2,292 results on '"Leconte, A"'
Search Results
2. The indefinite proximal gradient method
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Leconte, Geoffroy and Orban, Dominique
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- 2024
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3. Mesoscopic transport in KSTAR plasmas: avalanches and the E × B staircase
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Choi, Minjun J, Kwon, Jaemin, Qi, Lei, Diamond, Patrick H, Hahm, Taik-Soo, Jhang, Hogun, Kim, Juhyung, Leconte, Michael, Kim, Hyun-Seok, Kang, Jisung, Park, Byoung-Ho, Chung, Jinil, Lee, Jaehyun, Kim, Minho, Yun, Gunsu S, Nam, YU, Kim, Jaewook, Ko, Won-Ha, Lee, Kyu-Dong, and Juhn, June-Woo
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Nuclear and Plasma Physics ,Physical Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Other Physical Sciences ,Fluids & Plasmas ,Nuclear and plasma physics - Abstract
Abstract: The self-organization is one of the most interesting phenomena in the non-equilibrium complex system, generating ordered structures of different sizes and durations. In tokamak plasmas, various self-organized phenomena have been reported, and two of them, coexisting in the near-marginal (interaction dominant) regime, are avalanches and the E × B staircase. Avalanches mean the ballistic flux propagation event through successive interactions as it propagates, and the E × B staircase means a globally ordered pattern of self-organized zonal flow layers. Various models have been suggested to understand their characteristics and relation, but experimental researches have been mostly limited to the demonstration of their existence. Here we report detailed analyses of their dynamics and statistics and explain their relation. Avalanches influence the formation and the width distribution of the E × B staircase, while the E × B staircase confines avalanches within its mesoscopic width until dissipated or penetrated. Our perspective to consider them the self-organization phenomena enhances our fundamental understanding of them as well as links our findings with the self-organization of mesoscopic structures in various complex systems.
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- 2024
4. Modeling Atmospheric Lines by the Exoplanet Community (MALBEC) Version 1.0: A CUISINES Radiative Transfer Intercomparison Project
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Villanueva, Geronimo L, Fauchez, Thomas J, Kofman, Vincent, Alei, Eleonora, Lee, Elspeth KH, Janin, Estelle, Himes, Michael D, Leconte, Jérémy, Leung, Michaela, Faggi, Sara, Mak, Mei Ting, Sergeev, Denis E, Kozakis, Thea, Manners, James, Mayne, Nathan, Schwieterman, Edward W, Howe, Alex R, and Batalha, Natasha
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Space Sciences ,Astronomical Sciences ,Physical Sciences ,Astronomical sciences ,Space sciences - Abstract
Abstract: Radiative transfer (RT) models are critical in the interpretation of exoplanetary spectra, in simulating exoplanet climates, and when designing the specifications of future flagship observatories. However, most models differ in methodologies and input data, which can lead to significantly different spectra. In this paper, we present the experimental protocol of the Modeling Atmospheric Lines By the Exoplanet Community (MALBEC) project. MALBEC is an exoplanet model intercomparison project that belongs to the Climates Using Interactive Suites of Intercomparisons Nested for Exoplanet Studies framework, which aims to provide the exoplanet community with a large and diverse set of comparison and validation of models. The proposed protocol tests include a large set of initial participating RT models, a broad range of atmospheres (from hot Jupiters to temperate terrestrials), and several observation geometries, which would allow us to quantify and compare the differences between different RT models used by the exoplanetary community. Two types of tests are proposed: transit spectroscopy and direct imaging modeling, with results from the proposed tests to be published in dedicated follow-up papers. To encourage the community to join this comparison effort and as an example, we present simulation results for one specific transit case (GJ-1214 b), in which we find notable differences in how the various codes handle the discretization of the atmospheres (e.g., sub-layering), the treatment of molecular opacities (e.g., correlated-k, line-by-line) and the default spectroscopic repositories generally used by each model (e.g., HITRAN, HITEMP, ExoMol).
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- 2024
5. Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b
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Bell, Taylor J., Crouzet, Nicolas, Cubillos, Patricio E., Kreidberg, Laura, Piette, Anjali A. A., Roman, Michael T., Barstow, Joanna K., Blecic, Jasmina, Carone, Ludmila, Coulombe, Louis-Philippe, Ducrot, Elsa, Hammond, Mark, Mendonça, João M., Moses, Julianne I., Parmentier, Vivien, Stevenson, Kevin B., Teinturier, Lucas, Zhang, Michael, Batalha, Natalie M., Bean, Jacob L., Benneke, Björn, Charnay, Benjamin, Chubb, Katy L., Demory, Brice-Olivier, Gao, Peter, Lee, Elspeth K. H., López-Morales, Mercedes, Morello, Giuseppe, Rauscher, Emily, Sing, David K., Tan, Xianyu, Venot, Olivia, Wakeford, Hannah R., Aggarwal, Keshav, Ahrer, Eva-Maria, Alam, Munazza K., Baeyens, Robin, Barrado, David, Caceres, Claudio, Carter, Aarynn L., Casewell, Sarah L., Challener, Ryan C., Crossfield, Ian J. M., Decin, Leen, Désert, Jean-Michel, Dobbs-Dixon, Ian, Dyrek, Achrène, Espinoza, Néstor, Feinstein, Adina D., Gibson, Neale P., Harrington, Joseph, Helling, Christiane, Hu, Renyu, Iro, Nicolas, Kempton, Eliza M.-R., Kendrew, Sarah, Komacek, Thaddeus D., Krick, Jessica, Lagage, Pierre-Olivier, Leconte, Jérémy, Lendl, Monika, Lewis, Neil T., Lothringer, Joshua D., Malsky, Isaac, Mancini, Luigi, Mansfield, Megan, Mayne, Nathan J., Evans-Soma, Thomas M., Molaverdikhani, Karan, Nikolov, Nikolay K., Nixon, Matthew C., Palle, Enric, Petit dit de la Roche, Dominique J. M., Piaulet, Caroline, Powell, Diana, Rackham, Benjamin V., Schneider, Aaron D., Steinrueck, Maria E., Taylor, Jake, Welbanks, Luis, Yurchenko, Sergei N., Zhang, Xi, and Zieba, Sebastian
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- 2024
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6. Pilot Study on the Relationship Between Acceptance of Collaborative Robots and Stress
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Lutin, Erika, Elprama, Shirley A., Cornelis, Jan, Leconte, Patricia, Van Doninck, Bart, Witters, Maarten, De Raedt, Walter, and Jacobs, An
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- 2024
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7. Is thermal aptitude a pivotal driver in the establishment of recent Puccinia striiformis f. sp. tritici lineages in Europe?
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Meyer, Kevin J. G., Leconte, Marc, Vidal, Tiphaine, Goyeau, Henriette, and Suffert, Frédéric
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- 2024
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8. Accurate measurements of delayed neutron data for reactor applications: methodology and application to 235U(nth,f)
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Leconte, Pierre, Belverge, Dorian, Bernard, David, Chebboubi, Abdelhazize, Kessedjian, Grégoire, Foligno, Daniela, Geslot, Benoit, Sardet, Alix, Casoli, Pierre, Kooyman, Timothée, Pépino, Alexandra, Domergue, Christophe, Doré, Diane, Ledoux, Xavier, Mathieu, Ludovic, Méplan, Olivier, Billebaud, Annick, Cheymol, Benjamin, Marie, Nathalie, Lecolley, François-René, Lecouey, Jean-Luc, Koester, Ulli, Solder, Torsten, and Mutti, Paolo
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- 2024
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9. A randomised study to evaluate the potential added value of shared meditation involving people with cancer, health professionals and third persons compared to meditation conducted with patients only: design of the Implic-2 protocol
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Virginie Prevost, Titi Tran, Alexandra Leconte, Justine Lequesne, Marie Fernette, Carine Segura, Sylvie Chevigné, Mylène Gouriot, and Bénédicte Clarisse
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Mindfulness ,Randomised trial ,Cancer patients ,Health professionals ,Well-being ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Background In oncology, the suffering of patients and the burnout of health professionals are key issues. Mindfulness meditation is a holistic approach that can help to improve well-being. While numerous studies have shown the benefits of meditation for both patients and health professionals, the added value of offering shared meditation to groups of patients, health professionals and third persons has not been assessed. Beyond strengthening the relationship between carers and patients, opening up meditation sessions to third parties (neither carers nor patients) enables patients to escape the stigma of their illness. We previously conducted a pilot study that validated the feasibility and the relevance of shared meditation with a specifically designed programme. Methods/Design IMPLIC-2 is a two-arm randomised study designed to assess the added value of this meditation programme (optimised following the pilot study), particularly for cancer patients (our target population). People motivated to follow the programme, without previous regular practice of meditation and able to participate in the sessions are eligible. The study will include 96 participants: 16 health professionals, 16 third persons and 64 patients. The latter will be randomized in two arms: the experimental arm (“Shared” meditation) consisting of 4 mixed groups of 8 patients, 4 health professionals and 4 third parties, and the control arm (“Patient” meditation) consisting of 2 groups of 16 patients. Validated questionnaires will be used to measure the effects of the programme, notably in terms of quality of life, perceived stress, feelings of self-efficacy, qualities of mindfulness and self-compassion, and carers’ burn-out. Participants' perception of a change in their quality of life and satisfaction will be measured at the end of the programme. A complementary qualitative focus-group approach will be used to optimise implementation of the programme beyond the study. Discussion The well-being of oncology patients would be improved. Dealing with overworked carers would have a beneficial impact on the way they interact with patients. In addition, encounters between the three types of population will allow otherness to be viewed differently and alleviate suffering by promoting collective humanity. Trial Registration NCT06041607, registered: 09/18/2023. Protocol version Version n°1.2 dated from 08/29/2023.
