7 resultados para poetas del 68

em Acceda, el repositorio institucional de la Universidad de Las Palmas de Gran Canaria. España


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[ES] El silenciamiento del gen reparador de mutaciones MLH1 por hipermetilación de su promotor es la principal causa de inestabilidad microsatélite (MSI) en tumores esporádicos tanto de origen colorectal (CC) como endometrial (CE). Los CC con MSI y MLH1 metilado ocurren en pacientes con más edad que los CC sin estas alteraciones moleculares. Sin embargo, en CE esta relación es controvertida. En este trabajo hemos estudiado la relación entre la edad y el estado MSI y de metilación de MLH1, en una serie amplia de pacientes con CE. El MSI se estableció usando tres marcadores de inestabilidad (BAT-26, BAT-25 y APA3). Para determinar la hipermetilación del promotor MLH1 se usó el MS-SSCA (methylation-sensitive single-strand conformation analysis). El 20% de las muestras de CE eran MSI, y el 80% de estas tenían MLH1 metilado. La edad en el diagnóstico de las pacientes con tumores MSI fue significativamente más elevada que la de las pacientes con tumores que presentaban estabilidad de microsatélites (MSS). (edad±SD: 67.1±9.6 años vs 63.4±10.0 años, p=0,034, test de Fisher). Los tumores MSI con MLH1 metilado ocurrieron en pacientes de más edad que los que presentan MLH1 no metilado o MSS. (68.5±9.5 años vs 61.4±8.0 años vs 63.4 ± 10.0 años, respectivamente, p=0,008, test de Chi-cuadrado). Estos resultados sugieren la existencia de diferencias epidemiológicas en pacientes con CE con diferentes estados de inestabilidad de microsatélites y de metilación del promotor MLH1.

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[EN] Diatom cell quantity and their biochemical composition vary among species and are greatly affected by harvest stage or culture conditions. Biometric parameters, growth, attachment capacity and variations in biochemical composition of four species of benthic diatoms (Amphora sp., Navicula incerta, Nitzschia sp. and Proschkinia sp.) were studied. For biochemical analysis the diatoms were harvested at different stages, in log and stationary phase of growth. The culture conditions were identical for all the experiments, benthic diatoms were cultured during 7 days in F/2 medium at 28.5 ± 1.4 ºC, at different original inoculating densities (50000, 100000, and 250000 cell mL-1), under continuous light of 5403 ± 649 Lux provided by cool white fluorescent lighting. The cultures were neither aerated nor agitated. These results show that the specific density of 10000 cell mL-1 was the best for weekly production: Proschkinia sp. reached the highest cell density of 5.81 x 106 cells mL-1 and Amphora sp. had the highest cell attachment capacity with 12000 cell mm-2, in stationary phase of growth. Protein and lipid content were higher in log phase than in stationary phase for the four diatoms. Amphora sp. in log phase of growth had the highest lipid content of 9.74% dry weight (DW). Polyunsaturated fatty acid (PUFA) content ranged from 23.25% to 38.62% of the total fatty acids (TFA), and the four diatoms tested were richer in n-3 PUFA than in n-6 PUFA. All the diatoms had significant quantities of 20:5n-3 (EPA) ranging between 12.69% and 17.68% of TFA. Benthic diatoms play an important and critical role in abalone culture as they are the principal food source of abalone post-larvae. Therefore, it is necessary to improve diatom quantity and quality to optimize post-larval nutrition and the consistency of production, resulting in an increase in growth and survival of abalones.

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Programa de doctorado: Nuevas perspectivas en cirugía. La fecha de publicación es la fecha de lectura