1,951 results on '"Nakas A"'
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2. Exact black holes in string-inspired Euler-Heisenberg theory
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Bakopoulos, Athanasios, Karakasis, Thanasis, Mavromatos, Nick E., Nakas, Theodoros, and Papantonopoulos, Eleftherios
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High Energy Physics - Theory ,Astrophysics - High Energy Astrophysical Phenomena ,General Relativity and Quantum Cosmology - Abstract
We consider higher-order derivative gauge field corrections that arise in the fundamental context of dimensional reduction of String Theory and Lovelock-inspired gravities and obtain an exact and asymptotically flat black-hole solution, in the presence of non-trivial dilaton configurations. Specifically, by considering the gravitational theory of Euler-Heisenberg non-linear electrodynamics coupled to a dilaton field with specific coupling functions, we perform an extensive analysis of the characteristics of the black hole, including its geodesics for massive particles, the energy conditions, thermodynamical and stability analysis. The inclusion of a dilaton scalar potential in the action can also give rise to asymptotically (A)dS spacetimes and an effective cosmological constant. Moreover, we find that the black hole can be thermodynamically favored when compared to the Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) black hole for those parameters of the model that lead to a larger black-hole horizon for the same mass. Finally, it is observed that the energy conditions of the obtained black hole are indeed satisfied, further validating the robustness of the solution within the theoretical framework, but also implying that this self-gravitating dilaton-non-linear-electrodynamics system constitutes another explicit example of bypassing modern versions of the no-hair theorem without any violation of the energy conditions., Comment: 26 pages, 6 figures, typos corrected, matches published version
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- 2024
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3. Compact objects with primary hair in shift and parity symmetric beyond Horndeski gravities
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Bakopoulos, Athanasios, Chatzifotis, Nikos, and Nakas, Theodoros
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General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
In this work, we delve into the model of the shift symmetric and parity-preserving Beyond Horndeski theory in all its generality. We present an explicit algorithm to extract static and spherically symmetric black holes with primary scalar charge adhering to the conservation of the Noether current emanating from the shift symmetry. We show that when the functionals $G_2$ and $G_4$ of the theory are linearly dependent, analytic homogeneous black-hole solutions exist, which can become regular by virtue of the primary charge contribution. Such geometries can easily enjoy the preservation of the Weak Energy Conditions, elevating them into healthier compact objects than most hairy black holes in modified theories of gravity. Finally, we revisit the concept of disformal transformations as a solution-generating mechanism and discuss the case of generic $G_2$ and $G_4$ functionals., Comment: 14 pages, 2 figures, typos corrected, matches published version
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- 2023
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4. Brine Volatilome Changes Along the Spontaneous Fermentation of Spanish-Style cv. Chalkidiki Green Olives Under High and Low NaCl Conditions
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Alvanoudi, Panagiota, Ordoudi, Stella A., Nakas, Alexandros, Assimopoulou, Andreana N., and Mantzouridou, Fani Th.
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- 2024
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5. Black holes with primary scalar hair
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Bakopoulos, Athanasios, Charmousis, Christos, Kanti, Panagiota, Lecoeur, Nicolas, and Nakas, Theodoros
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General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
We present explicit black holes endowed with primary scalar hair within the shift-symmetric subclass of Beyond Horndeski theories. These solutions depend, in addition to the conventional mass parameter, on a second free parameter encoding primary scalar hair. The properties and characteristics of the solutions at hand are analyzed with varying scalar charge. We observe that when the scalar hair parameter is close to zero or relatively small in comparison to the black hole mass, the solutions closely resemble the Schwarzschild spacetime. As the scalar hair increases, the metric solutions gradually depart from General Relativity. Notably, for a particular relation between mass and scalar hair, the central singularity completely disappears, resulting in the formation of regular black holes or solitons. The scalar field accompanying the solutions is always found to be regular at future or past horizon(s), defining a distinct time direction for each. As a final byproduct of our analysis, we demonstrate the existence of a stealth Schwarschild black hole in Horndeski theory with a non-trivial kinetic term., Comment: 12 pages, 4 figures
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- 2023
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6. Bridging Dimensions: General Embedding Algorithm and Field-Theory Reconstruction in 5D Braneworld Models
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Nakas, Theodoros, Pappas, Thomas D., and Stuchlík, Zdeněk
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General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
We develop a general algorithm that enables the consistent embedding of any four-dimensional static and spherically symmetric geometry into any five-dimensional single-brane braneworld model, characterized by an injective and nonsingular warp factor. Furthermore, we supplement the algorithm by introducing a method that allows one to, in principle, reconstruct 5D field theories that support the aforementioned geometries. This approach is based on a conformal transformation of the metric with the conformal factor being identified with the warp factor of the bulk geometry. The reconstructed theories depend solely on the induced brane geometry, since the warp factor is model-independently represented by a scalar field in the Lagrangian density. As a first application of our reconstruction method, we present for the first time a complete theory that supports the five-dimensional brane-localized extension of the Schwarzschild black hole, for any warp factor. The same method is subsequently utilized to illustrate the process of coherently embedding a de Sitter brane in braneworld models., Comment: 5 pages, 1 figure, extended discussion, references added, version to match the one published in Phys. Rev. D
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- 2023
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7. Direct, age- and gender-specific reference intervals: applying a modified M-estimator of the Yeo-Johnson transformation to clinical real-world data
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Blatter Tobias Ueli, Nakas Christos Theodoros, and Leichtle Alexander Benedikt
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clinical diagnostics ,expectation ranges ,machine learning ,medical statistics ,robust parametric methods ,Medical technology ,R855-855.5 - Abstract
Reference intervals for the general clinical practice are expected to cover non-pathological values, but also reflect the underlying biological variation present in age- and gender-specific patient populations. Reference intervals can be inferred from routine patient data measured in high capacity using parametric approaches. Stratified reference distributions are obtained which may be transformed to normality via e.g. a Yeo-Johnson transformation. The estimation of the optimal transformation parameter for Yeo-Johnson through maximum likelihood can be highly influenced by the presence of outlying observations, resulting in biased reference interval estimates.
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- 2024
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8. A gut microbiota rheostat forecasts responsiveness to PD-L1 and VEGF blockade in mesothelioma
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Zhang, Min, Bzura, Aleksandra, Baitei, Essa Y., Zhou, Zisen, Spicer, Jake B., Poile, Charlotte, Rogel, Jan, Branson, Amy, King, Amy, Barber, Shaun, Kamata, Tamihiro, Dzialo, Joanna, Harber, James, Greystoke, Alastair, Nusrat, Nada, Faulkner, Daniel, Sun, Qianqian, Nolan, Luke, Hahne, Jens C., Scotland, Molly, Walter, Harriet, Darlison, Liz, Morgan, Bruno, Bajaj, Amrita, Brookes, Cassandra, Hollox, Edward J., Lubawska, Dominika, Jama, Maymun, Griffiths, Gareth, Nakas, Apostolos, Kutywayo, Kudzayi, Luo, Jin-Li, Klampatsa, Astero, Cooper, Andrea, Halder, Koirobi, Wells-Jordan, Peter, Zhou, Huiyu, Dudbridge, Frank, Thomas, Anne, Richards, Catherine Jane, Pritchard, Catrin, Yang, Hongji, Barer, Michael, and Fennell, Dean A.
