El número entero y el número racional.

Explicación matemática de las características de los números enteros y los números racionales, los elementos de las clases y las distintas propiedades de la adición y multiplicación de ambos tipos de números.

Evaluación y desarrollo de la creatividad.

Identificar alumnos precoces o de altas habilidades empleando diversos criterios de valoración. Diseñar y desarrollar un programa de mejora de la creatividad para alumnos de aulas ordinarias y evaluar su efecto. Muestra inicial formada por 1164 alumnos de Educación Infantil y Educación Primaria (601+563) de 5 y 6 años, escolarizados en 12 centros del municipio de Murcia. Para el segundo estudio (efectos del programa diseñado) se emplea una muestra reducida de 232 alumnos de infantil y primaria (127+105) de dos centros de la capital. El procedimiento abarca dos fases amplias, una primera en la que se aplican las pruebas e instrumentos a toda la muestra con el objetivo de identificar a los alumnos precoces y una segunda en la que se realiza un análisis intensivo de la creatividad y se evalúa la puesta en práctica de un programa de mejora de la misma dentro del aula ordinaria (con la muestra reducida) y con grupo experimental y de control. Test de Factor 'g' de Cattell y Cattell (nivel 1 TEA, 1983). Escala de valoración de alumnos precoces o de altas habilidades por sus profesores (inventario de elaboración propia de 24 items). Escala de valoración de padres (inventario de elaboración propia de 32 items). Nominación de los compañeros (12 cuestiones referidas a habilidades de niños precoces por las que se pregunta a los compañeros, de elaboración propia). Cuestionario de Creatividad GIFT1 (Group Inventory for Finding Creative Talent, n 1, de Rimn, 1976). Test de Pensamiento Creativo de Torrance (TTCT). Programa de Desarrollo de la Creatividad de Renzulli (1986). Estimación de las características psicométricas de los instrumentos de elaboración propia (fiabilidad y validez convergente. Medidas de consistencia de las puntuaciones obtenidas en las pruebas diseñadas. Diferencia de medias (pruebas 't'). Diseño cuasi-experimental con grupo de control no equivalente y medidas pre y postest. Paquete SPSS/PC ver. 10.1. Los resultados obtenidos cuando se analiza como característica diferencial de los alumnos precoces y/o de alta habilidad la creatividad, se aprecia claramente la tendencia de estos a ser más creativos, sobre todo por su interés en aprender y crear nuevas cosas, los datos de los estudios longitudinales sugieren que las prácticas educativas durante los años preescolares influyen en el potencial creativo que muestran los alumnos durante la adolescencia.

Algunas reflexiones sobre la formaci??n de profesores de educaci??n art??stica en la educaci??n secundaria

Resumen tomado de la publicaci??n

Borges, “Guayaquil” y la sombra del caudillo (Una historia de imprecisiones, silencios y davídicos coregas) [Estudios]

El autor revisa el cuento “Guayaquil”, de Jorge Luis Borges, incluido en El informe de Brodie, su motivo es la histórica reunión entre Bolívar y San Martín en dicha ciudad. Es interpretado a la luz de la novela Nostromo de Joseph Conrad, aludida en el relato, y que se refiere a los devaneos y traiciones de las élites criollas y sus caudillos. Robles sostiene que Borges presenta en “Guayaquil” su propia visión de la Historia: una construcción a base de perspectivas que se cruzan, de reordenamientos de datos y de imprecisiones, para Borges, en la lucha de poderes entre caudillos populares y refinados políticos pesarían más la voluntad y la decisión que las palabras. Finalmente, el autor revisa el efecto de una distinta organización de los cuentos del libro. El de la primera versión inglesa apuntaría a mostrar un ascenso en la representación de la barbarie (como tema de los textos), presente en las repúblicas latinoamericanas siglo y medio después de sus independencias.

Interaction of anthocyanins with human serum albumin: influence of pH and chemical structure on binding

The affinity of anthocyanins for human serum albumin (HSA) was determined by a fluorescence quenching method. The effects of pH and structure of anthocyanins on the binding constants were studied. The constants for binding of anthocyanins to HSA ranged from 1.08 x 10^5 M-1 to 13.16 x 10^5 M-1. A hydrophobic effect at acidic pH was shown by the relatively high positive entropy values under the conditions studied. Electrostatic interactions including hydrogen bonding contributed to the binding at pH 7.4. The effect of structure of anthocyanins on the affinity was pH dependent, particularly the effect of additional hydroxyl substituents. Hydroxyl substituents and glycosylation of anthocyanins decreased the affinity for binding to HSA at lower pH (especially pH 4), but increased the strength of binding at pH 7.4. In contrast, methylation of a hydroxyl group enhanced the binding at acidic pH, while this substitution reduced the strength of binding at pH 7.4. This paper has shown that changes in anthocyanin structure or reductions in pH, which may occur in the region of inflammatory sites, have an effect of the binding of anthocyanins to HSA.

