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Decoding the nexus:branched-chain amino acids and their connection with sleep,circadian rhythms,and cardiometabolic health

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Neural Regeneration Research 2025年第5期20卷 1350-1363页

作者： Hui Li Laurent Seugnet Department of Neurology Xijing HospitalXi’anShaanxi ProvinceChina Centre de Recherche en Neurosciences de lyon Integrated Physiology of the Brain Arousal Systems(WAKING)UniversitéClaude Bernard Lyon 1INSERM U1028CNRS UMR 5292BronFrance

The sleep-wake cycle stands as an integrative process essential for sustaining optimal brain function and,either directly or indirectly,overall body health,encompassing metabolic and cardiovascular *** the heightened metabolic activity of the brain,there exists a considerable demand for nutrients in comparison to other *** these,the branched-chain amino acids,comprising leucine,isoleucine,and valine,display distinctive significance,from their contribution to protein structure to their involvement in overall metabolism,especially in cerebral *** the first amino acids that are released into circulation post-food intake,branched-chain amino acids assume a pivotal role in the regulation of protein synthesis,modulating insulin secretion and the amino acid sensing pathway of target of ***-chain amino acids are key players in influencing the brain's uptake of monoamine precursors,competing for a shared *** their involvement in protein synthesis,these amino acids contribute to the metabolic cycles ofγ-aminobutyric acid and glutamate,as well as energy ***,they impact GABAergic neurons and the excitation/inhibition *** rhythmicity of branchedchain amino acids in plasma concentrations,observed over a 24-hour cycle and conserved in rodent models,is under circadian clock *** mechanisms underlying those rhythms and the physiological consequences of their disruption are not fully *** sleep,obesity,diabetes,and cardiovascular diseases can elevate branched-chain amino acid concentrations or modify their oscillatory *** mechanisms driving these effects are currently the focal point of ongoing research efforts,since normalizing branched-chain amino acid levels has the ability to alleviate the severity of these *** this context,the Drosophila model,though underutilized,holds promise in shedding new light on these *** findings indicate its po

关键词： branched-chain amino acids cardiovascular health circadian clock drosophila insulin metabolism sleep γ-aminobutyric acid

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Quaternary Ammonium-based Composite Particles for Antibacterial Finishing of Cotton-based Textiles

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Journal of Materials Science & Technology 2014年第1期30卷 19-29页

作者： M.Messaoud E.Chadeau P.Chaudouёt N.Oulahal M.Langlet LMGP(Grenoble Institute of Technology-Minatec) LRGIA(universit de lyon Universit Lyon 1)

The antibacterial finishing of cotton-based fabrics has been achieved from quaternary ammonium-based composite particles. This functionalization is based on the simple dilution of a quaternary ammonium cation （QAC） hybrid alkoxide within a sol-gel derived crystalline suspension （CS） of TiO2 in liquid solution. This protocol yields the preparation of QAC-Ti02 （QT） composite sols by using a same CS over a long period of time, and enables an easy regeneration of derived QT sols after quite long aging periods. Composite sols can then be impregnated on various kinds of substrates, including textile fabrics. Fourier transform infrared spectroscopy studies, as well as optical and scanning electron microscopy observations, have been used to investigate chemical and morphological features arising from QT particles. Antibacterial tests have then been performed on so-finished textiles and are discussed in relation to chemical and morphological features. It is shown that this sol-gel route flexibly yields a similarly strong antibacterial activity on cotton-based fabrics against both Gram-negative and Gram-positive bacteria, Le. tested fabrics exhibit an antibacterial activity （a（~cording to the ISO 20743-2005 standard） ranging between 7.5 and 7.9 against both kinds of bacteria tested here. Finishing treatments also allow preserving the hand feeling and visual aspect of the textiles and promote a rather good attachment of impregnated particles on the surface of textile fibers.

