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Sample records for pampa ondulada diferenciados

  1. Contracción de agregados de Argiudoles de la Pampa Ondulada diferenciados en su mineralogía de arcillas Shrinkage of soil aggregates from rolling Pampa Argiudolls differentiated by their clay mineralogy

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    Mario Guillermo Castiglioni

    2005-07-01

    Full Text Available La contracción y expansión del suelo afecta su comportamiento físico y químico. Mc Garry & Malafant desarrollaron un modelo en el que se separan tres zonas de contracción y a través del cual es posible estimar parámetros que tienen significado físico, siendo estos de utilidad para diferenciar a distintos suelos. El objetivo del presente trabajo fue determinar que propiedades y características de algunos Argiudoles de la Pampa Ondulada, diferenciados en su mineralogía de arcillas, influyen en los parámetros del modelo de expansión-contracción de Mc Garry & Malafant. Con la finalidad de determinar el cambio de volumen específico del suelo, a partir de variaciones en su contenido hídrico, se utilizaron agregados de distintos horizontes de tres suelos no disturbados. Se hicieron análisis de correlación entre los parámetros estimados del modelo de tres líneas con diferentes propiedades y características de los suelos analizados. El distinto comportamiento en el cambio de volumen de los horizontes argílicos con mineralogías contrastantes, fue principalmente a bajos contenidos de agua, mientras que el contenido de arcilla incidió sobre la pendiente de la zona normal de contracción y sobre algunos parámetros del modelo que se estiman a altos contenidos de agua edáfica. Independientemente del tipo de arcilla presente, el punto de entrada de aire de los horizontes argílicos fue registrado a contenidos de agua difíciles de ser hallados a campo. En los horizontes BC y C la acción conjunta de la CIC y del contenido de arcilla mostró una mejor correlación con la pendiente de la zona residual de contracción, respecto al efecto de estos dos parámetros tomados en forma separada. En los horizontes A y BA la CIC resultó ser el mejor estimador de la pendiente residual de contracción. Analizando en forma conjunta el comportamiento de los horizontes A, BA, BC y C, la humedad equivalente y la densidad de partícula fueron las

  2. La textura del suelo como factor regulador de la adsorción de Escherichia coli en una cuenca de la Pampa Ondulada (Argentina Soil texture as a regulating factor of Escherichia coli adsorption in a Rolling Pampa basin (Argentina

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    Filipe Behrends Kraemer

    2011-06-01

    Full Text Available El aumento de la carga animal vacuna en la Pampa Ondulada asociado a áreas frágiles supone un importante riesgo de contaminación biológica. Dicha contaminación está regulada por variables edáficas, como la textura, que controlan el transporte de contaminantes biológicos hacia los cuerpos de agua. En el presente trabajo se correlacionó la adsorción bacteriana del suelo con distintos tamaños de partículas individuales correspondientes a 27 suelos provenientes de una cuenca de la Pampa Ondulada. Para ello se utilizó una técnica de centrifugación lenta. Los valores de adsorción bacteriana, empleando en la determinación Escherichia coli ATCC 8739, variaron entre 25,3% y 73,3%, y el tamaño de partícula que mejor se correlacionó con esta propiedad fue el correspondiente a la fracción de arcillas (R² = 0,6. Esta correlación mejoró al considerar conjuntamente a todas las partículas menores de 3 µm (R² = 0,64, lo que resalta la capacidad de los limos muy finos en el fenómeno de adsorción. La curva de ajuste elaborada con los datos experimentales se comparó con la obtenida de acuerdo con el modelo propuesto por Ling et al. (2002. Se encontraron similitudes en la pendiente, no así en la ordenada al origen. Esta diferencia desapareció al emplear en la determinación una cepa autóctona aislada de deyecciones animales provenientes de la cuenca estudiada, dado que dicha cepa evidenció una adsorción 48% superior a la observada con la cepa de colección.

  3. Análisis de los escurrimientos de una microcuenca de Pampa Ondulada bajo diferentes sistemas de labranza Runoff analysis of a watershed belonging to the rolling Pampa under different tillage systems

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    Mario G. Castiglioni

    2006-12-01

    Full Text Available La tasa de escurrimiento del agua juega un rol crítico en la determinación de la pérdida de suelo en las tierras agrícolas. En la última década la siembra directa se ha difundido en la Pampa Ondulada en forma considerable, siendo escasos los estudios a nivel microcuenca en los cuales se analice sus efectos sobre los escurrimientos respecto a otros sistemas de labranza. El objetivo del presente trabajo fue comparar distintos parámetros correspondientes a la respuesta hidrológica superficial de una microcuenca de la Pampa Ondulada, ante cambios en los sistemas de labranza empleados. La microcuenca bajo estudio posee una superficie de 300 ha y está ubicada en la vertiente norte de la cuenca media del Arroyo del Tala, San Pedro, provincia de Bs. As. Los suelos presentes corresponden a la serie Ramallo (Argiudol vértico y sus fases por erosión. Se confeccionaron los hidrogramas y hietogramas correspondientes a las distintas tormentas ocurridas durante el período 1995-2002, analizándose los escurrimientos en forma global y los tramos ascendentes y descendentes de los caudales de agua obtenidos en forma separada. El sistema de labranza siembra directa originó valores de curva número mayores respecto al sistema convencional. La duración de los escurrimientos fue mayor bajo siembra directa debido a un alargamiento de la fase descendente de los hidrogramas. Los caudales de escurrimiento generados por unidad de lluvia caída fueron siempre menores bajo el sistema de siembra directa respecto al sistema de labranza convencional. Los milímetros escurridos durante la fase descendente de los hidrogramas no fue diferente entre sistemas de labranza ya que el menor caudal registrado bajo la siembra directa fue compensado por una mayor duración de este período en dicho sistema de labranza.The runoff rate constitutes a key factor in the determination of soil losses in arable lands. In the last decade, no tillage system became widespread in the

  4. Número de curva de escurrimiento para una microcuenca de Pampa Ondulada bajo labranza convencional y siembra directa Runoff curve number for a Rolling Pampa watershed under conventional and no-tillage

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    Celio I Chagas

    2008-07-01

    Full Text Available El objetivo del presente trabajo fue estudiar la aplicabilidad del método de Número de Curva (CN del USDA para una microcuenca agrícola de 300 ha de Pampa Ondulada, bajo labranza convencional (LC durante el período 1994-1998 y posteriormente bajo siembra directa (SD durante el período 1999-2004 a partir del análisis de lluvias y escurrimientos medidos in situ. El uso de la tierra consistió predominantemente en cultivos anuales, siendo la soja el cultivo más frecuente. De las 583 lluvias analizadas, tan solo el 11% provocó escurrimientos registrables. La mayoría de los escurrimientos ocurrió bajo condición antecedente de humedad (AMC I, situación que fue definida por la lluvia caída los 5 días anteriores al evento considerado, lo cual muestra un aspecto de discusión crítica para el uso de esta metodología. A través del análisis de la serie ordenada de datos, se observó que LC y SD presentaban valores prácticamente coincidentes entre sí tanto para AMC II (CN 82 como para AMC III (CN 96. Sin embargo, al considerar AMC I (correspondiente al 10% inferior de dicha serie, la labranza convencional presentó una tendencia a generar menores escurrimientos que siembra directa (CN 56 y 68, respectivamente particularmente durante el período otoño invernal, época en que se realizaron las labores primarias de remoción del suelo que dejaron el suelo rugoso y por ende, con alta capacidad de infiltración.The aim of this paper was to study the applicability of the Curve Number method (CN, USDA for a small arable watershed of 300 ha belonging to the Rolling Pampa under conventional tillage from 1994 to 1998 and subsequently under no tillage until 2004. This analysis was performed by studying rainfall and runoff paired data recorded in situ. Land use consisted mainly of annual crops, particularly soybean. Considering a data pool of 583 rainfall events, only 11% produced appreciable surface runoff. Most of the runoff occurred under

  5. Movimiento del agua en Argiudoles de la Pampa Ondulada con diferente mineralogía de arcillas Water movement in some Argiudolls of the rolling Pampa differing in their clay mineralogy

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    Mario Guillermo Castiglioni

    2007-12-01

    Full Text Available Los suelos zonales de la Pampa Ondulada son Argiudoles Típicos y Vérticos los cuales se diferencian en la composición mineralógica de su fracción arcilla. El objetivo del presente trabajo fue analizar las vinculaciones entre la tasa de movimiento del agua edáfica con algunos atributos relacionados con la composición mineralógica de la fracción arcilla, en distintos suelos representativos de la región mencionada. Se tomaron muestras de los horizontes A, BA/BE, Bt y BC de dos Argiudoles Típicos y de un Argiudol Vértico, realizando sobre las mismas determinaciones relacionadas con la cantidad y tipo de las arcillas presentes. A su vez mediante diferentes técnicas se evaluaron el sistema poroso del suelo y el movimiento de agua edáfica. En los horizontes Bt, aquellos parámetros que integran el tipo y el contenido de arcillas, como el COLE y la CIC, mostraron estar mejor vinculados con el movimiento de agua edáfica que cuando se consideró únicamente el porcentaje de arcilla. La distinta porosidad estructural generada dentro de los agregados de los horizontes Bt, originó diferencias en su difusividad y conductividad hidráulica no saturada, a contenidos de humedad por encima del 50% de saturación. En aquellos horizontes con mayor actividad biológica y menor contenido de arcilla, el movimiento de agua se realizó en forma independiente de las características de las arcillas presentes.Typic and Vertic Argiudolls, which differ in the composition of their clay fraction, are the zonal soils in the Rolling Pampa of Argentina. The aim of this work has been to analize the relationship between water movement and diverse soil properties in some representative soils of the Rolling Pampa, differing in their clay mineralogy. The A, BA/ BE, Bt and BC horizons of two Typic and one Vertic Argiudolls were sampled and a number of properties related with clay content and clay type were measured. Soil porosity and soil water movement were also

  6. Aplicación del modelo hidrológico-swat-en una microcuenca agrícola de La Pampa ondulada Application of the hydrologic model - swat - on a micro agricultural basin of the rolling Pampa

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    Felipe Behrends Kraemer

    2011-07-01

    Full Text Available El modelado hidrológico es a menudo el primer paso en el desarrollo de sistemas de decisión espacial para identificaráreas vulnerables a la contaminación por nutrientes, pesticidas así como también a contaminantes biológicos. En este sentido el SWAT (Soil and Water Assesment Tool fue desarrollado para predecir impactos de las prácticas de manejo de las tierras en las aguas, sedimentos y agroquímicos en cuencas hidrográficas con diferentes suelos, usos y prácticas en largos períodos de tiempo. Aunque el mismo está siendo aplicado en todo el mundo, todavía no esta difundido su uso en la Argentina, no encontrándose al momento reportes al respecto. Este modelo se utilizó en una microcuenca agrícola de la Pampa Ondulada (Argentina y fue calibrado y validado utilizando los valores de escurrimientos medidos in situ. Se encontraron buenas eficiencias a escala diaria (R²: 0,55; R² ENS: 0,52 y pobres a escala mensual (R²: 0,34; R² ENS: 0,04. En la calibración, los escurrimientos fueron sobreestimados en un 31,8% y 32,6% para la escala mensual y diaria respectivamente, mientras que en la validación se sobreestimó un 42,5% para los valores mensuales y un 41,2% para los diarios. La aplicación del SWAT en esta microcuenca agrícola resultó auspiciosa y conduce a la inclusión de dicho modelo en futuros trabajos.A hydrological model is often the first step for the development of spatial decision systems in order to identify vulnerable areas to the pollution by nutrients, pesticides as well as biological contaminants. The SWAT model was developed to predict the impact of land management on water, agrochemicals and sediments in hydrographical basins with different soils, land uses and practices for long time periods. This model is being used all over the world but it has not been applied in Argentina until present. The SWAT model was used in an agricultural microbasin in the Rolling Pampa (Argentina and was calibrated and validated

  7. Movimiento superficial de contaminantes biológicos de origen ganadero en la red de drenaje de una cuenca de Pampa Ondulada Surface movement of cattle-borne biological contaminants in the drainage network of a basin of the Rolling Pampas

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    Celio I Chagas

    2010-07-01

    Full Text Available Se estudió la concentración de indicadores de contaminación biológica en pequeñas depresiones ubicadas en vías de escurrimiento que atraviesan tierras dedicadas a la ganadería donde se acumulan aguas y sedimentos generados por la actividad agropecuaria de la Pampa Ondulada argentina. La carga animal de los lotes ubicados en la cuenca del Tala donde se encontraban las depresiones, se relacionó estrechamente con su carga de microorganismos. La intensidad de las lluvias previas al muestreo (en el caso de los coliformes totales y el lapso de tiempo entre el último escurrimiento significativo y el muestreo (para enterococos y estreptococos fecales resultaron variables sensibles para predecir la dinámica de la concentración de dichos grupos de microorganismos en los sitios de acumulación. Los resultados obtenidos corroboran la estrecha asociación que existe entre los procesos de escurrimiento y erosión hídrica y la contaminación biológica de las aguas acumuladas en las depresiones estudiadas. Estos elementos, sumados a los resultados de trabajos previos realizados en la región, permitieron elaborar un modelo conceptual sencillo de entradas y salidas de potenciales contaminantes físicos y biológicos en las depresiones estudiadas que podrá servir de base para el diseño de alertas tempranas de contaminación de los cursos de agua a nivel regional.Runoff water and sediments from crop and cattle production fields of the Rolling Pampas accumulate in small depressions along the drainage network. We studied the concentration of biological contamination indicators in these small sinks located in bottomlands devoted to cattle production of the Tala River basin. The stocking rate was closely related to the concentration of microorganisms in the depressions. The intensity of rainfall events previous to each sampling date and the time between the last significant runoff event and each sampling date proved to be sensible variables for

  8. Agricultural producers, undulated pampa and edaphic problems. A study of case in the Buenos Aires north-east Productores agropecuarios, pampa ondulada y problemáticas edáficas. Un estudio de caso en el noreste bonaerense

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    Pedro Tsakoumagkos

    2010-01-01

    Full Text Available Social, economic and production diversity of agriculturalization is evident in the various types of producers of the Wet Pampa. Agriculturalization is associated with changes in land quality, socio-productive structure, applied production strategies and forms of soil usage. Often arises, however, that the problems associated with that agriculturization, are the result of the implementation of relatively uniform technological packages, regardless of the different types of producers are carried out. Our hypothesis is, however, that deterioration in Argiudolls typical Pampas is the result, given different positions of the relief, complex combinations of various production strategies adopted by different types of producers. We worked in the locality of Luján. We typified producers by taking into consideration their capitalization levels (capitalized and non-capitalized and work organization (family, non-family. We defined five production strategies (4 agricultural strategies: one or two crops a year, no-till or conventional tillage; and 1 livestock production strategy and two environments (hill and low land. Based on the municipal land registry, we surveyed a statistically representative stratified sample by location and plot size. A sampling allowed us to analyze the following parameters: horizon depth, apparent density, organic matter, acidity, nitrogen, phosphorus and potassium. We calculated the content of organic matter and nitrogen by hectare, and the relative deterioration. We carried out a hypothesis test of comparison of mean values, test F and test t, and finally calculated the relative deteriorations. We used the organic matter content by hectare as indicator, due to its higher sensitivity towards changes in soil conditions. According to two of our main findings, firstly, when sowing in hill with no-till technique, all types of producers evidenced the lowest relative deterioration values, except for non capitalized family producers who

  9. Indicadores de contaminación biológica asociados a la erosión hídrica en una cuenca de Pampa Ondulada Argentina Indicators of biological contamination associated with water erosion in basin belonging the rolling pampa, Argentina

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    Celio I. Chagas

    2006-07-01

    Full Text Available La producción agropecuaria utiliza el 70% de los recursos hídricos superficiales. Una parte de esa agua es consumida por la ganadería, principalmente en forma de bebida animal. Existe un importante riesgo de contaminación biológica del agua asociada a dicha actividad, debido a que los patógenos eliminados a través de las deyecciones y orinas animales pueden ser transportados a las vías de agua, a través del escurrimiento superficial. El presente trabajo se realizó en la cuenca del arroyo del Tala, ubicada en la Pampa Ondulada y sujeta a intensos procesos de escurrimiento y erosión hídrica. En la cuenca existen explotaciones ganaderas extensivas asociadas a suelos hidro-halomórficos cercanos a las vías de agua y una cantidad creciente de explotaciones intensivas del tipo "engorde a corral". El principal uso agropecuario del agua del arroyo y de sus tributarios es en forma de bebida animal directa. Los objetivos del presente trabajo han sido analizar mediante algunos indicadores biológicos, la posible contaminación de las aguas y sedimentos acumulados en sectores bajos representativos de la actividad pecuaria de dicha cuenca y determinar el origen de su contaminación: humana o animal. Las aguas analizadas presentaron concentraciones de indicadores biológicos del grupo de los estreptococos y enterococos fecales compatibles con procesos de contaminación fecal de origen animal pero no de origen humano. Se observó una estrecha asociación entre la concentración de coliformes totales y la presencia de sólidos sedimentables originada por erosión hídrica, en las aguas de diversos ambientes bajos de la cuenca. De esta manera se puso de manifiesto la potencialidad de los sedimentos para actuar como transportadores de bacterias, algunas de las cuales pueden ser altamente patogénicas como es el caso de Salmonella spp. Los procesos de escurrimiento, erosión hídrica y contaminación biológica han probado estar relacionados entre s

  10. Derrida en las pampas

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    Analía Gerbaudo

    2011-07-01

    Full Text Available http://dx.doi.org/10.5007/1984-784X.2011v11n16p16 En el año 2003 Mariano Ben Plotkin publica Freud en las pampas. Orígenes y desarrollo de una cultura psicoanalítica en la Argentina (1910-1983: un estudio minucioso de la recepción y difusión del psicoanálisis que recupero tanto en sus aspectos metodológicos como en sus conjeturas sobre la relación que los intelectuales argentinos suelen entablar con el pensamiento europeo (tesis que se refuerzan si se las lee en conjunción con las desarrolladas respecto de lo que ha acontecido en el campo de los estudios literarios en nuestro país entre la segunda mitad del siglo XX hasta la fecha –cf. Gerbaudo, 2006a, 2007a, 2007b-. Plotkin pone la descripción de la masiva difusión del psicoanálisis en Argentina en el corte temporal seleccionado al servicio del estudio de los factores culturales, sociales y políticos que hicieron lugar a esa acogida.

  11. Pampa Húmeda, Argentina

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    Néstor C. Di Leo

    2007-01-01

    Full Text Available La radiación fotosintéticamente activa (PAR es importante como variable de entrada de energía en diversos procesos biológicos y su evaluación temporal tiene particular interés en el monitoreo de cultivos. Los datos de reflectancia espectral, obtenidos mediante sensores remotos, son adecuados para proporcionar observaciones de fenómenos que se relacionan con aspectos ecofisiológicos de las cubiertas vegetales, incluyendo a la productividad primaria neta (NPP. Ésta constituye una de las pocas fuentes de información acerca de los procesos del ciclo del carbono en escalas regionales o globales. La NPP se relaciona con la eficiencia del uso de la luz a través de la radiación fotosintéticamente activa absorbida (APAR y representa un indicador agroecológico de utilidad para valorar la utilización productiva del territorio. El objetivo de este trabajo es presentar un aporte metodológico a la agroecología, mediante las caracterizaciones de la NPP y la APAR, en tres situaciones geográficas y productivas de la Pampa Húmeda, Argentina.

  12. Pampas Grass - Orange Co. [ds351

    Data.gov (United States)

    California Natural Resource Agency — This dataset provides the known distribution of pampas grass (Cortaderia selloana) in southern Orange County. The surveys were conducted from May to June, 2007 and...

  13. Distribución de poros en una ladera de pampa ondulada cultivada con siembre directa Pore distribution on a hillslope under direct sowing in the rolling Pampa region of Argentina

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    Mario Castiglioni

    2010-12-01

    Full Text Available Para seleccionar las opciones de manejo mas adecuadas en suelos erosionados, es imprescindible identificar primeramente que atributos edáficos son modificados a partir de dicho proceso de degradación. El objetivo del presente trabajo fue determinar el efecto del diferente grado de erosión hídrica en un Argiudol Vértico cultivado con siembra directa, sobre la distribución de poros a dos profundidades (0-5 cm y 5-10 cm. La toma de muestras se realizó sobre tres transectas paralelas siguiendo la dirección de la pendiente. En cada una de ellas y a intervalos de 8 m se determinó el volumen que ocuparon distintas clases por tamaño de poro, la porosidad total y la profundidad al horizonte argílico. También se cuantificó en distintos puntos del área de trabajo la textura de los dos estratos estudiados. Si bien en el área bajo estudio la profundidad al horizonte argílico fluctuó entre 32 y 19 cm y el contenido de arcilla tuvo variaciones del 22,6 (0-5 cm y 28,0% (5-10 cm, no se observaron diferencias significativas en el volumen ocupado por las distintas categorías de poro estudiadas entre suelos con distinto grado de erosión. Al realizar un reagrupamiento de las observaciones de acuerdo a su porosidad total, se evidenció en cada estrato que las situaciones con mayor porosidad total presentaron un mayor volumen (PIn order to select the most appropriate management techniques for eroded soils it is essential to first of all identify those soil attributes modified by this degradation process. The aim of this study was to determine the effect of different degrees of water erosion in a Vertic Argiudoll under direct sowing on the distribution of pores at two depths (0-5 cm and 5-10 cm. Sampling was carried out in three parallel transects in the slope direction. The volume occupied by different pore-size classes, total porosity and depth to the argilic horizon were measured at 8 m-intervals in each transect. Soil texture was also measured at the two depths in different sections of the study area. The depth of the argilic horizon ranged between 32 and 19 cm and clay content varied between 22.6 (0-5 cm and 28.0% (5-10 cm. However, no significant differences were found in the volume occupied by different pore-size classes between soils with varying degrees of erosion. Grouping the findings in terms of total porosity shows that greater porosity in each stratum is associated with a higher total volume (P< 0.05 of pores larger than 51 µm.

  14. The Brazilian Pampa: A Fragile Biome

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    Valdir Marcos Stefenon

    2009-12-01

    Full Text Available Biodiversity is one of the most fundamental properties of Nature. It underpins the stability of ecosystems, provides vast bioresources for economic use, and has important cultural significance for many people. The Pampa biome, located in the southernmost state of Brazil, Rio Grande do Sul, illustrates the direct and indirect interdependence of humans and biodiversity. The Brazilian Pampa lies within the South Temperate Zone where grasslands scattered with shrubs and trees are the dominant vegetation. The soil, originating from sedimentary rocks, often has an extremely sandy texture that makes them fragile—highly prone to water and wind erosion. Human activities have converted or degraded many areas of this biome. In this review we discuss our state-of-the-art knowledge of the diversity and the major biological features of this regions and the cultural factors that have shaped it. Our aim is to contribute toward a better understanding of the current status of this special biome and to describe how the interaction between human activities and environment affects the region, highlighting the fragility of the Brazilian Pampa.

  15. Preparing for floods on Argentina's Pampas | IDRC - International ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    2016-05-04

    May 4, 2016 ... Climate change is expected to bring more frequent extreme weather events to the region. ... improve the prediction and management of floods on the Pampas. This article, featured in the May 2011 issue of Ecohydrology, ...

  16. Reproductive biology of the pampas deer (Ozotoceros bezoarticus: a review

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    Olazabal Daniel

    2008-06-01

    Full Text Available Abstract The pampas deer (Ozotoceros bezoarticus is a South American grazing deer which is in extreme danger of extinction. Very little is known about the biology of the pampas deer. Moreover, most information has not been published in peer-reviewed scientific journals, and is only available in local publications, theses, etc. Therefore, our aim was to update and summarize the available information regarding the reproductive biology of the pampas deer. Moreover, in most sections, we have also included new, unpublished information. Detailed descriptions are provided of the anatomy of both the female and the male reproductive tract, puberty onset, the oestrous cycle and gestational length. Birthing and the early postpartum period are described, as are maternal behaviour and early fawn development, seasonal distribution of births, seasonal changes in male reproduction and antler cycle, reproductive behaviour, semen collection, and cryopreservation. Finally, an overview is given and future directions of research are proposed.

  17. Aspectos de los sobrenatural en Pampas-La Florida (Chancay

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    Isabelle Lausent

    1984-12-01

    Full Text Available La Pacarina del pueblo de "San Salvador del Mundo" de Pampas (valle de Chancay es el cerro Mango. Las repetidas Extirpaciones de Idolatría que sufrieron "sus hijos", el mestizaje y el transcurso del tiempo han, poco a poco, hecho desaparecer los mitos que frataban del Mango. La tradición oral de Pampas que da mucha importercia al mundo de lo sobrenatural sigue, sin embargo, ofreciendo numerosos cuentos y leyendas mencionando este cerro ya no como pacarina sino como una mina fuente de riqueza y lugar de encanto.El análisis que sigue ha sido realizado a partir de Ics cuentos recopilados por Jorgc Osterling durante la Semana Santa del año de 1980 en el rnismo Pampas La Florida.

  18. Notas sobre el paisaje de Huánuco Pampa

    OpenAIRE

    Román Godines, Oscar; Ministerio de Cultura

    2013-01-01

    El complejo arqueológico Huánuco Pampa se encuentra ubicado en la provincia Dos de Mayo en el departamento de Huánuco y en la actualidad es quizás el principal vestigio de la cosmovisión y la planificación urbana inca.

  19. Alimentos diferenciados: atributos de calidad que inciden en la elección del consumidor

    OpenAIRE

    Lacaze, María Victoria; Lupín, Beatriz; Rodríguez, Elsa Mirta M.

    2005-01-01

    La mayoría de los mercados de alimentos son asimétricos en cuanto a la información disponible respecto de la calidad de los productos. La calidad percibida afecta las decisiones de consumo de alimentos diferenciados. El objetivo del Trabajo es indagar cuáles son los atributos que inciden consumo de dichos alimentos. La información proviene de una encuesta relevada a consumidores en la Ciudad de Buenos Aires, durante abril de 2005. La aplicación de un Modelo Logístico estaría indicando que los...

  20. Cáncer diferenciado de Tiroides. ¿Porqué está aumentando su frecuencia?.

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    Alfredo Jácome Roca

    2015-06-01

    Full Text Available Aunque el cáncer de tiroides ocupa un porcentaje menor de los casos de cáncer, no dejan de presentarse un buen número de casos. En su gran mayoría se trata de cánceres diferenciados (papilar y folicular, con buen pronóstico y excelente supervivencia. En décadas recientes se ha notado un incremento mundial de cánceres papilares, aunque con pocas excepciones, se trata de carcinomas muy pequeños, llamados microcarcinomas o carcinomas ocultos. Con el objeto de destacar los aspectos más relevantes de estos tumores y tangencialmente de los cánceres tiroideos pobremente diferenciados o indiferenciados, presentamos esta revisión que también discute las indicaciones conservadoras o citorreductivas de los tratamientos quirúrgicos y otros de naturaleza ablativa. La casuística nacional es cada vez más importante.

  1. Concomitância da tireoidite de Hashimoto e o carcinoma diferenciado da tireóide

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    Alexandre Roberti

    Full Text Available OBJETIVO: Avaliar a associação da tireoidite auto-imune e o carcinoma diferenciado da tireóide na Santa Casa de Misericórdia de Goiânia-Goiás. MÉTODO: De 1395 tireoidectomias realizadas de 1994 a 2003, foram selecionadas 120 carcinomas diferenciados (27 foliculares e 93 papilíferos. Foram avaliadas as variáveis clínicas (idade e sexo com apresentação de freqüências e de sumários de medidas-resumo na descrição estatística. Para aferir a associação de tireoidite auto-imune e carcinoma diferenciado da tireóide em função dos achados histopatológicos, utilizou-se tabelas de contingência e análise pelo teste não paramétrico do quiquadrado de Pearson. Em todos os testes estatísticos foi adotado um nível de significância de 5% (p<0,05. RESULTADOS: 11,1% dos carcinomas foliculares e 18,3% dos carcinomas papilíferos estão associados à tireoidite auto-imune. Existe uma relação de freqüências quatro vezes maior da tireoidite auto-imune com o carcinoma diferenciado da tireóide em comparação com outras doenças tireoideanas (16,7% X 3,6%. CONCLUSÕES: Tais resultados permitem inferir que a associação entre a tireoidite auto-imune e o carcinoma diferenciado da tireóide é mais que casual, exigindo uma observação clínico-laboratorial cuidadosa nos portadores da doença auto-imune.

  2. EFECTOS A LARGO PLAZO DE LA LABRANZA CONVENCIONAL Y LA SIEMBRA DIRECTA SOBRE LAS PROPIEDADES FÍSICAS DE UN ARGIUDOL TÍPICO DE LA PAMPA ONDULADA ARGENTINA LONG TERM EFFECTS OF NO TILLAGE AND CONVENTIONAL TILLAGE IN A TYPIC ARGIUDOLL OF THE ARGENTINA ROLLING PAMPA

    Directory of Open Access Journals (Sweden)

    Ramiro Ramírez Pisco

    2006-06-01

    Full Text Available Una creciente proporción de argiudoles franco limosos es manejada con siembra directa, lo cual genera incertidumbre en cuanto a la posible evolución a largo plazo de las propiedades físicas. En Pergamino, el INTA posee ensayos de labranzas donde los suelos son manejados con labranza convencional (LC y con siembra directa (SD continua desde hace 16 años. En estas parcelas fueron evaluadas la densidad aparente (cilindro, la resistencia (medida en laboratorio a distintos contenidos hídricos, la distribución de tamaño de poros (desorción de agua en mesa de tensión, la conductividad hidráulica saturada K sat (cilindros en laboratorio, y la estabilidad de agregados. Los resultados fueron comparados con un suelo no degradado (reserva botánica. Los parámetros más sensibles fueron la conductividad hidráulica y la inestabilidad de agregados cuyos valores fueron respectivamente de 1,41- 0,16 mm h-1 y 2,78 mm bajo LC, y de 23,61- 4,61 mm h-1 y 1,07 mm bajo SD. En este tratamiento el suelo recuperó su distribución original bimodal de poros, con prevalecía de las clases > 100 mm y 50- 20 mm.No tillage is applied to an increasing proportion of silty loam argiudolls. little is known about the possible longterm evolution of soil physical properties. In Pergamino, INTA has 16 yr field trials for comparing soil behavior under longterm conventional tillage (CT and no tillage (NT. In these treatments soil bulk density (cores, resistance (measured in the laboratory at different water contents, pore size distribution (water desorption in the tension table, saturated hydraulic conductivity, K sat (measured in the laboratory, and aggregate instability were determined. Results were compared to a nondegraded condition (a botanic reserve. Soil K sat and aggregate instability were the most sensitive parameters, which were respectively 1,41 - 0,16 mm h-1 and 1,07 mm under CT and 23,61 - 4,61 mm h-1 and 1,07 mm under NT. In this treatment soil recovered its original bimodal pore size distribution, which peaked in the > 100 μm and 50 - 20 μm pore size classes.

  3. Multicentricidade no carcinoma diferenciado da tireóide Multicentricity in the thyroid differentiated carcinoma

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    José Francisco Salles Chagas

    2009-02-01

    Full Text Available O tratamento cirúrgico de escolha no carcinoma diferenciado da tireóide sempre foi controverso. OBJETIVO: Analisar o acometimento tumoral do lobo contralateral da tireóide no carcinoma diferenciado, correlacionando risco e benefício com as complicações decorrentes da segunda intervenção. CASUÍSTICA E MÉTODO: Estudo retrospectivo, de 1998 a 2006, com 27 pacientes submetidos à tireoidectomia menos que total, sendo 21 lobectomias, cinco tireoidectomias subtotais e uma istmectomia. Foram analisados: gênero, idade, tipo de cirurgia, complicações, histopatológico do espécime cirúrgico e invasão do lobo contralateral. As idades variaram de 17 a 89 anos; o tipo histopatológico mais freqüente foi o carcinoma papilífero clássico (18 casos, seguido do carcinoma folicular (seis casos, do carcinoma papilífero variante folicular (dois casos e do carcinoma de células Hürthle (um caso. Vinte e um pacientes foram submetidos à totalização da tireoidectomia, 15 a 30 dias depois. RESULTADOS: A análise do lobo contralateral foi negativa para carcinoma em 16 (76,5% e positiva nos cinco restantes (23,8%. As complicações observadas foram: disfonia temporária (três casos e hipoparatireoidismo (dois casos, sendo um permanente. CONCLUSÃO: A totalização da tireoidectomia é um procedimento importante no tratamento do carcinoma bem diferenciado da tireóide pelo elevado acometimento contralateral (23,8%. A incidência de complicações é pequena.The treatment of choice for the well differentiated thyroid carcinoma has always been controversial. AIM: to analyze tumor invasion of the thyroid gland's contralateral lobe in cases of differentiated carcinoma, correlating risk/benefit with the complications of a second surgical approach. MATERIALS AND METHODS: Retrospective study, from 1998 to 2006, of 27 patients undergoing less than total thyroidectomy: lobectomy (21, subtotal thyroidectomy (5 or isthmusectomy (1. Gender, age, type of surgery

  4. Adaptação de produtos para mercados diferenciados a partir da engenharia reversa

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    Luiz Gilberto Monclaro Mury

    2001-12-01

    Full Text Available Um dos maiores desafios das empresas exportadoras está na identificação e atendimento, de forma dinâmica, às exigências de mercados externos. Neste artigo, propõe-se uma metodologia para melhoria e adaptação de produtos destinados a mercados diferenciados. A metodologia, implementada em oito passos estruturados, parte de conceitos da Engenharia Reversa e seus habilitadores, bem como de ferramentas para melhoria de processos, tais como QFD - Quality Function Deployment, Cartas de Processo e FMEA - Failure Mode and Effects Analysis. A metodologia proposta é aplicada em um caso prático, onde o objetivo é adaptar um pincel brasileiro às demandas de um distribuidor alemão de ferramentas manuais.Rapid identification and compliance to customized market demands are among the top challenges faced by companies targeting at foreign markets, in this paper we propose an eight-step method for the adaptation and improvement of industrialized products driven by customer demands. The method we propose is grounded on Reverse Engineering principles and process improvement techniques, such as Quality Function Deployment, Process Mapping and Failure Mode and Effects Analysis. The method steps are illustrated by a case example, where the objective is to adapt a paintbrush manufactured by a Brazilian company to the demands of a German distributor of manual tools.

  5. Arsenic in Water Resources of the Southern Pampa Plains, Argentina

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    Juan D. Paoloni

    2009-01-01

    Full Text Available Confronted with the need for accessible sources of good quality water and in view of the fact that the threat to public health posed by arsenic occurs mainly through the ingestion of contaminated drinking water, the presence and distribution of arsenic was evaluated in the southern Pampa Plains of Bahía Blanca district in Argentina. The findings show variable concentrations of arsenic in a complex distribution pattern. Complementary information is provided on the behavior of the groundwater resource and its salinity in terms of dissolved ions. Groundwater is the most severely affected, 97% of the samples exceeding the guideline value for arsenic in drinking water as recommended by the WHO (Guidelines for Drinking Water Quality, 2004. and showing maximum concentrations of up to 0.30 mg/L. Informing those responsible for preventive medicine and alerting the community at large will facilitate measures to mitigate exposure and ensure the safety of drinking water.

  6. Arsenic in Water Resources of the Southern Pampa Plains, Argentina

    Science.gov (United States)

    Paoloni, Juan D.; Sequeira, Mario E.; Espósito, Martín E.; Fiorentino, Carmen E.; Blanco, María del C.

    2009-01-01

    Confronted with the need for accessible sources of good quality water and in view of the fact that the threat to public health posed by arsenic occurs mainly through the ingestion of contaminated drinking water, the presence and distribution of arsenic was evaluated in the southern Pampa Plains of Bahía Blanca district in Argentina. The findings show variable concentrations of arsenic in a complex distribution pattern. Complementary information is provided on the behavior of the groundwater resource and its salinity in terms of dissolved ions. Groundwater is the most severely affected, 97% of the samples exceeding the guideline value for arsenic in drinking water as recommended by the WHO (Guidelines for Drinking Water Quality, 2004). and showing maximum concentrations of up to 0.30 mg/L. Informing those responsible for preventive medicine and alerting the community at large will facilitate measures to mitigate exposure and ensure the safety of drinking water. PMID:19936127

  7. Arsenic in Water Resources of the Southern Pampa Plains, Argentina

    International Nuclear Information System (INIS)

    Paoloni, J.D.; Sequeira, M.E.; Esposito, M.E.; Fiorentino, C.E.; Blanco, M.D.C.

    2010-01-01

    Confronted with the need for accessible sources of good quality water and in view of the fact that the threat to public health posed by arsenic occurs mainly through the ingestion of contaminated drinking water, the presence and distribution of arsenic was evaluated in the southern Pampa Plains of Bahia Blanca district in Argentina. The findings show variable concentrations of arsenic in a complex distribution pattern. Complementary information is provided on the behavior of the groundwater resource and its salinity in terms of dissolved ions. Groundwater is the most severely affected, 97% of the samples exceeding the guideline value for arsenic in drinking water as recommended by the Who (Guidelines for Drinking Water Quality, 2004). and showing maximum concentrations of up to 0.30 mg/L. Informing those responsible for preventive medicine and alerting the community at large will facilitate measures to mitigate exposure and ensure the safety of drinking water.

  8. Concomitância da tireoidite de Hashimoto e o carcinoma diferenciado da tireóide

    OpenAIRE

    Roberti, Alexandre; Andrade Sobrinho, Josias de; Denardin, Odilon Victor Porto; Rapoport, Abrão

    2006-01-01

    OBJETIVO: Avaliar a associação da tireoidite auto-imune e o carcinoma diferenciado da tireóide na Santa Casa de Misericórdia de Goiânia-Goiás. MÉTODO: De 1395 tireoidectomias realizadas de 1994 a 2003, foram selecionadas 120 carcinomas diferenciados (27 foliculares e 93 papilíferos). Foram avaliadas as variáveis clínicas (idade e sexo) com apresentação de freqüências e de sumários de medidas-resumo na descrição estatística. Para aferir a associação de tireoidite auto-imune e carcinoma diferen...

  9. Changes in Average Annual Precipitation in Argentina’s Pampa Region and Their Possible Causes

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    Silvia Pérez

    2015-01-01

    Full Text Available Changes in annual rainfall in five sub-regions of the Argentine Pampa Region (Rolling, Central, Mesopotamian, Flooding and Southern were examined for the period 1941 to 2010 using data from representative locations in each sub-region. Dubious series were adjusted by means of a homogeneity test and changes in mean value were evaluated using a hydrometeorological time series segmentation method. In addition, an association was sought between shifts in mean annual rainfall and changes in large-scale atmospheric pressure systems, as measured by the Atlantic Multidecadal Oscillation (AMO, the Pacific Decadal Oscillation (PDO and the Southern Oscillation Index (SOI. The results indicate that the Western Pampas (Central and Southern are more vulnerable to abrupt changes in average annual rainfall than the Eastern Pampas (Mesopotamian, Rolling and Flooding. Their vulnerability is further increased by their having the lowest average rainfall. The AMO showed significant negative correlations with all sub-regions, while the PDO and SOI showed significant positive and negative correlations respectively with the Central, Flooding and Southern Pampa. The fact that the PDO and AMO are going through the phases of their cycles that tend to reduce rainfall in much of the Pampas helps explain the lower rainfall recorded in the Western Pampas sub-regions in recent years. This has had a significant impact on agriculture and the environment.

  10. Redescripción de la obrera de Myrmelachista gallicola (Hymenoptera: Formicidae y primera cita para la provincia de La Pampa (Argentina Redescription of the worker of Myrmelachista gallicola (Hymenoptera: Formicidae and first record from La Pampa (Argentina

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    Estela M. Quirán

    2006-12-01

    Full Text Available Se redescribe la obrera de Myrmelachista gallicola Mayr y se cita por primera vez para la provincia de La Pampa (Argentina. El material estudiado está compuesto por obreras y fue recolectado sobre Prosopis caldenia Burkart (Fabaceae, dentro de las agallas de Tetradiplosis sp. (Diptera: Cecidomyiidae, en la periferia de la ciudad de Santa Rosa, provincia de La Pampa.The worker of Myrmelachista gallicola Mayr is redescribed and mentioned for the first time for La Pampa province (Argentina. The material studied was integrated by workers and was collected on Prosopis caldenia Burkart (Fabaceae at Santa Rosa, La Pampa within galls of Tetradiplosis sp. (Diptera: Cecidomyiidae.

  11. Relatedness and social organization of coypus in the Argentinean pampas

    Science.gov (United States)

    Tunez, J.I.; Guichon, M.L.; Centron, D.; Henderson, A.P.; Callahan, C.; Cassini, M.H.

    2009-01-01

    Behavioural and trapping studies of the social organization of coypus have suggested the occurrence of kin groups and a polygynous mating system. We used 16 microsatellite markers to analyse parentage and relatedness relationships in two populations (J??uregui and Villa Ruiz) in the Argentinean Pampas. At J??uregui, a dominant male monopolized most paternities, leading to a high variance in reproductive success between males and a high level of polygyny. At Villa Ruiz, variance in reproductive success was low among resident males and males were the fathers of zero to four offspring each. For females, no significant differences were found. Two different social groups in each study site were used to assess genetic relatedness within and between groups. These groups were neighbouring at J??uregui but not at Villa Ruiz. At Villa Ruiz, coypus were significantly more related within than between groups, suggesting that behavioural groups were also genetic ones, and adult females were more related within than between groups, as should be expected for kin groups. This relationship was not found at J??uregui. Our results provide support to previous studies based on behavioural and trapping data, which indicate that coypus form social groups and have a polygynous mating system. However, we found differences in social organization between the two populations. This is the first study to determine parentage and/or relatedness in coypus. ?? 2008 The Authors.

  12. Utilization of satellite images to understand the dynamics of Pampas shallow lakes

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    V. S. Aliaga

    2016-06-01

    Full Text Available The aim of this study was to analyze satellite images of different spatial resolutions to interpret the morphometric behavior of six shallow lakes of the Pampas, Argentina. These are characterized by having different rainfall regimes. Morphometric response considering each location, site conditions and dry and wet extreme events is analyzed. Standardized Precipitation Index (IEP for determination of wet, dry and normal years was used. This analysis showed that the Pampas shallow lakes do not behave in the same way to the rainfall events. Its origin, socio-economic use and rainfall patterns affect their spatiotemporal variation and morphometric.

  13. Prevalence and spatial distribution of bovine brucellosis in San Luis and La Pampa, Argentina.

    Science.gov (United States)

    Aznar, M N; Linares, F J; Cosentino, B; Sago, A; La Sala, L; León, E; Duffy, S; Perez, A

    2015-08-15

    Bovine brucellosis (BB) is a zoonotic disease caused by Brucella abortus. BB is endemic in Argentina, where vaccination with Brucella abortus strain 19 is compulsory for 3-to-8 month-old heifers. The objectives of this study were to quantify the prevalence of BB and to identify factors associated with its occurrence, along with the spatial distribution of the disease, in the provinces of La Pampa and San Luis. A two-stage random sampling design was used to sample 8,965 cows (3,513 in La Pampa and 5,452 in San Luis) from 451 farms (187 in La Pampa and 264 in San Luis). Cow and herd prevalence were 1.8 % (95 % CI: 1.3-2.2; n = 157) and 19.7 % (95 % CI: 17.0-22.4; n = 89), respectively. Both cow-level and herd-level prevalence in La Pampa (2.4 and 26.0 %, respectively) were significantly higher than in San Luis (1.4 and 15.5 %, respectively). There were not differences between the proportions of reactive cattle compared to that obtained in a survey conducted in 2005. However, herd prevalence in La Pampa was significantly (P < 0.05) higher compared to that study. Disease was found to be spatially clustered in west La Pampa. The lower the bovine density and the calf/cow ratio, the higher odds of belonging to the cluster. The increase of farm prevalence in the last five years suggests that the disease is spreading and that control measures should be applied in the region. The cluster of infected farms was located in the west region of La Pampa. There, farms have lower animal densities and smaller cow/calf indices compared to the rest of the province. Although western La Pampa has more infected herds, within-farm prevalence was not higher, which suggests that the control program has been relatively successful in controlling the disease at the farm level, and/or that low animal density inherently results in low disease prevalence. Our results provide baseline information on the epidemiology of BB and its potential pattern of transmission in Argentina, which will ultimately

  14. Water balance in paired watersheds with eucalyptus and degraded grassland in Pampa biome

    Science.gov (United States)

    Rangelands of the Pampa biome, which cover regions of Argentina, Uruguay and Brazil (176,496 km2 – 2.07% of Brazilian territory and 63% of Rio Grande do Sul State territory, southern region of Brazil) in South America (total area of 750,000 km2), are being substituted by crops and commercial eucalyp...

  15. Mulher, Pampa e natureza: um olhar através de contos puebleros

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    Juliana Corrêa Pereira Schlee

    2016-12-01

    Full Text Available O presente trabalho é um estudo em andamento que se detém nos contos puebleros para deslocar o olhar sobre a mulher, o Pampa e a natureza. Assim, busco a Educação Ambiental, como campo de saber importante e potente para a análise de mundo que temos em seu processo de construção cultural moderno. Entendendo a literatura como pedagogia cultural para problematizar como nos constituímos mulher no Pampa e como nos relacionamos com o discurso de natureza. O Pampa para pensar além de um território geográfico, mas como um lugar que é constituído pelos diversos atravessamentos: biológicos, geográficos, culturais, econômicos, políticos. Modos de ver o mundo, viver e narrar a natureza. Fabricações  histórica e socialmente constituídos em diferentes culturas e em diferentes épocas. É preciso pensar sobre as universalidades de ser mulher, assim como suas relações com a natureza e o pampa.

  16. Nuevos centros de almacenamiento inca en Huánuco Pampa

    OpenAIRE

    Ordóñez Inga, Carlo José Alonso

    2013-01-01

    Se proporcionan nuevos alcances sobre la identificación y el estudio de nuevos lugares de almacenamiento o colcas asociados al Centro Administrativo Inca de Huánuco Pampa, los mismos que no fueron reconocidos por otros investigadores que trabajaron en la zona.

  17. A new species of Andocaeculus (Acari, Caeculidae) from the Pampa biome, southern Brazil

    OpenAIRE

    Ana Paula Ott; Ricardo Ott

    2014-01-01

    A new caeculid species Andocaeculus caioi sp. nov. is described from Pampa biome in south Brazil. The species of this family are usually large and strong sclerotized mites with robust and spinulose legs I and II. Until now records of species for South America were known only from Chile and Argentina.

  18. Rickettsia parkeri in Amblyomma dubitatum ticks in a spotted fever focus from the Brazilian Pampa.

    Science.gov (United States)

    Weck, Bárbara; Dall'Agnol, Bruno; Souza, Ugo; Webster, Anelise; Stenzel, Bárbara; Klafke, Guilherme; Martins, João Ricardo; Reck, José

    2017-07-01

    Spotted fever is an acute febrile illness, which is considered severely underreported and misdiagnosed in the Brazilian Pampa, caused by tick-borne Rickettsiae. Here, we report an eco-epidemiological investigation of Rickettsia spp. in ticks from a spotted fever focus in Toropi, southern Brazil. Ticks were collected from capybara carcasses and processed individually to obtain genomic DNA. Rickettsia was investigated using PCR that amplified the rickettsial fragments of the gltA, ompA and htrA genes. DNA from Rickettsia parkeri was found in four of 14 Amblyomma dubitatum ticks collected from capybara carcasses in Toropi and the nearby municipality of Quevedos. We also tested 210A. dubitatum ticks obtained from road-killed capybaras of other localities from the Pampa biome; none of them were positive for Rickettsiae. Thus, in Rio Grande do Sul, two Rickettsia species can be potentially associated to spotted fever: Rickettsia sp. strain Atlantic Rainforest, associated with Amblyomma ovale ticks in the Atlantic Rainforest biome, and R. parkeri, associated both with Amblyomma tigrinum and A. dubitatum ticks in the Pampa biome. Our results reinforce that R. parkeri may be the agent associated with spotted fever in the Brazilian Pampa. Copyright © 2017 Elsevier B.V. All rights reserved.

  19. Land use change and ecosystem service provision in Pampas and Campos grasslands of southern South America

    NARCIS (Netherlands)

    Modernel Hristoff, Pablo; Rossing, W.A.H.; Corbeels, M.; Dogliotti, S.; Picasso, V.; Tittonell, P.

    2016-01-01

    New livestock production models need to simultaneously meet the increasing global demand for meat and preserve biodiversity and ecosystem services. Since the 16th century beef cattle has been produced on the Pampas and Campos native grasslands in southern South America, with only small amounts of

  20. Social wasps (Polistinae from Pampa Biome: South Brazil, Northeastern Argentina and Uruguay

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    Alexandre Somavilla

    2017-08-01

    Full Text Available Abstract. This study aimed to determine social wasps’ species from Pampa Biome. Were examined samples of social wasps from south-central of Rio Grande do Sul state (Brazil, parts of Buenos Aires, Entre Rios, Corrientes, Cordoba, Santa Fé and La Pampa provinces (Argentina and in Uruguay maintained in the Coleção Entomológica de Santa Cruz do Sul (Santa Cruz do Sul-Brazil, American Museum of Natural History (USA, Natural History Museum (London-United Kingdom and Muséum National d’Histoire Naturelle (Paris-France. Thirty species were recorded: Agelaia (01, Brachygastra (01, Mischocyttarus (04, Polistes (15, Polybia (08 and Protonectarina (01. Vespas sociais do Bioma Pampa: sul do Brasil, nordeste da Argentina e Uruguai. Resumo. Este estudo objetivou determinar as espécies de vespas sociais provenientes do Bioma Pampa. Foram examinadas vespas sociais provenientes de coletas da região centro-sul do Rio Grande do Sul (Brasil, parte das províncias de Buenos Aires, Entre Rios, Corrientes, Cordoba, Santa Fé e La Pampa (Argentina e Uruguai depositadas na Coleção Entomológica de Santa Cruz do Sul (Santa Cruz do Sul-Brasil, American Museum of Natural History (Nova Iorque-USA, Natural History Museum (Londres-Reino Unido e Muséum National d’Histoire Naturelle (Paris-França. Trinta espécies foram registradas: Agelaia (01, Brachygastra (01, Mischocyttarus (04, Polistes (15, Polybia (08 e Protonectarina (01.

  1. Carcinoma diferenciado da tireóide: a validade da complementação da tireoidectomia

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    José Luís Braga de Aquino

    Full Text Available OBJETIVO: Analisar a invasão tumoral do lobo contralateral da glândula tireóide no carcinoma diferenciado, correlacionando o risco/benefício com as complicações decorrentes de uma segunda intervenção. MÉTODO: De outubro/93 a dezembro/96 foram operados 20 pacientes com carcinomas diferenciados da glândula tireóide. Os parâmetros analisados foram sexo, idade, tipo de operação, tipo de complicações, histopatológico da peça cirúrgica e invasão do lobo contralateral. Eram dois pacientes do sexo masculino (10% e 18 do feminino (90%; as idades variaram de 17 a 89 anos; o tipo histológico mais freqüente foi o carcinoma papilífero (13 casos, seguido do folicular (seis casos e carcinoma de células de Hürthle (um caso. Como primeiro procedimento cirúrgico houve 11 lobectomias + istmectomias, quatro lobectomias subtotais e uma istmectomia. Cinco pacientes não realizaram a totalização (um por fibrose, três por perda de seguimento e um por ser microcarcinoma. RESULTADOS: Na análise do lobo contralateral realizada em 15 pacientes, 11 resultaram negativas e outras quatro positivas (26,6%. As complicações apresentadas foram rouquidão (dois casos revertidos com tratamento fonoterápico, hipoparatireoidismo (dois casos, um transitório e um permanente. CONCLUSÃO: A totalização da tireoidectomia é um procedimento importante no tratamento do tumor maligno da tireóide pela alta porcentagem de metástase contralateral (26,6%. Além disso, é um procedimento com mortalidade nula e pequena incidência de complicações.

  2. Teresa Zweifel, Medir lo inconmensurable. Los cambios en los procedimientos para relevar la pampa anterior (1796-1895

    Directory of Open Access Journals (Sweden)

    Sandra Szir

    2015-09-01

    Full Text Available Reseña bibliográfica del libro de Teresa Zweifel, Medir lo inconmensurable. Los cambios en los procedimientos para relevar la pampa anterior (1796-1895, Rosario, Prohistoria Ediciones, 2014, 191 pp.

  3. EL ROSTRO OCULTO DE ESPÍRITU PAMPA, VILCABAMBA, CUSCO (Avance/Advance

    Directory of Open Access Journals (Sweden)

    Javier Fonseca Santa Cruz

    2011-06-01

    Full Text Available Recent archaeological studies carried out in the Vilcabamba region, northwest of Cusco, resulted in the unprecedented discovery of an elite Wari burial at the site of Espíritu Pampa. This finding is unique in many respects: first, rich burials belonging to the Wari State have not been excavated scientifically; second, this is the first tangible evidence for the existence of high rank individuals within the Wari State; and third, this finding is the first of its kind coming from the tropical rain forest region. In this report, I describe the main finding coming from Espíritu Pampa, thus making available the new data to the scientific community.

  4. BIOMA PAMPA: TEMA GERADOR EM UMA ATIVIDADE INTERDISCIPLINAR PARA EDUCAÇÃO AMBIENTAL

    OpenAIRE

    Delabary, Barési Freitas; Guerra, Rafael Sanches; Garcia, Taís da Silva; Bastiani, Tânia Mara de

    2011-01-01

    A fim de mostrar que é possível ter uma atividade interdisciplinar com áreas de conhecimento diferentes, este trabalho tem como objetivo principal abordar o bioma pampa dentro de quatro áreas distintas visando contribuir para a Educação Ambiental. Cada profissional descreverá tendo por base a pesquisa bibliográfica, como é possível trabalhar o bioma pampa dentro da sua área de atuação. O biólogo abordará o bioma sob a perspectiva descritiva (localização, extensão, tipo de fauna, flora, animai...

  5. Historical balance of nitrogen, phosphorus, and sulfur of the Argentine Pampas

    OpenAIRE

    Álvarez, Roberto; Steinbach, Haydee S; de Paepe, Josefina L

    2016-01-01

    A surface balance for nitrogen (N), phosphorus (P), and sulfur (S) was performed for the Argentine Pampas during the 1870-2010 time interval, comprising the agricultural expansion period in the region. Nitrogen inputs accounted in the balance were atmospheric deposition, symbiotic fixation, and fertilization. Outputs included were grain harvest and livestock products. P and S balances included atmospheric deposition and fertilization as inputs and the same outputs than in the case of N balanc...

  6. Record of the Buff-fronted Owl (Aegolius harrisii in the Pampa Biome, southern Brazil

    Directory of Open Access Journals (Sweden)

    Marluci Müller Rebelato

    2011-02-01

    Full Text Available We present the second record of the Buff-fronted Owl (Aegolius harrisii in the Pampa Biome, South Brazil. On 17 January 2010 an adult male was found dead at the roadside along the BR-290, São Gabriel municipality, center-east of Rio Grande do Sul state. The specimen probably collided with a car when using the area for foraging. The record reported here agrees with the suggestion that A. harrisii can use disturbed and open areas.

  7. Model to the evolution of the organic matter in the pampa's soil. Relation with cultivation systems

    International Nuclear Information System (INIS)

    Andriulo, Adrian; Mary, Bruno; Guerif, Jerome; Balesdent, Jerome

    1996-08-01

    The objective of the work is to present a model to describe the evolution of the organic matter in soils of the Argentine's pampa. This model can be utilised to evaluate the evolution of the soil's fertility in the agricultural production at this moment. Three kinds of assay were done. The determination of organic carbon made possible to prove the Henin-Dupuis model and a derived model

  8. Use of fertilizer nitrogen by wheat in semiarid region of the pampa, Argentina

    International Nuclear Information System (INIS)

    Lazzari, M.A.; Laurent, G.C.

    1984-01-01

    The efficiency of nitrogen utilization by wheat (Buck Pucara cultivar) in semiarid region of the Argentina Pampas is studied. A single-treatment-fertility-experimet is used, and in this method all treatments, as far as the plant, soil or environment are concerned, are identical. The only difference is the occurrence of the 15 N label within a given subtreatment. (M.A.C.) [pt

  9. Human Rights in the Training of Teachers. Paradigmatic Femicides in the Province of La Pampa, Argentina

    Directory of Open Access Journals (Sweden)

    Silvia Siderac

    2017-09-01

    Full Text Available This article gives an account of the experiment carried out on the basis of the photographic exhibition “The violence in focus. Three paradigmatic femicides in La Pampa" that was carried out in the interior of the educational community of the Faculty of Sciences at the National University of La Pampa (UNLPam, together with the feminist organization "Women for Solidarity" in the framework of a cultural program of the Ministry of Culture and Extension of the UNLPam. The people who took part in this activity were teachers of the Faculty of Sciences and students from various undergraduate courses. The objectives of the sample were to build an educational space in relation with human rights, to make visible the three femicides of Pampa society, to work in a collaborative manner by bringing together social actors of the university and the community, and to make this experience an instance for pedagogical training. A qualitative-designed methodology was implemented, and by means of pictures, university students from undergraduate courses worked with the theoretical categories of gender violence and different types of gender violence, compromise, and femicide; they worked in conjunction with high school students. The objective of this work was to carry out an experience that would integrate the university functions of teaching, research and extension on the basis of a so sensitive social issue such as the femicides in Argentina.

