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Search Results: 1 - 10 of 6080 matches for " Giovanni Ferraro "
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Infinite Volume Relaxation in the Sherrington-Kirkpatrick Model
Giovanni Ferraro
Physics , 1994,
Abstract: In a recent work (Eissfeller and Opper, 1992) a numerical method has been proposed to simulate off-equilibrium zero-temperature parallel dynamics for the SK model without finite size effects. We study the extension of the method to non-zero temperature and sequential dynamics, and analyze more carefully the involved computational problems. We find evidence, in the glassy phase, for an algebraic relaxation of the energy density to its equilibrium value, at least at large enough temperatures, and for an algebraic relaxation of the magnetization to zero at non-zero temperatures, with an exponent directly proportional to the temperature.
Subminimal Paths on a Stochastic Graph
Giovanni Ferraro
Physics , 1994,
Abstract: A simple model of a frustrated disordered system is presented. Apart from the (very different) physical interpretation, the model shares many features with that of Sherrington-Kirkpatrick for spin glasses, but, as a consequence of its relative simplicity, its ground state can be exactly determined by numerical methods. This fact allows us to test experimentally some theoretical predictions, based on a specialization of the ``cavity method'' developed for the SK model, which is presently limited to a ``non-frustrated'' approximation, corresponding to some extent to the replica-symmetric one for the SK model.
Composite fermions description of fractional topological insulators
Dario Ferraro,Giovanni Viola
Physics , 2011,
Abstract: We propose a $\mathbb{Z}_{2}$ classification of Abelian time-reversal fractional topological insulators in terms of the composite fermions picture. We consider the standard toy model where spin up and down electrons are subjected to opposite magnetic fields and only electrons of the same spin interact via a repulsive force. By applying the composite fermions approach to this time-reversal symmetric system, we are able to obtain a hierarchy of topological insulators with spin Hall conductance $\sigma_{s}=\frac{e}{2\pi}\frac{p}{2mp+1} $, being $p,m \in\mathbb{N}$. They show stable edge states only for odd $p$, as a direct consequence of the Kramer's theorem.
Biochemical Parameters Alterations in Multiple Sclerosis: A Longitudinal Study and Review of the Literature  [PDF]
Nicola Salvatore Orefice, Olga Ferraro, Francesco Barbato, Antonio Carotenuto, Roberta Lanzillo, Vincenzo Brescia Morra, Giovanni Coppola, Giuseppe Orefice
Pharmacology & Pharmacy (PP) , 2012, DOI: 10.4236/pp.2012.32033
Abstract: Multiple Sclerosis (MS) is a chronic inflammatory disease of the central nervous system (CNS) and is characterized by inflammation, demyelination and desctruction of oligodendrocytes and axons. The immunology of MS is complex, involving autoreactive Th1 and Th17 lymphocytes, cells of the innate immune system including dedritic, natural killer (NK) and microglia cells, as well as vascular endothelial cells. Multiple Sclerosis (MS) is based by a series of biochemical changes affecting to different extent neuronal functions; great attention has been focused on: liver enzymes, thyroid function tests, autoantibodies, lipid profile and uric acid levels. Following the introduction of therapy with drugs that modify the course of disease, more attention has been paid to the change of biochemical parameters, in particular to evaluate possible adverse effects. Aim of this study was to perform a review of the literature on biochemical alterations in treated and untreated MS patients and to assess laboratory parameters alterations in a cohort of MS patients, before and during treatment. On a total of 624 patients followed at our center, we selected those who practiced for the first time a therapy with IFN beta 1a at various doses, IFN beta 1b and Glatiramer acetate, that were 595 (95%), with baseline biochemical evaluation available in 488 (82%) (307 females, mean age 36.6 years). We considered the evolution of various biochemical parameters during treatment. The following outcome variables were evaluated: laboratory changes, in particular liver function, thyroid function, lipids and blood cell count. Percentages were compared using the chisquare test. ANOVA was performed to evaluate changes of laboratory tests over time between therapy groups. Our finding confirm the presence of biochemical alterations at baseline, in particular regarding liver enzymes, thyroid hormones and lipids. Treatment effects were more evident on liver enzymes elevation, anti thyroid antibodies production and blood cholesterol decrease. These effects were mainly transient and self remitting without suspension of therapy. Biochemical alterations, mainly related to autoimmune pathology and lipid metabolism change were encountered. Treatments increased transient biochemical alterations particulary in patients with baseline changes, suggesting a stricter monitoring of blood exams in this category of patients.
