936 results on '"Not, Olivier van"'
Search Results
2. Exploring the Effects of Near-Peer Teaching in Robotics Education: The Role of STEM Attitudes
- Author
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Vink, Isabelle C. de, Tolboom, Jos L. J., and Beekum, Olivier van
- Abstract
Due to technological advancements, robotics is findings its way into the classroom. However, workload for teachers is high, and teachers sometimes lack the knowledge to implement robotics education. A key factor of robotics education is peer learning, and having students (near-)peers teach them robotics could diminish workload. Therefore, this study implemented near-peer teaching in robotics education. 4 K10-11 secondary school students were teachers to 83 K5-6 primary school students. The intervention included 4 3-hour robotics lessons in Dutch schools. Primary school students completed a pre- and post-intervention questionnaire on their STEM-attitudes and near-peer teaching experience, and a report on their learning outcomes. Interaction with near-peer teachers was observed. After the lessons, a paired-samples t-test showed that students had a more positive attitude towards engineering and technology. Students also reported a positive near-peer teaching experience. Conventional content analysis showed that students experienced a gain in programming and robotics skill after the lessons, and increased conceptual understanding of robotics. The role the near peer teachers most frequently fulfilled was formative assessor. Near-peer teachers could successfully fulfil a role as an engaging information provider. This study shows that near-peer teachers can effectively teach robotics, diminishing workload for teachers. Furthermore, near-peer robotics lessons could lead to increased STEM-attitudes.
- Published
- 2023
3. Adverse Events in Anti-PD-1-Treated Adjuvant and First-Line Advanced Melanoma Patients
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Daan Jan Willem Rauwerdink, Olivier van Not, Melissa de Meza, Remco van Doorn, Jos van der Hage, A. J. M. van den Eertwegh, John B. Haanen, Maureen J. B. Aarts, Franchette W. P. J. van den Berkmortel, Christiaan U. Blank, Marye J. Boers-Sonderen, Jan Willem B. de Groot, Geke A. P. Hospers, Djura Piersma, Rozemarijn S. van Rijn, A. M. Stevense-den Boer, Astrid A. M. van der Veldt, Gerard Vreugdenhil, Michel W. J. M. Wouters, Karijn P. M. Suijkerbuijk, and Ellen Kapiteijn
- Subjects
melanoma ,immune checkpoint inhibitors ,side-effects ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Introduction: The difference in incidence and severity of anti-PD-1 therapy-related adverse events (irAEs) between adjuvant and advanced treated melanoma patients remains unclear, as no head-to-head studies have compared these groups. Methods: This multi-center cohort study analyzed melanoma patients treated with anti-PD-1 in adjuvant or advanced settings between 2015 and 2021. Comorbidities and ECOG performance status were assessed before treatment, and grade III-IV irAEs were monitored during treatment. Univariate and multivariate regression analyses were conducted to identify factors associated with irAE development. Results: A total of 1465 advanced melanoma patients and 908 resected melanoma patients received anti-PD-1 therapy. Adjuvant-treated patients were younger, with a median age of 63 years compared to 69 years in the advanced group (p < 0.01), and had a better ECOG performance status (p < 0.01). Comorbidities were seen more frequently in advanced melanoma patients than in those receiving adjuvant treatment, 76% versus 68% (p < 0.01). Grade III-IV irAEs occurred in 214 (15%) advanced treated patients and in 119 (13%) adjuvant-treated patients. Multivariate analysis showed an increased risk of severe irAE development with the presence of any comorbidity (adjusted OR 1.22, 95% CI 1.02–1.44) and ECOG status greater than 1 (adjusted OR 2.00, 95% CI 1.20–3.32). Adjuvant therapy was not associated with an increased risk of irAE development compared to advanced treatment (adjusted OR 0.95, 95% CI 0.74–1.21) after correcting for comorbidities and ECOG performance score. Anti-PD-1 therapy was halted due to toxicity (any grade irAE) more often in the adjuvant setting than in the advanced setting, 20% versus 15% (p < 0.01). Conclusions: Higher ECOG performance status and presence of any comorbidity were independently associated with an increased risk of Grade III-IV irAE in adjuvant and advanced treated melanoma patients. Patients treated in the adjuvant setting did not have an increased risk of developing severe irAEs compared to advanced melanoma patients. These findings are of clinical significance in consulting patients for adjuvant anti-PD-1 treatment.
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- 2024
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4. Safety and immunogenicity of a subtype C ALVAC-HIV (vCP2438) vaccine prime plus bivalent subtype C gp120 vaccine boost adjuvanted with MF59 or alum in healthy adults without HIV (HVTN 107): A phase 1/2a randomized trial.
- Author
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Zoe Moodie, Erica Andersen-Nissen, Nicole Grunenberg, One B Dintwe, Faatima Laher Omar, Jia J Kee, Linda-Gail Bekker, Fatima Laher, Nivashnee Naicker, Ilesh Jani, Nyaradzo M Mgodi, Portia Hunidzarira, Modulakgota Sebe, Maurine D Miner, Laura Polakowski, Shelly Ramirez, Michelle Nebergall, Simbarashe Takuva, Lerato Sikhosana, Jack Heptinstall, Kelly E Seaton, Stephen De Rosa, Carlos A Diazgranados, Marguerite Koutsoukos, Olivier Van Der Meeren, Susan W Barnett, Niranjan Kanesa-Thasan, James G Kublin, Georgia D Tomaras, M Juliana McElrath, Lawrence Corey, Kathryn Mngadi, Paul Goepfert, and HVTN 107 Protocol Team
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Medicine - Abstract
BackgroundAdjuvants are widely used to enhance and/or direct vaccine-induced immune responses yet rarely evaluated head-to-head. Our trial directly compared immune responses elicited by MF59 versus alum adjuvants in the RV144-like HIV vaccine regimen modified for the Southern African region. The RV144 trial of a recombinant canarypox vaccine vector expressing HIV env subtype B (ALVAC-HIV) prime followed by ALVAC-HIV plus a bivalent gp120 protein vaccine boost adjuvanted with alum is the only trial to have shown modest HIV vaccine efficacy. Data generated after RV144 suggested that use of MF59 adjuvant might allow lower protein doses to be used while maintaining robust immune responses. We evaluated safety and immunogenicity of an HIV recombinant canarypox vaccine vector expressing HIV env subtype C (ALVAC-HIV) prime followed by ALVAC-HIV plus a bivalent gp120 protein vaccine boost (gp120) adjuvanted with alum (ALVAC-HIV+gp120/alum) or MF59 (ALVAC-HIV+gp120/MF59) or unadjuvanted (ALVAC-HIV+gp120/no-adjuvant) and a regimen where ALVAC-HIV+gp120 adjuvanted with MF59 was used for the prime and boost (ALVAC-HIV+gp120/MF59 coadministration).Methods and findingsBetween June 19, 2017 and June 14, 2018, 132 healthy adults without HIV in South Africa, Zimbabwe, and Mozambique were randomized to receive intramuscularly: (1) 2 priming doses of ALVAC-HIV (months 0 and 1) followed by 3 booster doses of ALVAC-HIV+gp120/MF59 (months 3, 6, and 12), n = 36; (2) 2 priming doses of ALVAC-HIV (months 0 and 1) followed by 3 booster doses of ALVAC-HIV+gp120/alum (months 3, 6, and 12), n = 36; (3) 4 doses of ALVAC-HIV+gp120/MF59 coadministered (months 0, 1, 6, and 12), n = 36; or (4) 2 priming doses of ALVAC-HIV (months 0 and 1) followed by 3 booster doses of ALVAC-HIV+gp120/no adjuvant (months 3, 6, and 12), n = 24. Primary outcomes were safety and occurrence and mean fluorescence intensity (MFI) of vaccine-induced gp120-specific IgG and IgA binding antibodies at month 6.5. All vaccinations were safe and well-tolerated; increased alanine aminotransferase was the most frequent related adverse event, occurring in 2 (1.5%) participants (1 severe, 1 mild). At month 6.5, vaccine-specific gp120 IgG binding antibodies were detected in 100% of vaccinees for all 4 vaccine groups. No significant differences were seen in the occurrence and net MFI of vaccine-specific IgA responses between the ALVAC-HIV+gp120/MF59-prime-boost and ALVAC-HIV+gp120/alum-prime-boost groups or between the ALVAC-HIV+gp120/MF59-prime-boost and ALVAC-HIV+gp120/MF59 coadministration groups. Limitations were the relatively small sample size per group and lack of evaluation of higher gp120 doses.ConclusionsAlthough MF59 was expected to enhance immune responses, alum induced similar responses to MF59, suggesting that the choice between these adjuvants may not be critical for the ALVAC+gp120 regimen.Trial registrationHVTN 107 was registered with the South African National Clinical Trials Registry (DOH-27-0715-4894) and ClinicalTrials.gov (NCT03284710).