  10. Desempenho de bovinos simulado pelo modelo Pampa Corte e obtido por experimentação Animal performance simulated by Pampa Corte model with experimental records

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    Naíme de Barcellos Trevisan

    2009-02-01

    Full Text Available Este trabalho tem como objetivo verificar a confiabilidade do Modelo Pampa Corte na predição de desempenho de bovinos de corte, em sistemas de pastejo. Para tanto, foram confrontados os valores preditos pelo modelo com dados disponíveis na literatura. Foram verificados coeficientes de correlação acima de 90% entre os dados reais e os simulados em todas as alternativas testadas. O banco de dados do Modelo precisa ser ampliado em termos de alternativas de produtividade das forrageiras, em diferentes condições climáticas. Os parâmetros qualitativos degradabilidade da proteína bruta e fibra em detergente neutro da consorciação aveia preta e azevém necessitam ainda ser pesquisados, assim como o desempenho de animais em pastagens singulares de aveia ou azevém.This study had the objective to evaluate Pampa Corte Model’s reliability in predicting beef cattle performance in grazing systems. For this purpose, model’s predicted values were compared to available data base of published papers. Correlation coefficients above 90 % were obtained between simulated and real data in all tested alternatives. Model’s data base should be enlarged by forage productivity data in different climatic conditions. Mixtures of Italian ryegrass and oat need more studies to obtain qualitative parameters (crude protein degradability and neutral detergent fiber, as well, animal performance in the single pastures of oat or Italian ryegrass.

  11. Redescripción de la obrera de Myrmelachista gallicola (Hymenoptera: Formicidae y primera cita para la provincia de La Pampa (Argentina

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    Estela M. QUIRÁN

    2006-01-01

    Full Text Available Se redescribe la obrera de Myrmelachista gallicola Mayr y se cita por primera vez para la provincia de La Pampa (Argentina. El material estudiado está compuesto por obreras y fue recolectado sobre Prosopis caldenia Burkart (Fabaceae, dentro de las agallas de Tetradiplosis sp. (Diptera: Cecidomyiidae, en la periferia de la ciudad de Santa Rosa, provincia de La Pampa.

  12. De Collquiri a la Bruja o dos cuentos sobre la sexualidad en Pampas - La Florida

    Directory of Open Access Journals (Sweden)

    1983-01-01

    Full Text Available Les grandes transformations du monde andin ont pénétré sa tradition orale et les communautés, comme celle de Pampas-La Florida, ont depuis longtemps cessé d'être des univers à part, refermés sur eux-mêmes, devenant selon José Maria Caballero (IEP, 1981, 387 'les fours où s'est fondue la nouvelle culture andine'. Ce processus qui tente de faire la synthèse entre l'andin et l'hispanique est en même temps un processus de résistance et d'adaptation il donne lieu à une réélaboration culturelle. La tradition orale de Pampas-La Florida en est un exemple. Elle divise l'univers communal en trois mondes: celui du surnaturel, celui des animaux -qui fera l'objet d'un prochain article- et celui des humains, dans lequel les thèmes de la mort, la guerre, l'amour et enfin la sexualité, sont toujours abordés avec un fatalisme et une ironie qui les dédramatisent. C'est ainsi que la Bruja, vieille gardienne du pont de Pampas (qui n'existe pas n'est plus que l'incarnation parodique d'un être mythique. La tradición oral no es impermeable a las transformaciones que desde hace mucho tiempo experimenta el mundo andino. Las comunidades campesinas como la de Pampas-La Florida, desde largo tiempo atrás, dejaron de ser un universo aparte, cerrado sobre sí mismo, para constituirse, según las palabras de José María Caballero (IEP, 1981, 387, en 'los hornos donde se acrisoló la nueva cultura andina'. Este proceso de síntesis entre lo hispánico y lo andino ha dado lugar a un proceso de resistencia y adaptación y a una reelaboración cultural. Tal es como aparece en la tradición oral de Pampas-La Florida. Esta divide el universo comunal en tres mundos: el sobrenatural, el de los animales -del cual trataremos en otro artículo- y el de los humanos en el cual temas como los de la muerte, de la guerra, del amor y en fin de la sexualidad son siempre tratados con fatalismo e ironía, lo que les desdramatiza. Así llega a ser la Bruja, vieja guardiana

  13. Adaptation to Interannual and Interdecadal Climate Variability in Agricultural Production Systems of the Argentine Pampas

    Science.gov (United States)

    Podestá, G. P.; Bert, F.; Weber, E.; Laciana, C.; Rajagopalan, B.; Letson, D.

    2007-05-01

    Agricultural ecosystems play a central role in world food production and food security, and involve one of the most climate-sensitive sectors of society-agriculture. We focus on crop production in the Argentine Pampas, one of the world's major agricultural regions. Climate of the Pampas shows marked variability at both interannual and decadal time scales. We explored the scope for adaptive management in response to climate information on interannual scales. We show that different assumptions about what decision makers are trying to achieve (i.e., their objective functions) may change what actions are considered as "optimal" for a given climate context. Optimal actions also were used to estimate the economic value of forecasts of an ENSO phase. Decision constraints (e.g., crop rotations) have critical influence on value of the forecasting system. Gaps in knowledge or misconceptions about climate variability were identified in open-ended "mental model" interviews. Results were used to design educational interventions. A marked increase in precipitation since the 1970s, together with new production technologies, led to major changes in land use patterns in the Pampas. Continuous cropping has widely replaced agriculture-pasture rotations. Nevertheless, production systems that evolved partly in response to increased rainfall may not be viable if climate reverts to a drier epoch. We use historical data to define a range of plausible climate trajectories 20-30 years hence. Regional scenarios are downscaled using semi-parametric weather generators to produce multiple realizations of daily weather consistent with decadal scenarios. Finally, we use the synthetic climate, crop growth models, and realistic models of decision-making under risk to compute risk metrics (e.g., probability of yields or profits being below a threshold). Climatically optimal and marginal locations show differential responses: probabilities of negative economic results are much higher in currently

  14. A rapid method for assessing the environmental performance of commercial farms in the Pampas of Argentina.

    Science.gov (United States)

    Viglizzo, E F; Frank, F; Bernardos, J; Buschiazzo, D E; Cabo, S

    2006-06-01

    The generation of reliable updated information is critical to support the harmonization of socio-economic and environmental issues in a context of sustainable development. The agro-environmental assessment and management of agricultural systems often relies on indicators that are necessary to make sound decisions. This work aims to provide an approach to (a) assess the environmental performance of commercial farms in the Pampas of Argentina, and (b) propose a methodological framework to calculate environmental indicators that can rapidly be applied to practical farming. 120 commercial farms scattered across the Pampas were analyzed in this study during 2002 and 2003. Eleven basic indicators were identified and calculation methods described. Such indicators were fossil energy (FE) use, FE use efficiency, nitrogen (N) balance, phosphorus (P) balance, N contamination risk, P contamination risk, pesticide contamination risk, soil erosion risk, habitat intervention, changes in soil carbon stock, and balance of greenhouse gases. A model named Agro-Eco-Index was developed on a Microsoft-Excel support to incorporate on-farm collected data and facilitate the calculation of indicators by users. Different procedures were applied to validate the model and present the results to the users. Regression models (based on linear and non-linear models) were used to validate the comparative performance of the study farms across the Pampas. An environmental dashboard was provided to represent in a graphical way the behavior of farms. The method provides a tool to discriminate environmentally friendly farms from those that do not pay enough attention to environmental issues. Our procedure might be useful for implementing an ecological certification system to reward a good environmental behavior in society (e.g., through tax benefits) and generate a commercial advantage (e.g., through the allocation of green labels) for committed farmers.

  15. Gross Anatomy of Pampas Deer (Ozotoceros bezoarticus, Linnaeus 1758) Mouth and Pharynx.

    Science.gov (United States)

    Pérez, W; Vazquez, N; Ungerfeld, R

    2017-04-01

    The aims of this study were to describe the anatomy of the mouth and pharynx of the pampas deer, and to consider its evolutionary feeding niche according to those characteristics. Gross dissections of the mouth and pharynx were performed in 15 animals, 10 adult females and five young animals under 1 year (three males and two females), all dead by causes unrelated to this anatomical region. The upper lip entered in the constitution of a pigmented nasolabial plane. The masseter muscles weighed 43.8 ± 3.5 g and represented 0.23% of body weight, which corresponds to ruminants of feeders intermediate to grazers and browsers. Parotid glands represented 0.08% of the body weight, characteristic that also categorize the pampas deer as belonging to the intermediate feeding group. The dental formula was the same of the domestic ruminants. The upper incisors and canines were absent, and instead of them, there was a dental pad (Pulvinus dentalis). The upper canine teeth were present only in the deciduous dentition. The existence of a brachydont dentition turns Ozotoceros very vulnerable to continuous use as there is no compensatory teeth growth. The particular anatomy of the mouth and lips of this animal was adapted to a very selective feeding, taking highly nutritious sprouts beyond plant category. In conclusion and in addition to previous studies of anatomy of the digestive organs in this species, pampas deer may be categorized as belonging to the intermediate type of feeding. © 2016 Blackwell Verlag GmbH.

  16. El surgimiento de los comedores escolares en la Pampa en crisis

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    María José Billorou

    2008-01-01

    Full Text Available Este trabajo busca examinar el surgimiento de una red de instituciones, los comedores escolares en el Territorio Nacional de La Pampa en la década de 1930, cuyo accionar se basó en la protección y la defensa de la infancia más vulnerable. El análisis de este proceso, permite develar el protagonismo de los distintos agentes estatales, las relaciones suscitadas entre las diferentes jurisdicciones –nacional, provincial y municipal– así como el papel de la comunidad en la ejecu - ción concreta de políticas públicas.

  17. Human Rights in the Training of Teachers. Paradigmatic Femicides in the Province of La Pampa, Argentina

    OpenAIRE

    Silvia Siderac; Ana Claudia Páez

    2017-01-01

    Este artículo da cuenta de la experiencia llevada a cabo a partir de la muestra fotográfica: “La violencia en foco. Tres feminicidios paradigmáticos pampeanos” que fue realizada en el interior de la comunidad educativa de la Facultad de Ciencias Humanas de la Universidad Nacional de La Pampa, en forma conjunta con la organización feminista “Mujeres por la Solidaridad” en el marco de un programa cultural de la Secretaría de Cultura y Extensión de la UNLPam. Las personas integrantes de esta act...

  18. Moessbauer spectroscopy of some volcanic glasses from the Pampa Region, Cordoba, Argentina

    International Nuclear Information System (INIS)

    Saragovi-Badler, C.; Labenski, F.

    1987-01-01

    Moessbauer spectroscopy was applied to the study of volcanic glasses and closely associated clay minerals which were carefully separated from the sediments of the Pampa Region. The parameters of volcanic glass samples show the presence of a high content of Fe 2+ in octahedral coordination and some Fe 3+ in tetrahedral and octahedral coordination. No remarcable difference was found comparing with a 'pure' volcanic glass sample taken as a reference. In the clay samples the only clay mineral found was illite. (author) 7 refs

  19. Structure of Drosophilidae Assemblage (Insecta, Diptera in Pampa Biome (São Luiz Gonzaga, RS

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    Jean Lucas Poppe

    2012-01-01

    Full Text Available The Brazilian Pampa (the southernmost end of the country is currently a highly modified environment because of increasing agricultural activities. In many places, only small parts of grasslands remain inside an agricultural landscape. Drosophilidae (Diptera have been widely used as a potential bioindicators to monitor the effects of anthropogenic changes in natural environments. However, the fauna of Drosophilidae in the Pampa Biome from natural and disturbed environments, still remains largely unknown. The present study represents one of the first attempts to fill this gap, showing results from monthly collections in the municipality of São Luiz Gonzaga (28º24'28"S, 54º57'39"W, in the Brazilian Pampa. A species inventory was carried out in two contrasting environments, an urban zone and a forest remnant (rural zone. In both areas banana-baited traps were used to capture adult drosophilids. The identification was made using external morphology and male terminalia. In total, 13,379 drosophilids were analyzed (rural zone: N = 8,812 and Sobs = 25; urban zone: N = 4,567 and Sobs = 16. In the present study, 16 (60% out of 26 species were found exclusively or preferentially in the forest. The period of highest richness was between the months of June to November (roughly winter and spring, and the period of lowest richness was from December to May (roughly summer and autumn. An analysis of cluster by the Coefficient of Jaccard showed that species composition slightly changes when the period of the year with higher temperatures (from January to May is compared with the period with lower temperatures (from June to October. The species abundances were also highly affected by seasonality, as revealed by the Morisita Index, since the samples clustered into similar groups in consecutive periods and in the same season, showing the seasonal preference of some species. The time component was a determinant in the diversity of the assemblage, surpassing the

  20. EL ROSTRO OCULTO DE ESPÍRITU PAMPA, VILCABAMBA, CUSCO (Avance/Advance)

    OpenAIRE

    Javier Fonseca Santa Cruz

    2011-01-01

    Recent archaeological studies carried out in the Vilcabamba region, northwest of Cusco, resulted in the unprecedented discovery of an elite Wari burial at the site of Espíritu Pampa. This finding is unique in many respects: first, rich burials belonging to the Wari State have not been excavated scientifically; second, this is the first tangible evidence for the existence of high rank individuals within the Wari State; and third, this finding is the first of its kind coming from the tropical r...

  1. Soil-borne bacterial structure and diversity does not reflect community activity in Pampa biome.

    Science.gov (United States)

    Lupatini, Manoeli; Suleiman, Afnan Khalil Ahmad; Jacques, Rodrigo Josemar Seminoti; Antoniolli, Zaida Inês; Kuramae, Eiko Eurya; de Oliveira Camargo, Flávio Anastácio; Roesch, Luiz Fernando Würdig

    2013-01-01

    The Pampa biome is considered one of the main hotspots of the world's biodiversity and it is estimated that half of its original vegetation was removed and converted to agricultural land and tree plantations. Although an increasing amount of knowledge is being assembled regarding the response of soil bacterial communities to land use change, to the associated plant community and to soil properties, our understanding about how these interactions affect the microbial community from the Brazilian Pampa is still poor and incomplete. In this study, we hypothesized that the same soil type from the same geographic region but under distinct land use present dissimilar soil bacterial communities. To test this hypothesis, we assessed the soil bacterial communities from four land-uses within the same soil type by 454-pyrosequencing of 16S rRNA gene and by soil microbial activity analyzes. We found that the same soil type under different land uses harbor similar (but not equal) bacterial communities and the differences were controlled by many microbial taxa. No differences regarding diversity and richness between natural areas and areas under anthropogenic disturbance were detected. However, the measures of microbial activity did not converge with the 16S rRNA data supporting the idea that the coupling between functioning and composition of bacterial communities is not necessarily correlated.

  2. Seasonal patterns of horse fly richness and abundance in the Pampa biome of southern Brazil.

    Science.gov (United States)

    Krüger, Rodrigo Ferreira; Krolow, Tiago Kütter

    2015-12-01

    Fluctuations in seasonal patterns of horse fly populations were examined in rainforests of tropical South America, where the climate is seasonal. These patterns were evaluated with robust analytical models rather than identifying the main factors that influenced the fluctuations. We examined the seasonality of populations of horse flies in fields and lowland areas of the Pampa biome of southern Brazil with generalized linear models. We also investigated the diversity of these flies and the sampling effort of Malaise traps in this biome over two years. All of the 29 species had clear seasonality with regard to occurrence and abundance, but only seven species were identified as being influenced by temperature and humidity. The sampling was sufficient and the estimated diversity was 10% more than observed. Seasonal trends were synchronized across species and the populations were most abundant between September and March and nearly zero in other months. While previous studies demonstrated that seasonal patterns in population fluctuations are correlated with climatic conditions in horse fly assemblages in South America rainforests, we show a clear effect of each factor on richness and abundance and the seasonality in the prevalence of horse fly assemblages in localities of the Pampa biome. © 2015 The Society for Vector Ecology.

  3. Presence of antibodies against Leptospira serovars in Chaetophractus villosus (Mammalia, Dasypodidae), La Pampa province, Argentina.

    Science.gov (United States)

    Kin, Marta S; Brihuega, Bibiana; Fort, Marcelo; Delgado, Fernando; Bedotti, Daniel; Casanave, Emma B

    2015-01-01

    Leptospirosis is a zoonosis of worldwide distribution. The aim of this study was to examine the presence of antibodies against 21 Leptospira reactive serovars in Chaetophractus villosus in La Pampa province, Argentina, using the microscopic agglutination test (MAT). Pathologic changes compatible with leptospirosis and in situ detection of the agent by immunohistochemistry were studied in 24 and 3 individuals respectively. Only 35/150 (23.3%) serum samples had antibodies against Leptospira sp. Six percent of the samples reacted with serovar Canicola, 4.7% with serovar Castellonis, 1.3% with serovar Icterohemorrhagieae and 0.7% with serovar Hardjo. Sixteen (10.6%) serum samples agglutinated with Castellonis-Icterohemorrhagiae and Canicola-Castellonis serovars, both with 4.7%, and Canicola-Hardjo and Castellonis-Canicola-Icterohemorrhagiae both with 0.6%. Fourteen animals had variable degrees of lesions, which were more severe in animals with higher serological titers (3200), and Leptospira sp. was detected in 3 animals by immunohistochemistry. These results represent the first record of the presence of Leptospira in C. villosus in La Pampa. Copyright © 2015 Asociación Argentina de Microbiología. Publicado por Elsevier España, S.L.U. All rights reserved.

  4. Temporal profiles of vegetation indices for characterizing grazing intensity on natural grasslands in Pampa biome

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    Amanda Heemann Junges

    2016-08-01

    Full Text Available ABSTRACT The Pampa biome is an important ecosystem in Brazil that is highly relevant to livestock production. The objective of this study was to analyze the potential use of vegetation indices to discriminate grazing intensities on natural grasslands in the Pampa biome. Moderate Resolution Imaging Spectroradiometer (MODIS Normalized Difference Vegetation Index (NDVI and Enhanced Vegetation Index (EVI images from Jan to Dec, 2000 to 2013 series, were analyzed for natural grassland experimental units managed under high (forage allowance of 5 ± 2 % live weight – LW, moderate (13 ± 5 % LW and low grazing intensity (19 ± 7 % LW. Regardless of intensity, the temporal profiles showed lower NDVI and EVI during winter, increased values in spring because of summer species regrowth, slightly decreased values in summer, especially in years when there is a water deficit, and increased values in the fall associated with the beginning of winter forage development. The average temporal profiles of moderate grazing intensity exhibited greater vegetation index values compared with low and high grazing intensities. The temporal profiles of less vegetation index were associated with lower green biomass accumulation caused by the negative impact of stocking rates on the leaf area index under high grazing intensity and a floristic composition with a predominance of tussocks under low grazing intensity. Vegetation indices can be used for distinguishing moderate grazing intensity from low and high intensities. The average EVI values can discriminate moderate grazing intensity during any season, and the NDVI values can discriminate moderate grazing intensity during spring and winter.

  5. NDVI and meteorological data as indicators of the Pampa biome natural grasslands growth

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    Denise Cybis Fontana

    2018-04-01

    Full Text Available ABSTRACT The present study aimed to characterize the dynamics of NDVI and meteorological conditions, relating both to the annual dynamics of biomass accumulation in natural pastures of the Pampa biome as a way of subsidizing growth modeling. Forage accumulation rate data from a long-term experiment, NDVI data from the MODIS images, and meteorological data measured at the surface were used. We verify that the agrometeorological element associated to the accumulation of forage in the natural grasslands is different according to the season, which is typical of the subtropical climate. Winter is the critical season for livestock production due to the lower forage accumulation rate and lower values of NDVI, conditioned by the decrease of solar radiation and air temperature. In the summer, the limiting factor to forage accumulation is the hydric condition. It was also verified that the variability in the growth of grasslands can be associated with the ENSO phenomenon, being the El Niño favorable and the La Niña unfavorable, especially in the spring-summer period. Considering the verified associations, spectral indices combined with agrometeorological elements are recommended to the adjustment of models of forage accumulation in the Pampa biome natural grasslands.

  6. COMPREENSÃO DA PAISAGEM DO ALTO CAMAQUÃ: debate ambiental sobre o Bioma Pampa

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    Adriano Severo Figueiró

    2011-01-01

    Full Text Available El presente articulo trata de la confi guración del paisaje de la subcuenca del Alto Camaquã/RS, bien como la evolución de determinados elementos naturales y la historia de las culturas que tornaran esta una de las más bellas e intrigantes paisajes que componen el territorio gaucho y el denominado Bioma Pampa. Este recorte de estudio fue determinado en función de su importancia para la conservación y protección de este bioma brasilero amenazado por la introducción de formas de "desarrollo exógeno" actualmente aprobadasy que no están de acuerdo con las particularidades socioeconómicas, culturales y ambientales de la región.En este sentido, el documento analiza las particularidades existentes y condicionamiento que los elementos naturales de este paisaje representan para el proceso de propiedad y planifi cación territorial del Pampa.

  7. Morphology of the testes and epididymal ducts in the pampas cat Leopardus colocolo (Molina, 1782

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    Mahmoud Mehanna

    Full Text Available ABSTRACT: The pampas cat Leopardus colocolo (Molina, 1782 is a species of the Felidae family, widely distributed in South America, included on CITES Appendix II and classified as Near Threatened on the IUCN Red List, with population trend decreasing. Based on this information, the objective of this study is to describe morphologically the testes and epididymal ducts of pampas cat. The animal, coming from the Federal University of Mato Grosso Zoo, Brazil, had died after anesthesia procedure and the male reproductive system was dissected to collect the testicles. The samples taken were fragmented and histologically examined. From the microscopic analysis of the testes were identified: vaginal and tunica albuginea, formed by dense connective tissue modeled with large amount of collagen fibers. The tunica albuginea fibrous septa emits into the body. The seminiferous tubules are coiled and coated internally by spermatogenic epithelium consisting of Sertoli cells, surrounded by a basement membrane in the presence of myoid cells. The interstitial tissue between the seminiferous tubules, is composed of loose connective tissue, blood and lymph vessels, and Leydig cells in polyhedral shape. The epididymal ducts showed pseudostratified columnar epithelium with secretory cells of which stereocilia design, situated on a basement membrane filled by myoid cells. This epithelium has principal and basal cells, the main cell design stereocilia toward the lumen of the epididymal duct.

  8. Multiscale Trend Analysis for Pampa Grasslands Using Ground Data and Vegetation Sensor Imagery

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    Fernando C. Scottá

    2015-07-01

    Full Text Available This study aimed to evaluate changes in the aboveground net primary productivity (ANPP of grasslands in the Pampa biome by using experimental plots and changes in the spectral responses of similar vegetation communities obtained by remote sensing and to compare both datasets with meteorological variations to validate the transition scales of the datasets. Two different geographic scales were considered in this study. At the local scale, an analysis of the climate and its direct influences on grassland ANPP was performed using data from a long-term experiment. At the regional scale, the influences of climate on the grassland reflectance patterns were determined using vegetation sensor imagery data. Overall, the monthly variations of vegetation canopy growth analysed using environmental changes (air temperature, total rainfall and total evapotranspiration were similar. The results from the ANPP data and the NDVI data showed the that variations in grassland growth were similar and independent of the analysis scale, which indicated that local data and the relationships of local data with climate can be considered at the regional scale in the Pampa biome by using remote sensing.

  9. Ornamental Eudicotyledons from grasslands of Pampa biome in Rio Grande do Sul

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    Ana De Araújo Carrion

    2012-10-01

    Full Text Available The present study aims at investigating the group of Eudicotyledons native plants with ornamental potential of grasslands from the Pampa biome in the south of Brazil. The Pampa presents a high level of biodiversity; however, it requires studies related to the richness of vascular plants and its biological and ecological knowledge. The purpose of this work is to elaborate a preliminary inventory of this group of plants, analyzing the ornamental potential of each specie and indicating those that could be considered as being priorities for the purpose of sustainable use with this objective. Some grassland species were selected through the search for information in herbarium registers, national and international works about decorative plants, floristic surveys, besides the authors´ practical knowledge. Some parameters and values were associated, aiming at reducing the subjectivity of the choice. The survey resulted in a list of 177 species distributed in 36 families and 101 genera. Among these species, ten presented high ornamental potential. These data show that the richness of the grassland native ornamental flora is high, even though its use is poorly known. The use of these plants, if in a sustainable manner, can produce economic and ecological benefits.

  10. Potential biocontrol actinobacteria: Rhizospheric isolates from the Argentine Pampas lowlands legumes.

    Science.gov (United States)

    Solans, Mariana; Scervino, Jose Martin; Messuti, María Inés; Vobis, Gernot; Wall, Luis Gabriel

    2016-11-01

    Control of fungal plant diseases by using naturally occurring non-pathogenic microorganisms represents a promising approach to biocontrol agents. This study reports the isolation, characterization, and fungal antagonistic activity of actinobacteria from forage soils in the Flooding Pampa, Argentina. A total of 32 saprophytic strains of actinobacteria were obtained by different isolation methods from rhizospheric soil of Lotus tenuis growing in the Salado River Basin. Based on physiological traits, eight isolates were selected for their biocontrol-related activities such as production of lytic extracellular enzymes, siderophores, hydrogen cyanide (HCN), and antagonistic activity against Cercospora sojina, Macrophomia phaseolina, Phomopsis sp., Fusarium oxysporum, and Fusarium verticilloides. These actinobacteria strains were characterized morphologically, physiologically, and identified by using molecular techniques. The characterization of biocontrol-related activities in vitro showed positive results for exoprotease, phospholipase, fungal growth inhibition, and siderophore production. However, none of the strains was positive for the production of hydrogen cyanide (HCN). Streptomyces sp. MM140 presented the highest index for biocontrol, and appear to be promising pathogenic fungi biocontrol agents. These results show the potential capacity of actinobacteria isolated from forage soils in the Argentine Pampas lowlands as promising biocontrol agents, and their future agronomic applications. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  11. A relevância dos indicadores de margem de contribuição na gestão de produtos diferenciados em um supermercado

    OpenAIRE

    Roehrs, Leonardo dos Santos

    2014-01-01

    Esse trabalho tem como objetivo fazer uma analise dos indicadores de margem de contribuição no desempenho e rentabilidade de uma gama de produtos de uma seção denominada “Gastronomia Especial” criada a partir da dificuldade encontrada por um grupo de pessoas em encontrar produtos diferenciados para cursos de culinária e até a para gastrônoma do dia-a-dia. Com a acirrada concorrência no comércio varejista e as exigências de alguns consumidores, o aumento do mix de produtos e a c...

  12. Modeling distribution of Schinus molle L. in the Brazilian Pampa: insights on vegetation dynamics and conservation of the biome

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    R.P.M. Lemos

    2014-12-01

    Full Text Available Natural establishment of forests in the Brazilian Pampa biome should occur due to soil, hydrology and climate conditions, although no significant forest expansion over grassland has been noticed, precluded mainly by human interference and lack of environmental management. In this study, we used niche-modeling distribution of the tree species Schinus molle L. based on climatic variables to access the vegetation dynamics of the Brazilian Pampa and to develop strategies that assure the conservation of this biome, concerning both grassland and forest formations. Here we show that a large area of the Brazilian Pampa is suitable for expansion of S. molle populations, supporting the forest expansion over grassland as a natural process in this biome. We propose that the current absence of tree species expansion over the grassland in these areas is a result of the resilience of the grassland and of human interferences through expansion of agriculture, ranching and forestry with exotic species. Therefore, conservationist actions should focus on establishing preservation unities that include forest populations and grassland, while environmental management should be applied just in farming areas with historical human interference. Such actions will respect the ecological dynamics of the Pampa and value the forest formations in this grassland-dominated environment.

  13. Molecular detection and identification of hemoparasites in pampas deer (Ozotoceros bezoarticus Linnaeus, 1758) from the Pantanal Brazil.

    Science.gov (United States)

    Silveira, Júlia A G; Rabelo, Elida M L; Lacerda, Ana C R; Borges, Paulo A L; Tomás, Walfrido M; Pellegrin, Aiesca O; Tomich, Renata G P; Ribeiro, Múcio F B

    2013-06-01

    Hemoparasites were surveyed in 60 free-living pampas deer Ozotoceros bezoarticus from the central area of the Pantanal, known as Nhecolândia, State of Mato Grosso do Sul, Brazil, through the analysis of nested PCR assays and nucleotide sequencing. Blood samples were tested for Babesia/Theileria, Anaplasma spp., and Trypanosoma spp. using nPCR assays and sequencing of the 18S rRNA, msp4, ITS, and cathepsin L genes. The identity of each sequence was confirmed by comparison with sequences from GenBank using BLAST software. Forty-six (77%) pampas deer were positive for at least one hemoparasite, according to PCR assays. Co-infection occurred in 13 (22%) animals. Based on the sequencing results, 29 (48%) tested positive for A. marginale. Babesia/Theileria were detected in 23 (38%) samples, and according to the sequencing results 52% (12/23) of the samples were similar to T. cervi, 13% (3/23) were similar to Babesia bovis, and 9% (2/23) were similar to B. bigemina. No samples were amplified with the primers for T. vivax, while 11 (18%) were amplified with the ITS primers for T. evansi. The results showed pampas deer to be co-infected with several hemoparasites, including species that may cause serious disease in cattle. Pampas deer is an endangered species in Brazil, and the consequences of these infections to their health are poorly understood. Copyright © 2013 Elsevier GmbH. All rights reserved.

  14. Close relationship of Plasmodium sequences detected from South American pampas deer (Ozotoceros bezoarticus to Plasmodium spp. in North American white-tailed deer

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    Masahito Asada

    2018-04-01

    Full Text Available We report, for the first time, the presence of ungulate malaria parasites in South America. We conducted PCR-based surveys of blood samples of multiple deer species and water buffalo from Brazil and detected Plasmodium sequences from pampas deer (Ozotoceros bezoarticus samples. Phylogenic analysis revealed that the obtained sequences are closely related to the Plasmodium odocoilei clade 2 sequence from North American white-tailed deer (Odocoileus virginianus. Nucleotide differences suggest that malaria parasites in South American pampas deer and North American P. odocoilei clade 2 branched more recently than the Great American Interchange. Keywords: Malaria, Pampas deer, South America, Plasmodium odocoilei, Brazil

  15. Prevalencia de teniosis y seroprevalencia de cisticercosis humana en Pampa Cangallo, Ayacucho, Perú 2008 Taeniosis prevalence and human cysticercosis seroprevalence in Pampa Cangallo, Ayacucho, Peru 2008

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    Avelino Cordero

    2010-12-01

    Full Text Available Para estimar la prevalencia de teniosis y la seroprevalencia de cisticercosis humana en la población del distrito de Pampa Cangallo, en la sierra central de Perú (Ayacucho; se realizó un estudio transversal en el año 2008, con 368 personas de 5 a 70 años de edad. El diagnóstico de teniosis se efectuó mediante la prueba coproparasitológica (sedimentación rápida mientras que para el diagnóstico de cisticercosis se realizó un tamizaje con la prueba de ELISA, y los casos positivos fueron confirmados por inmunoblot. Se encontró cinco casos positivos a huevos de Taenia sp, lo que representa una prevalencia de teniosis de 1,4% (IC95%: 0,2 - 2,5%, siendo los individuos entre los 20 a 49 años los que presentan la mayor proporción. Se encontró una seroprevalencia de cisticercosis de 3,3% (IC95%: 1,4 - 5,1% por 12 casos positivos, siendo más frecuente en mujeres. No se encontró asociación con ninguno de los factores estudiados. Si bien la prevalencia es baja, se confirma la existencia de la teniosis y cisticercosis en esta población, por lo que se sugiere el establecimiento de estrategias de prevención y control, con énfasis en la educación comunitaria.To estimate the taeniosis prevalence and human cysticercosis seroprevalence in a rural town from the Peruvian central Andes (Pampa Cangallo, Ayacucho, we performed a cross sectional study in 2008, included 368 people between 5 and 70 years. Fast sedimentation technique and direct examination of stool samples were used to taeniosis diagnosis, and ELISA are used as screening test to cysticercosis, positives cases were confirmed with immunoblot. We found five positives cases to Taenia sp. eggs, which represents a 1.4% (95%CI: 0.2 - 2.5% of a taeniosis prevalence, being individuals between the 20 to 49 years those which presented high proportion. We found 3.3% (95%CI: 1.5 - 5.1% of cysticercosis prevalence for 12 positives cases, being most frequent in women. No association with evaluated

  16. Land use change and ecosystem service provision in Pampas and Campos grasslands of southern South America

    Science.gov (United States)

    Modernel, P.; Rossing, W. A. H.; Corbeels, M.; Dogliotti, S.; Picasso, V.; Tittonell, P.

    2016-11-01

    New livestock production models need to simultaneously meet the increasing global demand for meat and preserve biodiversity and ecosystem services. Since the 16th century beef cattle has been produced on the Pampas and Campos native grasslands in southern South America, with only small amounts of external inputs. We synthesised 242 references from peer-reviewed and grey literature published between 1945 and mid-2015 and analysed secondary data to examine the evidence on the ecosystem services provided by this grassland biodiversity hotspot and the way they are affected by land use changes and their drivers. The analysis followed the requirements of systematic review from the PRISMA statement (Moher et al 2009 Acad. Clin. Ann. Intern. Med. 151 264-9). The Pampas and Campos provide feed for 43 million heads of cattle and 14 million sheep. The biome is habitat of 4000 native plant species, 300 species of birds, 29 species of mammals, 49 species of reptiles and 35 species of amphibians. The soils of the region stock 5% of the soil organic carbon of Latin America on 3% of its area. Driven by high prices of soybean, the soybean area increased by 210% between 2000 and 2010, at the expense of 2 million ha (5%) of native grassland, mostly in the Pampas. Intensification of livestock production was apparent in two spatially distinct forms. In subregions where cropping increased, intensification of livestock production was reflected in an increased use of grains for feed as part of feedlots. In subregions dominated by native grasslands, stocking rates increased. The review showed that land use change and grazing regimes with low forage allowances were predominantly associated with negative effects on ecosystem service provision by reducing soil organic carbon stocks and the diversity of plants, birds and mammals, and by increasing soil erosion. We found little quantitative information on changes in the ecosystem services water provision, nutrient cycling and erosion control

  17. Large-Scale Agricultural Management and Soil Meso- and Macrofauna Conservation in the Argentine Pampas

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    José Camilo Bedano

    2016-07-01

    Full Text Available Soil is the most basic resource for sustainable agricultural production; it promotes water quality, is a key component of the biogeochemical cycles and hosts a huge diversity of organisms. However, we are not paying enough attention to soil degradation produced by land use. Modern agriculture has been successful in increasing yields but has also caused extensive environmental damage, particularly soil degradation. In the Argentine Pampas, agriculturization reached a peak with the generalized use of the no-till technological package: genetically modified soybeans tolerant to glyphosate, no-till, glyphosate, and inorganic fertilizers. This phenomenon has been widely spread in the country; the no-till package has been applied in large areas and has been used by tenants in a 60%–70% of cultivated lands. Thus, those who were involved in developing management practices may not be the same as those who will face degradation issues related to those practices. Indeed, most evidence reviewed in this paper suggests that the most widely distributed practices in the Pampas region are actually producing severe soil degradation. Biological degradation is particularly important because soil biota is involved in numerous soil processes on which soil functioning relies, affecting soil fertility and productivity. For example, soil meso- and macrofauna are especially important in nutrient cycling and in soil structure formation and maintenance, and they are key components of the network that links microbial process to the scale of fields and landscapes where ecosystem services are produced. However, the knowledge of the impact of different agricultural managements on soil meso- and macrofauna in Pampas agroecosystems is far from conclusive at this stage. The reason for this lack of definite conclusions is that this area has been given less attention than in other parts of the world; the response of soil fauna to agricultural practices is complex and taxa

  18. History of a modern place: Clorindo Testa and the Santa Rosa Civic Center, La Pampa

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    Cláudia Costa Cabral

    2013-12-01

    Full Text Available Santa Rosa, capital of the young province of La Pampa, was founded in 1892 at the end of the military campaigns that annihilated the indigenous people and ensured republican control over the Patagonia region. In 1955, the city held a design competition for the construction of its Civic Center. This was not a current infill operation intended to renew the core of the city, since it was not just a matter of raising a new facade along one of the four sides of the main square. The task implied designing, almost from scratch, a new part of city. Competitors were supposed to organize new buildings and public spaces within an area of nine hectares standing between the existing city and the surrounding pampas. Clorindo Testa won the competition by proposing that it be built as a piece of a modern city. Situated in the middle of Argentinean pampas, the Santa Rosa Civic Center has been less extensively discussed than other of Testa’s great contemporary works, such as the London Bank (1959 and the National Library (1962, both in Buenos Aires, even in the South American context. The Government Building, the Bus Station and the covered central space were built before 1963. Testa finished the Legislature Building in 1976, and even though in 2006 he was able to conclude the little Legislature Library, half of the Civic Center area still remains as open space. Nevertheless, as a living piece of the never-completed modern project installed in the far south, La Pampa’s case seems to pose relevant urban questions. This paper explores the case from two complementary perspectives. One focuses on the results of the first competition, recognizing an original contribution to the relationship between modernity, monument, and place. The second discusses the unfinished condition of the Civic Center as constitutive to modern tradition in the very modern sense of the city as a never-completed work.

  19. MASCULINIDADE, MEMÓRIA E TRABALHO: UM ESTUDO ETNOGRÁFICO COM HOMENS CAMPEIROS DO PAMPA SUL-RIO-GRANDENSE EM PROCESSOS DE MOBILIDADE

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    Liza Bilhalva Martins da Silva

    2013-12-01

    Full Text Available Since the establishment of the first signs of livestock in southern south region of the Pampa of the Rio Grande do Sul transformations were present. Landscapes, men, animals, and objects are constantly involved in the process that articulates convention and invention in the pace of everyday life. This article aims to present, from the migration of male workers in the countryside to the cities of the Pampas, strategies for construction of masculinity and restoring social dynamics.

  20. Evaluation of the Membrane Permeability (PAMPA and Skin) of Benzimidazoles with Potential Cannabinoid Activity and their Relation with the Biopharmaceutics Classification System (BCS)

    OpenAIRE

    Alvarez-Figueroa, M. Javiera; Pessoa-Mahana, C. David; Palavecino-González, M. Elisa; Mella-Raipán, Jaime; Espinosa-Bustos, Cristián; Lagos-Muñoz, Manuel E.

    2011-01-01

    The permeability of five benzimidazole derivates with potential cannabinoid activity was determined in two models of membranes, parallel artificial membrane permeability assay (PAMPA) and skin, in order to study the relationship of the physicochemical properties of the molecules and characteristics of the membranes with the permeability defined by the Biopharmaceutics Classification System. It was established that the PAMPA intestinal absorption method is a good predictor for classifying thes...

  1. Environmental assessment of agriculture at a regional scale in the Pampas of Argentina.

    Science.gov (United States)

    Viglizzo, E F; Pordomingo, A J; Castro, M G; Lertora, F A

    2003-09-01

    Governments need good information to design policies. However, in the Argentine Pampas there are neither sufficient knowledge on environmental issues, nor clear perception of environmental alterations across space and time. The general objective of this work was to provide decision makers with a scientifically sound set of indicators aiming at the assessment of current status and future trends in the rural environment of this sensitive region. As driving criteria to select indicators, we assumed that they had to be sound, simple to calculate, easy to understand, and easily applicable by decision makers. They are related closely to significant ecological structures and functions. Twelve basic indicators were identified: (1) land use, (2) fossil energy use, (3) fossil energy use efficiency, (4) nitrogen (N) balance, (5) phosphorus (P) balance, (6) nitrogen contamination risk, (7) phosphorus contamination risk, (8) pesticide contamination, (9) soil erosion risk, (10) habitat intervention, (11) changes in soil carbon stock, and (12) balance of greenhouse gases. Indicators were geographically referenced using a geographic information system (GIS). The strength of this study is not in the absolute value of environmental indicators, but rather in the conceptualization of indicator and the identification of changing patterns, gradients and trends in space and time. According to our results, we can not definitely say that agriculture in the Pampas, as a whole, tends to be sustainable or not. While some indicators tend to improve, others keep stable, and the rest worsen. The relative importance among indicators must also be considered. The indicators that showed a negative net change are key to the identification of critical problems that will require special attention in the close future.

  2. Prevalencia de disfonía en profesores del distrito de Pampas - Tayacaja- Huancavelica

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    Willy Alfredo Salas Sanchez

    2004-07-01

    Full Text Available Objetivo: Determinar la prevalencia de disfonía en la población de profesores de educación primaria y secundaria en el distrito de Pampas-Tayacaja-Huancavelica. Materiales y métodos: Se realizó un estudio prospectivo descriptivo de corte transversal en los profesores del distrito de Pampas; utilizando como instrumento de estudio una entrevista tipo cuestionario dirigida por los investigadores durante los meses de junio, julio y agosto del 2003. Resultados: Se entrevistó a 75 profesores. La edad promedio fue: 36.8 años. Treintados (42.5% fueron mujeres y 43 (57.5% hombres. La prevalencia de disfonía acumulada durante el tiempo que vienen trabajando como docente fue: 44%. El 68% de los entrevistados indicaron no haber recibido capacitación para el adecuado uso de su voz. El 74.7% dicta clases por más de 15 horas por semana. 53.3% indicó estar expuesto al polvo proveniente de la tiza. 37.3% mencionó que el ruido ambiental dificulta la comunicación durante el dictado de clases. Conclusión: La prevalencia de disfonía en la población de profesores es alta al compararlo con otros estudios. Asimismo es alta la frecuencia de factores de riesgo para el desarrollo de disfonía en la población estudiada. (Rev Med Hered 2004;15:125-130.

  3. [Diversity and distribution of grasshoppers (Orthoptera: Acridoidea) in grasslands of the Southern Pampas region, Argentina].

    Science.gov (United States)

    Mariottini, Yanina; De Wysiecki, María Laura; Lange, Carlos Ernesto

    2013-03-01

    In Argentina, the grasslands of Pampas region comprise approximately 15% of the country. As in other grasslands of the world, grasshoppers are among the most important native herbivores. Their economic importance has been recognized in Argentina since the mid to late nineteenth century, since outbreaks of different species have become recurrent phenomena. Therefore, the main objective of this work was to study their diversity and distribution in grasslands of the Southern Pampas region (Laprida county, Buenos Aires province), as one of the most affected areas. The study was conducted during five seasons (2005-10). Sampling sites were represented by the most common plant communities in this area, classified in four categories: native grasslands, disturbed grasslands, implanted pastures and halophilous grasslands. The samplings were conducted from mid-spring to early autumn, with five or six samples per season. We estimated the following population descriptors: species richness (S), eveness (E), dominance (J), and diversity index (H'). In order to evaluate the similitude of the grasshopper communities present in the different plant communities, we used qualitative and quantitative coefficients of similitude. A total of 22 species of grasshoppers were collected, of which 21 belong to the family Acrididae. The subfamily Melanoplinae was the most diverse with eight species. The largest species richness was recorded in native grasslands (18). The different communities of grasshoppers had similar indices of evenness and dominance (p>0.05). Considering all plant communities, the average value of Shannon-Wiener index was 1.58+/-0.075. There was a positive correlation between evenness index and species richness (pgrasshoppers species richness, and diversity of grasshoppers. According to the qualitative indices applied, the similitude between different grasshopper communities was higher than 60%. In general, the species that had a higher frequency of occurrence showed greater

  4. Arsenic contamination of natural waters in San Juan and La Pampa, Argentina.

    Science.gov (United States)

    O'Reilly, J; Watts, M J; Shaw, R A; Marcilla, A L; Ward, N I

    2010-12-01

    Arsenic (As) speciation in surface and groundwater from two provinces in Argentina (San Juan and La Pampa) was investigated using solid phase extraction (SPE) cartridge methodology with comparison to total arsenic concentrations. A third province, Río Negro, was used as a control to the study. Strong cation exchange (SCX) and strong anion exchange (SAX) cartridges were utilised in series for the separation and preservation of arsenite (As(III)), arsenate (As(V)), monomethylarsonic acid (MA(V)) and dimethylarsinic acid (DMA(V)). Samples were collected from a range of water outlets (rivers/streams, wells, untreated domestic taps, well water treatment works) to assess the relationship between total arsenic and arsenic species, water type and water parameters (pH, conductivity and total dissolved solids, TDS). Analysis of the waters for arsenic (total and species) was performed by inductively coupled plasma mass spectrometry (ICP-MS) in collision cell mode. Total arsenic concentrations in the surface and groundwater from Encon and the San José de Jáchal region of San Juan (north-west Argentina within the Cuyo region) ranged from 9 to 357 μg l(-1) As. Groundwater from Eduardo Castex (EC) and Ingeniero Luiggi (LU) in La Pampa (central Argentina within the Chaco-Pampean Plain) ranged from 3 to 1326 μg l(-1) As. The pH range for the provinces of San Juan (7.2-9.7) and La Pampa (7.0-9.9) are in agreement with other published literature. The highest total arsenic concentrations were found in La Pampa well waters (both rural farms and pre-treated urban sources), particularly where there was high pH (typically > 8.2), conductivity (>2,600 μS cm(-1)) and TDS (>1,400 mg l(-1)). Reverse osmosis (RO) treatment of well waters in La Pampa for domestic drinking water in EC and LU significantly reduced total arsenic concentrations from a range of 216-224 μg l(-1) As to 0.3-0.8 μg l(-1) As. Arsenic species for both provinces were predominantly As(III) and As(V). As

  5. El impacto diferenciado de la autoconfianza, los modelos de referencia y el miedo al fracaso sobre los jóvenes emprendedores

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    Eduardo Gómez-Araujo

    2015-07-01

    Full Text Available El objetivo principal de este trabajo es determinar el efecto que la autoconfianza en las habilidades emprendedoras y algunas variables socio-culturales (los modelos de referencia y el estigma social al fracaso ejercen sobre la actividad emprendedora de los jóvenes en España. Con tal finalidad se realiza un modelo de regresión logística para eventos extraños, utilizando la base de datos GEM-España de 2009, con una muestra de 24.099 personas. Los resultados más importantes indican que los jóvenes son más emprendedores que las personas mayores. Además, los resultados muestran que la autoconfianza y el estigma social al fracaso empresarial tienen un efecto diferenciado sobre la probabilidad emprendedora de jóvenes españoles

  6. Spatial and temporal constraints on regional-scale groundwater flow in the Pampa del Tamarugal Basin, Atacama Desert, Chile

    Science.gov (United States)

    Jayne, Richard S.; Pollyea, Ryan M.; Dodd, Justin P.; Olson, Elizabeth J.; Swanson, Susan K.

    2016-12-01

    Aquifers within the Pampa del Tamarugal Basin (Atacama Desert, northern Chile) are the sole source of water for the coastal city of Iquique and the economically important mining industry. Despite this, the regional groundwater system remains poorly understood. Although it is widely accepted that aquifer recharge originates as precipitation in the Altiplano and Andean Cordillera to the east, there remains debate on whether recharge is driven primarily by near-surface groundwater flow in response to periodic flood events or by basal groundwater flux through deep-seated basin fractures. In addressing this debate, the present study quantifies spatial and temporal variability in regional-scale groundwater flow paths at 20.5°S latitude by combining a two-dimensional model of groundwater and heat flow with field observations and δ18O isotope values in surface water and groundwater. Results suggest that both previously proposed aquifer recharge mechanisms are likely influencing aquifers within the Pampa del Tamarugal Basin; however, each mechanism is operating on different spatial and temporal scales. Storm-driven flood events in the Altiplano readily transmit groundwater to the eastern Pampa del Tamarugal Basin through near-surface groundwater flow on short time scales, e.g., 100-101 years, but these effects are likely isolated to aquifers in the eastern third of the basin. In addition, this study illustrates a physical mechanism for groundwater originating in the eastern highlands to recharge aquifers and salars in the western Pampa del Tamarugal Basin over timescales of 104-105 years.

  7. Ensambles de aves en agroecosistemas de la provincia de Buenos Aires: su relación con los patrones de uso de la tierra y las características del paisaje

    OpenAIRE

    Codesido, Mariano

    2010-01-01

    Entre enero de 2006 y enero de 2008 se estudió estacionalmente la estructura de los ensambles de aves en los agroecosistemas de las diferentes unidades ecológicas de la Región Pampeana comprendidas dentro de la provincia de Buenos Aires (Pampa Ondulada, Pampa Interior Plana, Pampa Interior Arenosa, Pampa Deprimida y Pampa Austral). Los objetivos generales de la tesis son: a) describir la estructura de los ensambles de aves terrestres de los agroecosistemas de la provincia de Buenos Aires, b) ...

  8. Paleogenetical study of pre-Columbian samples from Pampa Grande (Salta, Argentina).

    Science.gov (United States)

    Carnese, Fransisco R; Mendisco, Fanny; Keyser, Christine; Dejean, Cristina B; Dugoujon, Jean-Michel; Bravi, Claudio M; Ludes, Bertrand; Crubézy, Eric

    2010-03-01

    Ancient DNA recovered from 21 individuals excavated from burial sites in the Pampa Grande (PG) region (Salta province) of North-Western Argentina (NWA) was analyzed using various genetic markers (mitochondrial DNA, autosomal STRs, and Y chromosomal STRs). The results were compared to ancient and modern DNA from various populations in the Andean and North Argentinean regions, with the aim of establishing their relationships with PG. The mitochondrial haplogroup frequencies described (11% A, 47% B, and 42% D) presented values comparable to those found for the ancient Andean populations from Peru and San Pedro de Atacama. On the other hand, mitochondrial and Y chromosomal haplotypes were specific to PG, as they did not match any other of the South American populations studied. The described genetic diversity indicates homogeneity in the genetic structure of the ancient Andean populations, which was probably facilitated by the intense exchange network in the Andean zone, in particular among Tiwanaku, San Pedro de Atacama, and NWA. The discovery of haplotypes unique to PG could be due to a loss of genetic diversity caused by recent events affecting the autochthonous populations (establishment of the Inca Empire in the region, colonization by the Europeans).

  9. Analysis and steps for the socioeconomic improvement of the producers from the west pampas

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    Pedro Cuello

    2006-01-01

    Full Text Available A rural population of 6,845 inhabitants -9 of the population of the province, and with a density of 0.2 inhabitants per square kilometer- inhabits the five central and western departments in the province of La Pampa. These take up 38 of the territory of the province and are in the area comprised between 300 mm and 500 mm isohyets belonging to the phytographic province of Monte. Their economy is based on natural fields with bovine, ovine, caprine and equine cattle. The population is scattered widely in the said territory and remains considerably isolated from more populated centers. The objective -to change the living conditions of the "breeders"- makes it necessary to follow steps which allow for the transformation of these subsistence economies into small cattle undertakings with acceptable profitability indexes, through more efficient use of the environment and its resources. This productive structure will foster a more helpful relationship among cattle breeders, greater freedom when making decisions, and greater economic independence. This project's stable consolidation and the achievement of its goals will result in better ecosystem management and a marked improvement in the quality of life of these remote rural producers.

  10. Summer periphyton community in two streams of the Pampa Plain, Argentina

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    Esquius Karina Soledad

    2011-11-01

    Full Text Available During summer 2001, periphytic algae associated to the giant bulrush Schoenoplectus californicus (Cyperaceae were studied in Los Padres and La Tapera streams (Pampa Plain, Argentina. One hundred and seven taxa were determined, being 76 of them common to both sampling sites. Diversity, total number of taxa and abundance of periphytic algae were greater in stems from the effl uent (La Tapera Stream. Diatoms were the most important group in both streams, according to their richness and abundance. Periphyton from the infl uent (Los Padres Stream was characterized by the dominance of the diatom Navicula cryptocephala and the codominance of another three algae. In contrast in La Tapera Stream, not any species could be recognized as dominant. Periphyton community architecture was more complex in the effl uent, with a high development of fi ve physiognomic groups. In conclusion, algal community attached to S. californicus differs in terms of diversity, abundance and community complexity, possibly due to the diffe rences registered in certain abiotic parameters, mainly in water transparency and velocity.

  11. Wetlands of the central region of the Pampa, Argentina: study and territorial planning

    International Nuclear Information System (INIS)

    Carballo, O.; Sbrocco, J.; Sotorres, E.; Del Ponti, O.; Marani, J.; Calmels, A.; Miglianelli, C.

    2007-01-01

    Nowadays, it's evident that wet lands favour a dynamic equilibrium keeping key ecologic processes and services, however, as part of a global tendency, and stimulated by the settlement and the expansion of economy, the pressure over the environment, and more particularly the wet lands, it's quickly increasing. This work puts forward the realization of an environmental characterization and a proposal of territorial planning of wet lands Urre Lauquen located in La Pampa province, Argentina, so as to attain a rational exploitation of the sources related to it. The used methodology was Gomez Orea (1993), which was adapted to the studied area.. This methodology consisted, on the one hand, in the realization of an area characterization in order to provide basic information about the different environmental factors like: geomorphology, lands, vegetation, climate, hydrology and socio-economic aspects, which were added physics and chemistry analysis. According to the obtained information, it was elaborated a territorial planning proposal where were determined which were the accurate activities to be implemented in the studied area. (author)

  12. Pathways towards to improve the feasibility of dairy pastoral system in La Pampa (Argentine

    Directory of Open Access Journals (Sweden)

    Elena Angón

    2015-11-01

    Full Text Available Over the last decade, pastoral systems have been intensified in response to an increasing demand for meat and milk, by generating environmental and social problems due to its high dependence on external inputs. The objective of this research was to analyze the economic feasibility of dairy pastoral system in La Pampa (Argentina. The main successful factors were identified through technical efficiency analysis, and subsequently improvement actions were suggested. The technique data envelopment analysis creates efficiency indexes by comparing the performance of each farm with the best practice, which defines the production frontier. The farms were classified attending to two criteria: first, the level of efficiency, second, the regular use of supplementation feed. The results showed that about 40% of the farms were efficient and the efficiency rate of the farms without supplementary feed was 80%. A 70% of the farms uses their own grassland resources adjusting milk yield to the capacity of the pasture. The technical efficiency for this group is 14% higher than the rest. Inefficient farms can adopt different strategies to enhance by practicing benchmarking. One of the examples studied shows two ways to do it: on the one hand the extensification by producing at a minimum cost; on the other hand, the technification, linked to the increase of stocking rate and the use of strategic supplementation. Finally, small changes in the management of the farms positively impact on performance, use of resources, and the sustainability of the system.

  13. Microbial quality of soil from the Pampa biome in response to different grazing pressures

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    Rafael S. Vargas

    2015-06-01

    Full Text Available The aim of this study was to evaluate the impact of different grazing pressures on the activity and diversity of soil bacteria. We performed a long-term experiment in Eldorado do Sul, southern Brazil, that assessed three levels of grazing pressure: high pressure (HP, with 4% herbage allowance (HA, moderate pressure (MP, with 12% HA, and low pressure (LP, with 16% HA. Two reference areas were also assessed, one of never-grazed native vegetation (NG and another of regenerated vegetation after two years of grazing (RG. Soil samples were evaluated for microbial biomass and enzymatic (β-glucosidase, arylsulfatase and urease activities. The structure of the bacterial community and the population of diazotrophic bacteria were evaluated by RFLP of the 16S rRNA and nifH genes, respectively. The diversity of diazotrophic bacteria was assessed by partial sequencing of the 16S rDNA gene. The presence of grazing animals increased soil microbial biomass in MP and HP. The structures of the bacterial community and the populations of diazotrophic bacteria were altered by the different grazing managements, with a greater diversity of diazotrophic bacteria in the LP treatment. Based on the characteristics evaluated, the MP treatment was the most appropriate for animal production and conservation of the Pampa biome.

  14. SOIL ORGANIC CARBON FRACTIONS AS INFLUENCED BY SOYBEAN CROPPING IN THE HUMID PAMPA OF ARGENTINA

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    Marta E. Conti

    2014-07-01

    Full Text Available The sustainability of continuous cropping systems depends heavily on the years of intensive agricultural production and the choice of crop sequence that alters the fractions of soil organic matter. The aim of this study was to evaluate the impact of continuous soybean cultivation on fractions of organic carbon in the vertic Argiudolls of the Argentinean Pampas. Total organic carbon (TOC, particulate organic carbon (POC , fulvic acids (FA, humic acids (HA, humin (H and carbon produced by microbial respiration (Cresp were assessed in plots with continuous production of soybean for over 15 years (SP and grassland plots that were considered the change control (GP. A significant reduction of TOC and POC variables in cultured soybean SP plots, relative to grassland GP, was observed. The POC / TOC and Cresp / TOC ratios were significantly lower in soybean plots than in grasslands used as controls. These ratios were interpreted as a preferential tendency to maintain high rates of mineralization of labile carbon forms and increased biological stability of humified forms in cultured soybean plots. The shapes of the humic fractions of less complexity, FA and HA, were significantly reduced in the latter plots compared with grasslands, while no significant changes occurred in the more stable and recalcitrant forms of carbon, such as humin, in either plot type.

