59,080 results on '"Leo P"'
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2. Kepemimpinan Perempuan dalam Gereja: Membongkar Mitos dan Meninjau Realitas
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Amadea Prajna Putra Mahardika and Leo Perkasa Tanjung
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feminity ,church ,leadership ,sr ann rose nu tawng ,women’s role ,Philosophy (General) ,B1-5802 ,Practical Theology ,BV1-5099 - Abstract
This paper aims to investigate history, analyze concrete cases, and provide an in-depth look at whether and how women can play leadership roles in the Church. The method used in this research is a literature study. The case study method was also used with Sr Ann Rose Nu Tawng from Myanmar as the subject. The important result of this research is that women's leadership in the Church has a very vital function. In fact, women's leadership has various characteristics and advantages that cannot be replaced by men. Church history has proven that. Finally, the conclusion of this paper is that women should be given more opportunities and trust to take on leadership roles in the Church for the good of the Church itself.
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- 2024
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3. Robust poor man’s Majorana zero modes using Yu-Shiba-Rusinov states
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Francesco Zatelli, David van Driel, Di Xu, Guanzhong Wang, Chun-Xiao Liu, Alberto Bordin, Bart Roovers, Grzegorz P. Mazur, Nick van Loo, Jan C. Wolff, A. Mert Bozkurt, Ghada Badawy, Sasa Gazibegovic, Erik P. A. M. Bakkers, Michael Wimmer, Leo P. Kouwenhoven, and Tom Dvir
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Science - Abstract
Abstract Kitaev chains in quantum dot-superconductor arrays are a promising platform for the realization of topological superconductivity. As recently demonstrated, even a two-site chain can host Majorana zero modes known as “poor man’s Majorana”. Harnessing the potential of these states for quantum information processing, however, requires increasing their robustness to external perturbations. Here, we form a two-site Kitaev chain using Yu-Shiba-Rusinov states in proximitized quantum dots. By deterministically tuning the hybridization between the quantum dots and the superconductor, we observe poor man’s Majorana states with a gap larger than 70 μeV. The sensitivity to charge fluctuations is also greatly reduced compared to Kitaev chains made with non-proximitized dots. The systematic control and improved energy scales of poor man’s Majorana states realized with Yu-Shiba-Rusinov states will benefit the realization of longer Kitaev chains, parity qubits, and the demonstration of non-Abelian physics.
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- 2024
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4. Safety and efficacy of adaptive atrial pacing regulated by blood pressure during low‐level exercise: a proof‐of‐concept study
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Michael Burnam, Robert Develle, Leo Polosajian, Shakeh Nalbandian, Kenneth Ellenbogen, and Eli Gang
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HFpEF ,Rate adaptive atrial pacing ,Exercise tolerance ,Chronotropic incompetence ,Cardiac pacing ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
Abstract Aims Despite half of all heart failure patients suffering from heart failure with preserved ejection fraction (HFpEF), treatment options are limited. This study aims to compare safety and efficacy of standard pacemaker programming (DDD or DDDR) and a novel pacing algorithm PressurePace™ (BaroPace Inc, Issaquah, WA, USA) which modulates atrial pacing rate based on blood pressure (BPAP). Methods This prospective, randomized, double‐blind, non‐significant risk proof of concept study was conducted at two large cardiology clinics in Los Angeles, California, USA. Subjects underwent two modified Bruce protocol graded treadmill exercise tests in which pacemaker programming was randomized to either standard programming (DDD or DDDR), or BPAP at least 1 week apart. Physiological measurements of heart rate (HR), and systolic and diastolic blood pressure (BP) were collected at 2 min intervals. During the BPAP treadmill test, the pacemaker activity sensor was disabled. The PressurePace algorithm instructed the pacemaker technician to modify or leave unchanged the atrial pacing rate based on these BP measurements. Subjects and clinical staff were blinded to pacemaker programming, only the pacemaker technician was unblinded. Results Ten subjects with HFpEF associated with hypertension who also had permanent dual‐chamber pacemakers, previously implanted for standard clinical indications, participated in the study. Mean age was 70.1 ± 6.8 years, left ventricular ejection fraction of 54.8 ± 1.9%. Exercise duration increased in all 10 subjects, when paced in the BPAP mode compared with standard pacemaker programming, showing a mean increase of 117 s (26%, P = 0.0016). The algorithm could adjust HR at each 2 min interval. The majority of subjects (60%) had their atrial pacing rate increased an average of 20% at t = 2 min. In the remaining 40% of subjects, the algorithm instructed HR to be unchanged. In two subjects, the pacing rate was not increased until t = 6 min. In contrast, subjects programmed to DDDR experienced an average of 45% increase in atrial pacing rate at t = 2 min. In the post‐treadmill recovery period, SBP was higher for subjects who underwent BPAP. This difference in SBP was most pronounced immediately post‐treadmill and diminished as subjects progressed through the 30 min recovery period. Statistical significance was achieved at t = 0, 20, and 30 min post‐treadmill. Conclusions An increase in exercise duration was reported in HFpEF subjects using a pacing algorithm that modulated HR based on BP compared with standard programming. These encouraging results form the basis for a larger, randomized cross‐over trial to confirm these initial observations, further characterize the safety, efficacy, and possible mechanisms of action in both acute and longer‐term treatment.
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- 2024
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5. Stress-dependent Mohr–Coulomb shear strength parameters for intact rock
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Hao Li, Leo Pel, Zhenjiang You, and David Smeulders
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Mohr–Coulomb (M-C) criterion ,Stress-dependent cohesion and friction angle ,Critical state ,Brittle to ductile ,Nonlinear strength envelope ,Medicine ,Science - Abstract
Abstract Rock strength is imperative for the design and stability analysis of engineering structures. The Mohr–Coulomb (M-C) criterion holds significant prominence in geotechnical engineering. However, the M-C criterion fails to accurately capture the nonlinear strength response and neglects the critical state of rocks, potentially leading to inaccuracies in the design phase of deep engineering projects. This study introduces an innovative stress-dependent friction angle and cohesion (SFC) for the M-C criterion to capture the nonlinear strength responses of intact rocks, spanning from non-critical to critical states (brittle to ductile regions). A novel method for determining these stress-dependent parameters at each corresponding $$\sigma_{3}$$ σ 3 is initially introduced. Subsequently, an examination of the confinement dependency of the friction angle and cohesion is conducted, leading to the derivation of the SFC model. The SFC-enhanced M-C criterion, utilizing parameters obtained from triaxial tests under lower $$\sigma_{3}$$ σ 3 , demonstrates the capability to delineate the complete non-linear strength envelope from brittle to ductile regions. Validation through triaxial test data confirms that the predictions of the SFC-enhanced M-C criterion accurately correspond to the strength characteristics of the tested rocks.
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- 2024
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6. Real world predictors of response and 24-month survival in high-grade TP53-mutated myeloid neoplasms
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Amandeep Kaur, Alexandra E. Rojek, Emily Symes, Mariam T. Nawas, Anand A. Patel, Jay L. Patel, Payal Sojitra, Barina Aqil, Madina Sukhanova, Megan E. McNerney, Leo P. Wu, Aibek Akmatbekov, Jeremy Segal, Melissa Y. Tjota, Sandeep Gurbuxani, Jason X. Cheng, Su-Yeon Yeon, Harini V. Ravisankar, Carrie Fitzpatrick, Angela Lager, Michael W. Drazer, Caner Saygin, Pankhuri Wanjari, Panagiotis Katsonis, Olivier Lichtarge, Jane E. Churpek, Sharmila B. Ghosh, Ami B. Patel, Madhu P. Menon, Daniel A. Arber, Peng Wang, and Girish Venkataraman
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Abstract Current therapies for high-grade TP53-mutated myeloid neoplasms (≥10% blasts) do not offer a meaningful survival benefit except allogeneic stem cell transplantation in the minority who achieve a complete response to first line therapy (CR1). To identify reliable pre-therapy predictors of complete response to first-line therapy (CR1) and outcomes, we assembled a cohort of 242 individuals with TP53-mutated myeloid neoplasms and ≥10% blasts with well-annotated clinical, molecular and pathology data. Key outcomes examined were CR1 & 24-month survival (OS24). In this elderly cohort (median age 68.2 years) with 74.0% receiving frontline non-intensive regimens (hypomethylating agents +/- venetoclax), the overall cohort CR1 rate was 25.6% (50/195). We additionally identified several pre-therapy factors predictive of inferior CR1 including male gender (P = 0.026), ≥2 autosomal monosomies (P 25% (P = 0.002), TP53 splice junction mutations (P = 0.007) and antecedent treated myeloid neoplasm (P = 0.001). In addition, mutations/deletions in CUX1, U2AF1, EZH2, TET2, CBL, or KRAS (‘EPI6’ signature) predicted inferior OS24 (HR = 2.0 [1.5–2.8]; P
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- 2024
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7. Enhanced Hoek-Brown (H-B) criterion for rocks exposed to chemical corrosion
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Hao Li, Leo Pel, Zhenjiang You, and David Smeulders
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Hoek-Brown (H-B) criterion ,Instantaneous mi ,Kinetic porosity-dependency ,Chemical corrosion ,Compressive strength ,Mining engineering. Metallurgy ,TN1-997 - Abstract
Underground constructions often encounter water environments, where water–rock interaction can increase porosity, thereby weakening engineering rocks. Correspondingly, the failure criterion for chemically corroded rocks becomes essential in the stability analysis and design of such structures. This study enhances the applicability of the Hoek-Brown (H-B) criterion for engineering structures operating in chemically corrosive conditions by introducing a kinetic porosity-dependent instantaneous mi (KPIM). A multiscale experimental investigation, including nuclear magnetic resonance (NMR), X-ray diffraction (XRD), scanning electron microscopy (SEM), pH and ion chromatography analysis, and triaxial compression tests, is employed to quantify pore structural changes and their linkage with the strength responses of limestone under coupled chemical-mechanical (C-M) conditions. By employing ion chromatography and NMR analysis, along with incorporating the principles of free-face dissolution theory accounting for both congruent and incongruent dissolution, a kinetic chemical corrosion model is developed. This model aims to calculate the kinetic porosity alterations within rocks exposed to varying H+ concentrations and durations. Subsequently, utilizing the generalized mixture rule (GMR), the kinetic porosity-dependent mi is formulated. Evaluation of the KPIM-enhanced H-B criterion using compression test data from 5 types of rocks demonstrated a high level of consistency between the criterion and the experimental results, with a coefficient of determination greater than 0.96, a mean absolute percentage error less than 4.84%, and a root-mean-square deviation less than 5.95 MPa. Finally, the physical significance of the porosity-dependent instantaneous mi is clarified: it serves as an indicator of a rock’s capacity to leverage the confining pressure effect.
