Comodidad en el aula retos en la aplicación de antropometría en el diseño de mobiliario preescolar

Children’s population between two and five years old in Ecuador, who are registered in the period of initial education, do not have anthropometric evaluations in order to develop appropriate school furniture. The aim of this study was to elaborate an anthropometric table through a comparative analysis inside the population of study, in order to establish whether a mixed or a combined anthropometric table was in need of development, besides an anthropometric fitting trial for current furniture utilized. Hence, twelve anthropometric measurements were obtained from a population sample of 400 children from public schools and 400 children from private schools from Distrito Metropolitano de Quito. Two hypotheses were tested in the comparative analysis. First, If there were differences between the measurements from girls and boys; and second, differences between the measurements from children of public and private centers were analyzed. The results showed no significant statistical differences between boys and girls; however, there was a significant difference between the measurements of kids from private and public centers; as a result, a mixed anthropometric table was developed. Additionally, in terms of furniture fitting, the results showed the current furniture applied for the children from the sample, does not belong to the population, it is not suitable due to the dimensions applied in the manufacturing process belong to another population of children.La población de niños y niñas 2 a 5 años del Ecuador, que se encuentran registrados en el periodo de Educación Inicial no cuenta con estudios antropométricos para el desarrollo de mobiliario preescolar. El objetivo de este estudio fue elaborar una tabla antropométrica mediante un análisis comparativo dentro de la misma población para establecer si se debía desarrollar una tabla antropométrica mixta o combinada, además, de un análisis del calce del mobiliario actual. Se tomaron 12 medidas antropométricas a cada niño/a de un tamaño de muestra de 400 niños/as de Centros Públicos y 400 niños/as de Centros Privados del Distrito Metropolitano de Quito. Para el análisis comparativo se plantearon dos hipótesis, la primera: si existe diferencia entre las medidas de los niños y las niñas, y la segunda: si existe diferencia entre las medidas de los niños y niñas de Centros públicos y Centros privados. El resultado fue que no hay diferencia estadísticamente significativa entre las medidas de niños y niñas. Sin embargo, sí se encontró diferencia significativa entre las medidas de los niños/as de Centros públicos y privados, por lo que se realizó una tabla antropométrica mixta. En cuanto, al calce del mobiliario se encontró que el mobiliario que usan actualmente los niños/as no es el correcto ya que las dimensiones utilizadas en la construcción corresponden a otra población de niños/as

A comprehensive phylogeny reveals functional conservation of the UV-B photoreceptor UVR8 from green algae to higher plants

UV-B is present in sunlight (280- 315 nm) and has diverse effects on living organisms. Low fluence rate of exposure induces a specific photomorphogenic response regulated by the UV-B response locus 8 UVR8 receptor. UVR8 was first described in Arabidopsis thaliana. In the absence of stimuli is located in the cytoplasm as a homodimer, however, upon UV-B irradiation, it switches to a monomer and interacts with the ubiquitin ligase E3 COP1 via the UVR8 β- propeller domain and the VP core. This induces the expression of the transcription factor HY5 leading to changes in the expression of genes associated with UV-B acclimation and stress tolerance. UVR8 senses UV-B through tryptophan residues being Trp233 and 285 the most important. Here we report a comprehensive phylogeny of UVR8, trying to identify UVR8 homologs and the ancestral organism where this gene could be originated based on the comparison and analysis of UVR8 functionally important motifs. Results obtained showed that Chlorophytes are the first organisms from the Viridiplantae group where UVR8 appear. UVR8 is present in green algae, bryophytes, lycophytes and angiosperms. All the sequences identified contain tryptophans 233 and 285, arginines involved in homodimerization and the VP domain suggesting they are true UVR8 photoreceptors. We also determined that some species from bryophytes and angiosperms contain more than one UVR8 gene copy opening the question if UVR8 could constitute a gene family in these species. In conclusion, we described the functional conservation among UVR8 proteins from green algae to higher plants.Fil: Fernandez, María Belén. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; ArgentinaFil: Tossi, Vanesa Eleonora. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; ArgentinaFil: Lamattina, Lorenzo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; ArgentinaFil: Cassia, Raul Oscar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata. Instituto de Investigaciones Biológicas. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Investigaciones Biológicas; Argentin