En torno al origen de las imágenes de la sección de las veintenas en los "Primeros Memoriales" de fray Bernardino de Sahagún

By examining the pictorial content of the veintena section of the Primeros Memoriales, the manusctipt compiled by fray Bernardino de Sahagún, I identify new pieces of evidence on the origin of these illustrations and their authors. A carefull analisis of this material suggests that it is strongly embedded in the pre-Hispanic tradition and that it is doubtful that their iconographic sources originated in Tepeopolco, as it is widely believed.El objetivo de este trabajo es el análisis del contenido pictórico de la sección de las veintenas de los Primeros Memoriales, un manuscrito de fray Bernardino de Sahagún, para ver si a través del mismo es posible obtener nuevos datos sobre el origen de esas ilustraciones, así como de sus autores. El análisis cuidadoso de este material sugiere que su procedencia es prehispánica, y que no es cierto que las imágenes originales proporcionadas a Sahagún durante la creación del manuscrito procedieran de Tepepolco, tal como se consideraba hasta ahora

Membrane Systems for Biomedical Engineering

The thematic scope concerning membrane systems for biomedical engineering is very wide; it concerns new methods of designing membrane systems for biomedical and biomedical-related environmental processes [...

A Composite Membrane System with Gold Nanoparticles, Hydroxyapatite, and Fullerenol for Dual Interaction for Biomedical Purposes

Background: Wound dressing plays a vital role in post-operative aftercare. There is the necessity to develop dressings for application on the border of soft and hard tissue. This study aimed to develop multifunctional polyelectrolyte layers enhanced by hydroxyapatite nanoparticles, gold nanoparticles (AuNPs), and/or fullerenol nanocomposites to achieve a wound dressing that could be applied on the bone-skin interface. Methods: Constructed shells were examined using TEM, STEM, and EDX techniques. The human osteoblasts or fibroblasts were immobilized within the shells. The systems morphology was assessed using SEM. The functioning of cells was determined by flow cytomery. Moreover, the internalization of AuNPs was assessed. Results: Involvement of fullerenol and/or hydroxyapatite nanoparticles influenced the immobilized cell systems morphology. Membranes with fullerenol and hydroxyapatite nanoparticles were observed to block the internalization of AuNPs by immobilized hFOB cells. Conclusions: The designed bilayer membranes incorporating fullerenol, and bacteriostatic elements, prevented the internalization of AuNPs by hFOB cells and ensured the proper counts and morphology of eukaryotic cells. The developed material can be recommended for dressings at the bone-skin interface