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Search Results: 1 - 10 of 7460 matches for " Francesco Ricciardi "
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Multiple vortices for a self-dual CP(1) Maxwell-Chern-Simons model
Francesco Chiacchio,Tonia Ricciardi
Mathematics , 2003,
Abstract: We prove the existence of at least two doubly periodic vortex solutions for a self-dual CP(1) Maxwell-Chern-Simons model. To this end we analyze a system of two elliptic equations with exponential nonlinearities. Such a system is shown to be equivalent to a fourth-order elliptic equation admitting a variational structure.
Some sharp Hardy inequalities on spherically symmetric domains
Francesco Chiacchio,Tonia Ricciardi
Mathematics , 2008,
Abstract: We prove some sharp Hardy inequalities for domains with a spherical symmetry. In particular, we prove an inequality for domains of the unit $n$-dimensional sphere with a point singularity, and an inequality for functions defined on the half-space $\R_+^{n+1}$} vanishing on the hyperplane $\{x_{n+1}=0\}$, with singularity along the $x_{n+1}$-axis. The proofs rely on a one-dimensional Hardy inequality involving a weight function related to the volume element on the sphere, as well as on symmetrization arguments. The one-dimensional inequality is derived in a general form.
N-Acetyltransferase 2 status and gastric cancer risk: a preliminary meta-analysis
Stefania Boccia,Giuseppe La Torre,Francesco Gianfagna,Gualtiero Ricciardi
Italian Journal of Public Health , 2005, DOI: 10.2427/5998
Abstract: In recent studies N- Acetyltransferase 2 (NAT2) genotype has been considered as a risk factor for developing gastric cancer, however with conflicting results among Asian and Caucasian populations. In order to clarify the influence of NAT2 slow acetylation status on gastric cancer risk, a preliminary meta-analysis of published case-control studies was undertaken. The primary outcome measure was the odds ratio (OR) for the risk of gastric cancer associated with the NAT2 slow genotype using a random effects model. Pooling the results from the 5 studies identified (771 cases, 1083 controls), an overall OR for gastric cancer risk associated with the NAT2 slow genotype of 0.91 emerged (95% CI: 0.54-1.55). The result suggests that the NAT2 slow genotype has probably no effect on the risk of gastric cancer. Additional epidemiological studies, based on sample sizes that are commensurate with the detection of small genotypic risks, are required to confirm these findings. Future studies may also help to clarify whether geographic differences exist.
Impairment of the Bacterial Biofilm Stability by Triclosan
Helen V. Lubarsky, Sabine U. Gerbersdorf, Cédric Hubas, Sebastian Behrens, Francesco Ricciardi, David M. Paterson
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0031183
Abstract: The accumulation of the widely-used antibacterial and antifungal compound triclosan (TCS) in freshwaters raises concerns about the impact of this harmful chemical on the biofilms that are the dominant life style of microorganisms in aquatic systems. However, investigations to-date rarely go beyond effects at the cellular, physiological or morphological level. The present paper focuses on bacterial biofilms addressing the possible chemical impairment of their functionality, while also examining their substratum stabilization potential as one example of an important ecosystem service. The development of a bacterial assemblage of natural composition – isolated from sediments of the Eden Estuary (Scotland, UK) – on non-cohesive glass beads (<63 μm) and exposed to a range of triclosan concentrations (control, 2 – 100 μg L?1) was monitored over time by Magnetic Particle Induction (MagPI). In parallel, bacterial cell numbers, division rate, community composition (DGGE) and EPS (extracellular polymeric substances: carbohydrates and proteins) secretion were determined. While the triclosan exposure did not prevent bacterial settlement, biofilm development was increasingly inhibited by increasing TCS levels. The surface binding capacity (MagPI) of the assemblages was positively correlated to the microbial secreted EPS matrix. The EPS concentrations and composition (quantity and quality) were closely linked to bacterial growth, which was affected by enhanced TCS exposure. Furthermore, TCS induced significant changes in bacterial community composition as well as a significant decrease in bacterial diversity. The impairment of the stabilization potential of bacterial biofilm under even low, environmentally relevant TCS levels is of concern since the resistance of sediments to erosive forces has large implications for the dynamics of sediments and associated pollutant dispersal. In addition, the surface adhesive capacity of the biofilm acts as a sensitive measure of ecosystem effects.
Functional Characterization of Bifidobacteria of Human Origin: A Case Study by the Students of Food Science and Technology of the University of Foggia (Southern Italy)  [PDF]
Emanuela Ciuffreda, Angino Veronica, Antonietta Cifelli, Rossana Foti, Rosaria Ilenia Forte, Fabio Graziani, Andrea Giuseppe Longo, Angela Longo, Valeria Maglia, Emilio Francesco Ricciardi, Alessandra Sabatino, Annamaria Tomaiuolo, Maria Rosaria Corbo, Milena Sinigaglia, Antonio Bevilacqua
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.513125
Abstract: The aim of this paper was to study the potential technological and probiotic properties of bifidobacteria isolated from human feces. Bifidobacteria, naturally present in the dominant colonic microbiota, represent up to 25% of the cultivable faecal bacteria in adults and 80% in infants. Bifidobacteria have been shown to adhere and colonize in high numbers different types of cultured intestinal epithelial cells; moreover some authors reported that some strains are able to stabilize the intestinal microbiota during and after antibiotic therapy, modulate the immune system, protecting against chemically induced intestinal inflammation and reducing symptoms of colitis. Eight isolates of bifidobacteria were studied to assess their technological and probiotic traits; the technological characterization relied on the assessment of enzymatic activities (proteolytic and lipolytic activity), growth under various conditions (pH, temperature and addition of salt), acidifying ability and metabolism (arginine deamination, esculin, esculin hydrolysis and citrate metabolism). The study of the probiotic characteristics focused on the evaluation of the survival at low pH and with bile salts added, antibiotic resistance, and hydrophobic properties. As a result of this process, two promising strains were selected for further studies.
