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319 results on '"Posteraro P"'

4. Prognostic value of serial (1,3)-β-d-glucan measurements in ICU patients with invasive candidiasis

Author

Carelli, Simone, Posteraro, Brunella, Torelli, Riccardo, De Carolis, Elena, Vallecoccia, Maria Sole, Xhemalaj, Rikardo, Cutuli, Salvatore Lucio, Tanzarella, Eloisa Sofia, Dell’Anna, Antonio Maria, Lombardi, Gianmarco, Cammarota, Fabiola, Caroli, Alessandro, Grieco, Domenico Luca, Sanguinetti, Maurizio, Antonelli, Massimo, and De Pascale, Gennaro

Published
2024
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8. Isoperimetric sets for weighted twisted eigenvalues

Author

Brandolini, Barbara, Henrot, Antoine, Mercaldo, Anna, and Posteraro, Maria Rosaria

Subjects
Mathematics - Analysis of PDEs, Mathematics - Spectral Theory
Abstract

In tis paper we prove an isoperimetric inequality for the first twisted eigenvalue $\lambda_{1,\gamma}^T(\Omega)$ of a weighted operator, defined as the minimum of the usual Rayleigh quotient when the trial functions belong to the weighted Sobolev space $H_0^1(\Omega,d\gamma)$ and have weighted mean value equal to zero in $\Omega$. We are interested in positive measures $d\gamma=\gamma(x) dx$ for which we are able to identify the isoperimetric sets, namely, the sets that minimize $\lambda_{1,\gamma}^T(\Omega)$ among sets of given weighted measure. In the cases under consideration, the optimal sets are given by two identical and disjoint copies of the isoperimetric sets (for the weighted perimeter with respect to the weighted measure).

Published
2023

10. Incidence of bloodstream infections due to multidrug-resistant pathogens in ordinary wards and intensive care units before and during the COVID-19 pandemic: a real-life, retrospective observational study

Author

Segala, Francesco Vladimiro, Pafundi, Pia Clara, Masciocchi, Carlotta, Fiori, Barbara, Taddei, Eleonora, Antenucci, Laura, De Angelis, Giulia, Guerriero, Silvia, Pastorino, Roberta, Damiani, Andrea, Posteraro, Brunella, Sanguinetti, Maurizio, De Pascale, Gennaro, Fantoni, Massimo, and Murri, Rita

Published
2023
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11. Sobolev Anisotropic inequalities with monomial weights

Author

Feo, Filomena, Martín, Joaquim, and Posteraro, MRosaria

Subjects
Mathematics - Functional Analysis, 46E30, 26D10
Abstract

We derive some anisotropic Sobolev inequalities in $\mathbb{R}^{n}$ with a monomial weight in the general setting of rearrangement invariant spaces. Our starting point is to obtain an integral oscillation inequality in multiplicative form.

Published
2019

12. Some isoperimetric inequalities with respect to monomial weights

Author

Alvino, Angelo, Brock, Friedemann, Chiacchio, Francesco, Mercaldo, Anna, and Posteraro, Maria Rosaria

Subjects
Mathematics - Analysis of PDEs, 51M16, 46E35, 46E30, 35P15
Abstract

We solve a class of isoperimetric problems on $\mathbb{R}^2_+ :=\left\{ (x,y)\in \mathbb{R} ^2 : y>0 \right\}$ with respect to monomial weights. Let $\alpha $ and $\beta $ be real numbers such that $0\le \alpha <\beta+1$, $\beta\le 2 \alpha$. We show that, among all smooth sets $\Omega$ in $\mathbb{R} ^2_+$ with fixed weighted measure $\iint_{\Omega } y^{\beta} dxdy$, the weighted perimeter $\int_{\partial \Omega } y^\alpha \, ds$ achieves its minimum for a smooth set which is symmetric w.r.t. to the $y$--axis, and is explicitly given. Our results also imply an estimate of a weighted Cheeger constant and a lower bound for the first eigenvalue of a class of nonlinear problems.

