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Search Results: 1 - 10 of 840 matches for " Susanna Perego "
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A Set of GRASS GIS-Based Shell Scripts for the Calculation and Graphical Display of the Main Morphometric Parameters of a River Channel  [PDF]
Aldo Clerici, Susanna Perego
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.72011
Abstract: For the analysis of river evolution, the use of quantitative parameters can be quite useful in order to assess changes in the channel planform. Among the several parameters proposed by different authors in a number of papers, channel length and width, braiding and sinuosity indexes, and channel lateral shifting are proved to be the most effective ones for a quantitative analysis of river changes. However, the calculation of these parameters is time-consuming, tedious and error-prone, even where made in a GIS environment. This work describes four shell scripts that perform fast and automatic calculation of the morphometric parameters and draw curves showing thevariation of the calculated parameters along the entire channel development. The scripts arebased on commands of the GRASS GIS free and open source software and, as input, they require a simple vector map containing the essential features of a river channel,i.e.bankfull channel limits and longitudinal and lateral bars.
Magic and Ritual in Iron Age Veneto, Italy
Elisa Perego
Papers from the Institute of Archaeology , 2010, DOI: 10.5334/pia.342
Abstract: In this article I discuss the possibility that the Iron Age Veneti of Northern Italy believed in magic. By drawing on ethno-historical comparisons and contextual analysis, I suggest that items such as pierced shells, coral, amber, glass beads and bronze pendants were possibly employed as amulets by children, women and, far more rarely, by men. I also examine the placing of selected non-edible animal remains such as horns, teeth, and astragali (knucklebones) in ritual contexts, suggesting than their meaning, whether magical, religious or more mundane, can be understood only through a careful evaluation of the circumstances of deposition. I finally point out that the study of magic in prehistory has been often passed over and devalued, probably for a lack of written sources and proper evidence. On the contrary, I argue that a more holistic approach to ritual and to the several layers of meaning embedded in magical objects can offer valuable insights into wider issues such as the management of power and the construction of past individuals' social and personal identities.
Women’s Voices in a Male World: Actions, Bodies, and Spaces Among the Ancient Maya
Elisa Perego
Papers from the Institute of Archaeology , 2007, DOI: 10.5334/pia.303
Abstract: Feminist archaeology has prompted scholars to reconsider gender roles in ancient Mesoamerica.Current research, however, tends to focus on elite women, classes and sites. Although I do not ignore the potential of these sources, in this paper I am mainly concerned with issues such as the phenomenology of bodies and spaces, subroyal ritual actions, and daily activities such as cooking and weaving. My aim is to offer an overview of the most recent studies on gender in Maya archaeology and to provide ideas for further research by emphasising the need to engender ritual and individuate female discourses in the archaeological record.
Forty Years in the Making: Understanding the Molecular Mechanism of Peptide Regulation in Bacterial Development
Marta Perego
PLOS Biology , 2013, DOI: 10.1371/journal.pbio.1001516
Abstract: Signal transduction systems are influenced by positive and negative forces resulting in an output reflecting the sum of the opposing forces. The Rap family of regulatory protein modules control the output of two-component signal transduction systems through protein:protein and protein:peptide interactions. These modules and their peptide regulators are found in complex signaling pathways, including the bacterial developmental pathway to sporulation, competence, and protease secretion. Two articles published in the current issue of PLOS Biology reveal by means of crystallographic analyses how the Rap proteins of bacilli are regulated by their inhibitor Phr peptide and provide a mechanistic explanation for a genetic phenotype isolated decades earlier. The Rap-Phr module of bacterial regulators was the prototype of a family that now extends to other bacterial signaling proteins that involve the use of the tetratricopeptide repeat structural fold. The results invite speculation regarding the potential exploitation of this module as a molecular tool for applications in therapeutic design and biotechnology.
Ramification of Quaternion Algebras over Stable Elliptic Surfaces
Arvid Perego
Mathematics , 2007,
Abstract: We give a geometrical criterion to determine when a quaternion algebra over the function field of a stable elliptic surface X is an Azumaya algebra over X.
The 2-Factoriality of the O'Grady Moduli Spaces
Arvid Perego
Mathematics , 2009,
Abstract: The aim of this work is to show that the moduli space $M_{10}$ introduced by O'Grady in \cite{OG1} is a $2-$factorial variety. Namely, $M_{10}$ is the moduli space of semistable sheaves with Mukai vector $v:=(2,0,-2)\in H^{ev}(X,\mathbb{Z})$ on a projective K3 surface $X$. As a corollary to our construction, we show that the Donaldson morphism gives a Hodge isometry between $v^{\perp}$ (sublattice of the Mukai lattice of $X$) and its image in $H^{2} (\widetilde{M}_{10},\mathbb{Z})$, lattice with respect to the Beauville form of the $10-$dimensional irreducible symplectic manifold $\widetilde{M}_{10}$, obtained as symplectic resolution of $M_{10}$. Similar results are shown for the moduli space $M_{6}$ introduced by O'Grady in \cite{OG2}.
