Dental caries is one of the most prevalent chronic illnesses in early childhood, with repercussions on minors' quality of life. This vital stage constitutes an opportunity for children to acquire oral hygiene habits and control over them, especially in social vulnerability contexts. Objective: To analyze parents' beliefs about their ability to support their children in developing dental hygiene habits and children's beliefs about the acquisition of these habits before and after completing a dental hygiene development program. We established a quasi-experimental design with pre-test and post-test for two groups: parents and their preschool-age children participating in an educational program focused on developing dental hygiene habits in Mexico. We compared the habits, self-efficacy, intention and control on oral hygiene, through a paired t-test analysis. Results: The findings showed that...

Agradecemos a los curadores de todos los herbarios que hemos consultado durante esta investigación. Un agradecimiento muy especial para Sandra Knapp, Ana C. Ibañez, Andrea Cocucci, por el apoyo y buena disposición durante el trabajo de campo. PG agradece a Eduardo Navarro, Helen Castillo, Susy Castillo, Marco Cueva, Huber Trinidad, Roxana Castañeda y Rocío Deanna por poner a disposición sus colecciones de Salpichroa. Este trabajo fue posible gracias a la financiación recibida de Secyt-UNC, CONICET, MINCyT de Argentina y CONCYTEC de Perú en el marco del Acuerdo de Cooperación Científica y Tecnológica del Proyecto de Investigación Binacional entre Perú y Argentina, a quienes expresamos nuestro reconocimiento.

Sonochemical synthesis of monodisperse nickel nanoparticles (Ni-NPs) by reduction of Ni acetylacetonate in the presence of polyvinylpyrrolidone stabilizer is reported. The Ni-NPs size is readily controlled to 5 nanometer diameter with a standard deviation of less than 5%. The as-prepared Ni-NPs sample was dispersed in acetone, for 4 weeks. For structural analysis was not applied to a magnetic field or heat treatment as key methods to direct the assembly. The transition from separate Ni-NPs into self-organization of three dimensions (3D) superstructures was studied by electron microscopy. Experimental analysis suggests that the translation and rotation movement of the Ni-NPs are governed by magnetic frustration which promotes the formation of different geometric arrangements in two dimensions (2D). The formation of 3D superstructures is confirmed from scanning electron microscopy revealin...