Comparison of Epithelial Differentiation and Immune Regulatory Properties of Mesenchymal Stromal Cells Derived from Human Lung and Bone Marrow
Mario Ricciardi, Giorgio Malpeli, Francesco Bifari, Giulio Bassi, Luciano Pacelli, Armel Hervé Nwabo Kamdje, Marco Chilosi, Mauro Krampera
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0035639
Abstract: Mesenchymal stromal cells (MSCs) reside in many organs including lung, as shown by their isolation from fetal lung tissues, bronchial stromal compartment, bronchial-alveolar lavage and transplanted lung tissues. It is still controversial whether lung MSCs can undergo mesenchymal-to-epithelial-transition (MET) and possess immune regulatory properties. To this aim, we isolated, expanded and characterized MSCs from normal adult human lung (lung-hMSCs) and compared with human bone marrow-derived MSCs (BM-hMSCs). Our results show that lung-MSCs reside at the perivascular level and do not significantly differ from BM-hMSCs in terms of immunophenotype, stemness gene profile, mesodermal differentiation potential and modulation of T, B and NK cells. However, lung-hMSCs express higher basal level of the stemness-related marker nestin and show, following in vitro treatment with retinoic acid, higher epithelial cell polarization, which is anyway partial when compared to a control epithelial bronchial cell line. Although these results question the real capability of acquiring epithelial functions by MSCs and the feasibility of MSC-based therapeutic approaches to regenerate damaged lung tissues, the characterization of this lung-hMSC population may be useful to study the involvement of stromal cell compartment in lung diseases in which MET plays a role, such as in chronic obstructive pulmonary disease and idiopathic pulmonary fibrosis.
Semileptonic B decays
Ricciardi, Giulia
High Energy Physics - Phenomenology , 2013,
Abstract: We review recent progress in exclusive B --> D^(*) and inclusive B --> X(u) semileptonic B decays
Des relations plus humaines ?
Ferruccio Ricciardi
SociologieS , 2012,
Abstract: à partir d’une approche sociohistorique, cet article s’intéresse aux effets de la croissance économique sur l’identité des cadres, en l’occurrence les groupements de cadres et patrons italiens qui, au lendemain de la Seconde Guerre mondiale, essaient de conjuguer les principes du catholicisme social dont ils se réclament dans l’arène publique avec les logiques issues du productivisme managérial américain qui s’impose en Europe occidentale. Le prisme des méthodes de relations humaines pour la gestion des salariés est ici utilisé pour rendre compte des modes de construction d’une identité professionnelle prise entre l’ esprit du religieux et l’ esprit du capitalisme . La déclinaison des relations humaines en fonction du projet de justice sociale préconisé par la doctrine sociale de l’église en ressort amendée, car elles sont per ues moins comme un levier pour l’intégration des salariés que comme un instrument au service du contr le politique de ceux-ci. Are the relations more human? Catholic executives and the employers facing the managerial productivism (Italy, ‘50s-‘60s)This article deals with the effects of economic growth on the identity of managers and the employers, especially the Italian ones who, after the World War II, try to combine their catholic principles with the issues of the managerial productivism spreading in the Western Europe. Adopting a socio-historical framework, the article analyses the implementation of the human relations techniques for the management of personnel in order to grasp a split professional identity between the ‘spirit of religious’ and the ‘spirit of capitalism’. The declination of the human relations theories according to the principles of social justice advocated by the social doctrine of the Church has been amended, because of the perception of the human relations as a means for political control of workers rather than an opportunity for their integration in the capitalistic society. Relaciones más humanas? Ejecutivos y empresarios cristianos frente el productivismo empresarial (Italia, a os 1950-1960)A partir de un enfoque histórico-social, este artículo se interesa por los efectos del crecimiento económico en la identidad de los ejecutivos, particularmente en las agrupaciones de ejecutivos y empresarios italianos que, después de la Segunda Guerra Mundial intentan compaginar los principios del catolicismo social con las lógicas sacadas del productivismo empresarial americano que se impone en la Europa occidental del momento. El estudio de los métodos de relaciones humanas para la gestión de los t
L’ecologia umana tra sistemi naturali e sistemi sociali
Claudio Ricciardi
Antrocom : Online Journal of Anthropology , 2008,
Abstract: I rischi ambientali che la salute umana si trova oggi ad affrontare si manifestano sempre più in una indistinguibile separazione dai sistemi sociali. Una visione scientista e riduttiva che relegava l’umano ad un esclusivo materiale organico ha sempre sottratto ad esso ogni significato sociale, culturale e politico. Il passaggio dauna suscettibilità genetica ristretta per alcuni ad una vulnerabilità generalizzata per tutti porta a considerazioni etiche sostanziali. La tutela della salute di noi esseri umani passa inevitabilmente attraverso la tutela dell’ambiente che per le sue qualità e condizioni deve consentire a tale vulnerabilità e dipendenza di poter continuare ad esistere.
La dissolvenza dell'individuale. Luhmann e la semantica storico-sociale
Maurizio Ricciardi
Scienza & Politica : per una Storia delle Dottrine , 2009, DOI: 10.6092/issn.1825-9618/2740
Abstract: La dissolvenza dell’individuale. Luhmann e la semantica storico-sociale
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