49,347 results on '"Angelini, A"'
Search Results
152. InterView: A System to Support Interaction-Driven Visualization Systems Design.
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Matteo Filosa, Alexandra Plexousaki, Dario Benvenuti, Tiziana Catarci, and Marco Angelini
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- 2024
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153. BenchIMP: A Benchmark for Quantitative Evaluation of the Incident Management Process Assessment.
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Alessandro Palma, Nicola Bartoloni, and Marco Angelini
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- 2024
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154. It is Time To Steer: A Scalable Framework for Analysis-Driven Attack Graph Generation
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Palma, Alessandro, Angelini, Marco, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Garcia-Alfaro, Joaquin, editor, Kozik, Rafał, editor, Choraś, Michał, editor, and Katsikas, Sokratis, editor
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- 2024
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155. Fair Volatility in the Fractional Stochastic Regularity Model
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Bianchi, Sergio, Angelini, Daniele, Frezza, Massimiliano, Palazzo, Anna Maria, Pianese, Augusto, Corazza, Marco, editor, Gannon, Frédéric, editor, Legros, Florence, editor, Pizzi, Claudio, editor, and Touzé, Vincent, editor
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- 2024
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156. Joint Use of Geomatic and Geophysical Methods for the Survey and Documentation of the Vespasian’s Thermal Baths (Cittaducale, Rieti, Italy)
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Angelini, Andrea, Cozzolino, Marilena, Foschi, Barbara, Gabrielli, Roberto, Gentile, Vincenzo, Mauriello, Paolo, Scopinaro, Eleonora, Goos, Gerhard, Series Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Gervasi, Osvaldo, editor, Murgante, Beniamino, editor, Garau, Chiara, editor, Taniar, David, editor, C. Rocha, Ana Maria A., editor, and Faginas Lago, Maria Noelia, editor
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- 2024
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157. InterView: A System to Support Interaction-Driven Visualization Systems Design
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Filosa, Matteo, Plexousaki, Alexandra, Benvenuti, Dario, Catarci, Tiziana, Angelini, Marco, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Goos, Gerhard, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Lárusdóttir, Marta Kristín, editor, Naqvi, Bilal, editor, Bernhaupt, Regina, editor, Ardito, Carmelo, editor, and Sauer, Stefan, editor
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- 2024
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158. The WebCrow French Crossword Solver
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Angelini, Giovanni, Ernandes, Marco, Iaquinta, Tommaso, Stehlé, Caroline, Simões, Fanny, Zeinalipour, Kamyar, Zugarini, Andrea, Gori, Marco, Akan, Ozgur, Editorial Board Member, Bellavista, Paolo, Editorial Board Member, Cao, Jiannong, Editorial Board Member, Coulson, Geoffrey, Editorial Board Member, Dressler, Falko, Editorial Board Member, Ferrari, Domenico, Editorial Board Member, Gerla, Mario, Editorial Board Member, Kobayashi, Hisashi, Editorial Board Member, Palazzo, Sergio, Editorial Board Member, Sahni, Sartaj, Editorial Board Member, Shen, Xuemin, Editorial Board Member, Stan, Mircea, Editorial Board Member, Jia, Xiaohua, Editorial Board Member, Zomaya, Albert Y., Editorial Board Member, Clayton, Martin, editor, Passacantando, Mauro, editor, and Sanguineti, Marcello, editor
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- 2024
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159. The Neil Gehrels Swift Observatory
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Angelini, Lorella, Cenko, S. Bradley, Kennea, Jamie A., Siegel, Michael H., Barthelmy, Scott D., Parmar, Arvind, Section editor, Santangelo, Andrea, Section editor, Nan Zhang, Shuang, Section editor, Bambi, Cosimo, editor, and Santangelo, Andrea, editor
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- 2024
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160. Gut Microbiota and Obesity
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Angelini, Giulia, Russo, Sara, Mingrone, Geltrude, Lenzi, Andrea, Series Editor, Jannini, Emmanuele A., Series Editor, Federici, Massimo, editor, and Menghini, Rossella, editor
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- 2024
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161. Design and Development of New Wearable and Protective Equipment for Human Spaceflights
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Pellegrini, Maurizio, Coviello, Giuseppe, Brunetti, Giuseppe, Angelini, Francesco, Lagravinese, Ilario, Manca, Giorgia, Gentile, Flavio Augusto, Vittori, Roberto, Ciminelli, Caterina, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, Bellotti, Francesco, editor, Grammatikakis, Miltos D., editor, Mansour, Ali, editor, Ruo Roch, Massimo, editor, Seepold, Ralf, editor, Solanas, Agusti, editor, and Berta, Riccardo, editor
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- 2024
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162. Loss of DNA repair mechanisms in cardiac myocytes induce dilated cardiomyopathy.
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Henpita, Chathurika, Vyas, Rajesh, Healy, Chastity, Kieu, Tra, Gurkar, Aditi, Yousefzadeh, Matthew, Cui, Yuxiang, Lu, Aiping, Angelini, Luise, OKelly, Ryan, McGowan, Sara, Chandrasekhar, Sanjay, Vanderpool, Rebecca, Hennessy-Wack, Danielle, Ross, Mark, Bachman, Timothy, McTiernan, Charles, Pillai, Smitha, Ladiges, Warren, Lavasani, Mitra, Huard, Johnny, Beer-Stolz, Donna, St Croix, Claudette, Watkins, Simon, Robbins, Paul, Mora, Ana, Kelley, Eric, Wang, Yinsheng, OConnell, Timothy, and Niedernhofer, Laura
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cardiomyopathy ,congestive heart failure ,genotoxic stress ,oxidative stress ,Mice ,Animals ,Myocytes ,Cardiac ,Cardiomyopathy ,Dilated ,Tumor Suppressor Protein p53 ,Myocardium ,DNA Repair - Abstract
Cardiomyopathy is a progressive disease of the myocardium leading to impaired contractility. Genotoxic cancer therapies are known to be potent drivers of cardiomyopathy, whereas causes of spontaneous disease remain unclear. To test the hypothesis that endogenous genotoxic stress contributes to cardiomyopathy, we deleted the DNA repair gene Ercc1 specifically in striated muscle using a floxed allele of Ercc1 and mice expressing Cre under control of the muscle-specific creatinine kinase (Ckmm) promoter or depleted systemically (Ercc1-/D mice). Ckmm-Cre+/- ;Ercc1-/fl mice expired suddenly of heart disease by 7 months of age. As young adults, the hearts of Ckmm-Cre+/- ;Ercc1-/fl mice were structurally and functionally normal, but by 6-months-of-age, there was significant ventricular dilation, wall thinning, interstitial fibrosis, and systolic dysfunction indicative of dilated cardiomyopathy. Cardiac tissue from the tissue-specific or systemic model showed increased apoptosis and cardiac myocytes from Ckmm-Cre+/- ;Ercc1-/fl mice were hypersensitive to genotoxins, resulting in apoptosis. p53 levels and target gene expression, including several antioxidants, were increased in cardiac tissue from Ckmm-Cre+/- ;Ercc1-/fl and Ercc1-/D mice. Despite this, cardiac tissue from older mutant mice showed evidence of increased oxidative stress. Genetic or pharmacologic inhibition of p53 attenuated apoptosis and improved disease markers. Similarly, overexpression of mitochondrial-targeted catalase improved disease markers. Together, these data support the conclusion that DNA damage produced endogenously can drive cardiac disease and does so mechanistically via chronic activation of p53 and increased oxidative stress, driving cardiac myocyte apoptosis, dilated cardiomyopathy, and sudden death.
