Iota Horologii Is Unlikely to Be an Evaporated Hyades Star

We present a high-precision chemical analysis of ι Hor (iota Horologii), a planet-host field star thought to have formed in the Hyades. Elements with atomic number 6 ≤ Z ≤ 30 have abundances that are in excellent agreement with those of the cluster within the ±0.01 dex (or ≃ 2%) precision errors. Heavier elements show a range of abundances such that about half of the Z > 30 species analyzed are consistent with those of the Hyades, while the other half are marginally enhanced by 0.03 ±0.01 dex (≃7 ± 2%). The lithium abundance, A(Li), is very low compared to the well-defined A(Li)-Teff relation of the cluster. For its Teff, ι Hor's lithium content is about half the Hyades'. Attributing the enhanced lithium depletion to the planet would require a peculiar rotation rate, which we are unable to confirm. Our analysis of ι Hor's chromospheric activity suggests Prot = 5 days, which is significantly shorter than previously reported. Models of Galactic orbits place ι Hor hundreds of parsecs away from the cluster at formation. Thus, we find the claim of a shared birthplace very difficult to justify.D.Y. acknowledges support from the Australian Research Council (FT140100554). A portion of this work was carried out by E.G. during the TAURUS program at The University of Texas at Austin, which was partly supported by the National Science Foundation under grant 1313075. D.L.L. thanks the Robert A. Welch foundation of Houston, Texas for support through grant F-634. Some of this work is based on observations made with ESO Telescopes at the La Silla Paranal Observatory under the programs listed in Table 1 and Section 3

Establecimiento in vitro de Morera

Apical buds like explantes were used which were established in the culture medium proposed by Murashige and Skoog. In the disinfection sodium hypoclorite was used to the 0.5, 1.0 and 1.5% during 10, 15 and 20 minutes and the combination of sodium hypoclorite and ethanol 70%, evaluating microbial contamination (%) and survival (%). In the establishment it evaluated the Influence of the 6-BAP and kinetin using 0.5, 1.0 and 2.0 mg.l-1 in each one of them, culture medium semisolid as liquid and the sprouted explants was evaluated (%), height of buds (cm) and survival (%). With the combination of sodium hypoclorite 1% and ethanol 70% (p0.05) it decreased to 0.9% the microbial contamination and to improve to 98.4% the survival of explants. In the establishment better results were observed with 6-BAP compared with kinetin and the best treatment was using 0.5 mg.l-1 6-BAP the 97.4 and 98.2% of the explantes sprouted respectively in the culture medium semisolid and liquid being obtained, being statistically different (p 0.05) with the other treatments; in the same way for height of buds which was of 4.91 and 5.06 cm and, the lowest value in 2.42 and 2.8 cm were observed in the control.Key words: apical buds, cytokinin, Morus alba L, sproutingSe utilizaron yemas apicales como explantes los cuales fueron establecidos en el medio de cultivo propuesto por Murashige y Skoog. En la desinfección se utilizó Hipoclorito de Sodio al 0.5, 1.0 y 1.5% durante 10, 15 y 20 minutos y la combinación de Hipoclorito de Sodio y etanol al 70%. Se determinó el porcentaje de contaminación microbiana y de supervivencia. En el establecimiento in vitro se evalúo la Influencia del 6-BAP y la kinetina en concentraciones de 0.5, 1.0 y 2.0 mg l-1 en cada una de ellas, tanto en medio de cultivo semisólido como líquido y se evaluaron los porcentajes de explantes brotados y de supervivencia así como la longitud de los brotes (cm). Con la combinación de Hipoclorito de Sodio al 1% y etanol al 70% (p0.05) se redujo a 0.9% la contaminación microbiana y se mejoró la supervivencia de los explantes hasta 98.4%. En el establecimiento in vitro se observaron los mejores resultados con 6-BAP comparado con kinetina y el mejor tratamiento fue al utilizar 0.5 mg l-1 de 6-BAP con el cual se obtuvo el 97.4 y 98.2% de los explantes brotados en el medio de cultivo semisólido y líquido respectivamente con diferencias estadísticas (p0.05) con los demás tratamientos. De la misma manera para la variable longitud de brotes la cual fue de 4.91 y 5.06 cm y el valor más bajo de 2.42 y 2.8 cm se observó en el control.Palabras clave: citoquinina, brotación, Morus alba L, yemas apicale