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- 2024
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8. Hyaluronan in mesenchymal stromal cell lineage differentiation from human pluripotent stem cells: application in serum free culture
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Paul A. De Sousa, Leo Perfect, Jinpei Ye, Kay Samuels, Ewa Piotrowska, Martin Gordon, Ryan Mate, Elsa Abranches, Thomas M. Wishart, David H. Dockrell, and Aidan Courtney
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Pluripotent ,Human pluripotent stem cells ,Mesenchymal stromal cells ,Hyaluronan ,Cell therapy ,Medicine (General) ,R5-920 ,Biochemistry ,QD415-436 - Abstract
Abstract Background Hyaluronan (HA) is an extracellular glycosaminoglycan polysaccharide with widespread roles throughout development and in healthy and neoplastic tissues. In pluripotent stem cell culture it can support both stem cell renewal and differentiation. However, responses to HA in culture are influenced by interaction with a range of cognate factors and receptors including components of blood serum supplements, which alter results. These may contribute to variation in cell batch production yield and phenotype as well as heighten the risks of adventitious pathogen transmission in the course of cell processing for therapeutic applications. Main Here we characterise differentiation of a human embryo/pluripotent stem cell derived Mesenchymal Stromal Cell (hESC/PSC-MSC)-like cell population by culture on a planar surface coated with HA in serum-free media qualified for cell production for therapy. Resulting cells met minimum criteria of the International Society for Cellular Therapy for identification as MSC by expression of. CD90, CD73, CD105, and lack of expression for CD34, CD45, CD14 and HLA-II. They were positive for other MSC associated markers (i.e.CD166, CD56, CD44, HLA 1-A) whilst negative for others (e.g. CD271, CD71, CD146). In vitro co-culture assessment of MSC associated functionality confirmed support of growth of hematopoietic progenitors and inhibition of mitogen activated proliferation of lymphocytes from umbilical cord and adult peripheral blood mononuclear cells, respectively. Co-culture with immortalized THP-1 monocyte derived macrophages (Mɸ) concurrently stimulated with lipopolysaccharide as a pro-inflammatory stimulus, resulted in a dose dependent increase in pro-inflammatory IL6 but negligible effect on TNFα. To further investigate these functionalities, a bulk cell RNA sequence comparison with adult human bone marrow derived MSC and hESC substantiated a distinctive genetic signature more proximate to the former. Conclusion Cultivation of human pluripotent stem cells on a planar substrate of HA in serum-free culture media systems is sufficient to yield a distinctive developmental mesenchymal stromal cell lineage with potential to modify the function of haematopoietic lineages in therapeutic applications.
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- 2024
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9. Effect of fluticasone propionate/formoterol and fluticasone furoate/vilanterol on adolescents with chronic bronchial obstruction
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Tiina Helena Tanninen, MD, Anna Susanna Pelkonen, MD, PhD, Leo Pekka Malmberg, MD, PhD, and Mika Juhani Mäkelä, MD, PhD
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Adolescent ,asthma ,fluticasone furoate ,fluticasone propionate ,formoterol ,inhaled corticosteroid ,Immunologic diseases. Allergy ,RC581-607 - Abstract
Background: The combination of an inhaled corticosteroid (ICS) and long-acting β-agonist (LABA) (ICS/LABA) has shown superiority in improving lung function (FEV1) compared with an ICS alone. The clinical effect of a ICS/LABA combination depends on the fine-particle fraction and the pulmonary deposition. Objective: We sought to compare the efficacy of 2 combinations of an ICS and LABA, namely, fluticasone propionate (FP) and formoterol (FORM) (FP/FORM) and fluticasone furoate (FF) and vilanterol (VI) (FF/VI), in asthmatic adolescents with chronic bronchial obstruction. Methods: FP/FORM (125 μg/5 μg, 2 doses twice daily via the k-haler [Mundipharma, Cambridge, UK]) and FF/VI (92 μg/22 μg, once daily via the Ellipta inhaler [GlaxoSmithKline]) were administered to adolescents aged 12 to 17 years who required regular antiasthmatic medication and had a ratio of FEV1 to forced vital capacity (FEV1/FVC) less than –1.65 SD in a 2-sequence, 16-week crossover trial. The primary efficacy end point was change in FEV1 compared with baseline. Secondary end points were FEV1/FVC ratio, maximal expiratory flow at 50% of the FVC, impulse oscillometry indices respiratory resistance at 5 Hz (R5), difference between R5 and respiratory resistance at 20 Hz (R20), area of reactance, and Asthma Control Test score. Results: Both ICS/LABA combinations resulted in a significant improvement in FEV1 and maximal expiratory flow at 50% of the FVC z scores without any significant difference between FP/FORM and FF/VI, with 40% of patients with either treatment achieving a normal prebronchodilator FEV1/FVC z score. Neither area of reactance nor difference between R5 and R20 improved significantly with either treatment. Conclusion: Both ICS/LABA combinations demonstrated significant improvements in FEV1 z score. More than one-third of the asthmatic adolescents with prolonged bronchial obstruction achieved a normal prebronchodilator FEV1/FVC ratio.
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- 2024
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10. A systematic approach to the modelling and comparison of the geometries of spherical electrodes in inertial electrostatic confinement fusion devices
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Jan-Philipp Wulfkühler, Hai-Dang Nguyen, Leo Peiffer, and Martin Tajmar
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Medicine ,Science - Abstract
Abstract Inertial electrostatic confinement fusion (IECF) devices often use two concentric spherical electrodes to converge ions in a plasma electrostatically. Using a highly transparent inner cathode, the ions can move through the cathode and collide at the center to undergo fusion reactions. This is a simple method to build a neutron source. Past research has focused chiefly on cathode “grids” manufactured by joining metal wire loops or disc-shaped elements via spot welding. There are two common geometries: “Globe” grids with a distinct latitude-longitude structure and “symmetric” grids with even-sized triangular-shaped apertures. Recent advances in additive manufacturing have opened the way to manufacturing a third class of grids in which the apertures are evenly distributed over the grid surface and have either circular or polygonal shaped apertures - here called “regular” grids. These three types are analyzed and compared based on a set of metrics, including transparency, homogeneity of aperture size, and the regularity of aperture distribution. It is shown that every type of grid comes with different advantages and disadvantages. The analysis focuses on grid geometries with 6 to 120 apertures.
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- 2024
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11. The Role of Insulin Within the Socio-Psycho-Biological Framework in Type 2 Diabetes—A Perspective from Psychoneuroimmunology
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Anne Wevers, Silvia San Roman-Mata, Santiago Navarro-Ledesma, and Leo Pruimboom
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psychoneuroimmunology ,psychosocial factors ,insulin ,mitochondrial information processing system ,type 2 diabetes mellitus with musculoskeletal disorders and neurodegeneration ,insulin resistance ,Biology (General) ,QH301-705.5 - Abstract
The interplay between socio-psychological factors and biological systems is pivotal in defining human health and disease, particularly in chronic non-communicable diseases. Recent advancements in psychoneuroimmunology and mitochondrial psychobiology have emphasized the significance of psychological factors as critical determinants of disease onset, progression, recurrence, and severity. These insights align with evolutionary biology, psychology, and psychiatry, highlighting the inherent social nature of humans. This study proposes a theory that expands insulin’s role beyond traditional metabolic functions, incorporating it into the Mitochondrial Information Processing System (MIPS) and exploring it from an evolutionary medicine perspective to explore its function in processing psychological and social factors into biological responses. This narrative review comprises data from preclinical animal studies, longitudinal cohort studies, cross-sectional studies, machine learning analyses, and randomized controlled trials, and investigates the role of insulin in health and disease. The result is a proposal for a theoretical framework of insulin as a social substance within the socio-psycho-biological framework, emphasizing its extensive roles in health and disease. Type 2 Diabetes Mellitus (T2DM) with musculoskeletal disorders and neurodegeneration exemplifies this narrative. We suggest further research towards a comprehensive treatment protocol meeting evolutionary expectations, where incorporating psychosocial interventions plays an essential role. By supporting the concept of ‘insulin resilience’ and suggesting the use of heart rate variability to assess insulin resilience, we aim to provide an integrative approach to managing insulin levels and monitoring the effectiveness of interventions. This integrative strategy addresses broader socio-psychological factors, ultimately improving health outcomes for individuals with T2DM and musculoskeletal complications and neurodegeneration while providing new insights into the interplay between socio-psychological factors and biological systems in chronic diseases.
