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3 results on '"Région Bourgogne Franche-Comté"'

1. The Coble Quadric

Author

Benedetti, Vladimiro, Faenzi, Daniele, Bolognesi, Michele, Manivel, L, Institut de Mathématiques de Bourgogne [Dijon] (IMB), Université de Bourgogne (UB)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS), Institut Montpelliérain Alexander Grothendieck (IMAG), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Institut de Mathématiques de Toulouse UMR5219 (IMT), Université Toulouse Capitole (UT Capitole), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université Toulouse - Jean Jaurès (UT2J), Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS), Feder Bourgogne, Région Bourgogne-Franche-Comté, ANR-20-CE40-0023,FanoHK,Des variétés de Fano aux hyperkählériennes : géométrie et catégories dérivées(2020), ANR-21-CE40-0017,BRIDGES,Interactions Brésil-France en théorie de jauge, structures extrémales et stabilité(2021), ANR-17-EURE-0002,EIPHI,Ingénierie et Innovation par les sciences physiques, les savoir-faire technologiques et l'interdisciplinarité(2017), Benedetti, Vladimiro, Des variétés de Fano aux hyperkählériennes : géométrie et catégories dérivées - - FanoHK2020 - ANR-20-CE40-0023 - AAPG2020 - VALID, Interactions Brésil-France en théorie de jauge, structures extrémales et stabilité - - BRIDGES2021 - ANR-21-CE40-0017 - AAPG2021 - VALID, and Ingénierie et Innovation par les sciences physiques, les savoir-faire technologiques et l'interdisciplinarité - - EIPHI2017 - ANR-17-EURE-0002 - EURE - VALID

Subjects
Coble hypersurfaces, Mathematics - Algebraic Geometry, degeneracy loci, [MATH.MATH-AG] Mathematics [math]/Algebraic Geometry [math.AG], FOS: Mathematics, 14h60, 22E46, Moduli spaces of stable bundles, subvarieties of Grassmannians, [MATH.MATH-AG]Mathematics [math]/Algebraic Geometry [math.AG], Hecke lines, self-dual hypersurfaces, Algebraic Geometry (math.AG)
Abstract

Given a smooth genus three curve $C$, the moduli space of rank two stable vector bundles on C with trivial determinant embeds in $\mathbb{P}^8$ as a hypersurface whose singular locus is the Kummer threefold of $C$; this hypersurface is the Coble quartic. Gruson, Sam and Weyman realized that this quartic could be constructed from a general skew-symmetric fourform in eight variables. Using the lines contained in the quartic, we prove that a similar construction allows to recover SU$_C(2, L)$, the moduli space of rank two stable vector bundles on C with fixed determinant of odd degree L, as a subvariety of $G(2, 8)$. In fact, each point $p \in C$ defines a natural embedding of SU$_C(2, \mathcal{O}(p))$ in $G(2, 8)$. We show that, for the generic such embedding, there exists a unique quadratic section of the Grassmannian which is singular exactly along the image of SU$_C(2, \mathcal{O}(p))$, and thus deserves to be coined the Coble quadric of the pointed curve $(C, p)$.

Published
2023

2. Non thermal 2.45 GHz electromagnetic exposure causes rapid changes in Arabidopsis thaliana metabolism

Author

Alexis Porcher, Sébastien Girard, Pierre Bonnet, Raphaël Rouveure, Vincent Guérin, Françoise Paladian, Alain Vian, Institut de Recherche en Horticulture et Semences (IRHS), Université d'Angers (UA)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Rennes Angers, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Direction Régionale de l'Alimentation, de l'Agriculture et de la Forêt de la région Bourgogne-Franche-Comté (DRAAF BFC), Institut de Chimie de Clermont-Ferrand (ICCF), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne), Université Clermont Auvergne (UCA)-Université Clermont Auvergne (UCA), Technologies et systèmes d'information pour les agrosystèmes (UR TSCF), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Institut Pascal (IP), and Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA)-Institut national polytechnique Clermont Auvergne (INP Clermont Auvergne)

Subjects
Physiology, Non-thermal, Stress-marker genes, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Plant Science, Hydrogen peroxide, Agronomy and Crop Science, Electromagnetic exposure
Abstract