  15. Phylogeographic analyses of the pampas cat (Leopardus colocola; Carnivora, Felidae) reveal a complex demographic history

    Science.gov (United States)

    da Silva Santos, Anelisie; Trigo, Tatiane Campos; de Oliveira, Tadeu Gomes; Silveira, Leandro

    2018-01-01

    Abstract The pampas cat is a small felid that occurs in open habitats throughout much of South America. Previous studies have revealed intriguing patterns of morphological differentiation and genetic structure among its populations, as well as molecular evidence for hybridization with the closely related L. tigrinus. Here we report phylogeographic analyses encompassing most of its distribution (focusing particularly on Brazilian specimens, which had been poorly sampled in previous studies), using a novel dataset comprising 2,143 bp of the mitogenome, along with previously reported mtDNA sequences. Our data revealed strong population strutucture and supported a west-to-east colonization process in this species’ history. We detected two population expansion events, one older (ca. 200 thousand years ago [kya]) in western South America and another more recent (ca. 60-50 kya) in eastern areas, coinciding with the expansion of savanna environments in Brazil. Analyses including L. tigrinus individuals bearing introgressed mtDNA from L. colocola showed a complete lack of shared haplotypes between species, indicating that their hybridization was ancient. Finally, we observed a close relationship between Brazilian/Uruguayan L. colocola haplotypes and those sampled in L. tigrinus, indicating that their hybridization was likely related to the demographic expansion of L. colocola into eastern South America. PMID:29668017

  16. Moessbauer and magnetic studies of parent material from argentine pampas soils

    International Nuclear Information System (INIS)

    Bidegain, J. C.; Bartel, A. A.; Sives, F. R.; Mercader, R. C.

    2007-01-01

    In order to establish a correlation between the different types of soils using hyperfine and magnetic parameters as climatic and environmental proxies, we have studied the differentiation of soil developed around 38.5 o south latitude, in the central Pampas of Argentina, by means of Moessbauer spectroscopy and environmental magnetism. The soils transect (climosequence) investigated stretches from the drier west (around 64 o W) to the more humid east (at around 59 o W) in the Buenos Aires Province, covering a distance of 600 km. The soils studied developed during recent Holocene geologic times in a landscape characterized by small relict plateaus, slopes and depressions, dunes and prairies. The parent material consists of eolian sandy silts overlying calcrete layers. The low mean annual precipitation in the western parts of the region gives rise to soils without B-horizons, which limits the agricultural use of land. The preliminary results show an increase of the paramagnetic Fe 3+ relative concentration from west to east in the soils investigated. Magnetite is probably mainly responsible for the observed enhancement in the susceptibility values. The magnetic response of the parent material is similar to that of the loess part of the previously investigated loess-paleosol sequences of the Argentine loess plateau.

  17. PAMPA--a drug absorption in vitro model. 5. Unstirred water layer in iso-pH mapping assays and pKa(flux)--optimized design (pOD-PAMPA).

    Science.gov (United States)

    Ruell, Jeffrey A; Tsinman, Konstantin L; Avdeef, Alex

    2003-12-01

    Iso-pH mapping unstirred parallel artificial membrane permeability assay (PAMPA) was used to measure the effective permeability, P(e), as a function of pH from 3 to 10, of five weak monoprotic acids (ibuprofen, naproxen, ketoprofen, salicylic acid, benzoic acid), an ampholyte (piroxicam), five monoprotic weak bases (imipramine, verapamil, propranolol, phenazopyridine, metoprolol), and a diprotic weak base (quinine). The intrinsic permeability, P(o), the unstirred water layer (UWL) permeability, P(u), and the apparent pK(a) (pK(a)(flux)) were determined from the pH dependence of logP(e). The underlying permeability-pH equations were derived for multiprotic weak acids, weak bases and ampholytes. The average thickness of the unstirred water layer on each side of the membrane was estimated to be nearly 2000 microm, somewhat larger than that found in Caco-2 permeability assays (unstirred). Since the UWL thickness in the human intestine is believed to be about forty times smaller, it is critical to correct the in vitro permeability data for the effect of the UWL. Without such correction, the in vitro permeability coefficient of lipophilic molecules would be indicative only of the property of water. In single-pH PAMPA (e.g. pH 7.4), the uncertainty of the UWL contribution can be minimized if a specially-selected pH (possibly different from 7.4) were used in the assay. From the analysis of the shapes of the log P(e)-pH plots, a method to improve the selection of the assay pH, called pK(a)(flux)-optimized design (pOD-PAMPA), was described and tested. From an optimally-selected assay pH, it is possible to estimate P(o), as well as the entire membrane permeability-pH profile.

  18. Abigeato, control estatal y relaciones de poder en el Territorio Nacional de La Pampa en las primeras décadas del siglo XX

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    Marisa Moroni

    2013-09-01

    Full Text Available This article examines the characteristics of cattle raiding in La Pampa during the first decades of the 20th century. The main objective of this research was to recognize the spread of social values regarding cattle theft in the fields of justice and press. We analyze the mechanisms of the state to control cattle theft and the social actors involved in stealing, commercializing, and transporting cattle, to make more complex the interpretations that only associate this crime to subordinate sectors of the society of La Pampa

  19. Population Genetic Structure of Cnesterodon decemmaculatus (Poeciliidae): A Freshwater Look at the Pampa Biome in Southern South America.

    Science.gov (United States)

    Ramos-Fregonezi, Aline M C; Malabarba, Luiz R; Fagundes, Nelson J R

    2017-01-01

    The Pampas is a Neotropical biome formed primarily by low altitude grasslands and encompasses the southernmost portion of Brazil, Uruguay, and part of Argentina. Despite the high level of endemism, and its significant environmental heterogeneity, Pampean species are underrepresented in phylogeographic studies, especially aquatic organisms. The Pampean hydrological system resulted from a long history of tectonism, climate, and sea level changes since the Neogene. In this study, we examined the population genetic structure of Cnesterodon decemmaculatus , a freshwater fish species that occurs throughout most of the Pampa biome. We characterized mitochondrial and autosomal genetic lineages in populations sampled from Southern Brazil and Uruguay to investigate (1) the correspondence between current drainage systems and evolutionary lineages, (2) the demographic history for each genetic lineage, and (3) the temporal depth of these lineages. Overall, we found that the major evolutionary lineages in this species are strongly related to the main Pampean drainage systems, even though stream capture events may have affected the distribution of genetic lineages among drainages. There was evidence for recent population growth in the lineages occupying drainages closest to the shore, which may indicate the effect of quaternary sea-level changes. In general, divergence time estimates among evolutionary lineages were shallow, ranging from 20,000 to 800,000 years before present, indicating a geologically recent history for this group, as previously reported in other Pampean species. A Bayesian phylogeographical reconstruction suggested that an ancestral lineage probably colonized the Uruguay River Basin, and then expanded throughout the Pampas. This evolutionary scenario may represent useful starting models for other freshwater species having a similar distribution.

  20. Assessment of the SWAT model to simulate a watershed with limited available data in the Pampas region, Argentina.

    Science.gov (United States)

    Romagnoli, Martín; Portapila, Margarita; Rigalli, Alfredo; Maydana, Gisela; Burgués, Martín; García, Carlos M

    2017-10-15

    Argentina has been among the world leaders in the production and export of agricultural products since the 1990s. The Carcarañá River Lower Basin (CRLB), a cropland of the Pampas region supplied by extensive rainfall, is located in an area with few streamgauging and other hydrologic/water-quality stations. Therefore, limited hydrologic data are available resulting in limited water-resources assessment. This work explores the application of Soil and Water Assessment Tool (SWAT) model to the CRLB in the Santa Fe province of the Pampas region. The analysis of field and remote-sensing data characterizing hydrology, water quality, soil types, land use/land cover, management practices, and crop yield, guarantee a comprehensive SWAT modeling approach. A combined manual and automated calibration and validation process incorporating sensitivity and uncertainty analysis is performed using information concerning interior watershed processes. Eleven N/P fertilizer rates are selected to simulate the impact of N fertilizer on crop yield, plant uptake, as well as runoff and leaching losses. Different indices (partial factor productivity, agronomic efficiency, apparent crop recovery efficiency of applied nutrient, internal utilization efficiency, and physiological efficiency) are considered to assess nitrogen-use efficiency. The overall quality of the fit is satisfactory considering the input data limitations. This work provides, for the first time in Argentina, a reliable tool to simulate yield response to soil quality and water availability capable to meet defined environmental targets to support decision making on planning public policies and private activities on the Pampas region. Copyright © 2017 Elsevier B.V. All rights reserved.

  1. Population Genetic Structure of Cnesterodon decemmaculatus (Poeciliidae: A Freshwater Look at the Pampa Biome in Southern South America

    Directory of Open Access Journals (Sweden)

    Aline M. C. Ramos-Fregonezi

    2017-12-01

    Full Text Available The Pampas is a Neotropical biome formed primarily by low altitude grasslands and encompasses the southernmost portion of Brazil, Uruguay, and part of Argentina. Despite the high level of endemism, and its significant environmental heterogeneity, Pampean species are underrepresented in phylogeographic studies, especially aquatic organisms. The Pampean hydrological system resulted from a long history of tectonism, climate, and sea level changes since the Neogene. In this study, we examined the population genetic structure of Cnesterodon decemmaculatus, a freshwater fish species that occurs throughout most of the Pampa biome. We characterized mitochondrial and autosomal genetic lineages in populations sampled from Southern Brazil and Uruguay to investigate (1 the correspondence between current drainage systems and evolutionary lineages, (2 the demographic history for each genetic lineage, and (3 the temporal depth of these lineages. Overall, we found that the major evolutionary lineages in this species are strongly related to the main Pampean drainage systems, even though stream capture events may have affected the distribution of genetic lineages among drainages. There was evidence for recent population growth in the lineages occupying drainages closest to the shore, which may indicate the effect of quaternary sea-level changes. In general, divergence time estimates among evolutionary lineages were shallow, ranging from 20,000 to 800,000 years before present, indicating a geologically recent history for this group, as previously reported in other Pampean species. A Bayesian phylogeographical reconstruction suggested that an ancestral lineage probably colonized the Uruguay River Basin, and then expanded throughout the Pampas. This evolutionary scenario may represent useful starting models for other freshwater species having a similar distribution.

  2. The belt of metagabbros of La Pampa: Lower Paleozoic back-arc magmatism in south-central Argentina

    Science.gov (United States)

    Chernicoff, Carlos J.; Zappettini, Eduardo O.; Villar, Luisa M.; Chemale, Farid, Jr.; Hernández, Laura

    2009-12-01

    Combined geological, geochronological, geochemical and geophysical studies have led to identification of a large (˜300 km long, ˜5 km wide) N-S trending belt of metagabbros in the province of La Pampa, south-central Argentina. This belt, though only poorly exposed in the localities of Valle Daza and Sierra de Lonco Vaca, stands out in the geophysical data (aeromagnetics and gravity). Modeling of the aeromagnetic data permits estimation of the geometry of the belt of metagabbros and surrounding rocks. The main rock type exposed is metagabbros with relict magmatic nucleii where layering is preserved. A counterclockwise P-T evolution affected these rocks, i.e., during the Middle Ordovician the protolith reached an initial granulite facies of metamorphism (M1), evolving to amphibolite facies (M2). During the Upper Devonian, a retrograde, greenschist facies metamorphism (M3) partially affected the metagabbros. The whole-rock Sm-Nd data suggest a juvenile source from a depleted mantle, with model ages ranging from 552 to 574 Ma, and positive Epsilon values of 6.51-6.82. A crystallization age of 480 Ma is based on geological considerations, i.e. geochronological data of the host rocks as well as comparisons with the Las Aguilas mafic-ultramafic belt of Sierra de San Luis (central Argentina). The geochemical studies indicate an enriched MORB and back-arc signature. The La Pampa metagabbros are interpreted to be originated as a result of the extension that took place in a back-arc setting coevally with the Famatinian magmatic arc (very poorly exposed in the western part of the study area). The extensional event was 'aborted' by the collision of the Cuyania terrane with Pampia-Gondwana in the Middle Ordovician, causing deformation and metamorphism throughout the arc-back-arc region. The similarities between the La Pampa metagabbros and the mafic-ultramafic Las Aguilas belt of the Sierra de San Luis are very conspicuous, for example, the age (Lower Paleozoic), geochemical

  3. Influence of weather variables and plant communities on grasshopper density in the Southern Pampas, Argentina.

    Science.gov (United States)

    de Wysiecki, María Laura; Arturi, Marcelo; Torrusio, Sandra; Cigliano, María Marta

    2011-01-01

    A study was conducted to evaluate the influence of weather (precipitation and temperature) and plant communities on grasshopper density over a 14-year period (1996-2009) in Benito Juárez County, Southern Pampas, Argentina. Total density strongly varied among plant communities. Highest values were registered in 2001 and 2003 in highly disturbed pastures and in 2002 and 2009 in halophilous grasslands. Native grasslands had the lowest density values. Seasonal precipitation and temperature had no significant effect on total grasshopper density. Dichroplus elongatus (Giglio-Tos) (Orthoptera: Acridoidea), Covasacris pallidinota (Bruner), Dichroplus pratensis Bruner, Scotussa lemniscata Stål, Borellia bruneri (Rehn) and Dichroplus maculipennis (Blanchard) comprised, on average, 64% of the grasshopper assemblages during low density years and 79% during high density years. Dichroplus elongatus, S. lemniscata and C. pallidinota were the most abundant species in 2001, 2002 and 2003, while D. elongatus, B. brunneri and C. pallidinota in 2009. Dichroplus elongatus and D. pratensis, mixed feeders species, were positively affected by summer rainfall. This suggests that the increase in summer precipitation had a positive effect on the quantity and quality forage production, affecting these grasshopper populations. Scotussa lemniscata and C. pallidinota were negatively affected by winter and fall temperature, possibly affecting the embryonic development before diapause and hatching. Dichroplus elongatus and D. pratensis were associated with highly disturbed pastures, S. lemniscata with pastures and B. bruneri and D. maculipennis with halophilous grasslands. Covasacris pallidinota was closely associated with halophilous grasslands and moderately disturbed pastures. Weather conditions changed over the years, with 2001, 2002 and 2003 having excessive rainfall while 2008 and 2009 were the driest years since the study started. We suggest that although seasonal precipitation and

  4. Agriculturization in the Argentinean Northern Humid Pampas: the Impact on Soil Structure and Runoff

    Science.gov (United States)

    Sasal, M. C.; Léonard, J.; Andriulo, A.; Wilson, M. G.

    2012-04-01

    Argentina is among the countries with the largest cropped area under no-tillage (NT). No tillage was adopted in the northern Humid Pampas to reduce the widespread soil degradation by water erosion. With the advent of genetically modified soybean varieties, NT has developed exponentially. This evolution, combined with the influence of the international market trend, has resulted in large changes in crop sequence composition toward the disappearance of pastures and the expansion of soybean monoculture. The aim of this work was to evaluate the long-term consequences of these changes on the topsoil structure and the way in which the evolution of soil structure relates to the simplification of the crop sequence and to runoff at a regional scale. We analyzed the topsoil structure of 25 sites with Argiudolls having 4 to 29 consecutive years of NT using the cultural profile approach. An intensification sequence index (ISI) was calculated as the ratio between the length of the growth period and the length of the year. Fifteen natural-rainfall runoff plots (100 m2) with 3.5% slope were used to analyze the relationship between soil structural state, crop sequence and runoff for four years. Four types of soil structures were identified and a general pattern of vertical soil structure organization was revealed. The top centimeters of 72% of the sites were dominated by a granular structure. Platy soil structure development was omnipresent: all sites exhibited a horizontal platy structure (wheat/soybean double crop (ISI=0.83) could limit soil structure degradation and reduce runoff and the associated environmental risks.

  5. [Detection of Chlamydia abortus in bovine reproductive losses in the province of La Pampa, Argentina].

    Science.gov (United States)

    Rojas, María Del C; Fort, Marcelo; Bettermann, Simone; Entrocassi, Carolina; Costamagna, Sixto R; Sachse, Konrad; Rodríguez Fermepin, Marcelo

    2018-01-16

    Reproductive losses linked to an infectious etiology in bovine cattle are a major economic concern worldwide. In Argentina, more than 50% of abortion cases have unknown causes. Species belonging to Chlamydiaceae family are frequent etiologic agents of abortion around the world; however, there is yet no information on their prevalence in Argentina. The objective of this work was to identify Chlamydia spp., and particularly C. abortus in reproductive losses from bovine cattle in La Pampa, Argentina. Real time PCR targeting Chlamydiaceae-specific DNA fragments was performed on 251 samples obtained from bovine abortions and stillborns, and ArrayTube was used for species identification on positive samples. Chlamydiaceae DNA was detected in 12 samples of aborted fetuses (4.78%), 83.33% (10/12) accounting for abortions and 16.66% (2/12) for stillborns. C. abortus was detected by ArrayTube in 5 cases (1.99% of all samples, and 41.67% of Chlamydiaceae positive samples). This study shows the first detection of Chlamydiaceae and C. abortus DNA on reproductive losses of bovine cattle in Argentina, and the described prevalence value (4.78%) should be taken as baseline value due to the type of samples analyzed. Detection of genetic material from Chlamydiaceae not matching any of the studied species could be due to intraspecies variants or local species not yet described. Further research on Chlamydia infections in bovine cattle in Argentina is imperative to describe their range, to analyze their economic and zoonotic implications and to make recommendations about prevention and control measures. Copyright © 2017 Asociación Argentina de Microbiología. Publicado por Elsevier España, S.L.U. All rights reserved.

  6. Long-lasting floods buffer the thermal regime of the Pampas

    Science.gov (United States)

    Houspanossian, Javier; Kuppel, Sylvain; Nosetto, Marcelo; Di Bella, Carlos; Oricchio, Patricio; Barrucand, Mariana; Rusticucci, Matilde; Jobbágy, Esteban

    2018-01-01

    The presence of large water masses influences the thermal regime of nearby land shaping the local climate of coastal areas by the ocean or large continental lakes. Large surface water bodies have an ephemeral nature in the vast sedimentary plains of the Pampas (Argentina) where non-flooded periods alternate with flooding cycles covering up to one third of the landscape for several months. Based on temperature records from 17 sites located 1 to 700 km away from the Atlantic coast and MODIS land surface temperature data, we explore the effects of floods on diurnal and seasonal thermal ranges as well as temperature extremes. In non-flooded periods, there is a linear increase of mean diurnal thermal range (DTR) from the coast towards the interior of the region (DTR increasing from 10 to 16 K, 0.79 K/100 km, r 2 = 0.81). This relationship weakens during flood episodes when the DTR of flood-prone inland locations shows a decline of 2 to 4 K, depending on surface water coverage in the surrounding area. DTR even approaches typical coastal values 500 km away from the ocean in the most flooded location that we studied during the three flooding cycles recorded in the study period. Frosts-free periods, a key driver of the phenology of both natural and cultivated ecosystems, are extended by up to 55 days during floods, most likely as a result of enhanced ground heat storage across the landscape ( 2.7 fold change in day-night heat transfer) combined with other effects on the surface energy balance such as greater night evaporation rates. The reduced thermal range and longer frost-free periods affect plant growth development and may offer an opportunity for longer crop growing periods, which may not only contribute to partially compensating for regional production losses caused by floods, but also open avenues for flood mitigation through higher plant evapotranspirative water losses.

  7. Land-use change and soil type are drivers of fungal and archaeal communities in the Pampa biome.

    Science.gov (United States)

    Lupatini, Manoeli; Jacques, Rodrigo Josemar Seminoti; Antoniolli, Zaida Inês; Suleiman, Afnan Khalil Ahmad; Fulthorpe, Roberta R; Roesch, Luiz Fernando Würdig

    2013-02-01

    The current study aimed to test the hypothesis that both land-use change and soil type are responsible for the major changes in the fungal and archaeal community structure and functioning of the soil microbial community in Brazilian Pampa biome. Soil samples were collected at sites with different land-uses (native grassland, native forest, Eucalyptus and Acacia plantation, soybean and watermelon field) and in a typical toposequence in Pampa biome formed by Paleudult, Albaqualf and alluvial soils. The structure of soil microbial community (archaeal and fungal) was evaluated by ribosomal intergenic spacer analysis and soil functional capabilities were measured by microbial biomass carbon and metabolic quotient. We detected different patterns in microbial community driven by land-use change and soil type, showing that both factors are significant drivers of fungal and archaeal community structure and biomass and microbial activity. Fungal community structure was more affected by land-use and archaeal community was more affected by soil type. Irrespective of the land-use or soil type, a large percentage of operational taxonomic unit were shared among the soils. We accepted the hypothesis that both land-use change and soil type are drivers of archaeal and fungal community structure and soil functional capabilities. Moreover, we also suggest the existence of a soil microbial core.

  8. VARIACIONES EN BAJA FRECUENCIA DE LA PRECIPITACIÓN ESTACIONAL EN LA REGIÓN PAMPA AMARILLA Y POSIBLES FORZANTES

    Directory of Open Access Journals (Sweden)

    Germán Russián

    2015-06-01

    Full Text Available Se estudia el ciclo anual de precipitación en la región Pampa Amarilla (RPA. La mayor parte de la RPA presenta máximo en marzo, seguido de noviembre y diciembre, y mínimo en invierno. El acumulado octubre-marzo (verano resulta significativamente distinto al acumulado abril- septiembre (invierno. Se analizan las variaciones, tendencias y cambios de las series temporales en verano e invierno. Las series más largas seleccionadas sobre el centro y norte de La Pampa, muestran cambio positivo y significativo por tendencia lineal, del orden del 44% de la media regional en verano. Tras una prolongada sequía (1930-1950 el cambio estival irrumpe en la década de los setenta (centro-norte de La Pampa, y en la década de los sesenta (centro-este de La Pampa. Este cambio brusco ha producido una larga fase húmeda extendida hasta comienzos de los dos mil. El cambio de la década del setenta puede estar asociado al cambio de las condiciones medias de la Temperatura superficial del mar (TSM del Pacífico central ecuatorial. Para el período de prolongada fase húmeda (1969-2009 en el sector centro y norte de la RPA hay un aumento (disminución de las precipitaciones de verano (invierno mientras que hacia el centro-sudoeste de la RPA, los cambios son negativos y significativos. La exploración de la circulación troposférica y la TSM revela que la variabilidad interanual de la precipitación está modulada por teleconexiones remotas trópico-extratrópico. Se descarta cualquier posible relación con el Modo Anular del Sur. En verano, el mecanismo de interacción es la modulación de la corriente en chorro subtropical en el Pacífico Sur hacia Sudamérica, generada por anomalías en la circulación de la celda de Hadley sobre el Pacifico ecuatorial central. El mecanismo podría estar asociado a la baja y la alta frecuencia del fenómeno El Niño. En invierno, la teleconexión está dada por la propagación de ondas cuasi estacionarias de Rossby desde la

  9. Eolian depositional phases during the past 50 ka and inferred climate variability for the Pampean Sand Sea, western Pampas, Argentina

    Science.gov (United States)

    Tripaldi, Alfonsina; Forman, Steven L.

    2016-05-01

    The Pampean Sand Sea, which occurs from the Argentinian Pampas to the eastern Andean piedmont, hosts presently stabilized dune fields spanning the late Quaternary. This study integrates previous results and presents new geomorphic, stratigraphic, sedimentological, and chronologic data for nineteen >2 m-thick eolian successions for the San Luis paleo-dune field, western Pampas, to better constrain the depositional history. Six eolian depositional phases are identified spanning the past 50 ka, interposed with paleosols and/or bounded by erosive surfaces. Age control was from 61 OSL ages of small aliquots of quartz grains from eolian stratigraphic units. The inferred timing of eolian phases are at ca. 70 ± 10 yr, 190 ± 20 yr, 12 to 1 ka, 22 to 17 ka, 29 to 24 ka, and 40 to 32 ka. A maximum span for periods of pedogenesis at ca. 12 to 17 ka, 22 to 24 ka, and 29 to 32 ka was provided by bounding OSL ages, which broadly overlap with high stands of pluvial lakes and glacier advances in the central Andes. We infer that the added precipitation may reflect expansion of the Southern Hemisphere monsoon, associated with Northern Hemisphere Heinrich events, leading to episodes of significantly wetter conditions (>350 mm MAP) to at least 35° S. Most of the Holocene (12 ka to 0.8 ka) was characterized by sand sheet deposit under drier than present conditions (100-450 mm MAP), associated with Monte-type vegetation (shrub steppe). The latest two eolian depositional phases, occurred at ca. 190 and 70 yr ago, during the historic period with European settlement and are related to anthropogenic landscape disturbance, though the youngest phase was concomitant with 1930s drought. Wet conditions dominated since ca. AD 1970 with new lakes and rivers forming across this eolian terrain; an incongruous environmental response in reference to drier conditions for most of the Holocene.

  10. Insights into Andean slope hydrology: reservoir characteristics of the thermal Pica spring system, Pampa del Tamarugal, northern Chile

    Science.gov (United States)

    Scheihing, Konstantin W.; Moya, Claudio E.; Tröger, Uwe

    2017-09-01

    The thermal Pica springs, at ˜1,400 m above sea level (asl) in the Pampa del Tamarugal (Chile), represent a low-saline spring system at the eastern margin of the hyper-arid Atacama Desert, where groundwater resources are scarce. This study investigates the hydrogeological and geothermal characteristics of their feed reservoir, fostered by the interpretation of a 20-km east-west-heading reflection-seismic line in the transition zone from the Andean Precordillera to the Pampa del Tamarugal. Additional hydrochemical, isotope and hydrologic time-series data support the integrated analysis. One of the main factors that enabled the development of the spring-related vertical fracture system at Pica, is a disruption zone in the Mesozoic Basement caused by intrusive formations. This destabilized the younger Oligocene units under the given tectonic stress conditions; thus, the respective groundwater reservoir is made up of fractured Oligocene units of low to moderate permeability. Groundwater recharge takes place in the Precordillera at ˜3,800 m asl. From there groundwater flow covers a height difference of ˜3,000 m with a maximum circulation depth of ˜800-950 m, where the waters obtain their geothermal imprint. The maximal expected reservoir temperature, as confirmed by geothermometers, is ˜55 °C. Corrected mean residence times of spring water and groundwater plot at 1,200-4,300 years BP and yield average interstitial velocities of 6.5-22 m/year. At the same time, the hydraulic head signal, as induced by recharge events in the Precordillera, is transmitted within 20-24 months over a distance of ˜32 km towards the Andean foothills at Pica and Puquio Nunez.

  11. Fijación de radioyodo en huesos maxilares simulando metástasis en pacientes con Carcinoma Diferenciado de Tiroides (CDT): False- Positive images in patients with Differentiated Thyroid Carcinoma. (DTC)

    OpenAIRE

    Degrossi, O. J.; Gutiérrez, S.; Fadel, A.; Degrossi, E. B.; Valdivieso, M. C.; Balbuena, R. L.; Alak, M. del C.; de Cabrejas, M.

    2008-01-01

    En estudios centellográficos con 131I (CCT) para seguimiento, postablación o tratamiento de pacientes portadores de carcinoma diferenciado de tiroides (CDT) se observan frecuentemente en tiempos precoces áreas de captación del radiotrazador en macizo facial. Estas áreas corresponden, generalmente, a glándulas salivares y extremo anterior de mucosa nasal y se mantienen durante las primeras 48 horas y no son observadas generalmente a las 72 horas. Pero con menor frecuencia se presentan otras qu...

  12. A Study on the Quality and Identity of Brazilian Pampa Biome Honey: Evidences for Its Beneficial Effects against Oxidative Stress and Hyperglycemia

    Directory of Open Access Journals (Sweden)

    L. C. Cruz

    2014-01-01

    Full Text Available We characterized, for the first time, the quality and identity of Brazilian Pampa biome honey and its antioxidant properties in vitro (FRAP, DDPH and ABTS. The potential protective effect of honey against oxidative stress induced by iron (Fe and paraquat, (PQ in a Drosophila melanogaster model (in vivo was also tested. The results indicated that all honey samples tested showed antioxidant activity in vitro. Flies treated with honey showed increased lifespan and were protected against oxidative stress induced by Fe and PQ. Despite the high concentration of sugars in honey (approximately 70–80%, our results demonstrate a hypoglycemic-like effect of honey in Drosophila. Thus, this study demonstrates the high quality of Brazilian Pampa biome honey as well as its significant antioxidant activity in vitro and in vivo, pointing to the potential use of this natural product as an alternative in the therapy of oxidative stress-associated diseases.

  13. A Study on the Quality and Identity of Brazilian Pampa Biome Honey: Evidences for Its Beneficial Effects against Oxidative Stress and Hyperglycemia.

    Science.gov (United States)

    Cruz, L C; Batista, J E S; Zemolin, A P P; Nunes, M E M; Lippert, D B; Royes, L F F; Soares, F A; Pereira, A B; Posser, T; Franco, J L

    2014-01-01

    We characterized, for the first time, the quality and identity of Brazilian Pampa biome honey and its antioxidant properties in vitro (FRAP, DDPH and ABTS). The potential protective effect of honey against oxidative stress induced by iron (Fe) and paraquat, (PQ) in a Drosophila melanogaster model (in vivo) was also tested. The results indicated that all honey samples tested showed antioxidant activity in vitro. Flies treated with honey showed increased lifespan and were protected against oxidative stress induced by Fe and PQ. Despite the high concentration of sugars in honey (approximately 70-80%), our results demonstrate a hypoglycemic-like effect of honey in Drosophila. Thus, this study demonstrates the high quality of Brazilian Pampa biome honey as well as its significant antioxidant activity in vitro and in vivo, pointing to the potential use of this natural product as an alternative in the therapy of oxidative stress-associated diseases.

  14. Evaluation of the membrane permeability (PAMPA and skin) of benzimidazoles with potential cannabinoid activity and their relation with the Biopharmaceutics Classification System (BCS).

    Science.gov (United States)

    Alvarez-Figueroa, M Javiera; Pessoa-Mahana, C David; Palavecino-González, M Elisa; Mella-Raipán, Jaime; Espinosa-Bustos, Cristián; Lagos-Muñoz, Manuel E

    2011-06-01

    The permeability of five benzimidazole derivates with potential cannabinoid activity was determined in two models of membranes, parallel artificial membrane permeability assay (PAMPA) and skin, in order to study the relationship of the physicochemical properties of the molecules and characteristics of the membranes with the permeability defined by the Biopharmaceutics Classification System. It was established that the PAMPA intestinal absorption method is a good predictor for classifying these molecules as very permeable, independent of their thermodynamic solubility, if and only if these have a Log P(oct) value permeability is conditioned on the solubility of the molecule so that it can only serve as a model for classifying the permeability of molecules that possess high solubility (class I: high solubility, high permeability; class III: high solubility, low permeability).

  15. Abigeato, control estatal y relaciones de poder en el Territorio Nacional de La Pampa en las primeras décadas del siglo XX

    OpenAIRE

    Marisa Moroni

    2013-01-01

    This article examines the characteristics of cattle raiding in La Pampa during the first decades of the 20th century. The main objective of this research was to recognize the spread of social values regarding cattle theft in the fields of justice and press. We analyze the mechanisms of the state to control cattle theft and the social actors involved in stealing, commercializing, and transporting cattle, to make more complex the interpretations that only associate this crime to subordinate sec...

  16. Medium- and large-sized mammals in a steppic savanna area of the Brazilian Pampa: survey and conservation issues of a poorly known fauna.

    Science.gov (United States)

    Espinosa, C C; Galiano, D; Kubiak, B B; Marinho, J R

    2016-02-01

    The wildlife of the Brazilian Pampa is threatened by large-scale habitat loss, due in particular to the expansion of soybean cultivation and the conversion of grasslands areas into extensive areas of silviculture. It is essential to study how the mammal fauna copes with the highly fragmented, human-influenced, non-protected landscape. Our study presents the results of a survey of the large- and medium-sized mammals of a typical human-influenced steppic savanna area of the Pampa biome. The survey was conducted exclusively with the use of camera traps over a period of 16 months. The relative frequencies of species in the area were evaluated. We recorded 18 species, some of them locally threatened (Tamandua tetradactyla, Alouatta caraya, Leopardus colocolo, Leopardus geoffroyi, Leopardus wiedii, Puma yagouaroundi, Mazama gouazoubira and Cuniculus paca). Several species were found to thrive in the area; however, many species were considered rare, and undoubtedly new species could be recorded if we continued the sampling. Our results contribute to the knowledge of faunal diversity in the Pampa biome and associated habitats, warn about threats and provide support for conservation measures.

  17. Medium- and large-sized mammals in a steppic savanna area of the Brazilian Pampa: survey and conservation issues of a poorly known fauna

    Directory of Open Access Journals (Sweden)

    C. C. Espinosa

    Full Text Available Abstract The wildlife of the Brazilian Pampa is threatened by large-scale habitat loss, due in particular to the expansion of soybean cultivation and the conversion of grasslands areas into extensive areas of silviculture. It is essential to study how the mammal fauna copes with the highly fragmented, human-influenced, non-protected landscape. Our study presents the results of a survey of the large- and medium-sized mammals of a typical human-influenced steppic savanna area of the Pampa biome. The survey was conducted exclusively with the use of camera traps over a period of 16 months. The relative frequencies of species in the area were evaluated. We recorded 18 species, some of them locally threatened (Tamandua tetradactyla, Alouatta caraya, Leopardus colocolo, Leopardus geoffroyi, Leopardus wiedii, Puma yagouaroundi, Mazama gouazoubira and Cuniculus paca. Several species were found to thrive in the area; however, many species were considered rare, and undoubtedly new species could be recorded if we continued the sampling. Our results contribute to the knowledge of faunal diversity in the Pampa biome and associated habitats, warn about threats and provide support for conservation measures.

  18. Assessment of water pollution in the Brazilian Pampa biome by means of stress biomarkers in tadpoles of the leaf frog Phyllomedusa iheringii (Anura: Hylidae

    Directory of Open Access Journals (Sweden)

    TG Santos

    2015-06-01

    Full Text Available The Brazilian Pampa biome is currently under constant threat due to increase of agriculture and improper management of urban effluents. Studies with a focus on the assessment of impacts caused by human activities in this biome are scarce. In the present study, we measured stress-related biomarkers in tadpoles of the leaf frog Phyllomedusa iheringii, an endemic species to the Pampa biome, and tested its suitability as a bioindicator for the assessment of potential aquatic contamination in selected ponds (S1 and S2 nearby agricultural areas in comparison to a reference site. A significant decrease in acetylcholinesterase activity was observed in S2 when compared to S1 and reference. The levels of total-hydroperoxides were increased in S2 site. In parallel, increased activity of the antioxidant enzymes catalase, superoxide dismutase and glutathione S-transferase were observed in S2 when compared to S1 and reference. Further studies are necessary in order to correlate the changes observed here with different chemical stressors in water, as well as to elucidate mechanisms of toxicity induced by pesticides in amphibian species endemic to the Pampa biome. Nevertheless, our study validates Phyllomedusa iheringii as a valuable bioindicator in environmental studies.

  19. Assessment of water pollution in the Brazilian Pampa biome by means of stress biomarkers in tadpoles of the leaf frog Phyllomedusa iheringii (Anura: Hylidae).

    Science.gov (United States)

    Santos, T G; Melo, R; Costa-Silva, D G; Nunes, Mem; Rodrigues, N R; Franco, J L

    2015-01-01

    The Brazilian Pampa biome is currently under constant threat due to increase of agriculture and improper management of urban effluents. Studies with a focus on the assessment of impacts caused by human activities in this biome are scarce. In the present study, we measured stress-related biomarkers in tadpoles of the leaf frog Phyllomedusa iheringii, an endemic species to the Pampa biome, and tested its suitability as a bioindicator for the assessment of potential aquatic contamination in selected ponds (S1 and S2) nearby agricultural areas in comparison to a reference site. A significant decrease in acetylcholinesterase activity was observed in S2 when compared to S1 and reference. The levels of total-hydroperoxides were increased in S2 site. In parallel, increased activity of the antioxidant enzymes catalase, superoxide dismutase and glutathione S-transferase were observed in S2 when compared to S1 and reference. Further studies are necessary in order to correlate the changes observed here with different chemical stressors in water, as well as to elucidate mechanisms of toxicity induced by pesticides in amphibian species endemic to the Pampa biome. Nevertheless, our study validates Phyllomedusa iheringii as a valuable bioindicator in environmental studies.

  20. Flora apícola primaveral en la región del Monte de la Provincia de La Pampa (Argentina Springtime beekeeping flora in the Monte region of La Pampa province (Argentine

    Directory of Open Access Journals (Sweden)

    Ofelia Naab

    Full Text Available Con el fin de evaluar la flora utilizada por Apis mellifera L. fueron analizadas muestras de miel inmadura y cargas corbiculares de dos apiarios demostradores ubicados en la Provincia Fitogeográfica del Monte, Provincia de La Pampa. Las muestras se extrajeron periódicamente durante la primavera y fueron analizadas aplicando las técnicas melisopalinológicas convencionales. La vegetación arbustiva nativa presentó la mayor abundancia y el mayor número de especies en óptima floración en noviembre. Las familias más representadas en los espectros polínicos de mieles inmaduras y de cargas corbiculares fueron: Zygophyllaceae ( Larrea divaricata Cav., Rhamnaceae ( Condalia microphylla Cav., Solanaceae ( Lycium sp., Asteraceae ( Senecio subulatus Don ex Hook. & Arn. y Verbenaceae ( Glandularia sp. - Junellia sp. - Verbena sp.. Los análisis polínicos evidenciaron que las especies nativas ofrecieron al mismo tiempo recursos nectaríferos y poliníferos sin embargo se observó una alta selección de pocos recursos florales. La oferta floral produjo mieles monoflorales de L. divaricata , C. microphylla y Lycium sp. Ambos apiarios pudieron diferenciarse teniendo en cuenta la diversidad de tipos polínicos y la presencia de ciertos taxones en las categorías de polen dominante y secundario.In order to evaluate the utilized flora by Apis mellifera L. we analized inmmature honey samples and corbicular pollen loads from two demonstrative apiaries located in the Monte Phytogeographical Province of La Pampa. The samples were periodically collected during springtime and were analyzed using the conventional melissopalynological techniques. The native flora presented the major abundance and the highest number of species at an optimum flowering level in november. The most represented families in the pollen spectrum of immature honeys and corbicular loads were: Zygophyllaceae ( Larrea divaricata Cav., Rhamnaceae ( Condalia microphylla Cav., Solanaceae

  1. ¿Existen relaciones entre los factores ambientales rurales y la salud reproductiva en la Pampa Húmeda Argentina? Is there any relationship between rural environmental factors and reproductive health in the Pampa Humeda in Argentina?

    Directory of Open Access Journals (Sweden)

    Alejandro Oliva

    2008-04-01

    Full Text Available La relación entre factores ambientales y salud es un hecho reconocido. La influencia de ambientes rurales sobre la salud reproductiva ha sido fehacientemente probada en diferentes regiones del mundo, tanto en la fauna como en humanos. En América Latina pocas investigaciones han sido realizadas en este campo. El presente proyecto se establece sobre la base de la describir las relaciones entre salud reproductiva y factores ambientales en poblaciones rurales, caracterizada por aspectos ambientales particulares. Tres variables han sido evaluadas: relación de nacimientos masculinos/femeninos; incidencia de malformaciones uro-genitales masculinas (hipospadias y criptorquidias; e incidencia de cánceres hormono-dependientes. Se seleccionaron cinco comunidades rurales de la Pampa Húmeda de Argentina, comparándose los datos obtenidos con medias nacionales. Los datos bio-médicos y las fuentes ambientales de riesgo fueron relacionados entre sí a través de un sistema de geo-referenciación. La relación de nacimientos no mostró significación. Las malformaciones presentaron una muy significativa incidencia. Los cánceres hormono-dependientes presentaron incidencia mayores a las medias nacionales, particularmente en algunas de las comunidades estudiadas. Se concluye que existe una relación entre condiciones de salud reproductiva y factores ambientales en esta región.The relationship between environmental factors and health is well known. Rural environmental influences on reproductive health have been properly proved, both in animals and humans. In Latin America, few studies have been conducted in this area. The current project is based on the description of relationships between reproductive health and environmental factors in rural populations, characterized by specific environmental characteristics. Three variables were evaluated: male-to-female birth ratio, male urogenital malformations (cryptorchidism and hypospadias, and endocrine

  2. Methodology for risk characterization in contamination site. Abra Pampa case (Jujuy-Argentina Metodología para caracterizar el riesgo en sitio contaminado. Caso Abra Pampa (Jujuy-Argentina

    Directory of Open Access Journals (Sweden)

    Margarita Ana Rojas

    2010-12-01

    Full Text Available One of the main regions of mining activity of the Argentine Northwest is the aride land of Jujuy. There it Abra Pampa grew like center of concentration of resources and people. One of its main establishments of mineral processing was the Smeltery Metal Huasi. Great amounts of dreg of the metallurgical processes were accumulated after decades of operation, which, after the dismantling of the factory, at the beginning of the ninety, stayed as environmental liabilities in the center of the city. The negative effects for the health of these residues just were related to a situation of risk in the middle of the present decade. The Group of Investigation INQA elaborated, in collaboration with other centers, an intervention strategy, that was based on a methodology of identification and evaluation of risk in contaminated sites and it began with the recognition and determination of physical samples, until the measurement of the lead levels in blood in the exhibited infantile population. Their results would be integrated in a scheme of Evaluation of the Risk. The study was complemented with clinical analyses, neuroconductuales tests in the group under study, consultations and interchange with the community, besides qualification with local educative actors. Like main result, it was confirmed to Abra Pampa like a contaminated site, with an elevated level of the infantile population affected by the exhibition and with the challenge to undertake his remediación. Still with the study in phase to complete the complete categorisation of the risk, the Province advanced in the removal and transfer of dregs, procedure whose impact will have to be put under new evaluations in terms of health of the population and the atmosphere.Una de las principales regiones de actividad minera del Noroeste Argentino es la Puna de Jujuy. Abra Pampa creció allí como centro de concentración de recursos y personas. Uno de sus principales establecimientos de procesamiento de

  3. Programa único o diferenciado: especificidad curricular de la escuela rural uruguaya - Common or differentiated school programs: uruguayan rural school curriculum specificity

    Directory of Open Access Journals (Sweden)

    Limber Elbio Santos, Uruguay

    2014-05-01

    education institutions, the community as well as the multi seried structure group.Key-words: rural school, curriculum, program, rural pedagogy. PROGRAMA ÚNICO O DIFERENCIADO: ESPECIFICIDAD CURRICULAR DE LA ESCUELA RURAL URUGUAYAResumenEl artículo refiere al fenómeno de la especificidad curricular que las escuelas rurales han tenido durante más de un siglo y al quiebre histórico registrado en 2009 cuando se comenzó a aplicar una estructura curricular común a escuelas urbanas y rurales. Se analizan las circunstancias históricas de la pedagogía rural y en particular, una de sus materialidades simbólicamente más potentes, constituida por el Programa para Escuelas Rurales de 1949. Se hace referencia asimismo, al peso que esa pedagogía continúa teniendo en la actualidad y de qué manera influye en la gestión curricular del programa único. Las especificidades social y didáctica de la escuela rural tienen evidentes efectos sobre lo curricular en sentido amplio, con alcances mucho más extensos que los relativos al currículo prescripto. Por lo tanto, el desafío en la escuela rural actual de abordar la nueva estructura curricular de carácter único no es tan diferente del que se registró históricamente: dialogar con el medio de igual a igual y aprovechar al máximo el potencial para aprender que brinda la institución educativa, la comunidad y el grupo de estructura multigrado.Palabras-clave: escuela rural, currículo, programa, pedagogía rural. PROGRAMME UNIQUE OU DIFFÉRENTIEL: SPÉCIFIQUE CURRICULAIRE DE L’ÉCOLE RURALE URUGUAYENNERésuméL'article fait référence au phénomène du programme de spécifique curriculaire que les écoles au milieu rurale ont eu depuis plus d'un siècle et la rupture historique enregistré en 2009 quand il a commencé à mettre en œuvre un programme commun aux écoles urbaines et rurales. Nous analysons les circonstances historiques de la pédagogie rural et en particulier, l'un des matérialités symboliquement plus

  4. Conservation implications of the mating system of the Pampa Hermosa landrace of peach palm analyzed with microsatellite markers.

    Science.gov (United States)

    Picanço-Rodrigues, Doriane; Astolfi-Filho, Spartaco; Lemes, Maristerra R; Gribel, Rogerio; Sebbenn, Alexandre M; Clement, Charles R

    2015-03-01

    Peach palm (Bactris gasipaes) is cultivated by many indigenous and traditional communities from Amazonia to Central America for its edible fruits, and is currently important for its heart-of-palm. The objective of this study was to investigate the mating system of peach palm, as this is important for conservation and breeding. Eight microsatellite loci were used to genotype 24 open-pollinated progenies from three populations of the Pampa Hermosa landrace maintained in a progeny trial for genetic improvement. Both the multi-locus outcrossing rates (0.95 to 0.99) and the progeny level multi-locus outcrossing rates (0.9 to 1.0) were high, indicating that peach palm is predominantly allogamous. The outcrossing rates among relatives were significantly different from zero (0.101 to 0.202), providing evidence for considerable biparental inbreeding within populations, probably due to farmers planting seeds of a small number of open-pollinated progenies in the same plot. The correlations of paternity estimates were low (0.051 to 0.112), suggesting a large number of pollen sources (9 to 20) participating in pollination of individual fruit bunches. Effective population size estimates suggest that current germplasm collections are insufficient for long-term ex situ conservation. As with most underutilized crops, on farm conservation is the most important component of an integrated conservation strategy.

  5. A GIS-based assessment of groundwater suitability for irrigation purposes in flat areas of the wet Pampa plain, Argentina.

    Science.gov (United States)

    Romanelli, Asunción; Lima, María Lourdes; Quiroz Londoño, Orlando Mauricio; Martínez, Daniel Emilio; Massone, Héctor Enrique

    2012-09-01

    The Pampa in Argentina is a large plain with a quite obvious dependence on agriculture, water availability and its quality. It is a sensitive environment due to weather changes and slope variations. Supplementary irrigation is a useful practice for compensating the production in the zone. However, potential negative impacts of this type of irrigation in salinization and sodification of soils are evident. Most conventional methodologies for assessing water irrigation quality have difficulties in their application in the region because they do not adjust to the defined assumptions for them. Consequently, a new GIS-based methodology integrating multiparametric data was proposed for evaluating and delineating groundwater suitability zones for irrigation purposes in flat areas. Hydrogeological surveys including water level measurements, groundwater samples for chemical analysis and electrical conductivity (EC) measurements were performed. The combination of EC, sodium adsorption ratio, residual sodium carbonate, slopes and hydraulic gradient parameters generated an irrigation water index (IWI). With the integration of the IWI 1 to 3 classes (categories of suitable waters for irrigation) and the aquifer thickness the restricted irrigation water index (RIWI) was obtained. The IWI's index application showed that 61.3 % of the area has "Very high" to "Moderate" potential for irrigation, while the 31.4 % of it has unsuitable waters. Approximately, 46 % of the tested area has high suitability for irrigation and moderate groundwater availability. This proposed methodology has advantages over traditional methods because it allows for better discrimination in homogeneous areas.

  6. Linking in situ bioassays and population dynamics of macroinvertebrates to assess agricultural contamination in streams of the Argentine pampa.

    Science.gov (United States)

    Jergentz, S; Pessacq, P; Mugni, H; Bonetto, C; Schulz, R

    2004-10-01

    The two local crustacean species Hyalella curvispina and Macrobrachium borelli were chosen for assessment of agricultural contamination in two streams (Horqueta and Maguire) in the Argentine pampa. In parallel with in situ bioassays of both species, the population dynamics and the organismic drift of H. curvispina were investigated throughout the main period of insecticide application, from December 2001 to March 2002. In Maguire none of the current-use insecticides (chlorpyrifos, alpha-cypermethrin, and endosulfan) in question were detected throughout the sampling period. During 1-week intervals with no contamination by insecticides the survival rate of H. curvispina varied between 77 +/- 6% (+/- SE, n = 4) and 85 +/- 3%. In Horqueta during a week with a peak insecticide contamination of 64 microg/kg chlorpyrifos in the suspended particles, a mortality of 100% was observed in the in situ bioassays for both species, H. curvispina and M. borelli. At the same time, in Maguire H. curvispina showed reduced survival rates of 23 +/- 5% and 25 +/- 18% at the two sites, while the survival rate of M. borelli was 60 +/- 11% upstream and 93 +/- 5% downstream, below a wetland. During the period with 100% mortality of H. curvispina in Horqueta, the population density of this species decreased correspondingly, from 106 +/- 26 to 0 individuals/m(2). We conclude that in situ bioassays can be successfully linked to in-stream population dynamics for the same species and that this link is very useful for interpreting causal exposure-effect relationships.

  7. Activity pattern of medium and large sized mammals and density estimates of Cuniculus paca (Rodentia: Cuniculidae in the Brazilian Pampa

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    C. Leuchtenberger

    2018-02-01

    Full Text Available Abstract Between July 2014 and April 2015, we conducted weekly inventories of the circadian activity patterns of mammals in Passo Novo locality, municipality of Alegrete, southern Brazil. The vegetation is comprised by a grassy-woody steppe (grassland. We used two camera traps alternately located on one of four 1 km transects, each separated by 1 km. We classified the activity pattern of species by the percentage of photographic records taken in each daily period. We identify Cuniculus paca individuals by differences in the patterns of flank spots. We then estimate the density 1 considering the area of riparian forest present in the sampling area, and 2 through capture/recapture analysis. Cuniculus paca, Conepatus chinga and Hydrochoerus hydrochaeris were nocturnal, Cerdocyon thous had a crepuscular/nocturnal pattern, while Mazama gouazoubira was cathemeral. The patterns of circadian activity observed for medium and large mammals in this Pampa region (southern grasslands may reflect not only evolutionary, biological and ecological affects, but also human impacts not assessed in this study. We identified ten individuals of C. paca through skin spot patterns during the study period, which were recorded in different transects and months. The minimum population density of C. paca was 3.5 individuals per km2 (resident animals only and the total density estimates varied from 7.1 to 11.8 individuals per km2, when considering all individuals recorded or the result of the capture/recapture analysis, respectively.

  8. Activity pattern of medium and large sized mammals and density estimates of Cuniculus paca (Rodentia: Cuniculidae) in the Brazilian Pampa.

    Science.gov (United States)

    Leuchtenberger, C; de Oliveira, Ê S; Cariolatto, L P; Kasper, C B

    2018-02-22

    Between July 2014 and April 2015, we conducted weekly inventories of the circadian activity patterns of mammals in Passo Novo locality, municipality of Alegrete, southern Brazil. The vegetation is comprised by a grassy-woody steppe (grassland). We used two camera traps alternately located on one of four 1 km transects, each separated by 1 km. We classified the activity pattern of species by the percentage of photographic records taken in each daily period. We identify Cuniculus paca individuals by differences in the patterns of flank spots. We then estimate the density 1) considering the area of riparian forest present in the sampling area, and 2) through capture/recapture analysis. Cuniculus paca, Conepatus chinga and Hydrochoerus hydrochaeris were nocturnal, Cerdocyon thous had a crepuscular/nocturnal pattern, while Mazama gouazoubira was cathemeral. The patterns of circadian activity observed for medium and large mammals in this Pampa region (southern grasslands) may reflect not only evolutionary, biological and ecological affects, but also human impacts not assessed in this study. We identified ten individuals of C. paca through skin spot patterns during the study period, which were recorded in different transects and months. The minimum population density of C. paca was 3.5 individuals per km2 (resident animals only) and the total density estimates varied from 7.1 to 11.8 individuals per km2, when considering all individuals recorded or the result of the capture/recapture analysis, respectively.

  9. Conservation implications of the mating system of the Pampa Hermosa landrace of peach palm analyzed with microsatellite markers

    Directory of Open Access Journals (Sweden)

    Doriane Picanço-Rodrigues

    2015-03-01

    Full Text Available Peach palm (Bactris gasipaes is cultivated by many indigenous and traditional communities from Amazonia to Central America for its edible fruits, and is currently important for its heart-of-palm. The objective of this study was to investigate the mating system of peach palm, as this is important for conservation and breeding. Eight microsatellite loci were used to genotype 24 open-pollinated progenies from three populations of the Pampa Hermosa landrace maintained in a progeny trial for genetic improvement. Both the multi-locus outcrossing rates (0.95 to 0.99 and the progeny level multi-locus outcrossing rates (0.9 to 1.0 were high, indicating that peach palm is predominantly allogamous. The outcrossing rates among relatives were significantly different from zero (0.101 to 0.202, providing evidence for considerable biparental inbreeding within populations, probably due to farmers planting seeds of a small number of open-pollinated progenies in the same plot. The correlations of paternity estimates were low (0.051 to 0.112, suggesting a large number of pollen sources (9 to 20 participating in pollination of individual fruit bunches. Effective population size estimates suggest that current germplasm collections are insufficient for long-term ex situ conservation. As with most underutilized crops, on farm conservation is the most important component of an integrated conservation strategy.

  10. Dissipation of 2,4-D in soils of the Humid Pampa region, Argentina: a microcosm study.

    Science.gov (United States)

    Merini, Luciano J; Cuadrado, Virginia; Flocco, Cecilia G; Giulietti, Ana M

    2007-06-01

    Phenoxy herbicides like 2,4-dichlorophenoxyacetic acid (2,4-D) are widely used in agricultural practices. Although its half life in soil is 7-14d, the herbicide itself and its first metabolite 2,4-dichlorophenol (2,4-DCP) could remain in the soil for longer periods, as a consequence of its intensive use. Microcosms assays were conducted to study the influence of indigenous microflora and plants (alfalfa) on the dissipation of 2,4-D from soils of the Humid Pampa region, Argentina, with previous history of phenoxy herbicides application. Results showed that 2,4-D was rapidly degraded, and the permanence of 2,4-DCP in soil depended on the presence of plants and soil microorganisms. Regarding soil microbial community, the presence of 2,4-D degrading bacteria was detected even in basal conditions in this soil, possibly due to the adaptation of the microflora to the herbicide. There was an increment of two orders of magnitude in herbicide degraders after 15d from 2,4-D addition, both in planted and unplanted microcosms. Total heterotrophic bacteria numbers were about 1x10(8) CFUg(-1) dry soil and no significant differences were found between different treatments. Overall, the information provided by this work indicates that the soil under study has an important intrinsic degradation capacity, given by a microbial community adapted to the presence of phenoxy herbicides.

  11. Groundwater contamination with arsenic and other trace elements in an area of the Pampa, province of Cordoba, Argentina

    International Nuclear Information System (INIS)

    Nicolli, H.B.; Suriano, J.M.; Gomez Peral, M.A.; Ferpozzi, L.H.; Baleani, O.A.

    1989-01-01

    A geochemical study of the groundwater of the pampa in the province of Cordoba, Argentina, is reported. Physical-chemical parameters, dissolved solids, and seven trace elements were determined in 60 selected water samples. Systematic and accurate measurements of arsenic, fluorine, and vanadium were performed for the first time. The geographic distribution of the seven trace elements was mapped and its correlation with the anion-cation composition of the water was studied. Eighty-four percent of the water analyzed showed arsenic contents over 0.05 mg/l. The maxima for arsenic, fluorine, vanadium, and uranium contents were found in the western part of the study area, in waters dominated by alkali metal cations. Maximum selenium and antimony contents were found in the eastern part of the areas, whereas molybdenum distribution showed no relationship to the other groups. The movements of the subsoil have disturbed surface and subsurface drainage, thus influencing the water salinity and trace element contents. To investigate the origin of contamination, 54 loess samples were collected at wells in depths ranging from the surface down to the water table. This loess, which has a high proportion of volcanic components, mainly rhyolitic glass, exhibits a chemical composition corresponding to that of a dacite. The loess and volcanic glass show anomalous contents of all contaminant trace elements, mainly arsenic and selenium. For this reason, loess is considered to be the most important source of contamination of this ground water area. 30 refs., 6 figs., 9 tab

  12. Dactylogyrid monogeneans parasitising Cyphocharax voga (Hensel) (Teleostei: Curimatidae) from the Pampas region, Argentina: new and previously described species.

