Ovigerous females of the estuarine crab (Neohelice granulate) were exposed to both pure glyphosate (2.5 mg/L and 5 mg/L) and a glyphosate formulation (Roundup Ultramax, containing glyphosate at 2.5 mg/L acid equivalent). At the end of the egg incubation period, a significant reduction in the number of hatched larvae was seen as a result of Roundup exposure. Additionally, several larvae abnormalities were seen in both pure glyphosate (2.5 mg/L) and Roundup treatments, such as hydropsy and hypopigmented eyes, and atrophied eyes were observed in the Roundup treatment. To evaluate the effect of the herbicide on ovarian rematuration, females remained exposed for 32 d. Pure glyphosate at 2.5 mg/L stimulated ovarian maturation over control levels, mainly in terms of a higher gonadosomatic index and a higher percentage of vitellogenic oocytes. A plausible hypothesis to be tested in further experiments is that exposure to glyphosate disrupts the hormonal system controlling reproduction.
El presente artículo parte del reporte de la experiencia pedagógica de los autores en torno a lo que ha permitido visibilizar la modalidad virtual de clases de educación musical debido al ASPO (aislamiento social preventivo y obligatorio) decretado a raíz de la pandemia por COVID-19 durante el ciclo lectivo 2020. A través del relato de la experiencia pedagógica de quienes escriben se observa el abordaje de contenidos comúnmente relegados o no trabajados de manera focal, hecho que se vincula con la posibilidad de desempeñarse con un mayor grado de autonomía respecto de los objetivos de las materias consideradas troncales y de los requerimientos institucionales, principalmente, la participación en los actos escolares. Para ello se revisan críticamente algunas de las representaciones que operan sobre los hábitos escolares y a partir de las cuales se establecen acuerdos tácitos que condicionan las prácticas áulicas. Finalmente, se pone en valor la singularidad de la experiencia estética (sensible, simbólica y compleja) que ofrece la música en el contexto escolar.
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