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DTSTART;TZID=Europe/Paris:20260330T090000
DTEND;TZID=Europe/Paris:20260330T110000
DTSTAMP:20260613T182531
CREATED:20260227T100731Z
LAST-MODIFIED:20260227T151057Z
UID:10000080-1774861200-1774868400@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Mohammad CHORFA (IBS/Groupe Synchrotron)
DESCRIPTION:Effets de la dynamique structurale d’une famille de protéines fluorescentes infrarouges sur leurs propriétés de fluorescence\nRésumé : \nCe travail de thèse consiste en une étude structurale approfondie d’une famille de protéines fluorescentes infrarouges (IFP) développées à partir du bactérophytochrome d’une bactérie Gram-négative du genre Bradyrhizobium\, constituée de la protéine mIFP et de ses variants décalés vers le bleu iBlueberry et iBlueberry2. Les IFP présentent un fort intérêt en imagerie de corps entier en raison de l’existence d’une fenêtre optique des tissus entre 650 et 900 nm\, au-dessus du domaine de longueur d’onde dans lequel l’hémoglobine et la déoxi-hémoglobine absorbent\, et en-dessous du domaine dans lequel l’eau et les lipides absorbent et diffusent la lumière. Les protéines étudiées ici présentent un pic d’émission de fluorescence entre 660 et 720 nm. \nLe bactériophytochrome et les IFP qui en sont dérivées utilisent la biliverdine\, un produit du catabolisme des hèmes\, comme chromophore afin d’absorber la lumière entre 640 et 690 nm. L’étude structurale a permis de montrer qu’une boucle localisée au voisinage de la biliverdine pouvait aborder un grand nombre de conformations\, à la différence des autres phytochromes et IFP étudiés jusqu’à présent\, où cette boucle ne semble posséder qu’une seule conformation. La conséquence de cette fluctuation conformationnelle est la présence d’une configuration du chromophore jamais encore observée menant à une conformation compacte du macrocycle formé par les quatre cycles pyrroles de la biliverdine\, distincte de la conformation linéaire\, ou étendue\, habituellement observée. Les spectroscopies d’absorption UV-Visible et d’émissions de fluorescence in crystallo\, c’est-à-dire directement appliquées aux cristaux\, ont permis de montrer que la conformation compacte du chromophore menait à un pic d’émission de fluorescence au-delà de 760 nm pour iBlueberry et iBlueberry 2\, et de 800 nm pour mIFP. Cette conformation semble être favorisé par l’empilement cristallin\, et être seulement très faiblement peuplée en solution. \nL’analyse des séquences de bactériophytochromes et d’IFP a permis de mettre en évidence la conformation particulière du coude beta au début de la boucle en question. L’ingénierie de ce coude beta chez un membre d’une autre famille de protéines fluorescentes a montré qu’elle permettait effectivement d’augmenter la plasticité de la boucle. \nCe travail donne des pistes pour modifier la configuration du chromophore au sein de la protéine par ingénierie rationnelle\, notamment en utilisant des méthodes basées sur l’intelligence artificielle\, et ainsi permettre d’obtenir de nouvelles IFPs avec des maxima d’émission en plein milieu de la fenêtre optique des tissus\, afin de mieux utiliser celle-ci dans des expériences de marquage à plusieurs couleurs en imagerie tissulaire ou de corps entier. \nContact :ibs.seminaires@ibs.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-mohammad-chorfa-ibs-groupe-synchrotron/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260331T140000
DTEND;TZID=Europe/Paris:20260331T160000
DTSTAMP:20260613T182531
CREATED:20260227T101524Z
LAST-MODIFIED:20260227T151214Z
UID:10000082-1774965600-1774972800@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Espérance AHO (IBS/Groupe Structure et Activité des Glycosaminoglycanes)
DESCRIPTION:Structural and Functional effect of CXCL12/Heparan Sulfate Interactions at the Cell Surface\nRésumé : \nThe glycocalyx is a protective layer covering the surface of cells\, particularly endothelial cells\, and represents a major regulator of cell-environment interactions. It functions as a mechanical barrier\, a mechanosensor\, and a signalling platform that controls vascular permeability. In inflammatory and tumor contexts\, alterations in glycocalyx structure and density promote increased cell adhesion\, extravasation\, and metastatic dissemination. Structurally\, the glycocalyx is composed of glycolipids\, glycoproteins and proteoglycans bearing glycosaminoglycan (GAG) chains\, including heparan sulfate (HS). These linear polysaccharides\, organized into sulfated and non-sulfated domains\, interact with numerous proteins\, including growth factors and chemokines\, thereby modulating their bioavailability and biological activity. Notably\, chemokine-HS interactions are essential for the formation of chemotactic gradients involved in leukocyte recruitment\, inflammatory extravasation\, and tumor progression. The chemokine CXCL12 (stromal cell-derived factor-1\, SDF-1)\, a member of the CXC chemokine family\, exists as six distinct isoforms generated by alternative splicing of the CXCL12 gene. These isoforms share a common N-terminal sequence but differ in their C-terminal extensions\, which influence their interactions with HS. Among them\, CXCL12γ isoform\, characterized by its exceptionally high affinity for HS\, represent a particularly relevant candidate. \nThis work builds upon previous findings from our group showing\, using biophysical approaches (QCM-D\, FRAP)\, that CXCL12 is able to induce cross-linking of HS chains on biomimetic surfaces\, resulting in HS rigidification\, decreased layer thickness\, and reduced HS lateral mobility. These observations suggest that chemokine-HS interactions can modify the physical properties of HS beyond a simple ligand-presentation role. The central hypothesis of this project is that binding of the CXCL12γ to HS induces remodelling of the endothelial glycocalyx at the cell surface thereby changing cellular mechanical properties and promoting immune cell adhesion. Here\, we investigate the impact of CXCL12γ on HS organization across molecular\, nanoscale\, and cellular levels by combining biomimetic surfaces\, biophysical approaches\, super-resolution microscopy\, and cell-based assays. \nWe show that CXCL12γ reorganizes HS chains at the endothelial cell surface and that all HS-binding sites are required for efficient HS rigidification and network reorganization. CXCL12γ-driven remodeling of the glycocalyx reduces HS thickness and alters its nanoscale topology\, thereby promoting paracellular permeability and formation of adhesive platforms that facilitate leukocyte capture\, and firm adhesion. \nContact : ibs.seminaires@ibs
URL:https://sfp-alpes.fr/event/esperance-aho-ibs-groupe-structure-et-activite-des-glycosaminoglycanes/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260402T103000
DTEND;TZID=Europe/Paris:20260402T113000
DTSTAMP:20260613T182531
CREATED:20260320T100322Z
LAST-MODIFIED:20260320T100733Z
UID:10000103-1775125800-1775129400@sfp-alpes.fr
SUMMARY:Karine PHILIPPOT (Laboratoire de Chimie de Coordination du CNRS (LCC-CNRS)\, Toulouse\, France)
