Amphibia, Anura, Hylidae, Osteocephalus leoniae: distribution extension

Non

Reduction of arsenic content in a complex galena concentrate by Acidithiobacillus ferrooxidans

BACKGROUND: Bioleaching is a process that has been used in the past in mineral pretreatment of refractory sulfides, mainly in the gold, copper and uranium benefit. This technology has been proved to be cheaper, more efficient and environmentally friendly than roasting and high pressure moisture heating processes. So far the most studied microorganism in bioleaching is Acidithiobacillus ferrooxidans. There are a few studies about the benefit of metals of low value through bioleaching. From all of these, there are almost no studies dealing with complex minerals containing arsenopyrite (FeAsS). Reduction and/or elimination of arsenic in these ores increase their value and allows the exploitation of a vast variety of minerals that today are being underexploited. RESULTS: Arsenopyrite was totally oxidized. The sum of arsenic remaining in solution and removed by sampling represents from 22 to 33% in weight (yield) of the original content in the mineral. The rest of the biooxidized arsenic form amorphous compounds that precipitate. Galena (PbS) was totally oxidized too, anglesite (PbSO(4)) formed is virtually insoluble and remains in the solids. The influence of seven factors in a batch process was studied. The maximum rate of arsenic dissolution in the concentrate was found using the following levels of factors: small surface area of particle exposure, low pulp density, injecting air and adding 9 K medium to the system. It was also found that ferric chloride and carbon dioxide decreased the arsenic dissolution rate. Bioleaching kinetic data of arsenic solubilization were used to estimate the dilution rate for a continuous culture. Calculated dilution rates were relatively small (0.088–0.103 day(-1)). CONCLUSION: Proper conditions of solubilization of arsenic during bioleaching are key features to improve the percentage (22 to 33% in weight) of arsenic removal. Further studies are needed to determine other factors that influence specifically the solubilization of arsenic in the bioleaching system such as: pH, dissolved oxygen concentration, redox potentials, nature of concentrate and temperature among others. At. ferrooxidans was able to completely oxidize the minerals present during the arsenic bioleaching. Other elements present originally in the concentrate such as Zn, Sb, and Cu were also solubilized. The process of bioleaching is expected to be influenced by mechanisms that still need to be established due to the diversity of the minerals involved and by the presence of traces of metals in the concentrate. The increase in pulp density generates a decrease in the dissolved arsenic concentration. This decrease is greater in runs where air was not injected to the system. The maximum rate of arsenic dissolution in the concentrate was found using; small surface area of particle exposure, low pulp density, injecting air and adding 9 K medium to the system. The effect of addition of ferric chloride during the arsenic bioleaching resulted in a decrease of the solubilized arsenic in the system. The presence of CO(2 )is associated to the decrease in arsenic dissolution

An Atlas of Exotic Variability in IGR J17091-3624: A Comparison with GRS 1915+105

We performed an analysis of all RXTE observations of the Low Mass X-ray Binary and Black Hole Candidate IGR J17091-3624 during the 2011-2013 outburst of the source. By creating lightcurves, hardness-intensity diagrams and power density spectra of each observation, we have created a set of 9 variability `classes' that phenomenologically describe the range of types of variability seen in this object. We compare our set of variability classes to those established by Belloni et al. (2000) to describe the similar behaviour of the LMXB GRS 1915+105, finding that some types of variability seen in IGR J17091-3624 are not represented in data of GRS 1915+105. We also use all available X-ray data of the 2011-2013 outburst of IGR J17091-3624 to analyse its long-term evolution, presenting the first detection of IGR J17091-3624 above 150 keV as well as noting the presence of `re-flares' during the latter stages of the outburst. Using our results we place new constraints on the mass and distance of the object, and find that it accretes at <33% of its Eddington limit. As such, we conclude that Eddington-limited accretion can no longer be considered a sufficient or necessary criterion for GRS 1915+105-like variability to occur in Low Mass X-Ray Binaries.Comment: 26 Pages, 31 Figures, 8 Tables. Accepted to MNRA

Percepción del proceso salud-enfermedad-atención y aspectos que influyen en la baja utilización del Sistema de Salud, en familias pobres de la ciudad de Salta

The health-disease-care process is an individual and social construction through which the person elaborates his illness, and conditions the kind of help he will look for. The perception of this complex process is personal and subjective and it can only be understood in the context of the universe of beliefs, values and behaviors of the sociocultural environment of each person, as well as his life material conditions. The purpose of this paper has been to better know the factors that explain why the poor families of Salta City covered by the Primary Attention Health Program, under use the health public system. The results show that the perception of the health problems are very much influenced by the material conditions of their life and the sociocultural values towards health. The need to solve daily problems, like getting a job or getting food lessens the importance of health problems, specially in grown people, while health problems of children receive greater attention. The organization of the Sanitary System, as well as the relations between end users and health service providers discourage the concurrence to the health centers.El proceso salud-enfermedad-atención es una construcción individual y social mediante la cual el sujeto elabora su padecimiento, que condiciona los tipos de ayuda a buscar. La percepción de este complejo proceso es personal y subjetiva y solo puede comprenderse contextualizada en el universo de creencias, valores y comportamientos del medio sociocultural de cada persona, así como de las condiciones materiales de vida. El propósito de la investigación ha sido indagar acerca de los aspectos que dan cuenta de la baja utilización del sistema público de salud por parte de familias pobres de la ciudad de Salta bajo la cobertura del Programa de Atención Primaria de la Salud. Los resultados muestran que la percepción de los problemas de salud está fuertemente mediada por las condiciones materiales de vida y por la valoración de la salud en un contexto sociocultural específico. La resolución de problemas cotidianos como el trabajo y la alimentación fundamentalmente, opaca la percepción de un problema de salud, especialmente en los adultos, siendo los niños/as los sujetos de mayor atención. La organización del Sistema Sanitario, así como las relaciones que en su interior se establecen entre los usuarios y los prestadores desestimulan la concurrencia a los centros asistenciales

