La Ca??ada Real de la Plata a su paso por la provincia de Zamora : tratamiento multidisciplinar de los temas transversales

Contiene : 1- Gu??a did??ctica, 2- Actividades (cuaderno de ruta), 3- Proyecto de trabajo y 4- Disquete. El ejemplar con n??mero de Registro x no tiene disquete ni diapositivas. No consta centro realizador. Premio Nacional a la Innovaci??n Educativa, 1997

La escuela y la familia como factores de potenciación de la lectura.

Incluye fotografías que ilustran las actividades llevadas a cabo en los distintos CEIP

Patrimonio local y turismo de interior : Calzada de Caltrava y Aldea del Rey

Resumen basado en el de la publicación.

La obra ben??fico-pedag??gica de do??a Carolina ??lvarez : el Colegio Mayor ??San Juan de Ribera??

Se hace un breve recorrido por la historia del Colegio Mayor San Juan de Ribera. Esta instituci??n es fundada por Carolina ??lvarez y Ruiz como una fundaci??n ben??fico-instructiva para proteger a j??venes sin recursos econ??micos. Se hace un resumen sobre el origen del Colegio Mayor, el edificio donde se ubica y sus estatutos y reglamentos.

La Mentoría, un sistema de tutorización del máster en docencia universitaria para profesorado novel de la Universidad de Barcelona

En este trabajo se describe el funcionamiento de un sistema de tutorización de profesores universitarios que realizan un Máster en Docencia Universitaria para Profesorado Novel en la Universidad de Barcelona. La tutorización está basada en las mentorías. La mentoría es una modalidad de tutoría que se ha adaptado a la formación de profesorado novel. Esta forma de tutorización es bastante diferente de la tutoría académica o la de carrera de los estudiantes de grado. El mentor es un profesor con experiencia docente e investigadora, que tiene una triple función: a) supervisar la formación y la práctica docente del profesorado novel; b) acompañarlo en su integración en equipos docentes de departamento o de facultad, y c) orientarlo en la toma de decisiones que como profesional ha de asumir. La mentoría, en este máster, se complementa con el apoyo de una Comisión de seguimiento que proporciona asistencia y ayuda a la acción tutorial

Cómo mejorar la competitividad a través de programas de mejoramiento continuo y el uso del Balanced Scorecard.© Caso: Grunenthal Ecuatoriana Cía. Ltda.

Grunenthal Ecuatoriana Cia. Ltda. es una empresa que ha ocupado un elevado nivel de competitividad durante veinticinco años en el país, razón por la cual se hace indispensable desarrollar una propuesta de mejora continua que permita ajustar las actividades y procesos a una mayor efectividad sostenible en el tiempo. Caso contrario dadas las condiciones económicas del país el futuro empresarial se tornará incierto. El presente trabajo de investigación está destinado a determinar los lineamientos, políticas y normas que una organización debe seguir o establecer dentro de su plan estratégico de mejoramiento continuo. Además permitirá medir la gestión realizada por las diferentes áreas o departamentos de la organización a través del cuadro de mando integral. Y principalmente determinar como lograr una Organización de Calidad a través del uso del cuadro de mando Integral como herramienta de medición de gestión.

Distribution of calcium (Ca) and magnesium (Mg) in the leaves of Brassica rapa under varying exogenous Ca and Mg supply

Background and Aims Leafy vegetable Brassica crops are an important source of dietary calcium (Ca) and magnesium (Mg) and represent potential targets for increasing leaf Ca and Mg concentrations through agronomy or breeding. Although the internal distribution of Ca and Mg within leaves affects the accumulation of these elements, such data are not available for Brassica. The aim of this study was to characterize the internal distribution of Ca and Mg in the leaves of a vegetable Brassica and to determine the effects of altered exogenous Ca and Mg supply on this distribution. Methods Brassica rapa ssp. trilocularis ‘R-o-18’ was grown at four different Ca:Mg treatments for 21 d in a controlled environment. Concentrations of Ca and Mg were determined in fully expanded leaves using inductively coupled plasma-mass spectrometry (ICP-MS). Internal distributions of Ca and Mg were determined in transverse leaf sections at the base and apex of leaves using energy-dispersive X-ray spectroscopy (EDS) with cryo-scanning electron microscopy (cryo-SEM). Key Results Leaf Ca and Mg concentrations were greatest in palisade and spongy mesophyll cells, respectively, although this was dependent on exogenous supply. Calcium accumulation in palisade mesophyll cells was enhanced slightly under high Mg supply; in contrast, Mg accumulation in spongy mesophyll cells was not affected by Ca supply. Conclusions The results are consistent with Arabidopsis thaliana and other Brassicaceae, providing phenotypic evidence that conserved mechanisms regulate leaf Ca and Mg distribution at a cellular scale. The future study of Arabidopsis gene orthologues in mutants of this reference B. rapa genotype will improve our understanding of Ca and Mg homeostasis in plants and may provide a model-to-crop translation pathway for targeted breeding.

Mg/Ca partitioning between aqueous solution and aragonite mineral: a molecular dynamics study

We have calculated the concentrations of Mg in the bulk and surfaces of aragonite CaCO3 in equilibrium with aqueous solution, based on molecular dynamics simulations and grand-canonical statistical mechanics. Mg is incorporated in the surfaces, in particular in the (001) terraces, rather than in the bulk of aragonite particles. However, the total Mg content in the bulk and surface of aragonite particles was found to be too small to account for the measured Mg/Ca ratios in corals. We therefore argue that most Mg in corals is either highly metastable in the aragonite lattice, or is located outside the aragonite phase of the coral skeleton, and we discuss the implications of this finding for Mg/Ca paleothermometry.