DESCRIPTION:Design of nanocatalysts following molecular chemistry principles\nRésumé : \nDue to their singular properties and potential applications in various fields\, considerable effort is being devoted to the design of metal-based nanomaterials. The « Metal Nanoparticle Engineering » team at LCC-CNRS (Toulouse\, France) has developed an effective toolkit for the synthesis of controlled metal nanoparticles using concepts from molecular chemistry. This approach is based on the hydrogenation of organometallic or metallo-organic complexes under mild conditions (ambient temperature; 3 bar H2) in the presence of ligands as stabilising agents. (1) This approach makes it possible to obtain small nanoparticles (<10 nm) with controlled composition\, either monometallic or bimetallic (alloy\, core-shell\, surface-decorated). These nanoparticles can be deposited on a support by simple impregnation or by direct synthesis in the presence of the chosen support (polymers\, ionic liquids\, silica\, alumina\, carbonaceous materials\, etc.). These metal nanoparticle systems are suitable models for fundamental research. They find applications in various fields such as catalysis. (2\,3) Non exhaustive examples concern biomass valorization (4)\, hydrogenation catalysis (4-6) including reduction of CO2\, (7) or electrocatalytic (8-11) or photocatalytic (12-13) water splitting process. \nReferences : \n1 C. Amiens\, D. Ciuculescu-Pradines\, K. Philippot\, Coord. Chem. Rev.\, 2016\, 38\, 409-432.\n2 M. R. Axet\, K. Philippot\, Chem. Rev 2020\, Chem. Rev. 2020\, 120\, 2\, 1085-1145.\n3 Nanoparticles in Catalysis: Advances in Synthesis and Applications\, Wiley-VCH\, K. Philippot & A. Roucoux (Eds.)\, 2021.\n4 M. Cardona\, P. Lecante\, C. Dinoi\, I. del Rosal\, R. Poteau\, K. Philippot\, M. Rosa Axet\, Green Chemistry\, 2021\, 23\, 8480-8500.\n5 C. J Abou-Fayssal\, C. Fliedel\, R. Poli\, A. Riisager\, K. Philippot\, E. Manoury\, Materials Today Chemistry\, 2023\, 34\, 101752 (https://doi.org/10.1016/j.mtchem.2023.101752).\n6 D. Krishnan\, L. Schill\, M. R. Axet\, K. Philippot\, A. Riisager\, ChemCatChem 2024\,16(4) : e20230144.\n7 X.-P. Fu\, L. Peres\, J. Esvan\, C. Amiens\, K. Philippot\, N. Yan\, Nanoscale\, 2021\, 13\, 8931-8939.\n8 J. Creus\, S. Drouet\, S. Suriñach\, P. Lecante\, V. Collière\, R. Poteau\, K. Philippot\, J.García-Antón\, X. Sala\, ACS Catalysis.\, 2018\, 8\, 11094-11102.\n9 L. Mallón\, J. Navarro-Ruiz\, C. Cerezo-Navarrete\, N. Romero\, I. del Rosal\, J. García-Antón\, R. Bofill\, L. M. Martínez-Prieto\, K. Philippot\, R. Poteau\, X. Sala\, ACS Applied Materials &\nInterfaces 2025\, 17(4)\, 6198-6210.\n10 Nanoscale NiCu electrocatalyst for the hydrogen evolution reaction\, T. Straistari\, N. Romero\, J. Esvan\, M. Gil Sepulcre\, C. Amiens\, O. Rüdiger\, S. Debeer\, S. Cavaliere\, K. Philippot\, Nanoscale 2025\, 17\, 17592-17603.\n11 Regulating NiFeOOH oxidation states through ruthenium incorporation\, L. Mallón\,1\, L. Peres\, N. Rivas\, A. Garzón Manjón\, C. Scheu\, M. Gil-Sepulcre\, O. Rüdiger\, S. DeBeer\, N. Romero\, J.\nEsvan\, J. García-Antón\, L. Rodríguez-Santiago\, X. Solans-Monfort\, R. Bofill\, K. Philippot\, L. Francàs\, X. Sala\, J. Mater. Chem. A\, 2026\, in press.\n12 N. Romero\, F. Sabuzi\, M. Forchetta\, M. Natali\, R. Signorini\, R. Bofill\, L. Francàs\, M. Gil-Sepulcre\, O. Rüdiger\, S. DeBeer\, J. García-Antón\, K. Philippot\, P. Galloni\, A. Sartorel\, X. Sala\, Green Chemistry 2025\, 27\, 4352-4368.\n13 Dyadic Ru-based Nanomaterials for Visible Light-driven Photocatalytic Hydrogen Evolution\, G. Martí\, M. Aliqué\, I. López\, L. Francàs\, R. Bofill\, O. Schott\, G. S. Hanan\, N. Romero\, K. Philippot\, A. Llobet\, M. Natali\, J. García-Antón\, X. Sala\, Applied Surface Science\, 2026\, 716\, 164621 \nContact : carole.duboc@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/karine-philippot-laboratoire-de-chimie-de-coordination-du-cnrs-lcc-cnrs-toulouse-france/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260402T133000
DTEND;TZID=Europe/Paris:20260402T153000
DTSTAMP:20260613T182531
CREATED:20260320T101509Z
LAST-MODIFIED:20260320T101610Z
UID:10000104-1775136600-1775143800@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Alix HAUREZ / DCM (équipe CIRe)
DESCRIPTION:Electroréduction du CO2 en méthane par des nanoparticules de cuivre générées in-situ\n  \nRésumé : A venir \n  \nContact : Nathalie.Camerino@univ-grenoble-alpes.fr \n 
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-alix-haurez-dcm-equipe-cire/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Soutenance,Soutenance de Thèse
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260402T160000
DTEND;TZID=Europe/Paris:20260402T183000
DTSTAMP:20260613T182531
CREATED:20260206T152029Z
LAST-MODIFIED:20260206T152359Z
UID:10000057-1775145600-1775154600@sfp-alpes.fr
SUMMARY:Carole ESCARTIN (directrice de recherche à NeuroPSI\, CNRS\, Université Paris-Saclay)
DESCRIPTION:Les cellules gliales dans les maladies neurodégénératives : rôles émergents et potentiel thérapeutique\nRésumé : \nLes neurones ne sont pas seuls dans le cerveau. A leur côté\, plusieurs types de cellules\, collectivement appelées « cellules gliales »\, remplissent de nombreux rôles essentiels pour le bon fonctionnement et la survie des neurones. Ces cellules leur apportent des substrats énergétiques\, assurent la défense contre des pathogènes\, éliminent certains déchets cellulaires\, et même régulent la façon dont les neurones transmettent et traitent l’information nerveuse. \nAu final\, les cellules gliales qui restent souvent dans l’ombre des neurones\, sont des partenaires actifs permettant au cerveau de fonctionner\, mais aussi d’apprendre et de s’adapter. \nDepuis plusieurs années\, les chercheurs découvrent que ces cellules jouent aussi un rôle important dans de nombreuses maladies qui touchent le cerveau. En effet\, ces cellules se transforment en contexte pathologique\, elles sont dites « réactives ». Ces changements peuvent avoir des conséquences majeures – positives ou négatives – sur les neurones et leur survie. \nLes cellules gliales sont l’objet d’études variées pour comprendre leurs rôles dans le cerveau sain et pathologique\, ouvrant des nouvelles pistes thérapeutiques pour de nombreuses maladies cérébrales. \n_ \nToutes les informations sont disponibles sur : https://indico.ijclab.in2p3.fr/event/12390/ \nContact : louis.fayard@IJCLAB.INP3.FR \n 
URL:https://sfp-alpes.fr/event/carole-escartin-directrice-de-recherche-a-neuropsi-cnrs-universite-paris-saclay/
LOCATION:Laboratoire IJCLab – Auditorium Pierre Lehmann\, Rue Ampère\, Orsay cedex\, 91898\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260403T110000
DTEND;TZID=Europe/Paris:20260403T120000
DTSTAMP:20260613T182531
CREATED:20260402T145658Z
LAST-MODIFIED:20260402T145805Z
UID:10000115-1775214000-1775217600@sfp-alpes.fr
SUMMARY:Juan FONTECILLA-CAMPS (IBS/Groupe Métalloprotéines)
DESCRIPTION:Origin and evolution of the eukaryotic cell : the emergence of cooperation\, competition and altruisme\nRésumé : \n\nThe evolutionary transition from prokaryotes to eukaryotes most likely involved the fusion of an archeon with a bacterium. One important consequence of this fusion was an increase in mean gene length in protists to about 1500 nucleotides\, and corresponding 500 amino acids-long proteins. The subsequent evolution of plants and metazoans resulted in a lengthening of their genes (to over 10\,000 nucleotides per gene in vertebrates). However\, the coded proteins remained at an average length of also about 500 amino acids. The significance of the difference in gene length but constant protein size has been the subject of some controversy.\nA second result of the evolutionary transition from prokaryotes to eukaryotes was the emergence of competition\, cooperation and even altruism\, between cells. These interactions cover a large spectrum going from single-cell organisms to mammals like us. Indeed\, recent studies have shown that cancer cells do collaborate during tumor growth.​\n\nThese two subjects will be discussed during the seminar.​​​\n\n\n—\n\n\nLes séminaires et soutenances sont ouverts à tous\, notez toutefois que l’accès au campus EPN nécessite un avis de rendez-vous. Merci de remplir ce formulaire  et de l’adresser\, plus de 48h à l’avance\, à ce contact. Pensez à vous munir d’une pièce d’identité le jour de votre visite.
