Exilio poético y exilio político: la polémica entre Liliana Heker y Julio Cortázar en la revista cultural El Ornitorrinco

Me propongo en este trabajo indagar en un acontecimiento particularmente sugerente en términos de complejidad sémica, en tanto se inserta en una zona de cruce entre la cultura literaria y la llamada “cultura de masas”. Me refiero a la polémica que mantuvieran los escritores argentinos Liliana Heker y Julio Cortázar desde la tribuna de El Ornitorrinco, revista cultural y foro político de resistencia a la última dictadura militar argentina.Facultad de Humanidades y Ciencias de la Educació

ACURACIDADE DE MÉTODOS DE CUBAGEM PARA ESTIMATIVA DO VOLUME DE Pinus taeda L.

O objetivo do estudo foi avaliar diferentes métodos para cubagem de povoamentos de Pinus taeda L. em três idades diferentes, a fim de verificar qual método é mais viável em inventários florestais. No total, foram amostradas 98 árvores, aplicando diferentes métodos de cubagem e comparando-as com o volume real (xilômetro). O experimento foi avaliado utilizando o delineamento inteiramente casualizado, onde cada árvore configurou uma repetição de dados e cada método de cubagem um tratamento. O teste de homogeneidade de Bartlett e análise de variância foram aplicados para todas as idades, seguidos do teste de Tukey a 5% de significância para comparar as médias dos volumes. Independentemente da idade, todos os métodos de cubagem superestimaram os volumes das árvores em relação ao volume verdadeiro. Para as idades de nove e treze anos, os volumes obtidos pelos métodos de cubagem de Huber, Pressler e Seccional Padrão apresentaram os menores desvios quando comparados com o volume real. Na idade 20 anos o método de Hohenadl (5 seções) apresentou a melhor precisão, seguido dos métodos de Huber, Seccional Padrão e Pressler. As árvores mais velhas (20 anos) apresentam, em geral, resíduos mais homogêneos que as árvores com idades mais jovens. O método de Huber apresentou melhores estimativas de volume nas três idades em estudo, diferindo estatisticamente do volume obtido com o xilômetro, apenas na idade de treze anos, onde nenhum outro método foi estatisticamente igual ao volume real. Os métodos de Smalian, 19 seções e da FAO foram os que apresentaram os piores resultados quando comparados com o volume real obtido com o xilômetro

Some virulence genes of Escherichia coli isolated from cloacal swabs of healthy Alagoas Curassows (Pauxi mitu) in Brazil

Birds of the Cracidae family (curassows, guans, and chachalacas) are endemic of the Neotropics and 50 species are currently classified. Brazil has 22 species, seven of which are considered threatened. The Alagoas Curassow (Pauxi mitu) species is considered extinct in the wild; but about 120 birds are alive in captivity. Conservation of this species depends entirely on correct management. Health reports of both wildlife and captive curassows are rare. In this study the presence of Escherichia coli was evaluated in 23 healthy Alagoas Curassows from two private breeding centres. E. coli was isolated from cloacal swabs, and the presence of genes encoding cytotoxic necrotising factor 1 (cnf1), alpha-haemolysin (hly), aerobactin (iuc), serum resistance (iss) and the following adhesions: S fimbriae (sfa), pili associated with pyelonephritis (pap) and temperature-sensitive haemagglutinin (tsh) were investigated. E. coli was isolated from 78.3% (18/23) of the birds, and the percentage of curassows colonized by E. coli was similar between the two facilities. From the 22 E. coli isolates, 15 (68.2%) were positive for at least one virulence factor by PCR, and the most frequently found gene was iss (50%). No curassows had clinical signs of disease. Nevertheless, the presence of some E. coli strains may be a concern to the wildlife in captivity. Additional health surveillance studies are essential to guarantee successful conservation programmes for threatened cracids in Brazil

CXCR2 is critical for bacterial control and development of joint damage and pain in Staphylococcus aureus-induced septic arthritis in mouse

Staphylococcus aureus is the main pathogen associated with septic arthritis. Upon infection, neutrophils are quickly recruited to the joint by different chemoattractants, especially CXCR1/2 binding chemokines. Although their excessive accumulation is associated with intense pain and permanent articular damage, neutrophils have an important function in controlling bacterial burden. This work aimed to study the role of CXCR2 in the control of infection, hypernociception and tissue damage in S. aureus-induced septic arthritis in mice. The kinetics of neutrophil recruitment correlated with the bacterial load recovered from inflamed joint after intra-articular injection of S. aureus. Treatment of mice from the start of infection with the non-competitive antagonist of CXCR1/2, DF2156A, reduced neutrophil accumulation, cytokine production in the tissue, joint hypernociception and articular damage. However, early DF2156A treatment increased the bacterial load locally. CXCR2 was important for neutrophil activation and clearance of bacteria in vitro and in vivo. Start of treatment with DF2156A 3 days after infection prevented increase in bacterial load and reduced the hypernociception in the following days, but did not improve tissue damage. In conclusion, treatment with DF2156A seems be effective in controlling tissue inflammation and dysfunction but its effects are highly dependent on the timing of the treatment start.status: publishe