The dependence of southern ocean meridional overturning on wind stress

An eddy-resolving numerical model of a zonal flow, meant to resemble the Antarctic Circumpolar Current, is described and analyzed using the framework of J. Marshall and T. Radko. In addition to wind and buoyancy forcing at the surface, the model contains a sponge layer at the northern boundary that permits a residual meridional overturning circulation (MOC) to exist at depth. The strength of the residual MOC is diagnosed for different strengths of surface wind stress. It is found that the eddy circulation largely compensates for the changes in Ekman circulation. The extent of the compensation and thus the sensitivity of the MOC to the winds depend on the surface boundary condition. A fixed-heat-flux surface boundary severely limits the ability of the MOC to change. An interactive heat flux leads to greater sensitivity. To explain the MOC sensitivity to the wind strength under the interactive heat flux, transformed Eulerian-mean theory is applied, in which the eddy diffusivity plays a central role in determining the eddy response. A scaling theory for the eddy diffusivity, based on the mechanical energy balance, is developed and tested; the average magnitude of the diffusivity is found to be proportional to the square root of the wind stress. The MOC sensitivity to the winds based on this scaling is compared with the true sensitivity diagnosed from the experiments.

Tackling drought stress: RECEPTOR-LIKE KINASES present new approaches

Global climate change and a growing population require tackling the reduction in arable land and improving biomass production and seed yield per area under varying conditions. One of these conditions is suboptimal water availability. Here, we review some of the classical approaches to dealing with plant response to drought stress and we evaluate how research on RECEPTOR-LIKE KINASES (RLKs) can contribute to improving plant performance under drought stress. RLKs are considered as key regulators of plant architecture and growth behavior, but they also function in defense and stress responses. The available literature and analyses of available transcript profiling data indeed suggest that RLKs can play an important role in optimizing plant responses to drought stress. In addition, RLK pathways are ideal targets for nontransgenic approaches, such as synthetic molecules, providing a novel strategy to manipulate their activity and supporting translational studies from model species, such as Arabidopsis thaliana, to economically useful crops.

The D2 antagonist sulpiride modulates the neural processing of both rewarding and aversive stimuli in healthy volunteers.

Rationale: Animal studies indicate that dopamine pathways in the ventral striatum code for the motivational salience of both rewarding and aversive stimuli, but evidence for this mechanism in humans is less established. We have developed a functional magnetic resonance imaging (fMRI) model which permits examination of the neural processing of both rewarding and aversive stimuli. Objectives: The aim of the study was to determine the effect of the dopamine receptor antagonist, sulpiride, on the neural processing of rewarding and aversive stimuli in healthy volunteers. Methods: We studied 30 healthy participants who were randomly allocated to receive a single dose of sulpiride (400 mg) or placebo, in a double-blind, parallel-group design. We used fMRI to measure the neural response to rewarding (taste or sight of chocolate) and aversive stimuli (sight of mouldy strawberries or unpleasant strawberry taste) 4 h after drug treatment. Results: Relative to placebo, sulpiride reduced blood oxygenation level-dependent responses to chocolate stimuli in the striatum (ventral striatum) and anterior cingulate cortex. Sulpiride also reduced lateral orbitofrontal cortex and insula activations to the taste and sight of the aversive condition. Conclusions: These results suggest that acute dopamine receptor blockade modulates mesolimbic and mesocortical neural activations in response to both rewarding and aversive stimuli in healthy volunteers. This effect may be relevant to the effects of dopamine receptor antagonists in the treatment of psychosis and may also have implications for the possible antidepressant properties of sulpiride.

Synthesis and structural characterization of a new polymeric zinc(II) complex with thiophene-2-carboxylic acid

A new polymeric zinc(II) complex with thiophene-2-carboxylic acid (-tpc) of composition [Zn2(C20H12O8S4)]n was obtained and structurally characterized by X-ray diffraction, thermal analysis, nuclear magnetic resonance (NMR), and infrared spectroscopies. Upfield shift in the 1H-NMR spectrum is explained by the crystalline structure, which shows the thiophene rings overlapping each other in parallel pairs. The compound crystallizes in the monoclinic system, space group P21/c, with a = 9.7074(4) angstrom, b = 13.5227(3) angstrom, c = 18.9735(7) angstrom, = 95.797(10)degrees, and Z = 4. Three -tpc groups bridge between two Zn(II) ions through oxygens and the fourth one bridges between one of these ions and the third one, symmetry related by a twofold screw axis. This arrangement gives rise to infinite chains along the crystallographic a direction. The metal atoms display an approximate tetrahedral configuration. The complex is insoluble in water, ethanol, and acetone, but soluble in dimethyl sulfoxide.