Percepción del proceso salud-enfermedad-atención y aspectos que influyen en la baja utilización del Sistema de Salud, en familias pobres de la ciudad de Salta

The health-disease-care process is an individual and social construction through which the person elaborates his illness, and conditions the kind of help he will look for. The perception of this complex process is personal and subjective and it can only be understood in the context of the universe of beliefs, values and behaviors of the sociocultural environment of each person, as well as his life material conditions. The purpose of this paper has been to better know the factors that explain why the poor families of Salta City covered by the Primary Attention Health Program, under use the health public system. The results show that the perception of the health problems are very much influenced by the material conditions of their life and the sociocultural values towards health. The need to solve daily problems, like getting a job or getting food lessens the importance of health problems, specially in grown people, while health problems of children receive greater attention. The organization of the Sanitary System, as well as the relations between end users and health service providers discourage the concurrence to the health centers.El proceso salud-enfermedad-atención es una construcción individual y social mediante la cual el sujeto elabora su padecimiento, que condiciona los tipos de ayuda a buscar. La percepción de este complejo proceso es personal y subjetiva y solo puede comprenderse contextualizada en el universo de creencias, valores y comportamientos del medio sociocultural de cada persona, así como de las condiciones materiales de vida. El propósito de la investigación ha sido indagar acerca de los aspectos que dan cuenta de la baja utilización del sistema público de salud por parte de familias pobres de la ciudad de Salta bajo la cobertura del Programa de Atención Primaria de la Salud. Los resultados muestran que la percepción de los problemas de salud está fuertemente mediada por las condiciones materiales de vida y por la valoración de la salud en un contexto sociocultural específico. La resolución de problemas cotidianos como el trabajo y la alimentación fundamentalmente, opaca la percepción de un problema de salud, especialmente en los adultos, siendo los niños/as los sujetos de mayor atención. La organización del Sistema Sanitario, así como las relaciones que en su interior se establecen entre los usuarios y los prestadores desestimulan la concurrencia a los centros asistenciales

Histamine inhibits adrenocortical cell proliferation but does not affect steroidogenesis.

Histamine (HA) is a neurotransmitter synthesized in most mammalian tissues exclusively by histidine decarboxylase enzyme. Among the plethora of actions mediated by HA, the modulatory effects on steroidogenesis and proliferation in Leydig cells (LCs) have been described recently. To determine whether the effects on LCs reported could be extrapolated to all steroidogenic systems, in this study, we assessed the effect of this amine on adrenal proliferation and steroidogenesis, using two adrenocortical cell lines as experimental models, murine Y1 cells and human NCI-H295R cells. Even when steroidogenesis was not modified by HA in adrenocortical cells, the biogenic amine inhibited the proliferation of H295R cells. This action was mediated by the activation of HRH1 subtype and an increase in the production of inositol phosphates as second messengers, causing cell-cycle arrest in the G2/M phase. These results indicate a new role for HA in the proliferation of human adrenocortical cells that could contribute to a better understanding of tumor pathology as well as to the development of new therapeutic agents.Fil: Pagotto, Romina María del Luján. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Pereyra, Elba Nora. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Monzón, Casandra Margarita. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Mondillo, Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); ArgentinaFil: Pignataro, Omar Pedro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Biología y Medicina Experimental (i); Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Biológica; Argentin

Incidencia del análisis financiero en la elaboración de proyecciones financieras de la Gasolinera Regional del Norte ubicado en la ciudad de Estelí, durante el primer trimestre 2019 y primer trimestre 2020

El tema que se aborda es la Incidencia del análisis financiero en la elaboración de proyecciones financieras de la Gasolinera Regional del Norte ubicado en la ciudad de Estelí, durante el primer trimestre 2019 y primer trimestre 2020. La investigación describe el análisis financiero en Gasolinera regional del norte así mismos se describe el proceso contable llevado a cabo en dicha entidad. El objetivo principal de la investigación desarrollada es realizar un análisis financiero que permita determinar la situación de la empresa y como esta incide en la elaboración de proyecciones. Para la recolección de la información se aplicó entrevistas al administrador, se realizó una guía de observación la cual fue implementada en el área contable, de igual manera se ejecutó una revisión documental que contempla la revisión de estados financieros contables de los periodos analizados como lo fueron balance general y estado de resultado de Gasolinera regional del norte. Los resultados que se obtuvieron y se muestran reflejan la importancia de la utilización del análisis financiero para conocer la situación de la empresa y así realizar proyecciones eficientes