeostasis. Store operated calcium entry (SOCE) is an important calcium influx pathway mediated by calcium release activated calcium (CRAC) channels in the plasma membrane. Stromal interaction molecule 1 (STIM1) is an endoplasmic reticulum calcium sensing protein important for SOCE. We generated a mouse model expressing the STIM1 R304W mutation, causing Stormorken syndrome in humans. Stim1R304W/R304W mice showed perinatal lethality, and the only three animals that survived into adulthood presented with reduced growth, low body weight, and thoracic kyphosis. Radiographs revealed a reduced number of ribs in the Stim1R304W/R304W mice. Microcomputed tomography data revealed decreased cortical bone thickness and increased trabecular bone volume fraction in Stim1R304W/R304W mice, which had thinner and more compact bone compared to wild type mice. The Stim1R304W/+ mice showed an intermediate phenotype. Histological analyses showed that the Stim1R304W/R304W mice had abnormal bone architecture, with markedly increased number of trabeculae and reduced bone marrow cavity. Homozygous mice showed STIM1 positive osteocytes and osteoblasts. These findings highlight the critical role of the gain-of-function (GoF) STIM1 R304W protein in skeletal development and homeostasis in mice. Furthermore, the novel feature of bilateral subgingival hair growth on the lower incisors in the Stim1R304W/R304W mice and 25 % of the heterozygous mice indicate that the GoF STIM1 R304W protein also induces an abnormal epithelial cell fate

Wirtschaft Recht [Business Law]

Das Abiturwissen ist ein Übungs and Nachschlagerwerk für Schüler, die die Oberstufe (Sekundarstufe II, Kollegstufe, differenzierte gymnasiale Oberstufe) des Gymnasiums oder anderer vergleichbarer Schulen besuchen, zugleich für alle, die auf dem Zweiten Bildungsweg oder im Selbststudium ein der Reifeprüfung vergleichbares Bildungsziel anstreben. Es ist außerdem als Repetitorium für Studenten der Anfangssemester gedacht. [This course of lecture is intended for students at grade 11 to 13 Gymnasium up to Matriculation and for undergraduate students as a souce of reference and as an encyclopaedia for students in self-preparation of their university studies.

A Wrinkle in time = kerutan dalam waktu

267 hal.; 21 cm