Abstract Nanocellulose (BNC) is a natural polymer produced by bacteria. Its structure has only glucose monomer, it has various properties such as high water holding capacity, unique nanostructure, high crystallinity and high mechanical strength. Pure BNC or in combination with different components can be used for a wide range of applications. Aloe vera is a medicinal plant with polysaccharides in its composition that has a potential for tissue regeneration and repair. The aim of this study was to evaluate the effect of incorporating Aloe vera (A. vera) into BNC membranes produced with three fractions of A. vera extract (BNC-Aloe) on the behavior of epithelial cells. Human fibroblasts and keratinocytes were shown to have increased metabolic activity and proliferation when cultured on BNC-Aloe membranes compared to control. Quantification of collagen biosynthesis was significantly higher in BNC-Aloe membranes. In conclusion, BNC-Aloe membranes are suggested as a material for the purpose of skin tissue repair.

The thematic approach supported by Paulo Freire’s reference has been the object of study in the Teaching of Nature Sciences. In this work we analyzed which knowledge is explained by two undergraduate students about limits and potentialities related to the planning and development of a thematic approach promoted in the context of a supervised curricular internship of a degree course in Chemistry. The examination of the knowledge of the graduates registered in a collective virtual diary was guided by assumptions from the perspective of the teacher as researcher of the practice itself and the procedures of discursive textual analysis. The analysis highlights that part of the knowledge explained by the undergraduates refers to the choice of topic and content of Chemistry to be addressed and the organization of classroom activities, which sometimes move away from a progressive perspective of education. Finally, it is pointed out that certain knowledge explained by the students as a potentiality in the thematic approach may keep in itself a certain limit that needs to be problematized, reinforcing to some extent the importance of the theoretical-methodological approach that guided the formative process.

Tissue Engineering aims to repair, regenerate or restore damaged tissues. Structures known as scaffolds can be manufactured in different ways and with various materials such as synthetic and natural polymers as well as inorganic materials. Additive Manufacturing (AM) has been used to produce porous scaffolds. Particularly, Selective Laser Sintering (SLS) produces materials and composites through a selective solidification of a variety of fine powders. AM-made biomaterials may be suitable for different affected or injured parts by stimulating the biological system around the implant. The present work aims to review relevant concepts concerning the nanostructure for regeneration of the bone tissue when in contact with the native tissue, as well as the suitable techniques and materials to fabricate it.