Estudio de fallas causadas por cucarachas en fuente conmutada

Se presenta en este artículo una investigación llevada a cabo en el LIADE, Laboratorio de Investigación Aplicada y Desarrollo de la Facultad de Ciencias Exactas, Físicas y Naturales de la Universidad Nacional de Córdoba tendiente a localizar la causa de fallos en una fuente de alimentación de una balanza comercial que se utiliza ampliamente en comercios de Argentina. Se realizó un análisis estadístico de las fallas y se identificó el sector de la fuente y los componentes que producían el fallo. A partir de la presencia de restos de cucarachas se planteó la hipótesis que fueran éstas quienes producían los fallos. Dado que el objetivo de la investigación no era solo descubrir la causa de la falla sino también encontrar una solución rentable, se llevaron a cabo una serie de experimentos que en primera instancia confirmaron la hipótesis y luego el estudio de los hábitos de las cucarachas y la observación de su comportamiento en presencia de alta tensión, permitieron brindar una solución al problema.http://www.iua.edu.ar/uea2014/index.phpFil: Chesini, Ezequiel. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Bigliani, Juan Cruz. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Bigliani, Celeste. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Fil: Taborda, Ricardo A.M. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales; Argentina.Ingeniería Eléctrica y Electrónic

Anxiogenic-like effects of Uncaria tomentosa (Willd) DC aqueous extract in an elevated plus-maze test in mice: a preliminary study

The purpose of this study was to examine the effect of orally administered Uncaria tomentosa aqueous extracts (UTE) (Willd. ex Roem. & Schult.) DC. (Rubiaceae) during 7, 15, 30 and 90 days of treatment on the expression of anxiety, as expressed in the elevated plus maze test in male Albino Swiss mice. UTE revealed an anxiogenic effect in relation to the control group at 15 and 30 days, but it was reversed after 90 days of administration, without affecting the locomotor activity or any deleterious effects on the overall performance of the animal, either for its ambulation, or clinical status, and body weight and organ weight/body weight from liver, lung and kidney were unaffected. These biphasic effects are usually indicative of heterogeneity in sites of action due to the presence of many alkaloids (speciophylline, uncarine F and uncarine E) and flavanols (catechin and epigallocatechin) identified and isolated from UTE.Fil: Bigliani, María Celeste. Universidad Nacional de Cordoba. Facultad de Medicina. Departamento de Fisiologia Humana y Fisica Biomedica. Catedra de Fisiologia Humana; ArgentinaFil: Rosso, María Celeste. Universidad Nacional de la Rioja; ArgentinaFil: Zunino, María Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Córdoba. Instituto Multidisciplinario de Biología Vegetal (p); ArgentinaFil: Baiardi, Gustavo Carlos. Universidad Catolica de Cordoba. Facultad de Cs.quimicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Ponce, Andrés Alberto. Universidad Nacional de Cordoba. Facultad de Medicina. Departamento de Fisiologia Humana y Fisica Biomedica. Catedra de Fisiologia Humana; Argentina. Universidad Nacional de la Rioja; Argentin

Effects of Cecropia pachystachya and Larrea divaricata aqueous extracts in mice

Our studies were performed to investigate the effects of the aqueous extracts of Cecropia pachystachya and Larrea divaricata. These plants are used in folkloric medicine in infusion and were administered orally (0.76 g/kg) to male Albino Swiss mice for 16 days, on drink intake, organ weight/body weight (OW/BW × 100) ratio, histology, broqueoalveolar fluid (BALF) and elevated plus-maze (EPM). Feeding as well as body weight were unaffected by the consumption of these extracts. There were no signs of toxicity in BALF, morbidity or mortality during the study. C. pachystachya caused an increase in relative kidney OW/BW (p ≤.05 vs control). The macroscopic and microscopic morphologic analyses of the organs were not altered by administration of these plants. A non-anxiolytic-like activity of an aqueous extract prepared from the leaves of C. pachystachya and L. divaricata in EPM was observed. We conclude that the crude aqueous extracts of leaves tested on mice orally did not produce signs of toxicity or behavioral changes in routine histological and clinical evaluation. However, knowledge of the biological activity of many herbal medicine used in Latin American is still deficient and more studies will be needed to elucidate the possible toxic effects.Fil: Bigliani, María Celeste. Universidad Nacional de la Rioja. Departamento de Cs.de la Salud y Educacion; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Grondona, Ezequiel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Ciencias de la Salud. Universidad Nacional de Córdoba. Instituto de Investigaciones en Ciencias de la Salud; ArgentinaFil: Zunino, María Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Ponce, A. A.. Universidad Nacional de la Rioja. Departamento de Cs.de la Salud y Educacion; Argentin

Biphasic Modulation of Neutrophil Migration by Aqueous Extracts of Uncaria tomentosa in Murine Lung

In the history of medicine, the treatment of disease has been influenced by an intimate contact with nature. A mice model of lipopolysaccharide (LPS)-induced acute lung injury was used to evaluate the protective effects of long-term water-soluble administration ad libitum of Uncaria tomentosa extracts (20 gr/L; UTE) in lung inflammation. Swiss mice had LPS (1,67µg/ml) instilled intranasally 3hs before sacrificed, and were then pre-treated with UTE for 7, 15, 30 or 90 days or with a single dose of dexamethasone (2,5 mg/kg, DX). Inflammatory cell concentration was measured in the bronchoalveolar fluid (BALF) and histology was performed. No acute or chronic toxicity signs were observed in the clinical status. In addition, body weight, food consumption, organ weight, kidney, liver, and lung pathology were not found to be affected by the UTE treatments. UTE or DX significantly reduced the lung edema, exudation and lung injury histology for 7 and 90 day treatments. In addition, pre-treatment with UTE revealed a biphasic attenuated recruitment in BALF from neutrophils at 7 and 90 days induced by endotoxin exposure compared to the control (p<0.05). These data suggest that UTE initially induces a nonspecific response that is transient protection from PMNs migration into the lung mice.Fil: Roque, Noelia. Universidad Nacional de Córdoba; ArgentinaFil: Cremonezzi, David César. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Bigliani, María Celeste. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Grondona, Ezequiel. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zunino, María Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; ArgentinaFil: Ponce, Andrés Alberto. Universidad Nacional de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin