The role of personal information sources on the decision-making process of Costa Rican dairy farmers

The attitudes of farmers in relation to the importance of different people as information and opinion sources (InfS) for different phases of the decision-making process were studied in 91 Costa Rican dairy farmers. The InfS studied were: Family members, Other farmers, Technical advisors, Farm staff and Commercial agents, while the phases were: Problem detection, Seeking for problem solutions, Seeking for new practices and Seeking for opinion. A Multidimensional Preference Analysis (MDPREF) was used to obtain a two-dimensional map of preference of the farmers. A factor analysis was used to define new variables representing the farmers' predilection towards the InfS. A canonical correlation analysis was performed to find-out simple and canonical correlation between farmers'/farms' characteristics and the InfS preferences. Informational profiles in the population were defined through a Cluster Analysis. The MDPREF suggests that Family members and Technical advisors were the most preferred InfS. However their relative importance changed throughout the phases. Farm staff were rated in third place and their role became more important in the ‘Problem detection’ phase. Other farmers and Commercial agents were, in general, the less preferred information sources. The former became slightly more important in the ‘Seeking for new practices’ phase. The canonical correlation analysis found three low-medium correlations between the farmers'/farms' characteristics and the InfS factors. These correlations showed that the farmers' age, educational level and dedication and the farms' characteristics of area, herd size and distance to population centres had significant influence on the preference of the farmers towards different information sources. The cluster analysis found nine groups of similar farmers according to their preferences towards informational sources. Some implications mainly for extension activities are also stated and discussed. The importance of different informational sources slightly change throughout the decision-making steps, the family and farm staff being the most preferred information sources

The nature of supernovae 2010O and 2010P in Arp 299 - II. Radio emission

We report radio observations of two stripped-envelope supernovae (SNe), 2010O and 2010P, which exploded within a few days of each other in the luminous infrared galaxy Arp 299. Whilst SN 2010O remains undetected at radio frequencies, SN 2010P was detected (with an astrometric accuracy better than 1 milli arcsec in position) in its optically thin phase in epochs ranging from ~1 to ~3yr after its explosion date, indicating a very slow radio evolution and a strong interaction of the SN ejecta with the circumstellar medium. Our late-time radio observations toward SN 2010P probe the dense circumstellar envelope of this SN, and imply a mass-loss rate (Msun/yr) to wind velocity (in units of 10 km/s) ratio of (3.0-5.1)E-05, with a 5 GHz peak luminosity of ~1.2E+27 erg/s/Hz on day ~464 after explosion. This is consistent with a Type IIb classification for SN 2010P, making it the most distant and most slowly evolving Type IIb radio SN detected to date.Comment: 14 pages, 8 tables and 7 figures. Accepted for publication in MNRA

The Core-Collapse Supernova Rate in Arp299 Revisited

We present a study of the CCSN rate in nuclei A and B1 of the luminous infrared galaxy Arp299, based on 11 years of Very Large Array monitoring of their radio emission at 8.4 GHz. Significant variations in the nuclear radio flux density can be used to identify the CCSN activity in the absence of high-resolution very long baseline interferometry observations. In the case of the B1-nucleus, the small variations in its measured diffuse radio emission are below the fluxes expected from radio supernovae, thus making it well-suited to detect RSNe through flux density variability. In fact, we find strong evidence for at least three RSNe this way, which results in a lower limit for the CCSN rate of 0.28 +/- 0.16 per year. In the A-nucleus, we did not detect any significant variability and found a SN detection threshold luminosity which allows only the detection of the most luminous RSNe known. Our method is basically blind to normal CCSN explosions occurring within the A-nucleus, which result in too small variations in the nuclear flux density, remaining diluted by the strong diffuse emission of the nucleus itself. Additionally, we have attempted to find near-infrared counterparts for the earlier reported RSNe in the Arp299 nucleus A, by comparing NIR adaptive optics images from the Gemini-N telescope with contemporaneous observations from the European VLBI Network. However, we were not able to detect NIR counterparts for the reported radio SNe within the innermost regions of nucleus A. While our NIR observations were sensitive to typical CCSNe at 300 mas from the centre of the nucleus A, suffering from extinction up to A_v~15 mag, they were not sensitive to such highly obscured SNe within the innermost nuclear regions where most of the EVN sources were detected. (abridged)Comment: 12 pages, 4 figures and 7 tables. Accepted for publication in MNRA

