Oestrus ovis infection of grazing sheep during summer in southern Chile

Oestrus ovis is a botfly whose larvae cause nasal myiasis, an environmental-dependent disease in small ruminants, generating acute and chronic injuries in the cranial cavities of sheep. Chile is a country of the southernmost worldwide distribution of this parasite, and there is few information about. Whence, the objective of this study was to approximate the epidemiological situation of O. ovis infection in Chilean sheep. From December 2009 to March 2010, a total of 87 samples were obtained by necropsy for skull inspection. The larvae were collected, and microscopically identified. The prevalence in the sampled sheep was 60.9%. From those that were infected, 85.7% (18/21) of sheep were 1 to 3 years old, constituting the stratum with the highest prevalence. The difference of infection in females and males was not significant. The high risk of infection seems to be dependent upon the environmental conditions of this southern region, especially during summer when the first larval stage (L1) could be found as the evidence. Therefore, the disease should be considered as a significant problem for this kind of livestock production.

La dialéticas diversidad/desigualdad y decadencia/progreso en el pensamiento eugenésico argentino / The dialectics of diversity/inequality and decline/progress in eugenics argentine thinking

En este breve trabajo, en cambio, quiero ocuparme de dos pares de conceptos que se constituyen, en tanto tensiones , como verdaderas condiciones de posibilidad de la intervención eugénica: diversidad/desigualdad por un lado y decadencia/progreso. Tensiones iressueltas, problemente irresolubles en términos teóricos, que lejos de reclamar una opción por uno de los polos se constituyen en la dialética que sólo se resuelve con la intervención político-tecnológica. Estas consideraciones alcanzan al movimiento eugenésico en su conjunto, pero, dada la gran extensión y relativa heterogeniedad de éste, es posible hallar variadas mediaciones y ricos matices, por lo cual este trabajo se acupará de analizar las dos tensiones mencionadas dentro del movimento eugenista argentino.

Eugenesia y educación en la Argentina / Eugenics and education in Argentina

Se ocupa de algunas modalidades de la relación entre eugenesia y educación em Argentina, aunque hace referencia a planteos más generales