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- 2024
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12. Automatic three-dimensional reconstruction of the oesophagus in achalasia patients undergoing POEM: an innovative approach for evaluating treatment outcomes
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Alanna Ebigbo, Helmut Messmann, Vivian Grünherz, Miriam Elia, Alessandra Brunner, Tamara Krafft, Leo Pöller, Pia Schneider, Fabian Stieler, Bernhard Bauer, Anna Muzalyova, and Sandra Nagl
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Diseases of the digestive system. Gastroenterology ,RC799-869 - Abstract
Background and aims Peroral endoscopic myotomy (POEM) is a standard treatment option for achalasia patients. Treatment response varies due to factors such as achalasia type, degree of dilatation, pressure and distensibility indices. We present an innovative approach for treatment response prediction based on an automatic three-dimensional (3-D) reconstruction of the tubular oesophagus (TE) and the lower oesophageal sphincter (LES) in patients undergoing POEM for achalasia.Methods A software was developed, integrating data from high-resolution manometry, timed barium oesophagogram and endoscopic images to automatically generate 3-D reconstructions of the TE and LES. Novel normative indices for TE (volume×pressure) and LES (volume/pressure) were automatically integrated, facilitating pre-POEM and post-POEM comparisons. Treatment response was evaluated by changes in volumetric and pressure indices for the TE and the LES before as well as 3 and 12 months after POEM. In addition, these values were compared with normal value indices of non-achalasia patients.Results 50 treatment-naive achalasia patients were enrolled prospectively. The mean TE index decreased significantly (p
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- 2024
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13. Differences in educational opportunity predict white matter development
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Ethan Roy, Amandine Van Rinsveld, Pierre Nedelec, Adam Richie-Halford, Andreas M. Rauschecker, Leo P. Sugrue, Ariel Rokem, Bruce D. McCandliss, and Jason D. Yeatman
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White Matter ,Education ,Development ,Socioeconomic Status ,Neurophysiology and neuropsychology ,QP351-495 - Abstract
Coarse measures of socioeconomic status, such as parental income or parental education, have been linked to differences in white matter development. However, these measures do not provide insight into specific aspects of an individual’s environment and how they relate to brain development. On the other hand, educational intervention studies have shown that changes in an individual’s educational context can drive measurable changes in their white matter. These studies, however, rarely consider socioeconomic factors in their results. In the present study, we examined the unique relationship between educational opportunity and white matter development, when controlling other known socioeconomic factors. To explore this question, we leveraged the rich demographic and neuroimaging data available in the ABCD study, as well the unique data-crosswalk between ABCD and the Stanford Education Data Archive (SEDA). We find that educational opportunity is related to accelerated white matter development, even when accounting for other socioeconomic factors, and that this relationship is most pronounced in white matter tracts associated with academic skills. These results suggest that the school a child attends has a measurable relationship with brain development for years to come.
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- 2024
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14. Identifying minimum freshwater habitat conditions for an endangered fish using life cycle analysis
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Leo Polansky, Lara Mitchell, and Matthew L. Nobriga
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climate change ,Delta smelt ,endangered species ,Hypomesus transpacificus ,pareto frontier ,population viability analysis ,Ecology ,QH540-549.5 ,General. Including nature conservation, geographical distribution ,QH1-199.5 - Abstract
Abstract Identifying the most important factors affecting population growth in animal life cycles is an important tool of species conservation. Delta Smelt (Hypomesus transpacificus), an annual fish endemic to the San Francisco Estuary in California (USA), has been provided legal protection since 1993 but 30 years later exists in a conservation‐reliant state on the brink of extinction. Despite considerable controversies about what factors are most responsible for the species' decline, no population growth rate sensitivity comparisons between the most important factors regulating growth have been done. Nor has anyone attempted to quantitatively identify habitat conditions needed to support positive population growth. We developed a set of stage‐structured population models to link habitat indices regulating recruitment of new generations of fish as they metamorphosed into juveniles and the subsequent survival of those fish over several seasons until they reached adulthood. These models are used to quantify drivers of growth rate variation over 30 years. Several complimentary sensitivity analyses indicated freshwater outflow to the estuary during summer had the largest potential to change population growth. Multiple habitat metrics (e.g., food availability, temperature) influencing recruitment and life stage specific survival rates across different seasons interacted in nonlinear ways to determine habitat conditions and water management targets associated with positive population growth. We discuss the implications for freshwater management, Delta Smelt conservation, and the challenges climate change poses for co‐implementation of these two societal priorities.
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- 2024
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15. Effects of the menstrual cycle on the performance of female football players. A systematic review
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Dina Hamed-Hamed, Ana González-Muñoz, Maria Cuevas-Cervera, Jose Javier Perez-Montilla, Daniel Aguilar-Nuñez, María Aguilar-García, Leo Pruimboom, and Santiago Navarro-Ledesma
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menstrual cycle ,luteal phase ,women football ,follicular phase ,performance ,psychosocial factors ,Physiology ,QP1-981 - Abstract
Background:Women’s football has been booming for a few years now, which has led to an increase in the expectation of the players’ performance, leading to a more detailed study of women’s physiology in the field of sports.Objectives:To analyze the scientific evidence on the influence of menstruation on the performance of female footballers, as well as to analyze the methodological quality of the studies included in this review.Materials and methods:The possible hormonal effects of the menstrual cycle phases on the performance of female footballers were analyzed. The databases used to conduct the searches were Pubmed, Scopus, Virtual Health Library, Web of Science, EBSCO and the Cochrane Library. All included studies met the inclusion criteria. The Cochrane risk of bias tool was used. This systematic review protocol was registered at the International Prospective Register of Systematic Reviews (PROSPERO: CRD42023390652).Results:A total of nine clinical trials were included in this review. A low quality of evidence was observed in the studies. Not all the results support the idea that the menstrual cycle phases can alter the performance of female footballers.Conclusion:This systematic review shows that there is a great deal of controversy about the influence of the menstrual cycle phases on the performance of female footballers. Studies are focused on solely biological factors and gender is normally no part of those studies. Further research with larger samples, and taking not only biological but also sociological factors, are necessary to determine the effects of menstruation on the performance of female footballers.
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- 2024
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16. Preadipocytes in human granulation tissue: role in wound healing and response to macrophage polarization
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Tina Rauchenwald, Florian Handle, Catherine E. Connolly, Antonia Degen, Christof Seifarth, Martin Hermann, Christoph H. Tripp, Doris Wilflingseder, Susanne Lobenwein, Dragana Savic, Leo Pölzl, Evi M. Morandi, Dolores Wolfram, Ira-Ida Skvortsova, Patrizia Stoitzner, Johannes Haybaeck, Marko Konschake, Gerhard Pierer, and Christian Ploner
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Preadipocytes ,Adipose-derived stem cells ,Macrophage polarization ,Granulation tissue ,Wound healing ,Inflammation ,Pathology ,RB1-214 - Abstract
Abstract Background Chronic non-healing wounds pose a global health challenge. Under optimized conditions, skin wounds heal by the formation of scar tissue. However, deregulated cell activation leads to persistent inflammation and the formation of granulation tissue, a type of premature scar tissue without epithelialization. Regenerative cells from the wound periphery contribute to the healing process, but little is known about their cellular fate in an inflammatory, macrophage-dominated wound microenvironment. Methods We examined CD45−/CD31−/CD34+ preadipocytes and CD68+ macrophages in human granulation tissue from pressure ulcers (n=6) using immunofluorescence, immunohistochemistry, and flow cytometry. In vitro, we studied macrophage-preadipocyte interactions using primary human adipose-derived stem cells (ASCs) exposed to conditioned medium harvested from IFNG/LPS (M1)- or IL4/IL13 (M2)-activated macrophages. Macrophages were derived from THP1 cells or CD14+ monocytes. In addition to confocal microscopy and flow cytometry, ASCs were analyzed for metabolic (OXPHOS, glycolysis), morphological (cytoskeleton), and mitochondrial (ATP production, membrane potential) changes. Angiogenic properties of ASCs were determined by HUVEC-based angiogenesis assay. Protein and mRNA levels were assessed by immunoblotting and quantitative RT-PCR. Results CD45−/CD31−/CD34+ preadipocytes were observed with a prevalence of up to 1.5% of total viable cells in human granulation tissue. Immunofluorescence staining suggested a spatial proximity of these cells to CD68+ macrophages in vivo. In vitro, ASCs exposed to M1, but not to M2 macrophage secretome showed a pro-fibrotic response characterized by stress fiber formation, elevated alpha smooth muscle actin (SMA), and increased expression of integrins ITGA5 and ITGAV. Macrophage-secreted IL1B and TGFB1 mediated this response via the PI3K/AKT and p38-MAPK pathways. In addition, ASCs exposed to M1-inflammatory stress demonstrated reduced migration, switched to a glycolysis-dominated metabolism with reduced ATP production, and increased levels of inflammatory cytokines such as IL1B, IL8, and MCP1. Notably, M1 but not M2 macrophages enhanced the angiogenic potential of ASCs. Conclusion Preadipocyte fate in wound tissue is influenced by macrophage polarization. Pro-inflammatory M1 macrophages induce a pro-fibrotic response in ASCs through IL1B and TGFB1 signaling, while anti-inflammatory M2 macrophages have limited effects. These findings shed light on cellular interactions in chronic wounds and provide important information for the potential therapeutic use of ASCs in human wound healing.
