Suchergebnisse

Abstract Stuart Hall, a founding scholar in the Birmingham School of cultural studies and eminent theorist of ethnicity, identity and difference in the African diaspora, as well as a leading analyst of the cultural politics of the Thatcher and post-Thatcher years, delivered the W. E. B. Du Bois Lectures at Harvard University in 1994. In the lectures, published after a nearly quarter-century delay as The Fateful Triangle: Race, Ethnicity, Nation (2017), Hall advances the argument that race, at least in North Atlantic contexts, operates as a 'sliding signifier,' such that, even after the notion of a biological essence to race has been widely discredited, race-thinking nonetheless renews itself by essentializing other characteristics such as cultural difference. Substituting Michel Foucault's famous power-knowledge dyad with power-knowledge-difference, Hall argues that thinking through the fateful triangle of race, ethnicity and nation shows us how discursive systems attempt to deal with human difference. In 'Fateful Triangles in Brazil,' Part II of Contexto Internacional's forum on The Fateful Triangle, three scholars work with and against Hall's arguments from the standpoint of racial politics in Brazil. Sharon Stanley argues that Hall's account of hybrid identity may encounter difficulties in the Brazilian context, where discourses of racial mixture have, in the name of racial democracy, supported anti-black racism. João Nackle Urt investigates the vexed histories of 'race,' 'ethnicity' and 'nation' in reference to indigenous peoples, particularly Brazilian Indians. Finally, Thiago Braz shows, from a perspective that draws on Afro-Brazilian thinkers, that emphasizing the contingency of becoming in the concept of diaspora may ignore the myriad ways by which Afro-diasporic Brazilians are marked as being black, and thus subject to violence and inequality. Part I of the forum – with contributions by Donna Jones, Kevin Bruyneel and William Garcia – critically examines the promise and potential problems of Hall's work from the context of North America and western Europe in the wake of #BlackLivesMatter and Brexit.

Abstract Stuart Hall, a founding scholar in the Birmingham School of cultural studies and eminent theorist of ethnicity, identity and difference in the African diaspora, as well as a leading analyst of the cultural politics of the Thatcher and post-Thatcher years, delivered the W. E. B. Du Bois Lectures at Harvard University in 1994. In the lectures, published after a nearly quarter-century delay as The Fateful Triangle: Race, Ethnicity, Nation (2017), Hall advances the argument that race, at least in North Atlantic contexts, operates as a 'sliding signifier,' such that, even after the notion of a biological essence to race has been widely discredited, race-thinking nonetheless renews itself by essentializing other characteristics such as cultural difference. Substituting Michel Foucault's famous power-knowledge dyad with power-knowledge-difference, Hall argues that thinking through the fateful triangle of race, ethnicity and nation shows us how discursive systems attempt to deal with human difference. In 'Fateful Triangles in Brazil,' Part II of Contexto Internacional's forum on The Fateful Triangle, three scholars work with and against Hall's arguments from the standpoint of racial politics in Brazil. Sharon Stanley argues that Hall's account of hybrid identity may encounter difficulties in the Brazilian context, where discourses of racial mixture have, in the name of racial democracy, supported anti-black racism. João Nackle Urt investigates the vexed histories of 'race,' 'ethnicity' and 'nation' in reference to indigenous peoples, particularly Brazilian Indians. Finally, Thiago Braz shows, from a perspective that draws on Afro-Brazilian thinkers, that emphasizing the contingency of becoming in the concept of diaspora may ignore the myriad ways by which Afro-diasporic Brazilians are marked as being black, and thus subject to violence and inequality. Part I of the forum – with contributions by Donna Jones, Kevin Bruyneel and William Garcia – critically examines the promise and potential problems of Hall's work from the context of North America and western Europe in the wake of #BlackLivesMatter and Brexit.