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- 2023
163. Clinical and Neurophysiologic Phenotypes in Neonates With BRAT1 Encephalopathy
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Carapancea, Evelina, Cornet, Marie-Coralie, Milh, Mathieu, De Cosmo, Lucrezia, Huang, Eric J, Granata, Tiziana, Striano, Pasquale, Ceulemans, Berten, Stein, Anja, Morris-Rosendahl, Deborah, Conti, Greta, Mitra, Nipa, Raymond, F Lucy, Rowitch, David H, Solazzi, Roberta, Vercellino, Fabiana, De Liso, Paola, D'Onofrio, Gianluca, Boniver, Clementina, Danhaive, Olivier, Carkeek, Katherine, Salpietro, Vincenzo, Weckhuysen, Sarah, Fedrigo, Marny, Angelini, Annalisa, Castellotti, Barbara, Lederer, Damien, Benoit, Valerie, Raviglione, Federico, Guerrini, Renzo, Dilena, Robertino, and Cilio, Maria Roberta
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Paediatrics ,Biomedical and Clinical Sciences ,Neurosciences ,Perinatal Period - Conditions Originating in Perinatal Period ,Pediatric ,Clinical Research ,Brain Disorders ,Neurodegenerative ,Infant Mortality ,Neurological ,Humans ,Myoclonus ,Apnea ,Hyperekplexia ,Bradycardia ,Brain Diseases ,Seizures ,Phenotype ,Muscle Hypertonia ,Nuclear Proteins ,Clinical Sciences ,Cognitive Sciences ,Neurology & Neurosurgery ,Clinical sciences - Abstract
Background and objectivesBRAT1 encephalopathy is an ultra-rare autosomal recessive neonatal encephalopathy. We delineate the neonatal electroclinical phenotype at presentation and provide insights for early diagnosis.MethodsThrough a multinational collaborative, we studied a cohort of neonates with encephalopathy associated with biallelic pathogenic variants in BRAT1 for whom detailed clinical, neurophysiologic, and neuroimaging information was available from the onset of symptoms. Neuropathologic changes were also analyzed.ResultsWe included 19 neonates. Most neonates were born at term (16/19) from nonconsanguineous parents. 15/19 (79%) were admitted soon after birth to a neonatal intensive care unit, exhibiting multifocal myoclonus, both spontaneous and exacerbated by stimulation. 7/19 (37%) had arthrogryposis at birth, and all except 1 progressively developed hypertonia in the first week of life. Multifocal myoclonus, which was present in all but 1 infant, was the most prominent manifestation and did not show any EEG correlate in 16/19 (84%). Video-EEG at onset was unremarkable in 14/19 (74%) infants, and 6 (33%) had initially been misdiagnosed with hyperekplexia. Multifocal seizures were observed at a median age of 14 days (range: 1-29). During the first months of life, all infants developed progressive encephalopathy, acquired microcephaly, prolonged bouts of apnea, and bradycardia, leading to cardiac arrest and death at a median age of 3.5 months (range: 20 days to 30 months). Only 7 infants (37%) received a definite diagnosis before death, at a median age of 34 days (range: 25-126), and almost two-thirds (12/19, 63%) were diagnosed 8 days to 12 years postmortem (median: 6.5 years). Neuropathology examination, performed in 3 patients, revealed severely delayed myelination and diffuse astrogliosis, sparing the upper cortical layers.DiscussionBRAT1 encephalopathy is a neonatal-onset, rapidly progressive neurologic disorder. Neonates are often misdiagnosed as having hyperekplexia, and many die undiagnosed. The key phenotypic features are multifocal myoclonus, an organized EEG, progressive, persistent, and diffuse hypertonia, and an evolution into refractory multifocal seizures, prolonged bouts of apnea, bradycardia, and early death. Early recognition of BRAT1 encephalopathy allows for prompt workup, appropriate management, and genetic counseling.
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- 2023
164. An identification and testing strategy for proxy-SVARs with weak proxies
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Angelini, Giovanni, Cavaliere, Giuseppe, and Fanelli, Luca
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Economics - Econometrics - Abstract
When proxies (external instruments) used to identify target structural shocks are weak, inference in proxy-SVARs (SVAR-IVs) is nonstandard and the construction of asymptotically valid confidence sets for the impulse responses of interest requires weak-instrument robust methods. In the presence of multiple target shocks, test inversion techniques require extra restrictions on the proxy-SVAR parameters other those implied by the proxies that may be difficult to interpret and test. We show that frequentist asymptotic inference in these situations can be conducted through Minimum Distance estimation and standard asymptotic methods if the proxy-SVAR can be identified by using `strong' instruments for the non-target shocks; i.e. the shocks which are not of primary interest in the analysis. The suggested identification strategy hinges on a novel pre-test for the null of instrument relevance based on bootstrap resampling which is not subject to pre-testing issues, in the sense that the validity of post-test asymptotic inferences is not affected by the outcomes of the test. The test is robust to conditionally heteroskedasticity and/or zero-censored proxies, is computationally straightforward and applicable regardless of the number of shocks being instrumented. Some illustrative examples show the empirical usefulness of the suggested identification and testing strategy.
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- 2022
165. Molecular origin of the two-step mechanism of gellan aggregation
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Tavagnacco, Letizia, Chiessi, Ester, Severini, Leonardo, Franco, Silvia, Buratti, Elena, Capocefalo, Angela, Brasili, Francesco, Conte, Adriano Mosca, Missori, Mauro, Angelini, Roberta, Sennato, Simona, Mazzuca, Claudia, and Zaccarelli, Emanuela
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Condensed Matter - Soft Condensed Matter - Abstract
Among hydrocolloids, gellan is one of the most used anionic polysaccharides, because of its capability of forming mechanically stable gels at relatively low concentrations. Despite its long-standing use and importance, the gellan aggregation mechanism is still not presently understood at the microscopic level due to the lack of atomistic information. Here we will fill this gap by reporting molecular dynamics simulations of gellan chains at different polymer and salt contents, being able to unveil the occurrence of the two steps in the process, in agreement with existing hypotheses. At first, the formation of double helices takes place, followed by the aggregation into super-structures. For both steps, the role of bivalent cations appears to be crucial, as also shown by rheology and atomic force microscopy measurements: they not only facilitate the junction of the chains into double helices, but also promote through bridging their arrangement into larger aggregates. On the other hand, monovalent cations have a much more reduced role, making it possible to form double helices only at very high salt content and not actively participating in the formation of gels. Our simulations thus offer the first complete microscopic overview of gellan aggregation and will be important for future use of gellan-based systems for a wide variety of applications, ranging from food science to art restoration.