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- 2023
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17. Spin-filtered measurements of Andreev bound states in semiconductor-superconductor nanowire devices
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David van Driel, Guanzhong Wang, Alberto Bordin, Nick van Loo, Francesco Zatelli, Grzegorz P. Mazur, Di Xu, Sasa Gazibegovic, Ghada Badawy, Erik P. A. M. Bakkers, Leo P. Kouwenhoven, and Tom Dvir
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Science - Abstract
Abstract Semiconductor nanowires coupled to superconductors can host Andreev bound states with distinct spin and parity, including a spin-zero state with an even number of electrons and a spin-1/2 state with odd-parity. Considering the difference in spin of the even and odd states, spin-filtered measurements can reveal the underlying ground state. To directly measure the spin of single-electron excitations, we probe an Andreev bound state using a spin-polarized quantum dot that acts as a bipolar spin filter, in combination with a non-polarized tunnel junction in a three-terminal circuit. We observe a spin-polarized excitation spectrum of the Andreev bound state, which can be fully spin-polarized, despite strong spin-orbit interaction in the InSb nanowires. Decoupling the hybrid from the normal lead causes a current blockade, by trapping the Andreev bound state in an excited state. Spin-polarized spectroscopy of hybrid nanowire devices, as demonstrated here, is proposed as an experimental tool to support the observation of topological superconductivity.
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- 2023
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18. Subgap spectroscopy along hybrid nanowires by nm-thick tunnel barriers
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Vukan Levajac, Ji-Yin Wang, Cristina Sfiligoj, Mathilde Lemang, Jan Cornelis Wolff, Alberto Bordin, Ghada Badawy, Sasa Gazibegovic, Erik P. A. M. Bakkers, and Leo P. Kouwenhoven
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Science - Abstract
Abstract Tunneling spectroscopy is widely used to examine the subgap spectra in semiconductor-superconductor nanostructures when searching for Majorana zero modes (MZMs). Typically, semiconductor sections controlled by local gates at the ends of hybrids serve as tunnel barriers. Besides detecting states only at the hybrid ends, such gate-defined tunnel probes can cause the formation of non-topological subgap states that mimic MZMs. Here, we develop an alternative type of tunnel probes to overcome these limitations. After the growth of an InSb-Al hybrid nanowire, a precisely controlled in-situ oxidation of the Al shell is performed to yield a nm-thick AlOx layer. In such thin isolating layer, tunnel probes can be arbitrarily defined at any position along the hybrid nanowire by shadow-wall angle-deposition of metallic leads. In this work, we make multiple tunnel probes along single nanowire hybrids and successfully identify Andreev bound states (ABSs) of various spatial extension residing along the hybrids.
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- 2023
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19. Intracranial electrical stimulation of corticolimbic sites modulates arousal in humans
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Joline M. Fan, A. Moses Lee, Kristin K. Sellers, Kai Woodworth, Ghassan S. Makhoul, Tony X. Liu, Catherine Henderson, Daniela A. Astudillo Maya, Rebecca Martinez, Hashem Zamanian, Benjamin A. Speidel, Ankit N. Khambhati, Vikram R. Rao, Leo P. Sugrue, Katherine W. Scangos, Edward F. Chang, and Andrew D. Krystal
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Arousal ,Neurostimulation ,Human electrophysiology ,Sleepiness ,Ventral capsule ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Background: Humans routinely shift their sleepiness and wakefulness levels in response to emotional factors. The diversity of emotional factors that modulates sleep-wake levels suggests that the ascending arousal network may be intimately linked with networks that mediate mood. Indeed, while animal studies have identified select limbic structures that play a role in sleep-wake regulation, the breadth of corticolimbic structures that directly modulates arousal in humans remains unknown. Objective: We investigated whether select regional activation of the corticolimbic network through direct electrical stimulation can modulate sleep-wake levels in humans, as measured by subjective experience and behavior. Methods: We performed intensive inpatient stimulation mapping in two human participants with treatment resistant depression, who underwent intracranial implantation with multi-site, bilateral depth electrodes. Stimulation responses of sleep-wake levels were measured by subjective surveys (i.e. Stanford Sleepiness Scale and visual-analog scale of energy) and a behavioral arousal score. Biomarker analyses of sleep-wake levels were performed by assessing spectral power features of resting-state electrophysiology. Results: Our findings demonstrated three regions whereby direct stimulation modulated arousal, including the orbitofrontal cortex (OFC), subgenual cingulate (SGC), and, most robustly, ventral capsule (VC). Modulation of sleep-wake levels was frequency-specific: 100Hz OFC, SGC, and VC stimulation promoted wakefulness, whereas 1Hz OFC stimulation increased sleepiness. Sleep-wake levels were correlated with gamma activity across broad brain regions. Conclusions: Our findings provide evidence for the overlapping circuitry between arousal and mood regulation in humans. Furthermore, our findings open the door to new treatment targets and the consideration of therapeutic neurostimulation for sleep-wake disorders.
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- 2023
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20. A new perspective of frozen shoulder pathology; the interplay between the brain and the immune system
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Santiago Navarro-Ledesma, Dina Hamed-Hamed, and Leo Pruimboom
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frozen shoulder (adhesive capsulitis) ,shoulder pain ,shoulder condition ,autoimmune disorder ,endocrinological disease ,low grade inflammation ,Physiology ,QP1-981 - Abstract
Frozen shoulder (FS), also known as adhesive capsulitis of the shoulder (FS), is a fibrotic inflammatory process of unknown etiology whose main symptoms are pain, stiffness and the loss of joint mobility. These symptoms may be associated with pathologies such as diabetes, Dupuytren’s syndrome and the prevalence of today’s sedentary lifestyle. This literature review provides an overview of the epidemiology and pathogenesis of this pathology, as well as the mechanisms of lowgrade chronic inflammation and infection, insulin resistance, and omics-science associated with it. We also propose a new hypothesis related to the possibility that the GABAergic system could play a decisive role in the development of frozen shoulder and that therefore diabetes type 1, endocrinological autoimmune disorders and frozen shoulder are connected by the same pathophysiological mechanisms. If that is true, the combined presence of psycho-emotional stress factors and pathogenic immune challenges could be the main causes of frozen shoulder syndrome. Finally, we propose a series of possible intervention strategies based on a multifactorial etiological and mechanistic concept.
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- 2024
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21. Assessing city-wide pharmaceutical emissions to wastewater via modelling and passive sampling
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Caterina Zillien, Thijs Groenveld, Odin Schut, Henry Beeltje, Daniel Blanco-Ania, Leo Posthuma, Erwin Roex, and Ad Ragas
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Environmental sciences ,GE1-350 - Abstract
With increasing numbers of chemicals used in modern society, assessing human and environmental exposure to them is becoming increasingly difficult. Recent advances in wastewater-based epidemiology enable valuable insights into public exposure to data-poor compounds. However, measuring all >26,000 chemicals registered under REACH is not just technically unfeasible but would also be incredibly expensive. In this paper, we argue that estimating emissions of chemicals based on usage data could offer a more comprehensive, systematic and efficient approach than repeated monitoring. Emissions of 29 active pharmaceutical ingredients (APIs) to wastewater were estimated for a medium-sized city in the Netherlands. Usage data was collected both on national and local scale and included prescription data, usage in health-care institutions and over-the-counter sales. Different routes of administration were considered as well as the excretion and subsequent in-sewer back-transformation of conjugates into respective parent compounds. Results suggest model-based emission estimation on a city-level is feasible and in good agreement with wastewater measurements obtained via passive sampling. Results highlight the need to include excretion fractions in the conceptual framework of emission estimation but suggest that the choice of an appropriate excretion fraction has a substantial impact on the resulting model performance.
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- 2024
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22. Note bibliografiche: Roncaglia A. (2023), Il potere. Una prospettiva riformista, Roma-Bari: Laterza, pp. 304, ISBN: 9788858151488.
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Leo Peppe
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Finance ,HG1-9999 ,Economic theory. Demography ,HB1-3840 - Abstract
Recensione a: Roncaglia A. (2023), Il potere. Una prospettiva riformista, Roma-Bari: Laterza, pp. 304, ISBN: 9788858151488.
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- 2024
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23. Tractography-based DBS lead repositioning improves outcome in refractory OCD and depression
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Genevieve Basich-Pease, Natalya Slepneva, Adam C. Frank, Tenzin Norbu, Melanie A. Morrison, Leo P. Sugrue, Paul S. Larson, Philip A. Starr, and A. Moses Lee
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deep brain stimulation ,OCD ,anterior limb of the internal capsule ,diffusion imaging ,tractography ,fMRI ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Deep brain stimulation (DBS) of the anterior limb of the internal capsule (ALIC) has been used to treat refractory obsessive-compulsive disorder (OCD) and depression, but outcomes are variable, with some patients not responding to this form of invasive neuromodulation. A lack of benefit in some patients may be due to suboptimal positioning of DBS leads. Recently, studies have suggested that specific white matter tracts within the ALIC are associated with improved outcomes. Here, we present the case of a patient who initially had a modest improvement in OCD and depressive symptoms after receiving DBS within the ALIC. Subsequently, he underwent unilateral DBS lead repositioning informed by tractography targeting the ventrolateral and medial prefrontal cortex’s connection with the mediodorsal thalamus. In this patient, we also conducted post-implant and post-repositioning diffusion imaging and found that we could successfully perform tractography even with DBS leads in place. Following lead repositioning into tracts predictive of benefit, the patient reached responder criteria for his OCD, and his depression was remitted. This case illustrates that tractography can potentially be used in the evaluation and planning of lead repositioning to achieve therapeutic outcomes.