Individuell utprovning av inkontinenshjälpmedel i kommunala särskilda boenden

The purpose of this study was to examine the extent to which incontinence aids, used in local authority/municipal nursing homes, were adapted to the resident’s urine-leakage volume and to find out how nurses perceived the current situation concerning individual testing of incontinence aids in municipal nursing homes. The study method was a quantitative empirical study and was carried out in two phases. The first phase was a weighing test, carried out in three nursing homes, whereby the incontinence aids used by 25 residents during a 48 hour period were weighed. The second phase was the completion of a questionnaire by the municipal nurses working in the same local authority. The questionnaire covered: the division of responsibilities; routines for testing incontinence aids, and the level of knowledge concerning individual incontinence aid testing. Only 22 % of the pads used during the observation were properly adapted to the patients’ urinary leakage volume, while 76 % of incontinence aids were larger than necessary in relation to the real volume of urinary leakage. The municipal nurses, who have a key role and formal responsibility for individual incontinence aid testing, considered that there was insufficient knowledge within the organisation concerning individual incontinence aid testing, and that the division of responsibilities in this area was unclear. There were great variations relating to the extent of the nurses’ involvement in individual incontinence aid testing, and the nurses stated that increased involvement in individual incontinence aid testing was dependent on more time being made available for this task. Only a minority of the nurses thought that the requisitioning of incontinence aids was preceded by individual testing of the incontinence pads within the organisation. The majority of nurses considered that this was not the case or were unsure of the situation.

Simulação numérica de um sistema de armazenamento de calor em estufas de plasticultura

Apresentar um modelo para simular um sistema de armazenamento de calor no solo em estufas para plasticultura é o objetivo do presente trabalho. O sistema consiste num feixe de tubos enterrados no solo. A convecção forçada de ar no seu interior realiza a troca térmica necessária para manter as estufas sob faixas desejadas de temperatura. O objetivo do modelo é investigar os efeitos no calor armazenado e a influência das variáveis, tais como diâmetro, comprimento, espaçamento entre os tubos e a velocidade de ar no canal provocam no sistema. O solo é tratado como um meio difusivo e avalia-se a contribuição do termo de condensação e evaporação da água contida no ar em escoamento nos tubos. A equação da energia é resolvida para o solo e para o ar. Os tubos de seção transversal circular são modelados como tubos de seção transversal quadrada com o objetivo de que as simulações possam ser processadas em coordenadas cartesianas. O programa resolve situações tridimensionais, transientes e emprega o Método dos Volumes Finitos para integrar as equações diferenciais governantes. O modelo original é baseado no modelo de Gauthier et al., 1997, tendo sido os resultados do mesmo foram usados para a validação do presente estudo. Um circuito de água quente é também projetado e apresentado para o aquecimento das estufas. A água circula através de mangueiras sobre o solo e é aquecida por um sistema de queimadores a gás liqüefeito de petróleo ou óleo combustível, transferindo assim calor para o interior da mesma. O projeto de aquecimento foi realizado através de um programa de parceria entre a Ufrgs, Sebrae, Fapergs e a Agropecuária Clarice.

Cultura organizacional e inovação : estudo de caso em um hospital privado com as características de inovação no município de São Paulo

A inovação tem sido considerada um tema estratégico na administração, assim com a implantação de novas tecnologias levando a um maior desafio para as organizações. O trabalho apresenta um instrumento de análise da cultura organizacional e da sua relação com a inovação, incluindo o ambiente em que aa organizações se situam. A intenção foi verificar a presença de elementos da cultura e sua relação com a implantação de inovação nas organizações. Para isso foi realizada uma pesquisa em uma organização hospitalar do município de São Paulo. Ë um fato que as organizações de saúde atualmente investem em inovação tecnológica, mas procurou-se analisar inovação com caráter de mudança de processo. Conceitos de cultura, valores, conhecimento, aprendizagem organizacional foram abordados. A metodologia consistiu em um estudo de caso com entrevistas com 20 funcionários de nível gerencial e operacional, nas diversas áreas envolvidas, tanto administrativas como assistenciais. Estudou-se a implantação de um projeto que envolvia principalmente as áreas de enfermagem, farmácia e hotelaria do hospital.