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- 2024
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10. 3D-ARM-Gaze: a public dataset of 3D Arm Reaching Movements with Gaze information in virtual reality
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Bianca Lento, Effie Segas, Vincent Leconte, Emilie Doat, Frederic Danion, Renaud Péteri, Jenny Benois-Pineau, and Aymar de Rugy
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Science - Abstract
Abstract 3D-ARM-Gaze is a public dataset designed to provide natural arm movements together with visual and gaze information when reaching objects in a wide reachable space from a precisely controlled, comfortably seated posture. Participants were involved in picking and placing objects in various positions and orientations in a virtual environment, whereby a specific procedure maximized the workspace explored while ensuring a consistent seated posture by guiding participants to a predetermined neutral posture via visual feedback from the trunk and shoulders. These experimental settings enabled to capture natural arm movements with high median success rates (>98% objects reached) and minimal compensatory movements. The dataset regroups more than 2.5 million samples recorded from 20 healthy participants performing 14 000 single pick-and-place movements (700 per participant). While initially designed to explore novel prosthesis control strategies based on natural eye-hand and arm coordination, this dataset will also be useful to researchers interested in core sensorimotor control, humanoid robotics, human-robot interactions, as well as for the development and testing of associated solutions in gaze-guided computer vision.
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- 2024
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11. Layer-Dependent Interaction Effects in the Electronic Structure of Twisted Bilayer Graphene Devices.
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Dale, Nicholas, Utama, M, Lee, Dongkyu, Leconte, Nicolas, Zhao, Sihan, Lee, Kyunghoon, Taniguchi, Takashi, Watanabe, Kenji, Jozwiak, Chris, Koch, Roland, Jung, Jeil, Wang, Feng, Lanzara, Alessandra, Rotenberg, Eli, and Bostwick, Aaron
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ARPES ,band gap. ,electron−electron interaction ,moiré heterostructures ,symmetry-breaking ,twisted bilayer graphene - Abstract
Near the magic angle, strong correlations drive many intriguing phases in twisted bilayer graphene (tBG) including unconventional superconductivity and chern insulation. Whether correlations can tune symmetry breaking phases in tBG at intermediate (≳ 2°) twist angles remains an open fundamental question. Here, using ARPES, we study the effects of many-body interactions and displacement field on the band structure of tBG devices at an intermediate (3°) twist angle. We observe a layer- and doping-dependent renormalization of bands at the K points that is qualitatively consistent with moiré models of the Hartree-Fock interaction. We provide evidence of correlation-enhanced inversion symmetry-breaking, manifested by gaps at the Dirac points that are tunable with doping. These results suggest that electronic interactions play a significant role in the physics of tBG even at intermediate twist angles and present a new pathway toward engineering band structure and symmetry-breaking phases in moiré heterostructures.
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- 2023
12. A broadband thermal emission spectrum of the ultra-hot Jupiter WASP-18b.
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Coulombe, Louis-Philippe, Benneke, Björn, Challener, Ryan, Piette, Anjali, Wiser, Lindsey, Mansfield, Megan, MacDonald, Ryan, Beltz, Hayley, Feinstein, Adina, Radica, Michael, Savel, Arjun, Dos Santos, Leonardo, Bean, Jacob, Parmentier, Vivien, Wong, Ian, Rauscher, Emily, Komacek, Thaddeus, Kempton, Eliza, Tan, Xianyu, Hammond, Mark, Lewis, Neil, Line, Michael, Lee, Elspeth, Shivkumar, Hinna, Crossfield, Ian, Nixon, Matthew, Rackham, Benjamin, Wakeford, Hannah, Welbanks, Luis, Zhang, Xi, Batalha, Natalie, Berta-Thompson, Zachory, Changeat, Quentin, Désert, Jean-Michel, Espinoza, Néstor, Goyal, Jayesh, Harrington, Joseph, Knutson, Heather, Kreidberg, Laura, López-Morales, Mercedes, Shporer, Avi, Sing, David, Stevenson, Kevin, Aggarwal, Keshav, Ahrer, Eva-Maria, Alam, Munazza, Bell, Taylor, Blecic, Jasmina, Caceres, Claudio, Carter, Aarynn, Casewell, Sarah, Crouzet, Nicolas, Cubillos, Patricio, Decin, Leen, Fortney, Jonathan, Gibson, Neale, Heng, Kevin, Henning, Thomas, Iro, Nicolas, Kendrew, Sarah, Lagage, Pierre-Olivier, Leconte, Jérémy, Lendl, Monika, Lothringer, Joshua, Mancini, Luigi, Mikal-Evans, Thomas, Molaverdikhani, Karan, Nikolov, Nikolay, Ohno, Kazumasa, Palle, Enric, Piaulet, Caroline, Redfield, Seth, Roy, Pierre-Alexis, Tsai, Shang-Min, Venot, Olivia, and Wheatley, Peter
- Abstract
Close-in giant exoplanets with temperatures greater than 2,000 K (ultra-hot Jupiters) have been the subject of extensive efforts to determine their atmospheric properties using thermal emission measurements from the Hubble Space Telescope (HST) and Spitzer Space Telescope1-3. However, previous studies have yielded inconsistent results because the small sizes of the spectral features and the limited information content of the data resulted in high sensitivity to the varying assumptions made in the treatment of instrument systematics and the atmospheric retrieval analysis3-12. Here we present a dayside thermal emission spectrum of the ultra-hot Jupiter WASP-18b obtained with the NIRISS13 instrument on the JWST. The data span 0.85 to 2.85 μm in wavelength at an average resolving power of 400 and exhibit minimal systematics. The spectrum shows three water emission features (at >6σ confidence) and evidence for optical opacity, possibly attributable to H-, TiO and VO (combined significance of 3.8σ). Models that fit the data require a thermal inversion, molecular dissociation as predicted by chemical equilibrium, a solar heavy-element abundance (metallicity, [Formula: see text] times solar) and a carbon-to-oxygen (C/O) ratio less than unity. The data also yield a dayside brightness temperature map, which shows a peak in temperature near the substellar point that decreases steeply and symmetrically with longitude towards the terminators.