    Science.gov (United States)

    Rossin, María Alejandra; Timi, Juan Tomás

    2016-09-01

    Most studies on dactylogyrid monogeneans in Argentina have been carried out during 1980s and 1990s. Many of these species have been later synonymised and other remain under a confusing taxonomic status, particularly those parasitising Cyphocharax voga (Hensel) (Teleostei: Curimatidae). In order to clarify the identity of dactylogyrids, new material was collected from fishes in Lake Chascomús, Buenos Aires Province, Argentina. A total of four species was found in the gills of C. voga. Two known species, Curvianchoratus singularis (Suriano, 1980) Suriano, 1986 and Palombitrema triangulum (Suriano, 1981) Suriano, 1997, are redescribed and their generic and specific status discussed, and two new species are described. Urocleidoides surianoae n. sp. can be distinguished from its congeners by having an anterior medial projection in the ventral bar and a laminar ligament connecting the base of the male copulatory organ and accessory piece. Annulotrematoides bonaerensis n. sp. differs from its congeners principally by having a ventral bar with an anterior medial projection. The diversity of dactylogyrids harboured by C. voga indicates the need of further studies in the Pampas region, which will provide interesting and valuable sources of evidence for future zoogeographical and evolutionary research on dactylogyrids in the Neotropics.

  13. Effect of Continuous Agriculture of Grassland Soils of the Argentine Rolling Pampa on Soil Organic Carbon and Nitrogen

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    Luis A. Milesi Delaye

    2013-01-01

    Full Text Available Long-term soil organic carbon (SOC and soil organic nitrogen (SON following cultivation of grassland soils (100/120-year tillage (T + 20/30-year no tillage (NT of the Rolling Pampa were studied calibrating the simple AMG model coupled with the natural 13C abundance measurements issued from long-term experiments and validating it on a data set obtained by a farmer survey and by long-term NT experiments. The multisite survey and NT trials permitted coverage of the history of the 140 years with agriculture. The decrease in SOC and SON storage that occurred during the first twenty years by a loss through biological activity was 27% for SOC and 32% for SON. The calibrated model described the SOC storage evolution very well and permitted an accurate simultaneous estimation of their three parameters. The validated model simulated well SOC and SON evolution. Overall, the results analyzed separately for the T and NT period indicated that the active pool has a rapid turnover (MRT ~9 and 13 years, resp. which represents 50% of SOC in the native prairie soil and 20% of SOC at equilibrium after NT period. NT implementation on soils with the highest soil organic matter reserves will continue to decrease (17% for three decades later under current annual addition.

  14. Areal changes of lentic water bodies within an agricultural basin of the Argentinean pampas. Disentangling land management from climatic causes.

    Science.gov (United States)

    Booman, Gisel Carolina; Calandroni, Mirta; Laterra, Pedro; Cabria, Fabián; Iribarne, Oscar; Vázquez, Pablo

    2012-12-01

    Wetland loss is a frequent concern for the environmental management of rural landscapes, but poor disentanglement between climatic and land management causes frequently constrains both proper diagnoses and planning. The aim of this study is to address areal changes induced by non-climatic factors on lentic water bodies (LWB) within an agricultural basin of the Argentinean Pampas, and the human activities that might be involved. The LWB of the Mar Chiquita basin (Buenos Aires province, Argentina) were mapped using Landsat images from 1998-2008 and then corrected for precipitation variability by considering the regional hydrological status on each date. LWB areal changes were statistically and spatially analyzed in relation to land use changes, channelization of streams, and drainage of small SWB in the catchment areas. We found that 12 % of the total LWB in the basin had changed (P climatic causes. During the evaluated decade, 30 % of the LWB that changed size had decreased while 70 % showed steady increases in area. The number of altered LWB within watersheds lineally increased or decreased according to the proportion of grasslands replaced by sown pastures, or the proportion of sown pastures replaced by crop fields, respectively. Drainage and channelization do not appear to be related to the alteration of LWB; however some of these hydrologic modifications may predate 1998, and thus earlier effects cannot be discarded. This study shows that large-scale changes in land cover (e.g., grasslands reduction) can cause a noticeable loss of hydrologic regulation at the catchment scale within a decade.

  15. Efeitos da radioiodoterapia nas gerações futuras de mulheres com carcinoma diferenciado de tireóide Radioiodine therapy effects on offspring of patients with differentiated thyroid carcinoma

    Directory of Open Access Journals (Sweden)

    Carmen Dolores Gonçalves Brandão

    2004-02-01

    Full Text Available A radioiodoterapia tem conseguido desempenhar um papel significante no tratamento do carcinoma diferenciado de tireóide. A literatura é limitada em relação a possíveis efeitos secundários do 131I, embora o interesse tenha aumentado nesse campo. A importância de se saber mais sobre os efeitos mutagênicos da radiação em filhos de mães expostas ao 131I para tratamento do carcinoma diferenciado de tireóide é devida à possibilidade de ocorrência de abortos, anormalidades genéticas e aparecimento de malignidades nas crianças. Nesta revisão da literatura vários estudos têm demonstrado a segurança desse tipo de tratamento em mulheres na idade fértil, sendo apenas aconselhadas a evitar gravidez pelo período de, pelo menos, um ano após a administração da radioiodoterapia.Radioiodine therapy has attained a significant role in the treatment of differentiated thyroid cancer. The literature addressing possible secondary effects of 131I is limited, although there has been increasingly interest in this field. A more comprehensive understanding of the mutagenic effects of radiation on the offspring of women exposed to 131I is mandatory in view of the possibility of occurrence of miscarriages, congenital abnormalities and malignancies in these children. In this review, we found that many reports on safety of this type of treatment in female patients in reproductive age recommend that pregnancy should be avoided for at least one year after therapeutic administration of radioiodine.

  16. Integral Study of Atrazine Behaviour in Field Lysimeters in Argentinean Humid Pampas Soils Estudio Integral del Comportamiento de Atrazina en Lisímetros de Campo en Suelos de la Pampa Húmeda Argentina

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    Susana Hang

    2010-03-01

    Full Text Available Atrazine behavior during crop maize (Zea mays L. production in soils of Argentine humid pampas was investigated. Lysimeters (3.3 x 3.3 x 1.4 m with a Typic Argiudoll (Pergamino and others with a Typic Hapludoll (Junín were monitored for drainage water content and atrazine concentrations in soil and water. Soil profiles were sampled in four depths in three dates, and water drainage pooled in four periods. Most of atrazine loss in drainage occurred within 30 d of atrazine application being 0.13% and 0.03% of the total atrazine applied for Pergamino and Junín, respectively. Under laboratory conditions half-life average in both profiles was 16 d. Atrazine extractable residues (AER in lysimeters showed differences in quantity and distribution between both profiles. Extractable residues were 25.7 (Pergamino and 69.4 g ha-1 (Junín. At the 30th day of application, AER represented 25% of total AER in Junín and 88% in Pergamino in the first 30 cm. Occurrence of preferential flow through the Bt horizon (Pergamino may explain differences detected. High proportion of AER in Junín profile suggests low atrazine affinity and should be followed through time in order to evaluate actual stability of these residues and if they constitute a potential risk for aquifers.Se estudió el comportamiento de atrazina durante el ciclo de un cultivo de maíz (Zea mays L. en suelos de la pampa húmeda Argentina. Se monitoreó el total de agua drenada y la concentración de atrazina en suelo y agua, mediante el uso de seis lisímetros (3.3 x 3.3 x 1.4 m tres de ellos llenados con un Argiudoll Típico (Pergamino y otros tres con un Hapludoll Típico (Junín. Se tomaron muestras de cuatro horizontes en cada perfil de suelo en tres fechas y el agua drenada se agrupó en cuatro períodos. La mayor parte de las pérdidas de atrazina en el drenaje ocurrieron dentro de los primeros 30 días desde la aplicación de atrazina. Los porcentajes recuperados respecto de la cantidad

  17. Lotus tenuis Seedling Establishment and Biomass Production in Flooding Pampa Grasslands (Buenos Aires , Argentina Establecimiento de Plántulas y Producción de Biomasa de Lotus tenuis en Pastizales de la Pampa Deprimida (Buenos Aires, Argentina

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    Osvaldo R Vignolio

    2011-03-01

    Full Text Available Biomass and plant density of Lotus tenuis Waldst. & Kit. ex Willd. have been reported in decreasing in grasslands and pastures. Our objective was to determine if L. tenuis biomass and plant density can be increased in grassland through seed addition. Two separated experiments under cattle grazing exclusion were conducted in three paddocks of a Flooding Pampa grassland. The first experiment was from autumn 2004 to autumn 2006 and the second from autumn 2005 to autumn 2007. Different L. tenuis seed additions (0, 57, 229, 917 and 1833 seeds m-² were broadcast into experimental plots. In the second experiment, besides seed additions there was a reseeding of approximately 900 seed m-² from seed rain produced by plants of grassland. Seed density explained the 81% and 19% of the variation in seedling density and L. tenuis biomass, respectively. Seedling emergence occurred mainly between autumn and early spring, while seedling mortality was mainly between late spring and early summer. Lotus tenuis adult plant density and biomass production increased with seed additions. Total biomass production in the plant community varied between 589.94 ± 26.89 and 1042.44 ± 54.39 g m-² yr-1 and the differences were principally attributed to precipitations. Lotus tenuis biomass contribution was of approximately 10%. The results suggest that L. tenuis seedling and plant establishment and biomass production can be increased through seed addition and/or seed rain through grazing exclusion during reproductive period.En pastizales y pasturas ha sido documentada la reducción de la densidad de plantas y de la biomasa de Lotus tenuis Waldst. & Kit. ex Willd. Nuestro objetivo fue determinar si su densidad de plantas y su producción de biomasa pueden ser incrementadas en un pastizal mediante la adición de semillas. Dos experimentos sin pastoreo fueron realizados en tres potreros de un pastizal de la Pampa Deprimida. El primer experimento fue realizado entre otoño 2004

  18. Uso e Conservação de florestas de galeria do bioma Pampa Brasileiro Anthropogenic use of gallery forests in the Brazilian Pampa - doi: 10.4025/actascibiolsci.v35i2.13458

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    Valdir Marcos Stefenon

    2013-05-01

    Full Text Available Como efeito do crescimentop demográfico, muitas cidades no Sul do Brasil experimentaram, na última década, um processo de degradação de áreas de preservação ambiental. O planejamento de programas de recuperação de florestas depende de conhecimento estruturado sobre a utilização de espécies vegetais pelas comunidades locais. Entrevistas semi-estruturadas e inventários fitossociológicos foram empregados para acessar o efeito do uso antropogênico de espécies arbóreas de matas de galeria em áreas do Pampa brasileiro. Oitenta e quatro informantes foram entrevistados e listaram um total de 43 espécies, pertencentes a 23 famílias botânicas. Quatro categorias de uso foram identificadas para as espécies citadas: lenha, medicamento, alimento e madeira. As três espécies mais importantes foram Blepharocalyx salicifolius, Eugenia uniflora e Salix babilonica. O inventário fitossociológico sugere que a exploração antropogênica da mata de galeria está levando algumas espécies a extinção e/ou ameaça local. Com o objetivo de preservar as matas de galeria, sugere-se a re-avaliação das atitudes das comunidades locais, visando um uso sustentável das matas e o reflorestamento das margens de rios com espécies nativas produtoras de frutos comestíveis, possibilitando a exploração de produtos não-madeireiros, assim como o estabelecimento de animais nestes ambientes.As effect of demographic growth in the last decades, many cities in Southern Brazil experienced a degradation process of conservation areas. In this study, semi-structured interviews and a phytosociological inventory were employed to assess the effect of anthropogenic use of tree species of the gallery forest in the Brazilian Pampa. Eighty-four informants were interviewed and listed a total of 43 tree species, belonging to 23 botanical families. Four categories of use were identified for the referenced species: firewood, medicinal, food and timber. The three most

  19. Ordenamento Territorial Ambiental Sustentável no Bioma Pampa: Estudo de Caso, São Francisco de Assis – RS, Brasil.

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    Mg. Arq. Amélia Simões Schwertner

    2013-04-01

    Full Text Available O Bioma Pampa, tombado pela UNESCO (2008 se estende desde o Sul do Brasil aos países vizinhos Uruguai e Argentina. São Francisco de Assis, município da Metade Sul do Rio Grande do Sul, possui em seu território uma área de importante fragilidade ambiental: a zona de amortecimento entre a Mata Atlântica e o Bioma Pampa. Na sede urbana de São Francisco de Assis aconteceu um caso inusitado: um bando de bugios fez da sua praça central seu habitat. Adotados, a população urbana tomou para si a identidade «Querência do Bugio». Este fato levou os Planejadores Urbanos a questionar-se do por que estes animais não permaneciam nas matas, seu local de origem -o desmatamento a degradação ambiental. Ao redor do sítio urbano, ao longo de três mananciais hídricos foi criado o Parque Municipal do Bugio e por prolongamentos destes mananciais aos bosques mais distantes na zona rural, corredores ecológicos. Propostas de ordenamento territorial determinaram diretrizes para reposição florestal, recuperação das matas ciliares e de inúmeras voçorocas que provocavam degradação do solo e um crescente processo de arenização. A presença de bugios na praça desencadeou um processo de recuperação e consciência ambiental na preservação do Bioma Pampa e identidade local

  20. Evaluación Rápida del Ecosistema Marino Desarrollado en la Zona de Carga de la Planta Pampa Melchorita de Perú LNG.

    OpenAIRE

    Chamorro, Alan; Contreras, Christian; Raschio, Giancarlo

    2014-01-01

    La Planta Pampa Melchorita de Perú LNG se establece sobre un ecosistema costero árido el cual limita por el oeste con un acantilado rocoso y cuyas condiciones ambientales corresponden a un ecosistema marino con playas, un litoral rocoso y una zona pelágica; las tres sub-unidades han sufrido modificaciones físicas, donde estas modificaciones podrían haber generado variaciones en la biodiversidad local. El principal objetivo del presente estudio es describir las principales características b...

  1. Variación de la recarga entre La Plata y Santa Isabel (provincias de Buenos Aires y La Pampa - Argentina) : Propuesta metodológica

    OpenAIRE

    Hernández, Mario Alberto; Giai, Santiago B.

    1996-01-01

    Se analiza la recarga potencial de aguas subterráneas sobre un perfil entre La Plata y Santa Isabel (Buenos Aires y La Pampa). El mismo tiene la particularidad de ser perpendicular a las isohietas, extendiéndose desde una zona húmeda lindante con el río de la Plata, hasta otra de fuerte aridez y continentalidad, unos 900 km al Oeste. Algunos de los factores influyentes en el monto de la recarga tienen el mismo valor en todo el perfil, alcanzando su intervención igual peso en todas las local...

  2. Comparación de métodos para estimar el tamaño poblacional del venado de las pampas (Ozotoceros bezoarticus)

    OpenAIRE

    Antúnez Gómez, Berta

    2017-01-01

    Evalua diferentes métodos para estimar la abundancia poblacional del venado de las pampas (Ozotoceros bezoarticus) reintroducido en la Reserva Natural Iberá, provincia de Corrientes, Argentina, evaluando la precisiòn y los errores asociados a cada uno de ellos. Los métodos considerados fueron: 1. transectos lineales de ancho variable basado en distancias (método de distancias) 2. marca-reavistamiento 3. conteo completo en mosaicos obtenidos con un vehículo aéreo no tripulado (dron) 4. conteo ...

  3. For an ecology of scientific work: science, politics and the case of streams Pampa and Luiz Rau in Novo Hamburgo, Brazil

    Directory of Open Access Journals (Sweden)

    M. Meirelles

    Full Text Available If, like Weber writes, every knowledge is objective in terms of evolving the interests of researchers and the agencies, in this article, we investigate that, which has been researched about two streams: Pampa and Luiz Rau. In doing so, in addition to highlighting what has caught the researchers' attention, this paper manages to point out a few gaps and fruitful fields of study which extend beyond the hard sciences. This study is, therefore, characterized as an essay review paper that sets out to use anthropology of science to think about the limitations and advances the studies about the two streams have achieved, as well as their social impact.

  4. For an ecology of scientific work: science, politics and the case of streams Pampa and Luiz Rau in Novo Hamburgo, Brazil.

    Science.gov (United States)

    Meirelles, M; Pedde, V; Figueiredo, J A S

    2015-12-01

    If, like Weber writes, every knowledge is objective in terms of evolving the interests of researchers and the agencies, in this article, we investigate that, which has been researched about two streams: Pampa and Luiz Rau. In doing so, in addition to highlighting what has caught the researchers' attention, this paper manages to point out a few gaps and fruitful fields of study which extend beyond the hard sciences. This study is, therefore, characterized as an essay review paper that sets out to use anthropology of science to think about the limitations and advances the studies about the two streams have achieved, as well as their social impact.

  5. Interactive effects of large- and small-scale sources of feral honey-bees for sunflower in the Argentine Pampas.

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    Agustín Sáez

    Full Text Available Pollinators for animal pollinated crops can be provided by natural and semi-natural habitats, ranging from large vegetation remnants to small areas of non-crop land in an otherwise highly modified landscape. It is unknown, however, how different small- and large-scale habitat patches interact as pollinator sources. In the intensively managed Argentine Pampas, we studied the additive and interactive effects of large expanses (up to 2200 ha of natural habitat, represented by untilled isolated "sierras", and narrow (3-7 m wide strips of semi-natural habitat, represented by field margins, as pollinator sources for sunflower (Helianthus annus. We estimated visitation rates by feral honey-bees, Apis mellifera, and native flower visitors (as a group at 1, 5, 25, 50 and 100 m from a field margin in 17 sunflower fields 0-10 km distant from the nearest sierra. Honey-bees dominated the pollinator assemblage accounting for >90% of all visits to sunflower inflorescences. Honey-bee visitation was strongly affected by proximity to the sierras decreasing by about 70% in the most isolated fields. There was also a decline in honey-bee visitation with distance from the field margin, which was apparent with increasing field isolation, but undetected in fields nearby large expanses of natural habitat. The probability of observing a native visitor decreased with isolation from the sierras, but in other respects visitation by flower visitors other than honey-bees was mostly unaffected by the habitat factors assessed in this study. Overall, we found strong hierarchical and interactive effects between the study large and small-scale pollinator sources. These results emphasize the importance of preserving natural habitats and managing actively field verges in the absence of large remnants of natural habitat for improving pollinator services.

  6. Interactive effects of large- and small-scale sources of feral honey-bees for sunflower in the Argentine Pampas.

    Science.gov (United States)

    Sáez, Agustín; Sabatino, Malena; Aizen, Marcelo A

    2012-01-01

    Pollinators for animal pollinated crops can be provided by natural and semi-natural habitats, ranging from large vegetation remnants to small areas of non-crop land in an otherwise highly modified landscape. It is unknown, however, how different small- and large-scale habitat patches interact as pollinator sources. In the intensively managed Argentine Pampas, we studied the additive and interactive effects of large expanses (up to 2200 ha) of natural habitat, represented by untilled isolated "sierras", and narrow (3-7 m wide) strips of semi-natural habitat, represented by field margins, as pollinator sources for sunflower (Helianthus annus). We estimated visitation rates by feral honey-bees, Apis mellifera, and native flower visitors (as a group) at 1, 5, 25, 50 and 100 m from a field margin in 17 sunflower fields 0-10 km distant from the nearest sierra. Honey-bees dominated the pollinator assemblage accounting for >90% of all visits to sunflower inflorescences. Honey-bee visitation was strongly affected by proximity to the sierras decreasing by about 70% in the most isolated fields. There was also a decline in honey-bee visitation with distance from the field margin, which was apparent with increasing field isolation, but undetected in fields nearby large expanses of natural habitat. The probability of observing a native visitor decreased with isolation from the sierras, but in other respects visitation by flower visitors other than honey-bees was mostly unaffected by the habitat factors assessed in this study. Overall, we found strong hierarchical and interactive effects between the study large and small-scale pollinator sources. These results emphasize the importance of preserving natural habitats and managing actively field verges in the absence of large remnants of natural habitat for improving pollinator services.

  7. Aboveground and belowground biomass allocation in native Prosopis caldenia Burkart secondaries woodlands in the semi-arid Argentinean pampas

    International Nuclear Information System (INIS)

    Risio, Lucia; Herrero, Celia; Bogino, Stella M.; Bravo, Felipe

    2014-01-01

    The woodlands in the south-west of the Argentinean pampas are dominated by Prosopis Caldenia Burkart (calden). The current deforestation rate of this woodlands is 0.82% per year. Different compensation initiatives have begun that recognize the role of forests as environmental service providers. The financial incentives they offer make it necessary to quantify the amount of carbon stored in the forest biomass. A model for estimating calden biomass was developed. Thirty-eight trees were selected, felled and divided into sections. An equation system was fitted using joint generalized regression to ensure the additivity property. A weighted regression was used to avoid heteroscedasticity. In these woodlands fire is the main disturbance and it can modify tree allometry, due this all models included the area of the base of the stem and tree height as independent variables since it indirectly collects this variability. Total biomass and the stem fraction had the highest R2 A dj. values (0.75), while branches with a diameter less than 7 cm had the lowest (0.58). Tree biomass was also analyzed by partitioning into the basic fractions of stem, crown, roots, and the root/shoot ratio. Biomass allocation was greatest in the crown fraction and the mean root/shoot ratio was 0.58. The carbon stock of the caldenales considering only calden tree biomass is 20.2 Mg ha −1 . While the overall carbon balance of the region is negative (deforestation and biomass burning, the remnant forested area has increased their calden density and in an indirect way his carbon sequestration capacity could also be increased. - Highlights: • A model for estimating aboveground and belowground Prosopis caldenia biomass was developed. • Biomass allocation into the tree and the root/shoot ratio were analyzed. • The equation systems presented had made it possible to more accurately estimate the biomass stored in calden woodlands

  8. Glyphosate and AMPA, "pseudo-persistent" pollutants under real-world agricultural management practices in the Mesopotamic Pampas agroecosystem, Argentina.

    Science.gov (United States)

    Primost, Jezabel E; Marino, Damián J G; Aparicio, Virginia C; Costa, José Luis; Carriquiriborde, Pedro

    2017-10-01

    In the Pampas, public concern has strongly risen because of the intensive use of glyphosate for weed control and fallow associated with biotech crops. The present study was aimed to evaluate the occurrence and concentration of the herbicide and its main metabolite (AMPA) in soil and other environmental compartments of the mentioned agroecosystem, including groundwater, in relation to real-world agricultural management practices in the region. Occurrence was almost ubiquitous in solid matrices (83-100%) with maximum concentrations among the higher reported in the world (soil: 8105 and 38939; sediment: 3294 and 7219; suspended particulate matter (SPM): 584 and 475 μg/kg of glyphosate and AMPA). Lower detection frequency was observed in surface water (27-55%) with maximum concentrations in whole water of 1.80 and 1.90 μg/L of glyphosate and AMPA, indicating that SPM analysis would be more sensitive for detection in the aquatic ecosystem. No detectable concentrations of glyphosate or AMPA were observed in groundwater. Glyphosate soil concentrations were better correlated with the total cumulative dose and total number of applications than the last spraying event dose, and an increment of 1 mg glyphosate/kg soil every 5 spraying events was estimated. Findings allow to infer that, under current practices, application rates are higher than dissipation rates. Hence, glyphosate and AMPA should be considered "pseudo-persistent" pollutants and a revisions of management procedures, monitoring programs, and ecological risk for soil and sediments should be also recommended. Copyright © 2017 Elsevier Ltd. All rights reserved.

  9. The role of phytophysiognomies and seasonality on the structure of ground-dwelling anuran (Amphibia) in the Pampa biome, Southern Brazil.

    Science.gov (United States)

    Maragno, Franciéle P; Santos, Tiago G; Cechin, Sonia Z

    2013-09-01

    Considering that habitat use by amphibians is related both with climate and environmental features, we tested the hypothesis that anuran assemblages found in different phytophysiognomies and in different seasons vary in structure. Additionally, we searched for species which can be indicators of habitat and seasons. The study was conducted in the Pampa biome, southern Brazil. Sampling was done through pitfall traps placed in three phytophysiognomies: grassland, ecotone grassland/forest; and forest. The seasonality factor was created by grouping months in warn and cold seasons. Sixteen species were found and the assemblages were influenced both by phytophysiognomies and climatic seasonality. In a paired comparison, the three phytophysiognomies differed in structure of assemblage from each other. Physalaemus henselii, P. riograndensis, Pseudopaludicola falcipes and Pseudis minuta were indicators of ecotone. Leptodactylus gracilis and Physalaemus biligonigerus were indicators of grassland. None species was indicator of forest. Most of the species were indicators of warm season: Elachistocleis bicolor, Leptodactylus fuscus, L. gracilis, L. latinasus, L. latrans, L. mystacinus, Physalaemus biligonigerus, P. cuvieri and Pseudis minuta. None species was indicator of cold season. We found that even for species of open areas, as Pampa, heterogeneous phytophysiognomies are important for maintaining abundance and constancy of populations of anuran.

  10. So far away, yet so close: strong genetic structure in Homonota uruguayensis (Squamata, Phyllodactylidae, a species with restricted geographic distribution in the Brazilian and Uruguayan Pampas.

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    Jéssica F Felappi

    Full Text Available The Pampas is a biologically rich South American biome, but is poorly represented in phylogeographic studies. While the Pleistocene glacial cycles may have affected the evolutionary history of species distributed in forested biomes, little is known about their effects on the habitats that remained stable through glacial cycles. The South American Pampas have been covered by grasslands during both glacial and interglacial periods and therefore represent an interesting system to test whether the genetic structure in such environments is less pronounced. In this study, we sampled Pampean populations of Homonota uruguayensis from Southern Brazil and Uruguay to assess the tempo and mode of population divergence, using both morphological measurements and molecular markers. Our results indicate that, in spite of its narrow geographic distribution, populations of H. uruguayensis show high levels of genetic structure. We found four major well-supported mtDNA clades with strong geographic associations. Estimates of their divergence times fell between 3.16 and 1.82 million years before the present. Populations from the central portion of the species distribution, on the border between Uruguay and Brazil, have high genetic diversity and may have undergone a population expansion approximately 250,000 years before the present. The high degree of genetic structure is reflected in the analyses of morphological characters, and most individuals could be correctly assigned to their parental population based on morphology alone. Finally, we discuss the biogeographic and conservation implications of these findings.

  11. Reprint of "Survey and first molecular characterization of Echinococcus granulosus sensu stricto (G1) in Pampas fox (Lycalopex gymnocercus) in Buenos Aires province, Argentina".

    Science.gov (United States)

    Scioscia, Nathalia Paula; Petrigh, Romina Sandra; Beldomenico, Pablo Martín; Fugassa, Martín; Denegri, Guillermo María

    2017-01-01

    Echinococcosis is a zoonosis caused by tapeworms of the genus Echinococcus. Echinococcus granulosus sensu lato (s. l.) has a world-wide distribution and its transmission is primarily maintained in a synanthropic cycle with dogs as definitive hosts and livestock species as intermediate hosts. However, many wild canids also function as definitive hosts for E. granulosus s. l. Echinococcosis in humans is mainly caused by E. granulosus sensu stricto (s. s.) G1 genotype. In the present work, we expanded the epidemiological study on echinococcosis reported cases in Pampas fox (Lycalopex gymnocercus) to provide a prevalence estimate for rural areas of southern Buenos Aires province, Argentina. Ninety-five whole intestines were analyzed using the sedimentation and counting technique with a result of 83 foxes (87.37%) harboring at least one helminth species. E. granulosus s. l. adults were found in one Pampas fox (1.05%). These adult helminthes were E. granulosus s. s. (G1) according to the genotyping analysis of a 450-bp region of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene. Copyright © 2016 Elsevier B.V. All rights reserved.

  12. NUEVOS APORTES AL CONOCIMIENTO DE LA HERPETOFAUNA DE LA FORMACIÓN CERRO AZUL (MIOCENO SUPERIOR, PROVINCIA DE LA PAMPA, ARGENTINA

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    AGUSTÍN SCANFERLA

    2015-01-01

    Full Text Available RESUMENSe describen nuevos materiales fósiles de anfibios y reptiles hallados en sedimentos referidos a la Formación Cerro Azul (Mioceno Superior, procedentes de numerosas localidades de la provincia de La Pampa, Argentina. Los nuevos registros se basan en un resto craneano de anuro asignado al géneroCeratophrys, restos de caparazón de tortugas terrestres del géneroChelonoidis, vértebras asignables al lagarto de la familia TeiidaeTupinambis, y una vértebra troncal de serpiente comparable al género de colubroideos actualesPhilodryas. Tanto los registros terciarios previos de géneros actuales de anfibios y reptiles en América del Sur, como así también la asociación recuperada en el Mioceno Superior de La Pampa sugieren que la mayoría de los géneros que componen la herpetofauna Neotropical estaban presentes en el Mioceno, patrón similar al observado en otras regiones del mundo.

  13. Effects of environmental conditions, human activity, reproduction, antler cycle and grouping on fecal glucocorticoids of free-ranging Pampas deer stags (Ozotoceros bezoarticus bezoarticus).

    Science.gov (United States)

    Garcia Pereira, Ricardo José; Barbanti Duarte, José Maurício; Negrão, João Alberto

    2006-01-01

    In this study, a commercial enzyme immunoassay (EIA) was validated in detecting glucocorticoids in Pampas deer feces, in order to investigate the influence of several factors on the adrenocortical function. Fecal samples, behavioral data and information concerning male grouping and antlers status were collected at a monthly basis during a 1 year period from free-ranging stags living at Emas National Park, Brazil (18 degrees S/52 degrees W). The results revealed that concentrations of fecal glucocorticoids in winter were significantly higher than those corresponding to spring and summer. In addition, dry season data presented higher levels than during the wet season. Significant difference was found between fecal levels of breeding stags in summer and nonbreeding stags, whereas no difference was observed between breeding stags in winter and nonbreeding stags. On the other hand, males from areas with frequent human disturbance exhibited higher glucocorticoid concentrations and flight distances than individuals from areas of lower human activity. Males with antlers in velvet had elevated levels compared with animals in hard antler or antler casting. Also, we found that glucocorticoid levels were higher in groups with three or more males than in groups with only one male. The flight distances showed positive correlation with fecal glucocorticoid. These data indicate that fecal glucocorticoid provides a useful approach in the evaluation of physiological effects of environment, inter-individuals relationship and human-induced stressors on free-ranging Pampas deer stags.

  14. Pollen deposition in tauber traps and surface soil samples in the Mar Chiquita coastal lagoon area, pampa grasslands (Argentina

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    Fabiana Latorre

    2010-12-01

    Full Text Available Estimations of airborne pollen loadings deposited in Tauber traps were studied in a coastal lagoon from south-eastern Pampa grasslands, Argentina, in order to assess their relationship with surface samples and to interpret the representativeness of local, regional and extraregional vegetation. Three different environments were considered: a coastal dune barrier with a psammophytic community, a salt marsh with a halophytic community in Mar Chiquita lagoon, and a freshwater community at Hinojales freshwater lake. Based on a record of surface samples taken from a previous paper, a parametric model was built to classify Tauber samples gathered from the natural vegetation communities of the study area. Results revealed that just like their surface counterparts, Tauber trap records qualitatively reflect the predominant vegetation types, although ecological groups feature different quantitative representations depending on the record type. Pollen loadings showed that airborne pollen transport was predominantly of local range, in accordance with previous results from the same study area. Airborne - surface samples relationships enrich our knowledge of the present environment that could be useful to improve paleoecological interpretations of the area.Se estimó el depósito polínico atmosférico de trampas Tauber en una laguna costera del sudeste de la estepa pampeana argentina, con el objetivo de analizar su relación con muestras de polen superficial e interpretar la representatividad de la vegetación local, regional y extraregional. Se consideraron tres ambientes diferentes: una barrera costera de dunas con vegetación psamofítica, la marisma de la laguna costera Mar Chiquita, con vegetación halofítica, y la laguna continental Hinojales, con vegetación hidrofítica. En base a las muestras de superficie y análisis de un trabajo previo, se construyó un modelo paramétrico para clasificar las muestras Tauber tomadas en la vegetación natural del

  15. Effect of Conversion from Natural Grassland to Arable Land on Soil Carbon Reserve in the Argentinean Rolling Pampas

    Science.gov (United States)

    Andriulo, A. E.; Irizar, A. B.; Mary, B.; Wilson, M. G.

    2012-04-01

    (3.5 and 3.3 Mg ha-1 corresponding to 31Y and 80Y, respectively). The lower loss of carbon in 80Y compared to 30Y can be explained by the accumulation of stable SOC fractions produced by the burnt stubble. We conclude that current agricultural systems of the Rolling Pampas are not sustainable.

  16. Distribuição temporal e espacial de anuros em área de Pampa, Santa Maria, RS Temporal and spatial distribution of anurans in the Pampa Region (Santa Maria, RS

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    Tiago Gomes dos Santos

    2008-06-01

    Full Text Available Este estudo teve como objetivo determinar a riqueza, a constância de ocorrência, os modos reprodutivos, o padrão de distribuição da abundância, a temporada de vocalização e testar a correlação das variáveis climáticas sobre a atividade de vocalização dos anuros em uma região do Bioma Pampa, Santa Maria, Rio Grande do Sul. Durante o período de novembro de 2001 a outubro de 2002 foram realizadas coletas mensais empregando o método de ‘busca em sítio de reprodução’ e exame de exemplares depositados na Coleção Herpetológica do Setor de Zoologia da Universidade Federal de Santa Maria (ZUFSM. Foi registrada a ocorrência de 25 espécies de anuros. A anurofauna registrada corresponde a 30% das espécies encontradas no Rio Grande do Sul e normalmente está associada a áreas abertas encontradas no estado e em países vizinhos. Foram registrados quatro modos reprodutivos: modo 1 (14 espécies; 58,3%; modos 11 e 30 (nove espécies; 37,5% e modo 24 (uma espécie; 4,2%. A baixa diversificação de modos reprodutivos provavelmente está relacionada à homogeneidade do hábitat primariamente campestre. A maior parte das espécies mostrou-se constante ou acessória na área estudada e o padrão de distribuição da abundância das espécies apresentou ajuste aos modelos Broken Stick e Log-normal, caracterizados pela homogeneidade na distribuição da abundância das espécies. A maioria das espécies apresentou grande plasticidade na ocupação de hábitats, mas poucas foram plásticas no uso dos sítios de vocalização. Houve correlação positiva, ainda que fraca, da riqueza de espécies com a precipitação mensal acumulada e da abundância com a temperatura média máxima. As correlações obtidas indicaram que na área estudada a temperatura parece atuar mais sobre a abundância de machos em atividade de vocalização e a precipitação sobre a riqueza, apesar da riqueza de espécies ser significativamente maior durante o per

  17. Atributos del suelo y paisaje asociados a la variabilidad de rendimientos de maíz en la pampa arenosa Soil attributes associated to corn yield variability in the sandy pampas

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    Susana Urricariet

    2011-07-01

    Full Text Available La variabilidad espacial de las propiedades de los suelos y su asociación con la posición en el paisaje es requerida en la aplicación de tecnología manejo sitio-específico. Los rendimientos de los cultivos son altamente variables dentro de un lote como resultado de complejas interacciones entre topografía, atributos del suelo y prácticas de manejo. Los objetivos del trabajo fueron: caracterizar la distribución espacial de la capacidad de agua disponible utilizando funciones de edafotransferencia e identificar los atributos de suelo asociados a la variabilidad de rendimientos de maíz a escala de lote en suelos de la Pampa Arenosa. En dos lotes de producción de maíz, se delimitaron parcelas de 8 ha y 10 ha obteniéndose a cosecha el mapa de rendimiento. Previo a la siembra del cultivo, se realizó un muestreo de suelos georreferenciado con un diseño en grilla. Se tomaron 32 muestras en el Sitio 1 (8 ha y 42 muestras en el Sitio 2 (10 ha y se determinó CO y composición granulométrica. Mediante funciones de edafotransferencia se estimó la capacidad de agua disponible (CAD. En tres perfiles representativos de los suelos presentes (Hapludol Típico, Hapludol Éntico y Hapludol Éntico, fase convexa se determinó el agua retenida a -33 kPa y -1.500 kPa, composición granulométrica y CO para seleccionar la función de edafotransferencia de mayor ajuste. Se utilizaron procedimientos geoestadísticos para el análisis de los resultados. La CAD del perfil hasta un metro de profundidad fue de 121 mm para el Hapludol Típico y 78-79 mm para ambos Hapludoles Énticos. El Sitio 1 presentó mayor variabilidad entre posiciones topográficas en el contenido de arena (40 a 81% que el Sitio 2 (43 a 73% mostrando moderada asociación espacial de los resultados. La CAD presentó asociación espacial moderada en el Sitio 1 mientras que en el Sitio 2 no se observó comportamiento espacial. En el Sitio 1 los rendimientos presentaron fuerte dependencia

  18. PRÁCTICAS DE CONSUMO DE BEBIDAS ETÍLICAS EN UNA “CASA DE NEGOCIOS” PAMPEANA DE FINES DEL SIGLO XIX. ANÁLISIS DE PRECINTOS DE PLOMO Y DE FRAGMENTOS VÍTREOS (POSTA EL CALDÉN, DEPARTAMENTO DE REALICÓ, LA PAMPA / Alcohol consumption practices at a pampa´s ge

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    Virginia Pineau

    2014-11-01

    Full Text Available En el marco del proyecto Ubacyt F 095 que tiene como parte de sus objetivos estudiar y comprender el poblamiento del norte de la provincia de La Pampa posterior a las campañas militares de fines del siglo XIX, se presenta el análisis de los precintos de plomo y fragmentos vítreos provenientes del sitio Posta el Caldén (sección I, fracción A, lote 24. Dicho sitio se trata de una posta de caminos y casa de negocios ocupada hacia fines del siglo XIX. La misma pertenecía a una línea de postas entre las ciudades de Victorica (Provincia de La Pampa y General Villegas (Provincia de Buenos Aires. Se realizarán análisis morfológico – funcional, metalográfico mediante microscopia óptica (LM y electrónica de barrido (SEM y químico utilizando espectroscopia de rayos X dispersiva en energía (EDS de las piezas bajo estudio. El objetivo fue determinar tipos de bebidas alcohólicas consumidas y procedencia de las mismas. Se identificaron diversos tipos y marcas de bebidas de tenor etílico, se determinó que el material de confección de los precintos era de plomo recubierto con estaño típico de la técnica de confección denominada roll bonding. Esta información será de utilidad a la hora de estudiar las prácticas sociales de estos nuevos grupos de inmigrantes en combinación con las fuentes escritas y la historia oral.   Palabras Clave: Bebidas alcohólicas, Siglo XIX, La Pampa.     Abstract Within the framework of Ubacyt F 095 project that has as part of its aims to study the settlement of the northern province of La Pampa after the military campaigns of the late nineteenth century. We present the analysis of lead seals and fragments vitreous from the site Posta Caldén (Section I, Dept A, lot 24. This site is a crossroad post and a grocery store in the late nineteenth century. It belonged to a line of posts between the cities of Victorica (Province of La Pampa and General Villegas (Province of Buenos Aires. Morphological and

  19. El impacto diferenciado en las afectaciones a los derechos humanos de niñas y niños: una categoría de análisis propia desde una perspectiva de infancia

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    Luis González Placencia

    2013-06-01

    Full Text Available El artículo propone una perspectiva de infancia como categoría de análisis que permite identificar el impacto diferenciado de ciertas violaciones a los derechos de niñas y niños. Asimismo, reconoce que el análisis con perspectiva de infancia se encuentra fundado en la doctrina de la protección integral de los derechos de la infancia e incluye el reconocimiento de niñas y niños como sujetos de derechos; una visión amplia del principio de igualdad sustancial; y la eficacia del principio delinterés superior de la niña y el niño. Particularmente, el estudio analiza cómo el concepto general de plazo razonable no es suficiente para asegurar las medidas especiales de protección de los derechos de niñas y niños, por lo que resulta necesaria la identificación de medidas reforzadas que eviten la generación de impactos agravados a sus derechos.

  20. [Campylobacter spp.: prevalence and pheno-genotypic characterization of isolates recovered from patients suffering from diarrhea and their pets in La Pampa Province, Argentina].

    Science.gov (United States)

    Tamborini, Ana L; Casabona, Luis M; Viñas, María R; Asato, Valeria; Hoffer, Alicia; Farace, María I; Lucero, María C; Corso, Alejandra; Pichel, Mariana

    2012-01-01

    The prevalence of Campylobacter spp. was investigated in 327 patients suffering from diarrhea and in 36 animals (dogs, cats and chickens) owned by the patients that presented infection by Campylobacter in Santa Rosa, La Pampa, Argentina. Campylobacter spp. was isolated in 50/327 patients and in 12/36 animals, being Campylobacter jejuni the most common species. Resistance to ciprofloxacin (65 %) and tetracycline (32 %) was found among 35 isolates of human origin studied. Seven genetic subtypes were observed among 13 C. jejuni isolates by pulsed field gel electrophoresis. Two subtypes grouped isolates belonging to patients and their respective dogs whereas another subtype grouped one isolate of human origin and two isolates from the patient's chickens. The results of this investigation highlight the need to strengthen surveillance of Campylobacter spp. not only in poultry, which is recognized as the main reservoir, but also in pets, which were shown to be asymptomatic carriers of the pathogen.

  1. Preliminary results of ERTS-investigations by W-German investigations. [multidisciplinary geoscientific experiments in central Germany and hydrogeology of Argentina Pampas

    Science.gov (United States)

    Muehlfeld, R.

    1974-01-01

    Results are presented of West German investigations into multidisciplinary geoscientific experiments in central Germany and the Alps, and hydrogeological investigations in the Pampa of Argentina based on ERTS-1 data. The main goals of the investigation were achieved. The studies have given a good idea of the possibilities and limitations of ERTS imagery depending on the objectives in question and on the geographical conditions of the areas under investigation. Even in the well known region of central Europe, ERTS has proven its ability of improving present knowledge. In fields such as pollution monitoring and regional planning the satellite techniques should have distinct practical value. For any regional study of less known areas, the value of ERTS imagery can hardly be overestimated.

  2. Examining Basin-Scale Water and Climate Relations across the Pampa del Tamarugal, Atacama Desert through Spatial Analysis of Hydrogen, Carbon and Oxygen Isotopes in Tree Rings

    Science.gov (United States)

    Olson, E. J.; Dodd, J. P.; Rivera, M. A.

    2016-12-01

    Arid regions are extremely sensitive to variations hydroclimate. However, our understanding of past hydroclimate variations in these regions is often limited by a paucity of spatially resolved proxy data. The Atacama Desert of northern Chile is one of the driest regions on Earth, and hydroclimatic processes in the Atacama Desert may be a useful proxy for understanding the implications of expanding global aridity. In order to assess the ability of tree-ring isotope studies to record changes in hydrology and terrestrial climate in the Atacama Desert, oxygen (δ18O), carbon (δ13C) and hydrogen (δ2H) isotope values in tree rings of Prosopis tamarugo are analyzed for the modern period (1954-2014) when anthropogenic change to regional groundwater levels have been most notable. Samples of wood cellulose were collected throughout the Pampa del Tamarugal basin from 14 individuals and used to create an interpolated surface of isotope variations. The isotope data were then compared to groundwater depth from well monitoring data provided by the Dirección de General de Agua of Chile. There is a significant correlation between groundwater level and isotope values with best agreement occurring during the past two decades for δ18O (r = 0.58), δ13C (r = 0.55), and δ2H (r = 0.66) values. This spatial correlation analysis reveals that tree ring a-cellulose isotope values are a suitable proxy for reconstructing groundwater depth in the Pampa del Tamarugal Basin. A stepwise multiregression analysis between δ18O values of cellulose and several other environmental variables including groundwater level, relative humidity, and temperature suggest that groundwater depth is the dominate control of variation in the modern δ18O tree ring record. The response of tree cellulose to the hydroclimate in this region suggests that tree ring isotope variations may be used to reconstruct past hydroclimate conditions in arid regions throughout the globe.

  3. Oxidative stress markers in fish (Astyanax sp. and Danio rerio) exposed to urban and agricultural effluents in the Brazilian Pampa biome.

    Science.gov (United States)

    Costa-Silva, D G; Nunes, M E M; Wallau, G L; Martins, I K; Zemolin, A P P; Cruz, L C; Rodrigues, N R; Lopes, A R; Posser, T; Franco, J L

    2015-10-01

    Aquatic ecosystems are under constant risk due to industrial, agricultural, and urban activities, compromising water quality and preservation of aquatic biota. The assessment of toxicological impacts caused by pollutants to aquatic environment using biomarker measurements in fish can provide reliable data to estimate sublethal effects posed by chemicals in contaminated areas. In this study, fish (Astyanax sp. and Danio rerio) exposed to agricultural and urban effluents at the Vacacaí River, Brazil, were tested for potential signs of aquatic contamination. This river comprehends one of the main watercourses of the Brazilian Pampa, a biome with a large biodiversity that has been neglected in terms of environmental and social-economic development. Sites S1 and S2 were chosen by their proximity to crops and wastewater discharge points, while reference site was located upstream of S1 and S2, in an apparently non-degraded area. Fish muscle and brain tissues were processed for determination of acetylcholinesterase as well as oxidative stress-related biomarkers. The results showed signs of environmental contamination, hallmarked by significant changes in cholinesterase activity, expression of metallothionein, antioxidant enzymes, glutathione levels, and activation of antioxidant/cell stress response signaling pathways in fish exposed to contaminated sites when compared to reference. Based on these results, it is evidenced that urban and agricultural activities are posing risk to the environmental quality of water resources at the studied area. It is also demonstrated that cell stress biomarkers may serve as important tools for biomonitoring and development of risk assessment protocols in the Pampa biome.

  4. Effect of the californian red worm (Eisenia foetida during the composteo and vermicomposteo in properties of the Experimental Station of the Academic Rural Unit Carmen Pampa

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    Paco Gabriel

    2011-08-01

    Full Text Available The objective of the present work was to evaluate the biotransformación of the organic residuals, of kitchen (Rc remains, pulp of coffee (Pc and cardboard (C by means of compostaje methods and vermicompostaje. The investigation was taken I end up in the Experimental Station, module of lombricultura of the Career of Agronomic Engineering of Carmen Pampa Unit Academic Campesina, located in the community of Carmen Pampa of the Municipality of Coroico Department of La Paz, Bolivia. The used design was totally at random with 3 treatments and 3 repetitions, to compare among obtaining methods in quality it used the test of fixed effects and it stops quantity the test "t" of Student. The quantity of initial sustrato studied in compostaje was of 1m3 and 0,02m3 vermicompostaje ending up culminating the investigation in 120 days. The results in decomposition are obtained in smaller time by means of the method vermicompostaje in Pc in advance of three months of 98.33% continued by C and Rc; while in compostaje it was the treatment with Rc of 3 months with 3 weeks with 90.40% of decomposition, continued by Pc and C. In quantity, starting from 1m3 of initial sustrato bigger bioabono was obtained with Pc 271.62 kg, 465.83 kg, Rc 249.71 kg, 446.00 kg and C 212.48 kg, 404.00 kg, in compost and vermicompost respectively. The chemical composition of the bioabonos of Rc, Pc, C in N and P is tipificados like first floor, high K, Ca in low compost and half vermicompost, half Mg, MO under and lightly alkaline pH to neuter in the two obtaining methods.

  5. Nanoemulsion for improving solubility and permeability of Vitex agnus-castus extract: formulation and in vitro evaluation using PAMPA and Caco-2 approaches.

    Science.gov (United States)

    Piazzini, Vieri; Monteforte, Elena; Luceri, Cristina; Bigagli, Elisabetta; Bilia, Anna Rita; Bergonzi, Maria Camilla

    2017-11-01

    The purpose of this study was to develop new formulation for an improved oral delivery of Vitex agnus-castus (VAC) extract. After the optimization and validation of analytical method for quali-quantitative characterization of extract, nanoemulsion (NE) was selected as lipid-based nanocarrier. The composition of extract-loaded NE resulted in triacetin as oil phase, labrasol as surfactant, cremophor EL as co-surfactant and water. NE contains until 60 mg/mL of extract. It was characterized by DLS and TEM analyses and its droplets appear dark with an average diameter of 11.82 ± 0.125 nm and a polydispersity index (PdI) of 0.117 ± 0.019. The aqueous solubility of the extract was improved about 10 times: the extract is completely soluble in the NE at the concentration of 60 mg/mL, while its solubility in water results less than 6 mg. The passive intestinal permeation was tested by using parallel artificial membrane permeation assay (PAMPA) and the permeation across Caco-2 cells after preliminary cytotoxicity studies were also evaluated. NE shows a good solubilizing effect of the constituents of the extract, compared with aqueous solution. The total amount of constituents permeated from NE to acceptor compartment is greater than that permeated from saturated aqueous solution. Caco-2 test confirmed PAMPA results and they revealed that NE was successful in increasing the permeation of VAC extract. This formulation could improve oral bioavailability of extract due to enhanced solubility and permeability of phytocomplex.

  6. Procesos de subalternización de la población indígena en Argentina: los ranqueles en La Pampa, 1870-1970

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    Salomón Tarquini, Claudia

    2011-08-01

    Full Text Available As a result of the military campaigns of 1878-1885, known in Argentina as “The Conquest of the Desert”, the indigenous populations tried different strategies to face the adverse conditions and the policies that sought their subalternization and invisibilization. This work explores the peculiarities of the process carried out by the ranquel ethnic group, in the Pampa (initially a National Territory that later became a province in 1952 from the last years of their autonomy up until the 1970s. The study is based on the cross-checking of different sources that, reducing the range of the analysis uses the trajectory of the groups that were tied to the cacique Ramon Cabral, El Platero, as an example of such processes.A partir de las campañas militares de 1878-1885, conocidas en Argentina como «Conquista del Desierto», las poblaciones indígenas ensayaron distintas estrategias para enfrentar las condiciones adversas y las políticas que pretendían su subalternización e invisibilización. Este trabajo explora las particularidades del proceso protagonizado por el grupo étnico ranquel en La Pampa (primero Territorio Nacional y luego provincia a partir de 1952 desde los últimos años de su autonomía y hasta la década de 1970. El estudio se basa en una triangulación de fuentes de diverso tipo que, reduciendo la escala de análisis, toma como ejemplo la trayectoria de las agrupaciones ligadas al cacique Ramón Cabral, El Platero.

  7. Incidence and control of bovine gastrointestinal nematodes in the East of the Province of La Pampa, Argentina

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    LORDI, L.V

    2011-04-01

    Full Text Available A cross-sectional survey including 350 stocking farms and bovine establishments that operate the full cycle (FC as well as fattening operations (IN was carried out in the East of the Province of La Pampa to record cases of verminous gastroenteritis (VGE as well as control and management practices applied by the farmers.Farms were stratified by herd size into three categories: more than 900 (G, 900-500 (M and 500-300 (P bovines. Samples from each category were collected at random. 33% of the farmers surveyed indicated that their animals had been affected by clinical cases of VGE with morbidity and mortality rates between 11.2% and 0.42%, respectively. More cases of VEG (P<0.004, X2 8.33 occurred in herds on FC establishments (37% that on fattening farms (IN (21%; the relative risk (RR was 1.77 (95%; IC 1.18 – 2.74 but no differences were noted between categories. Ninety-four percent of the farmers use avermectins alone (AVM (71% or combined with benzimidazole (BZD, 20% or levamisole (3%; 6% use BZD alone. The percentage of use of other drugs in addition to AVM increases (P<0.005, X2 7.80 with larger herds (G: 32%, M: 21%, P: 15%. Of the treatments, 95.2% include avermectins alone in injectable form (82.6% or combined with oral (16.5% or intraruminal (0.9% forms. Approximately 2.42 treatments per year are performed and are more prevalent (P<0.01 in G and IN farms (2.7 treatments. 35% of the farmers deworm twice a year, in the fall (between March and July and in late winter-spring (between August and October-, 16% deworm only once (between February and April and 12% twice (between late summer and early winter. 18% of the farmers (G: 24%, M: 18%; P: 13% prevent VGE losses by administering treatment at a specific time of the year. 60% of the farmers consult the veterinarian although only 29% perform an egg count (hpg although differences (P<0.001 between herd sizes were noted: G: 41%, M: 26%; P 19%. 12% (FC 10%; IN 16%. 12% of the farmers (FC 10

  8. Incidencia y control de los nematodes gastrointestinales bovinos en el Este de la provincia de La Pampa, Argentina

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    LORDI, L

    2011-04-01

    Full Text Available Se efectuó una encuesta transversal en 350 establecimientos de ciclo completo y cría (CC e invernada (IN bovina, ubicados el este de la provincia de La Pampa con la finalidad de registrar los casos de gastroenteritis verminosa (GEV y las prácticas de control y manejo utilizadas por los ganaderos. La muestra fueron tomadas al azar a partir de 3 estratos de acuerdo al número de existencias bovinas: productores con más de 900 (G, de entre 900-500 (M y de 500 a 300 (P bovinos. El 33 % de los productores encuestados declaró haber tenido casos clínicos de GEV con una morbilidad y mortalidad del 11.2% y 0.42% respectivamente. Se registraron más casos de GEV (P<0.004, X2 8.33 en rodeos de CC (37% que en los de IN (21% con un resigo relativo (RR 1.77 (95%; IC 1.18 – 2.74, pero no se registraron diferencias entre estratos. El 94% de los encuestados utiliza avermectinas (AVM como droga única (71% o combinada con benzimidazoles (BZD, 20% o levamisol (3% y el 6% utiliza BZD únicamente. A mayor número de ganado (G: 32%, M: 21%, P: 15% la proporción del uso de las otras drogas además de AVM se incrementa (P<0.005, X2 7.80. El 95.2% se suministran en forma inyectable ya sea en forma única (82.6% o combinados con orales (16.5% o intrarruminales (0.9%. Se realizan en promedio 2,42 tratamientos anuales, siendo los productores G y los sistemas de IN (2.7 trat., los que más (P<0.01 tratamientos aplican. El 35% desparasita a su hacienda dos veces al año en el otoño (entre marzo y julio y a fines de invierno-primavera (entre agosto y octubre, mientras que el 16% lo hace una sola vez entre febrero y abril, y otro 12% trata dos veces desde fines de verano a principios de invierno. El 18% de los encuestados (G: 24%, M: 18%; P 13% previene pérdidas por GEV mediante un estrategia de tratamientos fijos en el tiempo. Un 60% de los productores consultan al veterinario, pero sólo el 29% realiza diagnóstico coprológico (hpg, existiendo diferencias (P<0

  9. Summer feeding ecology of Great Pampa-finches, Embernagra platensis at Laguna de Guaminí, Buenos Aires, Argentina

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    Laura M. Ferman

    2010-09-01

    Full Text Available The aim of this study was to assemble data on the summer feeding ecology of the Great Pampa-finch, Embernagra platensis at the Laguna de Guaminí, Buenos Aires, Argentina, and to explore the differences related to the dietary patterns for each sex between winter and summer when possible. The stomach contents of 43 birds were analyzed. The animal fraction was composed of Hymenoptera (45.1%, Coleoptera (32.4%, Lepidoptera (6.0%, Araneae (5% and Orthoptera (3.2%. The application of the index of relative importance (IRI resulted in 1490.4 for Coleoptera, 428.5 for Hymenoptera and 162.5 for Lepidoptera caterpillars. The vegetal fraction consisted of Triticum aestivum (26.9%, Cyperaceous (25%, Poaceae (Gramineae (19.3% and Panicum sp. (11.2%. The IRI values were 893.8 for Triticum aestivum, 174.5 for Gramineae, 126.5 for Panicum sp. and 112.8 for Scirpus sp. The food niche width was 0.33 for both sexes; the diversity index resulted in 1.06 for females and 1.33 for males and specific diversity ranged from 1.87 to 2.84. A canonical component analysis (CCA was performed on environmental and morphometric variables, and a Monte Carlo test confirmed the canonical correlations. A t-test showed that some birds harmonized with a logarithmic model and some with a geometric curve. During the summer, Embernagra platensis ingests Hymenoptera and Coleoptera more often than seeds, suggesting that two biological mechanisms could be taking place in this bird.O objetivo deste estudo foi reunir dados referentes à ecologia alimentar do Sabiá-do-banhado, Embernagra platensis, na laguna de Guaminí, Buenos Aires, Argentina, e explorar as diferenças relacionadas aos padrões dietéticos para cada sexo entre inverno e verão, quando possível. O conteúdo estomacal de 43 pássaros foi analisado. A fração animal foi composta por Hymenoptera (45,1%, Coleoptera (32,4%, Lepidoptera(6,0%, Araneae (5% e Orthoptera (3,2%. A aplicação do índice de importância relativa (IRI

  10. El estudio del anuncio de la adhesión a los niveles diferenciados de gobierno corporativo con la utilización de estudio de evento Event study of announcements about adherence to differentiated corporate governance levels

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    Gerlando Augusto Sampaio Franco de Lima

    2006-08-01

    Full Text Available Esta investigación tiene como objetivo verificar si la información suministrada al mercado de capitales sobre la intención de adhesión a los niveles diferenciados de Gobierno Corporativo de la BOVESPA genera retornos anormales en los precios de las acciones de esas compañías. Se espera que esa adhesión resulte en el aumento de la visibilidad de la empresa y negociación de sus papeles, como también, aumento en la cantidad de información divulgada a sus inversionistas. Para la investigación, se ha realizado un estudio de evento con una muestra de 18 empresas que habían emitido la información al mercado, teniendo como base los presupuestos de MacKinlay (1997. La regresión no paramétrica fue empleada para obtener los parámetros del modelo de mercado del estudio de evento, siendo esa herramienta obtenida a partir de la bibliografía de Dombrown, Rodriguez y Sirmans (2000 y Lima (2005. Los resultados del estudio de evento demostraron que no ocurrieron retornos anormales positivos en los precios de las acciones de las empresas, demostrando, así, que la información de adhesión a los Niveles Diferenciados de Gobierno Corporativo de la BOVESPA no fue captada, de forma general, por el mercado. A pesar de los resultados obtenidos y de las conclusiones presentadas, se debe tener en consideración algunas limitaciones de la investigación, como son las conclusiones obtenidas, las cuales se han quedado restringidas a la muestra, a las variables y a la herramienta econométrica utilizada.This research aims to verify if the information supplied to the stock market on the intention of adhesion to the Differentiated Levels of Corporate Governance on the São Paulo Stock Exchange generates abnormal returns in the stock prices of these companies. Adherence to this market is expected to result in the growth of company image, negotiability of its papers and the amount of information disclosed to its investors. An event study, based on the

  11. Aplicación del índice pronóstico AGES para el tratamiento del carcinoma bien diferenciado de la tiroides Application of AGES prognostic rate for treatment of a well differentiated thyroid carcinoma

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    Gimel Sosa Martín

    2009-09-01

    Full Text Available INTRODUCCIÓN. En la actualidad la selección del tratamiento quirúrgico adecuado en pacientes con carcinoma diferenciado de la tiroides en etapas tempranas es controversial. La presente investigación tuvo el objetivo de describir y evaluar los resultados del diagnóstico y tratamiento de esta enfermedad en un período de 5 años. MÉTODOS. Se realizó un estudio observacional, descriptivo con elementos analíticos incorporados, y prospectivo para la recolección de información de los pacientes atendidos por presentar nódulo de la tiroides, en el ISMM «Dr. Luis Díaz Soto», entre enero del 2002 y diciembre del 2006. A estos pacientes con cánceres bien diferenciados en etapas I y II según la clasificación internacional de tumores, ganglios y metástasis, se les aplicó de forma retrospectiva el índice de pronóstico AGES. RESULTADOS. La muestra estudiada estuvo constituida por 73 pacientes, de los cuales 69 eran mujeres (94,5 %. Del total de pacientes estudiados, 42 presentaron tumores benignos (57,5 % y 31, malignos (42,5 %. De los 31 casos diagnosticados como carcinomas mediante parafina, 21 obtuvieron puntuación menor de 4 según el índice AGES (menor riesgo, y solo 11 de estos (67,7 % recibieron una cirugía conservadora de la tiroides. CONCLUSIONES. Existió una buena concordancia entre la biopsia por aspiración con aguja fina y la parafina, por lo que la primera se considera de valor en la exploración de un nódulo de la tiroides. El índice AGES no siempre fue tomado en cuenta para la selección del tipo de cirugía, con tendencia a la cirugía más radical. Las complicaciones mayores se asociaron con mayor frecuencia a la cirugía radical.INTRODUCTION: At the present times, the selection a suitable surgical treatment for patients presenting with an early differentiated thyroid carcinoma is a controversial question. The aim of present research was to describe and to assessment the diagnosis results and the treatment of this

  12. GOVERNANÇA CORPORATIVA E DESEMPENHO ECONÔMICO: UMA ANÁLISE DOS INDICADORES DE DESEMPENHO ENTRE OS TRÊS NÍVEIS DO MERCADO DIFERENCIADO DA BM&FBOVESPA

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    Sérgio Henrique de Oliveira Lima

    2015-08-01

    Full Text Available La gobernanza corporativa, surgida con la intención de resolver o disminuir los conflictos deagencia, parece tener el beneficio adicional de incrementar el valor de mercado de las empresas que lapractican en elevados niveles. Estudios empíricos realizados en Brasil, Estados Unidos y Europa han dejadoen evidencia los beneficios de rendimiento económico obtenido por las empresas con buenas prácticas degobernanza en relación a aquellas que no las adoptan. Tomando una línea alternativa – y complementar –de investigación, este estudio analiza la relación entre los diferentes niveles de gobernanza corporativa delas empresas y el aumento de su valor de mercado, o sea, examina si para niveles más elevados degobernanza hay mejor rendimiento económico. Fueron analizadas las 182 empresas del mercadodiferenciado de la BM&FBOVESPA, por ser las que presentan los niveles más elevados de gobernanzacorporativa, agrupadas en los tres diferentes segmentos de la lista – Nuevo Mercado, Nivel 2 y Nivel 1 – yrelacionadas con su valor de mercado. Los datos fueron analizados con base en la estadística descriptiva yanálisis inferencial, testes de media y análisis de variancia. Se han obtenido evidencias de que las empresaslistadas en los niveles más elevados del mercado diferenciado poseen mejor rendimiento económico, medidoen términos de variación media del valor de mercado.