Core-collapse supernovae missed by optical surveys

We estimate the fraction of core-collapse supernovae (CCSNe) that remain undetected by optical SN searches due to obscuration by large amounts of dust in their host galaxies. This effect is especially important in luminous and ultraluminous infrared galaxies, which are locally rare but dominate the star formation at redshifts of z~1-2. We perform a detailed investigation of the SN activity in the nearby luminous infrared galaxy Arp 299 and estimate that up to 83% of the SNe in Arp 299 and in similar galaxies in the local Universe are missed by observations at optical wavelengths. For rest-frame optical surveys we find the fraction of SNe missed due to high dust extinction to increase from the average local value of ~19% to ~38% at z~1.2 and then stay roughly constant up to z~2. It is therefore crucial to take into account the effects of obscuration by dust when determining SN rates at high redshift and when predicting the number of CCSNe detectable by future high-z surveys such as LSST, JWST, and Euclid. For a sample of nearby CCSNe (distances 6-15 Mpc) detected during the last 12 yr, we find a lower limit for the local CCSN rate of 1.5 +0.4/-0.3 x 10^-4 yr^-1 Mpc^-3, consistent with that expected from the star formation rate. Even closer, at distances less than ~6 Mpc, we find a significant increase in the CCSN rate, indicating a local overdensity of star formation caused by a small number of galaxies that have each hosted multiple SNe.Comment: 16 pages, 5 figures, 11 tables, minor changes to match the published versio

Estrés parental y desarrollo infantil en niños prematuros

El presente trabajo trata de analizar si los niveles de estrés experimentados por los progenitores inciden sobre el desarrollo mental y motor de un grupo de niños nacidos demasiado pequeños o demasiado pronto. Participaron 19 niños y niñas nacidos, con menos de 36 semanas de gestación (media 29,84) y menos de 1500 gramos (media 1099,89), en el Hospital 12 de octubre de Madrid cuyos padres y madres consintieron participar en este trabajo. Los instrumentos utilizados fueron la Escala BSID-II para obtener los índices del desarrollo mental y psicomotor en los niños cuando alcanzaron la edad 2 años y la PSI de Abidin, para valorar el estrés total de los padres y madres participantes, así como su percepción de Malestar Paterno, Interacción Disfuncional y Niño Difícil. Los datos fueron sometidos a análisis de comparaciones de medias para muestras independientes. Los resultados indican que existen diferencias significativas entre los altos y los bajos niveles de estrés en cuanto a su incidencia en el desarrollo. En general, tanto en las madres como en los padres, cuando se obtiene una puntuación baja de estrés, existe un mejor desarrollo mental y psicomotor en los niños. Estos resultados se discuten a la luz de las investigaciones sobre el tema y se analizan las implicaciones para la elaboración de programas de atención temprana.The current document analyze if the parent’s stress levels influence the mental and motor development of a children’s group being born too young or too small. The participants were 19 preterm children born at the “Hospital 12 de Octubre” of Madrid with less than 36 gestation weeks (mean 29,84) and 1500 grammes (mean 1099,89), whose parents were agree to take part in this study. The employed instruments were the Bayley Scales of Infant Development (BSID-II) to obtain the mental and psychomotor index scores of the toddlers at 2 years old; and the Parenting Stress Index Short Form (PSI) of Abidin. to assess the Total Stress of the parents, and their perception of Parental Distress, Dysfunctional Parent-Child Interactions and Difficult Child also. The obtained data were analyzed comparing the means of two independent samples. The results show that there are significant differences in the children’s development depending of the high or low parental stress levels. In general terms, when parents have low levels of stress, a better mental and psychomotor development is observed in their children. These results are discussed in the light of other researches about the issue, being considered as well, their implications for the implementation of early intervention programs.peerReviewe

Itinerarios formativos para un aprendizaje personalizado

En esta contribución se presenta una experiencia que promueve la utilización de itinerarios flexibles de aprendizaje como estrategia para organizar las actividades formativas y favorecer el trabajo autorregulado de los estudiantes. Para su puesta en práctica, se ha creado material didáctico en distinto formato y se han diseñado secuencias de aprendizaje interactivas que exigen al estudiante responder a los retos que se le presentan. Para establecer el avance por las actividades, se ha implementado una herramienta configurable que define las rutas de navegación mediante una estructura jerárquica de nodos que se conectan entre sí según la respuesta del alumnado. La herramienta permite registrar cada paso del camino seguido para alcanzar los objetivos de cada itinerario. El nuevo modelo de aprendizaje personalizado se ha implementado en dos asignaturas básicas de matemáticas de primer curso de tres grados de Ingeniería de la Universidad de Cantabria. Como principales resultados, destacar la satisfacción de los estudiantes con la experiencia, la mejora notable en los indicadores académicos y la información que proporciona al profesorado el análisis de los datos registrados de la navegación por los itinerarios para detectar dificultades en el aprendizaje