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- 2023
13. A randomised study to evaluate the potential added value of shared meditation involving people with cancer, health professionals and third persons compared to meditation conducted with patients only: design of the Implic-2 protocol
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Prevost, Virginie, Tran, Titi, Leconte, Alexandra, Lequesne, Justine, Fernette, Marie, Segura, Carine, Chevigné, Sylvie, Gouriot, Mylène, and Clarisse, Bénédicte
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- 2024
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14. 3D-ARM-Gaze: a public dataset of 3D Arm Reaching Movements with Gaze information in virtual reality
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Lento, Bianca, Segas, Effie, Leconte, Vincent, Doat, Emilie, Danion, Frederic, Péteri, Renaud, Benois-Pineau, Jenny, and de Rugy, Aymar
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- 2024
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15. Calcium-rich dairy matrix protects better than mineral calcium against colonic luminal haem-induced alterations in male rats
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Olier, Maïwenn, Naud, Nathalie, Fouché, Edwin, Tondereau, Valérie, Ahn, Ingrid, Leconte, Nadine, Blas-Y-Estrada, Florence, Garric, Gilles, Heliès-Toussaint, Cécile, Harel-Oger, Marielle, Marmonier, Corinne, Théodorou, Vassilia, Guéraud, Françoise, Jan, Gwénaël, and Pierre, Fabrice
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- 2024
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16. The OVAREX study: Establishment of ex vivo ovarian cancer models to validate innovative therapies and to identify predictive biomarkers
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Thorel, Lucie, Divoux, Jordane, Lequesne, Justine, Babin, Guillaume, Morice, Pierre-Marie, Florent, Romane, Desmartin, Guillaume, Lecouflet, Lucie, Marde Alagama, Chloé, Leconte, Alexandra, Clarisse, Bénédicte, Briand, Mélanie, Rouzier, Roman, Gaichies, Léopold, Martin-Françoise, Sandrine, Le Brun, Jean-François, Denoyelle, Christophe, Vigneron, Nicolas, Jeanne, Corinne, Blanc-Fournier, Cécile, Leman, Raphaël, Vaur, Dominique, Figeac, Martin, Meryet-Figuiere, Matthieu, Joly, Florence, Weiswald, Louis-Bastien, Poulain, Laurent, and Dolivet, Enora
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- 2024
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17. Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene
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Zhang, Hongyun, Li, Qian, Park, Youngju, Jia, Yujin, Chen, Wanying, Li, Jiaheng, Liu, Qinxin, Bao, Changhua, Leconte, Nicolas, Zhou, Shaohua, Wang, Yuan, Watanabe, Kenji, Taniguchi, Takashi, Avila, Jose, Dudin, Pavel, Yu, Pu, Weng, Hongming, Duan, Wenhui, Wu, Quansheng, Jung, Jeil, and Zhou, Shuyun
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- 2024
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18. Sensorimotor adaptation of locomotor synergies to gravitational constraint
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Guillaud, Etienne, Leconte, Vincent, Doat, Emilie, Guehl, Dominique, and Cazalets, Jean-René
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- 2024
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19. Pathogenic missense variation in PABPC1L/EPAB causes female infertility due to oocyte maturation arrest at the germinal vesicle stage
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Okutman, O., Gürbüz, A. S., Büyük, U., Real, E., Leconte, R., Chennen, K., Mayer, C., Muller, J., Le May, N., and Viville, S.
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- 2024
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20. Calcium-rich dairy matrix protects better than mineral calcium against colonic luminal haem-induced alterations in male rats
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Maïwenn Olier, Nathalie Naud, Edwin Fouché, Valérie Tondereau, Ingrid Ahn, Nadine Leconte, Florence Blas-Y-Estrada, Gilles Garric, Cécile Heliès-Toussaint, Marielle Harel-Oger, Corinne Marmonier, Vassilia Théodorou, Françoise Guéraud, Gwénaël Jan, and Fabrice Pierre
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Nutrition. Foods and food supply ,TX341-641 ,Food processing and manufacture ,TP368-456 - Abstract
Abstract The haemoglobin content in meat is consistently associated with an increased risk of colorectal cancer, whereas calcium may play a role as a chemopreventive agent. Using rodent models, calcium salts have been shown to prevent the promotion of haem-induced and red meat-induced colorectal carcinogenesis by limiting the bioavailability of the gut luminal haem iron. Therefore, this study aimed to compare impacts of dietary calcium provided as calcium salts or dairy matrix on gut homoeostasis perturbations by high haeminic or non-haeminic iron intakes. A 3-week intervention study was conducted using Fischer 344 rats. Compared to the ferric citrate-enriched diet, the haemoglobin-enriched diet led to increased faecal, mucosal, and urinary lipoperoxidation-related biomarkers, resulting from higher gut luminal haem iron bioavailability. This redox imbalance was associated to a dysbiosis of faecal microbiota. The addition of calcium to haemoglobin-enriched diets limited haem iron bioavailability and counteracted redox imbalance, with improved preventive efficacy when calcium was provided in dairy matrix. Data integration revealed correlations between haem-induced lipoperoxidation products and bacterial communities belonging to Peptococcaceae, Eubacterium coprostanoligenes group, and Bifidobacteriaceae. This integrated approach provides evidence of the benefits of dairy matrix as a dietary calcium vehicle to counteract the deleterious side-effects of meat consumption.
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- 2024
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21. The OVAREX study: Establishment of ex vivo ovarian cancer models to validate innovative therapies and to identify predictive biomarkers
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Lucie Thorel, Jordane Divoux, Justine Lequesne, Guillaume Babin, Pierre-Marie Morice, Romane Florent, Guillaume Desmartin, Lucie Lecouflet, Chloé Marde Alagama, Alexandra Leconte, Bénédicte Clarisse, Mélanie Briand, Roman Rouzier, Léopold Gaichies, Sandrine Martin-Françoise, Jean-François Le Brun, Christophe Denoyelle, Nicolas Vigneron, Corinne Jeanne, Cécile Blanc-Fournier, Raphaël Leman, Dominique Vaur, Martin Figeac, Matthieu Meryet-Figuiere, Florence Joly, Louis-Bastien Weiswald, Laurent Poulain, and Enora Dolivet
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Ovarian cancer ,Patient-derived tumor organoids ,Patient-derived tumor xenografts ,Explants ,Spheroids ,Predictive functional assays. ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Background Ovarian cancer is the first cause of death from gynecological malignancies mainly due to development of chemoresistance. Despite the emergence of PARP inhibitors, which have revolutionized the therapeutic management of some of these ovarian cancers, the 5-year overall survival rate remains around 45%. Therefore, it is crucial to develop new therapeutic strategies, to identify predictive biomarkers and to predict the response to treatments. In this context, functional assays based on patient-derived tumor models could constitute helpful and relevant tools for identifying efficient therapies or to guide clinical decision making. Method The OVAREX study is a single-center non-interventional study which aims at investigating the feasibility of establishing in vivo and ex vivo models and testing ex vivo models to predict clinical response of ovarian cancer patients. Patient-Derived Xenografts (PDX) will be established from tumor fragments engrafted subcutaneously into immunocompromised mice. Explants will be generated by slicing tumor tissues and Ascites-Derived Spheroids (ADS) will be isolated following filtration of ascites. Patient-derived tumor organoids (PDTO) will be established after dissociation of tumor tissues or ADS, cell embedding into extracellular matrix and culture in specific medium. Molecular and histological characterizations will be performed to compare tumor of origin and paired models. Response of ex vivo tumor-derived models to conventional chemotherapy and PARP inhibitors will be assessed and compared to results of companion diagnostic test and/or to the patient’s response to evaluate their predictive value. Discussion This clinical study aims at generating PDX and ex vivo models (PDTO, ADS, and explants) from tumors or ascites of ovarian cancer patients who will undergo surgical procedure or paracentesis. We aim at demonstrating the predictive value of ex vivo models for their potential use in routine clinical practice as part of precision medicine, as well as establishing a collection of relevant ovarian cancer models that will be useful for the evaluation of future innovative therapies. Trial registration The clinical trial has been validated by local research ethic committee on January 25th 2019 and registered at ClinicalTrials.gov with the identifier NCT03831230 on January 28th 2019, last amendment v4 accepted on July 18, 2023.
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- 2024
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22. Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene
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Hongyun Zhang, Qian Li, Youngju Park, Yujin Jia, Wanying Chen, Jiaheng Li, Qinxin Liu, Changhua Bao, Nicolas Leconte, Shaohua Zhou, Yuan Wang, Kenji Watanabe, Takashi Taniguchi, Jose Avila, Pavel Dudin, Pu Yu, Hongming Weng, Wenhui Duan, Quansheng Wu, Jeil Jung, and Shuyun Zhou
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Science - Abstract
Abstract Twisted bilayer graphene (tBLG) provides a fascinating platform for engineering flat bands and inducing correlated phenomena. By designing the stacking architecture of graphene layers, twisted multilayer graphene can exhibit different symmetries with rich tunability. For example, in twisted monolayer-bilayer graphene (tMBG) which breaks the C 2z symmetry, transport measurements reveal an asymmetric phase diagram under an out-of-plane electric field, exhibiting correlated insulating state and ferromagnetic state respectively when reversing the field direction. Revealing how the electronic structure evolves with electric field is critical for providing a better understanding of such asymmetric field-tunable properties. Here we report the experimental observation of field-tunable dichotomic electronic structure of tMBG by nanospot angle-resolved photoemission spectroscopy (NanoARPES) with operando gating. Interestingly, selective enhancement of the relative spectral weight contributions from monolayer and bilayer graphene is observed when switching the polarity of the bias voltage. Combining experimental results with theoretical calculations, the origin of such field-tunable electronic structure, resembling either tBLG or twisted double-bilayer graphene (tDBG), is attributed to the selectively enhanced contribution from different stacking graphene layers with a strong electron-hole asymmetry. Our work provides electronic structure insights for understanding the rich field-tunable physics of tMBG.