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- 2024
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9. Multi-level profiling of the Fmr1 KO rat unveils altered behavioral traits along with aberrant glutamatergic function
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Ntoulas, George, Brakatselos, Charalampos, Nakas, Gerasimos, Asprogerakas, Michail-Zois, Delis, Foteini, Leontiadis, Leonidas J., Trompoukis, George, Papatheodoropoulos, Costas, Gkikas, Dimitrios, Valakos, Dimitrios, Vatsellas, Giannis, Politis, Panagiotis K., Polissidis, Alexia, and Antoniou, Katerina
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- 2024
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10. Novel exact ultra-compact and ultra-sparse hairy black holes emanating from regular and phantom scalar fields
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Bakopoulos, Athanasios and Nakas, Theodoros
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena ,High Energy Physics - Theory - Abstract
In the framework of a simple gravitational theory that contains a scalar field minimally coupled to gravity, we investigate the emergence of analytic black-hole solutions with non-trivial scalar hair of secondary type. Although it is possible for one to obtain asymptotically (A)dS solutions using our setup, in the context of the present work, we are solely interested in asymptotically flat solutions. At first, we study the properties of static and spherically symmetric black-hole solutions emanating from both regular and phantom scalar fields. We find that the regular-scalar-field-induced solutions are solutions describing ultra-compact black holes, while the phantom scalar fields generate ultra-sparse black-hole solutions. The latter are black holes that can be potentially of very low density since, contrary to ultra-compact ones, their horizon radius is always greater than the horizon radius of the corresponding Schwarzschild black hole of the same mass. Then, we generalize the above static solutions to slowly rotating ones and compute their angular velocities explicitly. Finally, the study of the axial perturbations of the derived solutions takes place, in which we show that there is always a region in the parameter space of the free parameters of our theory that allows the existence of both ultra-compact and ultra-sparse black holes., Comment: 23 pages, 6 figures, an Appendix added, typos corrected, matches published version
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- 2023
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11. Exploring the effect of Pinus halepensis resin quality on the vinification of Retsina by untargeted profile analysis
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Alexandros Nakas, Christina Virgiliou, Dionysia Samara, Eleni Kechri, and Andreana N. Assimopoulou
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retsina ,resinated wine ,pinus halepensis resin ,headspace spme-gc-ms ,lc-ms ,aromatic profile ,phenolic content ,sensory analysis ,Food processing and manufacture ,TP368-456 ,Nutrition. Foods and food supply ,TX341-641 - Abstract
Aim: Three factors that affect the chemical composition and perceptible aroma of Retsina—a distinguished Greek wine, crafted by infusing resin harvested from the Aleppo pine (Pinus halepensis Mill.) into the fermentation process of white or rosé wines—were studied: i) the pine forest altitude (resins were harvested from two distinct forests), ii) the resins’ tapping method (two tapping methods were implemented; a conventional one using a paste of sulfuric acid on the pine trunk as an irritating stimulant, and a natural method by not using any chemical stimulant) and iii) the duration of resin extraction in the must (a short and a long extraction time were investigated). Methods: To study these three factors and their respective interactions, nine vinification protocols were carried out. Must and wine samples were collected at different time points during fermentation, maturation and after bottling, and analyzed by both headspace SPME-GC-MS and RP-LC-TIMS-TOF MS techniques. The findings of the chemical analyses were subsequently correlated with those of sensory analysis conducted. Results: In the case of pine resins harvested using the natural method, neither the forest microclimate, nor the employed duration of resin extraction in the must seem to affect the intensity of the oily character in the wine, which remains at low levels. On the other hand, the results showed that when pine resin is harvested by the conventional method, longer contact times release heavier and more oily aromas into the must. Conclusions: In the case of pine resin collected using the natural method, the extraction time in the wine must and the choice of the harvesting area of the resin do not constitute a factor of quality for the produced wine, but rather a matter of style, in contrast to conventionally harvested resin, where these factors are critical for the resulted quality.
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- 2024
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12. A gut microbiota rheostat forecasts responsiveness to PD-L1 and VEGF blockade in mesothelioma
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Min Zhang, Aleksandra Bzura, Essa Y. Baitei, Zisen Zhou, Jake B. Spicer, Charlotte Poile, Jan Rogel, Amy Branson, Amy King, Shaun Barber, Tamihiro Kamata, Joanna Dzialo, James Harber, Alastair Greystoke, Nada Nusrat, Daniel Faulkner, Qianqian Sun, Luke Nolan, Jens C. Hahne, Molly Scotland, Harriet Walter, Liz Darlison, Bruno Morgan, Amrita Bajaj, Cassandra Brookes, Edward J. Hollox, Dominika Lubawska, Maymun Jama, Gareth Griffiths, Apostolos Nakas, Kudzayi Kutywayo, Jin-Li Luo, Astero Klampatsa, Andrea Cooper, Koirobi Halder, Peter Wells-Jordan, Huiyu Zhou, Frank Dudbridge, Anne Thomas, Catherine Jane Richards, Catrin Pritchard, Hongji Yang, Michael Barer, and Dean A. Fennell
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Science - Abstract
Abstract Malignant mesothelioma is a rare tumour caused by asbestos exposure that originates mainly from the pleural lining or the peritoneum. Treatment options are limited, and the prognosis is dismal. Although immune checkpoint blockade (ICB) can improve survival outcomes, the determinants of responsiveness remain elusive. Here, we report the outcomes of a multi-centre phase II clinical trial (MiST4, NCT03654833) evaluating atezolizumab and bevacizumab (AtzBev) in patients with relapsed mesothelioma. We also use tumour tissue and gut microbiome sequencing, as well as tumour spatial immunophenotyping to identify factors associated with treatment response. MIST4 met its primary endpoint with 50% 12-week disease control, and the treatment was tolerable. Aneuploidy, notably uniparental disomy (UPD), homologous recombination deficiency (HRD), epithelial-mesenchymal transition and inflammation with CD68+ monocytes were identified as tumour-intrinsic resistance factors. The log-ratio of gut-resident microbial genera positively correlated with radiological response to AtzBev and CD8+ T cell infiltration, but was inversely correlated with UPD, HRD and tumour infiltration by CD68+ monocytes. In summary, a model is proposed in which both intrinsic and extrinsic determinants in mesothelioma cooperate to modify the tumour microenvironment and confer clinical sensitivity to AtzBev. Gut microbiota represent a potentially modifiable factor with potential to improve immunotherapy outcomes for individuals with this cancer of unmet need.