URL:https://sfp-alpes.fr/event/juan-fontecilla-camps-ibs-groupe-metalloproteines/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260421T140000
DTEND;TZID=Europe/Paris:20260421T160000
DTSTAMP:20260613T182531
CREATED:20260402T154628Z
LAST-MODIFIED:20260402T154831Z
UID:10000118-1776780000-1776787200@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Eymeline PAGEOT (IRIG / IBS)
DESCRIPTION:Decoding chaos : a cryo-em walk through physarum polycephalum heterogeneous cell extracts\nRésumé : \n\nCryo-electron microscopy (cryo-EM) has become a central method in structural biology for determining high-resolution structures of macromolecular assemblies. However\, most cryo-EM studies still rely on highly purified samples\, which limits the range of biological systems that can be investigated. In recent years\, the analysis of cell extracts by single particle cryo-EM has emerged as an alternative strategy to explore the structural diversity of cellular proteins directly from complex mixtures. Despite its potential\, this approach remains technically challenging due to the high level of heterogeneity present in such samples and the difficulty of identifying proteins without complementary techniques such as mass spectrometry.\n\n​ The work presented in this thesis investigates the feasibility of using cryo-EM as a primary discovery tool to determine and identify protein structures directly from fractionated cell extracts. The study focuses on the plasmodial slime mould Physarum polycephalum\, a non-model eukaryotic organism whose structural proteome is largely unexplored. In contrast to most previous studies in the field\, protein identification relied solely on structural information derived from cryo-EM reconstructions.\n\nCell extracts from P. polycephalum were fractionated using biochemical separation methods and analysed by cryo-EM. Because such samples contain a wide range of proteins with different sizes\, shapes\, and abundances\, dedicated image processing strategies were developed to address the challenges posed by particle heterogeneity and flexibility. Particular attention was given to 2D classification\, particle sorting\, and iterative particle picking strategies to improve the recovery of multiple particle orientations and increase the number of particles contributing to 3D reconstructions.\n\nUsing these approaches\, fourteen macromolecular assemblies were identified and solved directly from the heterogeneous samples. In cases where the cryo-EM maps reached sufficient resolution\, atomic models could be built ab initio. For lower-resolution structures\, identification relied on structural comparison with known protein folds and structures predicted by generative tools. This work demonstrates that protein identity and putative function can be inferred directly from the structural information\, opening the possibility of structure-based genome annotation in poorly characterised organisms.\n\nBeyond the individual structures determined in this study\, this work also outlines the methodological challenges associated with large-scale structural exploration of complex biological mixtures. The largely manual nature of several steps in the workflow currently limits the throughput of the approach. Strategies to automate key stages of the pipeline\, including particle classification\, initial model generation\, and structural identification\, are therefore discussed as important directions for future development.​\n\nFinally\, this work highlights the importance of community-driven analysis and open data sharing for the continued development of large-scale structural exploration approaches. Making both the raw cryo-EM data and the solved structures publicly available enables other researchers to further investigate the dataset\, potentially identifying additional structures and improving the analysis using new computational methods\, as well as enabling the development of the methods themselves. In the longer term\, combining such « shotgun » cryo-EM approaches with advances in computational modelling and high-throughput data analysis may contribute to the systematic structural characterisation of cellular proteomes.\n\n​​–\n\n\n\nLes séminaires et soutenances sont ouverts à tous\, notez toutefois que l’accès au campus EPN nécessite un avis de rendez-vous. Merci de remplir ce formulaire  et de l’adresser\, plus de 48h à l’avance\, à ce contact. Pensez à vous munir d’une pièce d’identité le jour de votre visite.
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-eymeline-pageot-irig-ibs/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260423T130000
DTEND;TZID=Europe/Paris:20260423T140000
DTSTAMP:20260613T182531
CREATED:20260327T093519Z
LAST-MODIFIED:20260410T081351Z
UID:10000114-1776949200-1776952800@sfp-alpes.fr
SUMMARY:Anamaria NESCULEA (LBBE - Lyon)
DESCRIPTION:Genomic correlates of convergent phenotypic evolution in birds\nContact : lucie.lamothe@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/anamaria-nesculea-lbbe-lyon/
LOCATION:IMAG – Salle de Réunion\, 150 place du Torrent\, St Martin d’Hères\, 38400\, France
CATEGORIES:Séminaire
ORGANIZER;CN="TIMC - IMAG":MAILTO:lucie.lamothe@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260423T140000
DTEND;TZID=Europe/Paris:20260423T160000
DTSTAMP:20260613T182531
CREATED:20260402T155914Z
LAST-MODIFIED:20260402T155920Z
UID:10000119-1776952800-1776960000@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Moritz KIRCHNER (IRIG / IBS)
DESCRIPTION:Molecular bases of a multiprotein assembly linking membrane biology to stress adaptation in enterobacteria\nRésumé : \n\nEnteric bacteria encounter a variety of stress factors when infecting their host. This includes but is not limited to acid stress\, oxygen limitation and antibiotic stress. Bacteria counteract such stressors using various stress response systems. A central factor in the stress adaptation of enterobacteria is their cell envelope\, in particular their cell membrane. A system of proteins which has been demonstrated to be involved in multiple stress adaptation pathways is the RavA-ViaA-LdcI triad in Escherichia coli. RavA and ViaA are two proteins with as of yet unknown function that have been shown to sensitise E. coli to aminoglycoside antibiotics under anaerobic conditions. RavA forms a large complex with LdcI\, an inducible lysine decarboxylase which is one of the central enzymes involved in acid stress response of E. coli. Both RavA and ViaA have been shown to bind specific anionic lipids and their lipid binding capacity is strongly linked to their sensitising effect to aminoglycosides.\n​This thesis presents the exploration of the connections these three proteins have to each other and their other binding partners by optical and electron microscopy in order to elucidate how their action leads to antibiotic sensitisation and what role their connection to the cell membrane and acid stress might play in this regard. It is shown that LdcI prefers to localise to the cell periphery to efficiently counteract acid stress and that mutations of its active site lead to large domain movements which might play a crucial role in its enzymatic activity. Furthermore\, an investigation of liposome decoration by RavA and ViaA is presented\, demonstrating the effect they have on membrane shape. In addition\, the first cryo-EM structure of ViaA is presented using helical repeat proteins to stabilise the protein. Finally\, predictions of RavA and ViaA protein-protein interactions in the inner E. coli membrane reveal possible functional targets of the proteins and the implications of these new possible avenues for action are discussed with regard of the microscopy investigations.\n\n—\n​​\n\n\nLes séminaires et soutenances sont ouverts à tous\, notez toutefois que l’accès au campus EPN nécessite un avis de rendez-vous. Merci de remplir ce formulaire  et de l’adresser\, plus de 48h à l’avance\, à ce contact. Pensez à vous munir d’une pièce d’identité le jour de votre visite.