Published
2019

14. The isoperimetric problem for a class of non-radial weights and applications

Author

Alvino, Angelo, Brock, Friedemann, Chiacchio, Francesco, Mercaldo, Anna, and Posteraro, Maria Rosaria

Subjects
Mathematics - Analysis of PDEs, 51M16, 46E35, 46E30, 35P15
Abstract

We study a class of isoperimetric problems on $\mathbb{R}^{N}_{+} $ where the densities of the weighted volume and weighted perimeter are given by two different non-radial functions of the type $|x|^k x_N^\alpha$. Our results imply some sharp functional inequalities, like for instance, Caffarelli-Kohn-Nirenberg type inequalities., Comment: arXiv admin note: text overlap with arXiv:1606.02195

Published
2018

15. On weighted isoperimetric inequalities with non-radial densities

Author

Alvino, Angelo, Brock, Friedemann, Chiacchio, Francesco, Mercaldo, Anna, and Posteraro, Maria Rosaria

Subjects
Mathematics - Analysis of PDEs, 51M16, 46E35, 46E30, 35P15
Abstract

We consider a class of isoperimetric problems on $\mathbb{R}^{N}_{+} $ where the volume and the area element carry two different weights of the type $|x|^lx_N^\alpha$. We solve them in a special case while a more detailed study is contained in \cite{ABCMP2}. Our results imply a weighted Polya-Sz\"ego principle and a priori estimates for weak solutions to a class of boundary value problems for degenerate elliptic equations

Published
2018

16. Some isoperimetric inequalities on $\mathbb{R} ^N$ with respect to weights $|x|^\alpha $

Author

Alvino, A., Brock, F., Chiacchio, F., Mercaldo, A., and Posteraro, M. R.

Subjects
Mathematics - Functional Analysis, 51M16, 46E35, 46E30, 35P15
Abstract

We solve a class of isoperimetric problems on $\mathbb{R}^N $ with respect to weights that are powers of the distance to the origin. For instance we show that if $k\in [0,1]$, then among all smooth sets $\Omega$ in $\mathbb{R} ^N$ with fixed Lebesgue measure, $\int_{\partial \Omega } |x|^k \, \mathscr{H}_{N-1} (dx)$ achieves its minimum for a ball centered at the origin. Our results also imply a weighted Polya-Sz\"ego principle. In turn, we establish radiality of optimizers in some Caffarelli-Kohn-Nirenberg inequalities, and we obtain sharp bounds for eigenvalues of some nonlinear problems.

Published
2016

17. Importance of Resolving Fungal Nomenclature: the Case of Multiple Pathogenic Species in the Cryptococcus Genus

Author

Hagen, Ferry, Lumbsch, H Thorsten, Arsenijevic, Valentina Arsic, Badali, Hamid, Bertout, Sebastien, Billmyre, R Blake, Bragulat, M Rosa, Cabañes, F Javier, Carbia, Mauricio, Chakrabarti, Arunaloke, Chaturvedi, Sudha, Chaturvedi, Vishnu, Chen, Min, Chowdhary, Anuradha, Colom, Maria-Francisca, Cornely, Oliver A, Crous, Pedro W, Cuétara, Maria S, Diaz, Mara R, Espinel-Ingroff, Ana, Fakhim, Hamed, Falk, Rama, Fang, Wenjie, Herkert, Patricia F, Rodríguez, Consuelo Ferrer, Fraser, James A, Gené, Josepa, Guarro, Josep, Idnurm, Alexander, Illnait-Zaragozi, María-Teresa, Khan, Ziauddin, Khayhan, Kantarawee, Kolecka, Anna, Kurtzman, Cletus P, Lagrou, Katrien, Liao, Wanqing, Linares, Carlos, Meis, Jacques F, Nielsen, Kirsten, Nyazika, Tinashe K, Pan, Weihua, Pekmezovic, Marina, Polacheck, Itzhack, Posteraro, Brunella, de Queiroz Telles, Flavio, Romeo, Orazio, Sánchez, Manuel, Sampaio, Ana, Sanguinetti, Maurizio, Sriburee, Pojana, Sugita, Takashi, Taj-Aldeen, Saad J, Takashima, Masako, Taylor, John W, Theelen, Bart, Tomazin, Rok, Verweij, Paul E, Wahyuningsih, Retno, Wang, Ping, and Boekhout, Teun

