BUSCADOR RECOLECTA

Los informantes enseñan algunos de los objetos tradicionales que almacenan en su casa., Os informantes mostram alguns dos objectos tradicionais que guardam em casa., Informants show some of the traditional objects they store at home.

Project developed by Christopher Absell (University Gothenburg and Instituto Figuerola) Giovanni Federico (New York University Dubai) and Antonio Tena Junguito (Universidad Carlos III de Madrid and Instituto Figuerola). Dataset: Serbia

Project developed by Christopher Absell (University Gothenburg and Instituto Figuerola) Giovanni Federico (New York University Dubai) and Antonio Tena Junguito (Universidad Carlos III de Madrid and Instituto Figuerola). Dataset: Belgium

Project developed by Giovanni Federico (Università di Pisa) and Antonio Tena Junguito (Universidad Carlos III de Madrid). This data base outlines changes in world trade from 1800 to 2016. Dataset: Belgian Congo (Zaire)

Project developed by Christopher Absell (University Gothenburg and Instituto Figuerola) Giovanni Federico (New York University Dubai) and Antonio Tena Junguito (Universidad Carlos III de Madrid and Instituto Figuerola). Dataset: Cuba

Currently, the preparation of high-quality graphene (G) dispersions is crucial due to the increasing demand for this nanomaterial in a wide range of industries. However, given the strong π–π stacking tendency between G sheets, dispersant agents such as surfactants or polymers are required to attain stable and homogenous dispersions in liquid media. In the present project, the effectiveness of resveratrol (RV), a fluorescent bioactive compound with antioxidant activity, as a dispersing agent for G in aqueous solutions was assessed. The interaction between G and RV was investigated via absorbance, fluorescence and Raman measurements. Dispersions were prepared via bath sonication, followed by probe ultrasonication and centrifugation, though the two last stages have little effect on the dispersion quality. The addition of G causes a quenching on RV fluorescence, and its magnitude raises with increasing G concentration, being the effect stronger up to 10 mg L-1. The change in the centrifugation speed and time have hardly influence on the RV fluorescence in the presence of G. The RV content remaining in the bulk solution after G dispersion, measured via UV–Vis absorption, decreases linearly with increasing G concentration. RV can effectively disperse all the G present in the sample up to 10 mg L-1; at higher concentrations, the dispersing ability slightly decreases, and the G content is distributed between the bulk solution and the centrifuged residue. Besides, the fluorescence of RV dispersed in G is much higher in methanol than in an aqueous medium. TEM analysis confirms the good exfoliation of G upon ultrasonication in RV solutions and indicates that the layer thickness depends on the G/RV ratio. The results of this study could open new perspectives for using natural products like resveratrol as biocompatible and efficient dispersing agents of G to be used in numerous applications, especially in biomedicine.

Project developed by Giovanni Federico (Università di Pisa) and Antonio Tena Junguito (Universidad Carlos III de Madrid). This data base outlines changes in world trade from 1800 to 2016. Dataset: Egypt

Project developed by Giovanni Federico (New York University Abu Dhabi) and Antonio Tena Junguito (Universidad Carlos III de Madrid). Dataset: Bolivia

Ha ido alternando a lo largo de los años el número de cada tipo de ganado, y también el uso (p. ej. las caballerías antes se usaban para trabajo, ahora para paseos). Denominaciones para animales, según sexo y edad., Ao longo dos anos, o número de cada tipo de gado tem alternado, assim como o uso (por exemplo, a cavalaria costumava ser usada para o trabalho, agora para caminhadas). Denominações para animais, de acordo com o sexo e a idade., Over the years, the number of each type of livestock has alternated, and so has the use (e.g. cavalry used to be used for work, now for walks). Denominations for animals, according to sex and age.

Entrevista a informante 1 en Laranjeiras. ¿Como era la vida en la infancia? Malas vías de comunicación y medios de transporte precarios. Juegos infantiles., Como era a vida na infância? Maus canais de comunicação e meios precários de transporte. Jogos Infantis., What was life like in childhood? Bad communication ways and precarious means of transport. Childish games.