Development of hybrid monoliths incorporating metal¿organic frameworks for stir bar sorptive extraction coupled with liquid chromatography for determination of estrogen endocrine disruptors in water and human urine samples

[EN] A novel coating based on hybrid monolith with metal-organic framework (MOF) onto conventional Teflon-coated magnetic stir bars was developed. For this purpose, the external surface of the Teflon stir bar was firstly vinylized in order to immobilize a glycidyl methacrylate (GMA)-based polymer onto the magnet. Then, an amino-modified MOF of type MIL-101 (NH2-MIL-101(Al)) was covalently attached to the GMA-based monolith. After the synthesis process, several parameters affecting extraction of target estrogens by stir bar sorptive extraction (SBSE) including pH, ionic strength, extraction time, stirring rate, desorption solvent, and desorption time were also investigated. The resulting hybrid monolith was evaluated as SBSE sorbent for extraction of three estrogens (estrone, 17 beta-estradiol, estriol) and synthetic 17 beta-ethinylestradiol from water and human urine samples followed by HPLC with fluorescence detection (excitation and emission wavelengths, 280 and 310 nm, respectively). Under the optimal experimental conditions, the analytical figures of the method were established, achieving satisfactory limits of detection in the range of 0.015-0.58 mu g L-1, recovery results ranging from 70 to 95% with RSD less than 6%, and precision values (intra- and inter-extraction units) below 6%.H. Martinez-Perez-Cejuela thanks the MSIU for a PhD FPU grant (ref. FPU18/02179). S. Z., I. L., and D. S. acknowledge the financial support of the Charles University (Project SVV 260 548), Charles University Grant Agency (Project GAUK No. 1070120), and EFSA-CDN project (no. CZ.02.1.01/0.0/0.0/16_019/0000841) cofunded by ERDF. This article is based upon work from the Sample Preparation Task Force and Network, supported by the Division of Analytical Chemistry of the European Chemical Society.Zatrochová, S.; Martínez-Pérez-Cejuela, H.; Catalá-Icardo, M.; Simó-Alfonso, EF.; Lhotská, I.; Atínský, D.; Herrero-Martínez, JM. (2022). Development of hybrid monoliths incorporating metal¿organic frameworks for stir bar sorptive extraction coupled with liquid chromatography for determination of estrogen endocrine disruptors in water and human urine samples. Microchimica Acta. 189(3):1-10. https://doi.org/10.1007/s00604-022-05208-6110189

Combining microfluidic paper-based platform and metal–organic frameworks in a single device for phenolic content assessment in fruits

A microfluidic paper-based device (µPAD) has been combined with metal–organic frameworks (MOFs) for total phenolic compounds (TPC) quantification in fruit samples for the first time. The performance of the µPAD, based upon the vertical flow approach, was enhanced in order to determine the TPC content with high accuracy in fruit samples. The method was based on the traditional Folin-Ciocalteu Index using gallic acid or oenotannin as reference phenolic compounds. This novel design and construction of the device are in agreement with the principles of Green Chemistry avoiding wax technology (lower toxicity). The analytical parameters that affect the colorimetric method (using digital imaging of the colored zone) performance were optimized including design, sample volume, and MOF amount. Then, the analytical features of the developed method were investigated such as dynamic range (1.6–30 mg L−1), limit of detection (0.5 mg L−1), and precision (RSD < 9%). Besides, the in-field analysis is achievable with a color stability up to 6 h after the loading process of the sample and storage stability for at least 15 days without performance losses (under vacuum at − 20 °C). Furthermore, the MOF ZIF-8@paper was characterized to study its composition and the successful combination. The feasibility of the proposed method was demonstrated by determining the TPC in 5 fruit samples using oenotannin as reference solute. The accuracy was validated by comparison of the data with the results obtained with the recommended protocol proposed by the International Organisation of Vine and Wine (OIV).info:eu-repo/semantics/publishedVersio