Subjects
Microbiology, Biological Sciences, Genetics, Infectious Diseases, 2.1 Biological and endogenous factors, Infection, Good Health and Well Being, Cryptococcus, cryptococcosis, diagnostics, species delimitation, taxonomy, Immunology
Abstract

Cryptococcosis is a major fungal disease caused by members of the Cryptococcus gattii and Cryptococcus neoformans species complexes. After more than 15 years of molecular genetic and phenotypic studies and much debate, a proposal for a taxonomic revision was made. The two varieties within C. neoformans were raised to species level, and the same was done for five genotypes within C. gattii. In a recent perspective (K. J. Kwon-Chung et al., mSphere 2:e00357-16, 2017, https://doi.org/10.1128/mSphere.00357-16), it was argued that this taxonomic proposal was premature and without consensus in the community. Although the authors of the perspective recognized the existence of genetic diversity, they preferred the use of the informal nomenclature "C. neoformans species complex" and "C. gattii species complex." Here we highlight the advantage of recognizing these seven species, as ignoring these species will impede deciphering further biologically and clinically relevant differences between them, which may in turn delay future clinical advances.

Published
2017

18. Reemergence of Streptococcus pyogenesInfections in a Large Italian Hospital: A déjà vu from past Years

Author

De Maio, Flavio, La Sorda, Marilena, Fiori, Barbara, Bianco, Delia Mercedes, Santarelli, Giulia, Rosato, Roberto, D’Inzeo, Tiziana, Posteraro, Brunella, and Sanguinetti, Maurizio

Abstract

At the end of 2022 and in the following months, an increase in the incidence of Streptococcus pyogenesinfections was observed in many European countries that was simultaneously accompanying to enhance of invasive infections (iGAS). We have showed a risen trend of S. pyogenesinfections among preschoolers after the pandemic event. A thorough epidemiological investigation of both paediatric and adult samples positive for S. pyogenesindicate a more complex scenario leading to need of important improvement in surveillance programs.

Published
2024
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19. Remark on the stability of Log-Sobolev inequality for Gaussian measure

Author

Feo, Filomena, Posteraro, Maria Rosaria, and Roberto, Cyril

Subjects
Mathematics - Functional Analysis
Abstract

In this note we bound the deficit in the logarithmic Sobolev Inequality and in the Talagrand transport-entropy Inequality for the Gaussian measure, in any dimension, by mean of a distance introduced by Bucur and Fragal\`a.

Published
2015

23. Quantitative isoperimetric inequalities for log-convex probability measures on the line

Author

Feo, F., Posteraro, M. R., and Roberto, C.

Subjects
Mathematics - Differential Geometry, Mathematics - Probability
Abstract

The purpose of this paper is to analyze the isoperimetric inequality for symmetric log-convex probability measures on the line. Using geometric arguments we first re-prove that extremal sets in the isoperimetric inequality are intervals or complement of intervals (a result due to Bobkov and Houdr\'e). Then we give a quantitative form of the isoperimetric inequality, leading to a somehow anomalous behavior. Indeed, it could be that a set is very close to be optimal, in the sense that the isoperimetric inequality is almost an equality, but at the same time is very far (in the sense of the symmetric difference between sets) to any extremal sets! From the results on sets we derive quantitative functional inequalities of weak Cheeger type.