  13. Searching Jesuit´s footsteps in the Argentinean pampas: the misión “Nuestra Señora de la Purísima Concepción de los Indios Pampas” (1740-1753

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    Victoria Pedrotta

    2017-03-01

    Full Text Available In may 1740, Jesuits Querini and Strobel started the mission “Nuestra Señora de la Purísima Concepción de los Indios Pampas”, at the mouth of the Salado River in the Argentinean pampas, thus beginning an ambitious evangelizer project for the indigenous groups that inhabited in the Pampa and Patagonia lands. Within a few years, the new town had to be moved to a nearby site, where settled until 1753. This paper presents the analysis of the document database collected in the context of archaeological investigations that we began in 1998, focused on aspects related to the mission geographical environment, its initial population, buildings and layout, as well as the information about the current location of the two settlements that consecutively formed it.

  14. Metilación y expresión de genes en el cáncer diferenciado de tiroides Methylation and expression of genes in thyroid differentiated cancer

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    María Teresa Marrero Rodríguez

    2010-12-01

    Full Text Available En los últimos años ha cobrado importancia el estudio de las alteraciones epigenéticas en el desarrollo del cáncer. La metilación del ácido desoxirribonucleico es el cambio epigenético más frecuente e importante hasta ahora estudiado, y tiene un importante papel en la regulación transcripcional de genes. Recientemente se ha observado que existen patrones de metilación anormales en muchos tipos de cánceres, incluyendo el cáncer de tiroides, los cuales conducen a la inactivación de genes supresores de tumores y a la inestabilidad del genoma. La metilación de genes específicos, tales como, el cotransportador de yodo/sodio, la tiroglobulina y el receptor de la hormona estimulante del tiroides en el cáncer diferenciado de tiroides, es una de las causas de fallo en el tratamiento de los pacientes con esta enfermedad. Se ha iniciado el tratamiento con agentes desmetilantes en los pacientes con cáncer de tiroides que presentan una alteración genética por metilación, a fin de corregir estas alteraciones, restablecer la función, y con ello, la posibilidad de que el tratamiento sea efectivo.In past years the study of epigenetic alterations in the cancer development becomes significance. The methylation of desoxyribonucleic acid is the more frequent and important epigenetic change until now studied and play a significant role in the transcription regulation of genes. Recently it was noted the existence of abnormal methylation patterns in many types of cancer, including the thyroid one, which leading to inactivation of tumor suppressors genes and to genome instability. The methylation of specific genes such as the co-transporter of iodine/sodium, the thyroglobulin and the receptor of thyroid stimulant hormone (TSH in the thyroid differentiated cancer, is one of the failure cause in treatment of patients presenting this disease. In patients with thyroid cancer it has been initiated a treatment with demethylation agents in patients with

  15. HPTLC-profiling of eleutherosides, mechanism of antioxidative action of eleutheroside E1, the PAMPA test with LC/MS detection and the structure–activity relationship

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    Daniel Załuski

    2018-03-01

    Full Text Available Human body is constantly generating free radicals, which causes oxidative stress. Despite naturally occurring antioxidant systems in human body, free radicals cause lipid, proteins and DNA oxidation. New antioxidants are still urgent as well as their mechanisms of action should be explained. In this study, we investigated the mechanism by which eleutherosides B, E and E1 may act as antioxidants, identified eleutherosides in Eleutherococcus lasiogyne and Eleutherococcus giraldii, and explained in vitro the absorption of eleutheroside E1 based on passive transport. The DPPH∗ and DB-HPTLC tests were used to assess the antioxidant activity. Of the three eleutherosides, only eleutheroside E1 exhibited a strong anti-DPPH∗ activity (EC50 37.03 μg/mL; 63 mMol compared to the raw extracts (EC50 170 and 180 μg/mL for E. lasiogyne and E. giraldii. This activity was also confirmed by the DB-HPTLC autography technique. According to Załuski’s hypothesis, the antioxidant mechanism of eleutheroside E1 is based on the complexation of DPPH∗ molecule with its aryl radical. During this reaction, the aryl radical of eleutheroside E1 (E1∗ and DPPHH are created. Next, the aryl radical (E1∗ is complexed with another DPPH∗ molecule. Additionally, the aryl radical can be stabilized by the presence of the methoxy groups in the aromatic ring, which increases its antioxidative action. The HPTLC-identification of extracts showed the presence of eleutherosides B, E and E1 in both species. The PAMPA test coupled with LC/MS detection showed a low permeability of eleutheroside E1 across artificial membrane. Because eleutherosides belong to the polyphenols, the TPC and TFC were quantified. The TPC and TFC varied from 51.4 to 49.3 mg/g dry extract for TPC, and from 5.73 to 4.91 mg/g dry extract for TFC, for E. giraldii and E. lasiogyne, respectively. In conclusion, eleutheroside E1 in its pure form could be a chemopreventive ingredient of new pharmacological

  16. Fijación de radioyodo en huesos maxilares simulando metástasis en pacientes con Carcinoma Diferenciado de Tiroides (CDT): False- Positive images in patients with Differentiated Thyroid Carcinoma. (DTC) Uptake of 131-I in maxillary bones mimicking salivary glands

    OpenAIRE

    O. J. Degrossi; S. Gutiérrez; A. Fadel; E. B. Degrossi; M. C. Valdivieso; R. L. Balbuena; M. del C. Alak; M. de Cabrejas

    2008-01-01

    En estudios centellográficos con 131I (CCT) para seguimiento, postablación o tratamiento de pacientes portadores de carcinoma diferenciado de tiroides (CDT) se observan frecuentemente en tiempos precoces áreas de captación del radiotrazador en macizo facial. Estas áreas corresponden, generalmente, a glándulas salivares y extremo anterior de mucosa nasal y se mantienen durante las primeras 48 horas y no son observadas generalmente a las 72 horas. Pero con menor frecuencia se presentan otras qu...

  17. First record of a Late Holocene fauna associated with an ephemeral fluvial sequence in La Pampa Province, Argentina. Taphonomy and paleoenvironment

    Science.gov (United States)

    Montalvo, Claudia I.; Fernández, Fernando J.; Bargo, M. Susana; Tomassini, Rodrigo L.; Mehl, Adriana

    2017-07-01

    The first Late Holocene mammal assemblage (mainly micromammals) of La Pampa Province was found in Quehué paleontological site, associated with an ephemeral fluvial sequence. Taphonomical features of the collected materials were evaluated in order to increase the knowledge of the ancient vertebrate communities of this area and to interpret the origin of the assemblages. Field data and taphonomic analysis of the specimens, suggested the recognition of three assemblages with different taphonomic histories: 1) large to medium sized mammals; 2) micromammals found inside burrows or associated with them; and 3) discrete accumulations of micromammals and other microvertebrates (amphibians, reptiles and birds). Additionally, the paleoenvironmental analysis based mainly on the record of small mammals reflected the predominance of semi-arid conditions associated with a mosaic of open shrub steppe, grasslands and xerophytic forests of Espinal, similar to the present one in the Quehué valley area. However, the presence of Lestodelphys halli in the Quehué site during the Late Holocene (∼1.2 ky BP), suggests a more heterogeneous environment and perhaps relative colder and drier than current times, which are featured by more mesic conditions and anthropic activities, mainly agriculture and livestock during the last centuries.

  18. Infection with a Hepatozoon sp. closely related to Hepatozoon felis in a wild Pampas gray fox (Lycalopex -Pseudalopex -gymnocercus) co-infected with canine distemper virus.

    Science.gov (United States)

    Giannitti, Federico; Diab, Santiago S; Uzal, Francisco A; Fresneda, Karina; Rossi, Daniel; Talmi-Frank, Dalit; Baneth, Gad

    2012-05-25

    A species of Hepatozoon closely related to Hepatozoon felis found in the skeletal and cardiac muscle of a wild Pampas gray fox (Lycalopex gymnocercus) is described. The fox was euthanized after showing severe incoordination. On necropsy and histopathology there was bilateral, diffuse, severe, sub-acute, necrotizing bronchointerstitial pneumonia, with intracytoplasmic and intranuclear eosinophilic inclusion bodies. Canine distemper virus was detected by immunohistochemistry in the bronchiolar epithelium, syncytial cells, alveolar macrophages and pneumocytes. The skeletal muscle and myocardium contained multiple round to oval protozoan cysts ranging from 64 μm × 75 μm to 98 μm × 122 μm, with a central eosinophilic meront-like core surrounded by concentric rings of mucinous material resembling Hepatozoon americanum cysts but smaller in size. Macrophages within rare pyogranulomas and monocytes/macrophages in adjacent sinusoidal blood vessels in the skeletal muscle contained intracytoplasmic round protozoa consistent with merozoites or developing gamonts of Hepatozoon. Hepatozoon sp. infection was confirmed by PCR of skeletal muscle and the sequenced 18S rRNA PCR product was found to be 99% identical to H. felis by BLAST analysis and deposited in GenBank as accession number HQ020489. It clustered together in the phylogenetic analysis with published H. felis sequences and separately from H. canis, H. americanum and other Hepatozoon species. However, the close relatedness of the fox Hepatozoon to H. felis does not rule out infection with a different and possibly unknown Hepatozoon species. Published by Elsevier B.V.

  19. Genetic divergence among populations and accessions of the spineless peach palm from Pampa Hermosa landrace used in the heart-of-palm agribusiness in Brazil.

    Science.gov (United States)

    Alves-Pereira, Alessandro; Clement, Charles R; Picanço-Rodrigues, Doriane

    2012-04-01

    Although originally domesticated for its fruit, exploitation of the peach palm (Bactris gasipaes Kunth) in the production of gourmet heart-of-palm has also become an important activity, hence the need for improved material for large-scale production, on employing the Pampa Hermosa landrace as the seed source. In this study 11 microsatellite markers were used to evaluate genetic divergence among 96 elite plants representing four populations of spineless peach palm from the above cited source. Genetic variability was high (H(T) = 0.82). The low levels of divergence [F(ST) (0.023), G(ST)' (0.005)] and the high number of migrants (Nm - 3.8 to 52.2) indicated significant interpopulation gene flow. Some of the plants presented high levels of genetic divergence, but the plants were grouped independently of their geographic origins. When combined with morpho-agronomic evaluation, the results found could substantially contribute towards mounting an efficient tool for obtaining superior genotypes with wide genetic variability for improvement programs.

  20. Genetic divergence among populations and accessions of the spineless peach palm from Pampa Hermosa landrace used in the heart-of-palm agribusiness in Brazil

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    Alessandro Alves-Pereira

    2012-01-01

    Full Text Available Although originally domesticated for its fruit, exploitation of the peach palm (Bactris gasipaes Kunth in the production of gourmet heart-of-palm has also become an important activity, hence the need for improved material for large-scale production, on employing the Pampa Hermosa landrace as the seed source. In this study 11 microsatellite markers were used to evaluate genetic divergence among 96 elite plants representing four populations of spineless peach palm from the above cited source. Genetic variability was high (H T = 0.82. The low levels of divergence [F ST (0.023, G ST' (0.005] and the high number of migrants (Nm -3.8 to 52.2 indicated significant interpopulation gene flow. Some of the plants presented high levels of genetic divergence, but the plants were grouped independently of their geographic origins. When combined with morpho-agronomic evaluation, the results found could substantially contribute towards mounting an efficient tool for obtaining superior genotypes with wide genetic variability for improvement programs.

  1. Observations on the macroscopic anatomy of the intestinal tract and its mesenteric folds in the pampas deer (Ozotoceros bezoarticus, Linnaeus 1758).

    Science.gov (United States)

    Pérez, W; Clauss, M; Ungerfeld, R

    2008-08-01

    We described the macroscopic anatomy of the intestines and their peritoneal folds of five adult pampas deer (Ozotoceros bezoarticus), a cervid species considered to ingest a high proportion of grass in its natural diet. The mean (+/-SD) body weight was 17 (+/-2) kg. The small intestine and the caecocolon measured 495 (+/-37) cm and 237 (+/-24) cm in length, respectively, with an average ratio (small intestine:caecocolon) of 1.9 (+/-0.1). The ascending colon had two and a half centripetal gyri, a central flexure and two centrifugal gyri. The spiral ansa, which was similar to an ellipse, was fixed to the whole left face of the mesenterium. Apart from the peritoneal folds described in the Nomina Anatomica Veterinaria, three additional, hitherto not described folds were found: a fold that fixed the caecum to the proximal ansa of the ascending colon, one that joined the terminal part of the proximal ansa to the last centrifugal gyrus of the spiral ansa of the ascending colon, and one that linked the ascending duodenum to the proximal ansa of the ascending colon. When compared with published data from other cervids of different feeding niches, it appears that, among cervids, the ratio of small intestine to the caecocolon length does not reflect the natural diet.

  2. Hf isotope study of Palaeozoic metaigneous rocks of La pampa province and implications for the occurrence of juvenile early Neoproterozoic (Tonian) magmatism in south-central Argentina

    Science.gov (United States)

    Chernicoff, C. J.; Zappettini, E. O.; Santos, J. O. S.; Belousova, E.; McNaughton, N. J.

    2011-12-01

    On a global scale, juvenile Tonian (Early Neoproterozoic) magmatic rocks are associated with the extensional events that lead to the breakup of the Rodinia supercontinent. In Argentina, no geological record is available for this time interval, lasting from 1000 to 850 Ma. We present indirect evidence for the existence of Tonian extension in Argentina, as supported by Hf and Nd isotope determinations on Phanerozoic magmatic and sedimentary rocks. We mainly focus on our own Hf isotope determinations carried out on U-Pb SHRIMP dated zircons from Palaeozoic metaigneous rocks of La Pampa province, south-central Argentina, i.e. metagabbros of Valle Daza, dioritic orthogneiss of Estancia Lote 8, and metadiorite of Estancia El Carancho, having found that these rocks were derived from sources of ca. 920 to ca 880 Ma, with ɛHf values between +6.83 and + 9.59. Inherited zircons of this age and character identified in these rocks also point to the same source. We also compile additional Hf and Nd studies from previous work on Phanerozoic magmatic and sedimentary rocks. We preliminarily compare the age of the juvenile Tonian sources referred to in our work with that of two extensional events identified in the São Francisco craton, Brazil.

  3. Arqueología de las sociedades prehispánicas de la provincia de La Pampa. Manejo de recursos culturales y puesta en valor de historias regionales

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    Mónica Alejandra Berón

    2007-01-01

    Full Text Available El conocimiento científico sobre el pasado prehispánico de la provincia de La Pampa, por diferentes motivos, estuvo relegado a un segundo plano hasta hace pocos años. Revertida esta situación, hoy disponemos de un panorama amplio de su prehistoria, desde los momentos más tempranos del poblamiento de la región, hasta la co- existencia indígena con la sociedad hispanocriolla. Para llegar a este conocimiento se debe destacar el trabajo de diversos profesionales y estudiantes, pero sobre todo el trabajo pionero de Carlos Gradin. En este artículo se reseñaran los avances en las investigaciones arqueoló- gicas en el Centro- Sur pampeano. Además de la investigación básica, nuevos acercamientos en nuestra disciplina imponen el trabajo parti- cipativo con las comunidades locales, así como la decisión conjunta acerca del destino de los resultados del trabajo de investigación y de los restos materiales que constituyen parte del patrimonio arqueológi- co local.

  4. La incorporación de los territorios nacionales en el proceso de consolidación del estado argentino. El caso del territorio de la Pampa Central

    Directory of Open Access Journals (Sweden)

    Marisa Moroni

    2005-01-01

    Full Text Available En la mayoría de los escritos de la élite letrada argentina del XIX, se identificó a la civilización como una manifestación de la identidad nacional, supuesto que las llevó a legitimar su función civilizadora y a impulsar el proceso de consolidación del Estado que requería la ocupación total del territorio, aún en manos de los indígenas a los que se responsabilizaba, junto con los caudillos, del fracaso de la unificación nacional. Desde las estructuras del poder estatal, se definió a los nuevos territorios como espacios vírgenes con infinitas posibilidades y ventajas económicas para explotar. Este argumento político atrajo pobladores -nacionales y extranjeros- que ocuparon y encaminaron la organización productiva de las futuras provincias. En este trabajo se realiza una aproximación al proceso de incorporación y posterior organización institucional de las tierras fronterizas incorporadas con la "Conquista al Desierto". En particular, se analiza la estructura político-administrativa del Territorio Nacional de la Pampa Central, constituido como tal en 1884, con el establecimiento de las primeras autoridades militares destinadas a fundar poblaciones y administrarlas políticamente.

  5. Species diversity and morphometrics of tardigrades from a medium-size city in the Neotropical Region: Santa Rosa (La Pampa, Argentina

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    Peluffo, J. R.

    2007-06-01

    Full Text Available Tardigrade diversity was studied in a medium-sized city in the Neotropical Region: Santa Rosa (La Pampa, Argentina. Samples were collected between February 1999 and January 2000 from lichens and mosses growing on sidewalk trees of the urban and periurban area. Five species of tardigrades were found, i.e., Echiniscus rufoviridis du Bois-Reymond Marcus, 1944, Macrobiotus areolatus Murray, 1907, Ramazzottius oberhaeuseri (Doyère, 1840, Milnesium cf. tardigradum and a non-described species of Macrobiotus. Only one species, M. cf. tardigradum, was found in areas with high levels of vehicle traffic. Results are compared with those from cities in the Nearctic and Palearctic regions. Measurements and pt index values (percentage ratios between the length of the structure considered and the buccal tube length are provided for M. areolatus, R. oberhaeuseri and M. cf. tardigradum. Amongst the characters considered, the pt index for the stylet support insertion shows the least intraspecific variation. This character is also independent from body length and buccal-tube length.

  6. Identidad y fantasma: situando las nuevas prácticas de libertad del movimiento indígena en La Pampa

    Directory of Open Access Journals (Sweden)

    Axel Lazzari

    2007-01-01

    Full Text Available En este artículo sostengo que el actual reconocimiento de los Rankülche reproduce, en el nuevo marco de una identidad provincial pluralista, patrones de (invisibilización análogos a los que en el pa- sado determinaron el desvanecimiento de esta identidad y, por ende, grupo indígena. Esta (invisibilización también alcanza a las propias estrategias de identidad de los Rankülche pero, sin embargo, éstas señalan prácticas intersticiales de libertad que intentan reapropiar con fi- nes diferentes los modos oficiales del reconocimiento pluralista. Estos problemas son investigados en el dispositivo de Desvanecimiento del Ranquel , que se inicia a fines del siglo XIX, y el dispositivo de Retorno del Rankülche que aparece en los años noventa. El objetivo general es doble. Por una parte, detectar los “fantasmas” que ayer minaban la inscripción del Ranquel como identidad aborigen en proceso de des- aparición y que hoy socavan la representación del Rankülche como identidad que retorna. Por la otra, se trata de identificar cómo dichas fallas representacionales anuncian el espacio donde hoy se desenvuel- ven prácticas de libertad que hacen al proyecto de autonomía cultural y política de los indígenas en La Pampa.

  7. A presença de tireoidite linfocitária crônica influencia o estadiamento tumoral do carcinoma diferenciado da tireoide? Does chronic lymphocytic thyroiditis influence the staging of differentiated thyroid carcinoma?

    Directory of Open Access Journals (Sweden)

    Marcos Antonio Nemetz

    2011-02-01

    Full Text Available A associação entre carcinoma diferenciado de tireoide (CDT e tireoidite linfocitária crônica (TLC tem sido relatada na literatura. OBJETIVO: Avaliar a incidência desta associação e determinar se a TLC pode influenciar no estadiamento tumoral do CDT quando associada a outras variáveis de risco. FORMA DE ESTUDO: Coorte histórica (retrospectiva. MATERIAL E MÉTODO: Avaliaram-se 52 prontuários e laudos de pacientes portadores de CDT, no período de 1999 a 2009, divididos em dois grupos. O primeiro, composto de 35 pacientes portadores de CDT sem TLC; o segundo, com 17 pacientes, associado à TLC. O tratamento instituído para todos os pacientes foi a tireoidectomia total. Variáveis comuns a ambos os grupos como idade, gênero, padrão histológico, diâmetro tumoral, metástase locorregional e à distância, invasão extratireoidiana, multifocalidade e presença de cápsula tumoral foram comparadas. Aplicou-se os testes t-Student e Qui-quadrado para análise dos dados. RESULTADOS: A incidência de CDT isolado foi maior do que a de CDT+TLC (p=0,0126. Nenhuma diferença estatística quanto às variáveis comuns analisadas foi observada. CONCLUSÕES: A presença de TLC ocorreu em 33% dos pacientes com CDT. Todos os casos de CDT eram em estádios iniciais.The association between differentiated thyroid carcinoma (DTC and chronic lymphocytic thyroiditis (CLT has been reported in literature. AIM: To evaluate the incidence of this association and to determine whether the CLT may influence on the early initial staging of DTC when associated with other variable risks. STUDY DESIGN: Historical (retrospective cohort. MATERIALS AND METHODS: Fifty two patients with DTC were evaluated from 1999 to 2009. They were divided into two groups. The first group had 35 patients with DTC without DLT; the second had 17 patients with CLT. Total thyroidectomy was the treatment chosen for all patients. Similarities shared in both groups such as age, gender

  8. Diversidade de anfíbios anuros de uma área de Pampa no município de São Gabriel, Rio Grande do Sul, Brasil

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    Ana Maria R. Bolzan

    2014-09-01

    Full Text Available Considerado um bioma ameaçado, o Pampa possui um dos menores percentuais de área legalmente protegida. Além disso, o conhecimento sobre comunidades de anuros neste bioma ainda é escasso. Nesse contexto, o objetivo deste estudo foi determinar a composição de anuros em uma área de Pampa no sul do Brasil. Entre janeiro de 2009 e fevereiro de 2010 foi realizado um inventário na Fundação Estadual de Pesquisa Agropecuária do município de São Gabriel, Rio Grande do Sul. A procura dos exemplares foi realizada em poças permanentes, semi-permanentes e temporárias pelo método de levantamento em sítio de reprodução. Foram registradas 21 espécies pertencentes a cinco famílias, o que corresponde a aproximadamente 20% das espécies do estado e 42% das espécies conhecidas para a ecorregião Savana Uruguaia. Dez espécies foram consideradas frequentes, sete comuns e quatro foram raras. Foram registrados três modos reprodutivos, sendo que 57% das espécies utilizam o modo 1, que parece estar relacionado à homogeneidade da área. A análise de agrupamento comparando a composição de anuros de quatro localidades distintas mostrou maior similaridade com o município de Candiota (região da Campanha. As espécies presentes na área de estudo são associadas a formações campestres do estado e países vizinhos e podem ser consideradas típicas do bioma Pampa.

  9. Recuperación y cierre de áreas degradadas por residuos sólidos en las Pampas de Reque: estudio de impacto ambiental - distrito de Reque, Lambayeque 2011

    OpenAIRE

    Mejía Sánchez, Segundo Néstor

    2012-01-01

    El presente Estudio de investigación, consistió en revisar la normatividad referente a la formulación de Estudios de Impacto Ambiental del proyectos de cierre y recuperación de áreas degradadas por contaminación de residuos sólidos; para proponer el Estudio de Impacto Ambiental (EIA) del proyecto de inversión Pública denominado "Recuperación y Cierre de Áreas Degradadas por Residuos Sólidos en las Pampas de Reque", formulado a nivel de perfil, en su fase de pre inversión. El problema de la pr...

  10. Programa de Habilidades Sociale, Basado en la Teoría de Clima Institucional de Rensis Likert , para Fortalecer la Gestión en la Institución Educativa N° 11504 de Pampa Grande Chongoyape - 2015

    OpenAIRE

    Acosta Vásquez, Alci; Alvines Vilchez, José Armando

    2017-01-01

    l desarrollo de la investigación PROGRAMA DE HABILIDADES SOCIALES, BASADO EN LA TEORÍA DE CLIMA INSTITUCIONAL DE RENSIS LIKERT, PARA FORTALECER LA GESTIÓN EN LA INSTITUCIÓN EDUCATIVA N° 11504 DE PAMPA GRANDE-CHONGOYAPE. 2015, acorde con el diseño es descriptiva-propositiva. Efectuado el proceso de investigación se pudo determinar entre los docentes de la Institución antes citada, aún falta por desarrollar las habilidades sociales de Asertividad, Resolución de Problemas y Comunicación. Asim...

  11. Asimetría en el postcráneo de poblaciones humanas prehispánicas de Pampa y Patagonia

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    Béguelin, Marien

    2007-01-01

    Full Text Available En este trabajo se evaluó el patrón de asimetría bilateral de muestras esqueletales de poblaciones cazadoras-recolectoras de Pampa y Patagonia (n=161 en el marco de una investigación centrada en la variación geográfica de la morfología postcraneal. Se analizaron tanto la presencia como el grado de asimetría observado en los huesos largos de los miembros superiores e inferiores (húmero, radio, fémur, tibia. Se examinó también el dimorfismo sexual y la variación interpoblacional. Los análisis se basaron en los porcentajes direccional y absoluto de asimetría. El primero de ellos considera tanto la magnitud de la asimetría como la lateralidad en tanto el segundo se concentra en la magnitud. Se encontró un patrón general de asimetría en todas las muestras, siendo más marcado en los miembros superiores que en los inferiores, y hacia el lado derecho. Los miembros inferiores evidencian una asimetría muy leve, y el fémur mostró una tendencia hacia la izquierda en todas sus dimensiones (fenómeno conocido como asimetría cruzada. Las asimetrías de longitud son mucho menos pronunciadas que las de diámetros de diáfisis. En todas las muestras los grupos masculinos presentan un grado mayor de asimetría que los femeninos. Se discutirán alternativas en torno a la influencia de distintos factores, a saber sexo, tipo de medida (longitud o diámetro y diferencias interpoblacionales sobre el tipo y grado de asimetría.

  12. Energy use in cropping systems: A regional long-term exploratory analysis of energy allocation and efficiency in the Inland Pampa (Argentina)

    International Nuclear Information System (INIS)

    Ferraro, Diego Omar

    2012-01-01

    As agricultural system comprises natural processes that are ruled by thermodynamics, the energy utilization is well suited for assessing the sustainability in the management of natural resources. The goals of this paper are 1) to assess the energy use efficiency of the main crops during the 1992–2005 period in Inland Pampa (Argentina); 2) to evaluate the database structure in terms of energy allocation; 3) to assess the changes in technical efficiency using frontier analysis and 4) to identify the best explanatory variables for energy efficiency variability. Results showed an upward trend in productivity per unit area in the crops analyzed (excluding sunflower). Summer soybean and sunflower showed higher energy efficiency values by the end of time series. The main shift in the energy use pattern was the reduction of the energy allocated to tillage. The overall performance of the wheat and soybean crops in the study area appears to be closer to the energy usage pattern shown by the top 5% energy use efficiency crop fields. The exploratory analysis using classification and regression trees (CART) revealed that the energy allocation to tillage; and the crop specie were the attributes that mainly explained the energy efficiency changes. -- Highlights: ► Energy use efficiency (EUE) of main Pampean crops (Argentina) in the 1992–2005 period was analyzed. ► An upward trend in productivity per unit area was observed with the exception of sunflower crop. ► Summer soybean and sunflower showed higher energetic efficiencies by the end of the time series analyzed. ► Average wheat and soybean EUE were closer to the energy usage pattern of the top 5% EUE crop fields. ► Tillage energy and crop specie were the attributes that most strongly explain the EUE changes.

  13. Campylobacter spp.: prevalencia y caracterización feno-genotípica de aislamientos de pacientes con diarrea y de sus mascotas en la provincia de La Pampa, Argentina Campylobacter spp.: prevalence and pheno-genotypic characterization of isolates recovered from patients suffering from diarrhea and their pets in La Pampa Province, Argentina

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    Ana L Tamborini

    2012-12-01

    Full Text Available Se investigó la prevalencia de Campylobacter spp. en 327 pacientes con diarrea y en 36 animales (perros, gatos y pollos que convivían con pacientes en los que se detectó este patógeno; el estudio se llevó a cabo en Santa Rosa, La Pampa, Argentina. Se aisló Campylobacter spp. en 50/327 pacientes y en 12/36 animales, Campylobacter jejuni fue la especie más frecuente. Se detectó resistencia a ciprofoxacina (65 % y a tetraciclina (32 % en una selección de 35 aislamientos de origen humano. En el análisis por electroforesis de campo pulsado de 13 aislamientos de C. jejuni se identificaron siete subtipos genéticos. Dos subtipos agruparon aislamientos de pacientes y de sus respectivos perros, y un tercer subtipo agrupó 1 aislamiento humano y 2 de pollos de ese paciente. Si bien las aves son reconocidas como el principal reservorio, es importante fortalecer la vigilancia de Campylobacter spp. en mascotas, las cuales pueden ser portadores asintomáticos del patógeno.The prevalence of Campylobacter spp. was investigated in 327 patients suffering from diarrhea and in 36 animals (dogs, cats and chickens owned by the patients that presented infection by Campylobacter in Santa Rosa, La Pampa, Argentina. Campylobacter spp. was isolated in 50/327 patients and in 12/36 animals, being Campylobacter jejuni the most common species. Resistance to ciprofoxacin (65 % and tetracycline (32 % was found among 35 isolates of human origin studied. Seven genetic subtypes were observed among 13 C. jejuni isolates by pulsed feld gel electrophoresis. Two subtypes grouped isolates belonging to patients and their respective dogs whereas another subtype grouped one isolate of human origin and two isolates from the patient´s chickens. The results of this investigation highlight the need to strengthen surveillance of Campylobacter spp. not only in poultry, which is recognized as the main reservoir, but also in pets, which were shown to be asymptomatic carriers of the

  14. Differentiated thyroid cancer: reclassification of the risk of recurrence based on the response to initial treatment; Carcinoma diferenciado de tiroides: reclasificación del riesgo de recurrencia según la respuesta al tratamiento inicial

    Energy Technology Data Exchange (ETDEWEB)

    Martínez, M. P.; Lozano Bullrich, M. P.; Rey, M.; Ridruejo, M. C.; Bomarito, M. J.; Claus Hermberg, H.; Pozzo, M.J., E-mail: mpazmartinez@yahoo.com [Hospital Alemán, Servicio de Endocrinología, Buenos Aires (Argentina)

    2014-07-01

    response was observed in 11 (84.6 %) and an acceptable response was observed in 2 (15.4 %) of the intermediate-risk classified patients and in the high-risk group 1 patient (100 %) presented an acceptable response. Clinical status of patients after 2 years of IT: 25 (80.6 %) with no evidence of disease (NED), 6 (19.4 %) with biochemical persistence (BP) and 0 (0 %) with structural persistence (EP), recurrence (R) or death (D). After a mean long-term follow-up period of 51.3 months, the clinical status was: 25 (80.6 %) with NED, 4 (12.9 %) with BP and (0 %) with EP, R or D; for the remaining 2 (6.5 %) no long-term follow-up data was available (ND). At the end of the long-term follow-up period, 24 (96 %) patients with excellent response after 2 years of IT remained NED, whereas 1 (4 %) was reported as ND and 1 (16.7 %) patient with acceptable response after 2 years of IT remained NED (initially this was a low-risk patient), 4 (66.6 %) remained BP, 1 (16.7 %) was reported as ND and no EP, R or D was observed. Conclusions: 1) reclassification of patients was particularly useful in the intermediate risk group because 84.6 % of these patients had an excellent response after two years of IT, 2) reclassification of patients based on the response to IT, allows us to optimize their follow-up and 3) although the mean long-term follow-up period was 51.3 months, there was a good correlation between clinical status after two years of IT and after the long-term follow-up period, mainly in the excellent response group. (authors) [Spanish] Introducción: la clasificación de la American Thyroid Association (ATA) para carcinoma diferenciado de tiroides (CDT) aporta una visión estática del paciente al inicio y no está diseñada para ser modificada. El Memorial Sloan-Kettering Cancer Center (MS-KCC) diseñó una reclasificación a 2 años del tratamiento inicial (TI), permitiendo tener una óptica más dinámica. Objetivo: comunicar nuestra experiencia con la reclasificación del riesgo de

  15. Evaluation of a treatment system wastewater prebeneficiado of coffee (Coffea arabica implemented in the community Carmen Pampa province of Nor Yungas of La Paz Department

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    Álvarez Javier

    2011-08-01

    Full Text Available This research was conducted in prebeneficiadora coffee plant of UAC-CP, located in the community of Carmen Pampa, Coroico Municipality, Nor Yungas of La Paz department. The objective was to determine the efficiency of wastewater treatment prebeneficiado coffee because it is not known to be effective in reducing the level of contamination of treated wastewater, and according to the results to correct and / or validate directly model system in place. For their study was established seven sampling points within the system of treatment and four replications were made at different times and with different amounts of coffee cherry. We evaluated the parameters of temperature, pH, settleable solids, total suspended solids, fixed and volatile, biochemical oxygen demand, chemical oxygen demand and dissolved oxygen. The temperature of wastewater entering the system has recorded 16.5 o C, increasing during the treatment process at 17.5 °C and record the output is 16.5 ºC. The pH increased from 4.51 to 6.04 which occurred at the last two gaps oxygenation and not in the neutralization tank. Settleable solids (SS increased from 0.1 mg / L to 0.15 mg / L, which was recorded at the lakes of oxygen, is attributed to the drag of fine gravel. Total suspended solids (TSS have been reduced from 1927.5 mg / L to 299 mg / L gradually throughout the treatment process. Fixed suspended solids (SSF were reduced from 137.5 mg / L to 58.5 mg / L. Volatile suspended solids (VSS were reduced from 1790 mg / L to 240.5 mg / L. Biochemical oxygen demand (BOD was reduced from 6102.5 mg O2 / L to 1245 mg O2 / L. The chemical oxygen demand (COD was reduced from 9800 mg O2 / L to 1658.75 mg O2 / L. Dissolved oxygen (DO increased from 0 to 2.4 mg O2 / L, in the last two gaps in oxygenation, due to the reduction of solids and chemical oxygen demand and biochemical oxygen. Of the nine parameters measured, six meet the maximum permissible values for download in source receptor (stream

  16. The drosophilid fauna (Diptera, Drosophilidae of the transition between the Pampa and Atlantic Forest Biomes in the state of Rio Grande do Sul, southern Brazil: first records

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    Cleverton J.C. Hochmüller

    2010-01-01

    Full Text Available Although studies on drosophilid (Diptera, Drosophilidae assemblages have become relatively abundant in the past decades, many environments remain to be searched. The present study investigates the composition, the species abundances and the richness of the drosophilid assemblages in two localities of the municipality of Cruz Alta, northwestern region of the state of Rio Grande do Sul, a point of contact between the biomes Atlantic Forest and Pampa: (i an urban area (2007, constituted by a domestic orchard with Citrus trees, and (ii a forested area, in Centro de Educação, Pesquisa e Proteção Ambiental - CEPPA (2008/2009, of Universidade de Cruz Alta, located in a fragment of riparian forest. Collections were conducted using fermented banana-baited traps and repeated periodically. A total of 7,428 individuals were caught, belonging to two subfamilies, six genera and 53 species. In the urban area, 22 species were found, from two genera (N = 2,421, while in the forested area 46 species were found, from six genera (N = 5,007. Six exotic species were found, markedly more abundant in the urban area, where they corresponded to 95% of the specimens, in comparison to 50% in the forest. Between the Neotropical species, the most common were Drosophila maculifrons Duda and D. polymorpha Dobzhansky & Pavan. Only D. simulans Sturtevant was captured in all samples in both localities. The present survey represents the first records for the state of Rio Grande do Sul of the D. canalinea and D. virilis species groups and the species D. arassari Cunha & Frota-Pessoa, D. fuscolineata Duda, D. nigricruria Patterson & Mainland, D. papei Bächli & Vilela, D. senei Vilela, D. trifilum Frota-Pessoa, D. virilis Sturtevant, Leucophenga maculosa (Coquillett and Rhinoleucophenga obesa (Loew. Furthermore, it also represents the first record for the state of the genera Amiota Loew, Leucophenga Mik and Rhinoleucophenga Hendel and of the subfamily Steganinae. So, the present

  17. Rhipicephalus (Boophilus microplus (Acari: Ixodidae as a parasite of pampas deer (Ozoctoceros bezoarticus and cattle in Brazil's Central Pantanal Rhipicephalus (Boophilus microplus como parasita de veado-campeiro (Ozoctoceros bezoarticus e do gado bovino no Pantanal Central do Brasil

    Directory of Open Access Journals (Sweden)

    Paulo Henrique Duarte Cançado

    2009-03-01

    Full Text Available In the Pantanal, domestic and wild animals share the same habitats; their parasites and environment interact in a complex and dynamic way. The Rhipicephalus (Boophilus microplus is the most important cattle tick in Brazil. In the past two decades, some traditional management practices are being replaced with the aim of intensifying cattle production. Forested areas are being replaced by exotic pasture and ranch owners are replacing Nelore for European breeds. The pampas deer (Ozoctoceros bezoarticus is a medium-sized cervid that occurs in grasslands of South America. Between December 2005 and January 2007, we captured and collected ticks from 15 pampas deer and 172 bovines. The abundance, intensity, and prevalence of ticks found in cattle were lower than those in pampas deer (p No Pantanal Brasileiro, onde animais domésticos e selvagens compartilham os mesmos habitats; hospedeiros, parasitas e ambientes encontram-se em interação complexa e dinâmica. Rhipicephalus (Boophilus microplus é o carrapato bovino mais importante no Brasil. Nas últimas duas décadas práticas de manejo vem sendo substituídas com objetivo de aumentar a produtividade. Áreas de florestas estão sendo substituídas por pastagens exóticas e os produtores começam a utilizar raças européias no lugar do Nelore. O veado-campeiro é um cervídeo que ocorre em áreas de campo na América do sul. Entre dezembro de 2005 e janeiro de 2007, foram coletados carrapatos de 20 veados-campeiros e 172 bovinos. Os valores de abundância, intensidade parasitária e prevalência de carrapatos no gado foram menores que os valores encontrados no veado-campeiro (p < 0,05, indicando que o veado-campeiro é mais susceptível que o bovino. O elevado número de fêmeas ingurgitadas coletadas, sua capacidade de ovipor e o percentual de eclosão indicam que a população veado-campeiro na região de estudo é suficiente para manter o R. (B. microplus, desta maneira participando na

  18. Caracterização da estrutura da vegetação numa pastagem natural do Bioma Pampa submetida a diferentes estratégias de manejo da oferta de forragem Structural characterization of a natural pasture vegetation from Pampa Biome under different herbage allowance management strategies

    Directory of Open Access Journals (Sweden)

    Fabio Pereira Neves

    2009-09-01

    Full Text Available Os objetivos neste trabalho foram descrever e investigar a dinâmica espaço-temporal de sítios alimentares em diferentes faixas de massa de forragem e altura do pasto, assim como o percentual de área efetivamente pastejada, a taxa de acúmulo de forragem e a produção de matéria seca de uma pastagem natural do Bioma Pampa. O delineamento utilizado foi o de blocos ao acaso com duas repetições, com três ofertas de forragem fixas (8, 12 e 16% e três ofertas de forragem variáveis ao longo do ano (8-12%, 12-8% e 16-12%, com o primeiro valor correspondendo à primavera. Na oferta fixa de forragem de 8%, observou-se maior percentual de área efetivamente pastejada, porém os valores médios de altura e massa de forragem foram inferiores aos das demais ofertas. As maiores ofertas de forragem, 16 e 16-12%, apresentaram altura média do pasto superior, 9,0 cm e massa de forragem de 2.000 kg/ha de matéria seca, porém, com área efetivamente pastejada inferior às observadas nas ofertas de 8 e 8-12%. Mesmo estratégias de manejo tão distintas, aproximadamente 60 a 70% dos sítios alimentares ocorreram em faixas consideradas limitantes ao potencial de ingestão de forragem por bovinos, com exceção dos tratamentos 16% e 16-12%, nos quais se observou menor frequência de sítios alimentares na faixa inferior a 6,0 cm de altura. Os sítios alimentares, em geral, se concentraram em faixas com altura The objective of this trial was to investigate the spatio-temporal dynamics of feeding sites stratified by strips of herbage mass and sward height, and the percentage of effectively grazed area, herbage growth rate and dry matter yield of a natural pasture from Pampa Biome managed with different herbage allowance management strategies. A randomized block design with two replications was used with three fixed herbage allowance (8, 12 and 16% and three herbage allowance variables throughout the year (8-12%, 12-8%, and 16-12%, with first value

  19. Organismos edáficos como bioindicadores da recuperação de solos degradados por arenização no Bioma Pampa Edaphic organisms as bioindicators of restoration of degraded soils by arenização on the Bioma Pampa

    Directory of Open Access Journals (Sweden)

    Ana Paula Moreira Rovedder

    2009-07-01

    Full Text Available Os organismos edáficos, por sua sensibilidade a alterações no meio, têm sido utilizados como indicadores de modificações nos níveis de qualidade do solo, as quais podem ser promovidas por degradação ou agradação. Em Alegrete, Rio Grande do Sul, foram caracterizadas populações de organismos edáficos como bioindicadores dos efeitos da degradação por arenização e da recuperação por revegetação com Lupinus albescens Hook. & Arn., fabácea natural do Bioma Pampa. Os tratamentos constituíram-se de solo com cobertura natural de Lupinus albescens (TN, área arenizada que recebeu revegetação com Lupinus albescens há um ano (T1, área arenizada que recebeu revegetação com Lupinus albescens há três anos (T3, solo arenizado (SA e campo nativo (CN. As coletas foram feitas em fevereiro e maio de 2006, com armadilhas PROVID. Foram determinados os parâmetros: abundância de organismos em nível de Ordem, riqueza de organismos e índices de diversidade e igualdade de Shannon. A arenização reduziu o desenvolvimento das populações edáficas, enquanto a estratégia de revegetação mostrou efeitos positivos na recolonização da área. O grupo Collembola destacou-se como bioindicador dos efeitos dos processos de degradação e recuperação. O índice de diversidade de Shannon não foi adequado para a avaliação dos efeitos da arenização quando analisado isoladamente.Edaphic organisms are sensible to environment alterations and have been used as indicators of soil quality changes. These modifications can be promoted by degradation or agradation events. The study area is located in Alegrete, Rio Grande do Sul. It was analyzed the role of epigeic soil fauna as bioindicator of soil degradation by arenização and its restoration by revegetation with Lupinus albescens Hook. & Arn., a native fabaceous of Bioma Pampa. The treatments were constituted of soil under natural covering with Lupinus albescens, degraded area recovered with

  20. Detección de anticuerpos anti-Brucella spp. en cerdos mediante técnicas de aglutinación y ELISA indirecto en las provincias de Buenos Aires y La Pampa: Argentina Detection of anti-Brucella spp. antibodies in swine by agglutination techniques and indirect ELISA in the Buenos Aires and La Pampa provinces: Argentina

    Directory of Open Access Journals (Sweden)

    H.A. Castro

    2006-04-01

    Full Text Available En nuestro país no existe un programa de control sobre brucelosis porcina y su verdadera situación epidemiológica es desconocida. El objetivo de nuestro trabajo fue detectar la presencia de anticuerpos anti-Brucella spp. en porcinos provenientes de criaderos del sudoeste de la provincia de Buenos Aires y del este de la provincia de La Pampa. La toma de muestras de sangre se realizó en el momento del faenado de los animales. La detección de anticuerpos se efectuó mediante las técnicas de aglutinación con antígeno tamponado en placa (BPA, seroaglutinación en tubo (SAT, aglutinación con 2-ME (2-ME y ELISA indirecto, con dos antígenos diferentes: el antígeno CYT (fracción citoplasmática de B. abortus S19 y el antígeno CP (extracto citoplasmático libre de lipopolisacárido. Del total de las muestras analizadas (n=325, el 17,8% fue positivo para BPA, el 13,8% fue positivo para SAT y sólo el 8,0% fue positivo para 2-ME. Mediante ELISA-CYT, este porcentaje se elevó a 21,0%, mientras que a través del ELISA-CP sólo se halló un 10,0% de muestras reactivas. Estos resultados son compatibles con los informados en los escasos reportes previos para todo el país y sugieren la necesidad de extender los estudios a otras zonas, donde sea habitual la cría de cerdos.Porcine brucellosis is one of the most important zoonoses in this country. Currently, there is no control program for porcine brucellosis in Argentina and the epidemiological situation is still unknown. The purpose of our study was to detect anti-Brucella spp. antibodies in swine in the southwest of the Buenos Aires province and the east of the La Pampa province. Blood samples were obtained when animals were slaughtered. The presence of anti-brucella antibodies was studied by the buffered plate agglutination test (BPA, the tube agglutination test (SAT, the 2-mercaptoethanol (2-ME agglutination test and indirect ELISA tests, using the cytosolic fraction from Brucella abortus S19

  1. Thickness of the oligo-neogene sedimentary cover in the Central Depression, northern Chile (Pampa del Tamarugal, 20°45'-21°30'S), based on seismic reflection

    Science.gov (United States)

    Garcia, M.; Simicic, Y.; Contreras Reyes, E.; Charrier, R.

    2013-12-01

    The estimation of the Pampa de Tamarugal oligo-neogene sedimentary cover thickness from seismic interpretation is crucial for scientific and applied subjects, such as placing aquifers traps and Mesozoic-Paleogene basement top location for mining exploration drilling. The Chilean National Petroleum Company (ENAP) has explored hydrocarbon resources in the area, raising several reflection seismic lines and drilling some wells. Previous studies used the paper seismic data by determining the cover geometry and defining the basement-cover boundary. We have obtained directly SGY digital files, which allow a better definition and modeling of stratigraphy and cover thickness. This thickness was estimated by the travel time in the seismic reflection lines and the value of the p-wave propagation velocity (0.91 to 1.97 km/s for cover). The last value was obtained by density measurements of field samples, which resulted from 1,895 to 2,065 g/cm3. In the central-south part of the Pampa del Tamarugal, immediately south of Cerro Challacollo, the west-east-oriented 99_7 seismic line shows a 'basement high' whose top is at 100 m from the surface. The basement was uplift by a north-trend west-verging reverse fault and separates two sub-basins of 9.5 km and 13.8 km wide, and maximum cover thicknesses of 600 and 850 m, west and east respectively. To the north of Cerro Challacollo, the subparallel 99_6 line shows a similar geometry, and increasing the depth of the basement high top up to 350 m in the central part of the section. For seismic lines south of Cerro Challacollo, the basement high disappears and the cover thickness increases. To improve the accuracy of the cover thickness estimations, we will test directly measurements of p-wave propagation velocity in field samples of basement and cover (instead of approximations from the density measurements).

  2. Climate-vegetation relationship: adaptations of jarillal community to the semiarid climate. Lihué Calel National Park, province of La Pampa, Argentina

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    Valeria Soledad Duval

    2015-12-01

    Full Text Available The study of vegetation from the Geography perspective focuses on the analysis of the spatial distribution and on the factors affecting it. One of these factors is the climate, which determines the characteristics of the vegetation and, on a larger scale, of the communities. The aim of this paper is to analyze the climate-vegetation relationship by studying adaptations of the jarillal community regarding the semiarid climate in the Lihué Calel National Park, Argentina. Therefore, this contribution is concerned with the knowledge of the characteristics of the environment in order to understand how vegetation responds to certain phenomena, so management of protected areas will be more suitable. Lihué Calel National Park is a national protected area located in the south-center of La Pampa province, Argentina. According to Cabrera (1976 the area belongs to the floristic province of “monte” and the climate is warm and dry. In the interest to achieve the goals of this paper, Thornthwaite and Mather´s water balance was done. The data was collected from a weather station that belongs to the national park, for the period 1995-2010. Emberger›s pluviothermic coefficient, Lang´s rainfall index, De Martonne´s aridity index and Currey´s continentality index were analyzed. In addition, ten stands or plots of vegetation were placed to determine the floristic composition and the vegetation physiognomy. Then, plants species were identified as individuals and their adaptive responses were also analyzed. In conclusion, the survey verified that semi-arid climate conditions determine the morphology and the appearance of jarillal. Climate analysis shows that for the period 1995-2010 the average annual temperature is 16.2° C and reveals that thermal summers and winters are well differentiated. Large water deficit is defined, because water balance indicates that the evapotranspiration exceeds precipitation during every month of the year. According to

  3. Descubrimiento de una tumba en el sitio lítico de la pampa de los fósiles, zona de Cupísnique y sus aplicaciones

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    1974-01-01

    Full Text Available II est rendu compte de la découverte d'une tombe d’enfant dans l'atelier Nº 4 du site PV22-12, Pampa de los Fósiles. Cette tombe était recouverte par les déchets de taille de pointes du type connu sous le nom de pointe de Paiján. On peut donc la considérer comme associée à cette industrie et appartenant à la période précéramique ancienne. Le squelette fut trouvé assez détérioré, sa position restant cependant visible. Le sexe est indéterminé, l'âge, peu précis, se situe aux environs de 3 ans. Les caractéristiques du sédiment et les dimensions probables de la fosse conduisent à une évaluation de la profondeur atteinte par la déflation éolienne en cet endroit depuis l'époque de l'enterrement: environ 50 cm. Se da cuenta del hallazgo de una tumba de niño en el taller Nº 4 del sitio PV22-12, Pampa de los Fósiles. Esta tumba estaba cubierta por los desechos de talla de puntos del tipo conocido bajo el nombre de Paiján. Por lo tanto se la considera asociada a esta industria y perteneciente al período precerámico temprano. El esqueleto se encontró bastante destruido, pudiéndose sin embargo apreciar su posición. El sexo es indeterminado y la edad no muy precisa, se trata de un niño de alrededor de 3 años. Las características del sedimento y las posibles dimensiones de la fosa de entierro llevan a hacer una evaluación de la erosión eolica desde el tiempo del entierro: aproximadamente 50 cm.

  4. Population Growth of Rhopalosiphum padi L. (Homoptera: Aphididae on Different Cereal Crops from the Semiarid Pampas of Argentina under Laboratory Conditions Crecimiento Poblacional de Rhopalosiphum padi L. (Homoptera: Aphididae sobre Diferentes Cereales de la Pampas Semiárida de Argentina en Condiciones de Laboratorio

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    Lilian R Descamps

    2011-09-01

    Full Text Available The bird cherry-oat aphid Rhopalosiphum padi L. (Homoptera: Aphididae is one of the main pests in a number of crops in the semiarid Pampas of Argentina. In the present study, the effect of different host plants, including Triticum aestivum L., ×Triticosecale Wittm., Hordeum vulgare L., Hordeum distichum L., Avena sativa L., and Secale cereale L. on biological parameters of R. padi L. was studied in the laboratory at 24 ± 1 °C, 65 ± 10% RH and a 14:10 photoperiod. Longevity, intrinsic rate of natural increase (r m, net reproductive rate (R0, mean generation time (T, doubling time (DT, and finite rate of increase (λ of the bird cherry-oat aphid on the different cereal crops were estimated. Differences in fertility life table parameters of R. padi among host plants were analyzed using pseudo-values, which were produced by Jackknife re-sampling. Results indicated that beer barley might be the most suitable food for R. padi due to greater adult longevity (20.88 d, higher fecundity (41 nymphs female-1, higher intrinsic rate of natural increase (0.309 females female-1 d-1, lower doubling time (2.24, and lower nymphal mortality (22.2%. Therefore, it can be concluded from the present study that R. padi prefers beer barley for fast and healthy development over other cereal crops.El áfido Rhopalosiphum padi L. (Homoptera: Aphididae es una de las principales plagas de numerosos cultivos de la región semiárida pampeana de Argentina. En el presente trabajo se estudió el efecto de diferentes cereales incluidos Triticum aestivum L., ×Triticosecale Wittm., Hordeum vulgare L., Hordeum distichum L., Avena sativa L. and Secale cereale L. sobre los parámetros biológicos de R. padi en laboratorio. Se estimaron longevidad, tasa intrínseca de crecimiento natural (r m, tasa neta de reproducción (R0, tiempo generacional medio (T, tiempo de duplicación (TD, y tasa finita de incremento (λ del pulgón de la avena en diferentes cereales. Las diferencias de

  5. El significado del estudio y la motivación escolar de jóvenes que asisten a circuitos educativos diferenciados socioeconómicamente The meaning of the study and the school motivation of young people who belong to educational circuits socio-economically differentiated

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    Gabriela Aisenson

    2010-12-01

    Full Text Available Este artículo se centra en el análisis de las representaciones de estudio de jóvenes que asisten a circuitos educativos diferenciados socio-económicamente. Se analiza el significado del estudio, la motivación escolar, la autopercepción de competencias para el estudio, la percepción del prestigio de la escuela y los proyectos futuros. Los resultados obtenidos permiten observar la importancia que tiene el estudio para los jóvenes, como un medio para el desarrollo personal y para lograr inserciones laborales de calidad. Los jóvenes del circuito educativo más carenciado puntúan más alto en todas las dimensiones referidas a la motivación escolar, asimismo en la dimensión de desmotivación. Entre estos jóvenes predominan las altas expectativas en el estudio, que se combinan con mayores dificultades para sostenerlos. Naturalización y esfuerzo se manifiestan como las principales diferencias con respecto a las representaciones respecto del estudio entre ambos circuitos educativos.This article focuses on the representations of the study of youths who belong to educational circuits socio-economically differentiated. It analyzes the meaning of study, school motivation, self-perception of studying competence, the perception of their school's prestige and the future projects. The results obtained show the importance of the study for young people as a mean of personal development and to apply for more qualified jobs. Young people who belong to the low educational circuit get the highest scores in all the dimensions related to academic motivation, including the dimension of demotivation. Among these youths, high expectations in the study predominate, combined with major difficulties to support them. Naturalization and making effort appear to be the main differences in the representations of study between both educational circuits.

