Homogeneous metallicities and radial velocities for Galactic globular clusters. II. New CaT metallicities for 28 distant and reddened globular clusters

Although the globular clusters in the Milky Way have been studied for a long time, a significant fraction of them lack homogeneous metallicity and radial velocity measurements. In an earlier paper we presented the first part of a project to obtain metallicities and radial velocities of Galactic globular clusters from multiobject spectroscopy of their member stars using the ESO Very Large Telescope. In this paper we add metallicities and radial velocities for a new sample of 28 globular clusters, including in particular globular clusters in the MW halo and the Galactic bulge. Together with our previous results, this study brings the number of globular clusters with homogeneous measurements to $\sim 69$ \% of those listed in the W. Harris' catalogue. As in our previous work, we have used the CaII triplet lines to derive metallicities and radial velocities. For most of the clusters in this study, this is the first analysis based on spectroscopy of individual member stars. The metallicities derived from the CaII triplet are then compared to the results of our parallel study based on spectral fitting in the optical region and the implications for different calibrations of the CaII triplet line strengths are discussed. We also comment on some interesting clusters and investigate the presence of an abundance spread in the globular clusters here. A hint of a possible intrinsic spread is found for NGC 6256, which therefore appears to be a good candidate for further study.Comment: 13 pages, 9 figures, accepted for publication in Astronomy and Astrophysic

Fertirriego por goteo superficial y enterrado del melón (Cucumis melo L.) en invernadero

Este trabajo tuvo como objetivo determinar el efecto de dos posiciones de instalación de tubos porta goteros, tres láminas de riego y cuatro dosis de potasio sobre la productividad comercial de frutos de melón en invernadero. El experimento fue realizado en un invernadero de 420,0 m2, localizado en Piracicaba - São Paulo – Brasil. El diseño experimental fue en bloques completos al azar en esquema factorial de 2x3x4. Las posiciones de instalación de tubos porta goteros fueron superficial y enterrado a 0,2 m, las láminas de riego fueron 33, 67 y 100 % de la evaporación diaria de un mini tanque evaporimétrico y las dosis de potasio fueron 0, 6, 9 y 12 g de K2O planta-1. El fertirriego fue realizado basándose en la curva de absorción de N y K del cultivo. La evaporación total del mini tanque evaporimétrico durante la época de riego fue de 417,32 mm. La productividad comercial fue influenciada significativamente (P<0,01) por las dosis de potasio, láminas de riego y posición de los tubos porta goteros. Las dosis de potasio 6 y 9 g de K2O planta-1, combinadas con la lámina de 100% y la posición de los tubos porta goteros enterrados, alcanzaron mayor productividad comercial, 61.428 y 66.224 kg ha-1, respectivamente.Peer Reviewe

Size of predatory mites and refuge entrance determine success of biological control of the coconut mite

Published online: 06 July 2016Predators face the challenge of accessing prey that live in sheltered habitats. The coconut mite Aceriaguerreronis Keifer (Acari: Eriophyidae) lives hidden beneath the perianth, which is appressed to the coconut fruit surface, where they feed on the meristematic tissue. Its natural enemy, the predatory mite Neoseiuluspaspalivorus De Leon (Acari: Phytoseiidae), is larger than this pest and is believed to gain access to the refuge only after its opening has increased with coconut fruit age. In the field, experimentally enlarging the perianth-rim-fruit distance beyond the size of the predators resulted in earlier predator occurrence beneath the perianth and lower numbers of coconut mites. On non-manipulated coconut fruits, the predators gained access to the prey weeks later than on manipulated ones, resulting in higher pest densities of coconut mites. Successful biological control thus critically hinges on the size of the predator relative to the opening of the prey refuge