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- 2024
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5. Prospective modelling of operational offshore wind farms on the distribution of marine megafauna in the southern North Sea
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Auriane Virgili, Sophie Laran, Matthieu Authier, Ghislain Dorémus, Olivier Van Canneyt, and Jérôme Spitz
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BAG design ,counterfactuals ,distribution and abundance ,prospective impact ,species distribution models ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Intense development of Offshore Wind Farms (OWFs) has occurred in the North Sea with several more farms planned for the near future. These OWFs pose a threat to marine megafauna stressing the need to mitigate the impact of human activities. To help mitigate impacts, the Before After Gradient (BAG) design was proposed. We explored the use of the BAG method on megafauna sightings recorded at different distances from OWFs in the southern North Sea. We predicted intra-annual variability in species distribution, then correlated species distribution with the presence of operational OWFs and investigated the potential impact the operation of prospective OWFs may have on species distribution. Four patterns of intra-annual variability were predicted: species most abundant in spring, in winter, in both spring and winter, or all year round. We recommend that future OWF constructions be planned in summer and early fall to minimise impact on cetaceans and that offshore areas off northern France and Belgium be avoided to minimise impact on seabirds. Our prospective analysis predicted a decreased density for most species with the operation of prospective OWFs. Prospective approaches, using e.g. a BAG design, are paramount to inform species conservation as they can forecast the likely responses of megafauna to anthropogenic disturbances.
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- 2024
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6. Metformin Use and Long Term Outcomes following EVAR for Infrarenal Abdominal Aortic Aneurysm
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Olivier van Tongeren, Jorg de Bruin, Vinamr Rastogi, David Vecht, Klaas Ultee, Sanne Hoeks, and Hence Verhagen
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Diseases of the circulatory (Cardiovascular) system ,RC666-701 ,Surgery ,RD1-811 - Published
- 2024
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7. PelaSIG, a QGIS plugin for marine megafauna census: application to the aerial ACCOBAMS Survey Initiative dataset
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Manon Nivière, Ariane Blanchard, Oussama Jraifi, Olivier Van Canneyt, Ghislain Dorémus, Jérôme Spitz, Bruno Mansoux, Simone Panigada, and Sophie Laran
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QGIS ,plugin ,tools ,line transect survey ,spatial ecology ,GIS ,Science ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
The distribution of wild animals and their monitoring over large areas raises many logistical and technical difficulties that hinder the collection of observation data. The use of Geographic Information Systems (GIS) has increased significantly in recent years. QGIS, an open-source GIS software dedicated to the processing of geospatial data, enables the development of dedicated plugins for specific workflows. The open-source PelaSIG plugin has been developed in Python for QGIS 3 to facilitate and standardise the different steps before and after distance sampling surveys. It brings together a set of tools for survey preparation, automatic data checking, visualisation and presentation of survey effort and sightings to provide an adapted workflow. This plugin is currently designed to process dedicated aerial datasets collected with the SAMMOA software during marine megafauna surveys (i.e., marine mammals, seabirds, elasmobranchs, sea turtles, etc.). Here, we first describe the different tools already available, and then, we present an application with the dataset from the aerial survey of the ACCOBAMS Survey Initiative (ASI) conducted in 2018 over the Mediterranean Sea and using a multi-target protocol.
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- 2024
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8. Glare Removal for Astronomical Images with High Local Dynamic Range.
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Max-Olivier Van Bastelaer, Heiner Kremer, Valentin Volchkov, Jean-Claude Passy, and Bernhard Schölkopf
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- 2023
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9. Pectic homogalacturonan sensed by Bacillus acts as host associated cue to promote establishment and persistence in the rhizosphere
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Farah Boubsi, Grégory Hoff, Anthony Arguelles Arias, Sébastien Steels, Sofija Andrić, Adrien Anckaert, Romain Roulard, Augustin Rigolet, Olivier van Wuytswinkel, and Marc Ongena
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Plant biology ,Process in plant ,Plant development ,Science - Abstract
Summary: Bacillus velezensis isolates are among the most promising plant-associated beneficial bacteria used as biocontrol agents. However, various aspects of the chemical communication between the plant and these beneficials, determining root colonization ability, remain poorly described. Here we investigated the molecular basis of such interkingdom interaction occurring upon contact between Bacillus velezensis and its host via the sensing of pectin backbone homogalacturonan (HG). We showed that B. velezensis stimulates key developmental traits via a dynamic process involving two conserved pectinolytic enzymes. This response integrates transcriptional changes leading to the switch from planktonic to sessile cells, a strong increase in biofilm formation, and an accelerated sporulation dynamics while conserving the potential to efficiently produce specialized secondary metabolites. As a whole, we anticipate that this response of Bacillus to cell wall–derived host cues contributes to its establishment and persistence in the competitive rhizosphere niche and ipso facto to its activity as biocontrol agent.
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- 2023
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10. O-GlcNAcylation regulates OTX2’s proteostasis
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Wulff-Fuentes, Eugenia, Boakye, Jeffrey, Kroenke, Kaeley, Berendt, Rex R., Martinez-Morant, Carla, Pereckas, Michaela, Hanover, John A., and Olivier-Van Stichelen, Stephanie
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- 2023
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11. The use of time‐of‐flight camera to assess respiratory rates and thoracoabdominal depths in patients with chronic respiratory disease
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Olivier Van Hove, Vasileios Andrianopoulos, Ali Dabach, Olivier Debeir, Alain Van Muylem, Dimitri Leduc, Alexandre Legrand, Rudy Ercek, Véronique Feipel, and Bruno Bonnechère
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assessment ,breathing ,Kinect sensor ,respiratory diseases ,validation ,Diseases of the respiratory system ,RC705-779 - Abstract
Abstract Introduction Over the last 5 years, the analysis of respiratory patterns presents a growing usage in clinical and research purposes, but there is still currently a lack of easy‐to‐use and affordable devices to perform such kind of evaluation. Objectives The aim of this study is to validate a new specifically developed method, based on Kinect sensor, to assess respiratory patterns against spirometry under various conditions. Methods One hundred and one participants took parts in one of the three validations studies. Twenty‐five chronic respiratory disease patients (14 with chronic obstructive pulmonary disease (COPD) [65 ± 10 years old, FEV1 = 37 (15% predicted value), VC = 62 (20% predicted value)], and 11 with lung fibrosis (LF) [64 ± 14 years old, FEV1 = 55 (19% predicted value), VC = 62 (20% predicted value)]) and 76 healthy controls (HC) were recruited. The correlations between the signal of the Kinect (depth and respiratory rate) and the spirometer (tidal volume and respiratory rate) were computed in part 1. We then included 66 HC to test the ability of the system to detect modifications of respiratory patterns induced by various conditions known to modify respiratory pattern (cognitive load, inspiratory load and combination) in parts 2 and 3. Results There is a strong correlation between the depth recorded by the Kinect and the tidal volume recorded by the spirometer: r = 0.973 for COPD patients, r = 0.989 for LF patients and r = 0.984 for HC. The Kinect is able to detect changes in breathing patterns induced by different respiratory disturbance conditions, gender and oral task. Conclusions Measurements performed with the Kinect sensors are highly correlated with the spirometer in HC and patients with COPD and LF. Kinect is also able to assess respiratory patterns under various loads and disturbances. This method is affordable, easy to use, fully automated and could be used in the current clinical context. Respiratory patterns are important to assess in daily clinics. However, there is currently no affordable and easy‐to‐use tool to evaluate these parameters in clinics. We validated a new system to assess respiratory patterns using the Kinect sensor in patients with chronic respiratory diseases.