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- 2024
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13. Five-dimensional gravitational brane-world models: Solutions for black strings and black holes
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Nakas, Theodoros
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General Relativity and Quantum Cosmology ,High Energy Physics - Theory - Abstract
In the context of this dissertation, we study the emergence of black-string and black-hole solutions in the framework of five-dimensional braneworld models. The main motivation for studying such theories stems from the Randall-Sundrum model, which was formulated by Lisa Randall and Raman Sundrum back in 1999. We investigate thoroughly the physical characteristics of analytic solutions which concern both black strings and five-dimensional localized black holes. To be more precise, the black-string solutions emerge in the context of a five-dimensional scalar-tensor theory, where the brane line-element is found to describe a Schwarzschild-(anti-)de Sitter spacetime. The cases of de Sitter, anti-de Sitter and Minkowski branes are examined separately and in great detail. As far as the five-dimensional black holes are concerned, at first, we present an "algorithm" that one may use in order to construct from first principles the geometry of analytic and exponentially localized five-dimensional braneworld black holes. In each case, the point-like singularity of the black hole lies entirely on the 3-brane, while its event horizon is exponentially localized close to the 3-brane thus exhibiting a pancake shape. In the first case, the induced line-element on the brane assumes the form of the Schwarzschild solution while the bulk geometry is effectively AdS$_5$ outside the horizon. In the second case, the induced brane geometry is described by the Reissner-Nordstr\"{o}m-(A)dS line-element, where a careful classification of the horizons takes place as well. In both cases, the derived geometry is supported by an anisotropic fluid in the bulk described only by two independent components, the energy density and tangential pressure, whereas no matter needs to be introduced on the brane for its consistent embedding in the bulk., Comment: PhD Dissertation, 261 pages. It includes a titlepage, a prologue and an extended summary in Greek
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- 2022
14. Fostering physical activity-related health competence after bariatric surgery with a multimodal exercise programme: A randomised controlled trial
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Schmid, Julia, Schorno, Nina, Groux, André, Giachino, Daniel, Zehetner, Jörg, Nett, Philip, and Nakas, Christos T
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Exercise -- Health aspects ,Obesity -- Surgery ,Self-control -- Health aspects -- Physiological aspects ,Psychology and mental health - Abstract
Regular physical activity (PA) supports the long-term success of bariatric surgery. However, integrating health-enhancing physical activity in daily life requires specific competences. In this study, we evaluated a multimodal exercise programme to build these competences. Forty adults who underwent bariatric surgery were randomised to a multimodal exercise programme or control group. Primary outcomes were the facets of PA-related health competences, namely the control competence for physical training, PA-specific affect regulation, motivational competence and PA-specific self-control. Secondary outcomes were PA behaviour and subjective vitality. Outcomes were assessed before, directly after the intervention and at 3 months follow-up. Significant treatment effects were found for control competence for physical training and PA-specific self-control but not for PA-specific affect regulation and motivational competence. Significant treatment effects were further observed for self-reported exercise and subjective vitality, all in favour of the intervention group. In contrast, no treatment effect was found for device-based PA. Overall, this study provides a foundation for future research to optimise long-term post bariatric surgery outcomes., Author(s): Julia Schmid [sup.1] , Nina Schorno [sup.1] , André Groux [sup.2] , Daniel Giachino [sup.3] , Jörg Zehetner [sup.4] , Philip Nett [sup.5] , Christos T Nakas [sup.6] , [...]
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- 2023
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15. Multi-level profiling of the Fmr1 KO rat unveils altered behavioral traits along with aberrant glutamatergic function
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George Ntoulas, Charalampos Brakatselos, Gerasimos Nakas, Michail-Zois Asprogerakas, Foteini Delis, Leonidas J. Leontiadis, George Trompoukis, Costas Papatheodoropoulos, Dimitrios Gkikas, Dimitrios Valakos, Giannis Vatsellas, Panagiotis K. Politis, Alexia Polissidis, and Katerina Antoniou
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Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Abstract
Abstract Fragile X syndrome (FXS) is the most common cause of inherited intellectual disabilities and the most prevalent monogenic cause of autism. Although the knockout (KO) of the Fmr1 gene homolog in mice is primarily used for elucidating the neurobiological substrate of FXS, there is limited association of the experimental data with the pathophysiological condition in humans. The use of Fmr1 KO rats offers additional translational validity in this regard. Therefore, we employed a multi-level approach to study the behavioral profile and the glutamatergic and GABAergic neurotransmission status in pathophysiology-associated brain structures of Fmr1 KO rats, including the recordings of evoked and spontaneous field potentials from hippocampal slices, paralleled with next-generation RNA sequencing (RNA-seq). We found that these rats exhibit hyperactivity and cognitive deficits, along with characteristic bidirectional glutamatergic and GABAergic alterations in the prefrontal cortex and the hippocampus. These results are coupled to affected excitability and local inhibitory processes in the hippocampus, along with a specific transcriptional profile, highlighting dysregulated hippocampal network activity in KO rats. Overall, our data provide novel insights concerning the biobehavioral profile of FmR1 KO rats and translationally upscales our understanding on pathophysiology and symptomatology of FXS syndrome.
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- 2024
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16. Impact of Stabilization Splint Therapy on Orthodontic Diagnosis in Patients with Signs and Symptoms of Temporomandibular Disorder
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Kenan Demirovic, Vildana Dzemidzic, and Enita Nakas
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centric relation ,maximum intercuspation ,lateral cephalogram ,stabilization splint ,Biology (General) ,QH301-705.5 - Abstract
Background/Objectives: The relation between the orthopedic temporomandibular joint (TMJ) instability and temporomandibular disorder (TMD) most commonly remain unrecognized by orthodontists. In this study we aimed to evaluate the dentofacial characteristics and temporomandibular disorder symptomatology of patients with orthopedic instability before and after deprogramming with a stabilization splint. Methods: Sixty patients with the signs and symptoms of TMD were assessed using the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) and underwent stabilization splint therapy to place the condyles in a more stable musculoskeletal position. The extent of condylar displacement was evaluated using the condylar position indicator (CPI). Sixteen angular and linear hard tissue landmarks were traced and compared from lateral cephalograms taken in the maximum intercuspation (MI) position before, and in the centric relation (CR) position after, the splint therapy. Results: Following the splint therapy, the signs and symptoms of TMD were significantly reduced or completely eliminated in more than 90% of patients. Compared with the values registered before the splint therapy, a significant reduction in the mean values of condylar displacement was observed on both sides of the vertical (p < 0.001), horizontal (p < 0.05), and transverse (p < 0.001) planes of space after the splint therapy. A comparison of pre- and post-splint lateral cephalograms revealed that, following the splint therapy, the mandible moved more posteriorly and rotated in a more clockwise direction. Conclusions: In patients with orthopedic instability and the signs and symptoms of TMD, muscle deprogramming with a stabilization splint therapy is highly recommended to improve the health of the temporomandibular joint and masticatory structures and contribute to a more correct orthodontic diagnosis.
