Electron energy loss spectroscopy determination of Ti oxidation state at the (001) LaAlO3/SrTiO3 interface as a function of LaAlO3 growth conditions

At the (001) interface between the two band-insulators LaAlO3 and SrTiO3, a high-mobility electron gas may appear, which has been the object of numerous works over the last four years. Its origin is a subject of debate between the interface polarity and unintended doping. Here we use electron energy loss 'spectrum images', recorded in cross-section in a scanning transmission electron microscope, to analyse the Ti3+ ratio, characteristic of extra electrons. We find an interface concentration of Ti3+ that depends on growth conditions.Comment: 6 page

AHL-Based Quorum Sensing Regulates the Biosynthesis of a Variety of Bioactive Molecules in Bacteria

International audienc

L'état de la coopération économique et financière internationale

de Boissieu Christian, Jacquet, Le Lorier Anne, Walrafen Thierry, Le Boucher Éric. L'état de la coopération économique et financière internationale. In: Revue d'économie financière, n°33, 1995. La coopération dans le système financier international. pp. 163-185

Disrupting quorum sensing as a strategy to inhibit bacterial virulence in human, animal, and plant pathogens

International audienceAbstract The development of sustainable alternatives to conventional antimicrobials is needed to address bacterial virulence while avoiding selecting resistant strains in a variety of fields, including human, animal, and plant health. Quorum sensing (QS), a bacterial communication system involved in noxious bacterial phenotypes such as virulence, motility, and biofilm formation, is of utmost interest. In this study, we harnessed the potential of the lactonase SsoPox to disrupt QS of human, fish, and plant pathogens. Lactonase treatment significantly alters phenotypes including biofilm formation, motility, and infection capacity. In plant pathogens, SsoPox decreased the production of plant cell wall degrading enzymes in Pectobacterium carotovorum and reduced the maceration of onions infected by Burkholderia glumae. In human pathogens, lactonase treatment significantly reduced biofilm formation in Acinetobacter baumannii, Burkholderia cepacia, and Pseudomonas aeruginosa, with the cytotoxicity of the latter being reduced by SsoPox treatment. In fish pathogens, lactonase treatment inhibited biofilm formation and bioluminescence in Vibrio harveyi and affected QS regulation in Aeromonas salmonicida. QS inhibition can thus be used to largely impact the virulence of bacterial pathogens and would constitute a global and sustainable approach for public, crop, and livestock health in line with the expectations of the One Health initiative

Efficient Photoswitch System Combining a Dimethyldihydropyrene Pyridinium Core and Ruthenium(II) Bis-Terpyridine Entities

International audienc

Scientific diving in France: an overview of the current practices in science

International audienceThe French National Committee for Scientific Diving (CNPS) takes on different tasks including acting as an observatory of occupational scientific diving practices and innovations (Thouzeau et al., 2019). Since 1991 in France, scientific diving has been recognized by law as an occupational sector and is therefore regulated with the aim to reduce the hyperbaric risk. Currently, French scientific diving encompasses many fields such as underwater life sciences and ecology, geosciences, social & cultural sciences including archeology, health & food, engineering sciences, energy... Due to the existence of overseas territories - with France's maritime spaces representing the world's second largest exclusive economic zone - French territories display an extensive variety of submarine habitats. Furthermore, the historical richness of scientific diving in France has led the French scientific diving community to be involved in all oceans worldwide. All subaquatic ecosystems, from the polar regions to the tropical belt, from drowned karsts to freshwater and high altitude lakes, including mesocosms and artificial structures are studied by diving scientists. On top of the traditional diving methods (apnea, open circuit and hookah) scientific diving benefited in recent years from the use of closed-circuit rebreathers but also from combining CCR and saturation methods, which greatly enhanced the study of the mesophotic zones. In light of the diversity of environments, disciplines and scientific issues, scientific divers are continuously innovating to perform outstanding research. This presentation will give an overview of recent work from the last decade, highlighting the importance of scientific diving in science in France

Scientific diving in France: an overview of the current practices in science

European Conference on Scientific Diving, Roscoff, FRA, 14-/05/2023 - 18/05/2023International audienceThe French National Committee for Scientific Diving (CNPS) takes on different tasks including acting as an observatory of occupational scientific diving practices and innovations (Thouzeau et al., 2019). Since 1991 in France, scientific diving has been recognized by law as an occupational sector and is therefore regulated with the aim to reduce the hyperbaric risk. Currently, French scientific diving encompasses many fields such as life sciences and ecology, geosciences, social & cultural sciences including archeology, health & food, engineering sciences, energy... Due to the existence of overseas territories - with France's maritime spaces representing the world's second largest exclusive economic zone - French territories display an extensive variety of submarine habitats. Furthermore, the historical richness of scientific diving in France has led the French scientific diving community to be involved in all oceans worldwide. All subaquatic ecosystems, from the polar regions to the tropical belt, from drowned karsts to freshwater and high altitude lakes, including mesocosms and artificial structures are studied by diving scientists. On top of the traditional diving methods (apnea, open circuit and hookah) scientific diving benefits in recent years from the use of closed-circuit rebreathers but also from combining CCR and saturation methods, which greatly enhanced the study of the mesophotic zones. In light of the diversity of environments, disciplines and scientific issues, scientific divers are continuously innovating to perform outstanding research. This presentation will outline the recent work of the last decade highlighting the importance of scientific diving in science (in France).Thouzeau G., Hocdé R., Beurier J.-P., Coulange M. et al. (2019). The French National Committee on Scientific Diving (CNPS): a key actor for developing scientific diving in France. 5th European Conference on Scientific Diving (ECSD), Institute of Oceanology, Polish Academy of Sciences, Sopot, Poland, Apr 2019, Sopot, Poland. pp.61-62, doi:10.23708/fdi:01007626

La nature

De tous les « tournants » qu'aura connus la phénoménologie, celui qu'annonçait Paul Ricœur dans le compte-rendu qu’il proposait de l’ouvrage de Mikel Dufrenne paru en 1963 sous le titre Le Poétique – un tournant en direction d'une « philosophie de la nature » – est sans nul doute celui que les phénoménologues auront été les moins prompts à opérer. Pourtant, s'il est une « crise » à laquelle, comme toute philosophie, la phénoménologie est mise en demeure de se mesurer, ce n'est plus tant cette « crise des sciences » que Husserl diagnostiquait en 1935-1936 qu'une crise de la nature et de la relation que l’homme entretient avec elle, et ce faisant avec lui-même. L'objectif de ce numéro de la revue Alter est de circonscrire la place qu'est susceptible d'occuper la phénoménologie dans ce nouvel espace philosophique, et de déterminer les inflexions de ses dispositifs traditionnels qu'exige la nécessité pour elle de s'y inscrire