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- 2023
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12. Synthetic Data Generation of Many-to-Many Datasets via Random Graph Generation.
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Kai Xu, Georgi Ganev, Emile Joubert, Rees Davison, Olivier Van Acker, and Luke Robinson
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- 2023
13. Saving Brian's privacy: the perils of privacy exposure through reverse DNS.
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Olivier van der Toorn, Roland van Rijswijk-Deij, Raffaele Sommese, Anna Sperotto, and Mattijs Jonker
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- 2022
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14. Publishing Cultural Heritage Collections of Ghent with Linked Data Event Streams
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Van de Vyvere, Brecht, D’Huynslager, Olivier Van, Atauil, Achraf, Segers, Maarten, Van Campe, Leen, Vandekeybus, Niels, Teugels, Sofie, Saenko, Alina, Pauwels, Pieter-Jan, Colpaert, Pieter, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Garoufallou, Emmanouel, editor, Ovalle-Perandones, María-Antonia, editor, and Vlachidis, Andreas, editor
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- 2022
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15. Non-Nutritive Sweeteners Inhibit Key Multidrug Efflux Transporters
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Danner, Laura, primary and Stichelen, Stephanie Olivier-Van, additional
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- 2024
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16. The diverging role of O-GlcNAc Transferase in corticotroph and somatotroph adenomas
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Gonzalez, Roel, primary, Massman, Logan, additional, Ho, Sophia, additional, Luna, Sarai, additional, Cheok, Stephanie, additional, Liang, Brandon, additional, Mrachek, Kelly, additional, Coss, Dylan, additional, Ioachimescu, Adriana G, additional, Zwagerman, Nathan, additional, and Stichelen, Stephanie Olivier-Van, additional
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- 2024
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17. Deep ocean drivers better explain habitat preferences of sperm whales Physeter macrocephalus than beaked whales in the Bay of Biscay
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Auriane Virgili, Valentin Teillard, Ghislain Dorémus, Timothy E. Dunn, Sophie Laran, Mark Lewis, Maite Louzao, José Martínez-Cedeira, Emeline Pettex, Leire Ruiz, Camilo Saavedra, M. Begoña Santos, Olivier Van Canneyt, José Antonio Vázquez Bonales, and Vincent Ridoux
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Medicine ,Science - Abstract
Abstract Species Distribution Models are commonly used with surface dynamic environmental variables as proxies for prey distribution to characterise marine top predator habitats. For oceanic species that spend lot of time at depth, surface variables might not be relevant to predict deep-dwelling prey distributions. We hypothesised that descriptors of deep-water layers would better predict the deep-diving cetacean distributions than surface variables. We combined static variables and dynamic variables integrated over different depth classes of the water column into Generalised Additive Models to predict the distribution of sperm whales Physeter macrocephalus and beaked whales Ziphiidae in the Bay of Biscay, eastern North Atlantic. We identified which variables best predicted their distribution. Although the highest densities of both taxa were predicted near the continental slope and canyons, the most important variables for beaked whales appeared to be static variables and surface to subsurface dynamic variables, while for sperm whales only surface and deep-water variables were selected. This could suggest differences in foraging strategies and in the prey targeted between the two taxa. Increasing the use of variables describing the deep-water layers would provide a better understanding of the oceanic species distribution and better assist in the planning of human activities in these habitats.
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- 2022
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18. Exploring the effects of near-peer teaching in robotics education: The role of STEM attitudes
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Isabelle C. de Vink, Jos L. J. Tolboom, and Olivier van Beekum
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Robotics ,programming ,STEM ,Computational Thinking ,peer interaction ,Special aspects of education ,LC8-6691 - Abstract
Due to technological advancements, robotics is findings its way into the classroom. However, workload for teachers is high, and teachers sometimes lack the knowledge to implement robotics education. A key factor of robotics education is peer learning, and having students (near-)peers teach them robotics could diminish workload. Therefore, this study implemented near-peer teaching in robotics education. 4 K10-11 secondary school students were teachers to 83 K5-6 primary school students. The intervention included 4 3-hour robotics lessons in Dutch schools. Primary school students completed a pre- and post-intervention questionnaire on their STEM-attitudes and near-peer teaching experience, and a report on their learning outcomes. Interaction with near-peer teachers was observed. After the lessons, a paired-samples t-test showed that students had a more positive attitude towards engineering and technology. Students also reported a positive near-peer teaching experience. Conventional content analysis showed that students experienced a gain in programming and robotics skill after the lessons, and increased conceptual understanding of robotics. The role the near peer teachers most frequently fulfilled was formative assessor. Near-peer teachers could successfully fulfil a role as an engaging information provider. This study shows that near-peer teachers can effectively teach robotics, diminishing workload for teachers. Furthermore, near-peer robotics lessons could lead to increased STEM-attitudes.
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- 2022
- Full Text
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19. Reduced anticoagulation targets in extracorporeal life support (RATE): study protocol for a randomized controlled trial
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Olivier van Minnen, Annemieke Oude Lansink-Hartgring, Bas van den Boogaard, Judith van den Brule, Pierre Bulpa, Jeroen J. H. Bunge, Thijs S. R. Delnoij, Carlos V. Elzo Kraemer, Marijn Kuijpers, Bernard Lambermont, Jacinta J. Maas, Jesse de Metz, Isabelle Michaux, Ineke van de Pol, Marcel van de Poll, S. Jorinde Raasveld, Matthias Raes, Dinis dos Reis Miranda, Erik Scholten, Olivier Simonet, Fabio S. Taccone, Frederic Vallot, Alexander P. J. Vlaar, and Walter M. van den Bergh
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ECMO ,Anticoagulation ,Complications ,Medicine (General) ,R5-920 - Abstract
Abstract Background Although life-saving in selected patients, ECMO treatment still has high mortality which for a large part is due to treatment-related complications. A feared complication is ischemic stroke for which heparin is routinely administered for which the dosage is usually guided by activated partial thromboplastin time (aPTT). However, there is no relation between aPTT and the rare occurrence of ischemic stroke (1.2%), but there is a relation with the much more frequent occurrence of bleeding complications (55%) and blood transfusion. Both are strongly related to outcome. Methods We will conduct a three-arm non-inferiority randomized controlled trial, in adult patients treated with ECMO. Participants will be randomized between heparin administration with a target of 2–2.5 times baseline aPTT, 1.5–2 times baseline aPTT, or low molecular weight heparin guided by weight and renal function. Apart from anticoagulation targets, treatment will be according to standard care. The primary outcome parameter is a combined endpoint consisting of major bleeding including hemorrhagic stroke, severe thromboembolic complications including ischemic stroke, and mortality at 6 months. Discussion We hypothesize that with lower anticoagulation targets or anticoagulation with LMWH during ECMO therapy, patients will have fewer hemorrhagic complications without an increase in thromboembolic complication or a negative effect on their outcome. If our hypothesis is confirmed, this study could lead to a change in anticoagulation protocols and a better outcome for patients treated with ECMO. Trial registration ClinicalTrials.gov NCT04536272 . Registered on 2 September 2020. Netherlands Trial Register NL7969
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- 2022
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20. Gaining insights into dwelling characteristics using machine learning for policy making on nearly zero-energy buildings with the use of smart meter and weather data
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Teo Čurčić, Rajeev R. Kalloe, Merel A. Kreszner, Olivier van Luijk, Santiago Puertas Puchol, Emilio Caba Batuecas, and Tadeo B. Salcedo Rahola
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smart meter ,net-zero energy building ,supervised machine learning ,classification ,lstm ,Technology ,Economic growth, development, planning ,HD72-88 - Abstract
Machine learning models have proven to be reliable methods in classification tasks. However, little research has been conducted on the classification of dwelling characteristics based on smart meter and weather data before. Gaining insights into dwelling characteristics, which comprise of the type of heating system used, the number of inhabitants, and the number of solar panels installed, can be helpful in creating or improving the policies to create new dwellings at nearly zero-energy standard. This paper compares different supervised machine learning algorithms, namely Logistic Regression, Support Vector Machine, K-Nearest Neighbor, and Long-short term memory, and methods used to correctly implement these algorithms. These methods include data pre-processing, model validation, and evaluation. Smart meter data, which was used to train several machine learning algorithms, was provided by Groene Mient. The models that were generated by the algorithms were compared on their performance. The results showed that the Long-short term memory performed the best with 96% accuracy. Cross Validation was used to validate the models, where 80% of the data was used for training purposes and 20% was used for testing purposes. Evaluation metrics were used to produce classification reports, which indicates that the Long-short term memory outperforms the compared models on the evaluation metrics for this specific problem.