关键词： Quaternary ammonium TiO2 Antibacterial efficiency Textile Sol-gel

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Delayed Ionization and Delayed Detachment in Molecules and Clusters

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Chinese Journal of Chemical Physics 2009年第2期22卷 162-170页

作者： F. Lépine B. Baguenard B. Concina M. A. Lebeault C. Bordas université de lyon F-69522 Lyon France université lyon 1 Villeurbanne CNRS UMR 5579 LASIM

The evolution of a molecular system excited above its ionization threshold depends on a number of parameters that include the nature of the excited states and their couplings to the various continua. The general nature of the processes governing this evolution depends also essentially on the complexity of the molecule, more precisely on its size, density of states, and strength of the couplings among the various internal degrees of freedom. In this paper we address the question of the transition between autoionization that prevails in small molecules, and delayed ionization occurring in larger molecules or clusters. This transition is illustrated by autoionization of Na2 Rydberg states on one hand, delayed ionization in fullerene C60, and delayed detachment in small cluster anions on the other hand. All processes are studied in the case of nanosecond laser excitation, corresponding to a rather slow deposition of the internal energy.

关键词： Autoionization Autodetachment Thermionic emission

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Control of light emission of quantum emitters coupled to silicon nanoantenna using cylindrical vector beams

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Light(Science & Applications) 2023年第10期12卷 2248-2255页

作者： Martin Montagnac Yoann Brûlé Aurélien Cuche Jean-Marie Poumirol Sébastien J.Weber Jonas Müller Guilhem Larrieu Vincent Larrey Franck Fournel Olivier Boisron Bruno Masenelli Gérard Colas des Francs Gonzague Agez Vincent Paillard CEMES-CNRS Universitéde ToulouseToulouseFrance ICB Universitéde BourgogneCNRSDijonFrance LAAS-CNRS Universitéde ToulouseToulouseFrance CEA-LETI UniversitéGrenoble-AlpesGrenobleFrance universitéde lyon UniversitéLyon 1CNRS UMR 5510ILMVilleurbanneFrance universitéde lyon INSA LyonCNRSEcole Centrale de LyonUniversitéLyon 1CPEUMR 5270INLVilleurbanneFrance Bruno Masenelli

Light emission of europium(Eu^(3+))ions placed in the vicinity of optically resonant nanoantennas is usually controlled by tailoring the local density of photon states(LDOS).We show that the polarization and shape of the excitation beam can also be used to manipulate light emission,as azimuthally or radially polarized cylindrical vector beam offers to spatially shape the electric and magnetic fields,in addition to the effect of silicon nanorings(Si-NRs)used as *** photoluminescence(PL)mappings of the Eu^(3+)transitions and the Si phonon mappings are strongly dependent of both the excitation beam and the Si-NR *** experimental results of Raman scattering and photoluminescence are confirmed by numerical simulations of the near-field intensity in the Si nanoantenna and in the Eu^(3+)-doped film,*** branching ratios obtained from the experimental PL maps also reveal a redistribution of the electric and magnetic emission *** results show that it could be possible to spatially control both electric and magnetic dipolar emission of Eu^(3+)ions by switching the laser beam polarization,hence the near field at the excitation wavelength,and the electric and magnetic LDOS at the emission *** paves the way for optimized geometries taking advantage of both excitation and emission processes.

关键词： excitation cylindrical spatially

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Chiral supramolecular gold-cysteine nanoparticles: Chiroptical and nonlinear optical properties

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Progress in Natural Science:Materials International 2016年第5期26卷 455-460页

作者： Isabelle Russier-Antoine Franck Bertorelle Alexander Kulesza Antonin Soleilhac Amina Bensalah-Ledoux Stephan Guy Philippe Dugourd Pierre-Fran?ois Brevet Rodolphe Antoine Univ lyon université Claude Bernard lyon 1 CNRS Institut Lumière Matière

Cysteine is a sulfur-containing amino acid that easily coordinates to soft metal ions and grafts to noble metal surfaces. We report a simple synthetic approach for the production of chiral gold-cysteine polymeric nanoparticles soluble in water. Conjugation of cysteine with gold in a polymeric way, leading to;0 nm diameter nanoparticles, resulted in the generation of new characteristic circular dichroism（CD） signals in the region of 250–400 nm, whereas no CD signal changes were found with cysteine alone. We also investigate their nonlinear optical properties after two-photon absorption. Two-photon emission spectra and first hyperpolarizabilities, as obtained by the hyper-Rayleigh scattering technique, of these particles are presented.