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- 2022
166. Proceedings of the 30th International Symposium on Graph Drawing and Network Visualization (GD 2022)
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Angelini, Patrizio and von Hanxleden, Reinhard
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Computer Science - Computational Geometry ,Computer Science - Discrete Mathematics ,Computer Science - Data Structures and Algorithms ,Computer Science - Human-Computer Interaction ,Mathematics - Combinatorics - Abstract
This is the arXiv index for the electronic proceedings of GD 2022, which is held at the Tokyo Institute of Technology, Tokyo, Japan, on September 13 - 16, 2022. It contains the peer-reviewed and revised accepted papers with an optional appendix. Proceedings (without appendices) are also to be published by Springer in the Lecture Notes in Computer Science series.
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- 2022
167. Top-predator recovery abates geomorphic decline of a coastal ecosystem
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Hughes, Brent B., Beheshti, Kathryn M., Tinker, M. Tim, Angelini, Christine, Endris, Charlie, Murai, Lee, Anderson, Sean C., Espinosa, Sarah, Staedler, Michelle, Tomoleoni, Joseph A., Sanchez, Madeline, and Silliman, Brian R.
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- 2024
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168. Recognizing Map Graphs of Bounded Treewidth
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Angelini, Patrizio, Bekos, Michael A., Da Lozzo, Giordano, Gronemann, Martin, Montecchiani, Fabrizio, and Tappini, Alessandra
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- 2024
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169. Biological inoculants and chemical fertilizers application produce differential effects on rhizobacterial community structure associated to peanut (Arachis hypogaea L.) and maize (Zea mays L.) plants
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Anzuay, María Soledad, Viso, Natalia Pin, Ludueña, Liliana Mercedes, Morla, Federico Daniel, Dalmasso, Romina Yanet, Angelini, Jorge Guillermo, and Taurian, Tania
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- 2024
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170. Facial emotion expressivity in patients with Parkinson’s and Alzheimer’s disease
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Cannavacciuolo, Antonio, Paparella, Giulia, Salzillo, Martina, Colella, Donato, Canevelli, Marco, Costa, Davide, Birreci, Daniele, Angelini, Luca, Guerra, Andrea, Ricciardi, Lucia, Bruno, Giuseppe, Berardelli, Alfredo, and Bologna, Matteo
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- 2024
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171. Invasive consumers provoke ecosystem-wide disruption of salt marsh functions by dismantling a keystone mutualism
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Fischman, Hallie S., Smyth, Ashley R., and Angelini, Christine
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- 2024
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172. The role of laboratory investigations in the classification of tremors
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Angelini, Luca, Terranova, Roberta, Lazzeri, Giulia, van den Berg, Kevin R E, Dirkx, Michiel F, and Paparella, Giulia
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- 2023
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173. Human parietal epithelial cells (PECs) and proteinuria in lupus nephritis: a role for ClC-5, megalin, and cubilin?
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Ceol, Monica, Gianesello, Lisa, Trimarchi, Hernan, Migliorini, Alberto, Priante, Giovanna, Radu, Claudia M., Naso, Elena, Angelini, Annalisa, Calò, Lorenzo A., Anglani, Franca, and Del Prete, Dorella
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- 2023
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174. You can’t export that! Export ban for modern and contemporary Italian art
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Angelini, Francesco, Castellani, Massimiliano, and Pattitoni, Pierpaolo
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- 2023
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175. Effective connectivity of functional brain regions through concurrent intracerebral electrical stimulation and frequency-tagged visual presentation
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Luna Angelini, Angélique Volfart, Corentin Jacques, Sophie Colnat-Coulbois, Louis Maillard, Bruno Rossion, and Jacques Jonas
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Direct electrical stimulation ,Fusiform face area ,Effective connectivity ,Frequency-tagging ,Human face recognition ,StereoElectroEncephalography ,Neurosciences. Biological psychiatry. Neuropsychiatry ,RC321-571 - Published
- 2024
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176. Requirements Engineering for Integrated Social Assistance Distribution Information Systems Using a Microservices Architecture Approach
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Siski Angelini and Dwi Hosanna Bangkalang
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Technology ,Information technology ,T58.5-58.64 - Abstract
Distribution of social aid on target is important to help the welfare of people in need. In Bugel Subdistrict, Salatiga, this distribution has several problems, namely, data discrepancies, the application process is not transparent, and there is no distribution monitoring, resulting in social assistance recipients not being on target and affecting decisions on providing assistance for the next period. Therefore, a social assistance distribution information system is needed to assist in managing integrated data collection and monitoring distribution and application status. The information system requirements engineering method uses the system engineering life cycle method developed by Alexander Kossiakoff with a focus on the concept development stage. This research aims to identify the initial needs for a data management information system for social assistance recipients by producing a distribution of coordinate points as well as new distribution and submission monitoring features using a microservices architecture approach and visualizing with a design display using mobile first design technology referring to a responsive mobile display, containing detailed information, images , location routes to improve the performance of social assistance administrators with real-time data access
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- 2024
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177. Stochastic Gradient Descent-like relaxation is equivalent to Metropolis dynamics in discrete optimization and inference problems
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Maria Chiara Angelini, Angelo Giorgio Cavaliere, Raffaele Marino, and Federico Ricci-Tersenghi
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Medicine ,Science - Abstract
Abstract Is Stochastic Gradient Descent (SGD) substantially different from Metropolis Monte Carlo dynamics? This is a fundamental question at the time of understanding the most used training algorithm in the field of Machine Learning, but it received no answer until now. Here we show that in discrete optimization and inference problems, the dynamics of an SGD-like algorithm resemble very closely that of Metropolis Monte Carlo with a properly chosen temperature, which depends on the mini-batch size. This quantitative matching holds both at equilibrium and in the out-of-equilibrium regime, despite the two algorithms having fundamental differences (e.g. SGD does not satisfy detailed balance). Such equivalence allows us to use results about performances and limits of Monte Carlo algorithms to optimize the mini-batch size in the SGD-like algorithm and make it efficient at recovering the signal in hard inference problems.