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- 2024
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24. Complexity of coronary artery disease and the release of cardiac biomarkers after CABG
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Leo Pölzl, Ronja Lohmann, Philipp Sterzinger, Felix Nägele, Jakob Hirsch, Michael Graber, Clemens Engler, Jonas Eder, Hannes Abfalterer, Hanno Ulmer, Andrea Griesmacher, Michael Grimm, Nikolaos Bonaros, Elfriede Ruttmann-Ulmer, Johannes Holfeld, and Can Gollmann-Tepeköylü
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biomarker release ,perioperative risk stratification ,CABG ,SYNTAX Score ,cardiac surgery ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
ObjectiveIn patients with complex coronary artery disease (CAD) undergoing cardiac surgery, myocardial protection might be impaired due to microvascular obstruction, resulting in myocardial injury and subsequent biomarker release. Therefore, this study investigated the correlation between the complexity of CAD, reflected by the SYNTAX Score, and the release of cardiac biomarkers after CABG.MethodsIn a consecutive series of 919 patients undergoing isolated CABG SYNTAX scores I and II were calculated to assess the complexity of CAD. Levels of high sensitivity cardiac troponin T (hs-cTnT) and creatine kinase-myocardial band (CK-MB) were routinely measured once before and serially after surgery. Patients were divided into tertiles according to their SYNTAX Scores I and II. Spearman correlations and regression models were performed to measure the degree of association between the release of hs-cTnT and CK-MB and the SYNTAX Scores.ResultsPatients with a higher SYNTAX Score I had more comorbidities reflected in a higher EuroSCORE II. Preoperatively, higher levels of cardiac biomarkers were found in patients with higher SYNTAX Score II. No correlation was observed between hs-cTnT, CK-MB and SYNTAX Score I or II. Regression models did not show any association between cardiac biomarkers and the complexity of CAD.ConclusionThe complexity of CAD is not associated with the release of cardiac biomarkers after CABG. Factors influencing postoperative biomarker release need to be elucidated in future trials to include postoperative biomarker release into risk stratification models predicting outcome after cardiac surgery.
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- 2024
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25. White matter and literacy: A dynamic system in flux
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Ethan Roy, Adam Richie-Halford, John Kruper, Manjari Narayan, David Bloom, Pierre Nedelec, Andreas M. Rauschecker, Leo P. Sugrue, Timothy T. Brown, Terry L. Jernigan, Bruce D. McCandliss, Ariel Rokem, and Jason D. Yeatman
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White Matter ,Reading ,Longitudinal data ,Diffusion MRI ,Big Datasets ,Neurophysiology and neuropsychology ,QP351-495 - Abstract
Cross-sectional studies have linked differences in white matter tissue properties to reading skills. However, past studies have reported a range of, sometimes conflicting, results. Some studies suggest that white matter properties act as individual-level traits predictive of reading skill, whereas others suggest that reading skill and white matter develop as a function of an individual’s educational experience. In the present study, we tested two hypotheses: a) that diffusion properties of the white matter reflect stable brain characteristics that relate to stable individual differences in reading ability or b) that white matter is a dynamic system, linked with learning over time. To answer these questions, we examined the relationship between white matter and reading in a five-year longitudinal dataset and a series of large-scale, single-observation, cross-sectional datasets (N = 14,249 total participants). We find that gains in reading skill correspond to longitudinal changes in the white matter. However, in the cross-sectional datasets, we find no evidence for the hypothesis that individual differences in white matter predict reading skill. These findings highlight the link between dynamic processes in the white matter and learning.
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- 2024
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26. Swiftly Chasing Gravitational Waves across the Sky in Real Time
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Aaron Tohuvavohu, Jamie A. Kennea, Christopher J. Roberts, James DeLaunay, Samuele Ronchini, S. Bradley Cenko, Becca Ewing, Ryan Magee, Cody Messick, Surabhi Sachdev, and Leo P. Singer
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Gravitational waves ,Gamma-ray bursts ,Space telescopes ,Astrophysics ,QB460-466 - Abstract
We introduce a new capability of the Neil Gehrels Swift Observatory, dubbed “continuous commanding,” that achieves 10 s latency response time on orbit to unscheduled target-of-opportunity requests received on the ground. We show that this will allow Swift to respond to premerger (early-warning) gravitational-wave (GW) detections, rapidly slewing the Burst Alert Telescope (BAT) across the sky to place the GW origin in the BAT field of view at or before merger time. This will dramatically increase the GW/gamma-ray burst (GRB) codetection rate and enable prompt arcminute localization of a neutron star merger. We simulate the full Swift response to a GW early-warning alert, including input sky maps produced at different early-warning times, a complete model of the Swift attitude control system, and a full accounting of the latency between the GW detectors and the spacecraft. 60 s of early warning can double the rate of a prompt GRB detection with arcminute localization, and 140 s guarantees observation anywhere on the unocculted sky, even with localization areas ≫1000 deg ^2 . While 140 s is beyond current GW detector sensitivities, 30–70 s is achievable today. We show that the detection yield is now limited by the latency of LIGO/Virgo cyberinfrastructure and motivate a focus on its reduction. Continuous commanding has been integrated as a general capability of Swift, significantly increasing its versatility in response to the growing demands of time-domain astrophysics. We demonstrate this potential on an externally triggered fast radio burst (FRB), slewing 81° across the sky, and collecting X-ray and UV photons from the source position
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- 2024
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27. Divergent mechanisms of perceptual reversals in spinning and wobbling structure-from-motion stimuli.
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Leo Poom
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Medicine ,Science - Abstract
This study explores the visual phenomenon of random dot structure-from-motion (SFM), where the brain perceives 3D shapes from the coordinated 2D motion of dots. Observing SFM may lead to ambiguous depth relations that reverse back and forth during prolonged viewing. I demonstrate that different processes are involved in triggering perceived reversals for identical SFM shapes involved in spinning and wobbling motion. Durations of stable percepts were measured while human participants viewed the two SFM stimuli, and also a static Necker figure, and a wobbling Necker figure for two sets of 2.5 minutes each. The results showed that wobbling SFM resulted in much longer stable durations compared to the other stimuli. The durations for the wobbling SFM stimuli was not correlated with the spinning SFM, or the two Necker stimuli. Yet, such correlations were obtained between the other stimuli. It is known that reversals obtained while viewing spinning SFM stimuli involves bottom-up driven adaptation and recovery cycles between neural populations. This result suggests that wobbling SFM efficiently deactivates this process and targets other contributions to the reversals, such as top-down processes. In addition, biases observed in the first set disappeared in the second set implying influences of learning between the sets. Imagery vividness, which measures intrinsic top-down processes, was also scored but no correlation between scores in visual imagery and reversal rates were obtained. This research provides insight into the complex interplay between bottom-up driven adaptation-recovery cycles, and top-down processes in ambiguous perception.
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- 2024
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28. Electrostatic control of the proximity effect in the bulk of semiconductor-superconductor hybrids
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Nick van Loo, Grzegorz P. Mazur, Tom Dvir, Guanzhong Wang, Robin C. Dekker, Ji-Yin Wang, Mathilde Lemang, Cristina Sfiligoj, Alberto Bordin, David van Driel, Ghada Badawy, Sasa Gazibegovic, Erik P. A. M. Bakkers, and Leo P. Kouwenhoven
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Science - Abstract
Abstract The proximity effect in semiconductor-superconductor nanowires is expected to generate an induced gap in the semiconductor. The magnitude of this induced gap, together with the semiconductor properties like spin-orbit coupling and g-factor, depends on the coupling between the materials. It is predicted that this coupling can be adjusted through the use of electric fields. We study this phenomenon in InSb/Al/Pt hybrids using nonlocal spectroscopy. We show that these hybrids can be tuned such that the semiconductor and superconductor are strongly coupled. In this case, the induced gap is similar to the superconducting gap in the Al/Pt shell and closes only at high magnetic fields. In contrast, the coupling can be suppressed which leads to a strong reduction of the induced gap and critical magnetic field. At the crossover between the strong-coupling and weak-coupling regimes, we observe the closing and reopening of the induced gap in the bulk of a nanowire. Contrary to expectations, it is not accompanied by the formation of zero-bias peaks in the local conductance spectra. As a result, this cannot be attributed conclusively to the anticipated topological phase transition and we discuss possible alternative explanations.
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- 2023
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29. The effect of internal branding on organisational financial performance and brand loyalty: mediating role of psychological empowerment
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Maryam Soleimani, Leo Paul Dana, Aidin Salamzadeh, Parisa Bouzari, and Pejman Ebrahimi
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Internal branding ,Psychological empowerment ,Financial performance ,Brand loyalty ,Economics as a science ,HB71-74 - Abstract
Purpose – This study explores the effect of internal branding on organisational financial performance and brand loyalty with the mediating role of psychological empowerment. Design/methodology/approach – The data gathered from 200 Pasargad insurance employees in Iran were analysed. Structural equation modelling and R were used to evaluate the model. Financial performance was measured by four concepts (ROI, ROE, Sales growth, ROA) based on available data from March 2010 to March 2020. Findings – The results revealed that internal branding and psychological empowerment have no significant effect on financial performance, but both have a significant positive effect on brand loyalty. Likewise, the mediating role of psychological empowerment on the subject of the impact of internal branding on brand loyalty was confirmed. Furthermore, psychological empowerment did not play a mediating role in the impact of internal branding on financial performance. Research limitations/implications – The findings of this study could be important for managers of organisations active in the insurance industry to highlight internal branding and enhance psychological empowerment and employee brand loyalty. Moreover, managers' perception of the effective role of psychological empowerment to enhance employee brand loyalty is another practical aspect of this research. Originality/value – Considering the mediating role of psychological empowerment to the effect of internal branding on financial performance and brand loyalty is an innovative aspect of the present study. Meanwhile, the use of R software for VB-SEM was another point to surge the value of this paper.
