"L’identité pathane et sa préservation"

Texte original : « Pathan Identity and its maintenance », dans F. Barth (dir.), Ethnic groups and boundaries. The social organization of culture difference, Bergen-Oslo/Londres, Universitets Forgelet/George Allen & Unwin, 1969, p. 117-134. Les Pathans (Pachtouns, Pakhtouns, Afghans) constituent un groupe ethnique important, doté d’une haute conscience de soi ; il occupe des régions voisines de l’Afghanistan et du Pakistan occidental ; il est généralement organisé en un système social segment..

A new model for in vitro testing of vitreous substitute candidates

Purpose: To describe a new model for in vitro assessment of novel vitreous substitute candidates. Methods: The biological impact of three vitreous substitute candidates was explored in a retinal explant culture model; a polyalkylimide hydrogel (Bio-Alcamid®), a two component hydrogel of 20 wt.% poly (ethylene glycol) in phosphate buffered saline (PEG) and a cross-linked sodium hyaluronic acid hydrogel (Healaflow®). The gels where applied to explanted adult rat retinas and then kept in culture for 2, 5 and 10 days. Gel-exposed explants were compared with explants incubated under standard tissue culture conditions. Cryosections of the specimens were stained with hematoxylin and eosin, immunohistochemical markers (GFAP, Vimentin, Neurofilament 160, PKC, Rhodopsin) and TUNEL. Results: Explants kept under standard conditions as well as PEG-exposed explants displayed disruption of retinal layers with moderate pyknosis of all neurons. They also displayed moderate labeling of apoptotic cells. Bio-Alcamid®-exposed explants displayed severe thinning and disruption of retinal layers with massive cell death. Healaflow®-treated explants displayed normal retinal lamination with significantly better preservation of retinal neurons compared with control specimens, and almost no signs of apoptosis. Retinas exposed to Healaflow® and retinas kept under standard conditions showed variable labeling of GFAP with generally low expression and some areas of upregulation. PEG-exposed retinas showed increased GFAP labeling and Bio-Alcamid®-exposed retinas showed sparse labeling of GFAP. Conclusions Research into novel vitreous substitutes has important implications for both medical and surgical vitreoretinal disease. The in vitro model presented here provides a method of biocompatibility testing prior to more costly and cumbersome in vivo experiments. The explant culture system imposes reactions within the retina including disruption of layers, cell death and gliosis, and the progression of these reactions can be used for comparison of vitreous substitute candidates. Bio-Alcamid® had strong adverse effects on the retina which is consistent with results of prior in vivo trials. PEG gel elicits reactions similar to the control retinas whereas Healaflow® shows protection from culture-induced trauma indicating favorable biocompatibility.Swedish Research CouncilUniversity of Lund. Medical FacultyPrincess Margaret's Foundation for Blind ChildrenKnut and Alice Wallenberg FoundationGeneral Sir John Monash Foundation (Scholarship)In Vivo Therapeutics Corporatio

#Nationalism: the ethno-nationalist populism of Donald Trump’s Twitter communication

In this article, we explore the ethno-nationalist populism of Donald Trump’s Twitter communication during the 2016 presidential campaign. We draw on insights from ethno-symbolism – a perspective within nationalism studies – to analyse all 5,515 tweets sent by Trump during the campaign. We find that ethno-nationalist and populist themes were by far the most important component of Trump’s tweets, and that these themes built upon long-standing myths and symbols of an ethnic conception of American identity. In sum, Trump’s tweets depicted a virtuous white majority being threatened by several groups of immoral outsiders, who were identified by their foreignness, their religion, and their self-interestedness. The struggle against these groups was framed as a mission to restore America to a mythical golden age – to “Make America Great Again.

Language, Religion, and Ethnic Civil War

Are certain ethnic cleavages more conflict-prone than others? While only few scholars focus on the contents of ethnicity, most of those who do argue that political violence is more likely to occur along religious divisions than linguistic ones. We challenge this claim by analyzing the path from linguistic differences to ethnic civil war along three theoretical steps: (1) the perception of grievances by group members, (2) rebel mobilization, and (3) government accommodation of rebel demands. Our argument is tested with a new data set of ethnic cleavages that records multiple linguistic and religious segments for ethnic groups from 1946 to 2009. Adopting a relational perspective, we assess ethnic differences between potential challengers and the politically dominant group in each country. Our findings indicate that intrastate conflict is more likely within linguistic dyads than among religious ones. Moreover, we find no support for the thesis that Muslim groups are particularly conflict-prone

Ethnic mirrors: self-representations in the Welsh and Mennonite museums in Argentina and Paraguay

According to some scholars and philosophers, ethnic identities are the best political, social, economic, ethic (and even aesthetic) alternative to State centralism, which is incapable of dealing with cultural diversity. Ethnic communitarism is then defined as a more authentic, humane, democratic and inclusive form of organization. The Welsh colonies of Chubut (Argentine) and the established Mennonite colonies of the Chaco Region (Paraguay) are two ethnic groups with forms of community life that have been thoroughly studied from different perspectives. However, neither has been analyzed their point of view of alterity or their relation with those who do not belong to the community. In their museums the history of the community is represented, self-images and other people's images are constructed and spread. The interesting part of these stories is not what they say but what they do, the form in which contents are expressed. These communitarian historical museums tell about the past but they mainly have an impact on the present. Like national or even imperial museums, Welsh and Mennonite museums tend to naturalize a particular self-centered, prejudicial and evolutionist point of view that often excludes other perspectives, especially those elaborated by the neighboring indigenous communities. In contrast, we believe it is necessary to take a stance for democratic, horizontal relations between communities and more polyphonic and responsible historical representations.Alguns filósofos e acadêmicos assinalam que as identidades étnicas são a melhor alternativa política, social, econômica, ética (e mesmo estética) ao centralismo estatal, que é negligente ao lidar com a diversidade cultural. O comunitarismo étnico é definido como uma forma de organização mais autêntica, humana, democrática e inclusiva. As colônias galesas de Chubut (Argentina) e as colônias rurais dos menonitas no Chaco (Paraguay) são dois grupos étnicos cujas vidas comunitárias têm sido muito estudadas desde diversas perspectivas, mas o seu ponto de vista acerca da alteridade ou sua relação com os atores extracomunitários nunca foi levado em conta. A historia comunitária é representada nos museus galeses e menonitas das respectivas regiões e aí são construídas e difundidas não só as autoimagens mas também as representações dos outros. O aspecto relevante dessas histórias não é o que elas dizem, mas o que fazem, a forma como os conteúdos são expressos. Esses museus históricos comunitários falam sobre o passado, mas seu maior impacto recai sobre o presente. Como os museus nacionais ou imperiais, os museus galeses e menonitas tentam naturalizar pontos de vista particulares, auto-centrados, preconceituosos e evolucionistas que geralmente excluem as perspectivas elaboradas pelas comunidades indígenas vizinhas. Em vez disso, pensamos ser necessário criar relações mais horizontais e democráticas entre as comunidades e difundir representações históricas mais polifônicas e responsáveis