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- 2024
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178. Modern treatment of unicameral and aneurysmatic bone cysts
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Elisa Pala, Giulia Trovarelli, Andrea Angelini, Maria Chiara Cerchiaro, and Pietro Ruggieri
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unicameral bone cyst ,aneurismatic bone cyst ,Orthopedic surgery ,RD701-811 - Abstract
The best treatment of unicameral bone cyst and aneurismatic bone cyst (ABC) is debated in the literature. For simple bone cysts, multiple treatments were proposed from observation only to open curettage. The historical treatment with intraosseous injection of methylprednisolone acetate into the bone cysts nowadays is reduced due to the morbidity of multiple injections and the risk of multiple pathologic fractures until the healing. Different types of treatments for ABC are reported, including surgery, percutaneous treatments, and medical treatments; however, there is currently no consensus on the best approach. The association of curettage, bone graft, and elastic stable intramedullary nail (ESIN) had a success rate of over 85%. Decompressing the cyst wall is more critical for increasing the healing rate than the type of graft used to fill the cavity. In ABC, sclerotherapy offers the advantages of lower invasiveness and morbidity, associated with better functional scores and faster return to full weight-bearing. Moreover, they can be used in challenging locations. Selective arterial embolization is a complex procedure and often requires association with other treatments. Further studies are needed to confirm the effectiveness of denosumab and its side effects on skeletally immature patients. Curettage with adjuvants and autogenous bone grafting still shows promising results and can be used in larger, aggressive defects or superficial lesions. For simple bone cysts, the combination of curettage, bone graft, and ESIN showed the best results. Sclerotherapy for ABC also shows promising results.
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- 2024
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179. Shoreline Extraction Methods from Sentinel-2 and PlanetScope Images
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R. Angelini, E. Angelats, G. Luzi, F. Ribas, and A. Masiero
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Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Applied optics. Photonics ,TA1501-1820 - Abstract
This work aims to compare and assess the performance of certain methodologies for shoreline mapping based on the use of medium (10 m) and high resolution (3 m) multi-spectral imagery, provided by Sentinel-2 (S2) and PlanetScope (PS), respectively. Being Sentinel-2 part of the Copernicus missions, its data are freely available. PS imagery are also freely available for scientific research, upon approval by the European Space Agency of a related project proposal. Several spectral indices, including Normalized Difference Water Index (NDWI), Modified Normalized Difference Water Index (MNDWI), Automated Water Extraction Index (AWEI), and Water Index (WI), were used for shoreline detection. In particular, two unsupervised classification techniques, the Gaussian Mixture Model (GMM) and K-means clustering were deployed as shoreline extraction methods. The outcomes of such approaches were validated using reference shorelines derived from aerial orthomosaics, generated from images acquired as close as possible to the satellite imagery dates, and the ”baseline and transect” approach for accuracy verification. Three tide-less Mediterranean beaches were used as study cases for comparison: the beach between Castelldefels and Gava in Spain, Feniglia and Marina di Grosseto in Italy. The results demonstrated sub-pixel accuracy in shoreline extraction, with Mean Absolute Distances ranging from 2 m to 5 m for S2 data and 1.5 m to 2 m for PS data. These findings highlight the potential of freely available satellite data for semi-automatic shoreline detection. Results obtained by using the combination of different indices and methodologies show that the best option may change depending on the considered context, hence future investigations should be dedicated to the development of a procedure for automatically determining the context-based (close to) optimal index-classifier combination.
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- 2024
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180. Cardiac function is regulated by the sodium-dependent inhibition of the sodium-calcium exchanger NCX1
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Kyle Scranton, Scott John, Marina Angelini, Federica Steccanella, Soban Umar, Rui Zhang, Joshua I. Goldhaber, Riccardo Olcese, and Michela Ottolia
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Science - Abstract
Abstract The Na+-Ca2+ exchanger (NCX1) is the dominant Ca2+ extrusion mechanism in cardiac myocytes. NCX1 activity is inhibited by intracellular Na+ via a process known as Na+-dependent inactivation. A central question is whether this inactivation plays a physiological role in heart function. Using CRISPR/Cas9, we inserted the K229Q mutation in the gene (Slc8a1) encoding for NCX1. This mutation removes the Na+-dependent inactivation while preserving transport properties and other allosteric regulations. NCX1 mRNA levels, protein expression, and protein localization are unchanged in K229Q male mice. However, they exhibit reduced left ventricular ejection fraction and fractional shortening, while displaying a prolonged QT interval. K229Q ventricular myocytes show enhanced NCX1 activity, resulting in action potential prolongation, higher incidence of aberrant action potentials, a faster decline of Ca2+ transients, and depressed cell shortening. The results demonstrate that NCX1 Na+-dependent inactivation plays an essential role in heart function by affecting both cardiac excitability and contractility.
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- 2024
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181. Effects of Coping Strategies on Health-Related Quality of Life of People with Neuromuscular Diseases
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Irune García, Alicia Aurora Rodríguez, Corrado Angelini, Maddalen García-Sanchoyerto, Patricia Espinosa-Blanco, and Oscar Martínez
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neuromuscular diseases ,rare diseases ,coping strategies ,health-related quality of life ,disability ,clinical practice ,Physiology ,QP1-981 ,Diseases of the musculoskeletal system ,RC925-935 - Abstract
Neuromuscular diseases (NMD) cover a broad spectrum of different rare diagnoses in which the primary lesion is in the peripheral nervous system. The impairment caused by an NMD does not only interfere with physical status but also has a clear impact on health-related quality of life (HRQoL). It is therefore essential to know the coping style used by these patients. This study aims to analyze the coping strategies in a sample of people with NMD and how their coping style affects their HRQoL. This cross-sectional study included 61 adult patients diagnosed with a rare NMD. WHO-DAS II, SIP, SF-36, and COPE-60 instruments were administered. The results showed that people affected by NMDs tend to use more frequent coping strategies such as active planning, personal growth, and acceptance. In contrast, the least-used strategies were restraint, mental disengagement, venting, humor, and religion, which affected HRQoL negatively. Moreover, the degree of disability was a relevant variable, with an impact on HRQoL. Social support can be considered the main coping strategy that leads to an improvement in the psychosocial HRQoL (β = 503, p < 0.001). These findings are relevant to clinical practice, given the need to understand the coping variable to improve HRQoL.
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- 2024
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182. Multipolar Analysis in Symmetrical Meta-Atoms Sustaining Fano Resonances
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Vittorio Bonino and Angelo Angelini
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all-dielectric metasurfaces ,Mie resonances ,Kerker condition ,Optics. Light ,QC350-467 ,Applied optics. Photonics ,TA1501-1820 - Abstract
We present an optical metasurface with symmetrical individual elements sustaining Fano resonances with high Q-factors. This study combines plane-wave illumination and modal analysis to investigate the resonant behavior that results in a suppression of the forward scattering, and we investigate the role of the lattice constant on the excited multipoles and on the spectral position and Q-factor of the Fano resonances, revealing the nonlocal nature of the resonances. The results show that the intrinsic losses play a crucial role in modulating the resonance amplitude in specific conditions and that the optical behavior of the device is extremely sensitive to the pitch of the metasurface. The findings highlight the importance of near-neighbor interactions to achieve high Q resonances and offer an important tool for the design of spectrally tunable metasurfaces using simple geometries.