关键词： Gold Cysteine Supramolecular chemistry Nanoparticles Chirality Nonlinear optics

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Site dependence of surface dislocation nucleation in ceramic nanoparticles

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npj Computational Materials 2021年第1期7卷 564-570页

作者： Jonathan Amodeo Emile Maras David Rodney Univ lyon CNRSINSA LyonUCBLMATEISUMR5510VilleurbanneFrance universitéde lyon UniversitéClaude Bernard Lyon 1CNRSInstitut Lumière MatièreVilleurbanneFrance

The extremely elevated strength of nanoceramics under compression arises from the necessity to nucleate highly energetic dislocations from the surface,in samples that are too small to contain pre-existing ***,we investigate the site dependence of surface dislocation nucleation in MgO nanocubes using a combination of molecular dynamics simulations,nudgedelastic-band method calculations and rate theory *** an original simulation setup,we obtain a complete mapping of the potential dislocation nucleation sites on the surface of the nanoparticle and find that,already at intermediate temperature,not only nanoparticle corners are favorable nucleation sites,but also the edges and even regions on the side surfaces,while other locations are intrinsically *** are discussed in the context of recent in situ TEM experiments,sheding new lights on the deformation mechanisms happening during ceramic nanopowder compaction and sintering processes.

关键词： deformation dislocation ceramic

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Artificial light at night decreases the pupillary light response of dark-adapted toads to bright light

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Integrative Zoology 2023年第5期18卷 867-875页

作者： Jean SECONDI Madeleine F.SCRIBA Nathalie MONDY Thierry LENGAGNE Univ lyon UniversitéClaude Bernard Lyon 1CNRSENTPEVilleurbanneFrance Facultédes Sciences Universitéd’AngersAngersFrance

Artificial light at night(ALAN)is expanding *** physiological effects have been reported in animals,but we still know little about the consequences for the visual *** pupil contributes to control incoming light onto the *** increases in light intensity evokes the pupil light reflex(PLR).Intrinsically photosensitive retinal ganglion cells(ipRGC)affect PLR and melatonin expression,which largely regulate circadian rhythms and PLR *** receive inputs from various photoreptors with different peak sensitivities implying that PLR could be altered by a broad range of light *** predicted ALAN to enhance *** to our prediction,dark-adapted cane toads Rhinella marina,exposed to ALAN(5 lx)for 12 days,exhibited a lower PLR than controls and individuals exposed to 0.04 lx,even after 1 h in bright *** cannot conclude whether ALAN induced a larger pupil size in dark-adapted toads or a slower initial ***,the response was triggered by a light source with an emission peak(590 nm)well above the sensitivity peak of melanopsin,the main photoreceptor involved in ***,ALAN alters the capacity of toads to regulate the incoming light in the eye at night,which may reduce the performance of visually guided behaviors,and increase mortality by predators or road kills at *** first study emphasizes the need to focus on the effect of ALAN on the vision of nocturnal organisms to better understand how this sensory system is altered and anticipate the consequences for organisms.

关键词： amphibian anuran light pollution pupillary light reflex vision

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From the dilute solution to the pure compound:Extraction strategy based on a multi-stage process of phase separation

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Science China Chemistry 2010年第9期53卷 2070-2076页

作者： GOUTAUDIER Christelle TENU Richard COUNIOUX Jean-Jacques université de lyon Université Claude Bernard Lyon 1Laboratoire Multimatériaux et Interfaces

It is very rare that a one-step process of extraction leads to the pure compound with a high degree of purity specified by an industrial *** various stages of a synthesis process and possible secondary reactions may lead to the synthesis of more or less complex and highly diluted *** this work,the rationale and strategy for extraction and purification of a high added value compound are *** the thinking is based on the knowledge and the exploitation of phase diagrams and then developed for different unit operations of the *** most significant research tools are the experimental data and the modelling of phase equilibrium to estimate the yield of each step of *** significant example chosen involves all the basic methods of phase separation,starting with liquid-vapour equilibrium:stripping of high volatility components and then more or less complex distillation are classically *** theoretical plateau number can be deduced from the equilibrium equation *** second step is based on the study of the liquid-liquid equilibrium and is an intermediate step for enrichment of the solution when distillation is not possible.A final step based on solid-liquid equilibrium consists of the selective crystallization of the pure product at low temperature,in order to satisfy the requirements of purity and safety imposed by industrial *** conclusion includes all isolation operations in the form of a general extraction and purification scheme.