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-moritz-kirchner-irig-ibs/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260424T110000
DTEND;TZID=Europe/Paris:20260424T120000
DTSTAMP:20260613T182531
CREATED:20260402T150508Z
LAST-MODIFIED:20260402T150513Z
UID:10000116-1777028400-1777032000@sfp-alpes.fr
SUMMARY:Mikhail ELTSOV (Institut de Génétique et de Biologie Moléculaire et Cellulaire\, Illkirch)
DESCRIPTION:Seeing chromatin in situ : advances and challenges of human and machine vision\nRésumé : \nUsing cryo-electron tomography of vitreous sections\, we directly visualized nucleosomes and linker DNA trajectories in situ within flash frozen Drosophila embryos. Measurements of linker length and curvature revealed an irregular zigzag pattern of chromatin folding characterized by relatively limited linker bending. In favorable orientations\, individual nucleosome particles and their structural variants could be identified without the need for structural averaging. Moreover\, we detected particles containing a variable number of DNA gyres\, ranging from fewer than one to up to three\, resembling previously proposed non-octameric nucleosome-like particles. \nTo place these structural observations in the context of functional chromatin organization\, we are developing computational approaches for nucleosome identification in cellular tomograms. We believe that our approach\, Template Learning\, based on training deep-learning networks on synthetic tomographic data\, can provide a general framework for detecting small macromolecular complexes in crowded cellular environments. \n— \nHôte : Irina Gutsche (IBS/MICA)
URL:https://sfp-alpes.fr/event/mikhail-eltsov-institut-de-genetique-et-de-biologie-moleculaire-et-cellulaire-illkirch/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IBS":MAILTO:ibs.seminaires@ibs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260504T110000
DTEND;TZID=Europe/Paris:20260504T120000
DTSTAMP:20260613T182531
CREATED:20260430T115259Z
LAST-MODIFIED:20260430T115259Z
UID:10000137-1777892400-1777896000@sfp-alpes.fr
SUMMARY:Giulio FACCHINI (Laboratoire Matière et Systèmes Complexes\, Paris)
DESCRIPTION:Deciphering the origin of saddle-shape geometry in the microstructure of echinoderms skeleton\nRésumé : \nThe microstructure of echinoderms skeleton\, like sea stars and sea urchins\, is an impressive example of self-organization and complexity. This structure called stereom is a porous meshwork\, made of calcite\, whose surface is saddle-shaped\, and remind of minimal surfaces. Minimal surfaces have intrigued scientists for centuries\, as they can spontaneously emerge from minimizing interfacial energy like surface tension. Several studies have addressed the morphogenesis of the stereom\, in sea urchins and other echinoderms\, showing that it forms via the addition of tiny mineral bids at the tip of small skeletal elements that successively branch and bridge to form a complex network. Yet\, a global\, mechanistic\, comprehension of how biomineralizing cells control preferential deposition is still lacking. \nDuring the seminar I will present a recent work1 on the morphogenesis of the particular stereom geometry observed in the sea star P. nodosus. Here\, the stereom can take the form of a diamond Triply Periodic Minimal Surface (TPMS) which confer it specific mechanical properties. Using different marking protocols\, we provide the first experimental insight in the formation of the diamond TPMS stereom\, and show that the formation of such a highly ordered structure relies on a precise and timely coordination of the branching and bridging episodes. Moreover\, we provide experimental evidences of an organic precursor made of F – actin fibers exhibiting saddle-shape geometry. We hypothesise that such a fibers template may self-organise under mechanical tension\, thus explaining the peculiar curvature signature of the final structure. Finally\, I will present some ongoing experimental work performed on sea urchins\, showing that the same morphogenetic mechanism could be shared across very different species. \nContact : emmanuel.siefert@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/giulio-facchini-laboratoire-matiere-et-systemes-complexes-paris/
LOCATION:LiPhy – Salle de conférence\, LiPhy 140 avenue de la Physique\, St Martin d'Hères\, 38402\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260506T110000
DTEND;TZID=Europe/Paris:20260506T120000
DTSTAMP:20260613T182531
CREATED:20260430T140156Z
LAST-MODIFIED:20260430T140721Z
UID:10000144-1778065200-1778068800@sfp-alpes.fr
SUMMARY:Tiffany HO (Lab of Prof Brian Wilson at the Princess Margaret Cancer Center\, Toronto\, Canada)
DESCRIPTION:Redefining photodynamic therapy beyond local : Nanoparticle-enabled photodynamic-immune stimulation for treatment of hot and cold cancers\nRésumé : \nPhotodynamic therapy (PDT) is a cancer-treatment modality that\, under the appropriate treatment parameters\, can induce immunogenic tumor cell death and stimulate anti-tumor immunity (photodynamic immune stimulation\, PDIS). This has the potential to prime adaptive immune responses capable of targeting distant\, untreated lesions\, as well as eradicating primary treated tumor. The clinical impact of PDT has been limited by conventional photosensitizers\, which often exhibit poor tumor selectivity and insufficient immune activation. Nanomedicine-based photosensitizer platforms offer a promising strategy to overcome such limitations. Porphysomes (PS)\, a class of all-organic\, multifunctional porphyrin-lipid nanoparticles currently in Phase I clinical trials for positron emission tomography (PET) imaging of metastatic gynecological cancers\, represent one such platform. \nThis seminar will focus on our work investigating PS-PDIS to drive systemic anti-tumor immunity across tumor models of different immunogenicity\, including immunologically “hot” colorectal (CT26) tumors and “cold” melanoma (B16F10) and ovarian (ID8) tumors. The findings establish a strategy to expand PDT beyond localized tumor ablation toward systemic disease control\, including prevention of recurrence and metastasis in cold tumors typically resistant to conventional immunotherapies. The seminar will also highlight ongoing efforts to develop gold nanocluster-based platforms for both light- and radiation-mediated immune stimulation in pancreatic cancer\, further expanding the scope of nanomaterial-enabled photodynamic and radiodynamic immune stimulation. \nThis work was supported by the Terry Fox Research Institute (PPG 1137) and the Government of Canada’s New Frontiers in Research Fund (NFRF) (#NFRFT-2020-00573). » \n_ \nContact : anne-laure.bulin@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/tiffany-ho-lab-of-prof-brian-wilson-at-the-princess-margaret-cancer-center-toronto-canada/
LOCATION:IAB – Salle de séminaire\, IAB Site Santé - Allée des Alpes\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IAB":MAILTO:appaixfl@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260506T113000
DTEND;TZID=Europe/Paris:20260506T123000
DTSTAMP:20260613T182531
CREATED:20260430T115832Z
LAST-MODIFIED:20260430T120458Z
UID:10000138-1778067000-1778070600@sfp-alpes.fr
SUMMARY:Adeline LACROIX (Centre for Addiction and Mental Health\, Toronto\, Canada)