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- 2023
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30. PRNP expression predicts imaging findings in sporadic Creutzfeldt‐Jakob disease
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Iris J. Broce, Eduardo Caverzasi, Simone Sacco, Ryan Michael Nillo, Matteo Paoletti, Rahul S. Desikan, Michael Geschwind, and Leo P. Sugrue
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Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 ,Neurology. Diseases of the nervous system ,RC346-429 - Abstract
Abstract Objective We explored the relationship between regional PRNP expression from healthy brain tissue and patterns of increased and decreased diffusion and regional brain atrophy in patients with sporadic Creutzfeldt‐Jakob disease (sCJD). Methods We used PRNP microarray data from 6 healthy adult brains from Allen Brain Institute and T1‐weighted and diffusion‐weighted MRIs from 34 patients diagnosed with sCJD and 30 age‐ and sex‐matched healthy controls to construct partial correlation matrices across brain regions for specific measures of interest: PRNP expression, mean diffusivity, volume, cortical thickness, and local gyrification index, a measure of cortical folding. Results Regional patterns of PRNP expression in the healthy brain correlated with regional patterns of diffusion signal abnormalities and atrophy in sCJD. Among different measures of cortical morphology, regional patterns of local gyrification index in sCJD most strongly correlated with regional patterns of PRNP expression. At the vertex‐wise level, different molecular subtypes of sCJD showed distinct regional correlations in local gyrification index across the cortex. Local gyrification index correlation patterns most closely matched patterns of PRNP expression in sCJD subtypes known to have greatest pathologic involvement of the cerebral cortex. Interpretation These results suggest that the specific genetic and molecular environment in which the prion protein is expressed confer variable vulnerability to misfolding across different brain regions that is reflected in patterns of imaging findings in sCJD. Further work in larger samples will be needed to determine whether these regional imaging patterns can serve as reliable markers of distinct disease subtypes to improve diagnosis and treatment targeting.
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- 2023
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31. Lean Demonstration of On-Board Thermal Anomaly Detection Using Machine Learning
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Jan Thoemel, Konstantinos Kanavouras, Maanasa Sachidanand, Andreas Hein, Miguel Ortiz del Castillo, Leo Pauly, Arunkumar Rathinam, and Djamila Aouada
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hosted payload ,machine learning ,thermal anomalies ,anomaly detection ,Motor vehicles. Aeronautics. Astronautics ,TL1-4050 - Abstract
Moore’s law states that the performance of computers doubles about every two years. This has dramatic consequences for any modern high development and for satellites. The long development cycles cause these expensive assets to be obsolete before the start of their operations. The advancement also presents challenges to their design, particularly from a thermal perspective, as more heat is dissipated and circuits are more fragile. These challenges mandate that faster spacecraft development methods are found and thermal management technologies are developed. We elaborate on existing development methodologies and present our own lean method. We explore the development of a thermal anomaly-detection payload, extending from conception to in-orbit commissioning, to stimulate discussions on space hardware development approaches. The payload consists of four miniaturized infrared cameras, heating sources in view of the cameras simulating an anomaly, an on-board processor, and peripherals for electrical and communication interfaces. The paper outlines our methodology and its application, showcasing the success of our efforts with the first-light activation of our cameras in orbit. We show our lean method, featuring reference technical and management models, from which we derive further development tools; such details are normally not available in the scientific-engineering literature. Additionally, we address the shortcomings identified during our development, such as the failure of an on-board component and propose improvements for future developments.
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- 2024
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32. The Relationship between Abdominal Diastasis and Lumbar Pain Pressure Threshold in Women Who Have Given Birth between the Ages of 30 and 45 Years—An Observational Pilot Study
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Ana González-Muñoz, Leo Pruimboom, and Santiago Navarro-Ledesma
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diastasis ,inter-rectus diastasis ,low back pain ,pain pressure threshold ,ultrasound ,Medicine (General) ,R5-920 - Abstract
Background and Objectives: Current evidence confirms that the magnitude of the inter-rectus distance (IRD) is associated with the severity of abdominal pain. Furthermore, evidence exists in the literature about the impact abdominal muscles have on low back pain, lumbopelvic pain, breathing and lumbar abdominal strength; however, no studies analysing the level of association between abdominal diastasis and lumbar pain pressure threshold (PPT) exist. The aim of this study was to analyse the level of association between the rectus abdominis distance and pain pressure threshold in the lumbar spinous processes in women who have given birth between the ages of 30 and 45 years. Secondly, it was to study the level of association between the time elapsed since the last delivery and low back pain in women who have given birth between 30 and 45 years of age. Material and Methods: This was a pilot observational study in which 21 females participated. The abdominal diastasis was measured by ultrasound, the pain pressure threshold was assessed by an algometer and the pain perception by the Mc Gill questionnaire. Results: There was no significant relationship between increased abdominal distance and increased lumbopelvic pain in women who gave birth between the ages of 30 and 45 years. However, there was a correlation between the time that had elapsed since the last delivery and low back pain. Conclusions: there was a correlation between the time that had elapsed since the last delivery and low back pain. Further studies analysing factors that may perpetuate the chronicity of symptoms, such as lifestyle and intrinsic factors, are needed.
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- 2024
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33. Modelling of T1 dispersion effects on fluid polarization in oil flow
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Rutger R. Tromp, Leo Pel, and David M.J. Smeulders
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Fluid polarization ,Non-uniform field ,T1 dispersion ,Earth's field NMR ,Flow velocity profile ,Medical physics. Medical radiology. Nuclear medicine ,R895-920 ,Physics ,QC1-999 - Abstract
In this article we use numerical simulations to study the effect of T1 dispersion on fluid polarization buildup in oil flow to characterize the sensitivity of both a conventional NMR concept (ROI located inside the polarization magnet) and a Earth's field NMR concept (ROI outside and downstream of the polarization magnet) to T1 dispersion of flowing samples. As a polarization field in both concepts we use a 90 cm long Halbach magnet. The T1 dispersion behavior of the oils is based on a set of crude oils that span a viscosity range of 0.7 cP up to 2·104 cP and T1 relaxation measurements for Larmor frequencies between 10 kHz and 20 MHz. Numerical simulations based on solving the Bloch-Torrey equation for the longitudinal magnetization component show that fluid polarization levels in a ROI of a Earth's field NMR system concept are much more strongly affected by T1 dispersion than in the conventional NMR system concept. As a result, we may conclude that the Earth's field NMR system design is less robust for measuring flowing samples that show strong T1 dispersion behavior. In comparison, the conventional NMR system design is relatively insensitive to the effect of T1 dispersion, as T1 dispersion effects were found to form a relatively small correction to the magnetization buildup. The conventional NMR system design consequently is the preferred implementation of a NMR system that operates on fluids with strong T1 dispersion behavior. We show that in the presence of T1 dispersion s = vT1(0)/Lm* may be used as a governing parameter for fluid polarization buildup, where T1(0) is the T1 relaxation time in the center of the polarization magnet, and we show how an modified analytical uniform field model can be used to describe fluid polarization for a uniform flow velocity distribution in the presence of T1 dispersion with an accuracy within 1% for the samples and field distribution considered in this study at industrially relevant flow velocities.
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- 2023
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34. 963 TME Immune-profiling of ex vivo tumor tissues and their functional responses to immuno-oncology treatments
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Sander Basten, Nataliia Beztsinna, Kuan Yan, Niels Meesters, Emma Spanjaard, Leo Price, Talita Stessuk, and Ezgi Kaya Aksoy
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Published
- 2023
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35. 77 Analyzing effects of immunotherapies, such as bispecific antibodies and cellular therapy, targeting EGFR expression with a high content screening platform in patient-derived organoids
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Gera Goverse, Sander Basten, Leo Price, Saskia de Man, Chiara Foini, Tomas Veenendaal, Sergei Chavez-Abiega, Michelle Kop, Rick Heeren, Christos Sarantaris, Daniel Okkes, and Ashgard Weterings
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Published
- 2023
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36. 3D U-Net for automated detection of multiple sclerosis lesions: utility of transfer learning from other pathologies
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Stephen G. Wahlig, Pierre Nedelec, David A. Weiss, Jeffrey D. Rudie, Leo P. Sugrue, and Andreas M. Rauschecker
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multiple sclerosis ,demyelination ,deep learning ,transfer learning ,segmentation ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Background and purposeDeep learning algorithms for segmentation of multiple sclerosis (MS) plaques generally require training on large datasets. This manuscript evaluates the effect of transfer learning from segmentation of another pathology to facilitate use of smaller MS-specific training datasets. That is, a model trained for detection of one type of pathology was re-trained to identify MS lesions and active demyelination.Materials and methodsIn this retrospective study using MRI exams from 149 patients spanning 4/18/2014 to 7/8/2021, 3D convolutional neural networks were trained with a variable number of manually-segmented MS studies. Models were trained for FLAIR lesion segmentation at a single timepoint, new FLAIR lesion segmentation comparing two timepoints, and enhancing (actively demyelinating) lesion segmentation on T1 post-contrast imaging. Models were trained either de-novo or fine-tuned with transfer learning applied to a pre-existing model initially trained on non-MS data. Performance was evaluated with lesionwise sensitivity and positive predictive value (PPV).ResultsFor single timepoint FLAIR lesion segmentation with 10 training studies, a fine-tuned model demonstrated improved performance [lesionwise sensitivity 0.55 ± 0.02 (mean ± standard error), PPV 0.66 ± 0.02] compared to a de-novo model (sensitivity 0.49 ± 0.02, p = 0.001; PPV 0.32 ± 0.02, p
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- 2023
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37. Epileptiform discharges triggered with direct electrical stimulation for treatment-resistant depression: Factors that modulate risk and treatment considerations
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Joline M. Fan, Ankit N. Khambhati, Kristin K. Sellers, Noah Stapper, Daniela Astudillo Maya, Elysha Kunwar, Catherine Henderson, Leo P. Sugrue, Katherine W. Scangos, Edward F. Chang, Vikram R. Rao, and Andrew D. Krystal
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Epileptiform activity ,Seizure ,Responsive neurostimulation ,Deep brain stimulation ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Published
- 2023
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38. Behavioral Assessment of Soft Skill Development in a Highly Structured Pre-Health Biology Course for Undergraduates
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Joanne Tran, Leo Meller, Vy Le, Jasmine Tam, and Andrea Nicholas
- Abstract
In this study, we assessed a highly structured, yearlong, case-based course designed for undergraduate pre-health students. We incorporated both content learning assessments and developed a novel method called Multiple Mini Exams for assessing course impact on the development of skills that professional schools often seek in pre-health students, focusing on students' abilities to collaborate with others, display bedside manners, synthesize patient case details, appropriately use scientific and medical language, and effectively attain patients' medical histories. This novel method utilized a rubric based on desired medical student skills to score videotaped behaviors and interactions of students role playing as doctors in a hypothetical patient case study scenario. Overall, our findings demonstrate that a highly structured course, incorporating weekly student performance and presentation of patient cases encompassing history taking, diagnosis, and treatment, can result in content learning, as well as improve desired skills specific for success in medical fields.