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- 2024
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183. The Evaluation and Management of Lung Metastases in Patients with Giant Cell Tumors of Bone in the Denosumab Era
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Giulia Trovarelli, Arianna Rizzo, Mariachiara Cerchiaro, Elisa Pala, Andrea Angelini, and Pietro Ruggieri
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lung metastases ,giant cell tumor ,bone ,treatment ,oncologic outcomes ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Giant cell tumor of bone (GCTB) is characterized by uncertain biological behavior due to its local aggressiveness and metastasizing potential. In this study, we conducted a meta-analysis of the contemporary literature to evaluate all management strategies for GCTB metastases. A combination of the terms “lung metastases”, “giant cell tumor”, “bone”, “treatment”, and “oncologic outcomes” returned 133 patients meeting our inclusion criteria: 64 males and 69 females, with a median age of 28 years (7–63), at the onset of primary GCTB. Lung metastases typically occur at a mean interval of 26 months (range: 0–143 months) after treatment of the primary site, commonly presenting as multiple and bilateral lesions. Various treatment approaches, including surgery, chemotherapy, radiotherapy, and drug administration, were employed, while 35 patients underwent routine monitoring only. Upon a mean follow-up of about 7 years (range: 1–32 years), 90% of patients were found to be alive, while 10% had died. Death occurred in 25% of patients who had chemotherapy, whereas 96% of those not treated or treated with Denosumab alone were alive at a mean follow-up of 6 years (range: 1–19 years). Given the typically favorable prognosis of lung metastases in patients with GCTB, additional interventions beyond a histological diagnosis confirmation may not be needed. Denosumab, by reducing the progression of the disease, can play a pivotal role in averting or delaying lung failure.
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- 2024
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184. Trait emotional intelligence and ecological outcomes: the role of connectedness to nature
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Vanessa Marchetti, Angelo Panno, Massimiliano Scopelliti, Luciano Romano, Giacomo Angelini, Elena Rinallo, Daniela Barni, and Caterina Fiorilli
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Climate change ,Connectedness to nature ,Love and care for nature ,Pro-environmental behaviors ,Trait emotional intelligence ,Psychology ,BF1-990 - Abstract
Abstract Background Global climate change is recognized as a major and irreversible challenge for humanity, requiring people’s responsible and sustainable behaviors toward the environment. So far, the literature has widely investigated the role of cognitive determinants of ecological outcomes (e.g., pro-environmental behaviors and climate change perception), while less attention has been devoted to emotional processes, such as trait emotional intelligence (TEI). The current double study investigates whether TEI is directly and indirectly associated with climate change perception (CCP, Study 1) and pro-environmental behaviors (PEBs, Study 2) among young adults. Furthermore, the mediating role of connectedness to nature (CN), both as cognitive and emotional factors, was also analyzed. We hypothesized that CN (i.e., cognitive mediator) would positively mediate the relationship between TEI and CCP (H1), and Love and Care for Nature (LCN, i.e., emotional mediator) would positively mediate the relationship between TEI and PEBs (H2). Methods The study involved 342 young adults (F = 60.7%; age 19–40; Mage=22.99; SD = 2.66) in Study 1 and 365 young adults (F = 71.2%; age 17–35; Mage=22.2; SD = 3.98) in Study 2. Data were collected through an online tool shared by the snowball method. We administered the following self-reports: Trait Emotional Intelligence Questionnaire- Short Form (TEIQue- SF), Global Climate Change (GCC), and Connectedness to Nature Scale (CNS) (Study 1); Trait Emotional Intelligence Questionnaire- Short Form (TEIQue-SF), General Environmental Behaviors Scale (GEB), and Love and Care for Nature (LCN) (Study 2). Results Findings from Study 1 showed that higher TEI levels enhance CN (i.e., cognitive mediator), positively influencing CCP (estimate = 0.14; 95% CI = 0.07 to 0.23). Findings from Study 2 showed that higher TEI levels are associated with higher LCN levels (i.e., emotional mediator), influencing people’s engagement in PEBs (estimate = 0.7; 95% CI = 0.03 to 0.11). Conclusion It is crucial to design environmental education programs that promote greater emotional intelligence ability and encourage individuals’ involvement in ecological outcomes.
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- 2024
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185. Nanofabrication Process Scale-Up via Displacement Talbot Lithography of a Plasmonic Metasurface for Sensing Applications
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Paola Pellacani, Konstantins Jefimovs, Margherita Angelini, Franco Marabelli, Valentina Tolardo, Dimitrios Kazazis, and Francesco Floris
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plasmonic metasurface ,lithographic techniques ,optical (bio)sensing ,Optics. Light ,QC350-467 ,Applied optics. Photonics ,TA1501-1820 - Abstract
The selection of an affordable method to fabricate plasmonic metasurfaces needs to guarantee complex control over both tunability and reproducibility of their spectral and morphological properties, making plasmonic metasurfaces suitable for integration into different sensing devices. Displacement Talbot lithography could be a valid solution thanks to the limited fabrication steps required, also providing the highly desired industrial scalability. Fabricated plasmonic metasurfaces are represented by a gold nanohole array on a glass substrate based on a triangular pattern. Scanning electron microscopy measurements have been recorded, showing the consistency of the surface features with the optimized design parameters. Reflectance and transmittance measurements have also been carried out to test the reliability and standardization of the metasurface’s optical response. Furthermore, these plasmonic metasurfaces have also been successfully tested for probing refractive index variations in a microfluidic system, paving the way for their use in sensitive, real-time, label-free, and multiplexing detection of bio-molecular events.
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- 2024
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186. Angle-Resolved Optical Characterization of a Plasmonic Triangular Array of Elliptical Holes in a Gold Layer
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Margherita Angelini, Konstantins Jefimovs, Paola Pellacani, Dimitrios Kazazis, Franco Marabelli, and Francesco Floris
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plasmonics ,gold nanohole arrays ,optical characterization ,elliptical symmetry ,Optics. Light ,QC350-467 ,Applied optics. Photonics ,TA1501-1820 - Abstract
Plasmonic arrays are grating-like structures able to couple an incoming electromagnetic field into either localized or propagating surface plasmonic modes. A triangular array of elliptical holes in a gold layer were realized resorting to displacement Talbot lithography. Scanning electron microscopy was used to evaluate the geometrical features and finite time domain simulations were performed to verify the consistency of the design. The optical response was characterized by angle-resolved reflectance and transmittance measurements. The results demonstrate the good quality and uniformity of the array. Furthermore, the study on the dependence of the optical response on both the hexagonal lattice and the elliptical hole-defined symmetry properties was conducted allowing the distinction of their effects on both the localized and propagating plasmonic modes. The results indicate that the localized component of the plasmonic modes is mainly affected by the elliptical shape, while the propagating part is influenced by the hexagonal lattice symmetry.
