11 research outputs found

    Análisis de los procesos atributivos que se generan en estudiantes de secundaria: el caso de Chile

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    Aplicando el cuestionario Sidney Attribution Scale (SAS), adaptado en Chile, y la teoría de atribuciones, fue posible testear 411 estudiantes distribuidos en 12 diferentes niveles de escolaridad, en la ciudad capital de la Octava Región del país y que se caracterizan por su dependencia administrativa. Este cuestionario permite indagar las causas a las cuales los estudiantes atribuyen su logro en los procesos de aprendizaje que se generan en clases de matemáticas, teniendo en consideración las variables éxito y fracaso con sus diferentes interpretaciones: habilidad, esfuerzo, dificultad de la tarea y factores externos

    Evaluation and comparison of the efficiency of two incubation systems for Genypterus chilensis (Guichenot, 1848) eggs

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    Indexación: Web of Science; ScieloActualmente la tendencia de la acuicultura mundial está orientada hacia la diversificación de los cultivos, principalmente de especies nativas. El congrio colorado Genypterus chilensis es un pez nativo de alta demanda gastronómica y explotación estacional que lo proyecta como candidato para el desarrollo de su tecnología de cultivo. El objetivo de este trabajo fue evaluar la eficiencia de dos sistemas de incubación de masas de huevos de G. chilensis, uno con circuito cerrado de agua (SICC) y el otro con circuito abierto (SICA); su eficiencia fue medida por el porcentaje de eclosión de huevos. Dos ensayos fueron realizados midiendo y comparando los porcentajes de fecundación y eclosión de huevos en cuatro réplicas entre los dos sistemas, encontrándose solo diferencias significativas entre los porcentajes de fecundación del bioensayo 2. El bioensayo 1 tuvo un 81% promedio de fecundación de los huevos y el porcentaje promedio de eclosión para el SICC fue 42,9 ± 34,5% y para el SICA fue 0,0 ± 0,0%. El bioensayo 2 tuvo un porcentaje promedio de fecundación de los huevos de 87,3 ± 2,6% para el SICC y 79,8 ± 3,2% para el SICA y el porcentaje promedio de eclosión para el SICC fue 27,9 ± 33,7% y para el SICA fue 4,8 ± 5,6%. Se discuten los parámetros de incubación para obtener una máxima eclosión y se entrega una proposición para mejorar el sistema SICC. El sistema de incubación con circuito cerrado de agua generó mayores sobrevivencias en los huevos de G. chilensis.The current trend in world aquaculture is towards the diversification of cultures, mainly native species. The red cusk eel Genypterus chilensis is a native Chilean species of high gastronomic demand and seasonal exploitation that is projected as a candidate for the development of farming technology. The objective of this study was to test the efficiency of two incubation systems for G. chilensis egg masses, one with a closed water circuit (SICC) and the other with an open water circuit (SICA). Efficiency was measured by the percentage of eggs hatched. Two assays were performed, measuring and comparing the percentages of egg fecundation and hatching in four replicates between the two incubation systems. Significant differences were only found between the percentages of fecundation of bioassay 2. On average, in bioassay 1, egg fecundation reached 81%, and the average of hatching for the SICC was 42.9 ± 34.5% and for the SICA was 0.0 ± 0.0%. Bioassay 2 had an average fecundation of 87.3 ± 2.6% for the SICC and 79.8 ± 3.2% for the SICA, and the average for hatching was 27.9 ± 33.7% for the SICC and 4.8 ± 5.6% for the SICA. Incubation parameters for maximum hatching were discussed and a proposal was made for improving the SICC system. The incubation system with a closed water circuit generated greater survival of G. chilensis eggs.http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2012000100018&nrm=is

    Utilidad del uso de acelerometría en la valoración del riesgo de caida en adultos mayores autovalentes que residen en la comunidad