DESCRIPTION:Towards an Understanding of Sex Differences in Socio-Emotional Processing in Autism\nRésumé : \nAutism is characterized by persistent difficulties in social interaction and social cognition. These difficulties are partly related to atypical processing of socio-emotional signals\, including emotional facial expressions. Although core autistic characteristics are observed in both males and females\, increasing evidence suggests that autistic females often show a more subtle socio-emotional profile\, marked by greater attention to social stimuli and more typical-appearing social behavior. However\, this profile remains insufficiently characterized\, and the underlying neurobiological mechanisms are still poorly understood.\n\nGiven the central role of face processing in social cognition\, we conducted a series of behavioral and EEG studies to investigate sex differences in autism during face processing at different stages of attentional processing. Our results reveal sex-related differences in autism from early stages of face processing\, with autistic females showing an intermediate profile between autistic males and non-autistic females. Together\, these findings indicate that aggregating males and females may obscure meaningful neurocognitive differences in socio-emotional processing and highlight the need for sex-informed experimental designs and theoretical frameworks in autism research. They further suggest that early differences in socio-emotional processing may contribute to the subtler phenotypic presentation of autism in females.\n_\nContact : michael.pereira@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/adeline-lacroix-centre-for-addiction-and-mental-health-toronto-canada/
LOCATION:GIN – Amphi Serge Kampf\, Grenoble Institut des Neurosciences (GIN) Bât. Edmond J. Safra\, Chemin Fortune Ferrini CHU\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260507T130000
DTEND;TZID=Europe/Paris:20260507T140000
DTSTAMP:20260613T182531
CREATED:20260424T125214Z
LAST-MODIFIED:20260424T125214Z
UID:10000133-1778158800-1778162400@sfp-alpes.fr
SUMMARY:Pierre GARCIA (LCB\, Marseille)
DESCRIPTION:When life plays LEGOs : Ancient evolution and extreme diversity of homologous oxidoreductases involved in energy production\n_ \nContact : lucie.lamothe@univ-grenoble-alpes.fr \n 
URL:https://sfp-alpes.fr/event/pierre-garcia-lcb-marseille/
LOCATION:IMAG – Salle de Réunion\, 150 place du Torrent\, St Martin d’Hères\, 38400\, France
CATEGORIES:Séminaire
ORGANIZER;CN="TIMC - IMAG":MAILTO:lucie.lamothe@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260507T140000
DTEND;TZID=Europe/Paris:20260507T150000
DTSTAMP:20260613T182531
CREATED:20260430T122734Z
LAST-MODIFIED:20260430T122840Z
UID:10000140-1778162400-1778166000@sfp-alpes.fr
SUMMARY:Amaury PATIN (Expert in Organic Chemistry\, Nestlé Institute of Food Safety & Analytical Sciences (NIFSAS)\, Lausanne\, Suisse)
DESCRIPTION:The Journey of an Organic Chemist : What Organic Chemistry trains you for— From Drug Discovery toFood (Safety)\nRésumé : \nOrganic chemistry plays a central but often under-recognized role in addressing complex industrial challenges that extend well beyond molecule synthesis. In this seminar\, I will describe how training in organic chemistry can be leveraged across multiple industrial domains\, based on my career spanning academia\, biotech\, and industrial research within a multinational food company. \nThe talk presents a personal career journey illustrating the diversity of opportunities available to organic chemists. Starting from doctoral and postdoctoral research in organic chemistry\, I moved into medicinal chemistry within a biotech startup before joining Nestlé Research\, where organic chemistry became a central tool for addressing challenges in ingredient innovation and food safety. \nThrough selected case studies\, I will show how the same fundamental chemical concepts — reactivity\, molecular structure\, metabolism — can be applied in very different contexts\, from drug discovery to food safety. The seminar will also address the evolution from hands-on scientist to project manager and group leader\, highlighting the importance of soft skills such as communication\, interdisciplinarity\, and leadership. \n_ \nContact : sandrine.py@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/amaury-patin-expert-in-organic-chemistry-nestle-institute-of-food-safety-analytical-sciences-nifsas-lausanne-suisse/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260521T100000
DTEND;TZID=Europe/Paris:20260521T110000
DTSTAMP:20260613T182531
CREATED:20260430T123218Z
LAST-MODIFIED:20260430T123713Z
UID:10000141-1779357600-1779361200@sfp-alpes.fr
SUMMARY:Chloé GRAZON (Laboratoire de Chimie des Polymères Organiques (LCPO)\, Université de Bordeaux / CNRS / Bordeaux INP\, Pessac)
DESCRIPTION:Luminescent nanoparticles as bright nanotools for biosensing & bioimaging\nRésumé : à venir \n_ \nContact : galina.dubacheva@univ-grenoble-alpes.fr \n 
URL:https://sfp-alpes.fr/event/chloe-grazon-laboratoire-de-chimie-des-polymeres-organiques-lcpo-universite-de-bordeaux-cnrs-bordeaux-inp-pessac/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260521T113000
DTEND;TZID=Europe/Paris:20260521T123000
DTSTAMP:20260613T182531
CREATED:20260521T085300Z
LAST-MODIFIED:20260521T085300Z
UID:10000152-1779363000-1779366600@sfp-alpes.fr
SUMMARY:Claudie LEMERCIER (Responsable "Associations de patients\, Société et Recherche »\, Délégation Inserm AURA)
DESCRIPTION:Les Associations de Patients et la Recherche\nRésumé : \nLes associations de patients sont un maillon indispensable de notre systèm de santé. Si le financement de projets ou de bourses sont bien connus des chercheurs\, les associations de patients agissent à bien d’autres niveaux qui restent largement méconnus des scientifiques. \nVenez découvrir les actions menées depuis dix ans à la délégation Inserm AuRA pour rapprocher les chercheurs des associations de patients mais également de grand public\, et donner davantage de visibilité aux travaux réalisés dans les laboratoires. La recherche participative en santé sera également abordée. \n_ \nContact : emmanuel.barbier@univ-grenoble-alpes.fr \n  \n  \n 
URL:https://sfp-alpes.fr/event/claudie-lemercier-responsable-associations-de-patients-societe-et-recherche-delegation-inserm-aura/
LOCATION:GIN – Amphi Serge Kampf\, Grenoble Institut des Neurosciences (GIN) Bât. Edmond J. Safra\, Chemin Fortune Ferrini CHU\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260521T133000
DTEND;TZID=Europe/Paris:20260521T163000
DTSTAMP:20260613T182531
CREATED:20260430T124859Z
LAST-MODIFIED:20260430T124956Z
UID:10000142-1779370200-1779381000@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Furhan ABDUL-REZAK (DCM (équipe I2BM) - IAB)
DESCRIPTION:Selective Conjugation of Gold Nanoclusters with Macromolecules: From Functionalization to Assembly\nRésumé : à venir \n_ \nContact : nathalie.camerino@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-furhan-abdul-rezak-dcm-equipe-i2bm-iab/
LOCATION:IAB – Salle de séminaire\, IAB Site Santé - Allée des Alpes\, La Tronche\, 38700\, France
CATEGORIES:Soutenance,Soutenance de Thèse
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260526T110000
DTEND;TZID=Europe/Paris:20260526T120000
DTSTAMP:20260613T182531
CREATED:20260424T075655Z
LAST-MODIFIED:20260424T075655Z
UID:10000126-1779793200-1779796800@sfp-alpes.fr
SUMMARY:Mark GLOVER (Department of Biochemistry\, University of Alberta\, Edmonton\, Canada)
DESCRIPTION:Mechanism of sRNA recognition and regulation by FinO RNA chaperones\nRésumé : \nThe FinO family of RNA chaperones regulate sRNA function throughout gram negative bacteria. Many of the best characterized family members bind to rho-independent transcription termination structures at the 3’ ends of sRNAs and mediate pairing of the sRNA with their mRNA targets. The crystal structure of the FinO domain of the Legionella pneumophila chaperone RocC bound to its sRNA target reveals a novel interaction that recognizes both the stem and the 3’ end of the terminator structure. The structure suggests a mechanism by which different FinO proteins can selectively bind RNAs with different 3’ tail lengths\, which is likely conserved throughout the FinO family. Biochemical and in vivo studies indicate that intrinsically disordered regions adjacent to the FinO domain are also essential for sRNA regulation\, by remodeling RNA structure to facilitate RNA-RNA association. \n__ \nHôte : Dr Nicolas Coquelle (IBS/Groupe Dynamique et Cinétique des processus moléculaires) \nRappel : L’accès au campus EPN nécessite un avis de rendez-vous. A cet effet merci d’adresser votre demande à ibs.seminaires@ibs.fr (au moins 48h à l’avance).
