Influence of Personality Types and Socio-Demographic Characteristics of Work-Study Students at a Private University, Southwest Nigeria

This study examined the influence of personality types and socio-demographic characteristics on work-study of students at Covenant University, Ota. The study used questionnaires to collect information from 100 students who participated in the programme in 2014/2015 academic session. The chi-x2 result of 12.30 for the variable responses showed that the age and the sex of students influenced their participation in work study programme with chi-x2 (29.80), degree of freedom 4 and significance level of 1 % of the combined result respectively. The finding of investigation also show that birth order influenced students participation in work study initiative with chi-x2 distribution of 19.70, degree of freedom of 4 and asymptotic significance of 1 %. Also, the result of the T-statistics (28.23) with the degree of freedom 99 revealed significance among the Personality Type “A” and “B” compositions at 1% level of significance. The estimated correlation coefficient indicates a significant strong correlation (0.630) between the response variables “Personality Type” and influence on student participation in work study programme. DOI: 10.5901/mjss.2015.v6n6s4p45

Comparative Microstructural study of Inconel 625 used to turbochargers

Inconel 625 alloy is a nickel-based superalloy that is widely used in important engineering applications, such as in the manufacture of specific parts for the turbine engines of some automobiles and aircraft [1]. These applications are due in part, to the fact that Inconel 625 resists temperatures ranging from cryogenic to temperatures approaching 1200°C [2], because of its matrix remaining austenitic (face-centered cubic structure which is the predominant phase in Ni base alloys) [3], from solidification to absolute zero, and its weld consumables which offer some properties in the weld state that no other family of superalloys can offer [4]

Uso de biomateriales funcionalizados con moléculas bioactivas en la ingeniería biomédica

El artículo expone la importancia del uso de moléculas bioactivas para la funcionalización de biomateriales. Por esta razón, se realizó una revisión de investigaciones actuales y relevantes en diversos buscadores de datos, incluyendo los diferentes tipos de materiales y moléculas bioactivas utilizadas para elaborar biomateriales funcionalizados, con énfasis en los procesos y sus propiedades. Se encontró que el proceso de funcionalización o modificación de la su- perficie expande el camino para adaptar al biomaterial de acuerdo al entorno fisiológico de las células vivas. De esta manera, el proceso mejora la estructura y las funciones de los tejidos y órganos diseñados. Existen una variedad de métodos y moléculas bioactivas disponibles para la funcionalización de los biomateriales, las cuales dependen de la manera en las que las células o tejidos se regeneran. Entre los diferentes materiales para la fabricación de bioma- teriales, las biomoléculas como las proteínas, lípidos, carbohidratos, entre otros, son una de las opciones más utili- zadas debido a la similitud de estas con los sistemas biológicos del cuerpo humano. Finalmente, el artículo también integra algunas de las más prometedoras aplicaciones de moléculas bioactivas incorporadas a los biomateriales

Estrategias familiares de vida y su relación con desnutrición en niños menores de dos años Family life strategies associated with malnutrition in children aged under two years

Objetivo. Identificar las estrategias familiares de vida asociadas con desnutrición en niños menores de dos años. Material y métodos. Estudio de casos y controles efectuado en 1998 en el municipio de Teolocholco, estado de Tlaxcala, México, para estudiar familias con niños de 6 a 23 meses de edad. La muestra estuvo conformada por 105 casos y 210 controles. Las estrategias familiares de vida se agruparon en cinco tipos: formación de la familia, obtención y organización de recursos familiares, colaboración intra o extrafamiliar y preservación de la vida. La desnutrición se identificó de acuerdo con la talla para la edad. Para el análisis de los datos se hizo estimación de razones de momios, con intervalos de confianza al 95% y se construyeron modelos de regresión logística no condicionada. Resultados. Se obtuvieron datos de 605 unidades familiares, 445 controles y 160 casos. El modelo predictivo estuvo integrado por la escolaridad de la madre, hacinamiento, intervalo entre nacimientos, ingreso per capita mensual y el tiempo destinado para actividades de crianza/cuidado de los niños. Conclusiones. Las estrategias familiares de vida son determinantes para la ocurrencia desnutrición. Las características de la vida familiar deben considerarse en programas dirigidos a abatir el padecimiento en este grupo.<br>Objective. To identify the role of family life strategies on malnutrition in children aged 6-23 months of age. Material and Methods. This case-control study was conducted in 1998 in the municipality of Teolocholco, State of Tlaxcala, Mexico, among families with children aged 6-23 months of age. The sample was conformed by 105 cases and 210 controls. Family life strategies were grouped into five types: family composition, means and distribution of family income, family and social networks, and life preservation strategies. Malnutrition was classified according to height for age. Data were analyzed using logistic regression to obtain odds ratios and 95% confidence intervals. Results. Data were collected from 605 families, for a total of 445 controls and 160 cases. The predictive model included mother's schooling, overcrowding, time elapsed between childbirths, per capita monthly income, and time devoted to child-rearing activities. Conclusions. Family life strategies determine children's nutritional status; understanding the influence of the family on the children's health status is necessary to develop effective programs aimed at improving the nutritional status of children