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- 2022
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21. Medico-surgical management of the spastic equinovarus foot deformity in adults: A retrospective series of 622 patients
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Thierry Deltombe, Thomas Gavray, Olivier Van Roy, Delphine Wautier, and Thierry Gustin
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equinovarus foot ,motor nerve block ,muscle spasticity ,neuro-orthopedics ,neurotomy ,Orthopedic surgery ,RD701-811 ,Medicine - Abstract
Objective: This study aimed to determine the frequency of spastic equinovarus foot (SEF) treatments. Materials and Methods: the medical files of 622 patients treated for SEF were reviewed. Results: SEF resulted from stroke in 66%. The most frequent pattern was equinovarus in 56%, knee recurvatum in 55%, and claw toes in 41%. Patients benefited from surgical treatment in 59%, including neurotomy in 22%, tendon surgery in 12%, and a combined surgery in 25%. Conclusion: Surgery was performed in 59% of the cases. The type of treatment was influenced by the preoperative diagnostic nerve block assessment.
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- 2022
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22. ANYway: Measuring the Amplification DDoS Potential of Domains.
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Olivier van der Toorn, Johannes Krupp, Mattijs Jonker, Roland van Rijswijk-Deij, Christian Rossow, and Anna Sperotto
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- 2021
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23. Publishing Cultural Heritage Collections of Ghent with Linked Data Event Streams.
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Brecht Van de Vyvere, Olivier Van D'Huynslager, Achraf Atauil, Maarten Segers, Leen Van Campe, Niels Vandekeybus, Sofie Teugels, Alina Saenko, Pieter-Jan Pauwels, and Pieter Colpaert
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- 2021
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24. Electron density in a non-thermal atmospheric discharge in contact with water and the effect of water temperature on plasma-water interactions.
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Rooij, Olivier van, Ahlborn, Olivia, and Sobota, Ana
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ATMOSPHERIC density , *WATER temperature , *TEMPERATURE effect , *ELECTRON density , *THERMAL plasmas , *PLASMA density , *ELECTRON temperature - Abstract
In this study the electron density of an atmospheric plasma generated between a pin electrode and a water surface is measured by determining the Stark broadening of H α and H β emission lines. Comparable values for the electron density are achieved using the H α and H β broadening obtained in separate measurements. During the temporally evolving system, increasing electron densities are measured of 0.5 − 3 ⋅ 10 15 cm−3 during the plasma treatment of 5–10 min. The effect of the water temperature on plasma-water interaction is investigated by heating the water to ≈ 70 ∘ C prior to the measurements. This resulted in higher gas temperatures during the discharge up to 2500 K and 4000 K for positively and negatively pulsed discharge, respectively. Furthermore, an earlier increase of electron density and conductivity of the water is measured for the preheated experiments. The humidity of the gas is likely to be an important parameter causing the observed results. [ABSTRACT FROM AUTHOR]
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- 2024
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25. Arabidopsis transcription factor ANAC102 predominantly expresses a nuclear protein and acts as a negative regulator of methyl viologen-induced oxidative stress responses.
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Luo, Xiaopeng, Jiang, Xinqiang, Schmitt, Vivian, Kulkarni, Shubhada R, Tran, Huy Cuong, Kacprzak, Sylwia M, Breusegem, Frank Van, Aken, Olivier Van, Vandepoele, Klaas, and Clercq, Inge De
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TRANSCRIPTION factors ,GENE regulatory networks ,SECOND messengers (Biochemistry) ,NUCLEAR proteins ,PHOTOOXIDATIVE stress ,CHLOROPLASTS - Abstract
Plants, being sessile organisms, constantly need to respond to environmental stresses, often leading to the accumulation of reactive oxygen species (ROS). While ROS can be harmful, they also act as second messengers guiding plant growth and stress responses. Because chloroplasts are sensitive to environmental changes and are both a source and a target of ROS during stress conditions, they are important in conveying environmental changes to the nucleus, where acclimation responses are coordinated to maintain organellar and overall cellular homeostasis. ANAC102 has previously been established as a regulator of β-cyclocitral-mediated chloroplast-to-nucleus signaling, protecting plants against photooxidative stress. However, debates persist about where ANAC102 is located—in chloroplasts or in the nucleus. Our study, utilizing the genomic ANAC102 sequence driven by its native promoter, establishes ANAC102 primarily as a nuclear protein, lacking a complete N-terminal chloroplast-targeting peptide. Moreover, our research reveals the sensitivity of plants overexpressing ANAC102 to severe superoxide-induced chloroplast oxidative stress. Transcriptome analysis unraveled a dual role of ANAC102 in negatively and positively regulating genome-wide transcriptional responses to chloroplast oxidative stress. Through the integration of published data and our own study, we constructed a comprehensive transcriptional network, which suggests that ANAC102 exerts direct and indirect control over transcriptional responses through downstream transcription factor networks, providing deeper insights into the ANAC102-mediated regulatory landscape during oxidative stress. [ABSTRACT FROM AUTHOR]
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- 2024
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26. Adverse Events in Anti-PD-1-Treated Adjuvant and First-Line Advanced Melanoma Patients.
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Rauwerdink, Daan Jan Willem, Not, Olivier van, de Meza, Melissa, Doorn, Remco van, Hage, Jos van der, Eertwegh, A. J. M. van den, Haanen, John B., Aarts, Maureen J. B., Berkmortel, Franchette W. P. J. van den, Blank, Christiaan U., Boers-Sonderen, Marye J., Groot, Jan Willem B. de, Hospers, Geke A. P., Piersma, Djura, van Rijn, Rozemarijn S., Stevense-den Boer, A. M., Veldt, Astrid A. M. van der, Vreugdenhil, Gerard, Wouters, Michel W. J. M., and Suijkerbuijk, Karijn P. M.