Published
2014

27. Nonlinear machine learning pattern recognition and bacteria-metabolite multilayer network analysis of perturbed gastric microbiome

Author

Durán, Claudio, Ciucci, Sara, Palladini, Alessandra, Ijaz, Umer Z., Zippo, Antonio G., Sterbini, Francesco Paroni, Masucci, Luca, Cammarota, Giovanni, Ianiro, Gianluca, Spuul, Pirjo, Schroeder, Michael, Grill, Stephan W., Parsons, Bryony N., Pritchard, D. Mark, Posteraro, Brunella, Sanguinetti, Maurizio, Gasbarrini, Giovanni, Gasbarrini, Antonio, and Cannistraci, Carlo Vittorio

Published
2021
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29. Staphylococcus aureus ventilator-associated pneumonia in patients with COVID-19: clinical features and potential inference with lung dysbiosis

Author

De Pascale, Gennaro, De Maio, Flavio, Carelli, Simone, De Angelis, Giulia, Cacaci, Margherita, Montini, Luca, Bello, Giuseppe, Cutuli, Salvatore Lucio, Pintaudi, Gabriele, Tanzarella, Eloisa Sofia, Xhemalaj, Rikardo, Grieco, Domenico Luca, Tumbarello, Mario, Sanguinetti, Maurizio, Posteraro, Brunella, and Antonelli, Massimo

Published
2021
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30. On isoperimetric inequalities with respect to infinite measures

Author

Brock, F., Mercaldo, A., and Posteraro, M. R.

Subjects
Mathematics - Analysis of PDEs, 26D20, 35J70, 46E35
Abstract

We study isoperimetric problems with respect to infinite measures on $R ^n$. In the case of the measure $\mu$ defined by $d\mu = e^{c|x|^2} dx$, $c\geq 0$, we prove that, among all sets with given $\mu-$measure, the ball centered at the origin has the smallest (weighted) $\mu-$perimeter. Our results are then applied to obtain Polya-Szego-type inequalities, Sobolev embeddings theorems and a comparison result for elliptic boundary value problems., Comment: 25 pages

Published
2011

31. Logarithmic Sobolev Trace Inequalities

Author

Feo, F. and Posteraro, M. R.

Subjects
Mathematics - Functional Analysis
Abstract

We prove a logarithmic Sobolev trace inequality in a gaussian space and we study the trace operator in the weighted Sobolev space W^{1,p}(\Omega,\gamma) for sufficiently regular domain. We exhibit examples to show the sharpness of the results. Applications to PDE are also considered.

Published
2011

47. Combined use of serum (1,3)-β-d-glucan and procalcitonin for the early differential diagnosis between candidaemia and bacteraemia in intensive care units

Author

Giacobbe, Daniele Roberto, Mikulska, Malgorzata, Tumbarello, Mario, Furfaro, Elisa, Spadaro, Marzia, Losito, Angela Raffaella, Mesini, Alessio, De Pascale, Gennaro, Marchese, Anna, Bruzzone, Marco, Pelosi, Paolo, Mussap, Michele, Molin, Alexandre, Antonelli, Massimo, Posteraro, Brunella, Sanguinetti, Maurizio, Viscoli, Claudio, Del Bono, Valerio, and on behalf of ISGRI-SITA (Italian Study Group on Resistant Infections of the Società Italiana Terapia Antinfettiva)

Published
2017
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48. Setting-specific variability of false-positive result rates with rapid testing for SARS-CoV-2 antigen

Author

Posteraro, P., Errico, F. M., De Carolis, A., Menchinelli, Giulia, Sanguinetti, Maurizio, Posteraro, Brunella, Menchinelli G., Sanguinetti M. (ORCID:0000-0002-9780-7059), Posteraro B. (ORCID:0000-0002-1663-7546), Posteraro, P., Errico, F. M., De Carolis, A., Menchinelli, Giulia, Sanguinetti, Maurizio, Posteraro, Brunella, Menchinelli G., Sanguinetti M. (ORCID:0000-0002-9780-7059), and Posteraro B. (ORCID:0000-0002-1663-7546)

Abstract

Not available

Published
2022

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