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artículo

Magnetic, structural and surface properties of functionalized maghemite nanoparticles for copper and lead adsorption

Publicado por
Guivar, JAR, Sadrollahi, E, Menzel, D, Fernandes, EGR, Loez, EO, Torres, MM, Arsuaga, JM, Arencibia, A, Litterst, FJ

Publicado 2017

Enlace

In this study, magnetic nanocomposites were developed and used as adsorbents for lead and copper from aqueous media. Structural, surface, magnetic and textural properties of functionalized maghemite nanoparticles synthesized by alkaline co-precipitation were studied. The surfaces of the iron oxide nanoparticles (Nps) were modified with different chemical agents such as fatty and amino acids, silica (SiO2), mesoporous silica (SBA-15), hydroxyapatite, multiwall carbon nanotubes (MWCNTs) and ethylenediaminetetraacetic acid (EDTA), obtaining NPs with mean particle sizes ranging from 7 to 16 nm according to Rietveld refinement and TEM images analysis. The physicochemical surface properties of the functionalized materials were studied via zeta potential (z) and Fourier transform infrared (FTIR) spectroscopy. Mossbauer spectroscopy (MS) as a function of temperature and DC magnetometry were ¨ u...

artículo

Gender associated with the intention to choose a medical specialty in medical students: A cross-sectional study in 11 countries in Latin America.

Publicado por
Ng-Sueng, L.F., Vargas-Matos, I., Mayta-Tristán, P., Pereyra-Elías, R., Montenegro-Idrogo, J.J., Inga-Berrospi, F., Ancalli, F., Bonilla-Escobar, F., Diáz-Vélez, C., Gutierrez-Quezada, E., Gómez-Alhach, J., Muñoz-Medina, C.E., Sanchez-Pozo, A., Vidal, M., Pozo, A.M.S., López, J.P.C., Panozo, S.L., Villar, R., Morales, R.S., Adauy, G.A., Toloza, P.A., de Aguilera Aedo, R.O., González, J.P.S., Brito, I.N., Avendaño, J.S., Romero, F., Alhach, J.G., Escobar, F.B., Calixto, O., Cardona, Á.M., Arias, J.L.O., Cifuentes, L.A., Acosta, K., Ospina, M., Ruíz, G.D.L., Cifuentes, A.F.Q., Ortega, I.B., Valverde, C., Fernández, J.B., Urrutia, L.E.C., Moya, G., Yescas, G., León, M.V., Gutiérrez, E., Peralta, R.M.I.A., Sulca, R.V., Urbina, J.A.G., León-Jiménez, F., Diaz, C., Cabrera-Enríquez, J., Berrospi, F.I., Muñoz, K.M., Loaiza, O.M., Torres, M.M., Figueroa, J.Á., Dextre, M.T., Purizaca-Rosillo, N., Vidal, O.R., Chambi, D.E.V., Alfonso, M., Castagnino, D.L., Mogollón, C.A., Maquera, J., Franco, M.J., Gómez, G.F., Castro, J.J., Vela, E.J.J., Sampé, M.O., García, G.R.V., Anaya, K.R.H., Calizaya, F.A., Lázaro, L.E.G., Medina, C.E.M., Rodríguez, M.A., da Silva-Abreu, A.

Publicado 2016

Enlace

Introduction: The selection of a medical specialty has been associated with multiple factors, such as personal preferences, academic exposure, motivational factors and sociodemographic factors, such as gender. The number of women in the medical field has increased in recent years. In Latin America, we have not found any studies that explore this relationship. Objective: To determine whether there is an association between gender and the intention to choose a medical specialty in medical students from 11 countries in Latin America. Methods: Secondary analysis of the Collaborative Working Group for the Research of Human Resources for Health (Red-LIRHUS) data; a multi-country project of students in their first year and fifth year of study, from 63 medical schools in 11 Latin American countries. All students who referred intention to choose a certain medical specialty were considered as part...