Hematological and physiological changes in the blood of juveniles of the freshwater fish, Prochilodus scrofa were determined after acute exposure to 20, 25, and 29 µgCu L -1 in water (pH 7.5; hardness 24.5 mg L -1 as CaCO 3 ) for 96 h. Copper exposure to 25 and 29 µgCu L -1 caused significant increase in the hematocrit and red blood cell values. The increase in red blood cells was associated with increase in whole blood hemoglobin only in fish exposed to 29 µgCu L -1 . Leukocytes increased following copper exposure and were significantly higher in fish exposed to 29 µgCu L -1 . Differential leukocyte percentage displayed significant reduction in lymphocytes and an increase in neutrophils in fish exposed to 25 and 29 µgCu L -1 . The percentage of monocytes remained unchanged after copper exposure. The thrombocytes did not change. There was a significant decrease in plasma [Na + ] and [Cl -] and a significant drop in blood pH in fish exposed to 25 and 29 µgCu L -1 while [K + ] showed significant increase in fish exposed to 29 µgCu L -1 . Copper exposure led to ionoregulatory impairment, although chloride cell hypertrophy was induced. The changes in red blood cells suggest a compensatory response to respiratory surface reduction of gills (tissue damage and cell proliferation) in order to maintain oxygen transference from water to the tissues, allowing the fish to survive during the so-called shock phase of LC 50 exposure, at least while at rest. tenha sido induzida, e as mudanças nos parâmetros hematológicos sugerem resposta compensatória à redução da superfície respiratória das brânquias (lesões no tecido branquial e proliferação celular) de forma a manter a transferência do oxigênio da água para o sangue, permitindo a sobrevivência dos peixes durante a fase de choque da exposição a CL 50 , pelo menos, sob condições de repouso.Palavras-chave: cobre, parâmetros hematológicos, íons plasmáticos, histopatologia branquial, Prochilodus scrofa.

No abstract

No abstract

No abstract

RESUMO -Educar: da alteridade ao estilo. No conjunto de pesquisas em educação escolar identifica-se a crença de que a solução dos impasses na transmissão consiste na criação de novas metodologias de ensino. A presente pesquisa propõe redimensionar tal confiança e a compreende como uma ilusão sobre a possibilidade de controle dos resultados na transmissão da cultura na escola. Trata-se de um aprofundamento na noção de estilo no âmbito da tarefa do educador, a partir das proposições psicanalíticas. A psicanálise compreende que sustentar a transmissão significa suportar uma posição que exige a renúncia dos ideais de perfeição. O sujeito está implicado em todo ato e, na transmissão, isso se traduz na relação singular do educador com o conhecimento: seu estilo. Palavras-chave: Educação. Transmissão. Estilo. Alteridade. Psicanálise. ABSTRACT -Educate: from otherness to style. In the body of research on school education identifies the belief that the solution to the impasse in the transmission is the creation of new teaching methodologies. This research proposes resize trust and understand how such an illusion about the possibility of tracking results in the transmission of culture in school. This is a deeper sense of style in the task of the educator from the psychoanalytic propositions. Psychoanalysis understands that sustain transmission means supporting a position that demands the resignation of the ideals of perfection. The subject is involved in any act and, in transmission, this translates into unique relationship with the educator's knowledge: his style.