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- 2024
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17. The importance of landscape and fire-history as factors explaining post-fire vegetation recovery in a Mediterranean island using Sentinel-2 satellite data
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Koutsias, Nikos, Panourgia, Kyriaki, Nakas, Georgios, and Petanidou, Theodora
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- 2024
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18. Lung function parameters are associated with acute mountain sickness and are improved at high and extreme altitude
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Reiser, Reto, Brill, Anne-Kathrin, Nakas, Christos T., Hefti, Urs, Berger, David, Perret Hoigné, Eveline, Kabitz, Hans-Joachim, Merz, Tobias M., and Pichler Hefti, Jacqueline
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- 2024
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19. Exploring the host factors affecting asymptomatic Plasmodium falciparum infection: insights from a rural Burkina Faso study
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Neyer, Peter J., Kaboré, Bérenger, Nakas, Christos T., Hartmann, Britta, Post, Annelies, Diallo, Salou, Tinto, Halidou, Hammerer-Lercher, Angelika, Largiadèr, Carlo R., van der Ven, Andre J., and Huber, Andreas R.
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- 2023
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20. The construction, use and evolution of the Hellenistic and Roman harbours of the Aegean
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Nakas, Ioannis D.
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GN Anthropology ,VM Naval architecture. Shipbuilding. Marine engineering - Abstract
One of the fundamental premises on which the successful function of harbours as centres of commerce and interaction is based is their ability to accommodate and handle ships and their cargoes. This is especially the case during periods in which seaborne trade and travel acquire a major role like the Hellenistic and Roman ones. But, despite the important developments in the study of the harbours of the period, their operation as ship havens and the practicalities of ship and cargo handling have largely eluded the attention of previous scholarship that has addressed the operation of ancient harbours mainly through their history and architecture. The primary aim of this thesis is to understand the harbours of the Hellenistic and Roman Aegean vis-à-vis their relationship with ships and seamanship and the practical issues related with it. In order to do so I approach harbours 'through the eyes of the mariners', devising a new methodology that combines data on ship typology, size and handling with the reconstruction of the three harbours chosen as case studies (Delos, Lechaion and Kenchreai). By employing this methodology I address, in an innovative and inclusive manner, the relationship of harbours with ship and cargo traffic, an essential practical aspect of their operation that largely dictated their function and development. Through the combined study of ships and harbours a complicated image of versatility appears. The three case study harbours were in their majority small, shallow and exposed areas, often fragmented into various smaller anchorages. They were also related with sandy beaches, ideal for the accommodation and beaching of small vessels and lighters but not of ships of medium and large capacity. Docking facilities were few, exposed and most probably reserved for stone and marble cargoes. Anchoring in the open and employing lighters was most likely the main method of using these harbours, allowing ships to sail more easily from and to harbour basins, change anchorages and avoid the entanglement in small and often cramped spaces. Harbour works in the sea were few as well as technologically simple, with a focus on the creation of monumental commercial infrastructures on land instead. Functionality and adaptability were the main elements in the operation of the harbours studied, which despite their relative simplicity still functioned perfectly as commercial centres, marketplaces and maritime façades of cities, states and regions. The successful application of the methodology of this thesis to the case study harbours highlights the possibilities it has concerning the better and more inclusive understanding of harbours as human spaces. It also underlines its dynamics as a methodological tool that can be applied in other contemporary sites, historical periods and different geographical regions.
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- 2022
21. Analytic and asymptotically flat hairy (ultra-compact) black-hole solutions and their axial perturbations
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Bakopoulos, Athanasios and Nakas, Theodoros
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena ,High Energy Physics - Theory - Abstract
In this work, we consider a very simple gravitational theory that contains a scalar field with its kinetic and potential terms minimally coupled to gravity, while the scalar field is assumed to have a coulombic form. In the context of this theory, we study an analytic, asymptotically flat, and regular (ultra-compact) black-hole solutions with non-trivial scalar hair of secondary type. At first, we examine the properties of the static and spherically symmetric black-hole solution -- firstly appeared in 1504.08209 [gr-qc] -- and we find that in the causal region of the spacetime the stress-energy tensor, needed to support our solution, satisfies the strong energy conditions. Then, by using the slow-rotating approximation, we generalize the static solution into a slowly rotating one, and we determine explicitly its angular velocity $\omega(r)$. We also find that the angular velocity of our ultra-compact solution is always larger compared to the angular velocity of the corresponding equally massive slow-rotating Schwarzschild black hole. In addition, we investigate the axial perturbations of the derived solutions by determining the Schr\"{o}dinger-like equation and the effective potential. We show that there is a region in the parameter space of the free parameters of our theory, which allows for the existence of stable ultra-compact black hole solutions. Specifically, we calculate that the most compact and stable black hole solution is 0.551 times smaller than the Schwarzschild one, while it rotates 2.491 times faster compared to the slow-rotating Schwarzschild black hole. Finally, we present without going into details the generalization of the derived asymptotically flat solutions to asymptotically (A)dS solutions., Comment: 23 pages, 8 figures, title changed, analysis extended, references updated, typos corrected, matches published version (to appear in JHEP)
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- 2021
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22. Exploring the host factors affecting asymptomatic Plasmodium falciparum infection: insights from a rural Burkina Faso study
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Peter J. Neyer, Bérenger Kaboré, Christos T. Nakas, Britta Hartmann, Annelies Post, Salou Diallo, Halidou Tinto, Angelika Hammerer-Lercher, Carlo R. Largiadèr, Andre J. van der Ven, and Andreas R. Huber
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Haemoglobin variants ,Malaria ,Nutrition ,Arctic medicine. Tropical medicine ,RC955-962 ,Infectious and parasitic diseases ,RC109-216 - Abstract
