[Impact of asymptomatic maternal SARS-CoV-2 infection on foetal growth]. / Impacto de la infección materna asintomática por SARS-CoV-2 sobre el crecimiento fetal.

Introduction: The impact of asymptomatic infection by SARs-CoV-2 on foetal growth has not been described. The purpose of our study is to determine whether there is an increased risk of foetal growth restriction in pregnancies in which asymptomatic or mild infection by SARS-CoV-2 has been detected. Material and methods: Retrospective case-control study with a subset of pregnant women with a small for gestational age foetus. Groups were established according to birth weight percentile. Previous SARS-CoV-2 infection was defined by positive antibodies obtained on admission to hospital for delivery. Results: No statistically significant differences between controls and cases were recorded in terms of positive IgG antibodies (11.5 vs. 8.8%). There were no premature births or significant differences in the date or type of delivery. Conclusions: Asymptomatic infection by SARs-CoV-2 during pregnancy does not seem to affect foetal growth.

The Boltzmann project.

The International Committee for Weights and Measures (CIPM), at its meeting in October 2017, followed the recommendation of the Consultative Committee for Units (CCU) on the redefinition of the kilogram, ampere, kelvin and mole. For the redefinition of the kelvin, the Boltzmann constant will be fixed with the numerical value 1.380 649 × 10-23 J K-1. The relative standard uncertainty to be transferred to the thermodynamic temperature value of the triple point of water will be 3.7 × 10-7, corresponding to an uncertainty in temperature of 0.10 mK, sufficiently low for all practical purposes. With the redefinition of the kelvin, the broad research activities of the temperature community on the determination of the Boltzmann constant have been very successfully completed. In the following, a review of the determinations of the Boltzmann constant k, important for the new definition of the kelvin and performed in the last decade, is given.

Dissemination of thermodynamic temperature above the freezing point of silver.

The mise-en-pratique for the definition of the kelvin at high temperatures will formally allow dissemination of thermodynamic temperature either directly or mediated through high-temperature fixed points (HTFPs). In this paper, these two distinct dissemination methods are evaluated, namely source-based and detector-based. This was achieved by performing two distinct dissemination trials: one based on HTFPs, the other based on absolutely calibrated radiation thermometers or filter radiometers. These trials involved six national metrology institutes in Europe in the frame of the European Metrology Research Programme joint project 'Implementing the new kelvin' (InK). The results have shown that both dissemination routes are possible, with similar standard uncertainties of 1-2 K, over the range 1273-2773 K, showing that, depending on the facilities available in the laboratory, it will soon be possible to disseminate thermodynamic temperatures above 1273 K to users by either of the two methods with uncertainties comparable to the current temperature scale.

Thermodynamic temperature assignment to the point of inflection of the melting curve of high-temperature fixed points.

The thermodynamic temperature of the point of inflection of the melting transition of Re-C, Pt-C and Co-C eutectics has been determined to be 2747.84 ± 0.35 K, 2011.43 ± 0.18 K and 1597.39 ± 0.13 K, respectively, and the thermodynamic temperature of the freezing transition of Cu has been determined to be 1357.80 ± 0.08 K, where the ± symbol represents 95% coverage. These results are the best consensus estimates obtained from measurements made using various spectroradiometric primary thermometry techniques by nine different national metrology institutes. The good agreement between the institutes suggests that spectroradiometric thermometry techniques are sufficiently mature (at least in those institutes) to allow the direct realization of thermodynamic temperature above 1234 K (rather than the use of a temperature scale) and that metal-carbon eutectics can be used as high-temperature fixed points for thermodynamic temperature dissemination. The results directly support the developing mise en pratique for the definition of the kelvin to include direct measurement of thermodynamic temperature.