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    Tesis (Kinesiólogo)La población de adultos mayores a nivel global crece a pasos acelerados. Las caídas son muy frecuentes en esta etapa del ciclo vital, las cuales suelen estar asociados a elevados riesgos de morbilidad y mortalidad, según datos de la Organización Mundial de Salud (OMS) “Cada año se producen aproximadamente un total de 37,3 millones de caídas a nivel global, de las cuales fallecen un total de 424.000 personas por la gravedad de las lesiones”. En Chile existen pruebas propuestas por el Ministerio de Salud (MINSAL), como la Estación Unipodal (EU) y el “Timed Up and Go” (TUG), usados para predecir los riesgos de caídas durante las actividades de la vida diaria, principalmente en la marcha. Estos carecen de exactitud y precisión si no se complementan con métodos de mayor especificidad y sensibilidad. La manera de determinar con mayor eficacia el riesgo de caída lo otorga la acelerometría, ya que estudia el comportamiento del centro de masa, el cual nos entrega información más relevante y objetiva acerca de la posibilidad de caer (a través de las mediciones de las variables de la marcha). Revisar la utilidad del estudio acelerométrico como complemento a la detección del riesgo de caídas en adultos mayores propuestos en las guías MINSAL. Se realizó una investigación de tipo revisión narrativa, en la cual se investigaron sólo los artículos científicos pertenecientes a las bases de datos como: la selección Mesh de Pubmed, Elsevier, Science Direct Cochrane Library. Se usaron las siguientes palabras claves: “adulto mayor” (“elderly”), “acelerometría” (“accelerometry”), “marcha” (“gait”), “caída” (“fall”), de los estudios que se encontraron en las distintas bases de datos se les aplicaron múltiples filtros para terminar finalmente hacer la selección de los documentos más adecuados para levantar la investigación. De 259 números de “papers” que se encontraron, se seleccionaron 23 documentos que cumplían con los criterios de inclusión y exclusión de esta investigación, los cuales abordan temas referentes sobre caídas en la población AM, el comportamiento del centro de masas durante la marcha y su evaluación mediante la acelerometría demostrando dicha evidencia de los estudios revisados que tiene una mayor especificidad y sensibilidad para este evento. Conclusión: Los resultados obtenidos de revisión bibliográfica mostraron que los parámetros acelerométricos del centro de masa de usuarios caedores y/o con alto riesgo de caídas tienen una clara tendencia a presentar valores menores en comparación con los de usuarios no caedores o con bajo riesgo de caídas en los AM.The global elder population is growing at a fast pace. Falls are very frequent at this stage of life, which are often associated with high morbidity and mortality risks. According to the World Health Organization (WHO). "Each year, approximately 37.3 million people fall worldwide, and a total of 424,000 people die due to the complexity of the injuries." In Chile, proofs have been shown by the Ministry of Health (MINSAL), such as the Unipodal [g1] Station (EU) and the Timed Up and Go (TUG), used to predict the risks of[g2] falls during daily life activities, mainly while walking. These two methods lack of accuracy and precision if they are not complemented by more specific and sensitive methods. The way most effective way to determine the risk of fall is by the accelerometry, since it studies the behavior of the center of mass, which provides us more relevant and objective information about the possibility of falling (through the measurements of the variables while walking), from the studies found in the different databases multiple filters are applied to finish making the selection of the most appropriate documents to lift the research. Objective/Goal: To review the utility of accelerometric studies as a complement to the detection of risk of falls in older adults proposed by the MINSAL guidelines. Method: A research through a narrative review was carried out, in which only the scientific articles belonging to databases such as Pubmed Mesh selection, Elsevier, Science Direct Cochrane Library were investigated. The following key words were used: “adulto mayor” (elderly), “acelerometría” (accelerometry), “marcha” (gait), “caída” (fall). From the studies that were found in the different data bases, multiple filters were applied to finally make the selection of the more suitable documents to carry the research. Outcomes: 23 out of 259 papers were selected which met the inclusion and exclusion criteria of this research, which address issues related to falls in the elder people population, the behavior of the center of mass while walking and its evaluation by accelerometry proving the evidence of the reviewed studies that are more specific and sensitive for this event. 5 Conclusion: The results obtained from a bibliographic review showed that the accelerometric parameters of the center of mass of users with high risk of falls have a clear tendency to present lower values compare to those of users without or with a low risk of falls in the elder peopl

