266 resultados para Clifford, Algebra de


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Let X be a connected, noetherian scheme and A{script} be a sheaf of Azumaya algebras on X, which is a locally free O{script}-module of rank a. We show that the kernel and cokernel of K(X) ? K(A{script}) are torsion groups with exponent a for some m and any i = 0, when X is regular or X is of dimension d with an ample sheaf (in this case m = d + 1). As a consequence, K(X, Z/m) ? K(A{script}, Z/m), for any m relatively prime to a. © 2013 Copyright Taylor and Francis Group, LLC.

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Social psychologists have attempted to capture the ideological quality of the nation through a consideration of its taken-for-granted quality, whereby it forms an unnoticed ‘banal’ background to everyday life and is passively absorbed by its members in contrast to its ‘hot’, politically created and contested nature. Accordingly, national identity is assumed to be both passively absorbed from the national backdrop and actively acquired through national inculcation. This raises the question of how national identity is expressed, transmitted and acquired in a foreign context, where the banal national backdrop is unavailable to scaffold identity and the national resources for identity transmission may be unavailable. The present article addresses this gap by examining the situation of Irish women raising children in England. Critical discursive analyses of the 16 interviews revealed that all women treated their children’s national identity and the issue of transmitting identity as dilemmatic: passive transmission risks children passively absorbing English, but active transmission contravenes the assumed naturalness of national identity and can furthermore conflict with children’s own personal choice. These results point to the complex interaction between the management of national identity and the broader personal and national context within which this occurs.

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Respiratory syncytial viral (RSV) infections are a frequent cause of chronic obstructive pulmonary disease (COPD) exacerbations, which are a major factor in disease progression and mortality. RSV is able to evade antiviral defenses to persist in the lungs of COPD patients. Though RSV infection has been identified in COPD, its contribution to cigarette smoke-induced airway inflammation and lung tissue destruction has not been established. Here we examine the long-term effects of cigarette smoke exposure, in combination with monthly RSV infections, on pulmonary inflammation, protease production and remodeling in mice. RSV exposures enhanced the influx of macrophages, neutrophils and lymphocytes to the airways of cigarette smoke exposed C57BL/6J mice. This infiltration of cells was most pronounced around the vasculature and bronchial airways. By itself, RSV caused significant airspace enlargement and fibrosis in mice and these effects were accentuated with concomitant smoke exposure. Combined stimulation with both smoke and RSV synergistically induced cytokine (IL-1a, IL-17, IFN-c, KC, IL-13, CXCL9, RANTES, MIF and GM-CSF) and protease (MMP-2, -8, -12, -13, -16 and cathepsins E, S, W and Z) expression. In addition, RSV exposure caused marked apoptosis within the airways of infected mice, which was augmented by cigarette smoke exposure. RSV and smoke exposure also reduced protein phosphatase 2A (PP2A) and protein tyrosine phosphates (PTP1B) expression and activity. This is significant as these phosphatases counter smoke-induced inflammation and protease expression. Together, these findings show for the first time that recurrent RSV infection markedly enhances inflammation, apoptosis and tissue destruction in smoke-exposed mice. Indeed, these results indicate that preventing RSV transmission and infection has the potential to significantly impact on COPD severity and progression.

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Researchers have argued that, depending on the framing of the Northern Ireland conflict, each group could either be a minority or a majority relative to the other. This complicates macrosocial explanations of the conflict which make specific predictions on the basis of minority or majority positions. The present paper argues that this conundrum may have arisen from the inherent variability in microidentity processes that do not fit easily with macroexplanations. In this paper the rhetoric of relative group position is analysed in political speeches delivered by leading members of an influential Protestant institution in Northern Ireland. It is apparent that minority and majority claims are not fixed but are
flexibly used to achieve local rhetorical goals. Furthermore, the speeches differ before and after the Good Friday Agreement, with a reactionary “hegemonic” Unionist position giving way to a “majority-rights power sharing” argument and a “pseudo-minority” status giving way to a “disempowered minority” argument. These results suggest a view of the Northern Ireland conflict as a struggle for “symbolic power,” i.e., the ability to flexibly define the intergroup situation to the ingroup’s advantage.

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The growing popularity of English national insignia in international football tournaments has been widely interpreted as evidence of the emergence of a renewed English national consciousness. However, little empirical research has considered how people in England actually understand football support in relation to national identity. Interview data collected around the time of the Euro 2000 and the 2002 World Cup tournaments fail to substantiate the presumption that support for the England football team maps onto claims to patriotic sentiment in any straightforward way. People with far-right political affiliations did generally use national football support to symbolise a general pride in English national identity. However, other people either claimed not to support the England national team precisely because of its associations with nationalism, or else bracketed the domain of football support from more general connotations of English patriotism.