  6. Internauta brasileiro: perfil diferenciado, opiniões indiferenciadas

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    Rogerio Schlegel

    2009-10-01

    Full Text Available O artigo pretende contribuir para melhorar a compreensão das relações entre o uso da internet, de um lado, e a participação política dos cidadãos, de outro. Sua ênfase é nos fatores que determinam o uso regular da internet e no perfil do internauta em termos de participação e valores relacionados à política. A análise dos dados do survey Latinobarómetro de 2007 aponta a idade e a escolaridade como principais determinantes do uso da internet no Brasil, sendo que a ocupação e uma proxy para renda não tiveram impacto consistente na chance de conectar-se, contrastando com os casos de Argentina e Chile. Ao mesmo tempo, o público que integra a comunidade on-line mostrou maior mobilização, em termos de participação política tradicional, e pouca diferenciação em matéria de opiniões sobre política, na comparação com os não-usuários da nova tecnologia. Essas evidências sugerem que a conexão ao mundo digital tende a dar voz a segmentos que já contam com acesso privilegiado a governantes e elaboradores de políticas, sobretudo por seu capital cultural, embora haja sinais da existência de oportunidades para outros setores sociais. Também indicam que a importância do "digital divide" no país deve ser relativizada, uma vez que os internautas não apresentam opiniões com orientação claramente destoante do restante da população.

  7. Compensation programs of companies who adhered to the differentiated levels of corporate governance of the São Paulo Stock Exchange Filosofia e modelo dos programas de remuneração das empresas que aderiram aos níveis diferenciados de governança corporativa da Bovespa

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    Eduardo de Camargo Oliva

    2006-06-01

    Full Text Available The philosophy and models of the System of Compensation of administrators were analyzed to verify the degree of agreement with the good practice of corporate governance structure. The structure of corporate governance is made up of the Chairman of the Board of Directors, council members, CEO and the executive board. Literature reviewed disclosed only isolated aspects of governance and remuneration without any integrated format. Exploratory and descriptive methods were used for documentary research and field survey at the companies who had adhered to the differentiated levels of corporate governance of the São Paulo Stock Exchange (level 1, level 2 and new market. Conclusions showed that remuneration of the council member was reasonable without considering the variable component found in executive board. The organizations used short term indicators for the remuneration system and were already formalizing procedures. However, greater internal as well as external transparency is required to make these procedures more public.O objetivo deste artigo foi identificar, descrever e analisar a filosofia e os modelos do Sistema de Remuneração de administradores e verificar se estavam alinhados com as boas práticas da estrutura de Governança Corporativa. Compõem a estrutura de governança corporativa o Presidente do Conselho de Administração, os conselheiros, o Chief Executive Officer (CEO e a diretoria executiva. Na revisão da literatura constatatou-se a existência de obras que estudaram aspectos de governança e de remuneração separadamente, e não de forma conjunta e integrada. Para a realização da pesquisa¹ documental e do levantamento de campo foram utilizados os métodos exploratório e descritivo junto às empresas que aderiram aos níveis diferenciados de governança corporativa da Bovespa (nível 1, nível 2 e novo mercado. Como principais conclusões, pôde-se verificar que a remuneração do conselheiro é módica, n

  8. Diversidad y distribución de acridios (Orthoptera: Acridoidea en pastizales del sur de la región pampeana, Argentina Diversity and distribution of grasshoppers (Orthoptera: Acridoidea in grasslands of the Southern Pampas region, Argentina

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    Yanina Mariottini

    2013-03-01

    Full Text Available Los acridios son componentes nativos de los pastizales, dichos sistemas han sido modificados debido a la intensificación de las actividades agrícola-ganaderas y por lo tanto se considera importante estudiar las comunidades de acridios asociadas. Se estudió la diversidad y distribución de acridios en el Sur de la región pampeana a través de muestreos realizados en las comunidades vegetales más representativas del partido de Laprida, provincia de Buenos Aires, durante cinco temporadas (2005-2010. Se recolectaron 22 especies. La subfamilia Melanoplinae fue la más diversa (ocho especies. La mayor cantidad de especies se observó en los pastizales nativos (18. La diversidad en los pastizales alterados (1.75±0.096 fue superior (pIn Argentina, the grasslands of Pampas region comprise approximately 15% of the country. As in other grasslands of the world, grasshoppers are among the most important native herbivores. Their economic importance has been recognized in Argentina since the mid to late nineteenth century, since outbreaks of different species have become recurrent phenomena. Therefore, the main objective of this work was to study their diversity and distribution in grasslands of the Southern Pampas region (Laprida county, Buenos Aires province, as one of the most affected areas. The study was conducted during five seasons (2005-10. Sampling sites were represented by the most common plant communities in this area, classified in four categories: native grasslands, disturbed grasslands, implanted pastures and halophilous grasslands. The samplings were conducted from mid-spring to early autumn, with five or six samples per season. We estimated the following population descriptors: species richness (S, eveness (E, dominance (J, and diversity index (H´. In order to evaluate the similitude of the grasshopper communities present in the different plant communities, we used qualitative and quantitative coefficients of similitude. A total of 22

  9. Comercio y crédito agrario: Un estudio de caso sobre las prácticas y lógicas crediticias de comerciantes de campaña a comienzos del siglo XX en La Pampa

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    Andrea Lluch

    2006-06-01

    Full Text Available Durante la segunda mitad del siglo XIX y el primer tercio del XX, la expansión agraria desempeñó un papel central en la formación del capitalismo argentino. Articulando este proceso se desarrollaron una serie de mecanismos de intermediación, encargados de canalizar la producción de la campaña hacia los puertos además de proveer una serie de insumos, maquinarias, alimentos y financiación a los productores. Nuestra investigación se propuso estudiar el papel de intermediación comercial y financiera desempeñado por los comercios rurales -denominados almacenes de ramos generales- durante las tres primeras décadas del siglo XX. El área de estudio se correspondió con la franja centro-este del Territorio Nacional de La Pampa. En este artículo se presentan algunas de nuestras conclusiones alrededor de los mecanismos crediticios -directos e indirectos-, los costos, prácticas y lógicas del ejercicio habilitador de los negocios de campaña, focalizando en las tasas de interés y las políticas de racionamiento crediticio. Para avanzar en el análisis de estos temas la estrategia fue reducir la escala de observación y concentrarse en estudios de caso. A la par, el propósito de reexaminar el papel de los comerciantes se apoyó en la incorporación de los avances de la teoría económica sobre las tareas de intermediación financiera en los mercados rurales.The agrarian expansion was the motor of the economic growth of Argentina at the end of the nineteenth century. In this process, like in other contexts, the country general stores, called in Argentina "almacenes de ramos generales", played an important role, channeling part of the production toward the port and providing inputs, machinery, capital but also clothes and dry canned food for rural producers until the major yearly crops were harvested. The study about the role and modus operandi of rural merchants in the first decades of the XX century is the main topic of this article. The

  10. Eficiencia agronómica del azufre elemental relativa a una fuente azufrada soluble en trigo en la Región Pampeana Agronomic efficiency of elemental sulphur in wheat relative to a soluble sulphur source in the Pampas Region

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    Martin Torres Duggan

    2010-07-01

    siembra, ésta última con bajo ajuste (r² medio=0,18. No se observó asociación entre las respuestas y la temperatura en macollaje o en el ciclo. Se concluye que el AE resultó una fuente azufrada con similar eficiencia que el SA para aportar S al trigo en la Región Pampeana.Agronomic efficiency of elemental sulphur (AE compared with soluble and S-sulphate sulphur sources depends on reactivity of AE (e.g. particle size and environmental conditions (soil and climate. Although there is published information suggesting that elemental sulphur has similar effectiveness than soluble sulphur sources, the information is not conclusive. We hypothesized that agronomic efficiency of AE and soluble S sources are similar under the Pampas Region conditions. The objectives of the study were to: i. Evaluate S grain response to a reactive source of AE compared to a soluble S source under different S rates and soil and climate conditions. ii. Compare, for the group of experiments, agronomic S efficiency between S sources. iii: Relate S responses with soil and climatic variables. Eight field experiments were conducted during two successive years on cropping systems in the Pampas Region. The experimental design was a randomized complete block with four or six replicates and a factorial treatment arrangement (factor 1: S source, factor 2: S rate. The treatments were: check (without S application, fertilization with a micronized source of AE (95% of S and a fertilization treatment with ammonium sulphate (SA, 24%. Both sulphur sources were applied at two S rates. Sulphur rates were 10 and 30 kg ha¹ (year 1 and 15 and 30 kg ha-1 (year 2. In the first year, wheat responded significantly to S in four of five sites (p0.05 in most sites. When all sites were combined, sulphur sources presented similar agronomic S efficiencies (p>0.05. The lower S rate (10 or 15 kg ha¹ was enough to provide S to the crop under the Pampas Region conditions. Grain yield responses to S were positively correlated

  11. O IMPACTO DA MIGRAÇÃO DAS EMPRESAS PARA OS NÍVEIS DIFERENCIADOS DE GOVERNANÇA CORPORATIVA DA BM&F BOVESPA SOBRE O RISCO E O RETORNO DE SUAS AÇÕES./THE IMPACT OF THE MIGRATION OF BUSINESSES TO THE DIFFERENTIATED LEVELS OF BM&F BOVESPA’S CORPORATE GOVERNANCE OVER THE AND RETURN OF ITS SHARES.

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    Ricardo Luiz Menezes da Silva

    2012-08-01

    Full Text Available A transparência das informações é importante para se ter uma diminuição na assimetria das mesmas. Quanto mais informações de qualidade há sobre o negócio ou desempenho econômico e financeiro de determinada empresa, teoricamente, mais se pode esperar uma diferente percepção do risco por parte do investidor. O objetivo deste estudo foi verificar se a iniciativa das empresas em aderir aos Níveis Diferenciados de Governança Corporativa da BM&F BOVESPA impacta tanto no risco quanto no retorno dos preços de fechamento de suas ações. Para isso, foram utilizados os retornos diários de 252 dias antes e após a adesão das empresas aos NDGC. Foram feitos os testes de Kolmogorov-Smirnov para análise da normalidade, o teste paramétrico de médias emparelhadas e o teste não paramétrico de Wilcoxon para medidas de risco absoluto (desvio-padrão e relativo (beta, além de retorno. Foram analisados os comportamentos dos papéis de 48 empresas. Os resultados mostraram que as médias dos retornos das açõesempresariais não apresentaram diferenças significativas antes e após a data de adesão aos NDGC. Por outro lado, as proxies de risco apresentaram-se significativamente diferentes./ The transparency of information is important to diminish the asymmetry of information. Themore quality information there is about the business, or financial and economic performance of a certain company, theoretically, the more one can expect a different perception of risk by the investor. The aim of this study was to verify whether the initiative of the companies to adhere to BM&F BOVESPA’s Differentiated Levels of Corporate Governance impacts both at risk and return of the closing price of its shares. For that, daily returns of 252 days before and after the accession of companies to NDGC were used. Over the measures of absolute risk (standard deviation and relative risk (beta, and return, Kolmogorov-Smirnov tests were made in order to analyze normality

  12. Avances en el pronóstico climático de las anomalías de lluvia en la Región Pampeana Advances in the climatic forecast of rainfall anomalies in the Pampa Region

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    Juan C. Labraga

    2011-12-01

    Full Text Available Los modelos globales de la circulación general de la atmósfera (MCGA son capaces de simular anomalías climáticas estadísticamente significativas de escala estacional o mayor, asociadas con anomalías en la temperatura de la superficie del mar. Los MCGA pueden estimar efectivamente el signo y la probabilidad de tales anomalías climáticas cuando su extensión es varias veces mayor que la resolución espacial del modelo. En este trabajo se presentan algunos avances en la estimación de las anomalías de la lluvia en 22 localidades de la Región Pampeana Argentina mediante downscaling estadístico de la información producida por un ensamble de veinte simulaciones con el MCGA CSIRO-9, prescribiendo la temperatura de la superficie del mar de acuerdo con los valores diarios observados en el período 1987-1998. El downscaling estadístico de la lluvia produjo una mayor correlación con las observaciones locales que los datos de lluvia del MCGA interpolados sobre cada sitio. Los resultados de un Análisis de las Componentes Principales aplicado a los datos observados y estimados indican que este método de downscaling permite discernir áreas con diferente comportamiento de la lluvia dentro de la región de estudio.Atmospheric general circulation models (AGCM are able to simulate statistically significant climate anomalies of seasonal or larger time-scales, associated with anomalies in the sea surface temperature. AGCMs can effectively estimate the sign and probability of such climate anomalies whenever their extent is several times greater than the spatial resolution of the model. Some progress attained in the estimation of rainfall anomalies in 22 sites of the Pampa Region, Argentina, by means of statistical downscaling of the output from an AGCM are presented in this work. Downscaling models were based in the multiple lineal regression method. Climatic anomalies of the atmospheric independent variables required in the rainfall downscaling

  13. Exposure of pampas fox (Pseudalopex gymnocercus and crab-eating fox (Cerdocyon thous from the Southern region of Brazil to Canine distemper virus (CDV, Canine parvovirus (CPV and Canine coronavirus (CCoV

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    Silvia de Oliveira Hübner

    2010-06-01

    Full Text Available The exposure of 13 Brazilian free-ranging nondomestic canids (five pampas fox - Pseudalopex gymnocercus and eight crab-eating fox -Cerdocyon thous from Southern region of Brazil, to Canine distemper virus (CDV, canine parvovirus (CPV and Canine coronavirus (CCoV was investigated. Antibodies against CDV were detected in 38.5% (5/13 of the samples. There were anti-CDV antibodies in 60% (3/5 of P. gymnocercus and in 25% (2/8 of C. thous. The frequency was higher among the adults and males. Eleven canids (84.6% presented antibodies against CPV, 80% (4/5 were from P. gymnocercus and 87.5% (7/8 were from C. thous. There was no difference in positivity rate against CPV between gender and age. Antibodies against CCoV were detected in 38.5% (5/13 of the samples, with 60% (3/5 of positivity in P. gymnocercus and 25% (2/8 in C. thous. The frequency of antibodies against CCoV was higher among the adults and males. The study showed that these canids were exposed to CDV, CPV and CCoV.Foi investigada a ocorrência de exposição em 13 canídeos não domésticos de vida livre (cinco graxains-do-campo - Pseudalopex gymnocercus e oito graxains-do-mato - Cerdocyon thous da região sul do Brasil ao vírus da cinomose canina (CDV, parvovírus canino (CPV e coronavírus canino (CCoV. Anticorpos contra o CDV foram detectados em 38,5% (5/13 das amostras. Haviam anticorpos anti-CDV em 60% (3/5 dos P. gymnocercus e em 25% (2/8 dos C. thous. A freqüência foi maior entre machos e adultos. Para CPV, 11 canídeos (84,6% apresentaram anticorpos, 80% (4/5 eram da espécie P. gymnocercus e 87,5% (7/8 eram C. thous. Não houve diferença de positividade para o CPV entre sexos e idades. Anticorpos contra o CCoV foram detectados em 38,5% (5/13 das amostras, sendo 60% (3/5 de positividade entre os P. gymnocercus e 25% (2/8 entre os C. thous. A freqüência de anticorpos para CCoV foi maior entre os machos e adultos. O estudo revelou que estes canídeos foram expostos ao CDV, CPV

  14. Corrales de piedra, campos abiertos y pampas de camaruco: Memorias de relacionalidad en la meseta central de Chubut Stone yards, open fields and sacred places: Memories of relatedness in the Chubut´s central plateau

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    Ana Ramos

    2008-12-01

    Full Text Available La "cuestión indígena" como política de estado en Argentina ha estado acompañada por la elaboración académica de mapas étnicos. Las definiciones hegemónicas de estas entidades han presupuesto generalmente algún elemento "esencial" como, por ejemplo, fenotipos, uso de una lengua, o la aglutinación en torno a linajes consanguíneos. A partir de las reformulaciones de las teorías del parentesco desde el modelo heurístico de las sociedades de casas y las teorías sobre la relacionalidad proponemos una aproximación a la memoria social como marco alternativo de interpretación histórica. Esta contempla las prácticas sociales del parentesco y la objetivación de la continuidad de los grupos de pertenencia en las políticas y lugares de la memoria -corrales de piedra, actividades productivas y pampas de camaruco- en la región de la "meseta" de Chubut. Dichas relaciones con el espacio físico cuestionan tanto las definiciones académicas tradicionales de parentesco y de cacicazgo como las clasificaciones étnicas-nacionales.The "Indigenous issue" as a state policy in Argentina has been accompanied by an academic production of ethnic maps. Hegemonic definitions of these entities used to presume some "essential" elements like the phenotype, the use of language or consanguineous lineage membership. Based on the reformulation of kinship theory, which came from the heuristic model of houses and relatedness theory, we propose an approach to social memory as an alternative framework for historical interpretation. This includes kinship social practices as well as the materialization of group membership's continuity in policies and places of memory -such as stone yards, productive activities, open fields and sacred places- in the Chubut central plateau. Finally, we argue that regarding a physical space, these relations question not only the ethnic-national classifications but also the traditional academic definitions of kinship and chieftaincy.

  15. Registro de Nephridiophaga sp. (Protista: Nephridiophagidae en Apis mellifera (Hymenoptera: Apidae del Sur de la región Pampeana Record of Nephridiophaga sp. (Protista: Nephridiophagidae in Apis mellifera (Hymenoptera: Apidae of the southern Pampas

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    Santiago Plischuk

    2011-12-01

    Full Text Available Durante estudios prospectivos tendientes a la detección de protistas asociados a ápidos en la región Pampeana, se observó la presencia de esporos ovales bicóncavos y grupos de esporos (cúmulos en los túbulos de Malpighi de abejas de Dufaur, partido de Saavedra, sudoeste de la provincia de Buenos Aires. Los esporos maduros midieron 4,8 ± 0,05 x 2,4 ± 0,03 μm y la carga (intensidad promedió 5,71 ± 1,49 x 10(6 esporos/abeja. Las detecciones se efectuaron entre julio y octubre de 2006 y la prevalencia en las colmenas positivas osciló entre 1 y 16,7 %. Las características morfológicas de los esporos, el lugar de desarrollo y la especie huésped involucrada sugieren que el microorganismo en cuestión, pertenece al género Nephridiophaga y sería N. apis Ivani, especie tipo cuyo conocimiento es extremadamente limitado. El hallazgo constituye el primer registro de un nefridiofágido asociado a A mellifera fuera del continente europeo.During surveys for the detection of protists associated to Apidae in the Pampas region, biconcave oval spores, and spore clumps were observed in the Malpighian tubules of honeybees from Dufaur, Saavedra county, southwestern Buenos Aires province. Mature spores measured 4.8 ± 0.05 x 2.4 ± 0.03 μm, and mean spore load was 5.71 ± 1.49 x 10(6 per honeybee. Detections were from July to October 2006, and prevalence in positive colonies ranged from 1 to 16.7%. Morphology of the spores, the site of development, and the identity of the host species suggest that the isolated microorganism belongs to the genus Nephridiophaga and would be N apis Ivani, the type species, knowledge on which is extremely limited. The finding constitutes the first record of a nephridiophagid in honeybees outside of Europe.

  16. Indicadores de calidad física en suelos de la Región Pampeana Norte de Argentina bajo siembra directa Physical quality indicators in soils from the northern Pampa region of Argentina under no till management

    Directory of Open Access Journals (Sweden)

    Laura Ferreras

    2007-12-01

    conservation of soil properties associated both to fertility and tillage. Soil alterations induced by management may affect crop production since management practices influence organic matter distribution and nutrient dynamics, and also soil aggregation and porosity. The Argentinean Northern Pampa is one of the region of the world where soils have been subjected to an intensive agricultural use during the last decades, and where direct drilling has been increasingly adopted. The aim of the present work was to evaluate soil physical quality parameters from agricultural systems under no tillage, in soils representative of the Northern Pampa Region, and to compare them with the same soil type but under pristine condition. A soil physical characterization of plots under cropping was carried out on eleven fields included in the Nutrition Network of CREA Southern Santa Fe, with trials located in Santa Fe, Córdoba and Buenos Aires Provinces. Also, a sampling in an adjacent undisturbed sector with the same soil type was carried out. Soil composite samples were collected at two depths (0-0.08 m and 0.08 m to the lower limit of the Ap horizon. Water and ethanol stable aggregate percentage (Ea and Ee, respectively, total organic carbon (COT, bulk density (DA and maximum soil density were determined (DMAX. Mechanical resistance (RM was measured at 0.05 m increments from the soil surface to 0.35 m depth. Soils were clustered in two groups according to their texture: Group I (surface clay content between 215 and 265 g kg-1 and Group II (surface clay content between 98 and 170 g kg-1. Higher values of Ea, Ee and COT were found in both surface and deep layers in the undisturbed soil with respect to cropped soil (p < 0.05. Soils from Group I showed higher Ea, Ee and COT with respect to those from the Group II. Total organic carbon decrease because of management was between 10 and 44%. Direct relationships were found between Ea and COT, and Ee-COT, respectively. Soils from the Group I showed

  17. Hábitos de alimentación y su relación con el rendimiento académico de los estudiantes de la Carrera Profesional de Enfermería Técnica del I.E.S.T.P. “Pampas - Tayacaja” - 2015

    OpenAIRE

    Cáceres Flores, Bertha Guillermina

    2017-01-01

    La investigación tiene como objetivo principal es “Determinar la relación que existe entre los hábitos de alimentación y el rendimiento académico de los estudiantes de la Carrera Profesional de Enfermería Técnica del Instituto de Educación Superior Tecnológico Público “Pampas - Tayacaja”-2015”. La investigación es de tipo teórico, de diseño no experimental, transversal y correlacional. El nivel de investigación es correlacional, porque se busca asociar las variables hábitos de alimentación y ...

  18. Cambio agrario y nueva ruralidad: Caleidoscopio de la expansión sojera en la región pampeana Agrarian change and new rurality: Kaleidoscope of soya expansion in the Pampa region

    Directory of Open Access Journals (Sweden)

    Carla Gras

    2012-06-01

    Full Text Available En las últimas décadas, y en el marco de las tesis sobre la configuración de nuevas ruralidades, los pueblos y pequeñas localidades han vuelto a concitar la atención de las ciencias sociales. Lo rural se define como un espacio crecientemente polisémico, donde se redefinen los antes coincidentes contornos entre lo rural y lo agrícola. Nuestro interés en los pueblos rurales de la región pampeana parte de esa constatación y pretende, al mismo tiempo indagar en las implicancias de las transformaciones que se derivan de las profundas mutaciones operadas en el modelo de producción agropecuaria, las cuales involucraron, entre otros aspectos, una dinámica de "ganadores y "perdedores". La existencia de población que vive en pueblos y localidades rurales pero que no tiene relación laboral con el sector agropecuario, y de un mundo agrario profundamente transformado son los dos elementos cuyos reflejos, en los modos de configurar estos territorios nos interesa comprender. Nos interesa explorar cómo esta suerte de diferenciación entre "ganadores" y "perdedores" se expresó en las posiciones detentadas por los productores en las comunidades locales, tanto en lo que refiere a su lugar en la población y en la economía. Exploramos las diferenciaciones socioculturales que se generan y las tensiones y complejidades que adquiere la integración social en un mismo territorio, lejos de aquella idea de la comunidad que la define por la similitud u homogeneidad relativa de sus componentes, y por su estabilidad.In the last decades, and in the framework of the thesis on the configuration of a new rurality, villages and small towns have drawn the attention of the social sciences. Rurality is defined as increasingly polysemic, where the previous boundaries between rurality and agriculture have redefined. Our interest in the rural villages of the Pampa region stands on this understanding, and introduces another key process related to the deep changes

  19. Perception of climate variability, information use and strategies of the agents in front of risk. Characterizing mental models in decision-making of agriculturalists from Argentine pampas Percepción de variabilidad climática, uso de información y estrategias de los agentes frente al riesgo. Análisis de esquemas decisionales en agricultores de la región pampeana argentina

    Directory of Open Access Journals (Sweden)

    Andrés Barsky

    2008-01-01

    Full Text Available This article analyzes the elements that are considered by Pampean producers when making production decisions considering the climate as a factor. The article focuses on how producers perceive climate variability and on the type of information they manage when it comes to mid-term perspectives. During 2005, interviews were held with 60 producers, who were selected from two different zones of the Pampa region with different physical characteristics, thirty of them belonging to the central humid pampas in Buenos Aires province and the other thirty belonging toborder semiarid pampas located at Cordoba province. The results of the analysis help characterize the mental models behind the decision-making process in the individuals' perceptions, bearing in mind that their activity entails exposure to risk. The research's main objective is to propose communication measures that may help improve the use of climate forecasts by the social agents, assuming this is an available tool with significant potential to provide a more scientific support to the procedures of the production agents and to -improve economic earnings performance.Este artículo indaga acerca de qué elementos de análisis están presentes en las estrategias de los agricultores de las pampas argentinas a la hora de tomar decisiones de producción considerando el factor climático. El énfasis está puesto en cómo perciben la variabilidad climática y qué información manejan acerca de sus perspectivas a mediano plazo. Durante 2005 se entrevistaron a 60 productores, seleccionados de dos zonas pampeanas de diferentes características físicas. 30 personas correspondieron al área central húmeda y 30 personas a un área marginal semiárida. Los resultados del estudio apuntan a caracterizar los esquemas decisionales presentes en las percepciones de los individuos, teniendo en cuenta que su actividad supone una exposición al riesgo. El objetivo de fondo del trabajo de investigación es

  20. MUCHO MÁS QUE SÓLO APROVISIONAMIENTO LÍTICO: ACTIVIDADES EN CANTERAS Y PRÁCTICAS SOCIALES EN LAS FUENTES DE PAMPA OESTE, QUEBRADA SECA Y PUNTA DE LA PEÑA (ANTOFAGASTA DE LA SIERRA, CATAMARCA / Much more than just lithic procurement: activities at quarrie

    Directory of Open Access Journals (Sweden)

    Federico Miguel Bobillo

    2015-06-01

    Full Text Available En este trabajo se abordan las canteras y talleres asociados de Punta de la Peña, Quebrada Seca y Pampa Oeste, en Antofagasta de la Sierra (Catamarca, con el objeto de explorar la multiplicidad de actividades y prácticas sociales involucradas en la utilización de dichas fuentes. Se trata de tres fuentes de vulcanitas intensamente explotadas a lo largo de la secuencia prehispánica del área. De esta forma, se toma a las canteras no sólo como un depósito de rocas útiles para la subsistencia, sino como un escenario social donde confluyen y se materializan diferentes prácticas y expresiones sociales. Así, a la explotación de las rocas se suman toda una serie de tareas vinculadas, por ejemplo, con prácticas de enseñanza/aprendizaje y actividades de subsistencia, procesamiento/consumo y rituales. Esta aproximación considera a las canteras desde una perspectiva orientada a abordar las elecciones y prácticas llevadas a cabo por los agentes en contextos de aprovisionamiento, partiendo de la base de que estos actúan desarrollando una diversidad de actividades conectadas en torno a la apropiación de un recurso específico.Abstract  Quarries and workshops at Punta de la Peña, Quebrada Seca and Pampa Oeste (Antofagasta de la Sierra, Catamarca are considered in this paper. The goal is to explore the multiplicity of social activities and practices involved in the use of these quarries. These three vulcanite sources were intensively exploited during the pre-Hispanic history of the region. In this way, quarries are not only considered rock deposits useful for subsistence, but also a social scenario where different social practices and social expressions converge and are materialized. Thereby, series of linked tasks are added to rock exploitation. For example, teaching/learning practices and subsistence, processing/consumption and ritual activities. This approach considers quarries from a perspective oriented to the analysis of elections and

  1. Family farms in the Pampas region of Argentina. The use of production factors of production and their relationship with new family dynamics La agricultura familiar en la región pampeana argentina. La utilización de los factores de producción y su relación con nuevas dinámicas familiares

    Directory of Open Access Journals (Sweden)

    Melina Neiman

    2010-01-01

    Full Text Available The objectives of this work are, in a first place, know the relationship between family farming of the Pampas region of Argentina with the different factors of production trying to verify whether, in the context of this region increasingly specialized in the production of soybean, embedded in global marketing channels, it is possible to find a particular way of organizing work, relating to the land resource and / or capitalizing (invest in technology that distinguishes family farming from other forms of production, and on a second place, inquire about the processes of change that have occurred in the dynamics of these families, whose has adopted "modern" behaviors and values characteristic of urban families, to study their impact on the organization of the production unit. In this sense, we first observed the characteristic that presents the link between this type of units with different factors of production (land, capital and labor, and then, we suggest an analysis of the changes crossed by the families involved that have been influencing the way decisions are token and the impact on the production unit. For the methodological approach, we work with a survey of family farmers from a sample of agricultural establishments in the district of Junin, located on the Pampas, on the northwest of the province of Buenos Aires, Argentina.Este artículo tiene un doble objetivo. Por un lado, conocer cuál es la relación que guarda la agricultura familiar de la región pampeana argentina con los distintos factores de producción intentando verificar si es factible encontrar en estas unidades una forma particular de organizar el trabajo, relacionarse con el recurso tierra y/o capitalizarse (invertir en tecnología que diferencie a la agricultura familiar de otras formas de producción. Por el otro, indagar acerca de los procesos de cambio que se han venido produciendo en las dinámicas de estas familias, con comportamientos y valores "modernos" caracter

  2. Um mecanismo de provisionamento de tráfego para serviços diferenciados

    OpenAIRE

    Pacifico de Moura Neto, José

    2003-01-01

    Podemos verificar que o modelo de melhor esforço não é adequado para atender as necessidades das novas aplicações avançadas na rede. Para melhor disponibilizar estas aplicações é necessário a inclusão de qualidade de serviço como forma de oferecer garantias de desempenho. Algumas arquiteturas vêm sendo desenvolvidas como forma de oferecer garantias de QoS fim a fim, entre elas [1][13][25]. Dentre estas, a Arquitetura Chameleon se destaca apresentando um modelo inovador de ne...

  3. Controle fuzzy espacialmente diferenciado para um sistema de irrigação

    OpenAIRE

    Feliciano, Rafaelle de Aguiar Correia

    2012-01-01

    Projetos de irrigação tradicionais não determinam localmente a disponibilidade de água no solo. Assim, podem ocorrer ciclos irregulares de irrigação: alguns insuficientes, o que provoca déficit de água; outros em demasia, o que causa falta de oxigenação nas plantas. Devido à natureza não-linear do problema e do ambiente multivariável de processos de irrigação, a lógica fuzzy é sugerida como substituta aos sistemas comerciais de irrigação tipo ON-OFF com temporização pré-definid...

  4. Efecto de las enmiendas básicas sobre el complejo de cambio en algunos suelos ácidos de la Región Pampeana Application of basic amendments on acid soils of the Pampa Region: effect on the soil exchange complex

    Directory of Open Access Journals (Sweden)

    Guillermo Millán

    2010-12-01

    Full Text Available La acidez edáfica causa problemáticas productivas derivadas de disturbios microbiológicos, aspectos nutricionales y hasta fitotoxicidad de Al3+. El objetivo de este trabajo es: a evaluar la capacidad de intercambio catiónico y dotación de nutrientes básicos de algunos suelos ácidos del ámbito de la Pradera Pampeana; b cuantificar el Al3+ de su solución interna; c evaluar la incidencia de enmiendas básicas sobre el complejo de cambio. Se analizó el pH actual/potencial, el complejo de cambio y Al3+ intercambiable en 10 suelos Argiudoles y Hapludoles seleccionados por su acidez. Adicionalmente se evaluó la capacidad de intercambio catiónico a cada nivel de pH del suelo. Los suelos estudiados presentaron deficiencias relativas de Ca+2, en relación a Mg+2 y K+, y en menor medida de Mg+2 en relación al K+. Los valores de pH actual entre fuerte/ligeramente ácidos, se correspondieron con un pH potencial entre muy fuerte/ medianamente ácido. El encalado propició el aumento de la capacidad de intercambio catiónico y el Ca intercambiable. Si bien el Al3+ intercambiable no alcanzó niveles de toxicidad, el agregado de cualquier combinación de corrector y dosis fue eficiente para disminuirlo entre 4 y 5 veces, respecto de la situación original. El yeso no modificó el efecto de la caliza sobre el Al3+, pero su adición a la dolomita redujo la eficiencia del carbonato. Las dosis más eficientes para reducir el contenido de Al3+ intercambiable fueron las de 1.500 y 2.000 kg ha-1, dentro de cada corrector.Edaphic acidity causes productivity problems due to microbiological and nutritional disturbances and Al+3 phytotoxicity. The purpose of this study was to: a evaluate the cation exchange capacity and the amount of basic nutrients present in some acid soils of the Pampa Region, b evaluate the exchangeable Al3+ concentration, and c assess the effect of different rates and types of alkaline amendments on the exchange complex. Real and

  5. Melhoria do processo Hatschek, por meio de tratamento de dados históricos, para fabricação de telhas onduladas.

    OpenAIRE

    Aline Basso de Oliveira

    2010-01-01

    As telhas de cimento-amianto são utilizadas mundialmente nas construções comerciais, residenciais e industriais. O amianto foi a primeira aplicação de fibra natural em escala industrial. Esta fibra foi incorporada na forma do mineral (asbesto) como reforço de matrizes à base do cimento. O processo de fabricação de telhas de cimento-amianto mais utilizado mundialmente foi patenteado em 1900 por Ludwig Hatschek, recebendo o mesmo nome. O objetivo deste trabalho foi a melhoria do processo indust...

  6. The Pampas are vanishing under water | IDRC - International ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    "But, based on the current situation, trees would have to be planted on more than ... hiding the fields behind the trees if we don't change our agricultural model, ... the CONICET and INTA teams also advocate a return to extensive cattle grazing.

  7. Preliminary study on the use of the 137Cs method for soil erosion investigation in the pampean region of Argentina

    International Nuclear Information System (INIS)

    Bujan, A.; Yanez, M.S.; Santanatoglia, O.J.; Chagas, C.; Massobrio, M.; Castiglioni, M.; Ciallella, H.; Fernandez, J.

    2000-01-01

    Soil erosion is the most important degradation process in Argentine. According to the estimation of 4.9 million ha in Pampa Ondulada Region, 1.600.000 ha (36% of agricultural soils) are affected by the erosion. Field measurements of soil erosion and sediment deposition using classical techniques are difficult, time consuming, and expensive but indispensable to feed the prediction models for conservation practices design and farm planning. Many authors have reported that the measurement of fallout nuclides is useful tool to characterize geomorphical processes. Walling and He proposes models for converting 137 Cs depletion/enrichment amounts to net soil loss/deposition. These models are based in the comparison between a reference 137 Cs profile in a long term undisturbed site (control site) and the 137 Cs profiles in the suspected eroded or deposited sites in the landscape. The aim of this study is to provide a complete and well representative set of data on the erosion intensity in topographical conditions for the Pampa Ondulada Region in Argentine by using a tracer technique. The study area is a small watershed (about 300 ha), located in Arroyo del Tala medium basin, within Partido of San Pedro in Buenos Aires Province, Argentine. This paper presents a group of results from a detailed investigation of erosion and sediment delivery, within a 49 ha cultivated field study site in this watershed. The base of sampling strategy is the grid approach. A reference inventory, representing the local fallout input, was searched for at a site experiencing neither erosion nor deposition. Radiocaesium analyses were made at the Nuclear Regulatory Authority Laboratory by a GE Hp detector. To make an interpretation of 137 Cs distribution of soil losses and sedimentation, the Mass Balance Model 2 was used (Walling and He 1997). The erosion/deposition rates from Mass Balance Model 2 are in the range of 0 to -30 t·ha -1 ·y -1 for erosion, and 0 to 19 t·ha -1 ·y -1 for deposition

  8. Tratamientos diferenciados para sentenciados por delitos sexuales en contra de niñas y niños /

    OpenAIRE

    Flores Díaz, Irma Leticia sustentante.

    2009-01-01

     tesis que para obtener el grado de Doctor en Derecho, presenta Irma Leticia Flores Díaz ; asesor Juan N. Silva Meza, Olga María del Carmen Sánchez Cordero, Luciana Esther Ramos Lira. xv, 579 páginas : ilustraciones. Doctorado en Derecho UNAM, Facultad de Derecho, 2009

  9. COMPORTAMIENTO DE LOS SERVICIOS DIFERENCIADOS (DIFFSERV Y LOS SERVICIOS INTEGRADOS (INTSERV EN REDES IP PEQUEÑAS

    Directory of Open Access Journals (Sweden)

    Danilo Alfonso López Sarmiento

    2011-08-01

    Full Text Available En el presente artículo se muestran los resultados obtenidos de la implementación de los modelos Diffserv e IntServ utilizando Network Simulator NS-2.33 sobre plataformas Linux con el fin de comparar el desempeño de los modelos, en factores como el throughput, la pérdida de paquetes, el jitter y el retardo.

  10. PERMANÊNCIA DA MEMBRANA SEMIPERMEÁVEL NA PELE DO RECÉM-NASCIDO: UM CUIDADO DIFERENCIADO

    Directory of Open Access Journals (Sweden)

    KARLA MARIA CARNEIRO ROLIM

    2010-01-01

    Full Text Available El propósito del estudio fue identificar la colonización bacteriana después de la remoción de la membrana semipermeable del tórax anterior de los recién nacidos pre-términos (RNPTs. Es prospectivo, exploratorio y descriptivo, realizado en una unidad de terapia intensiva neonatal, en Fortaleza-CE-Brasil. La población estudiada comprendió diez RNPTs con peso <1.500 gramos y edad de gestación de <32 semanas, que recibieron la membrana semipermeable sobre la piel. Los datos fueron recogidos de marzo a mayo/ 2009, abarcó la búsqueda de los historiales médicos para rellenar los datos de identificación, colecta del material, y análisis de muestras de la membrana en el laboratorio de microbiología. Durante la permanencia de la membrana semipermeable sobre la piel del RNPT, no fue observada ninguna alteración dermatológica o presencia de infección. Las culturas de la piel detectaron Staphylococcus epidermides, Staphylococcus áureo, Escherichia coli, Klebsiella, Pseudomonas, Serratia y Candida albicans, dichos microorganismos reflejan el tipo de colonización nosocomial.

  11. Rangelia vitalii and Hepatozoon canis coinfection in pampas fox Lycalopex gymnocercus from Santa Catarina State, Brazil

    Directory of Open Access Journals (Sweden)

    Maria Regina Lucas da Silva

    2018-05-01

    Full Text Available Abstract Rangelia vitalii is a haemoparasite that infects erythrocytes, white blood cells and the cytoplasm of endothelial cells of blood capillaries of canids in South America, and has been detected in both domestic dogs and sylvatic canids. Hepatozoon canis is a parasite that infects neutrophils and monocytes of many mammalian hosts. This study reports the infection of Lycalopex gymnocercus from Santa Catarina, Brazil, with R. vitalii and H. canis. The piroplasm was observed on both blood smears and molecular tests. Many large piroplasms were detected inside the erythrocytes, with round, oval, or teardrop-shaped organism, that occurred singly or in pairs. They had an abundant, pale blue cytoplasm and decentral dark red small nucleus. The animal was also infected with H. canis that was detected only by molecular tests. The majority of haematological and biochemistry parameters were within the reference values for domestic dog and wild canids.

  12. Rangelia vitalii and Hepatozoon canis coinfection in pampas fox Lycalopex gymnocercus from Santa Catarina State, Brazil.

    Science.gov (United States)

    Silva, Maria Regina Lucas da; Mattoso, Cláudio Roberto Scabelo; Costa, Adson; Saito, Mere Erika; Tchaicka, Lygia; O'Dwyer, Lucia Helena

    2018-05-24

    Rangelia vitalii is a haemoparasite that infects erythrocytes, white blood cells and the cytoplasm of endothelial cells of blood capillaries of canids in South America, and has been detected in both domestic dogs and sylvatic canids. Hepatozoon canis is a parasite that infects neutrophils and monocytes of many mammalian hosts. This study reports the infection of Lycalopex gymnocercus from Santa Catarina, Brazil, with R. vitalii and H. canis. The piroplasm was observed on both blood smears and molecular tests. Many large piroplasms were detected inside the erythrocytes, with round, oval, or teardrop-shaped organism, that occurred singly or in pairs. They had an abundant, pale blue cytoplasm and decentral dark red small nucleus. The animal was also infected with H. canis that was detected only by molecular tests. The majority of haematological and biochemistry parameters were within the reference values for domestic dog and wild canids.

  13. Territorial ordering in Toay area and surroundings, La Pampa province, Argentina

    International Nuclear Information System (INIS)

    Carballo, O.; Sbrocco; J; Calmels, A.; Sotorres, E.; Miglianelli, C.

    2004-01-01

    This present work aims to provide a territorial ordering in an area limited by the 36 grades 39 minutes and 36 grades 43 minutes Southern Parallels and the 64 grades 20 minutes and 64 grades 27 minutes. Meridians from the same hemisphere; within such area, the population from Toay and surroundings are held/contained. The empiric method employed was taken from Gomez Orea (1993). The area was divided into environmental synthesis units and through the use of different proposed tasks it was possible to reach an objective description of the area with the distribution of its varied units [es

  14. NPP Grassland: Pampa De Leman, Argentina, 1980-1982, R1

    Data.gov (United States)

    National Aeronautics and Space Administration — This data set contains two ASCII files (.txt format). One file contains monthly productivity data measured on an arid dwarf-shrub steppe in northern Patagonia,...

  15. La préparation aux inondations dans la Pampa argentine | CRDI ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    4 mai 2016 ... Ils ont analysé la profondeur des eaux souterraines et consulté des données sur les précipitations pour plus de 20 sites répartis sur un territoire de 28 000 kilomètres carrés, grâce à diverses techniques de télédétection. À la lumière de leurs travaux, ils estiment qu'un système d'alerte rapide faisant appel à ...

  16. Agriculture on the pampas and familiar roles on 1960 s decade

    OpenAIRE

    Gutiérrez, Talía Violeta

    2009-01-01

    En los años sesenta del siglo XX la región pampeana vivía una etapa de modernización y expansión productiva que fue acompañada de una mayor urbanización de la población. Esta situación no significó que desapareciera el interés en definir el lugar de las familias en la explotación agrícola antes bien pensamos que se intensificó y complejizó. El objetivo del presente artículo es analizar el papel atribuido a la familia del productor pequeño o mediano y los roles asignados a sus distintos miembr...

  17. Indicators of biological contamination associated with water erosion in basin belonging the rolling pampa, Argentina

    OpenAIRE

    Chagas, Celio I.; Morettón, Juan; Santanatoglia, Oscar J.; Paz, Marta; Muzio, Humberto; De Siervi, Marcelo; Castiglioni, Mario

    2006-01-01

    La producción agropecuaria utiliza el 70% de los recursos hídricos superficiales. Una parte de esa agua es consumida por la ganadería, principalmente en forma de bebida animal. Existe un importante riesgo de contaminación biológica del agua asociada a dicha actividad, debido a que los patógenos eliminados a través de las deyecciones y orinas animales pueden ser transportados a las vías de agua, a través del escurrimiento superficial. El presente trabajo se realizó en la cuenca del arroyo del ...

  18. Del turismo “cultural” al “rural”: un caso de la Pampa bonaerense (Argentina

    Directory of Open Access Journals (Sweden)

    Cecilia Pérez Winter

    2017-07-01

    Full Text Available En este artículo se examina el proceso de turistificación del partido de Exaltación de la Cruz (Argentina, promovido por el gobierno municipal. El interés es analizar cómo los procesos locales y globales inciden en la configuración de modalidades turísticas, a partir de la selección y mercantilización de elementos “naturales” (rurales e históricos-culturales. La investigación aquí expuesta se construyó a través del trabajo de campo realizado en el periodo 2011-2015 en la ciudad cabecera, Capilla del Señor. Allí se observó que los criterios establecidos en los procesos de patrimonialización fueron implementados para construir, en una primera etapa, un turismo “cultural” que permitió consolidar determinados discursos y representaciones de la ciudad. A su vez, se constata que la práctica turística utiliza pautas más flexibles, al adecuarse a las demandas del mercado turístico global, llevando a incluir, en una segunda etapa, elementos vinculados con la ruralidad del partido, los cuales eran desestimados anteriormente.

  19. Estrategias regresivas en la pampa globalizada y las fronteras entre lo rural y lo urbano

    Directory of Open Access Journals (Sweden)

    Hugo E. Ratier

    2003-11-01

    Full Text Available En el centro de la Provincia de Buenos Aires (Partidos de Azul y Olavarría aparecen, entre los recursos para defenderse de la globalización y su secuela de políticas precarizadoras del trabajo, las que llamamos estrategias regresivas. Ante el abandono por parte del Estado del asesoramiento a los productores agrícolas, tanto familiares como asalariados, la gente de campo recurre a sus propios saberes y a sus redes solidarias o simplemente relacionales, para recrear actividades productivas, retroceder hacia formas paternalistas o clientelísticas pre-sindicales en términos de empleo, e incluso arbitrar soluciones tecnológicas ad-hoc. Trabajadores urbanos retornan al campo, y aparecen formas mixtas de actividades rural-urbanas con sede variable. De tal forma se genera un solo espacio donde se procuran salidas a la crisis. Esto suscita interrogantes teóricos en tomo a la llamada nueva ruralidad y a los cambios concomitantes en la calificación del espacio socio geográfico.

  20. Domínios diferenciados e refluxos identitários: o pensamento católico “antimoderno” no Brasil

    Directory of Open Access Journals (Sweden)

    Rodrigo Coppe Caldeira

    2009-05-01

    Full Text Available Este artigo tem como objetivo visualizar a formação de um grupo católico brasileiro, o grupo que se forma em torno de Plínio Corrêa de Oliveira e sua suposta identidade “antimoderna”. Além de buscar rapidamente circunscrever o conceito de modernidade e historicizar sobre a gênese do grupo e de suas principais idéias, aponta algumas possibilidades teóricas para a leitura do aspecto identitário. O texto reflete pesquisa de mestrado intitulada “Entre a verdade e a sedução: um estudo sobre a inflexão católica ‘antimoderna’ no Brasil”, que está sendo realizado junto ao Programa de Pós-graduação em Ciência da Religião da Universidade Federal de Juiz de Fora.Palavras-chave: Modernidade; Catolicismo; Identidade.ABSTRACTThis article aims at visualising the formation of a Brazilian catholic group, that around Plínio Corrêa de Oliveira and his alleged ‘anti-modern’ identity. After a brief consideration of the concept of modernity and a short background of the group formation and its main ideas, it also points out some theoretical possibilities of reading the identity feature. The text results from a Master’s Degree research work entitled ‘Between truth and seduction: a study of the “anti-modern” catholic inflection in Brazil’, developed in the Programme of Postgraduate Studies of Religion Science in the Universidade Federal de Juiz de Fora (Federal University of Juiz de Fora, State of Minas Gerais.Key words: Modernity; Catholicism; Identity.

  1. El ocio hostelero en dos ámbitos urbanos diferenciados: Malasaña (Madrid y Cimadevilla (Gijón

    Directory of Open Access Journals (Sweden)

    Rafael Suárez Muñiz

    2015-12-01

    Full Text Available Resumen Este proyecto consiste en la realización de un análisis comparativo del ocio hostelero entre dos fragmentos del casco histórico de dos ciudades de escala distinta: el barrio de Cimadevilla de Gijón (ciudad mediana y el sub-barrio de Malasaña de Madrid (gran metrópoli. El estudio parte contextualizando dicha actividad desde la década de 1960-1970 y continua desarrollándose a partir del análisis de una minuciosa cartografía que señala la organización urbana tripartita (física, social y temporal del ocio hostelero en estos ámbitos. Palabras clave Ocio, hostelería, Movida Madrileña, locales de ocio nocturno, locales de ocio diurno, zonificación Abstract This project consists of a comparative analysis about the leisure within catering industry between two fragments of the old town of two different-sized cities: the neighbourhood of Cimadevilla in Gijón (medium-sized city and the sub-neighbourhood of Malasaña in Madrid (metropolis. The study begins contextualizing such activity since the decade of 1960-1970 and continues being developed through an analysis of a thorough cartography, which points out the tripartite organization (physical, social and temporal of the leisure of catering industry in these areas. Keywords Leisure, catering industry, Movida Madrileña, Night bars, Daily restaurants, zoning

  2. Análisis Diferenciado Del Perfil Y De La Motivación Del Turista Nacional Y Extranjero En La Ruta Del Vino Del Marco De Jerez

    Directory of Open Access Journals (Sweden)

    TOMÁS LÓPEZ-GUZMÁN

    2013-01-01

    Full Text Available Las motivaciones y actitud de los turistas en la actualidad están permitiendo el desarrollo de nuevos productos y destinos que permiten satisfacer las nuevas demandas de los viajeros. En este artículo presentamos una investigación centrada en el turismo del vino, en concreto la Denominación de Origen Jerez-Sherry. Esta denominación gira en torno a una ruta del vino cuyas bodegas reciben alrededor de 500.000 visitas anualmente. Así mismo, presentamos los resultados obtenidos de un trabajo de campo, llevado a cabo dentro de las propias bodegas, donde se ha realizado una encuesta a los turistas para conocer sus motivaciones y percepciones. Los principales resultados de esta investigación nos muestran el elevado grado de satisfacción de los turistas respecto a la bodega que han visitado, así como la interrelación existente entre el vino, la gastronomía local y el creciente interés de los viajeros por todo lo relacionado con la cultura del vino.

  3. Convulsões na Gravidez e Puerpério - Diagnóstico Diferenciado. A Propósito de um Caso Clínico

    OpenAIRE

    Ramos, R; Roncon, A; Casqueiro, L

    2006-01-01

    As convulsões na gravidez e puerpério, constituem situações que exigem um diagnóstico diferencial cuidado, para uma terapêutica adequada com importância no prognóstico. Os autores apresentam um caso clínico de doente com convulsões no puerpério, e discutem a avaliação diagnóstica.

  4. Photovoltaic power: a new perspective for energetic planning, using different analysis criteria; Energia fotovoltaica: uma nova perspectiva para o planejamento energetico, usando criterios diferenciados de analise.

    Energy Technology Data Exchange (ETDEWEB)

    Lacchini, Corrado [Universidade Luterana do Brasil (ULBRA), Gravatai, RS (Brazil). Fac. de Administracao; Santos, Joao Carlos Vernetti [Universidade Luterana do Brasil (ULBRA), Canoas, RS (Brazil). Dept. de Engenharia Eletrica

    2010-07-01

    This article proposes a comparison between photovoltaic and coal fired power plants for electrical energy generation, based on coal reserves in the State of Rio Grande do Sul. Costs associated to the two technologies are compared and considerations are made to costs for prevention and compensation of air, soil and water pollution generated from coal burning, and to funding alternatives with carbon credits that would help the installment of a non pollutant technology. Considering the decreasing trend of the cost of photovoltaic watt, a suggestion for initial financing and limited support is presented, similar to what the European countries make, covering the infant period of the photovoltaic technology in Brazil. (author)

  5. Biological dosimetry of patients with differenced carcinoma of thyroid treated with Iodine-131; Dosimetria biologica de pacientes con carcinoma diferenciado de tiroides tratados con Iodo-131

    Energy Technology Data Exchange (ETDEWEB)

    Vallerga, M. B.; Rojo, A.M.; Taja, M.R.; Deluca, G.; Di Giorgio, M. [Autoridad Regulatoria Nuclear Av. Del Libertador 8250 (C1429BNP). Buenos Aires (Argentina); Fadel, A. [Hospital General de Agudos Dr. Carlos Durand Av. Diaz Velez 5044. Buenos Aires (Argentina); Cabrejas, M.; Valdivieso, C. [Hospital de Clfnicas Jose de San Martin Av. Cordoba 2351 (CP1120). Buenos Aires (Argentina)]. e-mail: mvallerg@cae.arn.gov.ar

    2006-07-01

    The administration of I-131 to patient with Differentiated Thyroid Carcinoma (CaDiT) it is used inside the therapeutic outline as later step to the thyroidectomy. However, the good activity to give is of difficult determination due to factors such as, the variability in the capacity of tumoral reception of the I-131, distribution of the pharmaceutical, physiologic status, other associate pathologies, grade of advance of the illness, and previous treatments. Additionally, the activity to administer is dependent of the dose of tolerance in the healthy tissues; superior dose to 2 Gy in bone marrow, its could drive to myelotoxicity. At the moment, the form more extended of administration it is the empiric prescription that considers clinical parameters and of laboratory for their determination. Presently work, the protocol of applied treatment incorporates the evaluation for internal dosimetry and biological dosimetry to estimate absorbed dose in bone marrow. The biological estimate of the dose of these patients is based on the quantification of chromosomal aberrations whose frequency is referred to a curve-dose response in which the lymphocytes is irradiated in vitro with I-131, allowing to determine the in vivo dose to the patient's circulating lymphocytes. The objective of the present work is to determine the applicability of different cytogenetic essays in the estimate of the absorbed dose to the whole body or specific organs. Three patients were evaluated with CaDiT. Their treatment protocol consisted on a tracer administration of radioactive iodine of 74 - 111 MBq (2 - 3 mCi) and a therapy 7,4 - 11,1 GBq (200 - 300 mCi). Previous to the tracer administration and 8 days post-therapeutic administration took samples of veined blood that were evaluated by biological dosimetry by means of the application of the techniques: conventional cytogenetic Micronucleus and FISH (Hybridization in situ by Fluorescence). Starting from the frequencies of observed chromosomal aberrations it was considered absorbed dose to whole body. The obtained doses were compared by the different biological methods used. The evaluation by internal dosimetry of the data obtained tracer post-activity allowed to personalize the activity of I-131 to administer, starting from physical-mathematical models that consider the particular biokinetics of each patient (MIRD methodology). The doses estimated by the used biological dosemeters were consistent among them. It was discussed its scopes and limitations to be applied in the validation of the dosimetric estimation based on models, in order to administer a therapeutic dose protecting the patient of the adverse effects of the internal radiotherapy in organs that are not target of the same one. The acquired experience is considered of utility to give answer in cases of radioiodine incorporation in occupationally exposed personnel. (Author)

  6. Radioiodine therapy effects on offspring of patients with differentiated thyroid carcinoma; Efeitos da radioiodoterapia nas geracoes futuras de mulheres com carcinoma diferenciado de tireoide

    Energy Technology Data Exchange (ETDEWEB)

    Brandao, Carmen Dolores Goncalves [Hospital Universitario Clementino Fraga Filho, Rio de Janeiro, RJ (Brazil). Servico de Endocrinologia]. E-mail: loloi@zaz.com.br; Antonucci, Jane [Instituto Nacional do Cancer, Rio de Janeiro, RJ (Brazil). Hospital das Clinicas. Servico de Medicina Nuclear; Correa, Nilson Duarte [Hospital dos Servidores do Estado, Rio de Janeiro, RJ (Brazil). Servico de Medicina Nuclear; Corbo, Rossana; Vaisman, Mario [Universidade Federal, Rio de Janeiro, RJ (Brazil). Faculdade de Medicina

    2004-02-01

    Radioiodine therapy has attained a significant role in the treatment of differentiated thyroid cancer. The literature addressing possible secondary effects of {sup 131} I is limited, although there has been increasingly interest in this field. A more comprehensive understanding of the mutagenic effects of radiation on the offspring of women exposed to {sup 131} I is mandatory in view of the possibility of occurrence of miscarriages, congenital abnormalities and malignancies in these children. In this review, we found that many reports on safety of this type of treatment in female patients in reproductive age recommend that pregnancy should be avoided for at least one year after therapeutic administration of radioiodine. (author)

  7. Optimization of the therapeutic dose of {sup 131}I for thyroid differentiated carcinoma; Otimizacao da dose terapeutica com {sup 131}I para carcinoma diferenciado da tiroide

    Energy Technology Data Exchange (ETDEWEB)

    Lima, Fabiana Farias de

    2002-09-01

    I-131 thyroid cancer therapy is based on the strategy of concentrating radioactive iodine in the thyroid tissue, to completetly eliminate thyroid tissue and functioning thyroid cancer metastases remaining after thyroidectomy. In Brazil, fixed activities of {sup 131} I generally are given, sometimes either delivering insufficient activities to ablate all of the remnants, or unnecessarily high activities, with patients remaining in the hospital for some period of time. This investigation proposes a protocol of individualized planning of ablative doses, based on individual patients metabolisms and measured thyroid remnant masses. Simulated thyroid remnants were fabricated in various forms, volumes and activities, and optimum image acquisition parameters were determined using Single-Photon Emission Computed Tomography 9SPECT). Resultant images were evaluated, to determine the apparent volumes and the {sup 131} I concentrations. I-131 metabolism was studied in 9 patients who had undergone thyroidectomies. Their thyroid remnant masses were determined applying the same parameters used in SPECT simulation studies, and the optimum activity for their therapy was calculated and compared to the established fixed activity of 3.7 GBq (100 mCi), which would have normally been assigned. Background subtraction using the method of percent maximum counts, using a value of 67.5%, combined with scatter correction (triple energy window method), was shown to be optimum for SPECT quantification of volumes between 3-10 ml. Errors in the method were below 9% for sources with regular geometries and around 11% for sources with irregular geometries. In the patient studies, it was observed that 78% of patients could have received reduced activities of {sup 131} (from 0.8-3-2. GBq (20-87 nCi). In addition, 33% of these patients could have received low enough activities to have discharged from the hospital, using an individualized administration scheme. This could also have resulted in a dose reduction for many organs, such as the narrow and gonads, of up to 78.4%.Possible benefits to the institution also include the use of less radioactive material and a reduction in radiation exposures to the staff during the manipulation and administration of the {sup 131} I. To facilitate the calculations of the optimum therapeutic activity of {sup 131} I for individual patients, a simple and fast dose planning program was created (PlanDose). The program has been set up to evaluate thryroid remant ablation, but it can also be used for the calculation of the activity to be administered for treatment of hyperthyroidism. This protocol of calculated optimal patient-specific {sup 131} I. activities allows a better determination of the necessary ablative dose for patients with differentiated carcinoma of the thyroid, and is an example of optimizing the practice of radiation protection. (author)

  8. Funcionamiento Ejecutivo y TDAH. Aportes Teóricos para un Diagnóstico Diferenciado entre una Población Infantil y Adulta

    OpenAIRE

    Mauricio Alejandro Cervigni; Florencia Stelzer; Cecilia Clara Mazzoni; Carlos Dante Gómez; Pablo Martino

    2012-01-01

    La extrapolación terminológica de la nomenclatura utilizada para definir trastornos asociados a déficits de funcionamiento ejecutivo en el adulto, ha sesgado la comprensión de los procesos que subyacen a la sintomatología del TDAH en infantes. Dado que las funciones ejecutivas presentan un desarrollo posnatal prolongado, las alteraciones de éstas en el niño y el adulto pueden diferir en su etiología y su posibilidad de recuperación. En el presente trabajo se abordan los procesos ejecutivos de...

