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This article presents the results of a piece of research that analyzed the views on the nature of science (NOS) among student teachers enrolled in programs of Primary Education at two public universities in Spain. Previous studies have reported that science teachers maintain ‘eclectic’ epistemological perspectives on science; in this article, we test if such a hypothesis holds when teachers’ NOS ideas are ‘anchored’ in specific periods and topics of the philosophy of science. We studied 114 prospective teachers attending an undergraduate teaching course with emphasis on the natural sciences at the Universities of Burgos and Valladolid in the period of 2017-18. A Likert-scale questionnaire with 50 items was applied to determine trends in those teachers’ epistemological views on science. The results showed that teachers’ views are mostly correlated with the philosophical period of Logical Positivism/Received View, and to some extent to the period of Recent and Contemporary Accounts. Regarding the classical epistemological topics of correspondence, methodologies, intervention, evolution and representation, teachers’ views could be related to the period of Logical Positivism/Received View and Critical Rationalism, but also to the New Philosophy of Science. The main conclusion of this study is that teachers’ expressed views on NOS are epistemologically eclectic to a much smaller degree when examined with more detail concerning specific periods and topics of the philosophy of science.

In this paper present a project that examines, analyzes, evaluates and reoriented, from critical and ongoing reflection, the processes of teaching and learning of chemistry as a science, considered as actors in the process: training teachers to hold the schools where develops the professional practice and teaching faculty researchers at the Universidad Distrital. An analysis of the school context in which teachers in training, used the development of teaching units as a strategy to address the concepts, theories or models of chemistry in different degrees and institutions where you did your teaching practice, these teaching units are directed from the problem-solving model, Se presenta un proyecto que estudia, analiza, evalúa y reorienta, desde la crítica y la reflexión permanente, los procesos de enseñanza y aprendizaje de la química como ciencia, considerando como actores del proceso los docentes en formación inicial, los dicentes de las instituciones donde se desarrolla la práctica profesional y los docentes investigadores de la Universidad Distrital. Se realiza un análisis del contexto escolar en donde los docentes en formación, utilizan la elaboración de unidades didácticas como estrategia para abordar los conceptos, teorías o modelos de la química en los diferentes grados e instituciones donde se realiza su práctica profesional docente; estas unidades didácticas se orientan desde el modelo de resolución de problemas

In this paper present a project that examines, analyzes, evaluates and reoriented, from critical and ongoing reflection, the processes of teaching and learning of chemistry as a science, considered as actors in the process: training teachers to hold the schools where develops the professional practice and teaching faculty researchers at the Universidad Distrital. An analysis of the school context in which teachers in training, used the development of teaching units as a strategy to address the concepts, theories or models of chemistry in different degrees and institutions where you did your teaching practice, these teaching units are directed from the problem-solving model., Se presenta un proyecto que estudia, analiza, evalúa y reorienta, desde la crítica y la reflexión permanente, los procesos de enseñanza y aprendizaje de la química como ciencia, considerando como actores del proceso los docentes en formación inicial, los dicentes de las instituciones donde se desarrolla la práctica profesional y los docentes investigadores de la Universidad Distrital. Se realiza un análisis del contexto escolar en donde los docentes en formación, utilizan la elaboración de unidades didácticas como estrategia para abordar los conceptos, teorías o modelos de la química en los diferentes grados e instituciones donde se realiza su práctica profesional docente; estas unidades didácticas se orientan desde el modelo de resolución de problemas.

A questionnaire in Spanish (with yes or no responses) was developed to study the effects of neurotoxic agents in various groups of Latin America are illiterate, the questions had to be read to the workers. Initially, the questionnaire contained 34 questions but was reduced to 16 after validating the questionnaire during a three week period; namely, if the questions were able to discriminate between groups of workers exposes to different neurotoxins (mercury, lead, organic solvents and organophosphates) and groups of non-exposed workers. A total of 851 male workers from both countries participated in the study. The questionnaire is recommended for monitoring workers exposed to neurotoxic agents., Un cuestionario en castellano (con opción de respuestas afirmativas o negativas) fué desarrollado, para estudiar los efectos de agentes neurotóxicos en varios grupos de trabajadores en Nicaragua y Venezuela. Como muchos trabajadores en América Latina son analfabetas, las preguntas tuvieron que ser leídas a los trabajadores. El cuestionario inicialmente contenía 34 preguntas, siendo reducido a 16 luego de estudiar si las preguntas eran reproducibles razonablemente en un período de tres semanas; si las preguntas discriminaban entre grupos expuestos a diferentes neurotóxicos (mercurio, plomo, solventes orgánicos y órganofosforados) y, además en grupos no expuestos. Un total 851 trabajad-res masculinos participaron en la evaluación en Nicaragua y Venezuela. El Cuestionario se recomienda para ser usado en el monitoreo de grupos expuestos a agentes neurotóxicos.