El Rábano (Raphanus sativus) es una especie de gran importancia por sus propiedades nutricionales, el alto porcentaje de aceite en sus semillas y la gran cantidad de metabolitos aprovechables. La producción de este cultivo se ve influenciada por factores como la utilización de semillas de alta o baja calidad. Es por esto que, en este estudio, se evaluó la aplicación del test de tetrazolio como método para determinar la viabilidad en semillas de Raphanus sativus. Inicialmente, se recolectaron semillas producidas en Villa del Rosario, Norte de Santander, Colombia, las cuales fueron expuestas a dos concentraciones (0,5 % y 1,0 %) y dos tiempos de exposición (24 y 48 horas). Posteriormente, fueron observadas en el estereoscopio para determinar el porcentaje de viabilidad, contabilizando las semillas que presentaron intensa coloración roja en su embrión; se obtuvieron un 99 % y 97 % de semillas viables con los tratamientos T2 (0,5 %, 24 h) y T4 (0,5 %, 48 h) respectivamente, no existiendo diferencias estadísticamente significativas entre sí (p ≤ 0,05: Tukey HSD). En comparación con la prueba de germinación, en la que se obtuvo un promedio de 99 %, no presentaron diferencias estadísticamente significativas los tratamientos T2, T3 y T4. Se concluyó con esto que la prueba de viabilidad con tetrazolio es efectiva a concentraciones de 0,5 % y 1,0 %, durante tiempos de exposición de 24 y 48 horas.
This study presents detailed thermodynamic modeling of a supercritical Brayton cycle operating with carbon dioxide as a working fluid for electric power generation. The study incorporates a main compression intercooling configuration while elucidating the effect of operational parameters on the overall performance based on energy and exergy perspectives. The model was carefully validated with relevant authors. Moreover, two different optimization methodologies, namely particle swarm optimization and fmincom, are evaluated based on convergence criteria. The results demonstrated that the fmincom reduced the iteration time between 140 s - 180 s. The cycle pressure played a central role in the stability of the thermophysical properties of the working fluid. The energy and exergy efficiencies present a direct relation with the inlet temperature. The air cooling and regenerators represent the biggest contributor to exergy destruction, whereas the compressors featured minimal impact on the exergy degeneration. Overall, the proposed configuration demonstrated robust performance to implement with high-grade heat sources, especially in non-interconnected areas.
The demand of medicinal plants for consumption is greatly increasing worldwide. The conventional breeding programs are generally dependent on the environment prone to biotic and abiotic stresses. These added to the low content of secondary metabolites at harvest, bring the need for artificial development of polyploid individuals as an alternative to increase productivity. Consequently, the present study evaluated the effect of different colchicine concentrations and exposure time, on Kalanchoe tubiflora leaf morphology and stomata. Initially, K. tubiflora seedlings were harvested and submitted to colchicine concentrations of 0, 0.025, 0.05 and 0.1 % and at two exposure times (24 and 48 hours). Subsequently, morphological measurements such as plant height, leaf width, leaves number, leaf length, leaf thickness and leaf volume every 15 days were made for 16 weeks after planting. Then, the stomata were characterized, taking into account the width, length, stomatal index and the number of chloroplasts per stoma. A significant increase in leaf morphology was found in colchicine treatments of 0.025 % at 48 h and 0.1 % at 24 h. A significant increase in stomatal morphology with the treatment of 0.025 % at 24 h was also recorded. This shows that the correct application of colchicine in term of quantity and time could produce greater growth in a short period and increase the biomass of K. tubiflora medicinal plant.
La investigación parte de un análisis documental con enfoque cualitativo. Su objetivo es diseñar la tendencia curricular para orientar cursos, módulos y asignaturas de los diferentes programas académicos de la universidad Francisco de Paula Santander ubicada en Cúcuta Colombia. La tendencia curricular validada se centra en el desarrollo de competencias y habilidades desde el enfoque dialógico crítico orientado a la formación en investigación e innovación apoyado en las tecnologías de la comunicación. En conclusion, la tendencia ha fomentado en estudiantes y profesores el desarrollo de habilidades de pensamiento formal, crítico, creatividad, generación de ideas para el emprendimiento, desarrollo de investigaciones desde tic, diseño y generación de prototipos para la innovación.
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