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- 2024
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187. Renal biopsies from donors with acute kidney injury show different molecular patterns according to the post-transplant function
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Flavia Neri, Maria Letizia Lo Faro, Maria Kaisar, Ka Ho Tam, Martyna Borak, Jan Lindeman, Annalisa Angelini, Marny Fedrigo, Jesper Kers, James Hunter, and Rutger Ploeg
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Medicine ,Science - Abstract
Abstract The utilization of kidneys from donors with acute kidney injury (AKI) is often limited by unpredictable post-transplantation outcomes. The aim of our study was to identify protein mediators implicated in either recovery or failure of these organs. Forty kidney biopsies from donors with (20) and without AKI (20) were selected and then subdivided according to the post-transplant outcome defined as a threshold of 45 ml/min for the eGFR at 1 year from transplantation. Tissue homogenates were analysed by western blot to assess how the levels of 17 pre-selected proteins varied across the four groups. Samples from AKI kidneys with a poor outcome showed a fourfold increase in the levels of PPARg and twofold reduction of STAT1 compared to the other groups (p
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- 2024
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188. Endothelial gene regulatory elements associated with cardiopharyngeal lineage differentiation
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Ilaria Aurigemma, Olga Lanzetta, Andrea Cirino, Sara Allegretti, Gabriella Lania, Rosa Ferrentino, Varsha Poondi Krishnan, Claudia Angelini, Elizabeth Illingworth, and Antonio Baldini
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Biology (General) ,QH301-705.5 - Abstract
Abstract Endothelial cells (EC) differentiate from multiple sources, including the cardiopharyngeal mesoderm, which gives rise also to cardiac and branchiomeric muscles. The enhancers activated during endothelial differentiation within the cardiopharyngeal mesoderm are not completely known. Here, we use a cardiogenic mesoderm differentiation model that activates an endothelial transcription program to identify endothelial regulatory elements activated in early cardiogenic mesoderm. Integrating chromatin remodeling and gene expression data with available single-cell RNA-seq data from mouse embryos, we identify 101 putative regulatory elements of EC genes. We then apply a machine-learning strategy, trained on validated enhancers, to predict enhancers. Using this computational assay, we determine that 50% of these sequences are likely enhancers, some of which are already reported. We also identify a smaller set of regulatory elements of well-known EC genes and validate them using genetic and epigenetic perturbation. Finally, we integrate multiple data sources and computational tools to search for transcriptional factor binding motifs. In conclusion, we show EC regulatory sequences with a high likelihood to be enhancers, and we validate a subset of them using computational and cell culture models. Motif analyses show that the core EC transcription factors GATA/ETS/FOS is a likely driver of EC regulation in cardiopharyngeal mesoderm.
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- 2024
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189. Identification of therapeutic targets in osteoarthritis by combining heterogeneous transcriptional datasets, drug-induced expression profiles, and known drug-target interactions
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Maria Claudia Costa, Claudia Angelini, Monica Franzese, Concetta Iside, Marco Salvatore, Luigi Laezza, Francesco Napolitano, and Michele Ceccarelli
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OA ,Cartilage ,Consensus signature ,Network ,Risk score ,Drug prediction ,Medicine - Abstract
Abstract Background Osteoarthritis (OA) is a multifactorial, hypertrophic, and degenerative condition involving the whole joint and affecting a high percentage of middle-aged people. It is due to a combination of factors, although the pivotal mechanisms underlying the disease are still obscure. Moreover, current treatments are still poorly effective, and patients experience a painful and degenerative disease course. Methods We used an integrative approach that led us to extract a consensus signature from a meta-analysis of three different OA cohorts. We performed a network-based drug prioritization to detect the most relevant drugs targeting these genes and validated in vitro the most promising candidates. We also proposed a risk score based on a minimal set of genes to predict the OA clinical stage from RNA-Seq data. Results We derived a consensus signature of 44 genes that we validated on an independent dataset. Using network analysis, we identified Resveratrol, Tenoxicam, Benzbromarone, Pirinixic Acid, and Mesalazine as putative drugs of interest for therapeutics in OA for anti-inflammatory properties. We also derived a list of seven gene-targets validated with functional RT-qPCR assays, confirming the in silico predictions. Finally, we identified a predictive subset of genes composed of DNER, TNFSF11, THBS3, LOXL3, TSPAN2, DYSF, ASPN and HTRA1 to compute the patient’s risk score. We validated this risk score on an independent dataset with a high AUC (0.875) and compared it with the same approach computed using the entire consensus signature (AUC 0.922). Conclusions The consensus signature highlights crucial mechanisms for disease progression. Moreover, these genes were associated with several candidate drugs that could represent potential innovative therapeutics. Furthermore, the patient’s risk scores can be used in clinical settings.
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- 2024
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190. Improving the Latin America and Caribbean Soil Information System (SISLAC) database enhances its usability and scalability
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S. Díaz-Guadarrama, V. M. Varón-Ramírez, I. Lizarazo, M. Guevara, M. Angelini, G. A. Araujo-Carrillo, J. Argeñal, D. Armas, R. A. Balta, A. Bolivar, N. Bustamante, R. O. Dart, M. Dell Acqua, A. Encina, H. Figueredo, F. Fontes, J. S. Gutiérrez-Díaz, W. Jiménez, R. S. Lavado, J. F. Mansilla-Baca, M. de Lourdes Mendonça-Santos, L. M. Moretti, I. D. Muñoz, C. Olivera, G. Olmedo, C. Omuto, S. Ortiz, C. Pascale, M. Pfeiffer, I. A. Ramos, D. Ríos, R. Rivera, L. M. Rodriguez, D. M. Rodríguez, A. Rosales, K. Rosales, G. Schulz, V. Sevilla, L. M. Tenti, R. Vargas, G. M. Vasques, Y. Yigini, and Y. Rubiano
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Environmental sciences ,GE1-350 ,Geology ,QE1-996.5 - Abstract
Spatial soil databases can help model complex phenomena in which soils are a decisive factor – for example, evaluating agricultural potential or estimating carbon storage capacity. The Latin America and Caribbean Soil Information System, SISLAC, is a regional initiative promoted by the Food and Agriculture Organization's (FAO) Latin America and the Caribbean Soil Partnership to contribute to sustainable management of soil. SISLAC includes data from 49 084 soil profiles distributed unevenly across the continent, making it the region's largest soil database. In addition, there are other soil databases in the region with about 40 000 soil profiles that can be integrated into SISLAC and improve it. However, some problems hinder its usages, such as the quality of the data and their high dimensionality. The objective of this research is evaluate the quality of the SISLAC data and the other available soil databases to generate a new improved version that meets the minimum quality requirements to be used for different purposes or practical applications. The results show that 15 % of the existing soil profiles had an inaccurate description of the diagnostic horizons and 17 % of the additional profiles already existed in SISLAC; therefore, a total of 32 % of profiles were excluded for these two reasons. Further correction of an additional 4.5 % of existing inconsistencies improved overall data quality. The improved database consists of 66 746 profiles and is available for public use at https://doi.org/10.5281/zenodo.7876731 (Díaz-Guadarrama and Guevara, 2023). This revised version of SISLAC data offers the opportunity to generate information that helps decision-making on issues in which soils are a decisive factor. It can also be used to plan future soil surveys in areas with low density or where updated information is required.