International audience; Numerous studies report different types of responses following exposure of plants to high frequency electromagnetic fields (HF-EMF). While this phenomenon is related to tissue heating in animals, the situation is much less straightforward in plants where metabolic changes seem to occur without tissue temperature increase. We have set up an exposure system allowing reliable measurements of tissue heating (using a reflectometric probe and thermal imaging) after a long exposure (30 min) to an electromagnetic field of 2.45 GHz transmitted through a horn antenna (about 100 V m−1 at the plant level). We did not observe any heating of the tissues, but we detected rapid increases (60 min) in the accumulation of transcripts of stress-related genes (TCH1 and ZAT12 transcription factor) or involved in ROS metabolism (RBOHF and APX1). At the same time, the amounts of hydrogen peroxide and dehydroascorbic acid increased while glutathione (reduced and oxidized forms), ascorbic acid, and lipid peroxidation remained stable. Therefore, our results unambiguously show that molecular and biochemical responses occur rapidly (within 60min) in plants after exposure to an electromagnetic field, in absence of tissue heating.

Published
2023
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3. Comprehensive mass spectrometry lipidomics of human biofluids and ocular tissues

Author

Glenda Vasku, Caroline Peltier, Zhiguo He, Gilles Thuret, Philippe Gain, Pierre-Henry Gabrielle, Niyazi Acar, Olivier Berdeaux, Centre des Sciences du Goût et de l'Alimentation [Dijon] (CSGA), Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Dijon, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Université Bourgogne Franche-Comté [COMUE] (UBFC), Plateforme Chemosens [Dijon], Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Université de Bourgogne (UB)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut Agro Dijon, Biologie, Ingénierie et Imagerie pour l'Ophtalmologie (BIIO), Université Jean Monnet - Saint-Étienne (UJM), Service d'Ophtalmologie (CHU de Dijon), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), This study was supported by : Ministère de l’Enseignement Supérieur, de la Recherche et de l'Innovation (MESRI), Région Bourgogne-Franche-Comté (BFC), Fonds européen de développement régional (FEDER), Laboratoire d’Excellence (LabEx) and Fondation VISO., and European Project: FEDER

Subjects
glycolipids, Cell Biology, Biochemistry, RPE/Choroid, Endocrinology, lipidomic analysis, eye/retina, erythrocytes, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, [SDV.MHEP.OS]Life Sciences [q-bio]/Human health and pathology/Sensory Organs, age-related macular degeneration, phospholipids, plasma, mass spectrometry
Abstract

International audience; Evaluating lipid profiles in human tissues and biofluids is critical in identifying lipid metabolites in dysregulated metabolic pathways. Due to various chemical characteristics, single-run lipid analysis has not yet been documented. Such approach is essential for analysing pathology-related lipid metabolites. Age-Related Macular Degeneration (AMD), the leading cause of vision loss in western countries, is emblematic of this limitation. Several studies have identified alterations in individual lipids, but the majority are based on targeted approaches. In this study, we analyzed and identified approximately 500 lipid species in human biofluids (plasma and erythrocytes) and ocular tissues (retina and retinal pigment epithelium) using the complementarity of hydrophilic interaction liquid chromatography (HILIC) and reversed-phase chromatography (RPC), coupled to high-resolution mass spectrometry (HRMS). For that, lipids were extracted from human eyeglobes and blood from 10 subjects and lipidomic analysis was carried out through analysis in HILIC and RPC, alternately. Furthermore, we illustrate the advantages and disadvantages of both techniques for lipid characterization. RPC showed greater sensitivity in hydrophobicity-based lipid separation, detecting diglycerides (DAG), triglycerides (TAG), cholesterol (Chol), and cholesterol esters (CEs), whereas no signal of these molecules was obtained in HILIC. However, due to coelution, RPC was less effective in separating polar lipids like phospholipids, which were separated effectively in HILIC in both ionization modes. The complementary nature of these analytical approaches was essential for the detection and identification of lipid classes/subclasses, which can then provide distinct insights into lipid metabolism, a determinant of the pathophysiology of several diseases involving lipids, notably AMD.

Published
2023
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