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- 2024
39. Safety and efficacy of direct cardiac shockwave therapy in patients with ischemic cardiomyopathy undergoing coronary artery bypass grafting (the CAST-HF trial): study protocol for a randomized controlled trial—an update
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Felix Nägele, Leo Pölzl, Michael Graber, Jakob Hirsch, Agnes Mayr, Mathias Pamminger, Felix Troger, Markus Theurl, Michael Schreinlechner, Nikolay Sappler, Christian Dorfmüller, Martina Mitrovic, Hanno Ulmer, Michael Grimm, Can Gollmann-Tepeköylü, and Johannes Holfeld
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Shockwave ,CABG ,Ischemic heart disease ,Heart failure ,Clinical trial ,Medicine (General) ,R5-920 - Abstract
Abstract Background Coronary artery disease (CAD) remains a severe socio-economic burden in the Western world. Coronary obstruction and subsequent myocardial ischemia result in the progressive replacement of contractile myocardium with dysfunctional, fibrotic scar tissue. Post-infarctional remodelling is causal for the concomitant decline of left-ventricular function and the fatal syndrome of heart failure. Available neurohumoral treatment strategies aim at the improvement of symptoms. Despite extensive research, therapeutic options for myocardial regeneration, including (stem)-cell therapy, gene therapy, cellular reprogramming or tissue engineering, remain purely experimental. Thus, there is an urgent clinical need for novel treatment options for inducing myocardial regeneration and improving left-ventricular function in ischemic cardiomyopathy. Shockwave therapy (SWT) is a well-established regenerative tool that is effective for the treatment of chronic tendonitis, long-bone non-union and wound-healing disorders. In preclinical trials, SWT regenerated ischemic myocardium via the induction of angiogenesis and the reduction of fibrotic scar tissue, resulting in improved left-ventricular function. Methods In this prospective, randomized controlled, single-blind, monocentric study, 80 patients with reduced left-ventricular ejection fraction (LVEF≤ 40%) are subjected to coronary-artery bypass-graft surgery (CABG) surgery and randomized in a 1:1 ratio to receive additional cardiac SWT (intervention group; 40 patients) or CABG surgery with sham treatment (control group; 40 patients). This study aims to evaluate (1) the safety and (2) the efficacy of cardiac SWT as adjunctive treatment during CABG surgery for the regeneration of ischemic myocardium. The primary endpoints of the study represent (1) major cardiac events and (2) changes in left-ventricular function 12 months after treatment. Secondary endpoints include 6-min walk test distance, improvement of symptoms and assessment of quality of life. Discussion This study aims to investigate the safety and efficacy of cardiac SWT during CABG surgery for myocardial regeneration. The induction of angiogenesis, decrease of fibrotic scar tissue formation and, thus, improvement of left-ventricular function could lead to improved quality of life and prognosis for patients with ischemic heart failure. Thus, it could become the first clinically available treatment strategy for the regeneration of ischemic myocardium alleviating the socio-economic burden of heart failure. Trial registration ClinicalTrials.gov NCT03859466. Registered on 1 March 2019.
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- 2022
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40. Correlation between structural heart disease and cardiac SARS-CoV-2 manifestations
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Felix Nägele, Michael Graber, Jakob Hirsch, Leo Pölzl, Sabina Sahanic, Manuel Fiegl, Dominik Hau, Clemens Engler, Sophia Lechner, Anna Katharina Stalder, Kirsten D. Mertz, Jasmin D. Haslbauer, Alexandar Tzankov, Michael Grimm, Ivan Tancevski, Johannes Holfeld, and Can Gollmann-Tepeköylü
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Medicine - Abstract
Nägele, Graber et al. evaluate cardiac manifestations of SARS-CoV-2 in patients with structural heart disease. The authors find that detection of SARS-CoV-2 in heart tissue is associated with poorer survival.
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- 2022
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41. Efficacy of combined strategies of physical activity, diet and sleep disorders as treatment in patients with chronic shoulder pain. A systematic review
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Dina Hamed Hamed, Filip Struyf, Leo Pruimboom, and Santiago Navarro-Ledesma
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physical activity ,rehabilitation ,chronic shoulder pain ,healthy life style ,sleep wake disorders ,Physiology ,QP1-981 - Abstract
Introduction: The objective of this systematic review was to analyze the existing scientific evidence on the influence of dietary strategies, exercise, and sleep disorders on the symptomatology of patients with chronic shoulder pain, as well as to assess the methodological quality of the literature collected.Methods: The selection criteria were as follows: we included randomized controlled clinical trials written in English that investigated the effects of such interventions in patients with chronic shoulder pain and excluded studies where pre-operative rehabilitation or rehabilitation combined with corticosteroid injections was performed. We searched six databases Pubmed, Cochrane Library, Web of Science, CINAHL, Sportdiscus and Scopus, using the keywords “shoulder pain,” “fasting,” “physical therapy modalities,” “rehabilitation,” “exercise,” “circadian clocks,” and “chronic pain” to select randomized controlled clinical trials conducted in humans and written in English. The last search was conducted on 24/01/2023. (PROSPERO:CRD42023379925).Results: We used the tool proposed by the Cochrane Handbook to assess the risk of bias in the included studies of the 17 studies included, nine had a high risk of bias, two studies had an unclear risk of bias, and the remaining six studies had a low risk of bias. A total of 17 articles were selected, including 10 studies that showed a positive influences of exercise on chronic shoulder pain and five studies that showed a negative influence of sleep disorders on this patient profile. The remaining two articles analyzed the influence of nutritional strategies and metabolic problems in patients with chronic shoulder pain. The total sample size of the 17 included articles amounted to 9,991 individuals.Discussion: Studies confirm that exercise generates a hypoalgesic effect that improves chronic shoulder pain, functionality, and quality of life. Although dietary strategies and sleep disorders are known to influence chronic shoulder pain, there is a lack of studies that conduct interventions on these problems to assess how chronic shoulder pain varies.
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- 2023
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42. Reflections beyond implementation: Evaluation of the project-based learning in the research curriculum of the Philippine Science High School - Luzon campuses
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Leo Peter Dacumos and Dorothy Silva
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project-based learning ,research education ,science high school ,Theory and practice of education ,LB5-3640 ,Science - Abstract
STEM schools have put priority on establishing research education as a core program that enables students to choose a topic of their choice, identify a problem, and find a solution to it through experimentation and other modes of data collection. At the Philippine Science High Schools, one of its key goals is to foster a research culture among its scholars, who will help to strengthen the country's academic and scientific workforce and contribute to its success in the future. To improve instructional teaching, the project-based learning (PBL) approach has been utilized in many academic courses. A cache of studies has delved into the use of project-based learning approaches in many academic courses but the research education. This research project aimed to evaluate the implementation of project-based learning (PBL) in the STEM Research curriculum of the Philippine Science High School – Luzon campuses. Select teachers from the Philippine Science High School have shared their thoughts through the qualitative interview tool. The use of qualitative interview tool is aimed to explore their thoughts and opinions regarding the various aspects of project-based learning (PBL) implementation within the PSHS research curriculum. Thematic analysis using phenomenological reduction shows emerging themes highlighting the benefits, challenges, and things that are needed to start to improve the implementation of the project-based learning approach within the research curriculum of the PSHS system.
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- 2023
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43. Zero knowledge and high interest in the use of long-acting injectable pre-exposure prophylaxis (PrEP) among adolescent men who have sex with men and transgender women in two capital cities in Brazil
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Leo Pedrana, Laio Magno, Eliana Miura Zucchi, Luís Augusto Vasconcelos da Silva, Dulce Ferraz, Alexandre Grangeiro, Marcelo Castellanos, Sandra Assis Brasil, and Inês Dourado
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Pre-exposure prophylaxis ,Long-acting injectable ,Acceptability ,Adolescents ,HIV/AIDS ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Adolescent men who have sex with men (aMSM) and transgender women (aTGW) are affected disproportionately by human immunodeficiency virus (HIV) infection. Although new methods of pre-exposure prophylaxis (PrEP), such as long-acting injectable (LAI-PrEP), have been approved by the Food and Drug Administration, their acceptability among aMSM/aTGW is not well known. Methods Forty-eight semi-structured interviews were conducted to assess the knowledge and interest in LAI-PrEP among aMSM/aTGW enrolled in a daily oral PrEP cohort from two capital cities of Brazil since 2019. Results Previous knowledge of LAI-PrEP remains scarce, but the high interest regarding its use has been reported. Interest in the use of LAI-PrEP is associated with eliminating the burden of daily responsibility or the risk of missing the necessary medications, lowering the costs of this method, increasing confidentiality, and decreasing the frequency of visiting PrEP clinics. The reported barriers to uptake included fear of injection, doubts on its effectiveness, side effects, and greater dependence on a health provider. Conclusions There is an urgent need to strengthen the preventive strategies against HIV infection among the youth, enhance their knowledge and those of healthcare providers, and offer safe and new options.