Abstract Background Asymptomatic Plasmodium falciparum parasitaemia forms a reservoir for the transmission of malaria disease in West Africa. Certain haemoglobin variants are known to protect against severe malaria infection. However, data on the potential roles of haemoglobin variants and nongenetic factors in asymptomatic malaria infection is scarce and controversial. Therefore, this study investigated the associations of iron homeostasis, inflammation, nutrition, and haemoglobin mutations with parasitaemia in an asymptomatic cohort from a P. falciparum-endemic region during the high transmission season. Methods A sub-study population of 688 asymptomatic individuals (predominantly children and adolescents under 15 years, n = 516) from rural Burkina Faso previously recruited by the NOVAC trial (NCT03176719) between June and October 2017 was analysed. Parasitaemia was quantified with conventional haemocytometry. The haemoglobin genotype was determined by reverse hybridization assays targeting a selection of 21 HBA and 22 HBB mutations. Demographics, inflammatory markers (interleukins 6 and 10, hepcidin), nutritional status (mid upper-arm circumference and body mass index), and anaemia (total haemoglobin, ferritin, soluble transferrin receptor) were assessed as potential predictors through logistic regression. Results Malaria parasites were detected in 56% of subjects. Parasitaemia was associated most strongly with malnutrition. The effect size increased with malnutrition severity (OR = 6.26, CI95: 2.45–19.4, p
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- 2023
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23. Electronic recording of lifetime locomotory activity patterns of adult medflies
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Rodovitis, Vasilis G, Papanastasiou, Stella A, Bataka, Evmorfia P, Nakas, Christos T, Koulousis, Nikos A, Carey, James R, and Papadopoulos, Nikos T
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Biological Sciences ,Ecology ,Aging ,Animals ,Ceratitis capitata ,Diet ,Electronics ,Female ,Fertility ,Male ,General Science & Technology - Abstract
Age-specific and diurnal patterns of locomotory activity, can be considered as biomarkers of aging in model organisms and vary across the lifetime of individuals. Τhe Mediterranean fruit fly (medfly), Ceratitis capitata, is a commonly used model-species in studies regarding demography and aging. In the present study, we introduce a modification of the automated locomotory activity electronic device LAM25system (Locomotory Activity Monitor)-Trikinetics, commonly used in short time studies, to record the daily locomotory activity patterns of adult medflies throughout the life. Additionally, fecundity rates and survival of adult medflies were recorded. Male and female medflies were kept in the system tubes and had access to an agar-based gel diet, which provided water and nutrients. The locomotory activity was recorded at every minute by three monitors in the electronic device. The locomotory activity of females was higher than that of males across the different ages. For both sexes locomotory rates were high during the first 20 days of the adult life and decreased in older ages. The activity of males was high in the morning and late afternoon hours, while that of females was constantly high throughout the photophase. Negligible locomotory activity was recorded for both sexes during the nighttime. Males outlived females. Fecundity of females was higher in younger ages. Our results support the adoption of LAM25system in studies addressing aging of insects using medfly as a model organism.
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- 2022
24. Analytic and exponentially localized brane-world Reissner-Nordstr\'{o}m-AdS solution: a top-down approach
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Nakas, Theodoros and Kanti, Panagiota
- Subjects
High Energy Physics - Theory ,Astrophysics - High Energy Astrophysical Phenomena ,General Relativity and Quantum Cosmology - Abstract
In this work, we construct a five-dimensional spherically-symmetric, charged and asymptotically Anti-de Sitter black hole with its singularity being point-like and strictly localised on our brane. In addition, the induced brane geometry is described by a Reissner-Nordstr\"{o}m-(A)dS line-element. We perform a careful classification of the horizons, and demonstrate that all of them are exponentially localised close to the brane thus exhibiting a pancake shape. The bulk gravitational background is everywhere regular, and reduces to an AdS$_5$ spacetime right outside the black-hole event horizon. This geometry is supported by an anisotropic fluid with only two independent components, the energy density $\rho_E$ and tangential pressure $p_2$. All energy conditions are respected close to and on our brane, but a local violation takes place within the event horizon regime in the bulk. A tensor-vector-scalar field-theory model is built in an attempt to realise the necessary bulk matter, however, in order to do so, both gauge and scalar degrees of freedom need to turn phantom-like at the bulk boundary. The study of the junction conditions reveals that no additional matter needs to be introduced on the brane for its consistent embedding in the bulk geometry apart from its constant, positive tension. We finally compute the effective gravitational equations on the brane, and demonstrate that the Reissner-Nordstr\"{o}m-(A)dS geometry on our brane is caused by the combined effect of the five-dimensional geometry and bulk matter with its charge being in fact a tidal charge., Comment: 25 pages, 6 figures, analysis extended, references updated, matches published version
- Published
- 2021
- Full Text
- View/download PDF
25. Metabolic Aspects of Lentil–Fusarium Interactions
- Author
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Chrysanthi Foti, Antonios Zambounis, Evmorfia P. Bataka, Chrysanthi Kalloniati, Evangelia Panagiotaki, Christos T. Nakas, Emmanouil Flemetakis, and Ourania I. Pavli
- Subjects
lentil ,Fusarium oxysporum f. sp. lentis ,Fol-inoculation ,metabolic response ,GC-MS ,metabolic biomarkers ,Botany ,QK1-989 - Abstract
Fusarium oxysporum f. sp. lentis (Fol) is considered the most destructive disease for lentil (Lens culinaris Medik.) worldwide. Despite the extensive studies elucidating plants’ metabolic response to fungal agents, there is a knowledge gap in the biochemical mechanisms governing Fol-resistance in lentil. Τhis study aimed at comparatively evaluating the metabolic response of two lentil genotypes, with contrasting phenotypes for Fol-resistance, to Fol-inoculation. Apart from gaining insights into the metabolic reprogramming in response to Fol-inoculation, the study focused on discovering novel biomarkers to improve early selection for Fol-resistance. GC-MS-mediated metabolic profiling of leaves and roots was employed to monitor changes across genotypes and treatments as well as their interaction. In total, the analysis yielded 178 quantifiable compounds, of which the vast majority belonged to the groups of carbohydrates, amino acids, polyols and organic acids. Despite the magnitude of metabolic fluctuations in response to Fol-inoculation in both genotypes under study, significant alterations were noted in the content of 18 compounds, of which 10 and 8 compounds referred to roots and shoots, respectively. Overall data underline the crucial contribution of palatinitol and L-proline in the metabolic response of roots and shoots, respectively, thus offering possibilities for their exploitation as metabolic biomarkers for Fol-resistance in lentil. To the best of our knowledge, this is the first metabolomics-based approach to unraveling the effects of Fol-inoculation on lentil’s metabolome, thus providing crucial information related to key aspects of lentil–Fol interaction. Future investigations in metabolic aspects of lentil–Fol interactions will undoubtedly revolutionize the search for metabolites underlying Fol-resistance, thus paving the way towards upgrading breeding efforts to combat fusarium wilt in lentil.