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- 2024
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23. High-Order Fractal Quantum Oscillations in Graphene/BN Superlattices in the Extreme Doping Limit
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Shi, Wu, Kahn, Salman, Leconte, Nicolas, Taniguchi, Takashi, Watanabe, Kenji, Crommie, Michael, Jung, Jeil, and Zettl, Alex
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Quantum Physics ,Physical Sciences ,Condensed Matter Physics ,Brain Disorders ,MSD-General ,MSD-Functional Nanomachines ,MSD-VdW Heterostructures ,Mathematical Sciences ,Engineering ,General Physics ,Mathematical sciences ,Physical sciences - Abstract
Recent studies of van der Waals (vdW) heterostructures and superlattices have shown intriguing quantum phenomena, but these have been largely explored only in the moderate carrier density regime. Here, we report the probe of high-temperature fractal Brown-Zak (BZ) quantum oscillations through magnetotransport in the extreme doping regimes by applying a newly developed electron beam doping technique. This technique gives access to both ultrahigh electron and hole densities beyond the dielectric breakdown limit in graphene/BN superlattices, enabling the observation of nonmonotonic carrier-density dependence of fractal BZ states and up to fourth-order fractal BZ features despite strong electron-hole asymmetry. Theoretical tight-binding simulations qualitatively reproduce all observed fractal BZ features and attribute the nonmonotonic dependence to the weakening of superlattice effects at high carrier densities.
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- 2023
24. Photochemically produced SO2 in the atmosphere of WASP-39b.
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Tsai, Shang-Min, Lee, Elspeth, Powell, Diana, Gao, Peter, Zhang, Xi, Moses, Julianne, Hébrard, Eric, Venot, Olivia, Parmentier, Vivien, Jordan, Sean, Hu, Renyu, Alam, Munazza, Alderson, Lili, Batalha, Natalie, Bean, Jacob, Benneke, Björn, Bierson, Carver, Brady, Ryan, Carone, Ludmila, Carter, Aarynn, Chubb, Katy, Inglis, Julie, Leconte, Jérémy, Line, Michael, López-Morales, Mercedes, Miguel, Yamila, Molaverdikhani, Karan, Rustamkulov, Zafar, Sing, David, Stevenson, Kevin, Wakeford, Hannah, Yang, Jeehyun, Aggarwal, Keshav, Baeyens, Robin, Barat, Saugata, de Val-Borro, Miguel, Daylan, Tansu, Fortney, Jonathan, France, Kevin, Goyal, Jayesh, Grant, David, Kirk, James, Kreidberg, Laura, Louca, Amy, Moran, Sarah, Mukherjee, Sagnick, Nasedkin, Evert, Ohno, Kazumasa, Rackham, Benjamin, Redfield, Seth, Taylor, Jake, Tremblin, Pascal, Visscher, Channon, Wallack, Nicole, Welbanks, Luis, Youngblood, Allison, Ahrer, Eva-Maria, Batalha, Natasha, Behr, Patrick, Berta-Thompson, Zachory, Blecic, Jasmina, Casewell, S, Crossfield, Ian, Crouzet, Nicolas, Cubillos, Patricio, Decin, Leen, Désert, Jean-Michel, Feinstein, Adina, Gibson, Neale, Harrington, Joseph, Heng, Kevin, Henning, Thomas, Kempton, Eliza, Krick, Jessica, Lagage, Pierre-Olivier, Lendl, Monika, Lothringer, Joshua, Mansfield, Megan, Mayne, N, Mikal-Evans, Thomas, Palle, Enric, Schlawin, Everett, Shorttle, Oliver, Wheatley, Peter, and Yurchenko, Sergei
- Abstract
Photochemistry is a fundamental process of planetary atmospheres that regulates the atmospheric composition and stability1. However, no unambiguous photochemical products have been detected in exoplanet atmospheres so far. Recent observations from the JWST Transiting Exoplanet Community Early Release Science Program2,3 found a spectral absorption feature at 4.05 μm arising from sulfur dioxide (SO2) in the atmosphere of WASP-39b. WASP-39b is a 1.27-Jupiter-radii, Saturn-mass (0.28 MJ) gas giant exoplanet orbiting a Sun-like star with an equilibrium temperature of around 1,100 K (ref. 4). The most plausible way of generating SO2 in such an atmosphere is through photochemical processes5,6. Here we show that the SO2 distribution computed by a suite of photochemical models robustly explains the 4.05-μm spectral feature identified by JWST transmission observations7 with NIRSpec PRISM (2.7σ)8 and G395H (4.5σ)9. SO2 is produced by successive oxidation of sulfur radicals freed when hydrogen sulfide (H2S) is destroyed. The sensitivity of the SO2 feature to the enrichment of the atmosphere by heavy elements (metallicity) suggests that it can be used as a tracer of atmospheric properties, with WASP-39b exhibiting an inferred metallicity of about 10× solar. We further point out that SO2 also shows observable features at ultraviolet and thermal infrared wavelengths not available from the existing observations.
- Published
- 2023
25. Analysis of lipid uptake, storage, and fatty acid oxidation by group 2 innate lymphoid cells
- Author
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Audrey Roy-Dorval, Rebecca C. Deagle, Frederik Roth, Mathilde Raybaud, Nailya Ismailova, Sai Sakktee Krisna, Damon G. K. Aboud, Camille Stegen, Julien Leconte, Gabriel Berberi, Ademola Esomojumi, and Jörg H. Fritz
- Subjects
group 2 innate lymphoid cells (ILC2) ,type 2 immunity ,immunometabolism ,fatty acid uptake ,lipid droplets ,fatty acid oxidation (FAO) ,Immunologic diseases. Allergy ,RC581-607 - Abstract
Group 2 Innate Lymphoid Cells (ILC2) are critical drivers of both innate and adaptive type 2 immune responses, known to orchestrate processes involved in tissue restoration and wound healing. In addition, ILC2 have been implicated in chronic inflammatory barrier disorders in type 2 immunopathologies such as allergic rhinitis and asthma. ILC2 in the context of allergen-driven airway inflammation have recently been shown to influence local and systemic metabolism, as well as being rich in lipid-storing organelles called lipid droplets. However, mechanisms of ILC2 lipid anabolism and catabolism remain largely unknown and the impact of these metabolic processes in regulating ILC2 phenotypes and effector functions has not been extensively characterized. ILC2 phenotypes and effector functions are shaped by their metabolic status, and determining the metabolic requirements of ILC2 is critical in understanding their role in type 2 immune responses and their associated pathophysiology. We detail here a novel experimental method of implementing flow cytometry for large scale analysis of fatty acid uptake, storage of neutral lipids, and fatty acid oxidation in primary murine ILC2 with complementary morphological analysis of lipid storage using confocal microscopy. By combining flow cytometry and confocal microscopy, we can identify the metabolic lipid requirements for ILC2 functions as well as characterize the phenotype of lipid storage in ILC2. Linking lipid metabolism pathways to ILC2 phenotypes and effector functions is critical for the assessment of novel pharmaceutical strategies to regulate ILC2 functions in type 2 immunopathologies.
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- 2024
- Full Text
- View/download PDF
26. Life cycle inventory and life cycle impact assessment datasets of an industrial-scale milk fractionation process generating 5 co-products: Cream, casein, lactose and two whey-protein ingredients enriched in α-lactalbumin or β-lactoglobulin
- Author
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Fanny Guyomarc'h, Félicie Héquet, Samuel Le Féon, Nadine Leconte, Fabienne Garnier-Lambrouin, Julie Auberger, Caroline Malnoë, Caroline Pénicaud, and Geneviève Gésan-Guiziou
- Subjects
Environmental assessment ,LCA ,LCI ,Co-product ,Subdivision ,Dairy processing ,Computer applications to medicine. Medical informatics ,R858-859.7 ,Science (General) ,Q1-390 - Abstract
Food plays a significant role in the environmental impacts of human activities. However, many agro-industrial processes are multi-product systems and their impacts need to be distributed between the different co-products in order to properly address two major issues: (1) prevention of food spoilage and food losses and (2) the eco-design of food systems, from processing up to recommendations for changes in Western diets. As a culturally and nutritionally central component of most human diets, milk is critical because processing is a preservation issue and most dairy products follow from separations, thereby generating co-products. Life Cycle Assessment (LCA) is a reference and standard method that allows quantification of the potential environmental impacts of a manufactured product throughout its life cycle. Application of the method requires foreground information on the system considered, as well as input and output flows that feed and exit the system. This data paper provides data related to the fractionation of milk into cream, casein, lactose and two whey protein ingredients at industrial scale, using up-to-date technologies used in French dairy factories in years 2000–2010s. Cleaning is included. Transcription of these input and output flows into a selection of processes in the Agribalyse 3.0.1 and Ecoinvent 3.8 databases is also provided. Application of the LCA method in its attributional approach leaves methodological choices up to the practitioner, such as subdivision of the system, allocation of the environmental burden where subdivision is not applied or not possible, and aggregation of the impacts. Therefore, this data paper also provides the allocation factors that are necessary to apply mass, dry matter, protein or economic allocation at every separation operation throughout the processing itinerary. Using the characterization method EF 3.0, this data paper provides the potential environmental impacts of the 5 co-products obtained with an initial input of 600 tons of raw milk, i.e., 63 tons of cream, 183 tons of wet casein, 90 tons of lactose, 1.7 ton of dried β-lactoglobulin and 0.3 ton of dried α-lactalbumin. The respective shares of the 5 co-products are calculated for each allocation rule. Finally, this data paper provides the potential environmental impacts for the manufacture of 1 kg of α-lactalbumin enriched ingredient, as the co-product with the longest process itinerary, with details of all intermediate input contributions as well as two possible aggregation rules: by step or by input type. The dataset participates in providing often confidential industrial-scale LCI data to the public. It will be helpful for the eco-design of future itineraries. In particular, it contributes to taking the fate of the co-products into account when using LCA for such eco-design.
