RESUMEN
As in our everyday lives, we use digital elements as part of formal and informal education. To serve their educational purpose well, systematic research is desirable to identify and measure their characteristics. This study focuses on science practicals, which are complex and vary in organizational settings and specific arrangements, including usage of digital elements. We describe the digital resources on which the online instruction of science practicals during the COVID-19 forced lockdowns was built, and their key characteristics were identified. Data were collected from science teachers in Slovakia, Czechia, Slovenia, France, and Spain. The teachers shared the web resources they used and that they would recommend, together with a description of the resources. We recorded 89 inputs representing 50 unique resources. Teachers preferred free resources, mostly for knowledge revision, and newly discovered 36% of them due to forced distant teaching. The best evaluated resources were those supporting interaction (especially among peers), focused on teaching subjects and/or ICT, ready to use, and with a clear structure. The resource most frequently mentioned and used in more than half of the countries was PhET (Interactive Simulations for Science and Math) which provides free simulations of scientific principles. Other characteristics mentioned in the literature (e.g., supporting creativity and independent solving, connecting different levels of organization, authenticity, flexibility) were not that important for the overall rating.
Asunto(s)
Educación a Distancia , Personal Docente , Humanos , Escolaridad , Creatividad , FranciaRESUMEN
We present the histopathological findings of a naturally mummified eye from the Peruvian Lambayeque culture (900-1,200 AD), in which rehydration, light microscopy, and scanning electron microscopy allowed a detailed analysis of several eye tissues including the eyelids, sclera, and optic nerve, the latter showing evidence of hemorrhage likely related to the documented strangulation as the cause of death. We conclude that histopathological analysis of rehydrated mummified tissues can provide valuable information from fragile eye structures including the optic nerve, and these findings can be useful from a forensic point of view.
Asunto(s)
Asfixia/historia , Conducta Ceremonial , Ojo/patología , Momias/patología , Nervio Óptico/patología , Asfixia/patología , Ojo/ultraestructura , Femenino , Medicina Legal , Historia Medieval , Humanos , Microscopía Electrónica de Rastreo , Nervio Óptico/ultraestructura , PerúRESUMEN
OBJECTIVES: Mummified nervous tissue is very rarely found in ancient remains and usually corresponds to corpses which were frozen or preserved in bogs, conditions which limit tissue autolysis and bacterial degradation. Here, we show the unusual finding of spontaneously mummified brain tissue from several individuals from the little known megalithic talaiotic culture of the island of Minorca, dating approximately 3,000 years before present and corresponding to the late Mediterranean Bronze Age. METHODS: These individuals were part of an intact burial site containing 66 subjects. Intracraneal samples were carefully rehydrated with Sandison's solution. We used classical histochemical as well as 2D and 3D (scanning) electron-microscopic techniques. RESULTS: We provide evidence of the nervous nature of the samples as well as a detailed description of the morphological features of these ancient tissues. The intracranial material consisted of well-preserved eosinophilic reticular tissue and, although mostly absent, some exceptional pigment-containing neurons were identified. CONCLUSIONS: We present a detailed morphological analysis which can provide valuable information and guidelines for the interpretation of this scarce type of mummified samples and provide explanations for this surprising preservation.