Semi-Huber quadratic function and comparative study of some MRFs for Bayesian image restoration

The present work introduces an alternative method to deal with digital image restoration into a Bayesian framework, particularly, the use of a new half-quadratic function is proposed which performance is satisfactory compared with respect to some other functions in existing literature. The bayesian methodology is based on the prior knowledge of some information that allows an efficient modelling of the image acquisition process. The edge preservation of objects into the image while smoothing noise is necessary in an adequate model. Thus, we use a convexity criteria given by a semi-Huber function to obtain adequate weighting of the cost functions (half-quadratic) to be minimized. The principal objective when using Bayesian methods based on the Markov Random Fields (MRF) in the context of image processing is to eliminate those effects caused by the excessive smoothness on the reconstruction process of image which are rich in contours or edges. A comparison between the new introduced scheme and other three existing schemes, for the cases of noise filtering and image deblurring, is presented. This collection of implemented methods is inspired of course on the use of MRFs such as the semi-Huber, the generalized Gaussian, the Welch, and Tukey potential functions with granularity control. The obtained results showed a satisfactory performance and the effectiveness of the proposed estimator with respect to other three estimators

Preliminary evaluation of the presence of organochlorine pesticides in fish of Vicente Guerrero dam (Tamaulipas, Mexico)

Organochlorine pesticides (OCPs) are classified as persistent organic pollutants. The presence of OCPs in the environment is of global concern as they are persistent, ubiquitous and highly toxic. The purpose of this study was to evaluate the presence of organochlorine pesticides (aldrin, endrin, chlordane, mirex, heptachlor, DDT, DDE and DDD) in the muscle of four fish species from Vicente Guerrero Dam in Tamaulipas (Mexico): catfish (Ictalurus punctatus), carp (Ciprynus carpio), largemouth bass (Micropterus salmoides) and tilapia (Oreochromis niloticus). Solid phase extraction and gas chromatography with electron capture detector was used to detect the pesticides. The highest concentration found was for DDE in largemouth bass, carp and catfish (239.90, 165.98 and 212.31 ng/g, respectively) and for chlordane in catfish and largemouth bass (44.66 and 64.22 ng/g). There is a risk of carcinogenic effects if carp and largemouth bass are regularly consumed by the population in the region as the concentration of p-p′-DDE is higher than the recommendations of the US Environmental Protection AgencyLos pesticidas organoclorados (OCPs por sus siglas en inglés) están clasificados como contaminantes orgánicos persistentes. La presencia de OCPs en el ambiente es de interés mundial debido a que son persistentes, ubicuos y altamente tóxicos. El objetivo de este trabajo fue evaluar la presencia de pesticidas organoclorados (aldrín, endrín, clordano, mirex, heptacloro, DDT, DDE, DDD) en el músculo de 4 especies de pescado de la Presa Vicente Guerrero del estado de Tamaulipas (México): bagre (Ictalurus punctatus); carpa (Ciprynus carpio), lobina (Micropterus salmoides) y tilapia (Oreochromis niloticus). Para la determinación de los pesticidas se usó extracción en fase sólida y cromatografía de gases con detector de captura de electrones. La mayor concentración encontrada fue para el DDE en lobina, carpa y bagre (239,90, 165,98 y 212,31 ng/g, respectivamente) y para el clordano en bagre y lobina (44,66 y 64,22 ng/g). Existe riesgo de cáncer por el consumo de carpa y lobina en forma regular por parte de la población que habita en la región debido a que los altos niveles de p-p′-DDE encontrados superan las recomendaciones de la Agencia de Protección del Medio Ambiente de Estados UnidosA SEMARNAT-CONACYT por el financiamiento al proyecto SEMARNAT–2002–C01–0462S