Estrategias familiares de vida y su relación con desnutrición en niños menores de dos años

Objetivo. Identificar las estrategias familiares de vida asociadas con desnutrición en niños menores de dos años. Material y métodos. Estudio de casos y controles efectuado en 1998 en el municipio de Teolocholco, estado de Tlaxcala, México, para estudiar familias con niños de 6 a 23 meses de edad. La muestra estuvo conformada por 105 casos y 210 controles. Las estrategias familiares de vida se agruparon en cinco tipos: formación de la familia, obtención y organización de recursos familiares, colaboración intra o extrafamiliar y preservación de la vida. La desnutrición se identificó de acuerdo con la talla para la edad. Para el análisis de los datos se hizo estimación de razones de momios, con intervalos de confianza al 95% y se construyeron modelos de regresión logística no condicionada. Resultados. Se obtuvieron datos de 605 unidades familiares, 445 controles y 160 casos. El modelo predictivo estuvo integrado por la escolaridad de la madre, hacinamiento, intervalo entre nacimientos, ingreso per capita mensual y el tiempo destinado para actividades de crianza/cuidado de los niños. Conclusiones. Las estrategias familiares de vida son determinantes para la ocurrencia desnutrición. Las características de la vida familiar deben considerarse en programas dirigidos a abatir el padecimiento en este grupo

Comparative Study of the Antibacterial, Biodegradable, and Biocompatibility Properties of Composite and Bi-Layer Films of Chitosan/Gelatin Coated with Silver Particles

The dressings are materials that can improve the wound-healing process in patients with medical issues. Polymeric films are frequently used as dressings with multiple biological properties. Chitosan and gelatin are the most used polymers in tissue regeneration processes. There are usually several configurations of films for dressings, among which the composite (mixture of two or more materials) and layered ones stand out (layers). This study analyzed the antibacterial, degradable, and biocompatible properties of chitosan and gelatin films in 2 configurations, composite and bilayer, composite. In addition, a silver coating was added to enhance the antibacterial properties of both configurations. After the study, it was found that the bilayer films have a higher antibacterial activity than the composite films, having inhibition halos between 23% and 78% in Gram-negative bacteria. In addition, the bilayer films increased the fibroblast cell proliferation process, reaching up to 192% cell viability after 48 h of incubation. On the other hand, composite films have greater stability since they are thicker, with 276 µm, 243.8 µm, and 239 µm compared to 236 µm, 233 µm, and 219 µm thick for bilayer films; and a low degradation rate compared to bilayer films

POLYESTYRENE AND LOW DENSITY POLYETHYLENE OREGANO´S ESSENTIAL OIL FUNCTIONALIZATION FOR POSSIBLE ANTIMICROBIAL ACTIVE PACKAGING APPLICATIONS

Low density polyethylene (LDPE) and polystyrene (PS) samples were functionalized with oregano´s essential oil (OEO) for possible antimicrobial packing applications. Different concentrations of OEO were used (0.5-1.5 % v/v). Polymers were UV light irradiated during 60 min to improve the OEO adhesion through the polar groups (COOH, OH or COO-) generation on their surface. The effect of OEO different concentration on their antimicrobial activity, mechanical properties and cytotoxicity of the functionalized polymers were analyzed. All functionalized samples showed antimicrobial activity against Gram positive and Gram negative bacteria and this activity increased with OEO concentration. The addition of OEO did not affect the LDPE mechanical properties. The flexural properties of PS were affected by the OEO highest concentration. A cytotoxic effect was found in samples with 1.0 % and 1.5% v/v OEO concentrations

Corrosion Behavior of Titanium Alloys (Ti CP2, Ti-6Al-2Sn-4Zr-2Mo, Ti-6Al-4V and Ti Beta-C) with Anodized and Exposed in NaCl and H₂SO₄ Solutions

Nowadays, different industries, such as the aerospace and biomedical industries, prefer using Ti alloys due to their excellent anti-corrosion properties and ability to generate a TiO2 oxide layer; this induces the use of anodization to increase the useful life of components. The aim of this work is to characterize the electrochemical effect of anodizing treatment on titanium alloys (Ti CP2, Ti-6Al-2Sn-4Zr-2Mo, Ti-6Al-4V, and Ti Beta-C) in NaOH and KOH at 1 M, applying a current density of 0.0025 A/cm2. The electrochemical techniques employed were electrochemical noise (EN) and electrochemical impedance spectroscopy (EIS), supported by ASTM G199 and ASTM G106 in electrolytes of NaCl and H2SO4 at 3.5 wt. % as a simulation of marine and industrial atmospheres. Also, the anodized transversal section and surface morphology were characterized by a scanning electron microscope (SEM). The results of both electrochemical techniques indicated that Ti-6Al-2Sn-4Zr-2Mo anodized in NaOH presented the best properties against corrosion, and the thickness of the oxide was the biggest