    Reduced humoral response 3 months following BNT162b2 vaccination in SARS-CoV-2 uninfected residents of long-term care facilities

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    SARS-CoV-2 vaccination is the most effective strategy to protect older residents of long-term care facilities (LTCF) against severe COVID-19, but primary vaccine responses are less effective in older adults. Here, we characterised the humoral responses of institutionalised seniors 3 months after they had received the mRNA/BNT162b2 vaccine. plasma levels of SARS-CoV-2-specific total IgG, IgM and IgA antibodies were measured before and 3 months after vaccination in older residents of LTCF. Neutralisation capacity was assessed in a pseudovirus neutralisation assay against the original WH1 and later B.1.617.2/Delta variants. A group of younger adults was used as a reference group. three months after vaccination, uninfected older adults presented reduced SARS-CoV-2-specific IgG levels and a significantly lower neutralisation capacity against the WH1 and Delta variants compared with vaccinated uninfected younger individuals. In contrast, COVID-19-recovered older adults showed significantly higher SARS-CoV-2-specific IgG levels after vaccination than their younger counterparts, whereas showing similar neutralisation activity against the WH1 virus and an increased neutralisation capacity against the Delta variant. Although, similarly to younger individuals, previously infected older adults elicit potent cross-reactive immune responses, higher quantities of SARS-CoV-2-specific IgG antibodies are required to reach the same neutralisation levels. although hybrid immunity seems to be active in previously infected older adults 3 months after mRNA/BNT162b2 vaccination, humoral immune responses are diminished in COVID-19 uninfected but vaccinated older residents of LTCF. These results suggest that a vaccine booster dose should be prioritised for this particularly vulnerable population

    Two Year Cosmology Large Angular Scale Surveyor (CLASS) Observations: Long Timescale Stability Achieved with a Front-End Variable-delay Polarization Modulator at 40 GHz

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    The Cosmology Large Angular Scale Surveyor (CLASS) is a four-telescope array observing the largest angular scales (22002 \lesssim \ell \lesssim 200) of the cosmic microwave background (CMB) polarization. These scales encode information about reionization and inflation during the early universe. The instrument stability necessary to observe these angular scales from the ground is achieved through the use of a variable-delay polarization modulator (VPM) as the first optical element in each of the CLASS telescopes. Here we develop a demodulation scheme used to extract the polarization timestreams from the CLASS data and apply this method to selected data from the first two years of observations by the 40 GHz CLASS telescope. These timestreams are used to measure the 1/f1/f noise and temperature-to-polarization (TPT\rightarrow P) leakage present in the CLASS data. We find a median knee frequency for the pair-differenced demodulated linear polarization of 15.12 mHz and a TPT\rightarrow P leakage of <3.8×104<3.8\times10^{-4} (95\% confidence) across the focal plane. We examine the sources of 1/f1/f noise present in the data and find the component of 1/f1/f due to atmospheric precipitable water vapor (PWV) has an amplitude of 203±12μKRJs203 \pm 12 \mathrm{\mu K_{RJ}\sqrt{s}} for 1 mm of PWV when evaluated at 10 mHz; accounting for 32%\sim32\% of the 1/f1/f noise in the central pixels of the focal plane. The low level of TPT\rightarrow P leakage and 1/f1/f noise achieved through the use of a front-end polarization modulator enables the observation of the largest scales of the CMB polarization from the ground by the CLASS telescopes.Comment: Submitted to Ap

    Etnografía para marcas y nuevos negocios.