URL:https://sfp-alpes.fr/event/mark-glover-department-of-biochemistry-university-of-alberta-edmonton-canada/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260528T130000
DTEND;TZID=Europe/Paris:20260528T140000
DTSTAMP:20260613T182532
CREATED:20260507T093329Z
LAST-MODIFIED:20260521T094049Z
UID:10000146-1779973200-1779976800@sfp-alpes.fr
SUMMARY:Vincent LACROIX  (LBBE - Lyon)
DESCRIPTION:Repeats : the dark side of transcriptome assembly\n_ \nContact : lucie.lamothe@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/vincent-lacroix-lbbe-lyon/
LOCATION:IMAG – Salle de Réunion\, 150 place du Torrent\, St Martin d’Hères\, 38400\, France
CATEGORIES:Séminaire
ORGANIZER;CN="TIMC - IMAG":MAILTO:lucie.lamothe@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260528T140000
DTEND;TZID=Europe/Paris:20260528T150000
DTSTAMP:20260613T182532
CREATED:20260430T130321Z
LAST-MODIFIED:20260430T130828Z
UID:10000143-1779976800-1779980400@sfp-alpes.fr
SUMMARY:Charles McCRORY (Chemistry and Macromolecular Science and Engineering - University of Michigan\, USA)
DESCRIPTION:Breaking Scaling Relationships in Molecular Electrocatalysts for the CO2 Reduction Reaction\nProfesseur invité UGA du 15/05 au 15/06/2026 \nRésumé : \nFor molecular electrocatalysts\, beneficial decreases in effective overpotential are typically correlated with detrimental decrease in catalytic activity. This scaling relationship arises when both effective overpotential and kinetic reactivity scale with metal site nucleophilicity. Our research strategy is to break typical molecular scaling  relationships by designing molecular electrocatalysts with redox-active ligands where the catalytic reaction is initiated by redox activation of the ligand. These systems decouple metal site nucleophilicity from effective overpotential\, thus allowing us to break the correlation between catalyst reactivity and effective overpotential. \nIn this talk\, we will discuss how incorporating electronic substituents onto the redox-active ligand structure of Co(pyridyldiimine) complexes facilitates ligand reduction and leads to an inverse molecular scaling relationship for electrocatalytic CO2 reduction. We will explore the strategy of incorporating cationic charges into the complex as a means of breaking and inverting scaling relationships both through the incorporation of charged substituents into the ligand scaffold and through construction of homo- and heterobimetallic Co-Co and Co-Zn complexes. We will also discuss whether the activity enhancement from these cationic substituents is best described as\nthrough-space electrostatic stabilization of reactive intermediates\, or through-bond inductive effects related to the stabilization of the catalytic intermediates. Finally\, we will explore how these complexes operate for CO2 reduction and other electrocatalytic reductions when incorporated into larger coordination polymers and macromolecular scaffolds. \n_ \nContact : cyrille.costentin@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/charles-mccrory-chemistry-and-macromolecular-science-and-engineering-university-of-michigan-usa/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260602T110000
DTEND;TZID=Europe/Paris:20260602T120000
DTSTAMP:20260613T182532
CREATED:20260528T153318Z
LAST-MODIFIED:20260528T153318Z
UID:10000163-1780398000-1780401600@sfp-alpes.fr
SUMMARY:Damien GREGOIRE (IGMM\, Montpellier\, France)
DESCRIPTION:In vivo modeling of tumor heterogeneity in hepatocellular carcinoma\nRésumé : \nOur research aims at a better understanding of how various combinations of oncogenic events drive tumorigenesis. We address two major questions in cancer biology\, within the context of inter-tumoral heterogeneity: (1) what mechanisms underlie oncogenic cooperation in shaping of the tumor cell fate\, and (2)\, how does the genetic identity of a tumor influence its interactions with the microenvironment ? \nWe explore these questions in the context of hepatocellular carcinoma (HCC)\, the most common primary liver cancer. Our approach combines functional studies with advanced preclinical mouse models\, particularly in vivo hepatocyte transfection via hydrodynamic gene transfer. We focus our investigations on tumors driven by either FGF19 overexpression or a spectrum of p53 mutations. \nIn this talk at IAB\, I will present recent findings on these two distinct families of hepatic tumors. Our ultimate goal is to elucidate how the genetic profile of HCC shapes the tumor cell phenotype\, its interactions with the tumor microenvironment—especially immune cells—and its response to treatments. \n_ \nContact : thomas.decaens@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/damien-gregoire-igmm-montpellier-france/
LOCATION:IAB – Salle de séminaire\, IAB Site Santé - Allée des Alpes\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IAB":MAILTO:appaixfl@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260604T113000
DTEND;TZID=Europe/Paris:20260604T123000
DTSTAMP:20260613T182532
CREATED:20260528T151721Z
LAST-MODIFIED:20260528T151721Z
UID:10000161-1780572600-1780576200@sfp-alpes.fr
SUMMARY:Timothée PROIX (ETH Zurich)
DESCRIPTION:Neural manifolds for speech processing\nRésumé : \nSpeech comprehension requires the brain to represent and combine phonetic\, lexical\, and semantic information across a linguistic hierarchy. Yet how neuronal populations implement these representations and compositions remains unclear. In this talk\, I will show how the framework of neural manifolds offers a powerful lens for this question\, combining intracranial recordings in the human cortex with population-level analyses and computational modeling.\nI will show that linguistic features are encoded as distinct trajectories on low-dimensional manifolds\, which can be resolved analytically by fitting recurrent neural networks directly to the neural data. I will then discuss how these trajectory-based representations are combined across levels\, from the composition of phonetic features into syllables\, to the interactions between phonetic and semantic representations. Together\, these perspectives point toward a population-level mechanism for the representation and composition of speech processing. \nContact : michael.pereira@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/timothee-proix-eth-zurich/
LOCATION:GIN – Amphi Serge Kampf\, Grenoble Institut des Neurosciences (GIN) Bât. Edmond J. Safra\, Chemin Fortune Ferrini CHU\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260604T140000
DTEND;TZID=Europe/Paris:20260604T150000
DTSTAMP:20260613T182532
CREATED:20260529T150404Z
LAST-MODIFIED:20260529T150404Z
UID:10000176-1780581600-1780585200@sfp-alpes.fr
SUMMARY:Aurélien DE LA TORRE (ICMMO\, CNRS/Université Paris-Saclay)