Genetical and comparative genomics of Brassica under altered Ca supply identifies Arabidopsis Ca-transporter orthologs

Although Ca transport in plants is highly complex, the overexpression of vacuolar Ca2+ transporters in crops is a promising new technology to improve dietary Ca supplies through biofortification. Here, we sought to identify novel targets for increasing plant Ca accumulation using genetical and comparative genomics. Expression quantitative trait locus (eQTL) mapping to 1895 cis- and 8015 trans-loci were identified in shoots of an inbred mapping population of Brassica rapa (IMB211 × R500); 23 cis- and 948 trans-eQTLs responded specifically to altered Ca supply. eQTLs were screened for functional significance using a large database of shoot Ca concentration phenotypes of Arabidopsis thaliana. From 31 Arabidopsis gene identifiers tagged to robust shoot Ca concentration phenotypes, 21 mapped to 27 B. rapa eQTLs, including orthologs of the Ca2+ transporters At-CAX1 and At-ACA8. Two of three independent missense mutants of BraA.cax1a, isolated previously by targeting induced local lesions in genomes, have allele-specific shoot Ca concentration phenotypes compared with their segregating wild types. BraA.CAX1a is a promising target for altering the Ca composition of Brassica, consistent with prior knowledge from Arabidopsis. We conclude that multiple-environment eQTL analysis of complex crop genomes combined with comparative genomics is a powerful technique for novel gene identification/prioritization.

Cobalt incorporation in calcite: Thermochemistry of (Ca,Co)CO3 solid solutions from density functional theory simulations

The incorporation of cobalt in mixed metal carbonates is a possible route to the immobilization of this toxic element in the environment. However, the thermodynamics of (Ca,Co)CO3 solid solutions are still unclear due to conflicting data from experiment and from the observation of natural ocurrences. We report here the results of a computer simulation study of the mixing of calcite (CaCO3) and spherocobaltite (CoCO3), using density functional theory calculations. Our simulations suggest that previously proposed thermodynamic models, based only on the range of observed compositions, significantly overestimate the solubility between the two solids and therefore underestimate the extension of the miscibility gap under ambient conditions. The enthalpy of mixing of the disordered solid solution is strongly positive and moderately asymmetric: calcium incorporation in spherocobaltite is more endothermic than cobalt incorporation in calcite. Ordering of the impurities in (0001) layers is energetically favourable with respect to the disordered solid solution at low temperatures and intermediate compositions, but the ordered phase is still unstable to demixing. We calculate the solvus and spinodal lines in the phase diagram using a sub-regular solution model, and conclude that many Ca1-xCoxCO3 mineral solid solutions (with observed compositions of up to x=0.027, and above x=0.93) are metastable with respect to phase separation. We also calculate solid/aqueous distribution coefficients to evaluate the effect of the strong non-ideality of mixing on the equilibrium with aqueous solution, showing that the thermodynamically-driven incorporation of cobalt in calcite (and of calcium in spherocobaltite) is always very low, regardless of the Co/Ca ratio of the aqueous environment.

Análise de crescimento em Heteranthera reniformis, sob diferentes teores de Ca, Mg e S

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Dielectric and structural characterization of Pb1-xAxZr0.40Ti0.60O3 (A = Sr, Ca) ferroelectric ceramics

This paper reports the influence of Sr- and Ca-substitution on the structural and ferroelectric properties of Pb1-xSrxZr0.40Ti0.60O3 (PSZT) and Pb1-xCaxZr0.40Ti0.60O3 (PCZT) ceramic systems. The dielectric measurements show that these substitutions cause a diffuse behavior in the dielectric permittivity curves for all samples. According to the X-ray absorption near-edge structure (XANES) spectra collected at Ti K- and LIII-edge, when Pb was replaced by Sr or Ca, a decrease in the local distortion around Ti atoms in the TiO6 octahedron could be observed. The O K-edge XANES spectra also revealed that the hybridization between O 2p and Pb 6sp states decreased as the amount of Sr or Ca atoms increased. Based on these results, it was possible to ascertain that the ferroelectric behavior in PSZT and PCZT samples bears a close correlation to the hybridization weakening between O 2p and Pb 6 sp states. © 2013 by American Scientific Publishers.

Crescimento, alocação de recursos e requerimento de nutrientes em Heteranthera reniformis Ruiz e Pav

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

La población en situación de pobreza organizada en comedores populares de Pampas de San Juan; Lima-Perú 1989-1991

Incluye Bibliografía

New records of the harlequin frog Atelopus nahumae RUIZ-CARRANZA, ARDILA-ROBAYO & HERNANDEZ-CAMACHO, 1994, in the Sierra Nevada de Santa Marta (Colombia), with notes of its distribution (Anura: Bufonidae)

The known distribution of the harlequin frog, Atelopus nahumae RUIZ-CARRANZA, ARDILA-ROBAYO & HERNANDEZ-CAMACHO, 1994, is reported along with three new locality records in the northwestern Sierra Nevada de Santa Marta (Colombia). In the new localities, observations were made on the frog's mating behavior. This report adds the Cordoba River Basin, another high valley of the Sierra Nevada de Santa Marta, to the known range of A. nahumae. Nevertheless, the general distribution of the species in this region is largely unknown.