  9. Funcionamiento Ejecutivo y TDAH. Aportes Teóricos para un Diagnóstico Diferenciado entre una Población Infantil y Adulta

    Directory of Open Access Journals (Sweden)

    Mauricio Alejandro Cervigni

    2012-01-01

    Full Text Available La extrapolación terminológica de la nomenclatura utilizada para definir trastornos asociados a déficits de funcionamiento ejecutivo en el adulto, ha sesgado la comprensión de los procesos que subyacen a la sintomatología del TDAH en infantes. Dado que las funciones ejecutivas presentan un desarrollo posnatal prolongado, las alteraciones de éstas en el niño y el adulto pueden diferir en su etiología y su posibilidad de recuperación. En el presente trabajo se abordan los procesos ejecutivos desde un enfoque sociohistórico. Se concluye señalando la importancia de dicho enfoque para el diagnóstico y abordaje terapéutico del TDAH en niños. Asimismo se sugiere la utilización de la nomenclatura de "Síndrome Anejecutivo" en adultos y "Trastorno Disejecutivo" en niños, con el fin de clarificar las diferencias entre ambas entidades nosológicas.

  10. Staphylococcus lugdunensis: um olhar diferenciado no laboratório clínico Staphylococcus lugdunensis: a different view in the clinical laboratory

    Directory of Open Access Journals (Sweden)

    Alessandro Conrado de Oliveira Silveira

    2011-04-01

    Full Text Available Os estafilococos coagulase negativos (ECNs são cocos Gram-positivos usualmente considerados contaminantes em laboratórios de microbiologia clínica. Apesar de pertencer a este grupo, Staphylococcus lugdunensis pode causar infecções complicadas, como endocardites, infecções de pele e tecidos moles, osteomielites, entre outras. Além da formação de biofilmes, apresenta patogenicidade similar ao Staphylococcus aureus. É um dos principais agentes causadores de endocardites, com taxa de mortalidade de até 70%. Pode ser confundido com S. aureus quando se utilizam testes rápidos para sua identificação, como a pesquisa de clumping factor, no caso de teste de coagulase em lâmina, ou em testes de aglutinação direta em látex. Pode ser facilmente identificado por meio de provas bioquímicas acessíveis, como a presença de atividade da ornitina descarboxilase e pirrolidonil arilamidase (PYR. Apresenta sensibilidade à maioria dos agentes antimicrobianos, devendo ser pesquisada rotineiramente a presença de betalactamases e do gene mecA por meio de testes com cefalosporina cromogênica e suscetibilidade à cefoxitina, respectivamente. Convém salientar que os critérios interpretativos utilizados para avaliar a sensibilidade à cefoxitina são os mesmos preconizados para S. aureus e diferentes dos utilizados para os outros ECNs. Apesar de incomum, o S. lugdunensis é um patógeno com acentuada virulência que deve ser corretamente identificado, pois raramente poderá ser considerado contaminante quando isolado de sítios estéreis.Coagulase-negatives staphylococci (CNS are Gram-positives cocci commonly regarded as contaminants in clinical microbiology laboratories. Despite belonging to this group, Staphylococcus lugdunensis may cause complicated infections such as endocarditis, skin infections and soft tissue, osteomyelitis, among others. Apart from the formation of biofilms, it has pathogenic features similar to Staphylococcus aureus. It may be mistakenly identified as S. aureus when using rapid identification tests, such as clumping factor in slide coagulase or in agglutination latex tests. It is easily identified through available biochemical tests, such as the presence of ornithine decarboxylase and pyrrolidonyl arylamidase (PYR. It presents sensitivity to most antimicrobial agents. Furthermore, the presence of beta-lactamase and mecA gene should be routinely investigated by testing with chromogenic cephalosporin and cefoxitin susceptibility, respectively. It is convenient to highlight that the interpretative criteria used to evaluate cefoxitin sensitivity are the same recommended for S. aureus and different from those used for other CNS. Despite the fact it is atypical, S. lugdunensis is a virulent pathogen, which must be accurately identified insofar as it will rarely be deemed as a contaminant when isolated from sterile sites.

  11. Metodología para la oferta de servicio diferenciado por medio del análisis de costo de servir

    NARCIS (Netherlands)

    Mejia-Argueta, C.; Higuita-Salazar, C.; Hidalgo-Carvajal, D.A.

    2015-01-01

    The goal of the research is to generate profitable logistics and commercial strategies for customers. The methodology is a top-down procedure based in financial statements with higher detail (by channel, by product or by client), process mapping and activity-based-cost. The methodology has three

  12. Educar pela pesquisa na disciplina de seminário integrado: um olhar diferenciado sobre o ensino médio noturno

    Directory of Open Access Journals (Sweden)

    Gabriela Ribeiro Barbosa

    2017-06-01

    Full Text Available O artigo tem a intenção de apresentar uma proposta de trabalho pautada pelo educar pela pesquisa, realizada com alunos do terceiro ano noturno do ensino médio politécnico de uma Escola Estadual do município de Camaquã - RS. A iniciativa deu-se em virtude da vontade de prover estimulo a alunos, em sua maioria trabalhadores, os quais, cansados da jornada de trabalho, acabam perdendo interesse pelos estudos. A metodologia utilizada consistiu em propiciar um ambiente de pesquisa em sala em aula, com proposição de atividades alicerçadas nos pressupostos do educar pela pesquisa. Ao término do processo, a coleta de dados foi realizada a partir de questionários e entrevistas. Após a análise dos dados coletados, o estudo demonstrou expectativas e dificuldades que emergiram dos alunos nas práticas de pesquisa, bem como, a importância da proposta do educar pela pesquisa, propiciando aos alunos autonomia no processo de construção do conhecimento.

  13. Metodología para la oferta de servicio diferenciado por medio del análisis de costo de servir

    Directory of Open Access Journals (Sweden)

    Christopher Mejía-Argueta

    2015-10-01

    Full Text Available El objetivo de esta investigación es generar esquemas logísticos y comerciales rentables, para lo cual se construye una metodología que mide el costo de servir y se determina la rentabilidad a partir de los estados financieros, que va de lo general a lo específico, permitiendo cerrar las brechas identificadas en el análisis de costo de servir para mercados emergentes. La metodología consta de 3 fases y 12 pasos que alinean la estrategia, alcance, procesos y costeo de actividades con la segmentación de cuentas rentables, marginales y no rentables, para generar mayor rentabilidad. Como resultado se construyen herramientas que permiten priorizar a los clientes, así como definir la estrategia logística y comercial ideal para los objetos de estudio (cliente, producto, etc..

  14. UMA ANÁLISE DAS RELAÇÕES DE GÊNERO E CLASSE O PAPEL DIFERENCIADO DO SINDICALISMO RURAL EM ALAGOA GRANDE - PB

    Directory of Open Access Journals (Sweden)

    Emmy Lyra Duarte

    2012-01-01

    Full Text Available As relações de gênero são processos sociais que surgem, especificamente no Brasil, atreladas ao seu processo histórico colonial e patriarcal, no qual irão atribuir idéias e valores e, portanto, papéis sociais definidos, desiguais e hierarquizados para homens e para mulheres. Em torno disso, temos como ponto partida uma discussão do que seja essa diferenciação de gênero, qual a sua influência dentro da discussão de classe e seu papel exercido na formação do sindicalismo rural. 

  15. Análise da influência do acondicionamento diferenciado de lâminas para colpocitologia no resultado laboratorial

    Directory of Open Access Journals (Sweden)

    Camila Félix Américo

    2010-01-01

    Full Text Available En este estudio se evaluó la influencia de los tipos de embalaje de hojas de la citología en los resultados de los informes de laboratorio relativos al epitelio de muestra representativa, los cambios celulares benignos y atipia celular. Es un estudio descriptivo, cuantitativo, realizado entre abril y junio de 2008. Las participantes fueron 72 mujeres que se sometieron a exámenes preventivos para el cáncer cervical en un Centro de Parto Natural, en la ciudad de Fortaleza, Ceará, Brasil. De cada participante se recogieron dos muestras de frotis cervical vaginal: uno fue puesto al lado del de otras usuarias (caso, y uno solo (control, teniendo en cuenta las normas técnicas. Se realizó el criterio de "cegagem" de la lectura de las hojas. Los resultados de las dos hojas fueron comparados y fue visto incompatibilidades en los diferentes almacenamientos. Un desacuerdo fue de 58,3% en comparación con el epitelio de muestra representativa, y 48,2% en comparación con cambios celulares benignos. Los resultados sugieren nuevos estudios sobre las formas de almacenamiento, control de la intrasubjetividad del técnico responsable de leer y ordenar la recolección de las hojas de casos y control.

  16. Descompactación de suelos franco limosos en siembra directa: efectos sobre las propiedades edáficas y los cultivos Decompaction of no-tillage soils: effects on soil properties and crops

    Directory of Open Access Journals (Sweden)

    Carina R Álvarez

    2009-12-01

    Full Text Available La descompactación mecánica puede mejorar las condiciones físicas de suelos franco limosos que sufren compactación en siembra directa. Los objetivos del presente trabajo fueron: 1-evaluar la influencia de la descompactación mecánica (e.g. paratill o cultivie sobre algunas propiedades físicas y químicas de suelos manejados bajo siembra directa; 2- cuantificar el impacto de la descompactación sobre el rendimiento de maíz; 3-evaluar la perdurabilidad de la descompactación sobre variables físicas edáficas, desarrollo de raíces y rendimiento de los cultivos implantados luego del maíz. Durante la campaña 2006/07 se condujeron seis ensayos de campo en lotes de producción de maíz ubicados en la Pampa Ondulada. Se compararon parcelas apareadas en siembra directa continua (TEST vs. parcelas con pasaje de equipo descompactador a 30 cm (DESC. La resistencia a la penetración disminuyó 37 y 24% (p Mechanical decompaction may improve the physical properties of no-tillage silty loam soils. The aims of this study were to: 1- evaluate the influence of mechanical tilling (e.g. paratill or cultivie on soil physical (gravimetric water content, bulk density, penetration resistance and infiltration rate and chemical (nitrate content properties in no-tillage soils; 2- quantify the impact of soil decompaction on maize yield; and 3- evaluate the persistence of soil compaction alleviation on soil penetration resistance, root abundance and crop yields after maize. Six field experiments were conducted in no-tillage maize plots in the Rolling Pampa region. Paired plots were compared: continuous no tillage (TEST vs. soil compaction alleviation by deep tillage (DESC. Soil penetration resistance decreased by 37and 24 % (p < 0.05 at the 0-25 cm and 0-40 cm soil layers, respectively, and the soil infiltration rate increased (p= 0.07 from TEST to DESC at the V5-V6 maize growing stage. No deep tillage effect was observed on soil bulk density and nitrate content

  17. Identification of beef production farms in the Pampas and Campos area that stand out in economic and environmental performance

    NARCIS (Netherlands)

    Modernel, P.; Dogliotti, S.; Alvarez, S.; Corbeels, M.; Picasso, V.; Tittonell, P.; Rossing, W.A.H.

    2018-01-01

    Worldwide, native grasslands are being converted to non-native pastures and cropland. This process threatens local grassland biomes as well as the livelihoods of farm families that utilize these grasslands. In the Río de la Plata grasslands region meat production and multispecies native grasslands

  18. El bio-drenaje para el control del exceso hídrico en Pampa Arenosa, Buenos Aires, Argentina

    Directory of Open Access Journals (Sweden)

    Margarita M. Alconada Magliano

    2009-10-01

    Full Text Available La región noroeste de la provincia de Buenos Aires presenta periodos cíclicos de inundación y sequía. En 1970 se inicia el último ciclo húmedo registrado con grandes inundaciones, ascenso de la superficie freática e importantes pérdidas económicas en el sector agropecuario, un deterioro ambiental y problemas sociales. El bio-drenaje es una técnica que utiliza la vegetación para manejar el flujo de agua subterránea en un paisaje mediante la evapotranspiración, su aplicación ha tenido buen resultado en diversos países para el control de: inundación, salinización del suelo y elevación de la superficie freática. Se propone la plantación de especies forestales con ganadería vacuna (silvopastoreo en áreas de recarga y tránsito de sistemas de flujo local de agua subterránea, y áreas de tránsito de flujos intermedios, y suelos Udipsament típicos, Ustipsament típicos, Hapludol éntico, y Haplustol éntico. Se evalúa la viabilidad financiera mediante rentas anual forestal y de silvopastoreo. Pinus taeda, Eucalyptus viminalis, y E. tereticornis, dieron resultado positivo. Prosopis sp y E. camaldulensis, no presentan una alternativa financieramente viable. Prosopis sp podría considerarse por buen comportamiento en época seca, mejora de la ganadería y control del agua freática. La correcta elección de sitios a implantar resulta primordial, donde la calidad y cantidad del flujo de agua subterránea debe establecerse por técnicas científicamente probadas. De esta manera, se aborda la problemática ambiental de inundación del noroeste bonoaerense, bajo una visión holística de la geografía física y ambiental, al proponer la importancia de conocer cómo funciona el paisaje, y entender su dinámica, evolución, y relación con los medios físico, biológico y humano. Visión que se propone como previa a la recomendación de prácticas de manejo que puedan considerarse como sustentables en términos ambientales, económicos y sociales.

  19. Non-point source pollution of glyphosate and AMPA in a rural basin from the southeast Pampas, Argentina.

    Science.gov (United States)

    Okada, Elena; Pérez, Débora; De Gerónimo, Eduardo; Aparicio, Virginia; Massone, Héctor; Costa, José Luis

    2018-05-01

    We measured the occurrence and seasonal variations of glyphosate and its metabolite, aminomethylphosphonic acid (AMPA), in different environmental compartments within the limits of an agricultural basin. This topic is of high relevance since glyphosate is the most applied pesticide in agricultural systems worldwide. We were able to quantify the seasonal variations of glyphosate that result mainly from endo-drift inputs, that is, from direct spraying either onto genetically modified (GM) crops (i.e., soybean and maize) or onto weeds in no-till practices. We found that both glyphosate and AMPA accumulate in soil, but the metabolite accumulates to a greater extent due to its higher persistence. Knowing that glyphosate and AMPA were present in soils (> 93% of detection for both compounds), we aimed to study the dispersion to other environmental compartments (surface water, stream sediments, and groundwater), in order to establish the degree of non-point source pollution. Also, we assessed the relationship between the water-table depth and glyphosate and AMPA levels in groundwater. All of the studied compartments had variable levels of glyphosate and AMPA. The highest frequency of detections was found in the stream sediments samples (glyphosate 95%, AMPA 100%), followed by surface water (glyphosate 28%, AMPA 50%) and then groundwater (glyphosate 24%, AMPA 33%). Despite glyphosate being considered a molecule with low vertical mobility in soils, we found that its detection in groundwater was strongly associated with the month where glyphosate concentration in soil was the highest. However, we did not find a direct relation between groundwater table depth and glyphosate or AMPA detections. This is the first simultaneous study of glyphosate and AMPA seasonal variations in soil, groundwater, surface water, and sediments within a rural basin.

  20. Las expediciones a salinas: caravanas en la pampa colonial. El abastecimiento de sal a Buenos Aires (Siglos XVII y XVIII

    Directory of Open Access Journals (Sweden)

    Gabriel Darío Taruselli

    2005-01-01

    Full Text Available El abastecimiento de sal en cantidades sufi cientes fue una de las principales preocupaciones del Cabildo de Buenos Aires. Fue este un producto de importancia vital no sólo por su aplicación en las comidas cotidianas, sino también por su aplicación en la conservación de las carnes y los cueros. Las características de su uso y su obtención, aumentaron su valor, no sólo comercial sino también estratégico. El hallazgo de yacimientos locales permitió a los habitantes de Buenos Aires abastecerse mediante la práctica de expediciones periódicas que fueron promovidas por las autoridades capitulares, lo que les permitió ejercer un mayor control sobre dicha producción. Como la actividad requería una importante capacidad de transporte y de mano de obra, era una práctica aprovechada por muchos para emplearse en ella y para obtener benefi cios con el comercio que se generaba en la oportunidad. Esto convertía a las expediciones a salinas, organizadas por las autoridades de la ciudad, en grandes caravanas que se internaban en pleno territorio indí-gena, involucrando un amplio conjunto de actores sociales tanto de la ciudad como de la campaña y el mundo indígena

  1. Sediment and Phosphorus losses by Surface Runoff from a Catchment in the Humid Pampa Landscape, Argentina Republic

    Science.gov (United States)

    Méndez M., A.; Díaz E., L.; Lenzi M., L.; Lado, M.; Vidal-Vázquez, E.

    2015-04-01

    The estimation of sediment and phosphorus transfers from soil into watersheds as a result of agricultural activity is a key aspect for characterizing the sustainability of current land use systems. The objective of the present study was to quantify the temporal evolution of suspended sediment and dissolved phosphorus losses from the upper basin of the Gualeguaychú River. The studied catchment has an area of 483 Km2 and is located in the Entre Ríos province, Argentina Republic. The climate is subtropical humid with average annual rainfall of 1200 mm. Soils are characterized by very low infiltration rates. Land use was assessed by remote sensing and GIS tools, and consists of: 31% abandoned rice fields, 20% naturalized fields, 20% soybean (second cycle), 10% soybean (first cycle), 7% rice, 4% Pasture, and the remaining 7% is devoted to civil and road works, native forests and other crops. Low soil infiltration capacity, together with landscape geomorphological traits of the studied landscape and zonal rainfall regime, typically originates periods with high surface runoff volumes, mainly in autumn, spring and summer months. The study was conducted during a period of eight years. Instantaneous water flow measurements (discharge) were estimated in a control section of Gualeguaychú River from hydrometer reading and the rating curve of height-flow. In addition, 134 water samples of 2000 cm3 were collected during the study period to analyze the concentration of suspended sediments and dissolved phosphorus. The instantaneous flow was estimated with the hydrometer reading and the application of curve of height - flow. The discharge range was from 0.14 to 128 m3/sec, indicating a high variability in the response of the catchment to seasonal rainfall. On average suspended sediment and dissolved phosphorus losses of the experimental catchment were 1.42 Mg and 0.335 Kg per hectare/year, respectively. It was also shown that few events of high rainfall that generate excess runoff were responsible for the most of recorded losses of sediment and phosphorus. Moreover, the highest exportation of sediments and phosphorus from soil to streamflow occurred in the spring and summer period. The daily losses of phosphorus or sediments were mainly explained by the amount of precipitation accumulated during the five days prior to sampling, as shown by regression analysis, and a higher coefficient of determination was obtained for samples extracted during the summer season. This response mainly has been demonstrated to be produced in periods with higher amounts of precipitation equal or greater than 35 mm arising in this season, which are characteristic for summer storms with high rain intensities, and therefore greater erosive power.

  2. El contratismo de servicios de maquinaria en la producción agropecuaria de la pampa argentina

    OpenAIRE

    Garcia, Mabel; Lombardo, Patricia

    2013-01-01

    El contratismo de servicios de maquinaria ha desempeñado históricamente un rol significativo en el proceso de expansión e intensificación de la actividad agrícola en la región pampeana. El objetivo de este artículo es analizar la evolución del contratismo de servicios de maquinaria en el período 1988 y 2002, así como sus principales características. Para la consecución de este objetivo se han utilizado reprocesamientos especiales de los Censos Nacionales Agropecuarios (CNA, 1988 y 2002), para...

  3. The role of psychological factors in the adoption of improved natural grassland by Brazilian cattle farmers in Biome Pampa

    NARCIS (Netherlands)

    Rossi Borges, J.A.

    2015-01-01

    The objective of the research was to explore factors determining cattle farmers' intention to adopt improved natural grassland in Brazil. The research was carried out in the state of Rio Grande do Sul, in the south of Brazil.

  4. Variables Associated with Utilization of a Centralized Medical Post in the Andean Community of Pampas Grande, Peru

    Science.gov (United States)

    Merry, Stephen P.; Rohrer, James E.; Thacher, Thomas D.; Summers, Matthew R.; Alpern, Jonathan D.; Contino, Robert W.

    2012-01-01

    Context: Integral to the location of health resources is the distance decay of utilization observed in a population. In rural Peru, a nongovernmental organization planning to increase the availability of health services needed this information. Purpose: To determine variables associated with utilization of a central medical clinic and determine…

  5. Landscape genetics in the subterranean rodent Ctenomys "chasiquensis" associated with highly disturbed habitats from the southeastern Pampas region, Argentina.

    Science.gov (United States)

    Mora, Matías Sebastián; Mapelli, Fernando J; López, Aldana; Gómez Fernández, María Jimena; Mirol, Patricia M; Kittlein, Marcelo J

    2017-12-01

    Studies of genetic differentiation in fragmented environments help us to identify those landscape features that most affect gene flow and dispersal patterns. Particularly, the assessment of the relative significance of intrinsic biological and environmental factors affecting the genetic structure of populations becomes crucial. In this work, we assess the current dispersal patterns and population structure of Ctenomys "chasiquensis", a vulnerable and endemic subterranean rodent distributed on a small area in Central Argentina, using 9 polymorphic microsatellite loci. We use landscape genetics approaches to assess the relationship between genetic connectivity among populations and environmental attributes. Our analyses show that populations of C. "chasiquensis" are moderately to highly structured at a regional level. This pattern is most likely the outcome of substantial gene flow on the more homogeneous sand dune habitat of the Northwest of its distributional range, in conjunction with an important degree of isolation of eastern and southwestern populations, where the optimal habitat is surrounded by a highly fragmented landscape. Landscape genetics analysis suggests that habitat quality and longitude were the environmental factors most strongly associated with genetic differentiation/uniqueness of populations. In conclusion, our results indicate an important genetic structure in this species, even at a small spatial scale, suggesting that contemporary habitat fragmentation increases population differentiation.

  6. The hydrological and environmental evolution of shallow Lake Melincué, central Argentinean Pampas, during the last millennium

    Science.gov (United States)

    Guerra, Lucía; Piovano, Eduardo L.; Córdoba, Francisco E.; Sylvestre, Florence; Damatto, Sandra

    2015-10-01

    Lake Melincué, located in the central Pampean Plains of Argentina, is a shallow (∼4 m), subsaline lake (TDS > 2000 ppm), highly sensitive to hydrological changes. The modern shallow lake system is composed of: (a) a supralittoral area, which includes a narrow mudflat, a vegetated mudflat and wetlands subenvironments; and (b) the main water body, comprising lacustrine marginal and inner areas. The development and extension of these subenvironments are strongly conditioned upon lake surface fluctuations. Past environmental changes were reconstructed through sedimentological, physical and geochemical proxy analyses of two short sedimentary cores (∼127 cm). Well-constrained 210Pb ages profiles were modeled and radiocarbon chronologies were determined, covering a period from ∼AD 800 to the present. The analyzed sedimentary cores from Lake Melincué allowed for the reconstruction of past hydrological scenarios and associated environmental variability, ranging from extremely low lake levels during dry phases to pronounced highstands at wet periods. The paleohydrological reconstruction revealed very shallow conditions in the period between AD 806 and AD 1880, which was registered by massive deposits with low organic matter. Relatively wetter phases disrupting this dry period were represented by organic matter increases. A major wet phase was registered by AD 1454, after the end of the Medieval Climate Anomaly. A subsequent abrupt shift from this wet phase to drier conditions could be matching the transition between the end of the Medieval Climatic Anomaly and the beginning of the Little Ice Age. The occurrence of sedimentary hiatuses between AD 1492 and AD 1880 in Melincué sequence could correspond to intensive droughts during the Little Ice Age. After AD 1880, banded and laminated, autochthonous, organic matter-rich sediments registered an important lacustrine transgression and the onset of a permanent shallow lake, corresponding to the beginning of the current warm period. The uppermost recent fine-grained, low salinity, organic sediments represent a lake transgression occurred in the 1970s, coeval with a general increase in precipitation across southeastern South America. This transgression is registered regionally in other Pampean lakes and in the 20th century instrumental records of Lake Melincué. This paleoenvironmental reconstruction provides a new high-resolution record that registers striking hydroclimatic changes occurred at a regional scale across the Pampean Plains during the last millennium and it contributes to understand the past climatic history in southeastern South America.

  7. Pampa Solar: un proyecto multidisciplinario para la construcción de un vehículo solar

    Directory of Open Access Journals (Sweden)

    Silvano Rossi

    2014-01-01

    Full Text Available Los sistemas basados en energías limpias y de emisión cero como alternativas de movilidad sustentable aplicadas al transporte urbano son hoy una necesidad y justifican el objetivo de disponer de un vehículo solar como prototipo experimental. Así, la iniciativa de un grupo de trabajo constituido por docentes, estudiantes y personal no docente se focalizó en la construcción de un vehículo híbrido experimental motivado por una competencia latinoamericana de autos solares, en la que se validó su desempeño luego de su participación. El prototipo construido fue galardonado con el premio al uso más eficiente de energía solar. En el trabajo se presentan los aspectos constructivos del vehículo y resultados experimentales obtenidos durante la competición.

  8. Diversification in the South American Pampas: the genetic and morphological variation of the widespread Petunia axillaris complex (Solanaceae).

    Science.gov (United States)

    Turchetto, Caroline; Fagundes, Nelson J R; Segatto, Ana L A; Kuhlemeier, Cris; Solís Neffa, Viviana G; Speranza, Pablo R; Bonatto, Sandro L; Freitas, Loreta B

    2014-02-01

    Understanding the spatiotemporal distribution of genetic variation and the ways in which this distribution is connected to the ecological context of natural populations is fundamental for understanding the nature and mode of intraspecific and, ultimately, interspecific differentiation. The Petunia axillaris complex is endemic to the grasslands of southern South America and includes three subspecies: P. a. axillaris, P. a. parodii and P. a. subandina. These subspecies are traditionally delimited based on both geography and floral morphology, although the latter is highly variable. Here, we determined the patterns of genetic (nuclear and cpDNA), morphological and ecological (bioclimatic) variation of a large number of P. axillaris populations and found that they are mostly coincident with subspecies delimitation. The nuclear data suggest that the subspecies are likely independent evolutionary units, and their morphological differences may be associated with local adaptations to diverse climatic and/or edaphic conditions and population isolation. The demographic dynamics over time estimated by skyline plot analyses showed different patterns for each subspecies in the last 100 000 years, which is compatible with a divergence time between 35 000 and 107 000 years ago between P. a. axillaris and P. a. parodii, as estimated with the IMa program. Coalescent simulation tests using Approximate Bayesian Computation do not support previous suggestions of extensive gene flow between P. a. axillaris and P. a. parodii in their contact zone. © 2013 John Wiley & Sons Ltd.

  9. RELACIÓN BIOMASA DE RAÍZ/BIOMASA TOTAL DE SOJA (Glycine max EN DOS SISTEMAS DE LABRANZA

    Directory of Open Access Journals (Sweden)

    Mónica Beatriz Barrios

    2014-07-01

    Full Text Available La soja es el principal cultivo en Argentina debido a su adaptación a los suelos, la incorporación de tecnología con el empleo de la siembra directa y el precio del mercado internacional. Las propiedades físicas, químicas y biológicas de cada suelo se ven modificadas por el tipo de sistema de laboreo empleado. El entorno generado por la labranza altera el crecimiento y el equilibrio funcional de los cultivos herbáceos. En el año 2006, se instaló un ensayo en el Partido de Ezeiza (Pampa Ondulada, con el objetivo de evaluar los efectos del sistema de laboreo en el equilibrio funcional entre biomasa de raíces/biomasa total en soja (Glycine max durante la campaña 2012/2013. Se utilizó un diseño de bloques completos al azar con dos tratamientos que consistieron en: labranza convencional (LC y siembra directa (SD, con cuatro repeticiones. Se midió: peso de biomasa aérea, área foliar, rendimiento en grano, peso de raíces de 0-10 y 10-20 cm de profundidad, y se calculó biomasa total y la relación biomasa de raíces/biomasa total. El peso de raíces se determinó con el método del cilindro, el área foliar con el paquete estadístico Iproplus y el rendimiento con el cuadrado de corte. Los datos obtenidos fueron sometidos a análisis de varianza y las medias de los tratamientos fueron comparadas según Tukey (P < 0.05. El efecto del sistema de labranza generó diferentes respuestas en función de la variable evaluada y la fecha de muestreo. LC resultó significativamente superior (P < 0.05 respecto a SD en biomasa total y biomasa aérea en las etapas fenológicas R3 y R5; biomasa de raíces en R1 y R3; IAF en R2, R3 y R5. El rendimiento en grano fue mayor en LC respecto de SD, sin embargo el sistema de labranza no afectó la relación biomasa de raíz/biomasa total.

  10. Eficiência térmica de telhas onduladas de fibrocimento aplicadas em abrigos individuais para bezerros expostos ao sol e à sombra Thermal efficiency of fiber cement corrugated sheets applied to individual housing for calves exposed to sun and shade

    Directory of Open Access Journals (Sweden)

    Juliano Fiorelli

    2012-01-01

    Full Text Available Este trabalho apresenta um estudo da eficiência térmica de coberturas de bezerreiros individuais expostas ao sol e à sombra, por meio de termografia infravermelha, temperatura interna e índices de conforto térmico. Foram avaliados quatro bezerreiros, três expostos ao sol, a saber: (i cobertos com telhas de fibrocimento sem amianto - pintadas de branco, (ii sem pintura e (iii com sombrite posicionado internamente aos bezerreiros, à distância de 0,10m da face inferior da telha. O quarto bezerreiro foi instalado em área sombreada e coberto com telhas de fibrocimento sem pintura. As coletas de dados foram realizadas durante 21 dias, nos horários das 11h00min, 14h00min e 17h00min. Os resultados mostraram variações significativas na temperatura de superfície das coberturas e nos índices de conforto térmico, entre os tratamentos expostos ao sol e à sombra, para todos os horários avaliados. As imagens termográficas infravermelhas mostraram-se eficientes para melhor compreensão dos processos de transferência de calor da cobertura para o interior das instalações.This research presents a study of roof thermal efficiency in individual housing for calves exposed to sun and shade through infrared thermography, internal temperature and thermal comfort indexes. Four different individual housing for calves covered with asbestos-free fiber-cement corrugated sheets were evaluated. Three of them were directly exposed to the sun: (i corrugated sheets painted white in the external surface, (ii corrugated sheets without painting and (iii with screen shade fabric installed 0.10m under de internal surface of the corrugated sheet. The fourth individual housing was installed in the shade area and covered with unpainted corrugated fiber-cement sheets. The analysis was taken for 21 days at 11h00min, 14h00min and 17h00min. The results indicate significant variations in the roofing surface temperature and thermal comfort indexes among the treatments exposed to the sun and shade, for all the evaluations during the day. The infrared thermography images were effective for better understanding the heat transfer processes from the roof to the internal environment of the housing.

  11. PET imaging in differentiated thyroid cancer: where does it fit and how do we use it?; Imagem por PET no cancer diferenciado de tiroide: onde ele se encaixa e como usa-lo?

    Energy Technology Data Exchange (ETDEWEB)

    Hall, Nathan C. [The Ohio State University, Columbus, OH (United States). Div. of Nuclear Medicine; Kloos, Richard T. [The Ohio State University, Columbus, OH (United States). Diabetes and Metabolism and Nuclear Medicine]. E-mail: richard.kloos@osumc.edu

    2007-07-15

    Positron emission tomography (PET) is a rapidly evolving imaging modality that has gained widespread acceptance in oncology, with several radionuclides applicable to thyroid cancer. Thyroid cancer patients have been studied most commonly using {sup 18}F-Fluorodeoxyglucose (FDG)-PET, with perhaps the greatest utility being the potential localization of tumor in differentiated thyroid cancer (DTC) patients who are radioiodine whole body scan (WBS) negative and thyroglobulin (Tg) positive. Also of value is the identification of patients unlikely to benefit from additional {sup 131}I therapy and identification of patients at highest risk of disease-specific mortality, which may prompt more aggressive therapy or enrollment in clinical trials. Emerging data suggest that PET/CT fusion studies provide increased accuracy and modify the treatment plan in a significant number of DTC cases when compared to PET images alone. However, studies documenting improvements in survival and tumor recurrence attributable to FDG-PET imaging in thyroid cancer patients are lacking. Specific case examples of thyroid cancer patients who appear to have benefited from FDG-PET imaging do exist, while less data are available in the setting of anaplastic or medullary thyroid carcinoma. This article reviews the utility and limitations of FDG-PET in DTC management, and offers practical recommendations. (author)

  12. Gamma-spectrometric surveys in differentiated granites. II: the Joaquim Murtinho Granite in the Cunhaporanga Granitic Complex, Parana, SE Brazil; Levantamentos gamaespectrometricos em granitos diferenciados. II: O exemplo do Granito Joaquim Murtinho, Complexo Granitico Cunhaporanga, Parana

    Energy Technology Data Exchange (ETDEWEB)

    Ferreira, Francisco Jose Fonseca [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Dept. de Geologia. Lab. de Pesquisas em Geofisica Aplicada; Fruchting, Allan [Votorantim Metais, Sao Paulo, SP (Brazil)], e-mail: allan.fruchting@vmetais.com.br; Guimaraes, Gilson Burigo [Universidade Estadual de Ponta Grossa (UEPG), PR (Brazil). Dept. de Geociencias], e-mail: gburigo@ig.com.br; Alves, Luizemara Soares [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)], e-mail: luizemara@petrobras.com.br; Martin, Victor Miguel Oliveira; Ulbrich, Horstpeter Herberto Gustavo Jose [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Geociencias. Dept. de Mineralogia e Geotectonica], e-mail: vicmartin6@ig.com.br, e-mail: hulbrich@usp.br

    2009-07-01

    Detailed mapping at the NW corner of the large Neo proterozoic Cunhaporanga Granitic Complex (CGC), Parana state, SE Brazil, redefined the Joaquim Murtinho Granite (JMG), a late intrusion in CGC with an exposed area of about 10 km{sup 2}, made up mainly by evolved 'alaskites' (alkali-feldspar leuco granites). This unit is in tectonic contact with the Neoproterozoic-Eocambrian volcano-sedimentary Castro Group, to the W, and is intrusive into other less evolved granitic units of the CGC to the E. Petrographically, JMG shows mainly mesoperthite and quartz, with subordinate amounts of altered micas and some accessory phases, mainly zircon. The equi to inequigranular granites are usually deformed with cataclastic textures, are often brecciated, and may have miarolitic structures. Formation of late albite, sericite, carbonate and hematite was caused by deuteric and hydrothermal alteration. A gamma-ray spectrometric survey at 231 stations which measured total counts (TC), Ueq K%, eU ppm and eTh ppm was used to construct several direct and derived maps. Compared to neighboring units the JMG has significant anomalies, especially in the TC, %K, eTh and eU maps, although the differences are less obvious in some derived maps. These evolved granites are enriched in these three elements. Geochemical behavior of K, Th and U is used to analyse the results observed in maps. Enhanced weathering under a subtropical climate with moderate to high average temperatures and heavy rainfall affects mainly feldspars and biotite, and may also destabilize most U and Th-bearing accessory phases. Th is most likely retained in restite minerals in soils, being relatively immobile, while part of U may migrate as uranyl ion in oxidizing media. K is especially affected by feldspar alteration to K-free clays (mainly kaolinite), and may be completely leached. Gamma-ray spectrometric methods are valid tools to study facies in granitic rocks, especially in those that are enriched in K, Th and U. (author)

  13. Los colegios diferenciados por sexo en Estados Unidos: constitucionalidad y actualidad de una tendencia imparable = Single-sex education in the United States: constitutionality and current developments of an unstoppable trend

    Directory of Open Access Journals (Sweden)

    María Calvo Charro

    2013-01-01

    Full Text Available En los últimos años Estados Unidos ha experimentado el resurgir de la educación diferenciada por sexo con el apoyo de políticos de muy diferentes tendencias, educadores, padres, ciertos sectores feministas, así como asociaciones de defensa de los derechos de los afroamericanos y otras minorías. Esta tendencia, lenta pero implacable, entre los colegios públicos, como consecuencia de los excelentes resultados obtenidos, ha generado un encendido debate en ámbitos académicos, legales y políticos. La legislación norteamericana federal los motiva, incentiva y apoya, con ciertas condiciones relativas a garantizar la igualdad de oportunidades entre los sexos y la libertad de elección de los padres del modelo educativo que consideren apropiado para sus hijos. No obstante, la American Civil Liberties Union sigue mostrando su abierta oposición a estos centros educativos a los que considera discriminatorios. En este marco, hasta el momento, el Tribunal Supremo no ha encontrado en estos centros tacha alguna de inconstitucionalidad. In recent years the U.S. has experienced a resurgence of single-sex education with the support of politicians of very different tendencies, educators, parents, some feminist sectors and associations defending the rights of African Americans and other minorities. This trend, slowly but relentlessly, including public schools, has generated a heated debate in academic, legal and political fields. The federal U.S. legislation motivates, encourages and supports, with certain conditions relating to ensuring equality of opportunity between the sexes and freedom of parental choice of educational model they consider appropriate for their children. However, the American Civil Liberties Union continues to show his outspoken opposition to these schools to which they considered discriminatory. In this framework, so far, the Supreme Court has found these centers absolutely constitutional.

  14. Evaluación de la intervención psicooncológica mediante Counselling en pacientes con cáncer diferenciado de tiroides en tratamiento con radioyodo.

    OpenAIRE

    Javaloyes Bernácer, Nuria

    2017-01-01

    El hecho de recibir un diagnóstico de cáncer y el tratamiento del mismo causan habitualmente una profunda herida emocional a las personas que lo padecen y a su familia. Por esto, el paciente diagnosticado de cáncer debe ser tratado de forma que mantenga la mejor calidad de vida (CV) y bienestar psicológico posibles, cuidando de manera especial todos los factores que originen problemas emocionales (ansiedad y/o depresión) y alteraciones de la vida social, laboral y familiar. Los pacientes ...

  15. A Ética do cuidado na educação infantil: um olhar diferenciado para a formação educacional integral da criança.

    OpenAIRE

    Marilan Negrão Borges Luz Gomes

    2011-01-01

    Uma reflexão sobre a formação educacional integral da criança na Educação Infantil relacionada à necessidade da prática da ética do cuidado no fazer pedagógico nas instituições de Educação Infantil visualizando a formação de um adulto no futuro com construção ética em seu agir pessoal e social. O primeiro capítulo traça um caminho até a ética do cuidado. Para tanto, conceitua ética, distingue ética de moral e apresenta a construção ética e moral da ...

  16. Urbanización turística y ocupación del suelo en la península de Hicacos (Varadero, Cuba: Comportamientos diferenciados entre los espacios de uso público y privado

    Directory of Open Access Journals (Sweden)

    Ricardo Remond-Roa

    2015-09-01

    Full Text Available En la península de Hicacos se localiza Varadero, el principal polo turístico de Cuba y uno de los más antiguos e importantes del Caribe. El desarrollo hotelero del enclave, la especificidad del sistema cubano, así como una larga trayectoria en ordenación territorial, introducen una serie de particularidades respecto a otros destinos similares de sol y playa. Entre estos destacan los relativos a la ocupación y los usos del suelo. Los análisis y las conclusiones difieren según se trate de parcelas hoteleras o zona costera de uso público, por un lado, y el año de urbanización del territorio y la construcción del hotel, por otro. En este sentido, la aprobación de la Ley de Gestión de la Zona Costera de 1997 representa un hito de especial significación. Para estudiar estos procesos se emplearon herramientas de representación y análisis espacial presente en los Sistemas de Información Geográfica e imágenes de satélite de muy alta resolución espacial.

  17. Produção e qualidade de ovos em reprodutoras de frangos de corte com horário de arraçoamento diferenciado Performance and egg quality traits of female broiler breeders submitted to different feeding schedules

    Directory of Open Access Journals (Sweden)

    Valdir Silveira de Avila

    2005-08-01

    Full Text Available Foi estudada a influência de quatro horários de arraçoamento (único, às 6h30; dual [50% às 6h30 e 50% às 15h30]; único, às 11h; e único, às 15h30 sobre a produção e qualidade dos ovos de reprodutoras de corte, alocados ao acaso, em 48 boxes, com 27 fêmeas Arbor Acres e três machos cada, com 12 repetições. As exigências nutricionais e de manejo atenderam as recomendações da linhagem. Estudaram-se as produções de ovos total (PTOTAL, de ninho (PNINHO, limpos (PLIMPO e quebrados (PQUEMO em seis coletas (6h30, 9h, 11h, 13h30, 15h30 e 17h30; peso médio (PESOVO e gravidade específica do ovo (GE agrupados em três coletas (9h, 13h30 e 17h30. Foram utilizados a análise de variância, o teste T de Student para comparação das médias referentes a tratamento e coleta, e a análise de regressão polinomial para idade. Houve efeito do horário de arraçoamento e coleta para todas as variáveis, exceto para PQUEMO, em que não foi evidenciado efeito do horário de arraçoamento. Para os arraçoamentos às 6h30 e dual, o maior percentual de ovos produzido (22,78 ± 0,36% e 20,26 ± 0,33%, respectivamente ocorreu na coleta das 9h, enquanto, para os arraçoamentos às 11h e às 15h30, ocorreu na coleta das 13h30 (20,35 ± 0,39% e 19,25 ± 0,38%, respectivamente. As reprodutoras do sistema dual de arraçoamento e aquelas arraçoadas às 15h30 tiveram PESOVO de 71,0 ± 0,3 g, que, em qualquer coleta, foi, no mínimo, igual aos demais. As médias de GE foram maiores para as aves arraçoadas às 11h (1,0788 ± 0,0002 e às 15h30 (1,0799 ± 0,0002 que as demais. Ovos de reprodutoras mais velhas e aqueles coletados nas primeiras horas do dia foram mais pesados e apresentaram cascas mais finas. O sistema de arraçoamento dual apresentou-se como a melhor alternativa na substituição do sistema de alimentação única às 6h30.Four feeding schedule were investigated for broiler breeders: at 6:30 am; 50% feeding at 6:30 am and 50% at 3:30 pm (dual; at 11:00 am, and at 3:30 pm. Arbor Acres breeders were randomly assigned to 48 boxes, with 12 replicates of 27 females and three males each. The nutritional levels and management procedures were those recommended for strain. The variables studied were: total egg production, nest, clean and broken egg production, in six collections (6:30 am, 9:00 am, 11:00 am, 1:30 pm, 3:30 pm and 5:30 pm; egg weight and egg specific gravity, grouped in three collections (9:00 am, 1:30 pm and 5:30 pm. Analysis of variance was used. Means were compared using Student t test for traits and collection and polynomial regression analysis for age. The collection and feeding schedule effects were significant for all traits, except for broken eggs, in which feeding schedule was not significant. The maximum egg production was obtained at 9:00 am for feeding schedule at 6:30 am (22.78 ± 0.36% and dual (20.26 ± 0.33%, and at 1:30 pm for feeding schedule at 11:00 am (20.35 ± 0.39% and at 3:30 pm (19.25 ± 0.38%. Female broiler breeders under the dual and at 3:30 pm feeding schedule showed egg weight of 71.0 ± 0.3 g, which was at least equal to the other feeding schedule in any collection. The egg specific gravity for feeding schedule at 11:00 am (1.0788 ± 2 and 3:30 pm (1.0799 ± 2 were higher than the other feeding schedule. Eggs from older female broiler breeders and eggs collected in the first hours of the day were heavier and had thinner eggshell than those from younger females and eggs collected later in the day. The dual feeding schedule could be an alternative to feeding schedule at 6:30.

  18. Drosophilidae (Diptera associated to fungi: differential use of resources in anthropic and Atlantic Rain Forest areas Drosophilidae (Diptera associados a fungos: uso diferenciado de recursos em áreas antrópicas e de Mata Atlântica

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    Marco S Gottschalk

    2009-12-01

    Full Text Available This study investigates the Drosophilidae species associated to fruiting bodies of fungi in forested and anthropized environments of the Atlantic Rain Forest Biome, in south and southeastern Brazil. We collected samples of imagoes flying over and emerging from fruiting bodies of species of five fungi families, in six collection sites. We obtained 18 samples, from which emerged 910 drosophilids of 31 species from the genera Drosophila Fallen, 1823, Hirtodrosophila Duda, 1923, Leucophenga Mik, 1886, Mycodrosophila Oldenberg, 1914, Scaptomyza Hardy, 1849, Zaprionus Coquillett, 1901 and Zygothrica Wiedemann, 1830. The Drosophila species collected on fungi, as well as Zaprionus indianus Gupta, 1970, had previously been recorded colonizing fruits, demonstrating their versatility in resource use. Most of these species belong to the immigrans-tripunctata radiation of Drosophila. Our records expands the mycophagous habit (feeding or breeding on fungi to almost all species groups of this radiation in the Neotropical region, even those supposed to be exclusively frugivorous. Assemblages associated to fungi of forested areas were more heterogeneous in terms of species composition, while those associated to fungi of anthropized areas were more homogeneous. The drosophilids from anthropized areas were also more versatile in resource use.Foi realizado um estudo das espécies de Drosophilidae associadas aos corpos de frutificação de fungos em ambientes florestais e antrópicos no Bioma Mata Atlântica, no sul e sudeste do Brasil. Foram realizadas coletas de adultos sobrevoando e emergindo de corpos de frutificação de espécies de fungos de cinco famílias, em seis pontos de coleta. Foram obtidas 18 amostras, onde foram coletados 910 indivíduos de 31 espécies, pertencentes aos gêneros Drosophila Fallen, 1823, Hirtodrosophila Duda, 1923, Leucophenga Mik, 1886, Mycodrosophila Oldenberg, 1914, Scaptomyza Hardy, 1849, Zaprionus Coquillett, 1901 e Zygothrica Wiedemann, 1830. As espécies de Drosophila coletadas, assim como Zaprionus indianus Gupta, 1970, já haviam sido registradas em frutos, evidenciando sua versatilidade na utilização dos recursos. A maioria destas espécies pertence à radiação immigrans-tripunctata de Drosophila. Em espécies desta radiação que habitam regiões temperadas, a micofagia é amplamente difundida; nossos registros (de sítios de alimentação e oviposição em fungos expandem este hábito para quase todos os grupos de espécies desta radiação na região Neotropical, mesmo aquelas que se supunham ser exclusivamente frugívoras. As assembléias colonizadoras dos corpos de frutificação variaram entre as espécies de fungos e com o tipo de ambiente em que eles se desenvolviam, onde as espécies de drosofilídeos generalistas utilizam os fungos em ambientes mais degradados.

  19. Comportamento celular e resposta antioxidante diferenciados de Saccharomyces cerevisiae e de Saccharomyces chevalieri ao metavanadato de amónio Different cellular behaviour and antioxidant response of Saccharomyces cerevisiae and Saccharomyces chevalieri growing in presence of ammonium metavanadate

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    R. Ferreira

    2007-01-01

    Full Text Available A fermentação do vinho é um processo microbiológico complexo que requere a presença de leveduras adaptadas a condições de stresse. No ambiente celular de organismos aeróbios ocorrem naturalmente espécies reactivas de oxigénio (ROS como subprodutos da respiração mitocondrial. A elevada reactividade destas espécies químicas pode gerar danos moleculares que, em alguns casos, levam à morte celular. Em condições fisiológicas normais ou como resposta ao stresse oxidativo, a célula pode desencadear respostas adaptativas que envolvem mecanismos antioxidantes como os enzimas glutationo redutase (GR; EC 1.6.4.2 e catalases T (CAT T; EC 1.11.1.6 e A (CAT A; EC 1.11.1.6. O vanádio, um metal pesado presente em alguns fitofármacos, pode também com portar-se como um gerador de ROS, alterando o estado redox intracelular e exercendo efeitos nocivos em leveduras expostas a quantidade excessiva deste elemento. O principal objectivo deste trabalho foi comparar o efeito do metavanadato de amónio (NH4VO3, um sal pentavalente de vanádio, na viabilidade celular e nas actividades enzimáticas GR, CAT T e CAT A das leveduras vínicas Saccharomyces cerevisiae UE-ME3 e Saccharomyces chevalieri UE-ME1. Os resultados obtidos mostram que S. chevalieri UE-ME1 revelou menor tolerância ao NH4VO3 do que S. cerevisiae UE-ME3, uma vez que culturas de S. chevalieri não sobreviveram para valores de concentração do sal de vanádio superiores a 7,5 mM enquanto que células de S. cerevisiae mantiveram-se viáveis em presença de metavanadato de amónio 75 mM. As actividades enzimáticas estudadas apresentaram em S. chevalieri valores muito inferiores aos que foram determinados em S. cerevisiae embora em ambas as espécies de levedura o NH4VO3 pareça comportarse como um indutor de stresse oxidativo ao provocar um decréscimo significativo da actividade GR (PThe fermentation of wine is a complex microbiological process which requires yeast adaptation to stress conditions. In the cellular environment of aerobic organisms naturally reactive oxygen species (ROS occurs as by-products of mitochondrial respiration. The higher reactivity of these chemical species could cause molecular damages that in several cases induce cellular death. In common physiological conditions or as response to oxidative stress, the cell can generate adapted responses which involve antioxidants mechanisms as glutathione reductase (GR; EC 1.6.4.2 and catalase T (CAT T; EC 1.11.1.6 and A (CAT A; EC 1.11.1.6 enzymes. Vanadium, a heavy metal present in several pesticides could generate ROS changing the intracellular redox state and cause deleterious effects in yeasts exposed to higher levels of this element. The main objective of this work was to compare the effects of ammonium metavanadate (NH4VO3, a pentavalent salt of vanadium on cellular viability and GR, CAT T and CAT A activities of wine yeast Saccharomyces cerevisiae UE-ME3 and Saccharomyces chevalieri UE-ME1. The results obtained show that S. chevalieri UE-ME1 has lower tolerance to NH4VO3 than S. cerevisiae UE-ME3, since S. chevalieri cultures do not survive to concentration values of ammonium metavanadate higher than 7,5 mM, whereas S. cerevisiae cells are still viable in the presence of 75 mM. S. chevalieri has an enzymatic activity lower than S. cerevisiae, although for both yeast species NH4VO3 could behave as oxidative stress inductor, causing a significant decrease of GR activity (P<0,01 and a significant increase of CAT A activity (P<0,01. The results show also an increase of CAT T activity in both yeast species, which can be interpreted as a protective response to oxidative stress. Differences on response to amonium metavanadate by both species of Saccharomyces could be partially justified by more efficient antioxidant systems in S. cerevisiae UE-ME3.

  20. Aspiraciones y proyectos de futuro de estudiantes de enseñanza técnica-profesional: ¿Es pertinente un sistema diferenciado en la enseñanza media?

    OpenAIRE

    Sepúlveda V, Leandro; Valdebenito I, María José

    2014-01-01

    Este artículo analiza las aspiraciones y expectativas de futuro de los estudiantes de educación técnica-profesional del último nivel de enseñanza secundaria en una muestra representativa de centros educacionales de la ciudad de Santiago. La enseñanza técnica de nivel medio ha sido definida como una alternativa de ingreso temprano al mundo laboral de los estudiantes que finalizan sus estudios secundarios. Sin embargo, en los últimos años se observa un incremento de la participación de sus egre...

  1. Usefulness of recombinant human TSH-aided radioiodine doses administered in patients with differentiated thyroid carcinoma Administración de dosis terapéuticas de radioyodo luego de TSH recombinante en pacientes con carcinoma diferenciado de tiroides

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    Fabián Pitoia

    2006-04-01

    Full Text Available The published studies confirming the safety and efficacy of rhTSH for diagnostic purposes have led to an increased interest in its use for preparation for radioiodine (RI dose administration in patients with recurrent or persistent differentiated thyroid carcinoma (DTC. In order to establish the efficacy of RI therapy after rhTSH, we have reviewed 39 rhTSH-aided radioiodine treatment in a series of 28 DTC patients. Patients were divided into two groups: GI (n=17, with previous thyroid bed uptake and undetectable thyroglobulin (Tg levels under levothyroxine treatment and GII (n=11, with proven metastatic local or distant disease. Median follow-up after the first rhTSH-aided radioiodine treatment was 32 ± 13 months (range 8 to 54 months. Sixteen patients (94% in GI were rendered disease free and one patient was shown to have persistent disease. In GII, the post therapy whole body scan showed pathological uptakes in all cases: in four patients in lungs, in four in mediastinum and in three in lateral neck. In two patients with mediastinum uptake, Tg levels were undetectable after rhTSH. In the follow-up, two patients with lateral neck uptake were rendered disease free, four patients died (three due to thyroid cancer and five out of the remaining patients have persistent disease. In conclusion, rhTSH aided therapy was helpful to eliminate normal thyroid bed remnants in 16/17 (94% patients (GI. rhTSH stimulated Tg was undetectable in two patients with mediastinal metastasis. We believe that rhTSH is a good alternative to levothyroxine withdrawal for the treatment of DTC with radioactive iodine, increasing the quality of life in these patients. Caution should be recommended in the follow-up of unselected DTC patients only with stimulated Tg levels.Los estudios publicados que confirman la seguridad y eficacia de la TSH recombinante (rhTSH llevaron a un incremento en el interés para su uso como adyuvante terapéutico en el CDT (ablación o tratamiento de enfermedad metastática. Para evaluar la efectividad de la administración de dosis terapéuticas de RI luego de la administración de rhTSH, realizamos un análisis retrospectivo en 28 pacientes con CDT que recibieron 39 dosis de RI. Los pacientes se dividieron en 2 grupos: GI (n=17 pacientes con captación en el lecho tiroideo y niveles indetectables de tiroglobulina (Tg bajo tratamiento supresivo con levotiroxina y GII (n=11, pacientes con enfermedad metastática local o a distancia, previamente comprobada. El seguimiento promedio luego de la primera dosis de RI fue de 32 ± 13 meses (rango 8 a 54 meses. Dieciseis pacientes (94% del GI fueron considerados libres de enfermedad y un paciente presentó una persistencia local. En el GII, las captaciones patológicas fueron: en 4 pacientes en pulmones; en 4 en mediastino y en 3 a nivel lateral cervical. Dos pacientes con captaciones mediastinales presentaron niveles indetectables de Tg. En el seguimiento, dos pacientes con captaciones latero-cervicales se consideraron libres de enfermedad, cuatro pacientes murieron (tres debido al CDT avanzado y cinco de los restantes tienen enfermedad persistente. En conclusión, la terapia con RI luego de rhTSH fue útil para ablacionar remanentes normales en el GI. Los niveles de Tg estimulados con rhTSH fueron indetectables en dos pacientes con metástasis mediastinales. El uso de rhTSH parece ser una alternativa válida frente a la suspensión de la terapia hormonal en el tratamiento de pacientes con CDT, incrementando la calidad de vida de estos pacientes.