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Social scientific work on the suppression, mitigation or denial of prejudiced attitudes has tended to focus on the strategic self-presentation and self-monitoring undertaken by individual social actors on their own behalf. In this paper, we argue that existing perspectives might usefully be extended to incorporate three additional considerations. First, that social actors may, on some occasions, act to defend not only themselves, but also others from charges of prejudice. Second, that over the course of any social encounter, interactants may take joint responsibility for policing conversation and for correcting and suppressing the articulation of prejudiced talk. Third, that a focus on the dialogic character of conversation affords an appreciation of the ways in which the status of any particular utterance, action or event as 'racist' or 'prejudiced' may constitute a social accomplishment. Finally, we note the logical corollary of these observations - that in everyday life, the occurrence of 'racist discourse' is likely to represent a collaborative accomplishment, the responsibility for which is shared jointly between the person of the speaker and those other co-present individuals who occasion, reinforce or simply fail to suppress it.

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In this article we question recent psychological approaches that equate the constructs of citizenship and social identity and which overlook the capacity for units of governance to be represented in terms of place rather than in terms of people. Analysis of interviews conducted in England and Scotland explores how respondents invoked images of Britain as “an island” to avoid social identity constructions of nationality, citizenship, or civil society. Respondents in Scotland used island imagery to distinguish their political commitment to British citizenship from questions relating to their subjective identity. Respondents in England used island imagery to distinguish the United Kingdom as a distinctive political entity whilst avoiding allusions to a common or distinctive identity or character on the part of the citizenry. People who had moved from England to Scotland used island imagery to manage the delicate task of negotiating rights to social inclusion in Scottish civil society whilst displaying recognition of the indigenous population’s claims to distinctive national culture and identity.

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Advocates of semi-structured interview techniques have often argued that rapport may be built, and power inequalities between interviewer and respondent counteracted, by strategic self-disclosure on the part of the interviewer. Strategies that use self-disclosure to construct similarity between interviewer and respondent rely on the presumption that the respondent will in fact interpret the interviewer's behaviour in this way. In this article we examine the role of interviewer self-disclosure using data drawn from three projects involving interviews with young people. We consider how an interviewer's attempts to ‘do similarity’ may be interpreted variously as displays of similarity or, ironically, as indicators of difference by the participant, and map the implications that this may have for subsequent interview dialogue. A particular object of concern relates to the ways in which self-disclosing acts may function in the negotiation of category entitlement within interview interactions.

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A total sample of three hundred and sixty (N=360) Irish children and adults, drawn from nine age groups, were administered the specially designed Legal Knowledge and Perception of Court Interview Schedule. Analyses of variance revealed a main effect for age of participant. Participants demonstrated increasing knowledge of the legal system with increasing age. The findings of the present study suggest inter alia that Irish children, particularly those under nine years of age, do not possess sufficient understanding of the legal system to enable them to participate as effectively as they might as witnesses. The potential for developing a systematic programme of preparing child witnesses for their involvement in the legal process is discussed.

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Let C be a bounded cochain complex of finitely generatedfree modules over the Laurent polynomial ring L = R[x, x−1, y, y−1].The complex C is called R-finitely dominated if it is homotopy equivalentover R to a bounded complex of finitely generated projective Rmodules.Our main result characterises R-finitely dominated complexesin terms of Novikov cohomology: C is R-finitely dominated if andonly if eight complexes derived from C are acyclic; these complexes areC ⊗L R[[x, y]][(xy)−1] and C ⊗L R[x, x−1][[y]][y−1], and their variants obtainedby swapping x and y, and replacing either indeterminate by its inverse.

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We prove that if G is S1 or a profinite group, then all of the homotopical information of the category of rational G-spectra is captured by the triangulated structure of the rational G-equivariant stable homotopy category.

That is, for G profinite or S1, the rational G-equivariant stable homotopy category is rigid. For the case of profinite groups this rigidity comes from an intrinsic formality statement, so we carefully relate the notion of intrinsic formality of a differential graded algebra to rigidity.

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Elafin is a serine protease inhibitor produced by epithelial and immune cells with anti-inflammatory properties. Research has shown that dysregulated protease activity may elicit proteolytic cleavage of elafin, thereby impairing the innate immune function of the protein. The aim of this study was to generate variants of elafin (GG- and QQ-elafin) that exhibit increased protease resistance while retaining the biological properties of wild-type (WT) elafin. Similar to WT-elafin, GG- and QQ-elafin variants retained antiprotease activity and susceptibility to transglutaminase-mediated fibronectin cross-linking. However, in contrast to WT-elafin, GG- and QQ-elafin displayed significantly enhanced resistance to degradation when incubated with bronchoalveolar lavage fluid from patients with cystic fibrosis. Intriguingly, both variants, particularly GG-elafin, demonstrated improved lipopolysaccharide (LPS) neutralization properties in vitro. In addition, GG-elafin showed improved anti-inflammatory activity in a mouse model of LPS-induced acute lung inflammation. Inflammatory cell infiltration into the lung was reduced in lungs of mice treated with GG-elafin, predominantly neutrophilic infiltration. A reduction in MCP-1 levels in GG-elafin treated mice compared to the LPS alone treatment group was also demonstrated. GG-elafin showed increased functionality when compared to WT-elafin and may be of future therapeutic relevance in the treatment of lung diseases characterized by a protease burden.