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- 2024
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191. Evaluating a targeted person-centred pain management intervention programme in lumbar spine surgery - a controlled segment-specific before-and-after interventional design
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Eva Angelini, Axel Wolf, Helle Wijk, Helena Brisby, and Adad Baranto
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Person-centred care ,Postoperative pain management ,Co-creation ,Shared decision-making ,Patient satisfaction ,Spine surgery ,Public aspects of medicine ,RA1-1270 - Abstract
Abstract Background Postoperative pain management in lumbar spine surgery care remains a challenge. The aim of this study was to evaluate the impact of a person-centred postoperative pain management intervention programme on lumbar spine surgery patients on postoperative pain, shared decision-making, and satisfaction with postoperative pain management. Methods The study was performed with a controlled before-and-after interventional design in an orthopaedic unit at a university hospital. Person-centred pain management for patients undergoing spine surgery was developed in co-creation by a multi-professional team and implemented throughout the care pathway. The usual care group (pre-intervention) served as a comparison to the intervention group. Pain intensity, shared decision-making in pain management, and patient satisfaction with results of pain management, served as patient-reported measures, collected using the International Pain Outcomes questionnaire and analysed using descriptive statistics. Results The intervention showed no benefit for patients’ pain and satisfaction, while shared decision-making in pain management was significant lower in the intervention group than in the conventional group. The per-protocol analysis showed no significant differences between groups. Conclusion The initial assumption of the study, that the implementation of a co-created structured person-centred care pathway would improve patient-reported outcomes, was not confirmed. The periodically low fidelity to the intervention due to organizational constraints (due to sub-optimal organizational conditions and managerial support) may have affected the results.
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- 2024
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192. Time-Varying Poisson Autoregression
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Angelini, Giovanni, Cavaliere, Giuseppe, D'Innocenzo, Enzo, and De Angelis, Luca
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Economics - Econometrics ,Statistics - Methodology - Abstract
In this paper we propose a new time-varying econometric model, called Time-Varying Poisson AutoRegressive with eXogenous covariates (TV-PARX), suited to model and forecast time series of counts. {We show that the score-driven framework is particularly suitable to recover the evolution of time-varying parameters and provides the required flexibility to model and forecast time series of counts characterized by convoluted nonlinear dynamics and structural breaks.} We study the asymptotic properties of the TV-PARX model and prove that, under mild conditions, maximum likelihood estimation (MLE) yields strongly consistent and asymptotically normal parameter estimates. Finite-sample performance and forecasting accuracy are evaluated through Monte Carlo simulations. The empirical usefulness of the time-varying specification of the proposed TV-PARX model is shown by analyzing the number of new daily COVID-19 infections in Italy and the number of corporate defaults in the US.
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- 2022
193. The Ising spin glass on random graphs at zero temperature: not all spins are glassy in the glassy phase
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Perrupato, Gianmarco, Angelini, Maria Chiara, Parisi, Giorgio, Ricci-Tersenghi, Federico, and Rizzo, Tommaso
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Condensed Matter - Disordered Systems and Neural Networks ,Condensed Matter - Statistical Mechanics ,Mathematical Physics - Abstract
We investigate the replica symmetry broken (RSB) phase of spin glass (SG) models in a random field defined on Bethe lattices at zero temperature. From the properties of the RSB solution we deduce a closed equation for the extreme values of the cavity fields. This equation turns out not to depend on the parameters defining the RSB, and it predicts that the spontaneous RSB does not take place homogeneously on the whole system. Indeed, there exist spins having the same effective local field in all local ground states, exactly as in the replica symmetric (RS) phase, while the spontaneous RSB manifests only on the remaining spins, whose fraction vanishes at criticality. The characterization in terms of spins having fixed or fluctuating local fields can be extended also to the random field Ising model (RFIM), in which case the fluctuating spins are the only responsible for the spontaneous magnetization in the ferromagnetic phase. Close to criticality we are able to connect the statistics of the local fields acting on the spins in the RSB phase with the correlation functions measured in the paramagnetic phase. Identifying the two types of spins on given instances of SG and RFIM, we show that they participate very differently to avalanches produced by flipping a single spin. From the scaling of the number of spins inducing RSB effects close to the critical point and using the $M$-layer expansion we estimate the upper critical dimension $D_U \geq 8$ for SG., Comment: 8 pages, 6 figures
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- 2022
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194. A Methodology to Support Automatic Cyber Risk Assessment Review
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Angelini, Marco, Bonomi, Silvia, and Palma, Alessandro
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Computer Science - Cryptography and Security - Abstract
Cyber risk assessment is a fundamental activity for enhancing the protection of an organization, identifying and evaluating the exposure to cyber threats. Currently, this activity is carried out mainly manually and the identification and correct quantification of risks deeply depend on the experience and confidence of the human assessor. As a consequence, the process is not completely objective and two parallel assessments of the same situation may lead to different results. This paper takes a step in the direction of reducing the degree of subjectivity by proposing a methodology to support risk assessors with an automatic review of the produced assessment. Our methodology starts from a controls-based assessment performed using well-known cybersecurity frameworks (e.g., ISO 27001, NIST) and maps security controls over infrastructural aspects that can be assessed automatically (e.g., ICT devices, organization policies). Exploiting this mapping, the methodology suggests how to identify controls needing revision. The approach has been validated through a case study from the healthcare domain and a set of statistical analyses., Comment: 16 pages, 5 figures
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- 2022
195. Unify and Conquer: How Phonetic Feature Representation Affects Polyglot Text-To-Speech (TTS)
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Sanchez, Ariadna, Falai, Alessio, Zhang, Ziyao, Angelini, Orazio, and Yanagisawa, Kayoko
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Electrical Engineering and Systems Science - Audio and Speech Processing ,Computer Science - Computation and Language - Abstract
An essential design decision for multilingual Neural Text-To-Speech (NTTS) systems is how to represent input linguistic features within the model. Looking at the wide variety of approaches in the literature, two main paradigms emerge, unified and separate representations. The former uses a shared set of phonetic tokens across languages, whereas the latter uses unique phonetic tokens for each language. In this paper, we conduct a comprehensive study comparing multilingual NTTS systems models trained with both representations. Our results reveal that the unified approach consistently achieves better cross-lingual synthesis with respect to both naturalness and accent. Separate representations tend to have an order of magnitude more tokens than unified ones, which may affect model capacity. For this reason, we carry out an ablation study to understand the interaction of the representation type with the size of the token embedding. We find that the difference between the two paradigms only emerges above a certain threshold embedding size. This study provides strong evidence that unified representations should be the preferred paradigm when building multilingual NTTS systems.
