Desarrollo de actitudes hacia el cuidado de la energía : experiencia en la formación de maestros

To promote attitudes and actions towards energy conservation should be a basic goal in the science education. The present preliminary study attempts to evaluate the efficiency grade of a teaching proposal about energy saving carried out with preservice elementary teachers. Among the targets of this proposal we emphasize: 1) to enhance student's knowledge about energy, 2) that they become aware of the energy problem and 3) to develop positive attitudes towards energy conservation. The attitudes were evaluated administering a Likert-type eleven-item test before the teaching proposal and a post-test five months after it finished. The initial outcomes were compared with a similar research with Northamerican pupils. A statistically meaning change of attitudes towards energy conservation was obtained

Fossils of San Juan province

Se mencionan los principales fósiles que se hallan en el actual territorio de la provincia de San Juan, agrupados según las Eras Paleozoica, Mesozoica y Cenozoica. Se describen brevemente las características morfológicas de los fósiles más representativos, indicando su lugar de hallazgo, su edad y el ambiente sedimentario que lo caracteriza. También se definen y describen algunos conceptos y procesos geológicos utilizados en las ciencias paleontológicas.The main fossils of San Juan province are mentioned. They are grouped into the Paleozoic, Mesozoic and Cenozoic Eras. The morphological features of the most representative fossils are briefly described, with indication of their ages, localities and characteristic sedimentary environments. Also defined are some concepts and geological processes used in paleontological sciences.Fil: Bordonaro, Osvaldo Luis. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Provincia de Mendoza. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales. Universidad Nacional de Cuyo. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; ArgentinaFil: Raviolo, Mariana M.. No especifíca

Revisión estratigráfica y litofacial de la Formación La Silla (Ordovícico Inferior) en la Precordillera Oriental de San Juan, Argentina

La Formación La Silla (Cámbrico Superior - Ordovícico Inferior) fue definida en 1994 por Keller et al. a partir de los niveles inferiores de la Formación San Juan. Esta Formación consiste en una sucesión distintiva de calizas claras, con escasos fósiles y muy explotadas por su alta pureza. Basados en estudios detallados en la sección tipo cercana a Jáchal y siete secciones en el área sur cercana a la ciudad de San Juan, proponemos una subdivisión formal para la Formación La Silla en tres miembros. La división de la unidad está basada en la ubicación preferencial de bancos dolomíticos en el sector central de la Formación mientras que el sector superior e inferior son calizas monótonas. Los miembros se denominan, de base a techo: Miembro Río del Agua, Miembro Río Blanco y Miembro Río Salado (85, 140 y 81 m, respectivamente). Las dolomías en el Miembro Río Blanco son de dos tipos: macizas, potentes y generalmente asociadas a chert; y dolomías con laminación planar y/o entrecruzada, ambas fácilmente distinguibles a simple vista, otorgándole a este Miembro un aspecto bandeado debido a la alternancia entre calizas y dolomías. Esto contrasta con el aspecto macizo y monótono de los Miembros restantes con estratificación tabular y a veces suavemente ondulante. Se reconocen las facies de grainstone peloidal, grainstone oolítico, rudstone intraclástico, packstone peloidal, mudstone, microbiales laminadas y trombolíticas. Además se describen las nuevas facies de dolomías laminadas y dolomías macizas. De la misma manera que lo observado por Keller et al. (1994), la Formación La Silla representa una fase distinta en la sucesión cambro-ordovícica, con las dolomías perimareales de la Formación La Flecha por debajo y las calizas fosilíferas de plataforma abierta de la Formación San Juan por encima

Determinación y análisis del impacto de variables hidrogeológicas en conglomerado habitacional “La Favorita” Mendoza, Argentina

el objetivo de este trabajo fue, Identificar variables naturales y antrópicas que influyen en riesgos de desastre, elaborar cartografía en función de las variables detectadas y eventos posibles en zona, elaborar propuestas de acción y gestión para prevención, y Proponer planes de contingencias

Association of Autoimmunity to Autonomic Nervous Structures With Nerve Function in Patients With Type 1 Diabetes: A 16-Year Prospective Study

OBJECTIVE We prospectively evaluate the association between autoimmunity to autonomic nervous structures and autonomic neuropathy in type 1 diabetes in relation to clinical variables. RESEARCH DESIGN AND METHODS A cohort of 112 patients with type 1 diabetes was prospectively followed from adolescence (T0) to approximately 4 (T4) and 16 (T16) years later. Standard cardiovascular (CV) tests and neurological examination were performed and related to the presence of circulating antibodies (Ab) to autonomic nervous structures detected at T0 and T4. Quality of life was assessed by a diabetes-specific questionnaire. RESULTS Sixty-six patients (59% of the cohort) were re-examined at T16 (age 31.4 ± 2 years; disease duration 23.4 ± 3.7 years). Nineteen had circulating Ab to autonomic structures. Prevalence of abnormal tests and autonomic symptoms were higher in Ab-positive (68 and 26%, respectively) than Ab-negative (32 and 4%) patients ( P 1c increase). Presence of Ab carried over a 68% probability of developing an altered CV test; absence of Ab carried a 91% probability of not having an altered DB test and an 89% probability of not having an altered Valsalva ratio. Autonomic neuropathy was independently associated with worse quality of life. CONCLUSIONS Circulating Ab to autonomic structures are associated with the development of autonomic dysfunction in young diabetic patients independent of glycemic control

Trilobite-based biostratigraphic model (biofacies and biozonation) for the Middle Cambrian carbonate platform of the Argentine Precordillera

A preliminary biostratigraphic model that combines trilobite biofacies and biozonation is proposed for the early Marjumian (Middle Cambrian) of the Precordillera of western Argentina. This interval involves a variety of paleogeographic-paleoenvironmental settings across the carbonate platform, ranging from its interior to exterior areas beyond the platform margin and including both open-marine and near-shore environments. This model is based on three stratigraphic sections of the basal part of the Alojamiento Formation, which crops out in the Cordón del Alojamiento (Provincia de Mendoza) and Cordón de Santa Clara (Provincia de San Juan); and three sections of the Soldano Member of La Laja Formation in the Sierra Chica de Zonda (Provincia de San Juan).Three biofacies were recognized on the basis of trilobite associations that show a marked environmental distribution: 1) The Ptychagnostidae Biofacies is represented by an assemblage exclusively dominated by agnostoids, most of them belonging to Ptychagnostus; this assemblage occurs in mudstones and calcareous shales deposited below storm wave-base seaward of the platform margin; 2) the Peronopsidae Biofacies also developed in the external areas but it occurs in limestones deposited between fair-weather and storm wave-base; this assemblage is likewise dominated by agnostoids, but instead belonging to Peronopsis, with the rest of the fauna comprising polymeroids (Dolichometopidae, Oryctocephalidae, Zacanthoididae and Alokistocaridae); 3) the Alokistocaridae Biofacies occurs in grainstones, mudstones and calcareous shales deposited between fair-weather and storm wave-base under changeable conditions located near the platform margin and in the interior. It is dominated by alokistocarids whose relative abundance increases landward from 52% to 58% and to 95%. The remaining components belong to Dorypygidae, Zacanthoididae and Oryctocephalidae; Eodiscidae and Peronopsidae comprise minor proportions in the most seaward location. Due to the contrasting, environmentally mediated associations, these sections belong to three essentially synchronous biozones erected previously for the Middle Cambrian of western Laurentia, the Ptychagnostus gibbus, Oryctocephalus and Ehmaniella Biozones