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« Être amis en vérité. » La vérité peut-elle se passer d’amitié ?
No full textInternational audienceLa recherche de la vérité en toute amitié conduit-elle nécessairement à sacrifier ou bien l’une ou bien l’autre ? L’amitié et la vérité s’excluent-elles à un certain point
Red light excitation: illuminating photocatalysis in a new spectrum
No full textInternational audienceRed-light-activated photocatalysis has become a powerful approach for achieving sustainable chemical transformations, combining high efficiency with energy-saving, mild conditions. By harnessing the deeper penetration and selectivity of red and near-infrared light, this method minimizes the side reactions typical of higher-energy sources, making it particularly suited for large-scale applications. Recent advances highlight the unique advantages of both metal-based and metal-free catalysts under red-light irradiation, broadening the range of possible reactions, from selective oxidations to complex polymerizations. In biological contexts, red-light photocatalysis enables innovative applications in phototherapy and controlled drug release, exploiting its tissue penetration and low cytotoxicity. Together, these developments underscore the versatility and impact of red-light photocatalysis, positioning it as a cornerstone of green organic chemistry with significant potential in synthetic and biomedical fields
Navigating Complexity: A Comprehensive Review of Heterogeneous Information Networks and Embedding Techniques
No full textInternational audienceThe adoption of heterogeneous information networks (HINs) has gained popularity as a means of modeling complex real-world systems with diverse interacting components. Despite the acknowledged advantages of HIN, a considerable number of current studies tend to treat these networks as homogeneous, neglecting the distinctions between different types of components and connections. Recently, there has been a growing recognition among researchers of the importance of treating interconnected data with multiple types as a HIN. They have developed methods to embed such data into a lower-dimensional space while preserving the diverse structures and meanings within the network. These HIN embedding methods offer versatile applications, including fraud detection, system recommendation, and disease prediction,etc. leveraging the rich semantics inherent in object types and links within the network. Although HIN provides more structural and semantic information compared to homogeneous networks, it also poses challenges for data mining. In this paper, we present a comprehensive review of the approaches, techniques, and applications employed in HIN, emphasizing the diverse methodologies identified in existing literature
Behavior of potassium uranates in peroxo-carbonate solutions: dissolution and uranyl stabilisation
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Genetic diversity and virulence gene profiling of Vibrio harveyi in a vibriosis-affected European seabass (Dicentrarchus labrax) aquaculture tank
No full textInternational audienceAquaculture is crucial in meeting global seafood demand; however, intensification often leads to bacterial diseases that threaten productivity. Dicentrarchus labrax, a key species in European aquaculture, is highly vulnerable to vibriosis, primarily caused by Vibrio harveyi. This study investigates genetic profiles associated with vibriosis by analyzing V. harveyi strains from a seabass farm during 2022 vibriosis outbreaks. Sampling from biofilm and water environments yielded 946 bacterial isolates, of which 56 were identified as V. harveyi using MALDI-TOF MS. ERIC-PCR genotyping revealed four distinct profiles. Despite observing variability in the presence of the 80 tested virulence genes, the overall genetic variation among these profiles was not pronounced. Notably, no single genotypic profile was linked to vibriosis. These findings suggest that the presence of virulence genes alone may not predict disease outbreaks, thus highlighting the need for future research on environmental and transcriptional factors to improve disease control in aquaculture systems.</div
AN ALGEBRAIC APPROACH TO SETS DEFINING MINIMAL DOMINATING SETS OF REGULAR GRAPHS
No full textSuppose that V = {1, . . . , n} is a non-empty set of n elements, S = {S 1 , . . . , S m } a non-empty set of m non-empty subsets of V . In this paper, by using some algebraic notions in commutative algebra, we investigate the question arises whether there exists an undirected finite simple graph G with V (G) = V , where S is the set whose elements are the minimal dominating sets of G.</div