- Published
- 2024
- Full Text
- View/download PDF
26. Localized brane-world black hole analytically connected to an AdS$_5$ boundary
- Author
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Nakas, Theodoros and Kanti, Panagiota
- Subjects
High Energy Physics - Theory ,General Relativity and Quantum Cosmology ,High Energy Physics - Phenomenology - Abstract
We construct from first principles the geometry of an analytic, exponentially localized five-dimensional brane-world black hole. The black-hole singularity lies entirely on the 3-brane, while the event horizon is shown to have a pancake shape. The induced line-element on the brane assumes the form of the Schwarzschild solution while the bulk geometry is effectively AdS$_5$ outside the horizon. The derived geometry is supported by an anisotropic fluid in the bulk described only by two independent components, the energy density and tangential pressure, whereas no matter needs to be introduced on the brane for its consistent embedding in the bulk., Comment: 7 pages, 3 figures, version to appear in Phys. Lett. B, typos corrected, references updated, appendix added
- Published
- 2020
- Full Text
- View/download PDF
27. 5G Core PFCP Intrusion Detection Dataset.
- Author
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George Amponis, Panagiotis I. Radoglou-Grammatikis, George Nakas, Sotirios K. Goudos, Vasileios Argyriou, Thomas Lagkas, and Panagiotis G. Sarigiannidis
- Published
- 2023
- Full Text
- View/download PDF
28. 5GCIDS: An Intrusion Detection System for 5G Core with AI and Explainability Mechanisms.
- Author
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Panagiotis I. Radoglou-Grammatikis, George Nakas, George Amponis, Sofia Giannakidou, Thomas Lagkas, Vasileios Argyriou, Sotirios K. Goudos, and Panagiotis G. Sarigiannidis
- Published
- 2023
- Full Text
- View/download PDF
29. 5G-Fuzz: An Attack Generator for Fuzzing 5GC, using Generative Adversarial Networks.
- Author
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George Nakas, Panagiotis I. Radoglou-Grammatikis, George Amponis, Thomas Lagkas, Vasileios Argyriou, Sotirios K. Goudos, and Panagiotis G. Sarigiannidis
- Published
- 2023
- Full Text
- View/download PDF
30. The dynamic range of immunoassays for heparin-induced thrombocytopenia
- Author
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Nilius, Henning, Naas, Samra, Studt, Jan-Dirk, Tsakiris, Dimitrios A., Greinacher, Andreas, Mendez, Adriana, Schmidt, Adrian, Wuillemin, Walter A., Gerber, Bernhard, Vishnu, Prakash, Graf, Lukas, Kremer Hovinga, Johanna A., Bakchoul, Tamam, Nakas, Christos, and Nagler, Michael
- Published
- 2024
- Full Text
- View/download PDF
31. Counter-regulatory responses to postprandial hypoglycaemia in patients with post-bariatric hypoglycaemia vs surgical and non-surgical control individuals
- Author
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Tripyla, Afroditi, Herzig, David, Reverter-Branchat, Gemma, Pavan, Jacopo, Schiavon, Michele, Eugster, Philippe J., Grouzmann, Eric, Nakas, Christos T., Sauvinet, Valérie, Meiller, Laure, Zehetner, Joerg, Giachino, Daniel, Nett, Philipp, Gawinecka, Joanna, Del Favero, Simone, Thomas, Andreas, Thevis, Mario, Dalla Man, Chiara, and Bally, Lia
- Published
- 2023
- Full Text
- View/download PDF
32. Deployment of an Automated Method Verification-Graphical User Interface (MV-GUI) Software
- Author
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Priyanka Nagabhushana, Cyrill Rütsche, Christos Nakas, and Alexander B. Leichtle
- Subjects
method verification GUI ,graphical user interface ,statistical analysis ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 ,Computer applications to medicine. Medical informatics ,R858-859.7 - Abstract
Clinical laboratories frequently conduct method verification studies to ensure that the process meets quality standards for its intended use, such as patient testing. They play a pivotal role in healthcare, but issues such as accurate statistical assessment and reporting of verification data often make these studies challenging. Missteps can lead to false conclusions about method performance, risking patient safety or leading to incorrect diagnoses. Despite a requirement for accredited labs to document method performance, existing solutions are often expensive and complex. Addressing these issues, we present Method Verification-Graphical User Interface (MV-GUI), a software package designed for ease of use. It is platform-independent, capable of statistical analysis, and generates accreditation-ready reports swiftly and efficiently. Users can input patient data from one or more .CSV files, and MV-GUI will produce comprehensive reports, including statistical comparison tables, regression plots, and Bland–Altman plots. While method validation, which establishes the performance of new diagnostic tools, remains a crucial concern for manufacturers, MV-GUI primarily streamlines the method verification process. The software aids both medical practitioners and researchers and is designed to be user-friendly, even for non-experienced users. Requiring no internet connection, MV-GUI can operate in restricted IT environments, making method verification widely accessible and efficient.
- Published
- 2023
- Full Text
- View/download PDF
33. Fermions and baryons as open-string states from brane junctions
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Nakas, Theodoros and Rigatos, Konstantinos S.
- Subjects
High Energy Physics - Theory ,High Energy Physics - Phenomenology - Abstract
There has been recent progress towards understanding the dynamics of world-volume fermions that arise as open-string modes from brane intersections in the probe limit $(N_f/N_c \rightarrow 0)$. In this work we consider all possible BPS brane junctions in Type IIA/B supergravity theories. We study in detail the dynamics of these states by deriving their equations of motion. We show the expected degeneracy of the bosonic and fermionic fluctuations as is expected due to the preserved supersymmetry. We also give some supporting evidence and refine the notion that these states can effectively describe baryon operators in a certain regime of the field theory's parameter space. Our piece of evidence is the demonstration of the expected scaling of the mass in the large-$N_c$ limit of the theory for these fermionic states; $M^2 \sim N^2_c$. Finally, we explain analytically the avoided level crossing that was observed in a previous work after the inclusion of higher dimension operators in the field theory., Comment: 37 pages, 9 tables, 4 figures, typos corrected, JHEP version
- Published
- 2020
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- View/download PDF
34. Incorporating Physical Constraints in Braneworld Black-String Solutions for a Minkowski Brane in Scalar-Tensor Gravity
- Author
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Nakas, Theodoros, Kanti, Panagiota, and Pappas, Nikolaos
- Subjects
High Energy Physics - Theory ,General Relativity and Quantum Cosmology - Abstract
In the framework of a general scalar-tensor theory, where the scalar field is non-minimally coupled to the five-dimensional Ricci scalar curvature, we investigate the emergence of complete brane-world solutions. By assuming a variety of forms for the coupling function, we solve the field equations in the bulk, and determine in an analytic way the form of the gravitational background and scalar field in each case. The solutions are always characterized by a regular scalar field, a finite energy-momentum tensor, and an exponentially decaying warp factor even in the absence of a negative bulk cosmological constant. The space-time on the brane is described by the Schwarzschild solution leading to either a non-homogeneous black-string solution in the bulk, when the mass parameter $M$ is non-zero, or a regular anti-de Sitter space-time, when $M=0$. We construct physically-acceptable solutions by demanding in addition a positive effective gravitational constant on our brane, a positive total energy-density for our brane and the validity of the weak energy condition in the bulk. We find that, although the theory does not allow for all three conditions to be simultaneously satisfied, a plethora of solutions emerge which satisfy the first two, and most fundamental, conditions., Comment: 44 pages, 18 figures, typos corrected, detailed references, published in Physical Review D
- Published
- 2020
- Full Text
- View/download PDF
35. Correction: The BioRef Infrastructure, a Framework for Real-Time, Federated, Privacy-Preserving, and Personalized Reference Intervals: Design, Development, and Application
- Author
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Tobias Ueli Blatter, Harald Witte, Jules Fasquelle-Lopez, Christos Theodoros Nakas, Jean Louis Raisaro, and Alexander Benedikt Leichtle
- Subjects
Computer applications to medicine. Medical informatics ,R858-859.7 ,Public aspects of medicine ,RA1-1270 - Published
