El periodo universitario es una etapa de cambios educativos, sociales, familiares, alimentarios y emocionales. Los universitarios se encuentran en un periodo crítico para el desarrollo de estilos de vida que tienen mucha importancia en su futura salud, debido a que la influencia en el comportamiento alimentario de los compañeros, su situación económica y el gusto por cocinar hace que cambien sus hábitos de alimentación.Objetivo: Distinguir tipologías de los jóvenes universitarios en base a su nivel de satisfacción con la alimentación según los aspectos sociodemográficos, los hábitos y cultura alimentaria.Método: Se aplicó un cuestionario estructurado a una muestra de 500 estudiantes universitarios de la ciudad de Guayaquil. El instrumento de recogida de información fue tipo escala de Likert. Se consultaron los hábitos de consumo de alimentos dentro y fuera de la universidad, la edad, el peso y estatura aproximada y variables de clasificación sociodemográficas.Resultados: Mediante análisis factorial se distinguieron cuatro tipologías de estudiantes con diferencias significativas en los puntajes de la escala de satisfacción con la alimentación. Las tipologías difirieron en el número de personas afectadas por preferencia a cocinar, comer fuera de su casa, consumir comida precocinada, planificar su comida, vida social, tradición, conveniencia.Conclusión: La disponibilidad de los estudiantes para la preparación de su comida incide de forma directa proporcional a su satisfacción con los alimentos. Esto genera que la mayoría de los jóvenes desarrollen un adecuado hábito alimentario, dependiendo de su tiempo para la planificación de sus alimentos y la cocción de este.
At present, there are different treatments against cancer, however, some of them, such as chemotherapy, are very invasive for the human body, since they affect healthy tissues. Magnetic targeting of drugs by means of magnetic nanoparticles is one of the alternative techniques that has emerged in the last decade, it is based on the targeting of drug delivery to the tumor without affecting healthy tissues, via of injected nanoparticles with diamagnetic properties directly into the bloodstream, driven by external magnetic fields produced by permanent magnets. This technique in literature is often come upon as MTD for its acronym in English. In this work, a numerical model was developed in order to quantify the loss of nanoparticles in the process of interaction with the walls of the bloodstream. For this model, the Kinetic technique was used, quantifying the probability of adsorption and absorption taking into account the following parameters: diameter of the nanoparticle (200 nm), density of the nanoparticle (6450 kg · m
-3), diameter of the cell endothelial (0.1 μm - 1 μm), transcellular pores of the fenestrated endothelium (70 nm) and modulus of elasticity of the endothelium (4.1 ± 1.7 kPa).
A Fe32Cu64B4 (FeCuB) alloy was obtained by using an induction furnace under an argon atmosphere. Parameters suitable in the casting processes like voltage, temperature and cooling times were optimized. Once the FeCuB alloy was melted and solidified, X-ray diffraction (XRD) and surface morphology analysis were performed through optical and scanning electron microscopy (SEM-EDX). The results showed that complete diffusion of the precursor elements (Fe, Fe2B, Cu) requires thermal homogenization treatments (2 and 4 hours) at 750° as suggested from phase diagram of FeCuB simulation. The XRD analysis revealed that the primary crystallization consists of a mixture of the fcc-FeCuB (79%) and bcc-FeCuB (21%), with a = 3.62Å, spatial group Fm-3m and a = 2.86Å, spatial group Im-3m respectively. Micrographic images show an average grain distribution of ∼ 135µm. Finally, long times of homogenization (4 hours) allow a greater uniformity and redistribution of grain boundaries, resulting in the formation of an equiaxed grain structure in the alloy.
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