关键词： phase diagram azeotropic distillation liquid-liquid extraction selective crystallization

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Modification of the adsorption and catalytic properties of micro-and mesoporous materials by reactions with organometallic complexes

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Science China Chemistry 2010年第9期53卷 1862-1869页

作者： LEFEBVRE Frédéric PUTAJ Piotr BASSET Jean-Marie université de lyon ICL C2P2 UMR 5265(CNRS-CPE-Université Lyon 1) LCOMS-CPE Lyon

This review describes the work of two laboratories in the field of the modification of micro-and mesoporous molecular sieves through reactions with organometallic *** modification of zeolites can occur inside the pore channels or on the external surface,depending on the size of the organometallic *** the modification occurs on the external surface,it results in a decrease of the pore entrance,which will lead in turn to a modification of the sorption properties of the zeolite,by decreasing the rate of the adsorption(mainly by a kinetic control).Such a material can be also used in catalysis,because the external acid sites,which are responsible for side-reactions,have been removed upon *** small organometallic complexes are used,they can fill the channels and cages of the zeolite and react with internal hydroxyl *** to the high acidity of zeolites,the reaction occurs very easily(for example at-100℃ on faujasite),in contrast to what is observed on the external surface,therefore leading to high metal *** that case,the modification of the sorption properties will be mainly related to a thermodynamic *** resulting materials can be useful in catalysis,by combining the activity of the organometallic complex and properties(for example shape-selectivity) of the *** of mesoporous molecular sieves occurs always in the pores and results in altering of the sorption properties of the solid,by changing the interaction type between the sorbent and the *** example the sorption isotherm of alkanes is changed from type II to type III according to the IUPAC nomenclature.

关键词： zeolites transition metals organometallic compounds adsorption properties

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Phosphorus mobility in dam reservoir affected by redox oscillations:An experimental study

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Journal of Environmental Sciences 2019年第3期31卷 250-263页

作者： Anne Rapin Malgorzata Grybos Marion Rabiet Brice Mourier Véronique Deluchat université de Limoges PEIRENE EA 7500 Faculté des Sciences et Techniques université de lyon UMR5023 Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés Université Lyon 1ENTPE CNRS

The internal sedimentary phosphorus(P) load of aquatic systems is able to support eutrophication, especially in dam–reservoir systems where sedimentary P stock is high and where temporary anaerobic conditions occur. The aim of this study therefore is to examine the response of sedimentary P exposed to redox oscillations. Surface sediments collected in the Champsanglard dam–reservoir(on the Creuse River, France) were subjected to two aerobic phases(10 and 12 days) alternated with two anaerobic periods(21 and 27 days)through batch incubations. The studied sediment contained 77 ± 3 μmol/g DW of P, mainly associated with the ascorbate fraction(amorphous Fe/Mn oxyhydroxides). The used sediment was rich in organic matter(OM)(21% ± 1%) with primarily allochthone *** results showed that redox oscillations enhance dissolved inorganic phosphorus release at sediment/water interface. During the first anaerobic stage, the P release was mainly controlled by the dissolution/precipitation of iron minerals. The more pronounced increase of P release during the second anaerobic stage(44%) was due to various mechanisms related to the change in quality of dissolved organic matter(DOM), namely a higher SUVA254 and humification indices. The release of more refractory DOM(rDOM) served to lower the microbial metabolism activity, possibly favored iron oxyhydroxide aggregation and thus limiting iron reduction. In addition, rDOM is able to compete for mineral P sorption sites,leading to a greater P release. In reservoir with predominant allochthone OM input, the release of more aromatic DOM therefore plays an important role in P mobility.

关键词： Phosphorus Sediment Redox Iron Organic matter

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