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- 2022
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44. Editorial: Long COVID-19: ultimate reasoning as a need for the search of proximate solutions
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Leo Pruimboom
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SARS-CoV-2 ,long COVID ,lifestyle ,evolutionary medicine ,COVID prevention ,Microbiology ,QR1-502 - Published
- 2023
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45. Mitochondria: It is all about energy
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Amaloha Casanova, Anne Wevers, Santiago Navarro-Ledesma, and Leo Pruimboom
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mitochondria ,mitochondrial dysfunction ,mitochondrial metabolism ,mitochondrial hormesis ,hormesis ,Physiology ,QP1-981 - Abstract
Mitochondria play a key role in both health and disease. Their function is not limited to energy production but serves multiple mechanisms varying from iron and calcium homeostasis to the production of hormones and neurotransmitters, such as melatonin. They enable and influence communication at all physical levels through interaction with other organelles, the nucleus, and the outside environment. The literature suggests crosstalk mechanisms between mitochondria and circadian clocks, the gut microbiota, and the immune system. They might even be the hub supporting and integrating activity across all these domains. Hence, they might be the (missing) link in both health and disease. Mitochondrial dysfunction is related to metabolic syndrome, neuronal diseases, cancer, cardiovascular and infectious diseases, and inflammatory disorders. In this regard, diseases such as cancer, Alzheimer’s, Parkinson’s, amyotrophic lateral sclerosis (ALS), chronic fatigue syndrome (CFS), and chronic pain are discussed. This review focuses on understanding the mitochondrial mechanisms of action that allow for the maintenance of mitochondrial health and the pathways toward dysregulated mechanisms. Although mitochondria have allowed us to adapt to changes over the course of evolution, in turn, evolution has shaped mitochondria. Each evolution-based intervention influences mitochondria in its own way. The use of physiological stress triggers tolerance to the stressor, achieving adaptability and resistance. This review describes strategies that could recover mitochondrial functioning in multiple diseases, providing a comprehensive, root-cause-focused, integrative approach to recovering health and treating people suffering from chronic diseases.
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- 2023
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46. A First Step towards Meteosat Third Generation Day-2 Precipitation Rate Product: Deep Learning for Precipitation Rate Retrieval from Geostationary Infrared Measurements
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Leo Pio D’Adderio, Daniele Casella, Stefano Dietrich, Giulia Panegrossi, and Paolo Sanò
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GEO VIS/IR ,precipitation rate ,machine learning ,parallax displacement ,Science - Abstract
The estimate of precipitation from satellite measurements is an indirect estimate if compared to rain gauges or disdrometer measurements, but it has the advantage of complete coverage over oceans, mountainous regions, and sparsely populated areas where other sources of precipitation data (e.g., weather radar) are unavailable or unreliable. Among the satellite-based precipitation estimates, geostationary (GEO) data ensure the highest spatial and temporal resolution. At the same time, the IR/VIS channels deployed on GEO satellites have lower capabilities than microwave (MW) channels in characterizing the cloud structure. Machine learning (ML) techniques can be considered a powerful tool to overcome the limitations related to the physical relationship between IR/VIS channels and precipitation estimation. This study describes the development of a convolutional neural network (U-Net) to retrieve the precipitation rate using IR measurements only from the Meteosat Second Generation (MSG) satellite. Its performances are evaluated through a comparison with H SAF and NASA operational products (e.g., H60B or H03B and IMERG-E, respectively), of which the algorithms are based on different principles. The results highlight a lower error in precipitation rate estimates for the U-Net with respect to the other products but also some issues in correctly estimating the more intense precipitation (>5 mmh−1). On the other hand, the precipitation detection capabilities of the U-Net outperform the H SAF products for lower precipitation rate, while IMERG-E shows the best performance regardless of the precipitation regime. Furthermore, the U-Net is able to account for and correct the parallax displacement that affects the measurement as the satellite viewing angle increases.
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- 2023
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47. Tonate Virus and Fetal Abnormalities, French Guiana, 2019
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Veronique Lambert, Antoine Enfissi, Mathilde Lefebvre, Leo Pomar, Sobhi Kedous, Fabien Guimiot, Gabriel Carles, Anne Lavergne, Dominique Rousset, and Najeh Hcini
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tonate virus ,fetal abnormalities ,pregnancy ,vertical disease transmission ,arboviruses ,French Guiana ,Medicine ,Infectious and parasitic diseases ,RC109-216 - Abstract
We report a case of vertical transmission of Tonate virus in a pregnant woman from French Guiana. The fetus showed severe necrotic and hemorrhagic lesions of the brain and spinal cord. Clinicians should be made aware of possible adverse fetal outcomes in pregnant women infected with Tonate virus.
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- 2022
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48. Data processing pipeline for cardiogenic shock prediction using machine learning
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Nikola Jajcay, Branislav Bezak, Amitai Segev, Shlomi Matetzky, Jana Jankova, Michael Spartalis, Mohammad El Tahlawi, Federico Guerra, Julian Friebel, Tharusan Thevathasan, Imrich Berta, Leo Pölzl, Felix Nägele, Edita Pogran, F. Aaysha Cader, Milana Jarakovic, Can Gollmann-Tepeköylü, Marta Kollarova, Katarina Petrikova, Otilia Tica, Konstantin A. Krychtiuk, Guido Tavazzi, Carsten Skurk, Kurt Huber, and Allan Böhm
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classification ,machine learning ,missing data imputation ,processing pipeline ,prediction model ,cardiogenic shock ,Diseases of the circulatory (Cardiovascular) system ,RC666-701 - Abstract
IntroductionRecent advances in machine learning provide new possibilities to process and analyse observational patient data to predict patient outcomes. In this paper, we introduce a data processing pipeline for cardiogenic shock (CS) prediction from the MIMIC III database of intensive cardiac care unit patients with acute coronary syndrome. The ability to identify high-risk patients could possibly allow taking pre-emptive measures and thus prevent the development of CS.MethodsWe mainly focus on techniques for the imputation of missing data by generating a pipeline for imputation and comparing the performance of various multivariate imputation algorithms, including k-nearest neighbours, two singular value decomposition (SVD)—based methods, and Multiple Imputation by Chained Equations. After imputation, we select the final subjects and variables from the imputed dataset and showcase the performance of the gradient-boosted framework that uses a tree-based classifier for cardiogenic shock prediction.ResultsWe achieved good classification performance thanks to data cleaning and imputation (cross-validated mean area under the curve 0.805) without hyperparameter optimization.ConclusionWe believe our pre-processing pipeline would prove helpful also for other classification and regression experiments.
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- 2023
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49. Observation of shoot growth: a simple and operational decision-making tool for monitoring vine water status in the vineyard
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Leo Pichon, Cécile Laurent, Jean-Christophe Payan, and Bruno Tisseyre
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Apex ,Grapevine ,Vegetative indicator ,Vitis vinifera ,Water potential ,Water restriction ,Agriculture ,Botany ,QK1-989 - Abstract
In vineyard management, the monitoring of vine water status is of great importance, because this variable influences harvest quality, yield and, in the longer term, vineyard sustainability. Numerous tools and methods have been proposed to monitor vine water status, but they often involve the use of costly and complex equipment and can be logistically demanding. Methods based on the observation of vine shoot growth are interesting potential alternatives, because they are simple to carry out and therefore potentially better adapted for use in production vineyards. However, these methods have never been evaluated or compared to reference measurements made on several cultivars and during several vintages. The objective of this article was to study their characteristics (validity range, specificity and sensitivity) in order to be able to give recommendations for their rigorous implementation in an experimental or operational context. The study was carried out using the iG-Apex method to measure vine shoot growth and predawn leaf water potential as reference measurements in 55 fields located in the Tavel vineyard (Occitanie, France) during the 2008 to 2012 vintages. The results showed that iG-Apex can be used as an operational tool for monitoring vine water status at field scale and for a predawn leaf water potential ranging from -0.2 MPa to -0.8 MPa. Nevertheless, precautions must be taken when interpreting the results, as the method is not specific to water constraint and is also sensitive to other phenomena. Furthermore, it could be relevant to use this method for the collective monitoring of vine shoot growth over large spatial areas, in addition to more precise and more localised monitoring carried out with reference measurements.
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- 2023
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50. Lessons from a Space Lab: An Image Acquisition Perspective
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Leo Pauly, Michele Lynn Jamrozik, Miguel Ortiz del Castillo, Olivia Borgue, Inder Pal Singh, Mohatashem Reyaz Makhdoomi, Olga-Orsalia Christidi-Loumpasefski, Vincent Gaudillière, Carol Martinez, Arunkumar Rathinam, Andreas Hein, Miguel Olivares-Mendez, and Djamila Aouada
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Motor vehicles. Aeronautics. Astronautics ,TL1-4050 - Abstract
The use of deep learning (DL) algorithms has improved the performance of vision-based space applications in recent years. However, generating large amounts of annotated data for training these DL algorithms has proven challenging. While synthetically generated images can be used, the DL models trained on synthetic data are often susceptible to performance degradation when tested in real-world environments. In this context, the Interdisciplinary Center of Security, Reliability and Trust (SnT) at the University of Luxembourg has developed the “SnT Zero-G Lab,” for training and validating vision-based space algorithms in conditions emulating real-world space environments. An important aspect of the SnT Zero-G Lab development was the equipment selection. From the lessons learned during the lab development, this article presents a systematic approach combining market survey and experimental analyses for equipment selection. In particular, the article focuses on the image acquisition equipment in a space lab: background materials, cameras, and illumination lamps. The results from the experiment analyses show that the market survey complimented by experimental analyses is required for effective equipment selection in a space lab development project.
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- 2023
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