Low level exposure to cadmium increases the risk of chronic kidney disease: analysis of the NHANES 1999-2006
Pietro Ferraro, Stefano Costanzi, Alessandro Naticchia, Antonio Sturniolo, Giovanni Gambaro
BMC Public Health , 2010, DOI: 10.1186/1471-2458-10-304
Abstract: 5426 subjects ≥ 20 years were stratified for values of urinary and blood Cd and a multivariate logistic regression was performed to test the association between blood and urinary Cd, CKD and albuminuria (ALB) after adjustment for age, gender, race/ethnicity, body mass index and smoking habits.Subjects with urinary Cd > 1 mcg/g and subjects with blood Cd > 1 mcg/L showed a higher association with ALB (OR 1.63, 95% CI 1.23, 2.16; P = 0.001). Subjects with blood Cd > 1 mcg/L showed a higher association with both CKD (OR 1.48, 95% CI 1.01, 2.17; P = 0.046) and ALB (OR 1.41, 95% CI 1.10, 1.82; P = 0.007). An interaction effect on ALB was found for high levels of urinary and blood Cd (P = 0.014).Moderately high levels of urinary and blood Cd are associated with a higher proportion of CKD and ALB in the United States population.Chronic exposure to Cadmium (Cd), an industrial and environmental pollutant, can cause both renal proximal tubular damage and decline in glomerular filtration rate (GFR) in humans; this has been confirmed in experimental models [1,2]. After pulmonary and/or gastrointestinal absorption, Cd binds to serum albumin and accumulates in the liver, where it is complexed to a metal-binding protein with a high affinity for Cd, metallothionein-1 [3]. The Cd-metallothionein-1 complex reaches the kidney where it is filtered and accumulates in the proximal tubule, whose cells possess transporters for free and bound forms of Cd [4] and interferes with the tubular function.Cadmium nephropathy is characterized by low molecular weight (LMW) proteinuria due to diminished intrarenal uptake and catabolism of filtered proteins. In Cadmium nephropathy, proximal tubular dysfunction persists until renal failure supervenes.Although Cadmium nephropathy has been observed in workers exposed to high levels of Cd, recent data suggest that relatively low levels of exposure in people living in polluted industrial areas increase the risk of tubular dysfunction [1]. Furthermore, anal
Co-expression of statistically over-represented peptides in proteomes: a key to phylogeny ?
Luca Ferraro,Andrea Giansanti,Giovanni Giuliano,Vittorio Rosato
Quantitative Biology , 2004,
Abstract: It is proposed that the co-expression of statistically significant motifs among the sequences of a proteome is a phylogenetic trait. From the co-expression matrix of such motifs in a group of prokaryotic proteomes a suitable definition of a phylogenetic distance is introduced and the corresponding distance matrix between proteomes is constructed. From the distance matrix a phylogenetic tree is inferred, following a standard procedure. It compares well with a reference tree deduced from a distance matrix obtained from the alignment of ribosomal RNA sequences. Our results are consistent with the hypothesis that biological evolution manifests itself with a modulation of basic correlations between shared peptides of short length, present in protein sequences. Moreover, the simple procedure we propose reconfirms that it is possible, sampling entire proteomes, to average the effects of lateral gene transfer and infer reasonable phylogenies.
Bilocal Dynamics for Self-Avoiding Walks
Sergio Caracciolo,Maria Serena Causo,Giovanni Ferraro,Mauro Papinutto,Andrea Pelissetto
Physics , 1999, DOI: 10.1023/A:1018719226557
Abstract: We introduce several bilocal algorithms for lattice self-avoiding walks that provide reasonable models for the physical kinetics of polymers in the absence of hydrodynamic effects. We discuss their ergodicity in different confined geometries, for instance in strips and in slabs. A short discussion of the dynamical properties in the absence of interactions is given.
Alguns momentos do debate sobre as teorias do 'n?o-si' e das 'duas verdades' na história da filosofia buddhista
Ferraro, Giuseppe;
Kriterion: Revista de Filosofia , 2011, DOI: 10.1590/S0100-512X2011000100001
Abstract: the paper reconstructs some prominent stages of the development of the "non-self" and the "two truths" doctrines in buddhist philosophy, from original formulations of mainstream buddhism, to the conclusions reached by nāgārjuna, the founder of mahāyāna school of madhyamaka. during this concise reconstructions, some passages of nāgārjuna's mūlamadhyamikakārikās, which are crucial to clarify his (controversial) epistemological conception, will prove themselves similar, regarding the structuring and the development of the discourse, to the first part of milinda pa?ha, a para-canonical dialogue which takes an apofatic approach to deal with the topic of the 'ultimate truth'. this formal parallelism between the passages of the two texts suggests the possibility of a 'substantial' correspondence between the nagarjunian conception and that of milinda pa?ha with regard to the 'ultimately true'.
Revisión de la aloe vera (Barbadensis Miller) en la dermatología actual
Ferraro,GM;
Revista argentina de dermatolog?-a , 2009,
Abstract: the aloe vera is a popular plant used in the treatment of certain skin diseases that has a frequent application in cosmetology. it forms a part of diverse creams or gels, being used as anti-inflammatory and restorative of epithelial tissue. although there are several mechanisms of action and clinical indications, a review of its use should be done supported by controlled trials to determine its effectiveness.
Differenza epistemologica e identità ontologica tra Sa?sāra e Nirvā?a nel pensiero buddhista
Ferraro, Giuseppe;
Trans/Form/A??o , 2012, DOI: 10.1590/S0101-31732012000100012
Abstract: the difference between the concepts of sa?sāra e nirvā?aset forth by the historical buddha (vi-v b.c.) in his first sermon seem to be disputed by the equalization of the two terms effected by nāgārjuna (ii a.d) in a topical passage of his mk. this article, firstly, supports the thesis that the contradiction is just a seeming one and that the relation of difference or identity between the two dimensions depends on the philosophical register, respectively epistemological and ontological, being used - in both cases for soteriological purposes - by the buddha and nāgārjuna. secondly, we wish to prove that, in any case, nāgārjuna's ontology, far from being a philosophical novelty or an evolution of the thought of the founder of buddhism, is, on the contrary, one of the possible applications of the "non-self" doctrine (anātma-vāda) - probably the most important and original contribution of buddhist thought to the history of world philosophy - expounded by the buddha in his second sermon.
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