A chemical signature from fast-rotating low-metallicity massive stars: ROA 276 in ω Centauri

© 2017. The American Astronomical Society. All rights reserved. We present a chemical abundance analysis of a metal-poor star, ROA 276, in the stellar system ω Centauri. We confirm that this star has an unusually high [Sr/Ba] abundance ratio. Additionally, ROA 276 exhibits remarkably high abundance ratios, [X/Fe] , for all elements from Cu to Mo along with normal abundance ratios for the elements from Ba to Pb. The chemical abundance pattern of ROA 276, relative to a primordial ω Cen star ROA 46, is best fit by a fast-rotating low-metallicity massive stellar model of 20 , [Fe/H] = -1.8, and an initial rotation 0.4 times the critical value; no other nucleosynthetic source can match the neutron-capture element distribution. ROA 276 arguably offers the most definitive proof to date that fast-rotating massive stars contributed to the production of heavy elements in the early universe

Longitudinal study of physical fitness levels, BMI and childhood obesity in school context

This work is aimed at knowing the level of physical aptitude and its degree of association, regarding an urban and a rural area, in children from the primary education schools. The sample consisted of six schools from the primary education of the county of Fundão: Santa Teresinha school (a central school), and the schools of Valverde, Fatela, Enxames, Alcaria and Peroviseu (peripheral schools). The sample has been selected in order to have a certain number of pupils from a peripheral area and another one from a central area of the city. The total sample is represented by 161 pupils, 76 are female and 85 are male and they are aged between 6 and 10. 85 come from an urban area and 76 come from a rural area. The analysis of the physical aptitude had as a reference the battery Prudential Fitnessgram (2002). According to the results obtained in the anthropometry, boys and girls from rural areas are heavier and taller than the boys and girls from urban areas. Regarding the BMI and body fat, it is males in rural areas that show a higher number of pupils in the healthy zone. As far as females are concerned, it is the urban area that has more pupils in that zone. It was also noticed that there are a huge percentage of girls from the rural area in the thin zone. In the differentiation between genders, boys have better results in physical aptitude and obesity levels. Regarding the influence of the living area, there are obviously better results in the urban area than in the rural area. Our study reveals that there are significant differences in the physical aptitude tests when they were applied at two different moments. After the analysis and interpretation of the results, we can conclude that boys and girls coming from rural areas are taller and heavier than the ones from urban areas and that they exhibit a lower body mass index. When defining the percentage of subjects classified in the “healthy zone”, the BMI numbers in boys from rural areas that are in the healthy zone are higher than those of boys from urban areas. Regarding girls, the ones from urban areas as well as those from rural areas have almost the same percentage in the healthy zone. Concerning fat, it is males in the rural areas that have more pupils in the healthy zone. As for girls, the ones from the urban areas have better results in the three zones, being the healthy zone that has a higher percentage of girls. In the relationship between the genders, boys have better results in the levels of physical aptitude and obesity. In the relationship between the areas, the urban one shows better results. The existence of two periods of analysis allowed us to notice an improvement in all the tests

Invited review: Milk lactose—Current status and future challenges in dairy cattle

peer-reviewedLactose is the main carbohydrate in mammals' milk, and it is responsible for the osmotic equilibrium between blood and alveolar lumen in the mammary gland. It is the major bovine milk solid, and its synthesis and concentration in milk are affected mainly by udder health and the cow's energy balance and metabolism. Because this milk compound is related to several biological and physiological factors, information on milk lactose in the literature varies from chemical properties to heritability and genetic associations with health traits that may be exploited for breeding purposes. Moreover, lactose contributes to the energy value of milk and is an important ingredient for the food and pharmaceutical industries. Despite this, lactose has seldom been included in milk payment systems, and it has never been used as an indicator trait in selection indices. The interest in lactose has increased in recent years, and a summary of existing information about lactose in the dairy sector would be beneficial for the scientific community and the dairy industry. The present review collects and summarizes knowledge about lactose by covering and linking several aspects of this trait in bovine milk. Finally, perspectives on the use of milk lactose in dairy cattle, especially for selection purposes, are outlined

Olive Oil Composition: Volatile Compounds

volatile composition of olive oil

Quality assurance for CMS Tracker LV and HV Power Supplies

This work describes the quality assurance measurements that have been carried out on about 2000 Power Supply Units produced in CAEN technology for the CMS Silicon Tracker Detector. The automate procedure and the characteristics of the dedicated Test Fixture developed for this activity are described in details. Magnetic field tolerance and radiation hardness of Tracker power supply units is also discussed at length

Editorial

Editorial do terceiro número da Revista Letras Raras

Editorial

Editorial do Vol. 1, N. 1 (2012) da Revista Letras Raras - UFCG