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RISK assessment , *DRUG side effects , *MELANOMA , *SURGERY , *PATIENTS , *IMMUNOTHERAPY , *SCIENTIFIC observation , *CANCER patients , *MULTIVARIATE analysis , *DESCRIPTIVE statistics , *RETROSPECTIVE studies , *ADJUVANT chemotherapy , *IMMUNE checkpoint inhibitors , *LONGITUDINAL method , *ODDS ratio , *RESEARCH , *STATISTICS , *CONFIDENCE intervals , *COMORBIDITY - Abstract
Simple Summary: This nationwide cohort study evaluated the incidence and severity of immune-related adverse events (irAEs) in melanoma patients receiving adjuvant versus advanced anti-PD-1 therapy. A total of 1465 advanced melanoma patients and 908 adjuvant-treated patients were included. Patients in the adjuvant group were younger, had superior ECOG performance status, and had fewer comorbidities compared to those in the advanced group. No significant difference was observed in the incidence of grade III-IV irAEs between the two groups. However, higher ECOG status (>1) and the presence of any comorbidities were independently associated with an increased risk of irAE development across both treatment settings. Although adjuvant therapy was not linked to a heightened risk of severe irAEs compared to advanced therapy, it was more frequently discontinued due to toxicity in the adjuvant group. These findings provide critical insights for informing patient consultations regarding adjuvant anti-PD-1 treatment. Introduction: The difference in incidence and severity of anti-PD-1 therapy-related adverse events (irAEs) between adjuvant and advanced treated melanoma patients remains unclear, as no head-to-head studies have compared these groups. Methods: This multi-center cohort study analyzed melanoma patients treated with anti-PD-1 in adjuvant or advanced settings between 2015 and 2021. Comorbidities and ECOG performance status were assessed before treatment, and grade III-IV irAEs were monitored during treatment. Univariate and multivariate regression analyses were conducted to identify factors associated with irAE development. Results: A total of 1465 advanced melanoma patients and 908 resected melanoma patients received anti-PD-1 therapy. Adjuvant-treated patients were younger, with a median age of 63 years compared to 69 years in the advanced group (p < 0.01), and had a better ECOG performance status (p < 0.01). Comorbidities were seen more frequently in advanced melanoma patients than in those receiving adjuvant treatment, 76% versus 68% (p < 0.01). Grade III-IV irAEs occurred in 214 (15%) advanced treated patients and in 119 (13%) adjuvant-treated patients. Multivariate analysis showed an increased risk of severe irAE development with the presence of any comorbidity (adjusted OR 1.22, 95% CI 1.02–1.44) and ECOG status greater than 1 (adjusted OR 2.00, 95% CI 1.20–3.32). Adjuvant therapy was not associated with an increased risk of irAE development compared to advanced treatment (adjusted OR 0.95, 95% CI 0.74–1.21) after correcting for comorbidities and ECOG performance score. Anti-PD-1 therapy was halted due to toxicity (any grade irAE) more often in the adjuvant setting than in the advanced setting, 20% versus 15% (p < 0.01). Conclusions: Higher ECOG performance status and presence of any comorbidity were independently associated with an increased risk of Grade III-IV irAE in adjuvant and advanced treated melanoma patients. Patients treated in the adjuvant setting did not have an increased risk of developing severe irAEs compared to advanced melanoma patients. These findings are of clinical significance in consulting patients for adjuvant anti-PD-1 treatment. [ABSTRACT FROM AUTHOR]
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- 2024
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27. Study design and rationale of the pAtients pResenTing with cOngenital heaRt dIseAse Register (ARTORIA‐R)
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Christoph Sinning, Elvin Zengin, Gerhard‐Paul Diller, Francesco Onorati, María‐Angeles Castel, Thibault Petit, Yih‐Sharng Chen, Mauro Lo Rito, Carmelina Chiarello, Romain Guillemain, Karine Nubret‐Le Coniat, Christina Magnussen, Dorit Knappe, Peter Moritz Becher, Benedikt Schrage, Jacqueline M. Smits, Andreas Metzner, Christoph Knosalla, Felix Schoenrath, Oliver Miera, Mi‐Young Cho, Alexander Bernhardt, Jessica Weimann, Alina Goßling, Amedeo Terzi, Antonio Amodeo, Sara Alfieri, Emanuela Angeli, Luca Ragni, Carlo Pace Napoleone, Gino Gerosa, Nicola Pradegan, Inez Rodrigus, Julia Dumfarth, Michel dePauw, Katrien François, Olivier Van Caenegem, Arnaut Ancion, Johan Van Cleemput, Davor Miličić, Ajay Moza, Peter Schenker, Josef Thul, Michael Steinmetz, Gregor Warnecke, Fabio Ius, Susanne Freyt, Murat Avsar, Tim Sandhaus, Assad Haneya, Sandra Eifert, Diyar Saeed, Michael Borger, Henryk Welp, László Ablonczy, Bastian Schmack, Arjang Ruhparwar, Shiho Naito, Xiaoqin Hua, Nina Fluschnik, Moritz Nies, Laura Keil, Juliana Senftinger, Djemail Ismaili, Shinwan Kany, Dora Csengeri, Massimo Cardillo, Alessandra Oliveti, Giuseppe Faggian, Richard Dorent, Carine Jasseron, Alicia Pérez Blanco, José Manuel Sobrino Márquez, Raquel López‐Vilella, Ana García‐Álvarez, María Luz Polo López, Alvaro Gonzalez Rocafort, Óscar González Fernández, Raquel Prieto‐Arevalo, Eduardo Zatarain‐Nicolás, Katrien Blanchart, Aude Boignard, Pascal Battistella, Soulef Guendouz, Lucile Houyel, Marylou Para, Erwan Flecher, Arnaud Gay, Éric Épailly, Camille Dambrin, Kaitlyn Lam, Cally Ho Ka‐lai, Yang Hyun Cho, Jin‐Oh Choi, Jae‐Joong Kim, Louise Coats, David Steven Crossland, Lisa Mumford, Samer Hakmi, Cumaraswamy Sivathasan, Larissa Fabritz, Stephan Schubert, Jan Gummert, Michael Hübler, Peter Jacksch, Andreas Zuckermann, Günther Laufer, Helmut Baumgartner, Alessandro Giamberti, Hermann Reichenspurner, and Paulus Kirchhof
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Adults with congenital heart disease ,Heart transplantation ,Heart failure ,Ventricular assist device ,Arrhythmia ,Lung transplantation ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Aim Due to improved therapy in childhood, many patients with congenital heart disease reach adulthood and are termed adults with congenital heart disease (ACHD). ACHD often develop heart failure (HF) as a consequence of initial palliative surgery or complex anatomy and subsequently require advanced HF therapy. ACHD are usually excluded from trials evaluating heart failure therapies, and in this context, more data about heart failure trajectories in ACHD are needed to guide the management of ACHD suffering from HF. Methods and results The pAtients pResenTing with cOngenital heaRt dIseAse Register (ARTORIA‐R) will collect data from ACHD evaluated or listed for heart or heart‐combined organ transplantation from 16 countries in Europe and the Asia/Pacific region. We plan retrospective collection of data from 1989–2020 and will include patients prospectively. Additional organizations and hospitals in charge of transplantation of ACHD will be asked in the future to contribute data to the register. The primary outcome is the combined endpoint of delisting due to clinical worsening or death on the waiting list. The secondary outcome is delisting due to clinical improvement while on the waiting list. All‐cause mortality following transplantation will also be assessed. The data will be entered into an electronic database with access to the investigators participating in the register. All variables of the register reflect key components important for listing of the patients or assessing current HF treatment. Conclusion The ARTORIA‐R will provide robust information on current management and outcomes of adults with congenital heart disease suffering from advanced heart failure.
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- 2021
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28. The relation between computational thinking and logical thinking in the context of robotics education
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Kim Veenman, Jos L. J. Tolboom, and Olivier van Beekum
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computational thinking test (CTT) ,robotics ,test of logical thinking test (TOLT) ,measure and analysis ,science technology engineering mathematics (STEM) ,Education (General) ,L7-991 - Abstract
Computational thinking is a popular student skill on a steep rise today. Nevertheless, the assessment of this skill is a matter of contention. This pilot study examines whether computational and logical thinking are related. Therefore, we investigated the effect of a robotics course concerning logical thinking and computational thinking on 14-year-old Dutch students. Thirty-five students were pre-tested to assess their logical thinking and post-tested for their logical thinking and their computational thinking. The intervention group (N = 11) followed a robotics course between the pre- and post-test. This study's results show a significant positive correlation between computational and logical thinking. This study, with small sample size, does not show the effect of the robotics course on either logical or computational thinking.
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- 2022
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29. Publishing Cultural Heritage Collections of Ghent with Linked Data Event Streams
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Van de Vyvere, Brecht, primary, D’Huynslager, Olivier Van, additional, Atauil, Achraf, additional, Segers, Maarten, additional, Van Campe, Leen, additional, Vandekeybus, Niels, additional, Teugels, Sofie, additional, Saenko, Alina, additional, Pauwels, Pieter-Jan, additional, and Colpaert, Pieter, additional
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- 2022
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30. Evolved and plastic gene expression in adaptation to a novel niche
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Steward, Rachel A., primary, Ortega Giménez, Jesús, additional, Choudhary, Shruti, additional, Yi, Su, additional, Aken, Olivier Van, additional, and Runemark, Anna, additional
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- 2024
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31. Studying the O-GlcNAcome of human placentas using banked tissue samples
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Luna, Sarai, primary, Malard, Florian, additional, Pereckas, Michaela, additional, Aoki, Mayumi, additional, Aoki, Kazahiro, additional, and Olivier-Van Stichelen, Stephanie, additional
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- 2024
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32. A Case of Identity: Detection of Suspicious IDN Homograph Domains Using Active DNS Measurements.