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    Ficha • Reynolds, Marcela (2011). Etnografía para marcas y nuevos negocios. La Crujía Ediciones. Colección: ICRJ APERO. Buenos Aires/Argentina: 94 pp

    Evaluación y comparación de la eficiencia de dos sistemas de incubación de huevos de Genypterus chilensis (Guichenot, 1848) Evaluation and comparison of the efficiency of two incubation systems for Genypterus chilensis (Guichenot, 1848) eggs

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    Actualmente la tendencia de la acuicultura mundial está orientada hacia la diversificación de los cultivos, principalmente de especies nativas. El congrio colorado Genypterus chilensis es un pez nativo de alta demanda gastronómica y explotación estacional que lo proyecta como candidato para el desarrollo de su tecnología de cultivo. El objetivo de este trabajo fue evaluar la eficiencia de dos sistemas de incubación de masas de huevos de G. chilensis, uno con circuito cerrado de agua (SICC) y el otro con circuito abierto (SICA); su eficiencia fue medida por el porcentaje de eclosión de huevos. Dos ensayos fueron realizados midiendo y comparando los porcentajes de fecundación y eclosión de huevos en cuatro réplicas entre los dos sistemas, encontrándose solo diferencias significativas entre los porcentajes de fecundación del bioensayo 2. El bioensayo 1 tuvo un 81% promedio de fecundación de los huevos y el porcentaje promedio de eclosión para el SICC fue 42,9 ± 34,5% y para el SICA fue 0,0 ± 0,0%. El bioensayo 2 tuvo un porcentaje promedio de fecundación de los huevos de 87,3 ± 2,6% para el SICC y 79,8 ± 3,2% para el SICA y el porcentaje promedio de eclosión para el SICC fue 27,9 ± 33,7% y para el SICA fue 4,8 ± 5,6%. Se discuten los parámetros de incubación para obtener una máxima eclosión y se entrega una proposición para mejorar el sistema SICC. El sistema de incubación con circuito cerrado de agua generó mayores sobrevivencias en los huevos de G. chilensis.The current trend in world aquaculture is towards the diversification of cultures, mainly native species. The red cusk eel Genypterus chilensis is a native Chilean species of high gastronomic demand and seasonal exploitation that is projected as a candidate for the development of farming technology. The objective of this study was to test the efficiency of two incubation systems for G. chilensis egg masses, one with a closed water circuit (SICC) and the other with an open water circuit (SICA). Efficiency was measured by the percentage of eggs hatched. Two assays were performed, measuring and comparing the percentages of egg fecundation and hatching in four replicates between the two incubation systems. Significant differences were only found between the percentages of fecundation of bioassay 2. On average, in bioassay 1, egg fecundation reached 81%, and the average of hatching for the SICC was 42.9 ± 34.5% and for the SICA was 0.0 ± 0.0%. Bioassay 2 had an average fecundation of 87.3 ± 2.6% for the SICC and 79.8 ± 3.2% for the SICA, and the average for hatching was 27.9 ± 33.7% for the SICC and 4.8 ± 5.6% for the SICA. Incubation parameters for maximum hatching were discussed and a proposal was made for improving the SICC system. The incubation system with a closed water circuit generated greater survival of G. chilensis eggs

    Evaluation and comparison of the efficiency of two incubation systems for Genypterus chilensis (Guichenot, 1848) eggs

    No full text
    The current trend in world aquaculture is towards the diversification of cultures, mainly native species. The red cusk eel Genypterus chilensis is a native Chilean species of high gastronomic demand and seasonal exploitation that is projected as a candidate for the development of farming technology. The objective of this study was to test the efficiency of two incubation systems for G. chilensis egg masses, one with a closed water circuit (SICC) and the other with an open water circuit (SICA). Efficiency was measured by the percentage of eggs hatched. Two assays were performed, measuring and comparing the percentages of egg fecundation and hatching in four replicates between the two incubation systems. Significant differences were only found between the percentages of fecundation of bioassay 2. On average, in bioassay 1, egg fecundation reached 81%, and the average of hatching for the SICC was 42.9 +/- 34.5% and for the SICA was 0.0 +/- 0.0%. Bioassay 2 had an average fecundation of 87.3 +/- 2.6% for the SICC and 79.8 +/- 3.2% for the SICA, and the average for hatching was 27.9 +/- 33.7% for the SICC and 4.8 +/- 5.6% for the SICA. Incubation parameters for maximum hatching were discussed and a proposal was made for improving the SICC system. The incubation system with a closed water circuit generated greater survival of G. chilensis eggs
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