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- 2022
196. Mix and Match: An Empirical Study on Training Corpus Composition for Polyglot Text-To-Speech (TTS)
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Zhang, Ziyao, Falai, Alessio, Sanchez, Ariadna, Angelini, Orazio, and Yanagisawa, Kayoko
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Electrical Engineering and Systems Science - Audio and Speech Processing ,Computer Science - Computation and Language ,Computer Science - Machine Learning - Abstract
Training multilingual Neural Text-To-Speech (NTTS) models using only monolingual corpora has emerged as a popular way for building voice cloning based Polyglot NTTS systems. In order to train these models, it is essential to understand how the composition of the training corpora affects the quality of multilingual speech synthesis. In this context, it is common to hear questions such as "Would including more Spanish data help my Italian synthesis, given the closeness of both languages?". Unfortunately, we found existing literature on the topic lacking in completeness in this regard. In the present work, we conduct an extensive ablation study aimed at understanding how various factors of the training corpora, such as language family affiliation, gender composition, and the number of speakers, contribute to the quality of Polyglot synthesis. Our findings include the observation that female speaker data are preferred in most scenarios, and that it is not always beneficial to have more speakers from the target language variant in the training corpus. The findings herein are informative for the process of data procurement and corpora building., Comment: Accepted to be published in the Proceedings of InterSpeech 2022
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- 2022
197. RAC Drawings of Graphs with Low Degree
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Angelini, Patrizio, Bekos, Michael A., Katheder, Julia, Kaufmann, Michael, and Pfister, Maximilian
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Computer Science - Computational Geometry ,Computer Science - Discrete Mathematics ,Computer Science - Data Structures and Algorithms - Abstract
Motivated by cognitive experiments providing evidence that large crossing-angles do not impair the readability of a graph drawing, RAC (Right Angle Crossing) drawings were introduced to address the problem of producing readable representations of non-planar graphs by supporting the optimal case in which all crossings form 90{\deg} angles. In this work, we make progress on the problem of finding RAC drawings of graphs of low degree. In this context, a long-standing open question asks whether all degree-3 graphs admit straight-line RAC drawings. This question has been positively answered for the Hamiltonian degree-3 graphs. We improve on this result by extending to the class of 3-edge-colorable degree-3 graphs. When each edge is allowed to have one bend, we prove that degree-4 graphs admit such RAC drawings, a result which was previously known only for degree-3 graphs. Finally, we show that 7-edge-colorable degree-7 graphs admit RAC drawings with two bends per edge. This improves over the previous result on degree-6 graphs., Comment: Extended version of a paper presented at MFCS 2022
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- 2022
198. Recognizing Map Graphs of Bounded Treewidth
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Angelini, Patrizio, Bekos, Michael A., Da Lozzo, Giordano, Gronemann, Martin, Montecchiani, Fabrizio, and Tappini, Alessandra
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Computer Science - Data Structures and Algorithms - Abstract
A map graph is a graph admitting a representation in which vertices are nations on a spherical map and edges are shared curve segments or points between nations. We present an explicit fixed-parameter tractable algorithm for recognizing map graphs parameterized by treewidth. The algorithm has time complexity that is linear in the size of the graph and, if the input is a yes-instance, it reports a certificate in the form of a so-called witness. Furthermore, this result is developed within a more general algorithmic framework that allows to test, for any $k$, if the input graph admits a $k$-map (where at most $k$ nations meet at a common point) or a hole-free~$k$-map (where each point of the sphere is covered by at least one nation). We point out that, although bounding the treewidth of the input graph also bounds the size of its largest clique, the latter alone does not seem to be a strong enough structural limitation to obtain an efficient time complexity. In fact, while the largest clique in a $k$-map graph is $\lfloor 3k/2 \rfloor$, the recognition of $k$-map graphs is still open for any fixed $k \ge 5$.
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- 2022
199. Modern graph neural networks do worse than classical greedy algorithms in solving combinatorial optimization problems like maximum independent set
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Angelini, Maria Chiara and Ricci-Tersenghi, Federico
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Computer Science - Machine Learning ,Condensed Matter - Disordered Systems and Neural Networks ,Computer Science - Artificial Intelligence ,Mathematics - Optimization and Control - Abstract
The recent work ``Combinatorial Optimization with Physics-Inspired Graph Neural Networks'' [Nat Mach Intell 4 (2022) 367] introduces a physics-inspired unsupervised Graph Neural Network (GNN) to solve combinatorial optimization problems on sparse graphs. To test the performances of these GNNs, the authors of the work show numerical results for two fundamental problems: maximum cut and maximum independent set (MIS). They conclude that "the graph neural network optimizer performs on par or outperforms existing solvers, with the ability to scale beyond the state of the art to problems with millions of variables." In this comment, we show that a simple greedy algorithm, running in almost linear time, can find solutions for the MIS problem of much better quality than the GNN. The greedy algorithm is faster by a factor of $10^4$ with respect to the GNN for problems with a million variables. We do not see any good reason for solving the MIS with these GNN, as well as for using a sledgehammer to crack nuts. In general, many claims of superiority of neural networks in solving combinatorial problems are at risk of being not solid enough, since we lack standard benchmarks based on really hard problems. We propose one of such hard benchmarks, and we hope to see future neural network optimizers tested on these problems before any claim of superiority is made., Comment: Comment to "Combinatorial Optimization with Physics-Inspired Graph Neural Networks'' [Nat Mach Intell 4 (2022) 367] https://www.nature.com/articles/s42256-022-00468-6
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- 2022
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200. Halting hyaluronidase activity with hyaluronan-based nanohydrogels: development of versatile injectable formulations
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Montanari, E., Zoratto, N., Mosca, L., Cervoni, L., Lallana, E., Angelini, R., Matassa, R., Coviello, T., Di Meo, C., and Matricardi, P.
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Condensed Matter - Soft Condensed Matter - Abstract
Hyaluronan (HA) is among the most used biopolymers for viscosupplementation and cosmetic applications. However, the current injectable HA-based formulations present relevant limitations: I) unmodified HA is quickly degraded by endogenous hyaluronidases (HAase), resulting in short lasting properties; II) cross-linked HA, although shows enhanced stability against HAase, often contains toxic chemical cross-linkers. As such, herein, we present biocompatible self-assembled hyaluronan-cholesterol nanohydrogels (HA-CH NHs) able to bind to HAase and inhibit the enzyme activity in vitro, more efficiently than currently marketed HA-based cross-linked formulations (e.g. JonexaTM). HA-CH NHs inhibit HAase through a mixed mechanism, by which NHs bind to HAase with an affinity constant 7-fold higher than that of HA. Similar NHs, based on gellan-cholesterol, evidenced no binding to HAase, neither inhibition of the enzyme activity, suggesting this effect might be due to the specific binding of HA-CH to the active site of the enzyme. Therefore, HA-CH NHs were engineered into injectable hybrid HA mixtures or physical hydrogels, able to halt the enzymatic degradation of HA., Comment: 27 pages, 9 figures
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- 2022
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