Understanding of Mendelian Inheritance Model after conventional teaching methods in Secondary Education students

Mostrar que una nueva propuesta de enseñanza produce mejores actitudes y aprendizajes en los alumnos requiere disponer de un análisis de lo que se hace y se consigue con la enseñanza habitual. Para realizar dicho análisis se ha efectuado un estudio histórico y epistemológico de la evolución de las ideas en genética clásica, identificando los problemas que están en su origen, las ideas que permitieron avanzar y los obstáculos que hubo que superar. Como resultado de dicho estudio se han seleccionado un conjunto de indicadores de aprendizaje que deberían manifestarse en aquellas personas que hubieran comprendido los aspectos esenciales del modelo de herencia mendeliana, que se imparte en 4º de ESO. Dichos indicadores se han utilizado para analizar el aprendizaje tras la enseñanza convencional del tema. En este trabajo se presentan los resultados obtenidos que muestran las deficiencias más comunes y justifican la necesidad de una propuesta diferente.Showing that a new approach produces better learning and attitudes in students requires to have an analysis of what is done and what is achieved with conventional teaching. In order to perform such analysis, a historical and epistemological study of the evolution of ideas in classical genetics has been made, identifying problems at their source, the ideas that allowed progress and the obstacles that had to be overcome. As a result of this study, we selected a set of indicators of learning that should manifest themselves in those people who have understood the essential aspects of Mendelian inheritance model, which is taught in 4th of E.S.O. These indicators have been used to analyze the learning after conventional teaching of the subject. In this paper we present the results that show the most common deficiencies and justify the need for a different approach

Impact of Energy Losses Due to Failures on Photovoltaic Plant Energy Balance

Photovoltaic (PV) plant failures have a significant influence on PV plant security, reliability, and energy balance. Energy losses produced by a PV plant are due to two large causes: failures and inefficiencies. Knowing the relative influence of energy losses due to failures and energy losses due to inefficiencies on the PV plant energy balance contribute to the optimization of its design, commissioning, and maintenance tasks. This paper estimates the failure rates, grouped by components, and the relative impact of the failures on the PV plant energy balance through real operation and maintenance follow-up data of 15 PV plants in Spain and Italy for 15 months. Results show that the influence of failures in energy losses of all analysed PV plants is low, reaching a maximum value of 0.96% of the net energy yield. Solar field energy losses only represent 4.26% of all failure energy losses. On the other hand, energy losses due to inefficiencies have represented between 22.34% and 27.58% of the net energy yield

Proyecto Carteia: primeros resultados

En el presente artículo presentamos los primeros resultados del proyecto de investigación "estudio histórico arqueológico de la ciudad púnico romana de Carteia" desarrollados durante las campañas de 1994 y 1995. En el se aborda, de forma general, el desarrollo histórico y urbanístico de la ciudad desde sus primeras etapas históricas hasta la edad media profundizando en el estudio del desarrollo urbanístico, de su arquitectura y de sus fases constructivas, así como del conjunto de sus materiales arqueológicos. Las actuaciones de estas dos primeras campañas se han centrado en tres sectores del yacimiento que corresponden a tres problemas arqueológicos distintos: el estudio de la secuencia estratigráfica desde los primeros niveles de habitación de la ciudad púnica intrapuesta al foro ; los análisis de la estructura del complejo monumental del templo y, por último, el estudio del periodo medieval

Magneto-structural correlations in a family of ReIVCuII chains based on the hexachlororhenate(IV) metalloligand

Six novel one-dimensional chloro-bridged ReIVCuII complexes of formula {[Cu(L)4][ReCl6]}n are characterised structurally, magnetically and theoretically.</p

Magneto-structural correlations in dirhenium(IV) complexes possessing magnetic pathways with even or odd numbers of atoms.

Spin-polarization enforces either ferro- or antiferromagnetic exchange interactions between ReIV ions with odd or even numbers of intervening atoms.</p

Occular complications following dental local anesthesia

Objective: To determine the frequencyof appearance and the factors most commonlyassociated with ocular complications following dental local anesthesia, also establishing the location and type of anesthesia used. StudyDesign: An indexed search in the Pubmed and Compludoc databases was carried out with the keywords "oral anesthesia", "ocular", "ophthalmologic", "damage", "complications", "injection". We established a limitation that the literature had to have been published after the year 1970. A total of 19 articles were obtained, forming a total sample of 37 patients. The patient's sex, age, nerve anesthetized, type of anesthetic used, ophthalmological complication present, recoverytime, treatment and side effects were analyzed. Results: There is a higher involvement of females (77%). The average age was 34.2 years. There was no preference for an anesthetic technique. Diplopia was the most common complication (65%), which coincides with the data fromother authors. Almost all of the complications were of a temporarynature, with an average recoverytime of 68 minutes. Conclusions: This is one of the few studies of its kind in dental literature, it thus being difficult to make precise conclusions. Ophthalmological complications are seldoma problem, diplopia being the most common among them. The authors appear to indicate an intravascular injection of the anesthetic as the cause of the problem, and therefore, it should be avoided in order to prevent accidents at the ocular level. © Medicina Oral