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Search Results: 1 - 10 of 2060 matches for " Cynthia Quinteros "
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Astronomy at school: present situation and future perspectives
Maria Iglesias,Cynthia Quinteros,Alejandro Gangui
Physics , 2008,
Abstract: Both the basic educational contents for students and study programs for science teachers include several topics in physics and astronomy, from the simplest ones to others as advanced as nuclear fusion to explain stellar evolution and space-time geometry for an approach to modern cosmology. In all these subjects, and most often in the simplest ones, alternative conceptions emerge, as both groups reach science course with preconstructed and consistent models of the universe surrounding them. In this work we present a series of basic questionings that make us reflect on the present situation of the teaching-learning relationship in astronomy within the framework of formal education. We then briefly explain our project aiming at finding the real learning situation of both students and prospective primary-school teachers in astronomical topics and, from the expected results of it, we point towards the need to develop didactic tools that could contribute to improve formal education in astronomy issues.
Situational diagnosis for preservice elementary teachers on some basic astronomical phenomena
Alejandro Gangui,Maria Iglesias,Cynthia Quinteros
Physics , 2008,
Abstract: The present situation of the teaching-learning relationship in astronomy is rarely investigated in our country. This is so, even when it is widely recognized that astronomy is an integral discipline, at the crossroads of advances in physics, geology, chemistry, etc. In this project we aim at contributing with the situational diagnosis in topics of astronomy of preservice elementary teachers, and to try and develop didactic tools that better collaborate with their formal education. We work with an open written questionnaire, designed to put in evidence some of the most frequently used models on a few basic astronomical notions. We here describe the main questions included in the test, and show our first results and some conclusions after having addressed the questionnaire to a number of preservice elementary teachers.
Some remarks on a current study involving preservice elementary teachers and some basic astronomical phenomena
Alejandro Gangui,Maria Iglesias,Cynthia Quinteros
Physics , 2010, DOI: 10.1017/S1743921311003164
Abstract: Recent studies have shown that not only primary school students but also their future teachers reach science courses with pre-constructed and consistent models of the world surrounding them. These ideas include many misconceptions which turn out to be robust and hence make difficult an appropriate teaching-learning process. We have designed some tools that proved helpful in putting in evidence some of the most frequently used alternative models on a few basic astronomical notions. We have tested these tools with preservice elementary teachers from various normal schools in Buenos Aires and made a first analysis of the results. The collection of data recovered so far shows that some non-scientific conceptions are indeed part of the prospective teachers' (scientific) background and that, therefore, the issue deserves special attention during their formal training.
Investigation carried out with pre-service elementary teachers on some basic astronomical topics
Alejandro Gangui,Maria Iglesias,Cynthia Quinteros
Physics , 2010,
Abstract: We perform a situational diagnosis in topics of astronomy of pre-service elementary teachers in order to try and develop didactic tools that better collaborate with their formal education. In this work we present the instrument we designed to put in evidence some of the most frequently used models on a few basic astronomical notions endowed by them. We work with an open written questionnaire comprising a limited but representative group of basic astronomical notions. We discuss the results of two first pilot tests, provided to 30 individuals, and we comment on the necessary changes applied to the instrument in order to design the final questionnaire, which was then provided to another group of 51 pre-service elementary teachers. A detailed qualitative analysis of the answers revealed many well-known alternative conceptions, and others that seem new. We find that prospective teachers have a hard time in trying to explain the movements of the Moon and its phases. They also meet difficulties to recognize and explain a couple of astronomical elements that make part of our ordinary language, like the origin of a shooting star and the real identity of the "lucero" (i.e., planet Venus). Amongst the answers offered to explain the causes of the seasons, we found a singular causality, which we think has not been sufficiently emphasized in the literature so far. Many of the inquired people did not advance an explicative model -a cause: say, the tilt of the Earth's axis- to justify a particular phenomenon -the effect: the seasons on the Earth-, but rather made use of another phenomenon/effect, in the present case related to the climate, in order to explain the seasons. However, as we know, this phenomenon/effect (the climate) has a strong astronomical component. We present here the full results of the first two tests and of the final instrument employed, and we draw some conclusions.
The movement of shadows: a teaching proposal for the secondary school
Alejandro Gangui,Maria Iglesias,Cynthia Quinteros
Physics , 2009,
Abstract: A didactic sequence of activities on some topics of Astronomy, related mainly with the length and orientation of shadows cast by a gnomon, the movement of shadows during daytime in different seasons of the year, and finding the true astronomical North, is fully developed. It also includes a discussion of observations from different frames of reference and of some topics in the history of science to enrich a debate among students, as well as the construction of a simplified model for the apparent displacement of the Sun, and of a sundial, and their use as resources to discuss some common misconceptions found in students. Multiple suggestions and clear guides are given for teachers of secondary education to implement theses activities in their classes.
Videos Etnográficos
Alonso Quinteros
Anthropologica , 2010,
Abstract: El artículo no presenta resumen
Lidocaine-Induced Cell Growth of Human Gingival Fibroblasts. Role of Na+-K+-ATPase and PKC Activities  [PDF]
Emmanuel Quinteros Villarruel, Betina Orman, Enri Borda
Pharmacology & Pharmacy (PP) , 2014, DOI: 10.4236/pp.2014.58090
Abstract:

Background: Evidences have shown that local anaesthetics are clinically useful compounds that exert a pharmacological effect by blocking nerve impulse propagation and also it is able to provoke proliferation and cell growth. Aims: The aim of this study was to investigate the proliferation and cell growth capacity of lidocaine on human gingival fibroblast cells and the different signal pathways involved in its effect. Method: For this purpose in vitro cultures of human gingival fibroblasts were assayed and the effects of lidocaine on proliferation and cell DNA synthesis, Na+-K+-ATPase and PKC activities and K+ efflux were also evaluated. Results: Lidocaine stimulated in a concentration-dependent manner proliferation and cell growth of human gingival cells and the mechanism involve an increment in Na+-K+-ATPase and PKC activities, which led to an increase in K+ release. All of these effects were blocked by tetrodotoxin, ouabain and calphostin C. In addition, PMA (activator of PKC)

Resenha de “La semántica argumentativa: una introducción a la teoría de los bloques semánticos” (Carel, (M.; Ducrot, O. – Buenos Aires: Colihue, 2006)
Susana Quinteros de Creus
Linguagem em (Dis)curso , 2007,
Abstract:
José Luis Moreno. Historia de la Familia en el Río de La Plata, Buenos Aires, Sudamericana, 2004, 316 p.
Guillermo Oscar Quinteros
Mundo agrario , 2004,
Abstract:
Explorando los símbolos del poder local. El pueblo y colonia Tornquist, 1880-1950
Guillermo O. Quinteros
Mundo agrario , 2002,
Abstract:
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