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Ramin Yazdani, Olivier van der Toorn, and Anna Sperotto
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- 2020
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33. TXTing 101: Finding Security Issues in the Long Tail of DNS TXT Records.
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Olivier van der Toorn, Roland van Rijswijk-Deij, Tobias Fiebig, Martina Lindorfer, and Anna Sperotto
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- 2020
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34. A blueprint of the topology and mechanics of the human ovary for next-generation bioengineering and diagnosis
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Emna Ouni, Alexis Peaucelle, Kalina T. Haas, Olivier Van Kerk, Marie-Madeleine Dolmans, Timo Tuuri, Marjut Otala, and Christiani A. Amorim
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Science - Abstract
Although the first dissection of the human ovary dates back to the 17th century, its characterization is still limited. Here, the authors have unraveled a unique biophysical and topological phenotype of reproductive-age tissue, bridging biophysics and female fertility and providing a blueprint for the artificial ovary.
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- 2021
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35. Editorial: Glycotherapeutics: Design, synthesis, function and biomedical application of agents emerging from glycochemistry and glycobiology
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M. Osman Sheikh, Chantelle J. Capicciotti, and Stéphanie Olivier-Van Stichelen
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glycans ,glycomics ,chemical biology ,glycoengineering ,carbohydrates ,Biology (General) ,QH301-705.5 - Published
- 2022
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36. Simulation and experimental verification of ambient neutron doses in a pencil beam scanning proton therapy room as a function of treatment plan parameters
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Olivier Van Hoey, Liliana Stolarczyk, Jan Lillhök, Linda Eliasson, Natalia Mojzeszek, Malgorzata Liszka, Ali Alkhiat, Vladimir Mares, François Trompier, Sebastian Trinkl, Immaculada Martínez-Rovira, Maite Romero-Expósito, Carles Domingo, Ondrej Ploc, Roger Harrison, and Pawel Olko
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Proton therapy ,Pencil beam scanned proton therapy ,Neutron doses ,Monte Carlo simulations ,Out-of-field neutron doses in radiation therapy ,Neutron measurements ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Out-of-field patient doses in proton therapy are dominated by neutrons. Currently, they are not taken into account by treatment planning systems. There is an increasing need to include out-of-field doses in the dose calculation, especially when treating children, pregnant patients, and patients with implants. In response to this demand, this work presents the first steps towards a tool for the prediction of out-of-field neutron doses in pencil beam scanning proton therapy facilities. As a first step, a general Monte Carlo radiation transport model for simulation of out-of-field neutron doses was set up and successfully verified by comparison of simulated and measured ambient neutron dose equivalent and neutron fluence energy spectra around a solid water phantom irradiated with a variation of different treatment plan parameters. Simulations with the verified model enabled a detailed study of the variation of the neutron ambient dose equivalent with field size, range, modulation width, use of a range shifter, and position inside the treatment room. For future work, it is planned to use this verified model to simulate out-of-field neutron doses inside the phantom and to verify the simulation results by comparison with previous in-phantom measurement campaigns. Eventually, these verified simulations will be used to build a library and a corresponding tool to allow assessment of out-of-field neutron doses at pencil beam scanning proton therapy facilities.
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- 2022
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37. EpyNN: Educational python for Neural Networks
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Florian Malard, Laura Danner, Emilie Rouzies, Jesse G. Meyer, Ewen Lescop, and Stéphanie Olivier-Van Stichelen
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Python ,Education ,Machine Learning ,Neural Networks ,Computer software ,QA76.75-76.765 - Abstract
Artificial Neural Networks (ANNs) have achieved unequaled performance for numerous problems in many areas of Science, Business, Public Policy, and more. While experts are familiar with performance-oriented software and underlying theory, ANNs are difficult to comprehend for non-experts because it requires skills in programming, background in mathematics and knowledge of terminology and concepts. In this work, we release EpyNN, an educational Python resource meant for a public willing to understand key concepts and practical implementation of scalable ANN architectures from concise, homogeneous and idiomatic source code. EpyNN contains an educational Application Programming Interface (API), educational workflows from data preparation to ANN training and a documentation website setting side-by-side code, mathematics, graphical representation and text to facilitate learning and provide teaching material. Overall, EpyNN provides basics in Python for individuals who wish to learn, teach or develop from scratch.
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- 2022
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38. Neutron Radiation Dose Measurements in a Scanning Proton Therapy Room: Can Parents Remain Near Their Children During Treatment?
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Vladimir Mares, Jad Farah, Marijke De Saint-Hubert, Szymon Domański, Carles Domingo, Martin Dommert, Magdalena Kłodowska, Katarzyna Krzempek, Michał Kuć, Immaculada Martínez-Rovira, Edyta Michaś, Natalia Mojżeszek, Łukasz Murawski, Ondrej Ploc, Maite Romero-Expósito, Marco Tisi, François Trompier, Olivier Van Hoey, Laurent Van Ryckeghem, Marek Wielunski, Roger M. Harrison, Liliana Stolarczyk, and Pawel Olko
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scanning proton therapy ,anthropomorphic pediatric phantom ,secondary neutrons ,active neutron monitors ,ambient dose equivalent ,clinical conditions ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
PurposeThis study aims to characterize the neutron radiation field inside a scanning proton therapy treatment room including the impact of different pediatric patient sizes.Materials and MethodsWorking Group 9 of the European Radiation Dosimetry Group (EURADOS) has performed a comprehensive measurement campaign to measure neutron ambient dose equivalent, H*(10), at eight different positions around 1-, 5-, and 10-year-old pediatric anthropomorphic phantoms irradiated with a simulated brain tumor treatment. Several active detector systems were used.ResultsThe neutron dose mapping within the gantry room showed that H*(10) values significantly decreased with distance and angular deviation with respect to the beam axis. A maximum value of about 19.5 µSv/Gy was measured along the beam axis at 1 m from the isocenter for a 10-year-old pediatric phantom at 270° gantry angle. A minimum value of 0.1 µSv/Gy was measured at a distance of 2.25 m perpendicular to the beam axis for a 1-year-old pediatric phantom at 140° gantry angle.The H*(10) dependence on the size of the pediatric patient was observed. At 270° gantry position, the measured neutron H*(10) values for the 10-year-old pediatric phantom were up to 20% higher than those measured for the 5-year-old and up to 410% higher than for the 1-year-old phantom, respectively.ConclusionsUsing active neutron detectors, secondary neutron mapping was performed to characterize the neutron field generated during proton therapy of pediatric patients. It is shown that the neutron ambient dose equivalent H*(10) significantly decreases with distance and angle with respect to the beam axis. It is reported that the total neutron exposure of a person staying at a position perpendicular to the beam axis at a distance greater than 2 m from the isocenter remains well below the dose limit of 1 mSv per year for the general public (recommended by the International Commission on Radiological Protection) during the entire treatment course with a target dose of up to 60 Gy. This comprehensive analysis is key for general neutron shielding issues, for example, the safe operation of anesthetic equipment. However, it also enables the evaluation of whether it is safe for parents to remain near their children during treatment to bring them comfort. Currently, radiation protection protocols prohibit the occupancy of the treatment room during beam delivery.
