Discourse analysis of practicing chemistry teachers and its contribution to the assessment of scientific thinking competences. A case study in Chile)Under Fondecyt 1095149 project, the Teaching Reflection Workshop (TRD) on "Science communication in the classroom and promotion of Scientific Thinking Skills" (CPC) was designed and conducted with four chemistry teachers of Middle School. During the workshop, the teachers designed and planned teaching and learning sequences (SEA) for the chemical bond, emphasizing argumentation and explanation. The speeches of one of the two teachers who participated in the activity following the methodological guidelines by Boulter ( 2000) are characterized and analyzed in this paper. The results indicate that the use of different systemic patterns allows us to study the discourses that emerge in chemistry class and are means for explaining the world.
To recognise the importance of integrating metascientific discip lines in the teacher's thought is one of the aspects addressed for science education reasearchers. In this study we analyse different thought factors of a group of pre-service teachers in relation to the educational implications of including the history of chemistry in their teaching sequences. Through a progressive work we identify the concordances and discrepancies between their theoretical conceptions and the development of teaching materials of a sample of pre-service teachers. We've found evidences that despite the high recognition of the educational value of including the h istory of science, students have few resources to generate new proposals, either because of deficiencies in their training and the lack of materials of reference and non-traditional sources.
El uso de los mapas conceptuales por parte del profesorado puede dar lucesacerca de cómo está entendiendo y aprendiendo una determinada nocióncientífica escolar. Esta investigación se realiza en el marco de un proyecto, endonde el profesorado participante tiene la oportunidad de diseñar de maneracolaborativa, instrumentos didácticos para el enfrentamiento de obstáculos apartir de problemáticas emergentes e identificadas por los mismos. Porconsiguiente, tuvo como objetivo identificar procesos de entendimiento yaprendizaje estudiantiles acerca de la homeostasis, a través del diseño de mapasconceptuales en el aula de Biología en la Enseñanza Media, contribuyendo a laconstrucción de los perfiles conceptuales del estudiantado en lo que se refiere ala noción científica en estudio. Para esto, se hacen dos propuestas de análisis,una con categorías a priori, y la segunda con categorías emergentes. En el primeranálisis se pudo identificar la dificultad de uso de los mapas conceptuales por elestudiantado, además de un enfoque restricto y con errores conceptuales sobrela homeostasis. El segundo análisis identificó un cierto perfil de la noción dehomeostasis presentada por el estudiantado del curso estudiado, y su abordajedesde el modelo de Bernard, contradiciendo a lo propuesto por el docente, quees el modelo de Cannon.
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