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- 2024
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27. Biochemical Analysis Leads to Improved Orthogonal Bioluminescent Tools.
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Williams, Sierra, Gewing-Mullins, Jordan, Lieberman, Whitney, Kolbaba-Kartchner, Bethany, Iqbal, Reema, Burgess, Hana, Colee, Clair, Ornelas, Marya, Reid-McLaughlin, Edison, Mills, Jeremy, Leconte, Aaron, and Prescher, Jennifer
- Subjects
biochemical characterization ,bioluminescence ,luciferase ,luciferin ,thermostability ,Firefly Luciferin ,Luminescent Measurements ,Luciferases ,Luciferins ,Mutation - Abstract
Engineered luciferase-luciferin pairs have expanded the number of cellular targets that can be visualized in tandem. While light production relies on selective processing of synthetic luciferins by mutant luciferases, little is known about the origin of selectivity. The development of new and improved pairs requires a better understanding of the structure-function relationship of bioluminescent probes. In this work, we report a biochemical approach to assessing and optimizing two popular bioluminescent pairs: Cashew/d-luc and Pecan/4-BrLuc. Single mutants derived from Cashew and Pecan revealed key residues for selectivity and thermal stability. Stability was further improved through a rational addition of beneficial residues. In addition to providing increased stability, the known stabilizing mutations surprisingly also improved selectivity. The resultant improved pair of luciferases are >100-fold selective for their respective substrates and highly thermally stable. Collectively, this work highlights the importance of mechanistic insight for improving bioluminescent pairs and provides significantly improved Cashew and Pecan enzymes which should be immediately suitable for multicomponent imaging applications.
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- 2023
28. Identification of carbon dioxide in an exoplanet atmosphere
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Ahrer, Eva-Maria, Alderson, Lili, Batalha, Natalie M, Batalha, Natasha E, Bean, Jacob L, Beatty, Thomas G, Bell, Taylor J, Benneke, Bjorn, Berta-Thompson, Zachory K, Carter, Aarynn L, Crossfield, Ian JM, Espinoza, Nestor, Feinstein, Adina D, Fortney, Jonathan J, Gibson, Neale P, Goyal, Jayesh M, Kempton, Eliza M-R, Kirk, James, Kreidberg, Laura, Lopez-Morales, Mercedes, Line, Michael R, Lothringer, Joshua D, Moran, Sarah E, Mukherjee, Sagnick, Ohno, Kazumasa, Parmentier, Vivien, Piaulet, Caroline, Rustamkulov, Zafar, Schlawin, Everett, Sing, David K, Stevenson, Kevin B, Wakeford, Hannah R, Allen, Natalie H, Birkmann, Stephan M, Brande, Jonathan, Crouzet, Nicolas, Cubillos, Patricio E, Damiano, Mario, Desert, Jean-Michel, Gao, Peter, Harrington, Joseph, Hu, Renyu, Kendrew, Sarah, Knutson, Heather A, Lagage, Pierre-Olivier, Leconte, Jeremy, Lendl, Monika, MacDonald, Ryan J, May, EM, Miguel, Yamila, Molaverdikhani, Karan, Moses, Julianne I, Murray, Catriona Anne, Nehring, Molly, Nikolov, Nikolay K, de la Roche, DJM Petit Dit, Radica, Michael, Roy, Pierre-Alexis, Stassun, Keivan G, Taylor, Jake, Waalkes, William C, Wachiraphan, Patcharapol, Welbanks, Luis, Wheatley, Peter J, Aggarwal, Keshav, Alam, Munazza K, Banerjee, Agnibha, Barstow, Joanna K, Blecic, Jasmina, Casewell, SL, Changeat, Quentin, Chubb, KL, Colon, Knicole D, Coulombe, Louis-Philippe, Daylan, Tansu, De Val-Borro, Miguel, Decin, Leen, Dos Santos, Leonardo A, Flagg, Laura, France, Kevin, Fu, Guangwei, Munoz, A Garcia, Gizis, John E, Glidden, Ana, Grant, David, Heng, Kevin, Henning, Thomas, Hong, Yu-Cian, Inglis, Julie, Iro, Nicolas, Kataria, Tiffany, Komacek, Thaddeus D, Krick, Jessica E, Lee, Elspeth KH, Lewis, Nikole K, Lillo-Box, Jorge, Lustig-Yaeger, Jacob, Mancini, Luigi, Mandell, Avi M, and Mansfield, Megan
- Subjects
JWST Transiting Exoplanet Community Early Release Science Team ,General Science & Technology - Abstract
Carbon dioxide (CO2) is a key chemical species that is found in a wide range of planetary atmospheres. In the context of exoplanets, CO2 is an indicator of the metal enrichment (that is, elements heavier than helium, also called 'metallicity')1-3, and thus the formation processes of the primary atmospheres of hot gas giants4-6. It is also one of the most promising species to detect in the secondary atmospheres of terrestrial exoplanets7-9. Previous photometric measurements of transiting planets with the Spitzer Space Telescope have given hints of the presence of CO2, but have not yielded definitive detections owing to the lack of unambiguous spectroscopic identification10-12. Here we present the detection of CO2 in the atmosphere of the gas giant exoplanet WASP-39b from transmission spectroscopy observations obtained with JWST as part of the Early Release Science programme13,14. The data used in this study span 3.0-5.5 micrometres in wavelength and show a prominent CO2 absorption feature at 4.3 micrometres (26-sigma significance). The overall spectrum is well matched by one-dimensional, ten-times solar metallicity models that assume radiative-convective-thermochemical equilibrium and have moderate cloud opacity. These models predict that the atmosphere should have water, carbon monoxide and hydrogen sulfide in addition to CO2, but little methane. Furthermore, we also tentatively detect a small absorption feature near 4.0 micrometres that is not reproduced by these models.