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- 2022
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39. Comparison of Different Ex-Vivo Preservation Strategies on Cardiac Metabolism in an Animal Model of Donation after Circulatory Death
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Stefano Mastrobuoni, Manuel Johanns, Martial Vergauwen, Gwen Beaurin, Mark Rider, Pierre Gianello, Alain Poncelet, and Olivier Van Caenegem
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heart transplant ,donation after circulatory death ,ex-vivo machine perfusion ,Medicine - Abstract
Transplantation of heart following donation after circulatory death (DCD) was recently introduced into clinical practice. Ex vivo reperfusion following DCD and retrieval is deemed necessary in order to evaluate the recovery of cardiac viability after the period of warm ischemia. We tested the effect of four different temperatures (4 °C—18 °C—25 °C—35 °C) on cardiac metabolism during 3-h ex vivo reperfusion in a porcine model of DCD heart. We observed a steep fall in high-energy phosphate (ATP) concentrations in the myocardial tissue at the end of the warm ischemic time and only limited regeneration during reperfusion. Lactate concentration in the perfusate increased rapidly during the first hour of reperfusion and slowly decreased afterward. However, the temperature of the solution does not seem to have an effect on either ATP or lactate concentration. Furthermore, all cardiac allografts showed a significant weight increase due to cardiac edema, regardless of the temperature.
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- 2023
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40. SI-M/O: Swarm Intelligence-based Modeling and Optimization of complex synthesis reaction processes.
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Min Wu, Ulderico Di Caprio, Furkan Elmaz, Florence H. Vermeire, Bert Metten, Olivier Van Der Ha, Dries De Clercq, Siegfried Mercelis, Peter Hellinckx, Leen Braeken, and Mumin Enis Leblebici
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- 2023
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41. A bootstrap-based approach to combine individual-based forest growth models and remotely sensed data.
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Fortin, Mathieu, Lier, Olivier van, Côté, Jean-François, Erdle, Heidi, and White, Joanne
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TAIGAS ,LANDSAT satellites - Abstract
Combining forest growth models with remotely sensed data is possible under a generalized hierarchical model-based (GHMB) inferential framework. This implies the existence of two submodels: the growth model itself (|$\mathcal{M}_{1}$|) and a second submodel that links the growth predictions to some remotely sensed variables (|$\mathcal{M}_{2}$|). Analytical GHMB estimators are available to fit submodel |$\mathcal{M}_{2}$| and account for the uncertainty stemming from submodel |$\mathcal{M}_{1}$| , i.e. the growth model. However, when the growth model is individual based, it is usually too complex to be differentiated with respect to its parameters. As a result, the analytical GHMB estimators cannot be used. In this study, we developed a bootstrap approach for the GHMB inferential framework in order to combine individual-based forest growth models with remotely sensed data. Through simulation studies, we showed that the bootstrap estimators were nearly unbiased when both submodels were linear. The estimator of the parameter estimates remained nearly unbiased when submodel |$\mathcal{M}_{1}$| became complex, i.e. non-differentiable, and submodel |$\mathcal{M}_{2}$| was nonlinear with heterogeneous variances and correlated error terms. The variance estimator showed some biases but these were relatively small. We further demonstrated through a real-world case study that the predictions of a complex individual-based model could be linked to a Landsat-8 near-infrared spectral band in the boreal forest zone of Quebec, Canada. [ABSTRACT FROM AUTHOR]
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- 2024
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42. Validation of a Monte Carlo Framework for Out-of-Field Dose Calculations in Proton Therapy
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Marijke De Saint-Hubert, Nico Verbeek, Christian Bäumer, Johannes Esser, Jörg Wulff, Racell Nabha, Olivier Van Hoey, Jérémie Dabin, Florian Stuckmann, Fabiano Vasi, Stephan Radonic, Guillaume Boissonnat, Uwe Schneider, Miguel Rodriguez, Beate Timmermann, Isabelle Thierry-Chef, and Lorenzo Brualla
- Subjects
proton therapy ,anthropomorphic pediatric phantom ,Monte Carlo simulation ,out-of-field dosimetry ,TLD ,bubble detector ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Proton therapy enables to deliver highly conformed dose distributions owing to the characteristic Bragg peak and the finite range of protons. However, during proton therapy, secondary neutrons are created, which can travel long distances and deposit dose in out-of-field volumes. This out-of-field absorbed dose needs to be considered for radiation-induced secondary cancers, which are particularly relevant in the case of pediatric treatments. Unfortunately, no method exists in clinics for the computation of the out-of-field dose distributions in proton therapy. To help overcome this limitation, a computational tool has been developed based on the Monte Carlo code TOPAS. The purpose of this work is to evaluate the accuracy of this tool in comparison to experimental data obtained from an anthropomorphic phantom irradiation. An anthropomorphic phantom of a 5-year-old child (ATOM, CIRS) was irradiated for a brain tumor treatment in an IBA Proteus Plus facility using a pencil beam dedicated nozzle. The treatment consisted of three pencil beam scanning fields employing a lucite range shifter. Proton energies ranged from 100 to 165 MeV. A median dose of 50.4 Gy(RBE) with 1.8 Gy(RBE) per fraction was prescribed to the initial planning target volume (PTV), which was located in the cerebellum. Thermoluminescent detectors (TLDs), namely, Li-7-enriched LiF : Mg, Ti (MTS-7) type, were used to detect gamma radiation, which is produced by nuclear reactions, and secondary as well as recoil protons created out-of-field by secondary neutrons. Li-6-enriched LiF : Mg,Cu,P (MCP-6) was combined with Li-7-enriched MCP-7 to measure thermal neutrons. TLDs were calibrated in Co-60 and reported on absorbed dose in water per target dose (μGy/Gy) as well as thermal neutron dose equivalent per target dose (μSv/Gy). Additionally, bubble detectors for personal neutron dosimetry (BD-PND) were used for measuring neutrons (>50 keV), which were calibrated in a Cf-252 neutron beam to report on neutron dose equivalent dose data. The Monte Carlo code TOPAS (version 3.6) was run using a phase-space file containing 1010 histories reaching an average standard statistical uncertainty of less than 0.2% (coverage factor k = 1) on all voxels scoring more than 50% of the maximum dose. The primary beam was modeled following a Fermi–Eyges description of the spot envelope fitted to measurements. For the Monte Carlo simulation, the chemical composition of the tissues represented in ATOM was employed. The dose was tallied as dose-to-water, and data were normalized to the target dose (physical dose) to report on absorbed doses per target dose (mSv/Gy) or neutron dose equivalent per target dose (μSv/Gy), while also an estimate of the total organ dose was provided for a target dose of 50.4 Gy(RBE). Out-of-field doses showed absorbed doses that were 5 to 6 orders of magnitude lower than the target dose. The discrepancy between TLD data and the corresponding scored values in the Monte Carlo calculations involving proton and gamma contributions was on average 18%. The comparison between the neutron equivalent doses between the Monte Carlo simulation and the measured neutron doses was on average 8%. Organ dose calculations revealed the highest dose for the thyroid, which was 120 mSv, while other organ doses ranged from 18 mSv in the lungs to 0.6 mSv in the testes. The proposed computational method for routine calculation of the out-of-the-field dose in proton therapy produces results that are compatible with the experimental data and allow to calculate out-of-field organ doses during proton therapy.
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- 2022
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43. Development of a real-time quantitative PCR method for detection and quantification of Prevotella copri
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Phebe Verbrugghe, Olivier Van Aken, Frida Hållenius, and Anne Nilsson
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Prevotella copri ,qPCR ,SYBR green ,Microbiology ,QR1-502 - Abstract
Abstract Background Since its discovery in 2007, the importance of the human gut bacterium Prevotella copri (P. copri) has been widely recognized with its links to diet and health status and potential as next generation probiotic. Therefore, precise, convenient and cost-effective diagnostic tools for the detection and quantification of P. copri from clinical and environmental samples are needed. Results In this study, a Sybr Green qPCR protocol for P. copri detection and quantification was developed and tested on P. copri-spiked murine faeces samples targeting both the 16S rRNA gene and P. copri genome specific genes. The use of one 16S rRNA primer pair and 2 genome specific primer pairs resulted in at least 10x higher specificity and sensitivity than the primer-only PCR currently cited in the literature, reaching a sensitivity of 103 CFU/mL. Furthermore, we showed that the new 16S rRNA primer set provided the best balance of detection of a wide range of P. copri strains, while avoiding off-target detection of other Prevotella genus species. The quantification of P. copri in human stool samples using the new 16S rRNA primers also correlated well with 16S rRNA high throughput MiSeq sequencing data (r 2 = 0.6604, p = 0.0074). The two genome specific primer pairs on the other hand uniquely detect the DSM18205 reference strain, allowing differential detection of indigenous and experimentally administered P. copri populations. Finally, it was shown that SYBR green qPCR mixes have an influence on sensitivity and specificity, with Biorad SsoAdvanced Universal SYBR Green Supermix performing the best under our test conditions of six commercially available SYBR green master mixes. Conclusions This improved qPCR-based method will allow accurate P. copri identification and quantification. Moreover, this methodology can also be applied to identify other bacterial species in complex samples.