- 2023
- Full Text
- View/download PDF
36. Transcriptional perturbation of protein arginine methyltransferase-5 exhibits MTAP-selective oncosuppression.
- Author
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Busacca, Sara, Zhang, Qi, Sharkey, Annabel, Dawson, Alan G, Moore, David A, Waller, David A, Nakas, Apostolos, Jones, Carolyn, Cain, Kelvin, Luo, Jin-Li, Salcedo, Adriana, Salaroglio, Iris Chiara, Riganti, Chiara, Le Quesne, John, John, Tom, Boutros, Paul C, Zhang, Shu-Dong, and Fennell, Dean A
- Subjects
Genetics ,Lung ,5.1 Pharmaceuticals ,2.1 Biological and endogenous factors - Abstract
We hypothesized that small molecule transcriptional perturbation could be harnessed to target a cellular dependency involving protein arginine methyltransferase 5 (PRMT5) in the context of methylthioadenosine phosphorylase (MTAP) deletion, seen frequently in malignant pleural mesothelioma (MPM). Here we show, that MTAP deletion is negatively prognostic in MPM. In vitro, the off-patent antibiotic Quinacrine efficiently suppressed PRMT5 transcription, causing chromatin remodelling with reduced global histone H4 symmetrical demethylation. Quinacrine phenocopied PRMT5 RNA interference and small molecule PRMT5 inhibition, reducing clonogenicity in an MTAP-dependent manner. This activity required a functional PRMT5 methyltransferase as MTAP negative cells were rescued by exogenous wild type PRMT5, but not a PRMT5E444Q methyltransferase-dead mutant. We identified c-jun as an essential PRMT5 transcription factor and a probable target for Quinacrine. Our results therefore suggest that small molecule-based transcriptional perturbation of PRMT5 can leverage a mutation-selective vulnerability, that is therapeutically tractable, and has relevance to 9p21 deleted cancers including MPM.
- Published
- 2021
37. Adaptations on the Use of p-Values for Statistical Inference: An Interpretation of Messages from Recent Public Discussions
- Author
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Eleni Verykouki and Christos T. Nakas
- Subjects
bootstrap distribution ,confidence intervals ,effect size ,hypothesis testing ,Shannon’s information transform ,Statistics ,HA1-4737 - Abstract
P-values have played a central role in the advancement of research in virtually all scientific fields; however, there has been significant controversy over their use. “The ASA president’s task force statement on statistical significance and replicability” has provided a solid basis for resolving the quarrel, but although the significance part is clearly dealt with, the replicability part raises further discussions. Given the clear statement regarding significance, in this article, we consider the validity of p-value use for statistical inference as de facto. We briefly review the bibliography regarding the relevant controversy in recent years and illustrate how already proposed approaches, or slight adaptations thereof, can be readily implemented to address both significance and reproducibility, adding credibility to empirical study findings. The definitions used for the notions of replicability and reproducibility are also clearly described. We argue that any p-value must be reported along with its corresponding s-value followed by (1−α)% confidence intervals and the rejection replication index.
- Published
- 2023
- Full Text
- View/download PDF
38. BAP1 loss induces mitotic defects in mesothelioma cells through BRCA1-dependent and independent mechanisms
- Author
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Singh, Anita, Busacca, Sara, Gaba, Aarti, Sheaff, Michael, Poile, Charlotte, Nakas, Apostolos, Dzialo, Joanna, Bzura, Aleksandra, Dawson, Alan G., Fennell, Dean A., and Fry, Andrew M.
- Published
- 2023
- Full Text
- View/download PDF
39. ROC Regression
- Author
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Nakas, Christos T, primary, Bantis, Leonidas E, additional, and Gatsonis, Constantine A, additional
- Published
- 2023
- Full Text
- View/download PDF
40. Measures of Diagnostic and Predictive Performance
- Author
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Nakas, Christos T, primary, Bantis, Leonidas E, additional, and Gatsonis, Constantine A, additional
- Published
- 2023
- Full Text
- View/download PDF
41. Statistical Inference for the ROC Curve
- Author
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Nakas, Christos T, primary, Bantis, Leonidas E, additional, and Gatsonis, Constantine A, additional
- Published
- 2023
- Full Text
- View/download PDF
42. The ROC Surface and k-class Classification for k > 2
- Author
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Nakas, Christos T, primary, Bantis, Leonidas E, additional, and Gatsonis, Constantine A, additional
- Published
- 2023
- Full Text
- View/download PDF
43. Introduction
- Author
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Nakas, Christos T, primary, Bantis, Leonidas E, additional, and Gatsonis, Constantine A, additional
- Published
- 2023
- Full Text
- View/download PDF
44. Missing Data and Errors-in-Variables in ROC Analysis
- Author
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Nakas, Christos T, primary, Bantis, Leonidas E, additional, and Gatsonis, Constantine A, additional
- Published
- 2023
- Full Text
- View/download PDF
45. Comparing ROC Curves
- Author
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Nakas, Christos T, primary, Bantis, Leonidas E, additional, and Gatsonis, Constantine A, additional
- Published
- 2023
- Full Text
- View/download PDF
46. New Black-String Solutions for an Anti-de Sitter Brane in Scalar-Tensor Gravity
- Author
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Nakas, Theodoros, Pappas, Nikolaos, and Kanti, Panagiota
- Subjects
High Energy Physics - Theory ,General Relativity and Quantum Cosmology ,High Energy Physics - Phenomenology - Abstract
We consider a five-dimensional theory with a scalar field non-minimally-coupled to gravity, and we look for novel black-string solutions in the bulk. By appropriately choosing the non-minimal coupling function of the scalar field, we analytically solve the gravitational and scalar-field equations in the bulk to produce black-string solutions that describe a Schwarzschild-Anti-de Sitter space-time on the brane. We produce two complete such solutions that are both characterised by a regular scalar field, a localised-close-to-our brane energy-momentum tensor and a negative-definite, non-trivial bulk potential that may support by itself the warping of the space-time even in the absence of the traditional, negative, bulk cosmological constant. Despite the infinitely-long string singularity in the bulk, the four-dimensional effective theory on the brane is robust with the effective gravity scale being related to the fundamental one and the warping scale. It is worth noting that if we set the mass of the black hole on the brane equal to zero, the black string disappears leaving behind a regular brane-world model with only a true singularity at the boundary of the fifth dimension., Comment: 28 pages, 10 figures, typos corrected, detailed references, published in Physical Review D
- Published
- 2019
- Full Text
- View/download PDF
47. Differential response to larval crowding of a long‐ and a short‐lived medfly biotype
- Author