A Gabriel Theorem for Coherent Twisted Sheaves
Arvid Perego
Mathematics , 2006,
Abstract: We give a generalization of Gabriel's Theorem on coherent sheaves to the case of coherent twisted sheaves on a smooth variety X over a field k. We show that the category Coh(X,\alpha) determines the scheme structure of X for \alpha in the Brauer group of X, and that any equivalence between Coh(X,\alpha) and Coh(Y,\beta) induces an isomorphism between X and Y. In conclusion we prove the saturatedness of D^b(X,\alpha).
A note on deformations of moduli spaces of sheaves on K3 surfaces
Arvid Perego
Mathematics , 2011,
Abstract: In this paper we study deformation classes of moduli spaces of sheaves on a projective K3 surface. More precisely, let $(S1,H1)$ and $(S2,H2)$ be two polarized K3 surfaces, $m\in\mathbb{N}$, and for $i=1,2$ let $mv_{i}$ be a Mukai vector on $S_{i} such that $H_{i}$ is $mv_{i}-$generic. Moreover, suppose that the moduli spaces $M_{mv_{1}}(S_{1},H_{1})$ of $H_{1}-$semistable sheaves on $S_{1}$ of Mukai vector $mv_{1}$ and $M_{mv_{2}}(S_{2},H_{2})$ of $H_{2}-$semistable sheaves on $S_{2}$ with Mukai vector $mv_{2}$, have the same dimension. The aim of this paper is to prove that $M_{mv_{1}}(S_{1},H_{1})$ is deformation equivalent to $M_{mv_{2}}(S_{2},H_{2})$, showing a conjecture of Z. Zhang contained in [18].
Cyclosporine-Associated Nephrotoxicity  [PDF]
Maria Delia Colombo, Renata Perego, Gilberto Bellia
Open Journal of Nephrology (OJNeph) , 2013, DOI: 10.4236/ojneph.2013.33030
Abstract:

Cyclosporine (CsA) has revolutionized transplant medicine and is currently one of the most important immunosuppressive agents for a wide range of organ transplantations and of autoimmune and inflammatory diseases, such as rheumatoid arthritis, uveitis, psoriasis, and atopic dermatitis. Renal impairment represents the main limitation to CsA long-term continuous therapy. However, it has been shown that nephrotoxicity is associated with longer treatment duration, larger cumulative doses and higher daily dose of CsA. With low dose regimens (<5 mg/kg/day), stable serum creatinine levels have been observed up to 15-20 years after kidney transplantation. Intermittent therapy may offer a good therapeutic strategy to limit long-term renal dysfunction, given the fact that renal structural changes are dose- and time-dependent. The best predictor of permanent renal damage is a persistent increase in serum creatinine level one month after treatment withdrawal. In patients with autoimmune diseases, the percentage increase in serum creatinine above baseline value during CsA therapy has been shown to predict CsA-induced nephropathy. Before CsA therapy initiation, patients should undergo a thorough baseline evaluation including laboratory assessments, in particular electrolytes, serum creatinine, and urea levels. Furthermore, patients should be evaluated for factors that might increase the risk of nephrotoxicity, such as obesity, older age, hypertension, concomitant use of nephrotoxic drugs, and pre-existing renal conditions. In the present paper, CsA-induced nephropathy will be reviewed in terms of pathophysiology, pathologic and clinical findings, and strategies for prevention and management.

Misperceptions of peer gambling norms among adolescents: Analysis of a national sample in Finland  [PDF]
Susanna Raisamo, Tomi Lintonen
Open Journal of Preventive Medicine (OJPM) , 2012, DOI: 10.4236/ojpm.2012.22019
Abstract: Introduction: Misperceptions of peer drinking norms are widely documented in the US student populations and are associated with increased personal consumption. Few studies have examined misperceptions of peer gambling, and none of these have been conducted among adolescents in the European context. In a national sample, we examined misperceptions of peer gambling in Finland. Tenets of the social norms approach form a framework for discussion of the findings. Methods: Participants were 4526 adolescents aged 12 to 18 years who completed the nationwide Adolescent Health and Lifestyle Survey in 2011. Main measures were gambling behavior and the perception of same age-sex peers’ gambling. Misperception was an overestimation of the frequency of gambling by others compared to the actual frequency of gambling. Results: Adolescents held substantial misperceptions of peer gambling, imagining they gambled much more than they actually did. Age, sex, and gambling behavior were correlated with the perceptions. The extent of misperception was greatest among monthly gamblers, whereas non-gamblers and daily gamblers were more accurate in their perceptions. Estimations of peers’ gambling frequency were more accurate in boys than in girls and among those aged 12 years than among older adolescents. Conclusion: Our findings suggest that adolescent gambling prevention efforts could benefit from adopting a social norms approach; that is, correcting gambling-related misperceptions might discourage gambling and protect adolescents from adopting more severe gambling patterns.
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