This article presents a proposal to address the negative attitudes towards science, through practical classroom work. This method is based on teaching kits developed by students and teachers within school science research aimed. The kits allow active processes to develop the teaching and learning process of science in a better way, fail to motivate students and improve their attitudes towards science, build explanatory models and conduct research without needing a laboratory or specialized materials. Teachers who participated in the implementation of the methodology appropriated this, they developed a positive attitude towards its use and conceived as a solution to address the lack of practical sessions in teaching science.

The growing demand for healthier lipid alternatives has driven interest in oleogels as promising substitutes for the conventional saturated and trans fats in foods systems. In this context, this study explores the formulation and characterization of oleogels based on avocado oil (Persea americana var. Lorena) and monoglycerides, as an alternative to conventional saturated fats. Hydraulic compression was used to extract the oil, and the formulation was optimized using a Box–Behnken experimental design, evaluating the effects of temperature (70–90 °C), monoglyceride concentration (4–8%), and heating time (15–45 min) on oil retention capacity (ORC) and firmness. Results showed that temperature and concentration significantly influenced ORC and firmness, while heating time had no relevant effect. The optimal formulation achieved 85.95% ORC, 1.09 N firmness, and superior oxidative stability (41.71 h vs. 10.80 h in pure oil, Rancimat test). The obtained oleogel exhibited good mechanical and thermal properties, with an elastic-dominant rheological profile and higher oxidation resistance compared to unmodified avocado oil. These findings indicate that the avocado oleogels structured with monoglycerides have potential applications in the food and cosmetic industries, although further improvements in structural stability are recommended to broaden their range of applications.

Este escrito sobre la tabla periódica busca ofrecer ideas para la celebración del Año Internacional de la Tabla Periódica propuesto por la UNESCO para este 2019 y apoyado por diferentes organizaciones a nivel internacional. Tales ideas giran alrededor de la consideración de que el lenguaje científico es el eje articular para enseñarla y aspiran a exponer los aportes de diferentes científicos para lograr lo que hoy conocemos como tabla periódica. Además, se hacen algunas propuestas metodológicas para celebrar este aniversario de forma colectiva o personal. © 2019. Acad. Colomb. Cienc. Ex. Fis. Nat.

This paper exposes a methodological approach that was designed and developed to facilitate the understanding of the topic chemical equilibrium; a familiar context for students was used. The proposal was applied to an average population of about 16- year-old. The context was the process used to produce yogurt in a lab under the methodological strategy: Teaching for Understanding (TfU). The proposal also relies on neuroscientifi c foundations of learning that take into account the need to generate attention statements prior academic work, to improve understanding of concepts and pitch them to the long-term memory by stimulating multisensorial; this stimulation may improve better synaptic connections. Before starting the academic work, stimulation activities were conducted, which resulted in a state of attention and motivation that allowed students to make observations and analysis at the macroscopic level, to fi nally understand precisely the chemical process lactic fermentation, as a reversible process produced by the action of microorganisms.