A elaboração e utilização de minissilo de polietileno poderia contribuir para as análises de silagens experimentais, por utilizar material já empregado para a produção e comercialização de silagem ensacada, o que permitiria condições de fermentação mais próximas àquelas observados no campo. Objetivou-se neste estudo, avaliar os perfis fermentativos das silagens de capim elefante em minissilos de tubo policrometo de vinila (PVC) ou de sacos de polietileno inoculados com fungos do trato digestório bovino. O experimento foi conduzido em delineamento inteiramente casualizado, em fatorial 2x2, comparando-se a adição (MIX) ou não (CONT) dos fungos celulolíticos para a fermentação do capim elefante acondicionado nesses dois tipos de minissilos, com sete repetições para cada tratamento. O uso do minissilo de saco de polietileno quando comparado com de tubo PVC não apresentou diferença significativas nos parâmetros bromatológicos, estabilidade aeróbica, pH na abertura, entretanto na contagem de estreptobastonetes houve diferença significativa para a contagem de populações microbianas na abertura. As médias dos valores de pH dos minissilos na abertura se mantiveram < 4,5, houve diferença entre o MIXSACO (4,4) e o controle saco (CONTSACO) (3,83) (p= 0,004). Os minissilos CONTSACO apresentaram menor tempo de estabilidade (1,57 dias) em comparação com os demais minissilos (p=0,002). A utilização do saco de polietileno não prejudicou o processo fermentativo da forragem, sendo assim uma alternativa viável para substituição do silo de tubo PVC para produção de silos laboratoriais.Palavras-chave: Pennisetum purpureum. Minissilo. Forragem Tropical. Microrganismos Ruminais. Conservação de Forragem
AbstractThe development and use of polyethylene minisilo could contribute to the analysis of experimental silages, by using material already used for the production and commercialization of baged silage, which would allow fermentation conditions closer to those observed in the field. The objective of this study was to evaluate the fermentative profiles of elephant grass silages in polyvinyl chloride tube (PVC) minisilos or polyethylene bags inoculated with fungi from the bovine digestive tract. The experiment was conducted in a completely randomized design, in a 2x2 factorial, comparing the addition (MIX) or not (CONT) of cellulolytic fungi for the fermentation of elephant grass packed in these two types of minisilos, with seven replications for each treatment. The use of the polyethylene bag minisilo when compared to PVC tube showed no significant difference in bromatological parameters, aerobic stability, pH at opening, however in the count of streptobastonetes there was a significant difference for the counting of microbial populations at the opening. Themean of the pH values of the minisilos at the opening remained < 4.5, there was difference between MIXBAG (4.4) and bag control (CONTBAG) (3.83) (p= 0.004). CONTBAG minisilos showed shorter stability time (1.57 days) compared to other minisilos (p=0.002). The use of the polyethylene bag did not harm the forage fermentation process, thus being a viable alternative for replacing the PVC tube silo for the production of laboratory silos.
Keywords: Pennisetum purpureum. Minissilo. Tropical Forage. Ruminal Microorganisms. Forage Conservation

The goal was to determine the ideal cutting age of elephant grass BRS Canará for forage production in the dry and rainy seasons. The experimental design comprised randomized blocks, with five treatments (42, 56, 70, 84, and 98 days in the dry season and 42, 60, 76, 91, and 105 days of regrowth in the rainy season) and four replications each. Agronomic, morphological, and chemical characteristics were evaluated. In the dry season, there was a significant quadratic response for plant height and leaf blade length. For the other characteristics, a significant linear response was observed, except stem diameter. In the rainy season, a quadratic response for the leaf blade length, leaf blade width, and leaf:stem ratio was observed. For the other characteristics, there was a significant linear effect, except for the percentage of dead material. In the dry season, a verified linear response was observed for the chemical characteristics, except neutral detergent insoluble protein. In the rainy season, a linear response was verified for all evaluated characteristics, except acid detergent insoluble protein. Elephant grass BRS Canará for forage production should be cut between 70 and 85 days in the dry season and between 60 and 70 days of regrowth in the rainy season.