Polarization of dental caries among individuals aged 15 to 18 years

OBJECTIVE: To evaluate the role of socioeconomic variables and self-perceived oral health in the polarization of caries among adolescents in Santa Bárbara D'Oeste, Brazil. MATERIAL AND METHODS: Cross-sectional study. Sampling was randomized and sample size was defined according to WHO criteria. Two hundred and seventy seven adolescents (15 to 18 year-old) were examined by five trained examiners that assessed DMFT index according to WHO criteria. Self-perceived oral health, access to dental services and socio-demographic variables were self-reported. Student's t tests, chi-square tests, and multivariate logistic regression (with significant caries index (SiC) as the outcome), were performed. RESULTS: Mean DMFT was 5.48 (&plusmn;4.22) and the proportion of "caries free" subjects was 15.5%. Mean DMFT (9.71&plusmn;2.85) and mean D (1.67&plusmn;2.18) of SiC positive subjects were significantly higher than mean DMFT (2.88&plusmn;2.17) and mean D (0.45&plusmn;0.87) of SiC negative subjects (

Using a nitrilase for the surface modification of acrylic fibres

The surface of an acrylic fibre was modified with a commercial nitrilase (EC 3.5.5.1). The effect of fibre solvents and polyols on nitrilase catalysis efficiency and stability was investigated. The nitrilase action on the acrylic fabric was improved by the combined addition of 1 M sorbitol and 4% N, N-dimethylacetamide. The colour levels for samples treated with nitrilase increased 156% comparing to the control samples. When the additives were introduced in the treatment media, the colour levels increased 199%. The enzymatic conversion of nitrile groups into the corresponding carboxylic groups, on the fibre surface, was followed by the release of ammonia and polyacrylic acid. A surface erosion phenomenon took place and determined the “oscillatory” behaviour of the amount of dye uptake with time of treatment. These results showed that the outcome of the application of the nitrilase for the acrylic treatment is intimately dependent on reaction media parameters, such as time, enzyme activity and formulation.(undefined

Cuentos interactivos y la comprensión lectora en niñas y niños de 5 años en un colegio de Lima, 2021

La comprensión lectora es la manera en que el lector interpreta la información que está leyendo, desde los conocimientos y experiencias previas que ayuda a comprender lo leído. El objetivo de la presente investigación fue determinar la influencia de los cuentos interactivos en la comprensión lectora en niñas y niños de 5 años en un colegio de Lima, 2021. El enfoque de la investigación fue cuantitativo, con diseño experimental, de tipo pre experimental, con una muestra de 21 estudiantes de 5 años del nivel inicial, de la ciudad de Lima, Perú. El instrumento utilizado fue una guía de observación, teniendo como resultado general diferencias significativas de forma positiva en cuanto a la comprensión lectora, luego de haber concluido el programa VASPER “Mi cuento, te cuento” (gl= 21; sig= 0,000; p<0.005). Se concluyó que existen evidencias donde se afirma que los cuentos interactivos han tenido resultados satisfactorios en el desarrollo de la comprensión lectora en los niños que han participado en el programa, teniendo en un inicio de la medición del pretest un 81% que se encontraba en un nivel bajo, y al término del programa con la toma del postest el 100% de los estudiantes alcanzaron un nivel alto en la variable de la comprensión

Teorías, tensiones y convergencia del desarrollo deportivo

The purpose of this article is to describe the theoretical tendencies, analyze the emerging tensions and propose the points of convergence of the theories of sports development. From an exploratory analysis of the various theoretical approaches described sports development, the emphasis of political tensions, ideological and market were analyzed. Finally, the points of convergence of sports development theories are proposed. It is concluded that sports development adopts different emphases in response to political situations and ideologies and shows its main theoretical advances in the management of elite sport, however, the most extensive evidence focuses on the influence of sport on the processes of social change..Key words: Sports management, sports organizations, paradoxes, theoretical trends.Este artículo tiene como propósito describir las ten-dencias teóricas, analizar las tensiones emergentes y proponer los puntos de convergencia de las teorías del desarrollo deportivo. A partir de un análisis exploratorio se describieron los distintos enfoques teóricos del desa-rrollo deportivo, se analizaron las tensiones emergentes de énfasis de política, las ideológicas y las de mercado. Al final, normativamente se proponen los puntos de convergencia de las teorías del desarrollo deportivo. Se concluye que el desarrollo deportivo adopta diferentes énfasis como respuesta a las coyunturas e ideologías po-líticas y muestra sus principales avances teóricos en la gestión del deporte de elite, sin embargo, la evidencia más extensa se concentra en la influencia del deporte sobre los procesos de cambio social.Actividad Física y Deport