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- 2021
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44. The human O-GlcNAcome database and meta-analysis
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Eugenia Wulff-Fuentes, Rex R. Berendt, Logan Massman, Laura Danner, Florian Malard, Jeet Vora, Robel Kahsay, and Stephanie Olivier-Van Stichelen
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Science - Abstract
Abstract Over the past 35 years, ~1700 articles have characterized protein O-GlcNAcylation. Found in almost all living organisms, this post-translational modification of serine and threonine residues is highly conserved and key to biological processes. With half of the primary research articles using human models, the O-GlcNAcome recently reached a milestone of 5000 human proteins identified. Herein, we provide an extensive inventory of human O-GlcNAcylated proteins, their O-GlcNAc sites, identification methods, and corresponding references ( www.oglcnac.mcw.edu ). In the absence of a comprehensive online resource for O-GlcNAcylated proteins, this list serves as the only database of O-GlcNAcylated proteins. Based on the thorough analysis of the amino acid sequence surrounding 7002 O-GlcNAc sites, we progress toward a more robust semi-consensus sequence for O-GlcNAcylation. Moreover, we offer a comprehensive meta-analysis of human O-GlcNAcylated proteins for protein domains, cellular and tissue distribution, and pathways in health and diseases, reinforcing that O-GlcNAcylation is a master regulator of cell signaling, equal to the widely studied phosphorylation.
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- 2021
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45. Non-Nutritive Sweeteners Acesulfame Potassium and Sucralose Are Competitive Inhibitors of the Human P-glycoprotein/Multidrug Resistance Protein 1 (PGP/MDR1)
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Laura Danner, Florian Malard, Raquel Valdes, and Stephanie Olivier-Van Stichelen
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non-nutritive sweeteners ,artificial sweeteners ,acesulfame potassium ,sucralose ,P-glycoprotein ,ABCB1 ,Nutrition. Foods and food supply ,TX341-641 - Abstract
Non-nutritive sweeteners (NNS) are popular sugar replacements used in foods, beverages, and medications. Although NNS are considered safe by regulatory organizations, their effects on physiological processes such as detoxification are incompletely understood. Previous studies revealed that the NNS sucralose (Sucr) altered P-glycoprotein (PGP) expression in rat colon. We also demonstrated that early-life exposure to NNS Sucr and acesulfame potassium (AceK) compromises mouse liver detoxification. Building upon these initial discoveries, we investigated the impact of AceK and Sucr on the PGP transporter in human cells to assess whether NNS influence its key role in cellular detoxification and drug metabolism. We showed that AceK and Sucr acted as PGP inhibitors, competing for the natural substrate-binding pocket of PGP. Most importantly, this was observed after exposure to concentrations of NNS within expected levels from common foods and beverage consumption. This may suggest risks for NNS consumers, either when taking medications that require PGP as the primary detoxification transporter or during exposure to toxic compounds.
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- 2023
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46. The Effect of Robotics Education on Gender Differences in STEM Attitudes among Dutch 7th and 8th Grade Students
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Nora van Wassenaer, Jos Tolboom, and Olivier van Beekum
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STEM education ,educational robotics ,K12 education ,gender differences ,attitude ,Education - Abstract
Because of its hands-on and integrative approach to STEM, educational robotics has become increasingly popular in recent years. Yet, a gender gap still exists in attitudes towards STEM studies and careers, especially among middle and high school students, potentially resulting in a lack of women in the STEM workforce. This study explores the effect of a robotics curriculum on Dutch 7th- and 8th-grade students’ attitude towards STEM subjects and careers, as assessed by the S-STEM survey. The results revealed no difference between the pre-test and post-test in attitudes toward STEM for both boys and girls. However, boys scored significantly higher than girls on attitude towards technology, engineering and future STEM studies on the post-test. A post hoc analysis revealed a significant difference between boys and girls on their attitude towards engineering and technology during the pre-test. These results demonstrate the difference between boys and girls in their attitudes towards STEM subjects and careers within the context of robotics education. Considering the lack of research on educational robotics among young teenagers, this field needs to be further studied to assess its effect on gender differences within attitudes towards STEM.
- Published
- 2023
- Full Text
- View/download PDF
47. Implantable loop recorders in patients with Brugada syndrome: the BruLoop study.
- Author
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Bergonti, Marco, Sacher, Frederic, Arbelo, Elena, Crotti, Lia, Sabbag, Avi, Casella, Michela, Saenen, Johan, Rossi, Andrea, Monaco, Cinzia, Pannone, Luigi, Compagnucci, Paolo, Russo, Vincenzo, Heller, Eyal, Santoro, Amato, Berne, Paola, Bisignani, Antonio, Baldi, Enrico, Leuven, Olivier Van, Migliore, Federico, and Marcon, Lorenzo
- Subjects
BRUGADA syndrome ,SYNCOPE ,ATRIAL arrhythmias ,ARRHYTHMIA ,VENTRICULAR arrhythmia ,VENTRICULAR fibrillation - Abstract
Background and Aims Available data on continuous rhythm monitoring by implantable loop recorders (ILRs) in patients with Brugada syndrome (BrS) are scarce. The aim of this multi-centre study was to evaluate the diagnostic yield and clinical implication of a continuous rhythm monitoring strategy by ILRs in a large cohort of BrS patients and to assess the precise arrhythmic cause of syncopal episodes. Methods A total of 370 patients with BrS and ILRs (mean age 43.5 ± 15.9, 33.8% female, 74.1% symptomatic) from 18 international centers were included. Patients were followed with continuous rhythm monitoring for a median follow-up of 3 years. Results During follow-up, an arrhythmic event was recorded in 30.7% of symptomatic patients [18.6% atrial arrhythmias (AAs), 10.2% bradyarrhythmias (BAs), and 7.3% ventricular arrhythmias (VAs)]. In patients with recurrent syncope, the aetiology was arrhythmic in 22.4% (59.3% BAs, 25.0% VAs, and 15.6% AAs). The ILR led to drug therapy initiation in 11.4%, ablation procedure in 10.9%, implantation of a pacemaker in 2.5%, and a cardioverter-defibrillator in 8%. At multivariate analysis, the presence of symptoms [hazard ratio (HR) 2.5, P =.001] and age >50 years (HR 1.7, P =.016) were independent predictors of arrhythmic events, while inducibility of ventricular fibrillation at the electrophysiological study (HR 9.0, P <.001) was a predictor of VAs. Conclusions ILR detects arrhythmic events in nearly 30% of symptomatic BrS patients, leading to appropriate therapy in 70% of them. The most commonly detected arrhythmias are AAs and BAs, while VAs are detected only in 7% of cases. Symptom status can be used to guide ILR implantation. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
48. Demonstration of a Smart Villa Energy Monitoring Platform in Qatar.
- Author
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Olivier Van Cutsem, I. Safak Bayram, Maher Kayal, and Jean-Charles Fosse
- Published
- 2019
- Full Text
- View/download PDF
49. Spontaneous cyclical fluctuation in respiratory minute volume during prone position ventilation in a patient with COVID-19
- Author
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Olivier van Minnen and Joep M. Droogh
- Subjects
Mechanical ventilation ,Prone position ,ARDS ,Medical emergencies. Critical care. Intensive care. First aid ,RC86-88.9 - Published
- 2022
- Full Text
- View/download PDF
50. FRIENDLY is required for efficient dark-induced mitophagy and controlled senescence in Arabidopsis
- Author
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Sylwia M. Kacprzak and Olivier Van Aken
- Subjects
Physiology (medical) ,Biochemistry - Published
- 2023
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