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- 2023
29. Early Release Science of the exoplanet WASP-39b with JWST NIRCam.
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Ahrer, Eva-Maria, Stevenson, Kevin, Mansfield, Megan, Moran, Sarah, Brande, Jonathan, Morello, Giuseppe, Murray, Catriona, Nikolov, Nikolay, Petit Dit de la Roche, Dominique, Schlawin, Everett, Wheatley, Peter, Zieba, Sebastian, Batalha, Natasha, Damiano, Mario, Goyal, Jayesh, Lendl, Monika, Lothringer, Joshua, Mukherjee, Sagnick, Ohno, Kazumasa, Batalha, Natalie, Battley, Matthew, Bean, Jacob, Beatty, Thomas, Benneke, Björn, Berta-Thompson, Zachory, Carter, Aarynn, Cubillos, Patricio, Daylan, Tansu, Espinoza, Néstor, Gao, Peter, Gibson, Neale, Gill, Samuel, Harrington, Joseph, Hu, Renyu, Kreidberg, Laura, Lewis, Nikole, Line, Michael, López-Morales, Mercedes, Parmentier, Vivien, Powell, Diana, Sing, David, Wakeford, Hannah, Welbanks, Luis, Alam, Munazza, Alderson, Lili, Allen, Natalie, Anderson, David, Barstow, Joanna, Bayliss, Daniel, Bell, Taylor, Blecic, Jasmina, Bryant, Edward, Burleigh, Matthew, Carone, Ludmila, Casewell, S, Changeat, Quentin, Chubb, Katy, Crossfield, Ian, Crouzet, Nicolas, Decin, Leen, Désert, Jean-Michel, Feinstein, Adina, Flagg, Laura, Fortney, Jonathan, Gizis, John, Heng, Kevin, Iro, Nicolas, Kempton, Eliza, Kendrew, Sarah, Kirk, James, Knutson, Heather, Komacek, Thaddeus, Lagage, Pierre-Olivier, Leconte, Jérémy, Lustig-Yaeger, Jacob, MacDonald, Ryan, Mancini, Luigi, May, E, Mayne, N, Miguel, Yamila, Mikal-Evans, Thomas, Molaverdikhani, Karan, Palle, Enric, Piaulet, Caroline, Rackham, Benjamin, Redfield, Seth, Rogers, Laura, Roy, Pierre-Alexis, Rustamkulov, Zafar, Shkolnik, Evgenya, Sotzen, Kristin, Taylor, Jake, Tremblin, P, Tucker, Gregory, Turner, Jake, de Val-Borro, Miguel, Venot, Olivia, Zhang, Xi, and Tsai, Shang-Min
- Abstract
Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining the dominant chemical processes at work and, if in equilibrium, revealing planet formation histories. Transmission spectroscopy (for example, refs. 1,2) provides the necessary means by constraining the abundances of oxygen- and carbon-bearing species; however, this requires broad wavelength coverage, moderate spectral resolution and high precision, which, together, are not achievable with previous observatories. Now that JWST has commenced science operations, we are able to observe exoplanets at previously uncharted wavelengths and spectral resolutions. Here we report time-series observations of the transiting exoplanet WASP-39b using JWSTs Near InfraRed Camera (NIRCam). The long-wavelength spectroscopic and short-wavelength photometric light curves span 2.0-4.0 micrometres, exhibit minimal systematics and reveal well defined molecular absorption features in the planets spectrum. Specifically, we detect gaseous water in the atmosphere and place an upper limit on the abundance of methane. The otherwise prominent carbon dioxide feature at 2.8 micrometres is largely masked by water. The best-fit chemical equilibrium models favour an atmospheric metallicity of 1-100-times solar (that is, an enrichment of elements heavier than helium relative to the Sun) and a substellar C/O ratio. The inferred high metallicity and low C/O ratio may indicate significant accretion of solid materials during planet formation (for example, refs. 3,4,) or disequilibrium processes in the upper atmosphere (for example, refs. 5,6).
- Published
- 2023
30. Early Release Science of the exoplanet WASP-39b with JWST NIRSpec G395H.
- Author
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Alderson, Lili, Wakeford, Hannah, Alam, Munazza, Batalha, Natasha, Lothringer, Joshua, Adams Redai, Jea, Barat, Saugata, Brande, Jonathan, Damiano, Mario, Daylan, Tansu, Espinoza, Néstor, Flagg, Laura, Goyal, Jayesh, Grant, David, Hu, Renyu, Inglis, Julie, Lee, Elspeth, Mikal-Evans, Thomas, Ramos-Rosado, Lakeisha, Roy, Pierre-Alexis, Wallack, Nicole, Batalha, Natalie, Bean, Jacob, Benneke, Björn, Berta-Thompson, Zachory, Carter, Aarynn, Changeat, Quentin, Colón, Knicole, Crossfield, Ian, Désert, Jean-Michel, Foreman-Mackey, Daniel, Gibson, Neale, Kreidberg, Laura, Line, Michael, López-Morales, Mercedes, Molaverdikhani, Karan, Moran, Sarah, Morello, Giuseppe, Moses, Julianne, Mukherjee, Sagnick, Schlawin, Everett, Sing, David, Stevenson, Kevin, Taylor, Jake, Aggarwal, Keshav, Ahrer, Eva-Maria, Allen, Natalie, Barstow, Joanna, Bell, Taylor, Blecic, Jasmina, Casewell, Sarah, Chubb, Katy, Crouzet, Nicolas, Cubillos, Patricio, Decin, Leen, Feinstein, Adina, Fortney, Joanthan, Harrington, Joseph, Heng, Kevin, Iro, Nicolas, Kempton, Eliza, Kirk, James, Knutson, Heather, Krick, Jessica, Leconte, Jérémy, Lendl, Monika, MacDonald, Ryan, Mancini, Luigi, Mansfield, Megan, May, Erin, Mayne, Nathan, Miguel, Yamila, Nikolov, Nikolay, Ohno, Kazumasa, Palle, Enric, Parmentier, Vivien, Petit Dit de la Roche, Dominique, Piaulet, Caroline, Powell, Diana, Rackham, Benjamin, Redfield, Seth, Rogers, Laura, Rustamkulov, Zafar, Tan, Xianyu, Tremblin, P, Turner, Jake, de Val-Borro, Miguel, Venot, Olivia, Welbanks, Luis, Wheatley, Peter, Zhang, Xi, and Tsai, Shang-Min
- Abstract
Measuring the abundances of carbon and oxygen in exoplanet atmospheres is considered a crucial avenue for unlocking the formation and evolution of exoplanetary systems1,2. Access to the chemical inventory of an exoplanet requires high-precision observations, often inferred from individual molecular detections with low-resolution space-based3-5 and high-resolution ground-based6-8 facilities. Here we report the medium-resolution (R ≈ 600) transmission spectrum of an exoplanet atmosphere between 3 and 5 μm covering several absorption features for the Saturn-mass exoplanet WASP-39b (ref. 9), obtained with the Near Infrared Spectrograph (NIRSpec) G395H grating of JWST. Our observations achieve 1.46 times photon precision, providing an average transit depth uncertainty of 221 ppm per spectroscopic bin, and present minimal impacts from systematic effects. We detect significant absorption from CO2 (28.5σ) and H2O (21.5σ), and identify SO2 as the source of absorption at 4.1 μm (4.8σ). Best-fit atmospheric models range between 3 and 10 times solar metallicity, with sub-solar to solar C/O ratios. These results, including the detection of SO2, underscore the importance of characterizing the chemistry in exoplanet atmospheres and showcase NIRSpec G395H as an excellent mode for time-series observations over this critical wavelength range10.
- Published
- 2023
31. Exploring ways to improve agricultural water management in two Mediterranean irrigated systems: promises of wireless low-tech sensor networks
- Author
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P. Vandôme, C. Leauthaud, S. Moinard, I. Mekki, A. Zairi, F. Charron, J. Leconte, I. Ferchichi, T. Ajmi, and G. Belaud
- Subjects
Environmental sciences ,GE1-350 ,Geology ,QE1-996.5 - Abstract
Unsustainable use of water resources and climate change will exacerbate the already existing tensions on resources, especially in the Mediterranean context. Despite investments in modern, economically and energetically costly equipment, the performance of irrigated agriculture remains below expectations, notably because of inappropriate irrigation practices, due to insufficient knowledge of irrigation actual need and limited use of decision support tools. Access to information at an unprecedented level, via easily accessible low-cost and low-tech sensors, may be a major lever for better identifying achievable performance gains, at different spatial and temporal scales, and for guiding stakeholders towards more sustainable practices. To explore this hypothesis, we have worked on the emergence of such technologies within two Mediterranean irrigated systems (Provence, France, and Cap Bon, Tunisia) facing major water use efficiency issues. Interviews were conducted on each site in order to identify main local needs and constraints that limit sustainable water management, and potential levers to improve irrigation performance. Innovative technological systems (water sensors, automation, Internet of Things networks) have been developed in response and tested in field through a participatory approach. The technologies were then designed to be low energy, low-tech and low-cost, based on the hypothesis that the lack of accessibility – investment and maintenance costs, system readability – of existing equipment was a brake to the dissemination of innovations in the agricultural sector. We believe that the adoption of such technologies could contribute to improve irrigated systems sustainability by playing on several dimensions: promote suitable and sparing water use by improving decision-making; help maintain agricultural production by decreasing input costs; improving water users' working conditions. Generally, accompanying the transition towards more sustainable practices, by providing to the stakeholders keys for better understanding of their system. The performance gains achievable with these innovations, heeding their inherent weaknesses (eg. lower robustness and accuracy), and the potential impacts of their adoption at a larger scale remain to be assessed in an integrated way.