DESCRIPTION:Designing cycloadditions to enable total synthesis\nRésumé : \nAsymmetric catalysis is a key topic in organic synthesis\, as it allows the formation of new bonds while controlling stereogenic centers\, which are inherent to natural products and biologically active substances. On the other hand\, dual catalysis is an efficient approach to operate multiple chemical operations through a one-pot process. In this presentation\, we will discuss our recent developments in asymmetric catalysis and dual catalysis\, as well as their application to a concrete total synthesis\nproblem. \n_ \nContact : adrien.quintard@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/aurelien-de-la-torre-icmmo-cnrs-universite-paris-saclay/
LOCATION:DCM – Salle C209\, DCM - Bât Chimie Recherche 301 rue de la Chimie\, St Martin d'Hères\, 38400\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260608T140000
DTEND;TZID=Europe/Paris:20260608T160000
DTSTAMP:20260613T182532
CREATED:20260529T142409Z
LAST-MODIFIED:20260529T142409Z
UID:10000171-1780927200-1780934400@sfp-alpes.fr
SUMMARY:Soutenance de Thèse de Antoine CURÉ (IRIG / Symmes)
DESCRIPTION:Vers des copolymères à blocs donneur-accepteur π-conjugués à structure et composition précisément définies : caractérisation avancée et stratégies de synthèse\nRésumé : \nDans un contexte mondial de crise énergétique et de raréfaction des ressources fossiles\, la transition vers les énergies renouvelables constitue un enjeu majeur. Parmi elles\, l’énergie photovoltaïque occupe une place importante. Cependant\, alors que les panneaux solaires au silicium approchent de leurs limites en rendement et en coûts de production\, l’émergence de solutions complémentaires devient nécessaire. Les cellules solaires organiques constituent une alternative intéressante\, avec des rendements atteignant 21 % dans des conditions standard en laboratoire en 2026. Elles présentent également de bonnes performances en lumière diffuse et offrent un potentiel de production à faible coût de dispositifs flexibles et recyclables. Toutefois\, leur stabilité à long terme reste un obstacle à leur industrialisation. La couche active\, composée d’un donneur (polymère) et d’un accepteur (petite molécule)\, subit au cours du temps une séparation de phase qui dégrade les performances. Malgré les progrès réalisés avec les accepteurs polymères\, la viabilité à long terme de ces dispositifs reste à démontrer. ​​​​\n​ Depuis le début des années 2020\, les matériaux monocomposants sont sérieusement envisagés comme une solution à ces problèmes d’instabilité. Contrairement aux mélanges tout-polymères\, ils reposent sur des copolymères à blocs reliant de manière covalente les segments donneurs et accepteurs\, limitant leur mobilité relative et la ségrégation de phase. Si les premières études rapportent des résultats encourageants\, leur structure et leurs propriétés thermiques restent encore mal comprises. La synthèse et l’étude approfondie de ces systèmes constituent l’objectif de cette thèse. ​​​​\nAprès un premier chapitre introductif\, le deuxième chapitre est consacré à l’étude de deux matériaux modèles : le PTQ10\, polymère donneur parmi les plus performants de la littérature\, et le PIDTe\, un polymère accepteur de structure proche de systèmes connus mais dont la synthèse est simplifiée. Ce travail valide leur pertinence comme système modèle et permet de mettre en place les méthodes de caractérisation utilisées dans la suite de la thèse. Le troisième chapitre explore l’analyse structurale des monocomposants par résonance magnétique nucléaire (RMN). L’utilisation de molécules modèles permet d’identifier les signaux caractéristiques des liaisons entre blocs donneurs et accepteurs et d’estimer le nombre moyen de jonctions dans les chaînes de copolymères. Une approche complémentaire par RMN à diffusion ordonnée (DOSY) est également évaluée afin d’estimer la composition des matériaux. Le quatrième chapitre s’intéresse aux propriétés thermiques des monocomposants. Une méthode basée sur la spectroscopie UV-visible est développée pour suivre les évolutions morphologiques à l’échelle nanométrique à l’état solide. Associée à la diffraction des rayons X en incidence rasante (GIWAXS)\, à la microscopie à force atomique (AFM) et à la calorimétrie différentielle à balayage rapide (flash DSC)\, elle permet de comparer la stabilité thermique des monocomposants à celle des mélanges tout-polymères. ​​​​\nEnfin\, le cinquième chapitre vise à synthétiser des monocomposants de structure mieux définie. La modification du monomère du PTQ10 permet d’obtenir un polymère possédant une fonction réactive terminale unique et une structure régiorégulière. Cette régiorégularité améliore l’organisation des chaînes latérales mais semble perturber celle du cœur π-conjugué\, affectant les propriétés optoélectroniques. Différentes stratégies de synthèse de copolymères di- et tri-blocs sont ensuite développées\, ouvrant de nouvelles perspectives. ​​​​\nEn conclusion\, cette thèse contribue à une meilleure compréhension des matériaux monocomposants pour les cellules solaires organiques et propose de nouvelles approches d’analyse et de synthèse pour des dispositifs plus stables et performants. ​​​​ \n_ \nContact : odile.rossignol@cea.fr
URL:https://sfp-alpes.fr/event/soutenance-de-these-de-antoine-cure-irig-symmes/
LOCATION:GreEN-ER – Amphi 2A003\, 21 avenue des Martyrs\, Grenoble\, 38000\, France
CATEGORIES:Soutenance,Soutenance de Thèse
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260609T140000
DTEND;TZID=Europe/Paris:20260609T150000
DTSTAMP:20260613T182532
CREATED:20260529T143536Z
LAST-MODIFIED:20260529T145613Z
UID:10000173-1781013600-1781017200@sfp-alpes.fr
SUMMARY:Soutenance HDR de Tristan WAGNER (IRIG / IBS)
DESCRIPTION:Characterization of native enzymes to understand how anaerobic microbes impact biogeochemical cycles\nRésumé : \nMicrobes are actors of the biogeochemical cycles\, transforming gases\, minerals\, and biological matter through enzymatic reaction chains. Among them\, anaerobic archaea\, namely methanogens and methanotrophs\, play a key role in converting planetary carbon\, nitrogen\, and sulfur\, impacting the biosphere and providing green sustainable solutions for our modern society. The last fourteen years of my career were devoted to understanding the molecular basis of these microbial transformations\, such as methane production or degradation\, CO2 and carbon monoxide conversion to biofuels\, N2 fixation\, and sulfur cycling. Since these enzymes harbor O2-sensitive complicated metallocofactors\, most of my work relies on native protein purification from the microbes themselves under strict O2 exclusion. After a brief presentation of my career and PhD project\, the presented work summarizes my most renowned breakthrough regarding the elucidation of molecular tricks in carbon\, nitrogen\, and sulfur metabolisms in methane-generating microbes\, including their regulatory networks. Then\, the latest research led by my group is introduced with : (i) how methanogens munch on methylated substrates such as methanol and lignin-degradation products\, (ii) how an industrial bacterium turns waste gases into biofuels\, (iii) the study of a microbial consortia “that burn” methane and ethane without oxygen via a native approach. Finally\, I will present the features of my past group and my future laboratory. ​​ \nL’accès au campus EPN nécessite un avis de rendez-vous. Merci d’adresser votre demande à ibs.seminaires@ibs.fr au moins 48h à l’avance. \nN’oubliez pas de vous munir d’une pièce d’identité.​