Active commuting to and from university, obesity and metabolic syndrome among Colombian university students

Background: There is limited evidence concerning how active commuting (AC) is associated with health benefits in young. The aim of the study was to analyze the relationship between AC to and from campus (walking) and obesity and metabolic syndrome (MetS) in a sample of Colombian university students. Methods: A total of 784 university students (78.6% women, mean age = 20.1 ± 2.6 years old) participated in the study. The exposure variable was categorized into AC (active walker to campus) and non-AC (non/infrequent active walker to campus: car, motorcycle, or bus) to and from the university on a typical day. MetS was defined in accordance with the updated harmonized criteria of the International Diabetes Federation criteria. Results: The overall prevalence of MetS was 8.7%, and it was higher in non-AC than AC to campus. The percentage of AC was 65.3%. The commuting distances in this AC from/to university were 83.1%, 13.4% and 3.5% for < 2 km, 2- 5 km and > 5 km, respectively. Multiple logistic regressions for predicting unhealthy profile showed that male walking commuters had a lower probability of having obesity [OR = 0.45 (CI 95% 0.25–0.93)], high blood pressure [OR = 0.26 (CI 95% 0.13–0.55)] and low HDL cholesterol [OR = 0.29 (CI 95% 0.14–0.59)] than did passive commuters. Conclusions: Our results suggest that in young adulthood, a key life-stage for the development of obesity and MetS, AC could be associated with and increasing of daily physical activity levels, thereby promoting better cardiometabolic health.This study was part of the project entitled “Body Adiposity Index and Biomarkers of Endothelial and Cardiovascular Health in Adults”, which was funded by Centre for Studies on Measurement of Physical Activity, School of Medicine and Health Sciences, Universidad del Rosario (Code N° FIUR DNBG001) and Universidad de Boyacá (Code N° RECT 60)

Gobernanza y gestión del agua en el Occidente de México: la metrópoli de Guadalajara

La disponibilidad de agua como tal no es el problema más importante en la gestión del agua. La incertidumbre se sitúa en la capacidad para implementar sistemas de control, distribución y acceso al agua de una forma equitativa. Garantizar el acceso de agua potable a toda la población no es un problema financiero sino político, un asunto de prioridad .Ahora disponemos de un vasto conocimiento y herramientas aplicables en el campo de la hidrología, biotecnología e ingeniería del agua, pero nuestro entendimiento sobre procesos socioeconómicos, culturales y políticos involucrados en la gestión del agua, sigue siendo limitado. En este libro, desde diferentes ángulos, se analizan formas de gestión del agua, escenarios de gobernanza, conflictos sociales y soluciones de carácter sociopolítico y técnico encaminadas a un manejo más sustentable del agua con posibilidades de ser apropiado socialmente. La obra tiene un fuerte componente con tintes de ecología política alrededor de los conflictos por el agua en la metrópoli de Guadalajara y la cuenca Lerma–Chapala–Santiago, sobre todo en aquellos casos donde coinciden situaciones de deterioro ambiental y formas inadecuadas de desarrollo urbano. En las alternativas que se analizan y proponen, se descubre una rica diversidad que encabezan organizaciones sociales, ciudadanos, actores sociopolíticos, universidades e instituciones con diferentes niveles de impacto, vinculación y trayectorias. Se distinguen escalas y formas de gobernanza del agua a nivel de cuenca, zona metropolitana de Guadalajara, municipios y sistemas hidrográficos (microcuencas y sistemas de abastecimiento), además de revisar estilos de desarrollo urbano asociados al manejo del agua con una perspectiva de análisis y de propuesta.ITESO, A.C