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- 2024
- Full Text
- View/download PDF
32. A generic algorithm to automatically classify urban fabric according to the local climate zone system: implementation in GeoClimate 0.0.1 and application to French cities
- Author
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J. Bernard, E. Bocher, M. Gousseff, F. Leconte, and E. Le Saux Wiederhold
- Subjects
Geology ,QE1-996.5 - Abstract
Geographical features may have a considerable effect on local climate. The local climate zone (LCZ) system proposed by Stewart and Oke (2012) is nowadays seen as a standard approach for classifying any zone according to a set of urban canopy parameters. While many methods already exist to map the LCZ, only few tools are openly and freely available. This paper presents the algorithm implemented in the GeoClimate software to identify the LCZ of any place in the world based on vector data. Six types of information are needed as input: the building footprint, road and rail networks, water, vegetation, and impervious surfaces. First, the territory is partitioned into reference spatial units (RSUs) using the road and rail network, as well as the boundaries of large vegetation and water patches. Then 14 urban canopy parameters are calculated for each RSU. Their values are used to classify each unit to a given LCZ type according to a set of rules. GeoClimate can automatically prepare the inputs and calculate the LCZ for two datasets, namely OpenStreetMap (OSM, available worldwide) and the BD TOPO® v2.2 (BDT, a French dataset produced by the national mapping agency). The LCZ are calculated for 22 French communes using these two datasets in order to evaluate the effect of the dataset on the results. About 55 % of all areas have obtained the same LCZ type, with large differences when differentiating this result by city (from 30 % to 82 %). The agreement is good for large patches of forest and water, as well as for compact mid-rise and open low-rise LCZ types. It is lower for open mid-rise and open high-rise, mainly due to the height underestimation of OSM buildings located in open areas. Through its simplicity of use, GeoClimate has great potential for new collaboration in the LCZ field. The software (and its source code) used to produce the LCZ data is freely available at https://doi.org/10.5281/zenodo.6372337 (Bocher et al., 2022); the scripts and data used for the purpose of this article can be freely accessed at https://doi.org/10.5281/zenodo.7687911 (Bernard et al., 2023) and are based on the R package available at https://doi.org/10.5281/zenodo.7646866 (Gousseff, 2023).
- Published
- 2024
- Full Text
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33. On optimization of calibrations of a distributed hydrological model with spatially distributed information on snow
- Author
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D. Tiwari, M. Trudel, and R. Leconte
- Subjects
Technology ,Environmental technology. Sanitary engineering ,TD1-1066 ,Geography. Anthropology. Recreation ,Environmental sciences ,GE1-350 - Abstract
In northern cold-temperate countries, a large portion of annual streamflow is produced by spring snowmelt, which often triggers floods. It is important to have spatial information about snow variables such as snow water equivalent (SWE), which can be incorporated into hydrological models, making them more efficient tools for improved decision-making. The present research implements a unique spatial pattern metric in a multi-objective framework for calibration of hydrological models and attempts to determine whether raw SNODAS (SNOw Data Assimilation System) data can be utilized for hydrological model calibration. The spatial efficiency (SPAEF) metric is explored for spatially calibrating SWE. Different calibration experiments are performed combining Nash–Sutcliffe efficiency (NSE) for streamflow and root-mean-square error (RMSE) and SPAEF for SWE, using the Dynamically Dimensioned Search (DDS) and Pareto Archived Dynamically Dimensioned Search multi-objective optimization (PADDS) algorithms. Results of the study demonstrate that multi-objective calibration outperforms sequential calibration in terms of model performance (SWE and discharge simulations). Traditional model calibration involving only streamflow produced slightly higher NSE values; however, the spatial distribution of SWE could not be adequately maintained. This study indicates that utilizing SPAEF for spatial calibration of snow parameters improved streamflow prediction compared to the conventional practice of using RMSE for calibration. SPAEF is further implied to be a more effective metric than RMSE for both sequential and multi-objective calibration. During validation, the calibration experiment incorporating multi-objective SPAEF exhibits enhanced performance in terms of NSE and Kling–Gupta efficiency (KGE) compared to calibration experiment solely based on NSE. This observation supports the notion that incorporating SPAEF computed on raw SNODAS data within the calibration framework results in a more robust hydrological model. The novelty of this study is the implementation of SPAEF with respect to spatially distributed SWE for calibrating a distributed hydrological model.
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- 2024
- Full Text
- View/download PDF
34. Magnetic resonance imaging, water relation, gene expression and biochemical data for analysis of the effects of water stress on potato plant functioning and tuber development and quality
- Author
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Maja Musse, Sylvain Challois, Ghina Hajjar, Stéphane Quellec, Aël Radovcic, Nusrat Ali, Solenne Berardocco, Doriane Dumont, Patricia Laugier, Patrick Leconte, Aurélien Carrillo, Christophe Langrume, Lydia Bousset-Vaslin, Bastien Billiot, Franck Jamois, Carole Deleu, and Laurent Leport
- Subjects
Solanum tuberosum ,MRI ,In situ study ,Abiotic stress ,Drought ,Internal default ,Computer applications to medicine. Medical informatics ,R858-859.7 ,Science (General) ,Q1-390 - Abstract
The data presented in this paper include the original and processed MRI images acquired with a 1.5 T whole-body MRI scanner, describing the growth kinetics, spatialization and appearance of internal defaults of individual tubers of potato plants (Rosanna cultivar of Solanum tuberosum) grown in pots in a semi-controlled environment and exposed to two water regimes. The 2 conditions were a well-watered regime, in which soil moisture was maintained at 70 % of field capacity, and a variable water deficit regime, in which soil moisture was reduced to 20 % of field capacity several times during tuber growth, followed each time by a few-day period of rehydration to 70 % of field capacity. These data are supplemented by physiological, biochemical and gene expression data obtained from the leaves and tubers of additional potato plants grown under the same conditions. All these data contribute to highlight the long-term effects of water stress on plant functioning with a particular focus on the growth kinetics, spatialization and quality of potato tubers. The dataset presented here is related to the research article entitled “Growth kinetics, spatialization and quality of potato tubers monitored in situ by MRI - long-term effects of water stress”. It is made publicly available to enable extended analyzes. It is a useful resource for biologists, agronomists and breeders interested in the potato crop, as well as for researchers interested in developing new imaging methods. All data can be used to improve databases on development and quality of tubers and to feed and validate mathematical models.
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- 2024
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35. Targeted Protein Degradation: Design Considerations for PROTAC Development
- Author
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Tran, Nathan L, Leconte, Georges A, and Ferguson, Fleur M
- Subjects
Biochemistry and Cell Biology ,Biological Sciences ,Biotechnology ,Genetics ,Proteolysis ,Proteins ,compound optimization ,medicinal chemistry ,PROTAC ,proteolysis-targeting chimera ,targeted protein degradation - Abstract
Targeted protein degradation has recently gained widespread interest as both a novel therapeutic strategy and a useful tool in biomedical research. Targeted protein degraders are often sub-stoichiometric and do not require strong binding affinity for their targets, enabling access to previously inaccessible targets. Proteolysis-targeting chimeras (PROTACs) are one class of targeted protein degraders that promote degradation by recruiting a target protein to an E3-ligase complex via a heterobifunctional molecule. The modular nature of PROTACs allows for their rational design and systematic optimization. Here we suggest resources and methodologies for developing PROTAC degraders for researchers that may be new to the field. © 2022 Wiley Periodicals LLC.
- Published
- 2022
36. Pilot Study on the Relationship Between Acceptance of Collaborative Robots and Stress.
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Erika Lutin, Shirley A. Elprama, Jan Cornelis 0001, Patricia Leconte, Bart Van Doninck, Maarten Witters, Walter De Raedt, and An Jacobs
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- 2024
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37. Bioinspired Head-to-Shoulder Reference Frame Transformation for Movement-Based Arm Prosthesis Control.
- Author
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Bianca Lento, Vincent Leconte, Lucas Bardisbanian, Emilie Doat, Effie Segas, and Aymar de Rugy
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- 2024
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38. Deciphering the mechanisms involved in reduced sensitivity to azoles and fengycin lipopeptide in Venturia inaequalis
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Leconte, Aline, Jacquin, Justine, Duban, Matthieu, Deweer, Caroline, Trapet, Pauline, Laruelle, Frédéric, Farce, Amaury, Compère, Philippe, Sahmer, Karin, Fiévet, Valentin, Hoste, Alexis, Siah, Ali, Lounès-Hadj Sahraoui, Anissa, Jacques, Philippe, Coutte, François, Deleu, Magali, and Muchembled, Jérôme
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- 2024
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- View/download PDF
39. Impact of occupant behavior on optimal multi-objective solutions for the design of low-energy buildings
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El Khattabi, Sekaina, Fraisse, Gilles, Leconte, Antoine, and Rouchier, Simon
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- 2024
- Full Text
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40. “It’s okay to dream: Navigating trauma, healing, and futuring among LGBTQ + Black girls, transgender and nonbinary youth in New York State”
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Mountz, Sarah, Dill, LeConté J., Willows, Megan, and Dyett, Jordan
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- 2024
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41. Experimentation in cosmology: Intervening on the whole universe
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Leconte-Chevillard, Gauvain
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- 2024
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42. Sensorimotor adaptation of locomotor synergies to gravitational constraint
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Etienne Guillaud, Vincent Leconte, Emilie Doat, Dominique Guehl, and Jean-René Cazalets
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Biotechnology ,TP248.13-248.65 ,Physiology ,QP1-981 - Abstract
Abstract This study investigates the impact of gravity on lower limb muscle coordination during pedaling. It explores how pedaling behaviors, kinematics, and muscle activation patterns dynamically adapts to changes in gravity and resistance levels. The experiment was conducted in parabolic flights, simulating microgravity, hypergravity (1.8 g), and normogravity conditions. Participants pedaled on an ergometer with varying resistances. The goal was to identify potential changes in muscle synergies and activation strategies under different gravitational contexts. Results indicate that pedaling cadence adjusted naturally in response to both gravity and resistance changes. Cadence increased with higher gravity and decreased with higher resistance levels. Muscular activities were characterized by two synergies representing pull and push phases of pedaling. The timing of synergy activation was influenced by gravity, with a delay in activation observed in microgravity compared to other conditions. Despite these changes, the velocity profile of pedaling remained stable across gravity conditions. The findings strongly suggest that the CNS dynamically manages the shift in body weight by finely tuning muscular coordination, thereby ensuring the maintenance of a stable motor output. Furthermore, electromyography analysis suggest that neuromuscular discharge frequencies were not affected by gravity changes. This implies that the types of muscle fibers recruited during exercise in modified gravity are similar to those used in normogravity. This research has contributed to a better understanding of how the human locomotor system responds to varying gravitational conditions, shedding light on the potential mechanisms underlying astronauts’ gait changes upon returning from space missions.