URL:https://sfp-alpes.fr/event/tristan-wagner-irig-ibs/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Soutenance,Soutenance HDR
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260611T113000
DTEND;TZID=Europe/Paris:20260611T123000
DTSTAMP:20260613T182532
CREATED:20260605T140154Z
LAST-MODIFIED:20260605T140154Z
UID:10000192-1781177400-1781181000@sfp-alpes.fr
SUMMARY:Kirill NOURSKI (University of Iowa\, USA)
DESCRIPTION:What the insula hears and does : Insights from human intracranial electrophysiology\nRésumé : \nThe human insula is known to be involved in auditory processing\, though its detailed response properties remain elusive. Intracranial recordings in human neurosurgical patients provide a unique opportunity to characterize the functional properties of the human insula with high spatiotemporal resolution. Local field potential recordings reveal that posterior insula (InsP) is characterized by larger broadband gamma (30-150 Hz) responses to monosyllabic words compared to anterior insula (InsA). Both subdivisions of the insula generate evoked responses to novel sounds. Single neurons within InsP and\, to a lesser extent\, InsA\, respond to simple sounds in the absence of a behavioral context. InsP and InsA share similar res9ng state functional connectivity profiles with limbic structures. InsP is more closely linked to activity propagated from early auditory cortex\, while InsA is more tightly coupled with prefrontal\, anterior temporal regions and the amygdala. Clinical case studies identify language and music perception deficiencies associated with insula lesions. Finally\, single unit recordings during emergence from general anesthesia reveal a temporal dissociation between reactivation of limbic structures and the insula\, the laPer marking the transition to connected consciousness and the capacity to act on commands. Together\, these results begin to characterize the insula’s place in the auditory hierarchy\, with implications ranging from sensory processing to conscious awareness of our surroundings. \n_ \nContact : julien.bastin@univ-grenoble-alpes.fr \n  \n 
URL:https://sfp-alpes.fr/event/kirill-nourski-university-of-iowa-usa/
LOCATION:GIN – Amphi Serge Kampf\, Grenoble Institut des Neurosciences (GIN) Bât. Edmond J. Safra\, Chemin Fortune Ferrini CHU\, La Tronche\, 38700\, France
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260611T130000
DTEND;TZID=Europe/Paris:20260611T140000
DTSTAMP:20260613T182532
CREATED:20260507T093550Z
LAST-MODIFIED:20260604T104156Z
UID:10000147-1781182800-1781186400@sfp-alpes.fr
SUMMARY:Anne LOPES (I2BC - Gif sur Yvette)
DESCRIPTION:Emergence of microproteins and de novo genes from noncoding DNA\n_ \nContact : lucie.lamothe@univ-grenoble-alpes.fr
URL:https://sfp-alpes.fr/event/anne-lopes-i2bc-gif-sur-yvette/
LOCATION:IMAG – Salle de Réunion\, 150 place du Torrent\, St Martin d’Hères\, 38400\, France
CATEGORIES:Séminaire
ORGANIZER;CN="TIMC - IMAG":MAILTO:lucie.lamothe@univ-grenoble-alpes.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260612T110000
DTEND;TZID=Europe/Paris:20260612T120000
DTSTAMP:20260613T182532
CREATED:20260604T142423Z
LAST-MODIFIED:20260604T142423Z
UID:10000187-1781262000-1781265600@sfp-alpes.fr
SUMMARY:Alexandra COLIN (CEA-Irig/LPCV)
DESCRIPTION:Dynamics and Scaling of Competitive Actin Architectures\nRésumé : \n\nCells constantly experience environmental changes requiring a fast adaptation of their different actin structures. However\, the mechanisms governing the size and dynamics of these multiple actin structures remain unknown. Decoupling the various parameters that would provide a complete understanding of these mechanisms is very complicated in a cellular context. This is why we have developed a bottom-up approach to identify the key molecular mechanisms that determine the size and coexistence of multiple competing actin architectures. We used a reconstituted system consisting of purified proteins and substrates to localize actin polymerization in microwells\, enabling us to work with a limited number of components. With this system\, we reconstituted several dynamic actin architectures\, competing for a limited pool of protein\, over a period of multiple hours. This allowed us to gain key insights into physiological functions related to actin turnover. I will show how we used this system to study the limits of scaling in dynamic structures\, as well as the limits of coexistence in actin networks under resource-limited conditions. Finally\, I will show how we can recapitulate these results in a complementary cellular system\, in which we have demonstrated that an increase in spreading area leads to a decrease in overall turnover\, due to a predominance of structures with low turnover.​​​​​\n​\n\n\n\nLes séminaires et soutenances sont ouverts à tous\, notez toutefois que l’accès au campus EPN nécessite un avis de rendez-vous. Merci de remplir ce formulaire  et de l’adresser\, plus de 48h à l’avance\, à ce contact.\nPensez à vous munir d’une pièce d’identité le jour de votre visite.
URL:https://sfp-alpes.fr/event/alexandra-colin-cea-irig-lpcv/
LOCATION:IBS – Salle des séminaires\, IBS 71 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260615T110000
DTEND;TZID=Europe/Paris:20260615T120000
DTSTAMP:20260613T182532
CREATED:20260529T122925Z
LAST-MODIFIED:20260529T122925Z
UID:10000168-1781521200-1781524800@sfp-alpes.fr
SUMMARY:Richard HOLZ (School of Mines\, Golden\, Colorado\, USA)
DESCRIPTION:Targeting Iron-Sulfur Cluster Biosynthesis in Staphylococcus aureus : Mechanistic Insights into the SUF Pathway\n_ \nL’accès au CEA Grenoble nécessite un avis de rendez-vous. Merci d’envoyer la copie de votre pièce d’identité à sandrine.ollagnier@cea.fr\, avant le 08 juin 2026.\nPensez à vous munir de cette pièce d’identité le jour de votre visite. \n  \n 
URL:https://sfp-alpes.fr/event/richard-holz-school-of-mines-golden-colorado-usa/
LOCATION:CEA – Salle de séminaire IRIG (104 – bâtiment C3)\, 17\, avenue des Martyrs\, Grenoble\, 38000\, France
CATEGORIES:Séminaire
ORGANIZER;CN="IRIG - CEA":MAILTO:odile.rossignol@cea.fr
END:VEVENT
END:VCALENDAR