Texte et enluminures du Roman de Renart (manuscrit français 12584) : un rapport au temps mouvant. Enjeux cognitifs et herméneutiques
No full textInternational audienceThis article explores and analyses the different text/image arrangements that the French manuscript BnF 12584 offers its readers. It examines their sensitive, cognitive and hermeneutic consequences in order to highlight the singular and ambivalent relationship that the miniatures have with the letter. It explores the interplay between the status of commented/commenting object and the rival temporalities at work in this very special manuscript.Cet article explore et analyse les différentes dispositions texte/image qu’offre à ses lecteurs le manuscrit français BnF 12584. Il interroge leurs conséquences sensibles, cognitives et herméneutiques pour mettre en lumière le rapport singulier et ambivalent que les miniatures entretiennent avec la lettre. Il sonde les jeux de brouillages entre les statuts d’objets commenté/commentant et mesure les temporalités rivales à l’œuvre dans ce témoin si particulier
SBA-15 supported Ni-Cu catalysts for hydrodeoxygenation of m-cresol to toluene
No full textInternational audienceAmidst concerns over fossil fuel dependency and environmental sustainability, the utilization of biomass-derived aromatic compounds emerges as a viable solution across diverse industries. In this scheme, the conversion of biomass involves pyrolysis, followed by a hydrodeoxygenation (HDO) step to reduce the oxygen content of pyrolysis oils and stabilize the end products including aromatics. In this study, we explored the properties of size controlled NiCu bimetallic catalysts supported on ordered mesoporous silica (SBA-15) for the catalytic gas-phase HDO of m-cresol, a lignin model compound. We compared their performances with monometallic Ni and Cu catalysts. The prepared catalysts contained varying Ni to Cu ratios and featured an average particle size of approximately 2 nm. The catalytic tests revealed that the introduction of Cu alongside Ni enhanced the selectivity for the direct deoxygenation (DDO) pathway, yielding toluene as the primary product. Optimal performance was observed with a catalyst composition comprising 5 wt.% Ni and 5 wr.% Cu, achieving 85 % selectivity to toluene. Further increasing the Cu content improved turnover frequency (TOF) values, but reduced DDO selectivity. These findings underscore the importance of catalyst design in facilitating biomass-derived compound transformations and offer insights into optimizing catalyst composition for more selective HDO reactions
Investigating the orientation dependence on functional properties in Bi0.5Na0.5TiO3-BaTiO3 films
No full textInternational audienceThe morphotropic phase boundary (MPB) composition in lead free (1-x) Bi0.5 Na0.5TiO3 – x BaTiO3 (BNTBT) solid solution has attracted extensive research due to its significant potential for piezoelectric and high-power energy storage applications. Here, epitaxial (001) and (111) BNTBT films with composition around the MPB are investigated. A complex domain pattern is evidenced for both film orientation, due to the coexistence of a weak polar phase and a strong polar ferroelectric phase. An electric field induced phase switching is shown in both (001) and (111) oriented film, as well as a weakening of the polar state in the (111) BNTBT film. The enhanced ergodic relaxor state in the (111) BNTBT film gives rise to a reduced piezoelectric response and improved energy storage performances. The epitaxial symmetry engineering is shown to provide a complementary approach to the composition strategy to improve the functional properties in BNTBT films
True ileal amino acid digestibility and digestible amino acid scores (DIAASs) of the cruciferin and napin fractions of rapeseed: Impact of processing
No full textInternational audienceProcesses are being developed to exploit proteins from the residue of rapeseed oil extraction. Two main fractions of proteins can be purified: cruciferin and napin. The present work was carried out to characterize the nutritional quality of these fractions, while exploring the effect of the extraction conditions (neutral or acid), and that of the post extraction process (heating 1 h, 120 • C). The true ileal digestibility (TID) of their amino acids (AA) was measured in minipigs, to calculate the digestible indispensable amino acid score (DIAAS). The TID of cruciferin was high (95 %) compared to that of napin (87 %). The extraction process and the heat treatment had no effect on the TID of napin. The DIAAS for adults was 117 % for cruciferin, and 82-89 % for napin (branched-chain AA being the limiting AA). Improving the TID of napin would enable this interesting source of cysteine and lysine to be better exploited in human nutrition