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- 2024
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43. A cool runaway greenhouse without surface magma ocean
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Selsis, Franck, Leconte, Jérémy, Turbet, Martin, Chaverot, Guillaume, and Bolmont, Émeline
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- 2023
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44. French validation of the Compensatory Eating and Behaviors in Response to Alcohol Consumption Scale (CEBRACS) in a university student sample
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Ludivine Ritz, Nicolas Mauny, Pascale Leconte, and Nicolas Margas
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Food ,Drunkorexia ,Alcohol ,Eating disorders ,Scale validation ,Nutritional diseases. Deficiency diseases ,RC620-627 - Abstract
Abstract Purpose Food and Alcohol Disturbance (FAD) is characterized by the combination of problematic alcohol use and eating disorder symptoms to offset caloric intake associated with alcohol drinking and/or to enhance intoxication. The Compensatory Eating and Behaviors in Response to Alcohol Consumption Scale (CEBRACS) is a proven tool for measuring FAD, validated in English and Italian populations but never in the French population. The present study aims at validating a French version of the CEBRACS in a representative sample of university students and to determine its validity and reliability. Methods 2267 university students completed the CEBRACS and measures of eating disorders, alcohol consumption and exercise. Results An exploratory factor analysis revealed a 4-factor structure: enhancement of the effects of alcohol, dietary restraint and exercise, purging and vomiting and extreme fasting. The internal consistency for these subscales ranged from good to excellent. Correlations between the CEBRACS and eating disorders, alcohol and exercise measures revealed a good concurrent validity. No gender differences were found in the CEBRACS scores. Participants with a CEBRACS total score > 21 points were at higher risk for developing eating disorders and alcohol-related problems. Conclusions These findings highlight the reliability and validity of the French version of the CEBRACS. The distinct factors identified in the CEBRACS allow to distinguish between participants with different motives for engaging FAD behaviour and thus to prevent future development of eating and/or alcohol use disorders. The CEBRACS seems to be a relevant scale to capture FAD behaviors and thus to prevent negative and deleterious consequences. Level of evidence: Level III, evidence obtained from well-designed cohort or case–control analytic studies.
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- 2023
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45. Movement-Based Prosthesis Control with Angular Trajectory Is Getting Closer to Natural Arm Coordination
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Effie Segas, Vincent Leconte, Emilie Doat, Daniel Cattaert, and Aymar de Rugy
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artificial neural network ,human–robot interaction ,movement-based ,prosthesis control ,trans-humeral limb deficiency ,Technology - Abstract
Traditional myoelectric controls of trans-humeral prostheses fail to provide intuitive coordination of the necessary degrees of freedom. We previously showed that by using artificial neural network predictions to reconstruct distal joints, based on the shoulder posture and movement goals (i.e., position and orientation of the targeted object), participants were able to position and orient an avatar hand to grasp objects with natural arm performances. However, this control involved rapid and unintended prosthesis movements at each modification of the movement goal, impractical for real-life scenarios. Here, we eliminate this abrupt change using novel methods based on an angular trajectory, determined from the speed of stump movement and the gap between the current and the ‘goal’ distal configurations. These new controls are tested offline and online (i.e., involving participants-in-the-loop) and compared to performances obtained with a natural control. Despite a slight increase in movement time, the new controls allowed twelve valid participants and six participants with trans-humeral limb loss to reach objects at various positions and orientations without prior training. Furthermore, no usability or workload degradation was perceived by participants with upper limb disabilities. The good performances achieved highlight the potential acceptability and effectiveness of those controls for our target population.
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- 2024
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46. A coupled finite element-discrete element method for the modelling of brake squeal instabilities
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Hubert, Cédric, Attaoui, Yassine El, Leconte, Nicolas, and Massa, Franck
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- 2024
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47. Life cycle assessment to quantify the environmental performance of multi-products food processing systems such as milk fractionation: Importance of subdivision and allocation
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Guyomarc'h, Fanny, Héquet, Félicie, Le Féon, Samuel, Leconte, Nadine, Garnier-Lambrouin, Fabienne, Auberger, Julie, Malnoë, Caroline, Pénicaud, Caroline, and Gésan-Guiziou, Geneviève
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- 2024
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48. Somatostatin vs. Octreotide for Prevention of Postoperative Pancreatic Fistula The PREFIPS Randomized Clinical Trial A FRENCH 007 – ACHBT Study
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Gaujoux, Sébastien, Regimbeau, Jean-Marc, Piessen, Guillaume, Truant, Stéphanie, Foissac, Frantz, Barbier, Louise, Buc, Emmanuel, Adham, Mustapha, Fuks, David, Deguelte, Sophie, Muscari, Fabrice, Sulpice, Laurent, Vaillant, Jean-Christophe, Schwarz, Lilian, Sa Cunha, Antonio, Muzzolini, Milena, Dousset, Bertrand, Sauvanet, Alain, Abdoul, Hendy, Antomarchi, Olivier, Boudon, Marc, Carrere, Nicolas, Cauchy, François, Chebaro, Alexandre, Cherqui, Daniel, Crombe, Thibault, Cuellar, Emmanuel, D’avout, Ariane, de Ponthaud, Charles, Dubois, Clément, Durand-Zaleski, Isabelle, Dokmak, Safi, El Amrani, Mehdi, Gagniere, Johan, Gandon, Anne, Gayet, Brice, Hain, Elisabeth, Jeune, Florence, Kepenekian, Vahan, Leconte, Mahaut, Leroy, Bertrand, M’ba, Lena, Mare, Alexandru, Marques, Frédéric, Massault, Pierre-Philippe, Mensier, Alexandre, Millet, Guillaume, Navez, Julie, Perinel, Julie, Pelascani, Elise, Pezet, Denis, Piardi, Tullio, Pittau, Gabriella, Prodeau, Mathieu, Renard, Yohann, Rousseau, Géraldine, Schneck, Anne-Sophie, Slim, Karem, Suc, Bertrand, Tabchouri, Nicolas, Trechot, Boris, Tribillon, Ecoline, Tubbax, Candice, Tuech, Jean-Jacques, Tzedakis, Stylianos, Veziant, Julie, and Zerbib, Philippe
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- 2024
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49. Pembrolizumab Plus mFOLFOX7 or FOLFIRI for Microsatellite Stable/Mismatch Repair-Proficient Metastatic Colorectal Cancer: KEYNOTE-651 Cohorts B and D
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Kim, Richard, Tehfe, Mustapha, Kavan, Petr, Chaves, Jorge, Kortmansky, Jeremy S., Chen, Eric X., Lieu, Christopher H., Wong, Lucas, Fakih, Marwan, Spencer, Kristen, Zhao, Qing, Predoiu, Raluca, Li, Chenxiang, Leconte, Pierre, Adelberg, David, and Chiorean, E. Gabriela
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- 2024
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50. Pembrolizumab Plus Binimetinib With or Without Chemotherapy for MSS/pMMR Metastatic Colorectal Cancer: Outcomes From KEYNOTE-651 Cohorts A, C, and E
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Chen, Eric X., Kavan, Petr, Tehfe, Mustapha, Kortmansky, Jeremy S., Sawyer, Michael B., Chiorean, E. Gabriela, Lieu, Christopher H., Polite, Blase, Wong, Lucas, Fakih, Marwan, Spencer, Kristen, Chaves, Jorge, Li, Chenxiang, Leconte, Pierre, Adelberg, David, and Kim, Richard
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- 2024
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