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Diamantidis, Alexandros D, Ioannou, Charalampos S, Nakas, Christos T, Carey, James R, and Papadopoulos, Nikos T
- Subjects
Zoology ,Ecology ,Evolutionary Biology ,Biological Sciences ,Aging ,Animals ,Ceratitis capitata ,Larva ,Longevity ,Oogenesis ,Population Density ,Stress ,Physiological ,life history traits ,longevity ,plastic response ,plasticity ,stressful conditions ,Evolutionary biology - Abstract
Response of endophytic fruit fly species (Tephritidae) to larval crowding is a form of scramble competition that may affect important life history traits of adults, such as survival and reproduction. Recent empirical evidence demonstrates large differences in adult life history traits, especially longevity, among Mediterranean fruit fly (Ceratitis capitata; "medfly") biotypes obtained from different regions of the world. However, whether the evolution of long lifespan is associated with response to stress induced by larval crowding has not been fully elucidated. We investigated, under constant laboratory conditions, the response of a short- and a long-lived medfly biotypes to stress induced by larval crowding. Survival and development of larvae and pupae and the size of resulting pupae were recorded. The lifespan and age-specific egg production patterns of the obtained adults were recorded. Our findings reveal that increased larval density reduced immature survival (larvae and pupae) in the short-lived biotype but had rather neutral effects on the longed-lived one. Only larvae of the long-lived biotype were capable of prolonging their developmental duration under the highest crowding regime to successfully pupate and emerge as adults. Response of emerging adults to larvae crowding conditions was similar in the two medfly biotypes. Those individuals emerging from high larval density regimes had reduced longevity and fecundity. Long-lived biotype individuals, however, appeared to suffer a higher cost in longevity compared with the short-lived one. The importance of our findings to understand the evolution of long lifespan is discussed.
- Published
- 2020
48. Nutrient intake of captive small Indian civet (Viverricula indica) in Chiang Mai Zoo and Demonstrated Farming Under Royal Project in Ban Dong Yen, Thailand
- Author
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Theerapong Nakas, Phichit Chitmin, Ratchaneewan Punyatong, Runglawan Sangsuri, Sasiwimon Jatoorapattarawong, Pattaranun Whongchai, Tharathep Phopheng, Pradit Wonglungkar, Watcharaphong Kittichroenwit, and Montri Punyatong
- Subjects
Veterinary medicine ,SF600-1100 - Abstract
Here we examined the feed and nutrient intake of captive small Indian civets (Viverricula indica) housed at the Chiang Mai Zoo (CMZ) and Demonstrated Farming Under Royal Project (DYF) in Ban Dong Yen in Thailand. The feed type and intake was recorded for 4 males and 5 females at both CMZ and DYF. Feed samples were collected for chemical analysis and nutrient intake was calculated in terms of dry matter (DM) to compare CMZ and DYF. There were 11 and 5 feed types at CMZ and DYF, respectively. DM intake of small Indian civets at CMZ was significantly lower than at DYF (32.84 ± 0.852 % vs 38.90 ± 0.184 %; P
- Published
- 2023
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49. Online Identification of Cascading Events in Power Systems With Renewable Generation Using Measurement Data and Machine Learning
- Author
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Georgios A. Nakas, Alara Dirik, Panagiotis N. Papadopoulos, Amarsagar Reddy Ramapuram Matavalam, Oliver Paul, and Dimitrios Tzelepis
- Subjects
Cascading failures ,dynamic simulation ,machine learning ,phasor measurement units ,renewable generation ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
This paper introduces a framework for online identification of cascading events in power systems with renewable generation, based on supervised machine learning techniques and measurement data. Cascading events are low-probability, high-impact events, the propagation of which can lead even to large-scale blackouts, with severe consequences to society. The proposed methodology is based on Long-short term memory networks, considering uncertainties associated with renewable generation, system loading and initial contingencies. By utilizing time-series measurement data, the proposed method can predict the appearance of cascading events, as defined by the discrete action of protection devices which can capture voltage, frequency or transient instability related dynamic phenomena. The proposed framework is applied on a modified version of the IEEE-39 bus model incorporating detailed dynamic renewable generation and protection devices implementations. Results highlight that the suggested method can successfully identify cases with cascading events with up to 95.6% accuracy and with an average inference time of 0.042s, taking into account practical considerations related to phasor measurement units, such as availability and noise in measurement data.
- Published
- 2023
- Full Text
- View/download PDF
50. Assessment of condylar position in asymptomatic individuals before and after neuromuscular deprogramming with a stabilization splint
- Author
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Demirović Kenan, Demirović Elma, Džemidžić Vildana, and Nakas Enita
- Subjects
centric relation ,maximum intercuspation ,stabilization splint ,condylar displacement ,Medicine - Abstract
Introduction/Objective. Deprogramming of the neuromuscular system with the use of stabilization splint might provide more precise evaluation of the centric relation (CR) – maximum intercuspation (MI) discrepancy. The study aimed to evaluate the differences between the bite registrations obtained in the CR before and after the application of the stabilization splint therapy. Methods. The sample included 48 non-deprogrammed individuals without any apparent signs and symptoms of temporomandibular disorders (TMDs). The neuromuscular system was deprogrammed by employing stabilization splint therapy. A condylar displacement evaluation was performed on vertical, horizontal, and transverse planes of space, with the assistance of a condylar position indicator. Results. The mean values of condylar displacements, which were obtained after the deprogramming of the neuromuscular system, were significantly greater than those obtained before neuromuscular deprogramming for vertical condylar displacement (p < 0.0001). A greater degree of condylar distraction was observed on the left side of the vertical plane before (p < 0.01) and after neuromuscular deprogramming (p < 0.05). The highest level of condylar displacement occurred in the postero-inferior direction subsequent to the muscle deprogramming. Conclusion. It was observed that the level of average condylar displacements was significantly higher following the deprogramming of the neuromuscular system compared to that recorded before neuromuscular deprogramming using stabilization splint therapy. A more precise orthodontic diagnosis could have been obtained if the condyles were placed in a more exact CR position by muscle deprogramming.
- Published
- 2023
- Full Text
- View/download PDF
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