Aplicación del modelo de Educación Deportiva en segundo de Educación Primaria. Percepciones del alumnado y el profesorado / Sport Education model in second grade. Teachers and students’ perceptions / A aplicação do Modelo de Educação Desportiva no Segundo ano do primeiro ciclo de ensino. Perceções de alunos e professores

El presente trabajo pretende analizar la viabilidad del modelo de Educación Deportiva en segundo de Educación Primaria (7-8 años), a partir del análisis de las percepciones de una alumna en prácticas, su maestra colaboradora y los alumnos participantes, en el desarrollo de una unidad didáctica de balón prisionero. Se analizaron las percepciones de los docentesa través de entrevistas, y las de los alumnos mediante un cuestionario (Physical Education Season Survey; Mohr, Townsend, Rairigh y Mohr, 2003;Hastie y Sinelnikov, 2006) y la realización de dibujos. Los resultados mostraron percepciones muy positivas por parte de docentes y alumnos. Los resultados, en cuanto a dificultades y beneficios percibidos, coinciden conlo mostrado en la literatura tanto nacional como internacional en la percepción del modelo por parte de docentes y alumnos de mayor edad, lo cual parece indicar que el modelo de Educación Deportiva puede implementarse con éxito con alumnos de 7 años (AU)

This work analyzes the appropriateness of implementing Sport Education with second graders, through the experience of a pre-service teacher, the collaborator teacher, and students' perceptions during a teaching unit of Dodgeball conducted following the features of Sport Education. Pre-service teacher's and collaborator teacher's perceptions were analyzed through interviews. Students' perceptions were analyzed through the "Physical Education Season Survey" (Mohr, Townsend, Rairigh y Mohr, 2003; Hastie y Sinelnikov, 2006) and through drawings. Results are consistent with Spanish and international literature conducted with older students, thus, it can be conclude that Sport Education model can be appropriate for students as young as seven years old

Este trabalho analisa a viabilidade de implementar o Modelo de Educação Desportiva no Segundo ano do primeiro ciclo de ensino (7-8 anos), a partir da análise das perceções de um estudante-estagiário, do professor cooperante e dos alunos participantes numa unidade de ensino de dodgeball. As perceções dos professores foram captadas através de entrevistas e as dos alunos por meio de um questionário e da análise de desenhos (Physical Education Season Survey; Mohr, Townsend, Rairigh, y Mohr, 2003; Hastie y Sinelnikov, 2006). Os resultados mostraram que professores e alunos percecionaram ter vivido uma experiência extremamente positiva. A natureza dos benefícios percebidos e dos constrangimentos encontrados estão em concordância com achados anteriores, tanto da literatura espanhola como na internacional, sobre as perceções que professores e alunos mais velhos sustêm sobre o modelo. É fortemente sugerido que o Modelo de Educação Desportiva tem potencial para ser implementado com sucesso também com alunos na faixa etária dos 7 anos

Is a tan really beautiful?

History has demonstrated many dangerous beauty fads, including tanning, which have evolved into a false concept of beauty. A teaching tool, which emphasizes tanning as just a fashion trend rather than a beauty enhancer, can help discourage people from suntanning their skin.

[The dynamic morphology of the endothelial cells of aortocoronary vessels cultured in vitro]. / Morfología dinámica de las células endoteliales de los vasos aortocoronarios cultivados in vitro.

The morphologic and functional meaning of the endothelial cell, as the first cellular element between blood and tissues, has been investigated since the earliest histological knowledge of the vascular tree. Although there have been multiple attempts for its study, through different biological branches, very little has been comprehended in its dynamic biology, due to technical difficulties and to the apparent simplicity of this extraordinary cellular type. In this research we pretend to establish a morphodynamic pattern of the endothelial cells from the aortocoronary segment, using the particular advantages of tissue culture. Our results, have been obtained through careful observations with light microscopy under different optical systems and the help provided by spaced microcinematography. Our results showed the reality of the images in the different cellular phenomena, particularly, endocytotic pinocytosis, the dynamic of the cellular membrane, and the cell-cell linkages established in vitro.