  2. Dosimetric calculation of I-131 activity for the treatment to patients having differentiated thyroid cancer. Benefits and limitations; Calculo dosimetrico de la actividad de I-131 para tratamiento de pacientes con cancer diferenciado de tiroides (CADT). Beneficios y limitaciones

    Energy Technology Data Exchange (ETDEWEB)

    Cabrejas, R. C.; Chebel, G. M.; Fadel, A. M.; Rojo, A. M.; Deluca, G.; Degross, O. J.; Valdivieso, C. M.; Carbejas, M. L.

    2006-07-01

    Maximum safe activity calculation, that has to be administered for treatment to patients having Differentiated Thyroid Cancer (CADT). No important side effects should be produced. Post treatment evolution was analysed. 23 Dosimetric studies were performed determining blood and whole body uptake curves (CE)during 5 days. Using the MIRDOSE software, the maximum safe activity in the whole body (CE)was calculated. The retained activity in the body (AR), 48 hs. post tracer dose. Should have been less than 2.96 GBq so as to avoid lung fibrosis. 17 patients that received activities<11.1 GBq, had no side effects. Three patients presents special situations: high AR, users in the mouth, and plaque to and leucopenia. This methodology has benefits because AT can be estimated. This was possible for 85% of the patients. When AR was high at 48 hr, AT was diminished to avoid pulmonary lesions. Tumor absorbed dose estimation, will allow the administration of AT>11.1 GBq in the future. (Author)

  3. Visiones y expectativas sobre el trabajo: Estudio de jóvenes de circuitos educativos diferenciados Visions and expectations of work: Study of young people from different educational circuits

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    Leandro Legaspi

    2010-12-01

    Full Text Available En un contexto caracterizado por la precariedad y vulnerabilidad existe una importante desigualdad en las trayectorias educativas y laborales de los jóvenes, según el sector social y el circuito educativo de pertenencia. El presente artículo se centra en las valoraciones y significados del trabajo de jóvenes pertenecientes a circuitos educativos contrastados. Se destaca el peso que tienen las experiencias laborales sobre las representaciones, los significados y la importancia (absoluta y relativa del trabajo. Los resultados obtenidos enfatizan el peso que tienen los diversos contextos de pertenencia sobre las visiones y expectativas en relación al trabajo, y también sobre las trayectorias educativas y laborales. De este modo, los jóvenes del Circuito Educativo Bajo se ven más inclinados por factores contextuales a buscar un trabajo que los del Circuito Alto, quienes podrían priorizar aspectos subjetivos del trabajo, vinculados a la autonomía y al crecimiento personal.In a context of insecurity and vulnerability there is substantial inequality in the education and employment paths of young people, depending on their social status and the educational circuit they belong to. This article focuses on the values and the meanings of work that young people, from different educational circuits, have. We also emphasize how work experiences affect the representations, the meanings and the importance (absolute and relative of work. The results expose the relevance that different contexts of belonging have, to the visions and expectations of work, as well as the educational and employment trajectories. Thus, young people who belong to the Low Educational Circuit are more likely to look for a job because of contextual factors, than youth from the High Educational Circuit. Indeed, they would prioritize subjective aspects of work related with autonomy and personal growth.

  4. Compostos biotivos em variedades de arroz integral: caracterização, quantificação e estudo da atividade funcional em adipósitos diferenciados de células tronco mesenquimais

    OpenAIRE

    Minatel, Igor Otavio [UNESP

    2015-01-01

    Bioactive components in rice vary depending on the variety and growing condition. Fat-soluble components such as γ-oryzanol, tocopherols, tocotrienols, carotenoids and fatty acids were analyzed in brown, sugary brown, red and black rice varieties using established high-performance liquid chromatography (HPLC) and GC methodologies. In addition, these colored rice varieties were further analyzed using a high-resolution liquid chromatography-mass spectrometry/mass spectrometry (LC-MS/MS) (LTQ-Or...

  5. Introducción de cultivos de cobertura en la rotación soja-maíz: efecto sobre algunas propiedades del suelo Inclusion of cover crops in a soybean-corn rotation: effect on some soil properties

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    Silvina Beatriz Restovich

    2011-07-01

    Full Text Available Los suelos franco limosos de la Pampa Ondulada bajo siembra directa (SD con predominio de soja y, secundariamente maíz, registran una progresiva disminución de su fertilidad física y química. La introducción de cultivos de cobertura (CC en sistemas agrícolas cada vez menos diversificados podría constituir una herramienta agronómica para mitigar esta degradación edáfica. Los objetivos del trabajo fueron: 1 evaluar el efecto de diferentes CC sobre algunas propiedades del suelo (porosidad, distribución de tamaño de poros, estabilidad estructural, densidad aparente, carbono orgánico del suelo (COS, carbono lábil y 2 analizar la evolución de las propiedades edáficas durante la introducción de CC en la secuencia soja-maíz bajo SD. En 2005, se instaló un ensayo sobre un Argiudol típico (franco limoso con diferentes especies de ciclo otoño-invernal, utilizadas como CC. Las especies fueron: cebada forrajera (Hordeum vulgare L., ray grass (Lolium multiflorum L., avena (Avena sativa L., cebadilla (Brumus unioloides L., vicia (Vicia sativa L., colza (Brassica napus L., nabo forrajero (Raphanus sativus L., una consociación de vicia y avena y un testigo sin CC. Los cambios en las propiedades edáficas producidos durante la introducción de CC fueron: aumento de la macroporosidad y de su estabilidad y aumento del COS y de su fracción lábil. Estos cambios fueron de mediana a baja magnitud, se registraron principalmente próximos a la superficie (0-5 cm, estuvieron asociados a los momentos en los que se realizaron aportes importantes de C y fueron fáciles de revertir en asociación con períodos de lluvias intensas. El efecto acumulado de la rotación mostró mayor aporte de COS al sistema en presencia de CC. De los CC probados, se destacó el nabo forrajero como generador de porosidad y la avena como estabilizadora del sistema poroso.Silt loam soils of the Rolling Pampas cultivated with soybean and, secondarily, corn under no

  6. RESISTENCIA AL CORTE EN DISCONTINUIDADES CON DIFERENTES GRADOS DE RUGOSIDAD

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    Javier Fernando Camacho Tauta

    2009-01-01

    Full Text Available En esta investigación se realizaron ensayos triaxiales sobre rocas artifi ciales elaboradascon un mortero (arena, cemento y agua de diferente resistencia. Se incluyeron cilindros sin y con una discontinuidad orientada a 60° con respecto al eje horizontal y tres diferentes grados de rugosidad, (pulida plana, pulida ondulada y ondulada. Se determinaron los parámetros de resistencia de las probetas de mortero y se analizó la infl uencia de los diferentes grados de rugosidad utilizando el criterio de Barton, obteniendo el coefi ciente de rugosidad de la discontinuidad.

  7. Problematic economic environment, landscape characterization for relief in an area of ​​the Pampa Loesica plana, pozo del Molle, Cordoba, Argentina

    International Nuclear Information System (INIS)

    Mansilla, L del V.; Karlsson, A.

    2010-01-01

    This research work was made in Argentina, province of Córdoba, near Pozo del Molle. Located East of the plain of Córdoba, in the geomorphological unit Pampean Loessic Plain. The landscape of this area is made of flat media rises framed by elongated depressions oriented mainly to the SW - NE y NW - SE, in which intersection flooded low-lying area are generated temporally. The human impact, together with the climate changes, mainly the increase in precipitations, affects the economic-environmental problems of the area. The elongated depressions are considered, globally, a problem, because of the soil erosion, in these depression, the agricultural production is reduced. Because of de complexity of the landscape, it was made different searches of topographical parameters, density of low-lying areas and soil variation. With all final results, the economic-environmental units was identified, usefull to make tax relief procedures, and for relate these variations with the soil productivity

  8. Ao sul do sul o mar também é pampa : sensibilidades de verão na Villa Sequeira, Rio Grande/RS (1884-1892)

    OpenAIRE

    Felipe Nóbrega Ferreira

    2012-01-01

    No presente trabalho apresentamos uma estação balnear chamada Villa Sequeira, localizada na cidade de Rio Grande, Rio Grande do Sul. Projetada a partir do ano de 1884 pela empresa Companhia Carris Urbanos do Rio Grande, ela inaugurou sua primeira temporada de banhos em 1889-1890. Nos debruçamos sobre o tema dos banhos de mar entendendo que a região litorânea sofreu um processo de obliteração de suas práticas, notadamente as balneares, na composição das representações que circundam o Estado do...

  9. Water quality in a lagoon in the southeast pampa region of Argentina Calidad del agua en una laguna del sudeste pampeano (Argentina

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    C. Fernández

    2007-03-01

    Full Text Available This work evaluates the chemical and bacteriological qualities of the recreational waters of the Sauce Grande lagoon (Argentina. Samples were taken between March 2002 and December 2003. Ninety-six samples from three sampling stations were analyzed in order to determine the density of aerobic heterotrophic microorganisms, the presence of sulphite-reducing clostridia, and the most probable number of total coliforms, E. coli, fecal enterococci and P. aeruginosa. The water pH, temperature and chemical composition (N-NO3-, PO4³-, Na+, Ca++ +Mg++, EC and SAR were also determined. Statistical analysis shows an increase in the microbial parameters of fecal pollution and in the population of heterotrophic microorganisms during the warmest months, influenced by higher temperatures and the more intensive recreational use. Bacterial count indicated that fecal pollution was statistically lower at the recreational area monitoring station; however, P. aeruginosa, an opportunistic pathogen, was present in higher than permitted densities in all determinations. These results show that, from the physico-chemical point of view, anthropogenic activities do not significantly affect the quality of the resource.En el presente trabajo se evaluó la calidad bacteriológica y química en aguas de la laguna Sauce Grande (Argentina. Los muestreos fueron realizados entre marzo de 2002 y diciembre de 2003. Se analizaron un total de 96 muestras provenientes de tres estaciones de monitoreo, determinando: densidad de microorganismos heterótrofos mesófilos, presencia de clostridios sulfito-reductores y número más probable de coliformes totales, Escherichia coli, enterococos fecales y Pseudomonas aeruginosa. También se efectuaron determinaciones de pH, temperatura del agua y composición química (N-NO3-, PO4(3-, Na+, Ca++ + Mg++, CE y RAS. Se observó que en los meses más cálidos se produjo un aumento en los parámetros microbianos indicadores de contaminación fecal y en la población de microorganismos heterotrófos; dicho comportamiento estaría influenciado por el aumento de la temperatura y el mayor uso recreativo del recurso. El recuento de bacterias indicadoras de contaminación fecal fue menor en la estación de monitoreo donde se encuentra ubicado el balneario; no obstante, P. aeruginosa, patógeno oportunista, estuvo presente en todas las determinaciones con densidades mayores a los valores permitidos. Desde el punto de vista fisicoquímico, no hay un aporte antropogénico significativo de contaminantes que afecten la calidad del recurso.

  10. Application of a health risk assessment model for cattle exposed to pesticides in contaminated drinking waters: A study case from the Pampas region, Argentina.

    Science.gov (United States)

    Dubny, Sabrina; Peluso, Fabio; Masson, Ignacio; Othax, Natalia; González Castelain, José

    2018-04-01

    Using the USEPA methodology we estimated the probabilistic chronic risks for calves and adult cows due to pesticide exposure through oral intake of contaminated surface and ground waters in Tres Arroyos County (Argentina). Because published data on pesticide toxicity endpoints for cows are scarce, we used threshold levels based on interspecies extrapolation methods. The studied waters showed acceptable quality for cattle production since none of the pesticides were present at high-enough concentrations to potentially affect cow health. Moreover, ground waters had better quality than surface waters, with dieldrin and deltamethrin being the pesticides associated with the highest risk values in the former and the latter water compartments, respectively. Our study presents a novel use of the USEPA risk methodology proving it is useful for water quality evaluation in terms of pesticide toxicity for cattle production. This approach represents an alternative tool for water quality management in the absence of specific cattle pesticide regulatory limits. Copyright © 2018 Elsevier Ltd. All rights reserved.

  11. Locura y crimen en el discurso médico-jurídico. Argentina, Territorio Nacional de la Pampa, ca. 1900

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    Di Liscia, María Silvia

    2003-12-01

    Full Text Available The aim of this article is to analyze a mental pathology, that of hysteria in relation to gender criminality and the ethic making of positive-negative referents, noting the ways in which they turn into discourse and into specific social practices. In the first place, affords the study a special approach towards the judicial question that connects madness and crime in an interior part of Argentina. The characterisation of a mental illness in particular allows us to comment on the application of fin-de-siecle positivist ideology in secondary levels and its adaptation to the solution of certain problems. Finally, it helps us examine not only medical and judicial behaviour but also the construction of professional’ discourse about feminine and masculine mental pathologies, within which an idea of the social problem of Argentina’s interior is embedded, one that includes gender relations.

    El objetivo de este artículo es el análisis de una patología mental, la histeria, en relación con la criminalidad de género y la elaboración ética de referentes positivo-negativos, observando la forma en la cual se resuelven a nivel discursivo y en las prácticas sociales concretas. Remite en primer lugar a un acercamiento particular al problema jurídico que conecta crimen y locura en un territorio del interior argentino. De esta manera, la caracterización de una enfermedad mental en un ámbito específico, permite observar la aplicación en niveles secundarios de la ideología positivista finisecular y su adaptación a la resolución de problemas concretos. Finalmente, posibilita indagar no sólo la actuación médica y judicial sino también de las elaboraciones discursivas de los profesionales sobre las patologías mentales femeninas y masculinas, en las cuales está imbricada una conceptualización de la “cuestión social” en el interior argentino, que incluye a las relaciones de género.

  12. The IAF's Argentine Grantees: Caught in the Crisis. Indigenous Awakening; Self-Help and the Cities; Storm Clouds and Hope on the Pampa.

    Science.gov (United States)

    Durbin, Paula

    2003-01-01

    Examines how Inter-American Foundation's grantees in Argentina are coping with the country's economic crisis of 2001. Describes community development projects in Indigenous regions, the role of urban schools as the only functioning public institution providing human services, literacy education in Patagonia, job training and support for…

  13. Biotecnología en las pampas: ciencia y política en la Argentina de la última reinstauración democrática

    Directory of Open Access Journals (Sweden)

    Vallejo, Gustavo

    2011-08-01

    Full Text Available This paper explores the relationships between scientific management and politics in Argentina during the 1980s and 1990s, in regards to the foundation of what was to be the main Institute of Biotechnology, the INTECH. Based on this reality, it focuses on the scientific perspectives of authorities looking to promote specific actions, such as bringing back expatriated researchers, e.g., summoning a Nobel Prize recipient, as well as a figure of widespread popularity in the mass media. In this context, there were particular political and economic positions that determined the possibility of development of science in Argentina.

    El trabajo indaga relaciones entabladas entre gestión científica y política en la Argentina durante las décadas del ‘80 y ‘90 del siglo XX, en torno a la creación de lo que debía ser el principal Instituto de biotecnología, el INTECH. A partir de ese hecho se interroga la mirada de la ciencia enunciada desde poder público para impulsar acciones como el retorno de investigadores expatriados, convocando a un Premio Nobel, o luego a una figura de amplia popularidad en los mass media. Dentro de esta problemática se sitúan coyunturas políticas y económicas de la última restauración democrática que plantearon precisas condiciones de posibilidad para el desarrollo de la ciencia en la Argentina.

  14. Potencialidad de estudios arqueobotánicos sobre tártaro dental de cazadores recolectores de la provincia de La Pampa, Argentina

    Directory of Open Access Journals (Sweden)

    Musaubach, María G.

    2012-01-01

    Full Text Available El análisis del tártaro dental desde una perspectiva arqueobotánica, constituye un acercamiento innovador en el estudio de la alimentación humana, la manipulación de fibras vegetales con los dientes y el uso de plantas con fines medicinales. Esto se debe a que la identificación de microfósiles de interés arqueológico que quedaron entrampados en el sarro nos permite conocer qué plantas fueron consumidas o manipuladas con los dientes. En este trabajo se analizan los microfósiles extraídos del tártaro dental de individuos del sitio Chenque I y se evalúa la técnica apropiada para recuperar y observar la mayor cantidad y tipo de micropartículas. Las principales morfologías de fitolitos registradas corresponden al tejido epidérmico de especies de Poaceae. Es notable la presencia de restos de tejidos epidérmicos de frutos de (sp. Prosopis y gramíneas presentes en los molares. El tejido entrampado en el sarro, resulta un dato de interés al momento de analizar las prácticas alimenticias y de salud bucal de los cazadores recolectores pampeanos.

  15. Evaluación de indicadores de estres funcional en una muestra procedente del sitio Chenque I (Parque Nacional Lihue Calel, prov. de La Pampa

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    Baffi, Elvira Inés

    2005-01-01

    Full Text Available La posibilidad de identificar indicadores de actividades cotidianas mediante un análisis bioarqueológico resulta relevante dado que ellas se vinculan con los patrones de subsistencia y uso del cuerpo de los individuos. Uno de esos indicadores involucra una serie de cambios degenerativos en las articulaciones (cartílago y epífisis óseas conocidas bajo el rótulo general de osteoartritis. Se considera que el uso recurrente de una articulación produce una serie de alteraciones que incluyen la formación de labios en las superficies óseas, pitting, osteofitos, porosidad y eburnación. La evaluación comparativa del grado de manifestación de estos indicadores de estrés permite obtener información acerca del nivel de exigencia en el uso de determinadas porciones anatómicas en las actividades cotidianas. En este trabajo se presentan los primeros resultados del análisis de los restos recuperados en el Sitio Chenque I. El mismo es un cementerio utilizado por grupos cazadores-recolectores durante el Holoceno Tardío final, que contiene dos unidades bien delimitadas: la Unidad Superior, en la cual los restos óseos presentan un alto grado de fragmentación y mezcla, y la Unidad Inferior, que contiene numerosas estructuras de inhumación bien delimitadas. Se evaluarán los niveles de prevalencia de las manifestaciones de artritis de los restos de ambas unidades, teniendo en cuenta las características específicas de cada una de ellas.

  16. Présentation géomorphologique de la région de Pampas-San Juan-Huascoy

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    1975-01-01

    Full Text Available Cette présentation dépasse en fait la seule géomorphologie et s'intéresse aux traits physiques du paysage étudié, en relation avec les activités humaines. Une première partie concerne la lithologie et la structure générale du secteur il s'agit d'affleurements volcaniques (andésites percés par des apophyses du batholite andin (diorites. Les coulées andésitiques présentent un pendage général peu accentué vers le S et sont affectées de grands plis. L'ensemble a été profondément altéré sur plusieurs mètres d'épaisseur par endroits, constituant des altérites sablo limoneuses. La deuxième partie concerne l'étude des unités géomorphologiques du paysage: l'étage d'altitude, au-dessus de 4200 m est marqué par le froid et le rôle du gel (geosystéme de la puna et des éboulis actifs l'étage des éboulis colonisés (entre 3400 et 4200 m correspond à la disparition du gel à rôle actif et aux têtes de ravinements actuels l'étage des formations colluviales glissées au dessous de 3400 m est particulièrement important car il constitue l'essentiel des terroirs des communautés étudiées. On y note de très grands mouvements de masse anciens (décollements-glissements, de petits mouvements anciens et actuels (décollements-glissements, coups de cuiller, solifluxion pelliculaire, enfin l'action du ruissellement superficiel et du ravinement. L'étage ensoleillé des éboulis à cactus commence vers 2200 m. caractérisé par sa sécheresse et les phénomènes de ravinement ('huaycos' enfin, en fond de vallée, quelques restes de terrasses et de cônes se situent aux alentours de 1600 m. d'altitude. La troisième partie met en évidence l'influence anthropique sur la morphogenèse actuelle et une dernière partie essaie de synthétiser les observations sous forme de modèles de systèmes. Des observations précises ('sondages' et des résultats granulométriques sont présentés en annexe. Esta presentación va más allá de la geomorfología y se interesa por los rasgos físicos del paisaje estudiado en relación con las actividades humanas. Una primera parte concierne a la litología y a la estructura general del sector se trata de afloramientos volcánicos (andesitas con apófisis del batolito andino (dioritas Las coladas andesíticas presentan un buzamiento general débil hacia el S y están afectadas por grandes pliegues. El conjunto ha sido muy meteorizado a veces por varios metros de espesor, lo que ha constituido alteritas areno-limosas. La segunda parte se interesa por las unidades geomorfológicas del paisaje el piso de altura, por encima de los 4200 m, se encuentra afectado por el frío y el papel del hielo (geosistema de la puna y de los derrubios vivos el piso de los derrubios colonizados (entre 3400 y 4200 m se ubica donde el hielo no tiene un papel activo y donde empiezan las cárcavas actuales el piso de las formaciones coluviales deslizadas, por debajo de los 3400 m, tiene una importancia particular por el hecho de constituir la parte esencial de los terruños de las comunidades estudiadas. Se notan muy grandes movimientos en masa antiguos (desprendimientos-deslizamientos, pequeños movimientos antiguos y actuales (desprendimientos-deslizamientos, golpes de cuchara, solifluxión pelicular, por fin la acción de la escorrentía superficial y de los entalles. El piso soleado de los derrubios con cactus empieza hacia los 2200 m, muy seco y afectado por cárcavas ('huaycos' por fin, en el fondo del valle, algunos restos de terrazas y de abanicos se ubican a unos 1600 m de altura. La tercera parte relaciona la influencia antrópica con la morfogénesis actual y una última parte trata una síntesis de las observaciones por medio de modelos de sistemas. Observaciones precisas ('sondeos'' y resultados granulométricos figuran en anexo. This presentation goes beyond geomorphology as such and deals with the physical features of the landscape studied as related to human activities The first part has to do with lithology and the general structure of the sector. There are volcanic outcrops (andesites pierced by apophyses of the andean batholite (diorites. The andesitic flows present a general dip slightly accentuated to the south and is affected by large folds. The whole was deeply altered on several meters thickness at times, constituting sand and loam alterites. The second part concerns the study of geomorphic units of the landscape: the altitude stage, above 4 200 m, is marked by coldness and the effects of frost (geosystem of the puna and the active drifts the stage of colonized drifts (from 3.400 to 4.200 m. corresponds to the disappearance of the active effects of frost and the beginning of colluvial formations which slid below 3.400 m. is particulary important because most of the lands of the communities studied fall in this category. One observes there great and ancient mass movements small, ancient and present mass movements (various types of landslides, pellicular solifluxion and finally, the effects of superficial runoff and riling. The sunny stage at the cactus drifts begins near 2 200 m. and is characterized by dryness and riling phenomena (huaycos at the bottom of the valley are found rests of terraces and cones around 1800 m. in altitude The third part shows anthropic influence on present morphogenesis and the last part attempts to synthesize the observations ('soundinds' and granulometric results are presented in the annex.

  17. Prémiers éléments d'une approche écologique du versant de Pampas-La Florida-San Juan-Huascoy

    Directory of Open Access Journals (Sweden)

    1975-01-01

    Full Text Available Cet article constitue un premier essai de mise au clair des données de la littérature (qui brillent par leur rareté, leur imprécision et le non fondement de leurs affirmations, qui arrivent ainsi a être contradictoires, d'appréciation des conditions du milieu et de débroussaillage des premières observations de terrain. La décomposition du relief en ses composantes (altitude, pente, exposition, position topographique nous apporte quelques renseignements complémentaires sur les conditions climatiques et de substrat auxquelles sont soumises les plantes. Elle permet de mieux comprendre la localisation des types d'exploitation humaine du milieu et les variations à grande échelle de la végétation. Un dénivelé de plus de 3000 m (de 1550 m à 4900 m, des fortes pentes (30 à 45º pour la grande majorité et des expositions surtout vers le Nord et l'Ouest: sont les grands traits du relief. La température moyenne annuelle varie de 20ºC dans le bas du terroir à 2ºC en haut. L'amplitude annuelle est très faible, de l'ordre de 1,6ºC, alors que l'amplitude journalière est élevée, de même que les écarts entre l'ombre et la lumière. Les gels nocturnes sont quasi quotidiens à Cancau, mais se font aussi sentir à presque toutes les altitudes. Les précipitations annuelles, inférieures à 250 mm dans la zone basse, ne doivent guère dépasser 700 mm dans la partie haute. Mais cette quantité plus importante, combinée à des températures plus basses, et à une meilleure distribution annuelle des précipitations, permet entre autres de pratiquer des cultures en sec au-dessus de 3500 m. En dessous de cette altitude, l'eau constitue un facteur limitant particulièrement contraignant. Les pluies sont concentrées dans une période allant d'octobre à avril. D'autres facteurs prennent de l'importance, avec l'altitude à l'altitude de Cancau (4600 m, la pression atmosphérique est réduite à moins de 60% de celle au niveau de la mer les pressions d'oxygène et de gaz carbonique sont réduites dans les mêmes proportions la richesse de l'atmosphère en radiations ultraviolettes et infrarouges est considérablement augmentée. Tous ces facteurs concourent à une réduction et une densification du port des plantes (touffes, coussinets. Mis à part les affleurements rocheux, les éboulis vifs et les rares sols humifères, l'essentiel des substrats est constitué par un sol limono-sableux, acide, pauvre en matière organique, facilement mobilisable, tant en saison sèche (piétinement, vent,... qu'en saison des pluies (mouvements de masse, rigoles,... L'homme exerce depuis longtemps une forte pression sur le milieu, pression ressentie d'autant plus durement que des conditions climatiques (sécheresse, gel,... et de substrat (fortes pentes, sols fins,... difficiles confèrent au milieu une sensibilité particulière elle se note par la pauvreté de la flore, l'homogénéité de la végétation, le faible couvert végétal et la quasi absence d'arbres. Trois thèmes ont été retenus pour la cartographie de la végétation: - la structure de la végétation, traduite par les recouvrements respectifs de trois formes biologiques: les ligneux hauts (plus de 2 m, les ligneux bas (moins de 2 m et les herbacées - son niveau d'artificialisation, évaluation de l'intensité des modifications apportées par l'homme au milieu originel. - sa composition floristique essentielle. Les relevés stationnels développent ces trois mêmes thèmes. Les premières observations font ressortir, trois grands étages de végétation: - étage semi-désertique: il s'étend jusque vers 2400 m d'alt. et est caractérisé par les cactus columnaires, Carica candicans et Schinus molle le climat y est chaud (moyenne annuelle supérieure à 15ºC et sec (précipitations annuelles inférieures à 250 mm. On y distingue trois faciès: -faciès type, à cactacées, dominé par Cereus macrostibas, sur éboulis et sols secs -faciès à Tillandsia et Puya sur les affleurements rocheux -faciès à Schinus molle et Arundinacées dans les fonds de vallée humides, qu'il partage avec les cultures fruitières du 'fundo'. -étage tempéré: il est occupé par une végétation de type maquis à petits buissons et graminées c'est la zone de plus forte pression humaine. Le climat y est tempéré, mais sec du fait de la longue sécheresse hivernale les gels nocturnes sont fréquents en saison sèche. Il regroupe sûrement plusieurs étages qu'il nous est difficile de séparer pour l'instant. On peut néanmoins y distinguer: -une zone basse (en dessous de 3000 m, à Agave Pitcairnia et Fourcroya -une zone moyenne à nombreux ligneux bas, ou domine Calceolaria -une zone supérieure dominée par Lupinus. -étage d'altitude: il s'étend au dessus de 4200, m et est caractérisé par une végétation basse (touffes, coussinets, rosettes basales et un climat froid (moyenne annuelle inférieure à 6ºC et relativement humide (précipitations annuelles supérieures à 600 mm. On y discerne: -une zone basse à Tafalla thuroides, -une zone moyenne à 'Ichu' (Calamagrostis, Festuca, -une zone supérieure, au-dessus de 4500 m, à végétation claire et rase, ou abondent les plantes en coussinet (Pycniphyllum, Baccharis, Opuntia,... Les graminées préfèrent les substrats meubles, laissant les affleurements rocheux aux plantes en coussinet. Les dépressions humides sont le siège de tourbières à Distichia muscoides. Sur l'ensemble du versant, les Composées sont la famille la mieux représentée, avec les Graminées. Les Broméliacées et les Cactacées se rencontrent à toutes les altitudes. Les ligneux hauts sont quasi absents les ligneux bas sont très abondants (buissonnants, rampants, en coussinets,.... Les formes de résistance (chaméphytes en coussinets, géophytes, hémicryptophytes, plantes succulentes, plantes aphylles, grand développement des organes souterrains, .. abondent. Este artículo constituye un primer ensayo de síntesis de los datos dispersos en la literatura, datos muy escasos, imprecisos y a veces contradictorios, de apreciación de las condiciones del medio ambiente se trata también de exponer las primeras observaciones de campo. Los componentes del relieve (altura, pendiente, exposición y ubicación topográfica traen algunos datos complementarios sobre las condiciones climáticas y de suelos que afectan a las plantas. Permiten también un mejor entendimiento de la localización de los tipos de explotación humana del medio y de las variaciones de la vegetación a gran escala. Un desnivel superior a los 3000 m. (desde 1550 hasta 4900 m., pendientes fuertes (30 hasta 45º en la mayoría de los casos y exposiciones sobre todo hacia el Norte y el Oeste constituyen los grandes rasgos del relieve. La temperatura promedio anual varía desde los 20° C en las partes bajas hasta 2° C en las partes altas. La amplitud anual es muy débil, de 1.6º C en promedio, mientras que la amplitud diaria se presenta elevada así como las diferencias entre las zonas soleadas o sombreadas. Las heladas nocturnas se presentan casi a diario en Cancau, pero afectan la mayor parte de los pisos altitudinales. Las precipitaciones anuales, inferiores a 250 Mm. en la zona baja, no deben pasar de los 700 Mm. en la parte alta. Pero esa cantidad más importante, ligada con temperaturas más bajas y con una mejor distribución anual de las precipitaciones, permite, en particular, la práctica de cultivos sin riego por encima de los 3500 m. Por debajo de esa altura, el agua constituye el factor limitante más importante. Las lluvias se concentran entre octubre y abril. Otros factores toman importancia con la altura: en Cancau (4600 m., la presión atmosférica se encuentra reducida a menos de 60% de la misma al nivel del mar y las presiones de oxígeno y de gas carbónico se encuentran reducidas en las mismas proporciones. La atmósfera se halla muy enriquecida en radiaciones ultravioletas e infrarrojas y todos esos factores contribuyen para reducir y densificar el tamaño de las plantas (matas, plantas en cojinetes. Afuera de los afloramientos rocosos, de los derrubios vivos y de los escasos suelos humíferos, la mayor parte de las formaciones superficiales la constituye una formación limo-arenosa, ácida, pobre en materia orgánica, fácilmente removida en la estación seca (pisoteo, viento como en la estación lluviosa (movimientos en masa, escorrentía. El hombre, ha presionado mucho al medio ambiente desde hace mucho tiempo, presión muy sentida por las condiciones difíciles del clima (sequía, heladas y del relieve (pendientes fuertes, formaciones superficiales livianas que confieren a este medio una sensibilidad particular. De ello resulta la pobreza de la flora, la homogeneidad de la vegetación, la cobertura vegetal débil y la casi ausencia de árboles. Tres temas han sido conservados para la cartografía de la vegetación: -la estructura de la vegetación, traducida por recubrimientos respectivos de tres formas biológicas: los leñosos altos (superiores a 2 m., los leñosos bajos (inferiores a 2 m., y los herbáceos -su grado de artificialización, evaluación de la intensidad de las modificaciones humanas al medio original -su composición florística esencial. Los inventarios estacionales desarrollan esos mismos tres temas. Las primeras observaciones dejan aparecer tres grandes pisos vegetales: -piso semidesértico: sube hasta unos 2400 m. de altura y se caracteriza por los cactus columnarios, Carica candicans y Schinus molle el clima es caliente (promedios anuales superiores a 15º C y seco (precipitaciones anuales inferiores a 250 mm.. Tres facies pueden distinguirse: -facies tipo, con cactáceas, caracterizado por Cereus macrostibas, sobre derrubios de pendientes y suelos secos -facies con Tillandsia y Puya, en afloramientos rocosos -facies con Schinus molle y Arundináceas en los fondos de quebradas húmedas donde aparecen los cultivos frutales del 'fundo'. -piso templado: lo ocupa una vegetación de tipo matorral ('maquis', con pequeñas zarzas y gramíneas se trata de la zona con mayor presión humana. El clima es templado pero seco (larga sequía del invierno austral y las heladas no son raras en la estación seca. Este piso agrupa seguramente varios pisos difíciles de separar por el momento sin embargo, se puede distinguir: -una zona baja (por debajo de 3000 m. con Agave, Pitcairnia y Fourcroya -una zona mediana con numerosos leñosos bajos y donde domina Calceolaria -una zona superior donde domina Lupinus. -piso de altura: empieza por encima de 4200 m. y se caracteriza por una vegetación baja (matas, cojinetes, rosetas y un clima frío (promedio anual inferior a 6ºC y relativamente húmedo (precipitaciones anuales superiores a 600 mm. Se distingue: -una zona baja con Tafall thuroides, -una zona mediana con 'Ichu' (Calamagrostis, Festuca, -una zona superior, por encima de 4500 m., con vegetación clara y muy baja donde abundan las plantas en cojinetes (Pycnophyllum, Baccharis, Opuntia, Las gramíneas prefieren las formaciones superficiales blandas, dejando los afloramientos rocosos a las plantas en cojinetes. Las depresiones húmedas presentan turberas con Distichia muscoides. En toda la vertiente, las Composáceas constituyen la familia mejor representada, con las Gramíneas. Las Bromeliáceas y las Cactáceas se encuentran en todas las alturas. Los leñosos altos están casi ausentes los leñosos bajos son muy abundantes (zarzas, trepadoras, en cojinetes. Abundan las formas de resistencia (camefitas en cojinetes, geofitas, hemicriptofitas, plantas suculentas, plantas afilas, gran desarrollo de los órganos subterráneos. This article is a first attempt at clarifying the data in the literature which are saarce, inaccurate, unfounded and even contradictory it seeks to take into account environmental conditions and explain early field observations. Some complementary data about climatic conditions and the substratum which affect the plants are given by breaking down the relief into its components -altitude, slope, exposure, topographic position. This allows a better understanding of location of various types of human settlements and the large scale variations in the vegetation. A difference in altitude of over 3000 m (from 1550 to 4900 m, steep slopes (30 to 45º mostly, and exposures chiefly to the North and to the West, constitute the main relief features. The average annual temperature varies from 20ºC in the lowest zones to 2°C in the highest. Annual amplitude is very small, about 1.6°C, while daily amplitude is high. There are also marked differences between temperatures in the shade and in the light. Frost occurs practically every night in Cancau, appearing at nearly every altitude, as well. Annual precipitations, below 250 mm, in the low zone, do not exceed 700 mm in the highest part. But this higher quantity, combined with lower temperatures and with a better annual distribution of rainfall allows among other things, farming without irrigation over 3500 m. Below this altitude water is a limitation and straining factor. Rainfall occurs mainly between October and April. Other factors become important with altitude at the Cancau height of 2600 m, atmospheric pressure is reduced to less than 60% of that at sea level. Oxygen and carbonic gas are reduced in the same proportions. Ultraviolet and infrared radiation in the atmosphere is increased considerably. All these factors contribute to the reduction in size and densification of plants (bunch grass, pulvinates. Apart from rocky outcrops, bare landslips and rare humifer soils, most substrata are made up of loam and sand soils, acid, poor in organic material, easily mobilized in the dry season (tramping, wind, as well as in the wet season (mass movements, rills. Man has exerted a strong pressure on the environment for a long time, a pressure more severely felt at times because of climatic conditions (dryness, frost and difficult substrata (steep slopes, fine grounds, and giving the environment a particular sensitivity. One can observe the paucity of flora, the homogeneity of vegetation, the thin vegetation cover, and the near absence of trees. Three topics have been used for cartography of vegetation: -vegetation structure with three biological forms, the tall woods (over 2 m, the low woods (below 2 m, and the herbaceous -artificialization level, evaluation of the intensity of the modifications that man brought to his environment, and -main flora composition. The first observations bring out three large vegetation stages: -semi-desert stage which extends up to 2400 m in altitude and is characterized by columnar cacti, Carica candicans and Schinus molle the climate there is warm (annual mean over 15ºC and dry (annual rainfall below 250 mm three variations are distinguished: -typical, with cactaceans and a predominance of Cereus macrostibas, on landslips end dry soils -Tillandsia and Puya on rocky outcrops. -Schinus molle and Arundinaceans on this bottom of humid valleys shared with 'fundo' fruit farming -temperate stage with, maquis type vegetation of small bushes and gramineous plants this is the zone where there is the strongest human pressure the climate is temperate but dry because of the long winter dryness it probably covers several stages which are difficult to separate now: nevertheless one can distinguish: -a low zone (below 3000 m, Agave, Pitcairnia and Fourcroya -a middle zone of plentiful low woods, with Calceolaria prevailing -a higher zone with Lupinus -altitude stage which extends above 4200 m and is characterized by a low vegetation (bunch grass, pulvinates, rosettes, cold climate (annual mean below 6ºC, and relative humidity (annual rainfall over 600 m this includes: -a low Tafalla thuroides zone -a middle Ichu (Calamagrostis, Festuca zone -a higher zone, above 4500 m, with clear and low vegetation including many pulvinate plants (Pycnophyllum, Baccharis, Opuntia. Gramineous plants prefer mobile substrata, leaving rocky outcrops for pulvinate plants humid depressions have Distichia muscoides peat bogs. On most of the valley side, the Composaceans and the Gramineans are better represented than other families. Bromeliaceans and Cactaceans are found at every altitude. Tall woods are nearly nonexistent. Low woods are numerous (bushes, pulvinates, basal rosettes. Resistance forms (Chamephytes, geophytes, hemicryptophytes, succulent scrubs, aphyllous plants and large development of subterraneous organs are numerous.

  18. El paisaje interpretado como memoria: patrimonio destruido en la pampa austral. Una propuesta y proyecto. Interpretación para la gestión de recursos culturales

    Directory of Open Access Journals (Sweden)

    Martín Lopo

    2006-12-01

    Full Text Available La lucha por la apropiación del capital material y simbólico surge, muchas veces, y en este territorio en forma muy particular, en la dinámica político demográfica del mismo, atraviesa la construcción de imaginarios y relatos sobre él y sus paisajes, y finalmente —por supuesto— emerge en el momento de generar contenidos para el manejo, difusion y desarrollo a partir de los recursos culturales. Organizar un proyecto local, con un compromiso narrativo que revise críticamente la preeminencia de la historia oficial y revierta el rol de la naturaleza como silenciador a la cultura, en la concepción de paisaje, exige la generacion de dispositivos que permitan esta pluri-significación critica sobre el patrimonio y, por sobre, todo permitan la reinserción de aquello desaparecido como memoria y como marca territorial. Encontrar y posicionar al conjunto del patrimonio destruido en los escenarios de la guerra al india implica una reflexión sobre la construcción de identidad y memoria, y sobre las practicas de gestión del patrimonio de la que somos actores implicados.

  19. La Concha Shell

    Directory of Open Access Journals (Sweden)

    Levy, Matthys P.

    1961-01-01

    Full Text Available La estructura de hormigón armado que cubre el club en el hotel La Concha, de San Juan de Puerto Rico, tiene forma de concha ondulada elipsoidal. Se ha situado en un estanque poco profundo, del que emerge como si hubiese venido del océano que tiene delante.

  20. Zooplankton diversity and its relationship with environmental changes after the filling of a temporary saline lake in the semi-arid region of La Pampa, Argentina Diversidad zooplanctónica y su relación con cambios ambientales luego del llenado de una laguna salina temporaria de la región semiárida de La Pampa, Argentina

    Directory of Open Access Journals (Sweden)

    Alicia M Vignatti

    2012-11-01

    Full Text Available Temporary water bodies can remain active as such for varying periods. However, they are reservoirs (as "egg banks" of species adapted to these special conditions. In central Argentina, there are numerous temporary lakes, which have only recently begun to be studied. The aim of this work was to describe the succession of changes in diversity, abundance and biomass of zooplankton as well as in the environment, over a period of eleven months, as from the filling of a temporary saline lake, and test the hypothesis that i salinity affects negatively the richness and abundance but positively the biomass, and ii due to changes in environmental conditions produced by advancing the hydroperiod, different species emerge from the egg bank at different times. At the beginning, when salinity was reduced and the concentration of chlorophyll-α was higher, we recorded the highest diversity, due mainly by less tolerance species. Later, as salinity increased, the macrophyta Ruppia cirrhosa developed and covered 90% of the surface of the lake, the concentration of chlorophyll-α decreased and the water transparency increased. The zooplankton richness decreased and the community was integrated only by halotolerant species. In the first two months, there was an increased replacement of species, indicated by the high value of Whittaker's beta diversity index (0.63, the density was high, with a predominance of microzooplankton, so the registered biomass was relatively reduced. Then, abundance decreased markedly, and was mostly dominated by macrozooplankton, so the biomass increased. When salinity exceeded 11 g L-1, there was a predominance of the halophilic cladoceran Daphnia menucoensis, a species of ecological importance because it's high grazing pressure on phytoplankton. In this study, in addition to the modulating effect of salinity on the richness, abundance and zooplankton biomass, it was verified that the diversity present in the egg bank of temporary saline lakes is higher than that recorded in the water column at any time during hydrophases.Los cuerpos de agua temporarios pueden permanecer activos durante períodos variables, pero son reservorios ("bancos de huevos" de especies adaptadas a estas especiales condiciones. En el centro de Argentina existen numerosos lagos temporarios, que sólo recientemente han comenzado a ser estudiados. El objetivo de este trabajo fue describir la sucesión de cambios en la diversidad, abundancia y biomasa de zooplancton y en los parámetros ambientales, durante once meses, a partir del llenado de un lago salino temporario y probar las hipótesis de que i la salinidad afecta negativamente la riqueza y abundancia pero positivamente a la biomasa y ii debido a los cambios ambientales producidos al avanzar el hidroperíodo, diferentes especies emergen del banco de huevos en momentos diferentes. Al principio, cuando la salinidad fue reducida y la concentración de clorofila-a elevada, se registró la mayor diversidad, con especies menos tolerantes. Más tarde, la salinidad aumentó, la macrófita Ruppia cirrhosa cubrió el 90% de la superficie del lago, la concentración de clorofila-a disminuyó y la transparencia aumentó. La riqueza disminuyó y la comunidad pasó a estar integrada por especies halotolerantes. Durante los primeros dos meses se verificó alto reemplazo de especies, indicado por elevados valores del índice de diversidad beta de Whittaker (0,63, la densidad fue más elevada, y predominó el microzooplancton, lo que produjo que la biomasa fuese relativamente reducida. Luego, la abundancia decreció marcadamente y dominó el macrozooplancton, aumentando la biomasa. Cuando la salinidad superó 11 g L-1, se registró el predominio del cladócero halófilo Daphnia menucoensis, una especie de importancia ecológica debido a su elevada presión de pastoreo sobre el fitoplancton. En este estudio, además del efecto modulador de la salinidad sobre la riqueza, abundancia y biomasa zooplanctónica, se verificó que la diversidad presente en el banco de huevos de los lagos temporarios salinos es mayor que la registrada en la columna de agua en cualquier momento de las hidrofases.

  1. Behaviour of enzymatic activities and root elongation in Argiudoll soils from the Argentine Humid Pampa treated with biosolids Comportamiento de actividades enzimáticas y elongación de raíces en suelos Argiudoles de la Pampa Húmeda, Argentina, tratados con biosólidos

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    E.B.R. Perotti

    2008-06-01

    Full Text Available The incorporation of biosolids to soil is a strategy aiming at the re-location of these materials in the environment with a useful end: soil fertilization. In this work, the response of two Argiudoll soils (one with more than 100 years of agriculture and the other, a virgin one to biosolid incorporation was studied under laboratory conditions. To measure this response, soil enzymatic biodescriptors, such as dehydrogenase and urease activities, and tests related to plant physiology (the root elongation test were employed. The addition of the biosolid to both soils had a stimulating effect though different on each soil according to the added dose. Adjustment of the regression line for dehydrogenase activity with root elongation was positive and statistically significant (pLa incorporación de biosólidos al suelo es una estrategia que tiene como objetivo la reubicación de estos materiales en el ambiente con un fin útil, como es la fertilización del suelo. En este trabajo se estudió, en condiciones controladas de laboratorio, la respuesta de dos suelos Argiudoles (uno con más de 100 años de agricultura y otro virgen frente a la perturbación físico-química y biótica que genera la incorporación de un biosólido. Para medir esta respuesta se emplearon dos biodescriptores edáficos (las actividades deshidrogenasa y ureasa y un tercero referido a la fisiología vegetal, la prueba de elongación de raíces. La incorporación del biosólido en ambos suelos, en general no deprimió el funcionamiento de las actividades enzimáticas estudiadas; contrariamente, según la dosis aportada tuvo un efecto estimulante, aunque diferente, entre ambos suelos. El ajuste de la recta de regresión de la actividad deshidrogenasa con la elongación de las plántulas fue positivo y altamente significativo, lo que indica la complementaridad de ambos descriptores. Los resultados obtenidos sugieren que los biodescriptores empleados resultaron aptos para estudiar el impacto que produce la incorporación de biosólidos a suelos agrícolas.

  2. Realization of R and D and its composition in the Spanish manufacturing company, differentiated analysis of the determinants of research and development; Realizacion de I+D y su composiscion en la empresa manufacturera espanola. Analisis de los determinantes diferenciados de la investigacion y el desarrollo

    Energy Technology Data Exchange (ETDEWEB)

    Barge-Gil, A.; Lopez, A.

    2012-07-01

    The aim of this paper is to explore the differentiated effect of classical R and D determinants (size, technological opportunity, demand pull and appropriability) on research and development. First, we briefly expose the differences between research and development activities. Second, we analyze different issues related to R and D performance by Spanish manufacturing firms. We find that less than half of the firms with R and D perform both research and development. With respect to the determinants, we find that technological opportunity and industry level of appropriability have a higher effect on innovation activities (compared with the effect on development activities). (Author) 40 refs.

  3. Radioiodine therapy of differentiated thyroid cancer: radiologic impact of out-patient treatment with 100 to 150 mCi Iodine-131 activities; Radioiodoterapia do carcinoma diferenciado da tireoide: impacto radiologico da liberacao hospitalar de pacientes com atividades entre 100 e 150 mCi de iodo-131

    Energy Technology Data Exchange (ETDEWEB)

    Sapienza, Marcelo Tatit; Willegaignon, Jose; Ono, Carla Rachel; Watanabe, Tomoco; Guimaraes, Maria Ines Calil Cury; Buchpiguel, Carlos Alberto [Universidade de Sao Paulo (USP), SP (Brazil). Faculdade de Medicina. Servico de Medicina Nuclear; Gutterres, Ricardo Fraga; Marechal, Maria Helena da Hora [Comissao Nacional de Energia Nuclear (CNEN), Rio de Janeiro, RJ (Brazil)

    2009-07-01

    Purpose: To evaluate exposure and dosimetry to family members and environment due to outpatient radioiodine therapy of differentiated thyroid carcinoma. Methods: Twenty patients were treated with 100-150 mCi of iodine-131 on an out-patient basis. Family members dosimetry (n = 27) and potential doses inside the house were measured with thermoluminescent dosimeters. Surface contamination and radioactive wastes were also monitored. Results: Less than 1.0 mSv doses were found in 26 co-habitants and 2.8 mSv in a single case (inferior to the acceptable value of 5.0 mSv/procedure). Potential doses in the houses were inferior to 0.25 mSv, excluding the patients bedroom (mean value = 0.69 mSv). Surface contamination (mean = 4.2 Bq.cm{sup -2}) were below clearance levels. Radioactive wastes generated had a volume of 2.5 liters and a total activity estimated in 90 {mu}Ci, with a calculated exposure close to the background radiation levels. Conclusions: No radiological impact was detected after iodine therapy with 100-150 mCi on an out-patient basis followed by experienced professionals. (author)

  4. Contribution of computed tomography in patients with lung metastases of differentiated thyroid carcinoma not apparent on plain radiography who were treated with radioiodine; Contribuicao da tomografia computadorizada em pacientes com metastases pulmonares de carcinoma diferenciado de tireoide nao-aparentes na radiografia e tratados com radioiodo

    Energy Technology Data Exchange (ETDEWEB)

    Rosario, Pedro W.S.; Purisch, Saulo [Santa Casa Belo Horizonte, MG (Brazil). Dep. de Tireoide. Servico de Endocrinologia]. E-mail: pedrorosario@globo.com; Tavares, Wilson C. [Instituto Alpha de Gastroenterologia, Belo Horizonte, MG (Brazil); Barroso, Alvarao L.; Rezende, Leonardo L.; Padrao, Eduardo L. [Santa Casa Belo Horizonte, MG (Brazil). Servico de Medicina Nuclear

    2008-02-15

    Computed tomography (CT or CAT Scan) of the chest is more sensitive than radiography in the detection of lung metastases of differentiated thyroid cancer (DTC), but little information is available regarding the aggregated value of this method. The present study evaluated the response of patients with lung metastases of DTC not apparent on radiography to treatment with {sup 131}I and the value of CT in these cases. Twenty-five patients with lung metastases not apparent on radiography, who initially received 100-200 mCi I{sup 151}, were evaluated and those presenting pulmonary uptake on post-therapy WBS were submitted to a new treatment after 6 to 12 months, and so on. The chance of detection of pulmonary uptake on post-therapy WBS did not differ between patients with negative and positive CT (100% versus 91.5%). Mean serum Tg levels were higher in patients with positive CT (108 ng/ml versus 52 ng/ml). Negative post-therapy WBS was achieved in 82% of patients with positive CT and in 92.3% with negative CT and the cumulative I{sup 131} activity necessary to achieve this outcome did not differ between the two groups (mean = 300 mCi). Stimulated Tg was undetectable in 47% of patients with negative CT at the end of treatment, but in none of the patients whose CT continued to be positive. In patients with elevated Tg, the CT result apparently did not change the indication of therapy or the I{sup 131} activity to be administered. In cases with lung metastases, the persistence of micronodules on CT was associated with the persistence of detectable Tg in patients presenting negative post-therapy WBS. (author)

  5. Usefulness of radioiodine scanning in patients with moderate/high risk differentiated thyroid carcinoma in whom thyroglobulin after thyroxin withdrawal is undetectable after initial treatment; Valor da varredura com radioiodo em pacientes com carcinoma diferenciado de tireoide de moderado/alto risco com tireoglobulina (sem tiroxina) indetectavel apos o tratamento inicial

    Energy Technology Data Exchange (ETDEWEB)

    Rosario, Pedro Weslley S.; Cardoso, Ludmilla David; Fagundes, Tales Alvarenga; Reis, Janice Sepulveda; Maia, Frederico F. Ribeiro; Purisch, Saulo [Santa Casa de Belo Horizonte, MG (Brazil). Dept. de Tireoide. Servico de Endocrinologia e Metabologia]. E-mail: cepcem.bhz@terra.com.br

    2004-06-01

    We selected 92 patients without anti thyroglobulin antibodies (TgAb), in whom thyroglobulin (Tg) after L-thyroxin withdrawal was undetectable (<1 ng/ml) 6-12 months after initial therapy and who were considered to be at moderate / high risk for recurrence by this criteria: age {>=}45 years; tumor size >1.5 cm; and lymph nodes metastases in 43 (46.7%), local invasion in 26 (28.2%) or distant metastases in 23 (25%). Control whole-body scanning was negative in 78.2% of the cases and showed cervical uptake in the others. Cases presenting thyroid bed uptake in the absence of tumor recurrence did not receive radioiodine and Tg remained undetectable one year after the initial evaluation in all. Cervical uptake was not observed in 4/13 cases on repeated scan. In contrast, even in the absence of uptake and with undetectable Tg, 7 patients with recurrence confirmed by ultrasound (US) received surgical treatment. US showed 92.8% sensitivity for the detection of local-regional disease. The present study suggests that even moderate/high-risk patients without TgAb and with undetectable T g levels (off T{sub 4}) do not require radioiodine scanning after initial treatment and can be evaluated by cervical US. (author)

  6. Proyecto de factibilidad para la creación de una empresa de producción y comercialización de ropa interior fina con modelos diferenciados y ergonómicos en la ciudad de Latacunga, Provincia de Cotopaxi.

    OpenAIRE

    Vaca Fonseca, Homero; Vásquez, Juan Carlos

    2010-01-01

    Emprender un proyecto, significa dotar de los elementos conceptuales y de las herramientas fundamentales teóricas, estadísticas, matemáticas, técnicas; de mercado, que apoyen eficazmente en su elaboración y ejecución. Una suficiente sustentación práctica, mediante la cual se logren altos niveles de eficiencia, es importante para alcanzar el beneficio de las instituciones y de la sociedad en general. El proyecto de factibilidad para la creación de D¿FER CÍA. LTDA., empresa de...

  7. Gamma-spectrometric surveys in differentiated granites. I: a review of the method and of the geochemical behavior of K, Th and U; Levantamentos gamaespectrometricos em granitos diferenciados. I: revisao da metodologia e do comportamento geoquimico dos elementos K, Th e U

    Energy Technology Data Exchange (ETDEWEB)

    Ulbrich, Horstpeter Herberto Gustavo Jose; Ulbrich, Mabel Norma Costas [Universidade de Sao Paulo (USP), SP (Brazil). Inst. de Geociencias. Dept. de Mineralogia e Geotectonica], e-mail: hulbrich@usp.br, e-mail: mulbrich@usp.br; Ferreira, Francisco Jose Fonseca [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil). Dept. de Geologia. Lab. de Pesquisas em Geofisica Aplicada; Alves, Luizemara Soares [PETROBRAS S.A., Rio de Janeiro, RJ (Brazil)], e-mail: luizemara@petrobras.com.br; Guimaraes, Gilson Burigo [Universidade Estadual de Ponta Grossa (UEPG), PR (Brazil). Dept. de Geociencias], e-mail: gburigo@ig.com.br; Fruchting, Allan [Votorantim Metais, Sao Paulo, SP (Brazil)], e-mail: allan.fruchting@vmetais.com.br

    2009-07-01

    This contribution is part of a research project on the Neo proterozoic Cunhaporanga Granitic Complex (CGC), cropping out in the Ponta Grossa Arch (Parana state, SE Brazil). An initial study used the gamma-spectrometric data of the Serra do Mar Sul Aero geophysical Project, performed during the 70's for CPRM. Later, terrestrial gamma-spectrometric surveys focused on the study of the differentiated Joaquim Murtinho Granite (JMG) in the NW corner of CGC, and the Serra do Carambei Granite, to the SW. In this paper, the results obtained for JMG are presented in two parts. The first deals with methodology and the presentation of several gamma-spectrometric 'color-scale' maps, indicating that results obtained in granites depend strongly on a climatic factor, given the mobility of K during weathering in subtropical climates with strong rainfalls, also favoring a greater mobility of U. Minerals that are U and Th hosts, documented in granites, are reviewed, together with the weathering processes that control the mobility of K, U and Th in soils. Strong K signals in granitic areas submitted to these climates document the presence of fresh rock and/or effects of hydrothermal alteration, while weak or nil signals are evidence of strong leaching of K during weathering. U and Th will be retained in the residual soils, in part leading to their selective enrichment, also coupled with soil migration to lower topographic levels by colluvial transport. The larger solubility of U (as uranyl ion) allows its liberation under oxidizing conditions, and its migration, limited by the possibility of absorption in newly formed mineral and organic soil phases. Th should be retained almost totally in resistant phases and, when liberated in solution, will mostly be fixed in organic and inorganic soil substances. (author)

  8. Caracterización de prácticas con TIC por actores diferenciados en cuatro comunas de la ciudad de Medellín Identification of ICT practices over different actors in four districts of the city of Medellin: an approach to the recognition of the technological appropiation

    Directory of Open Access Journals (Sweden)

    Patiño Lemos María Ruth

    2011-01-01

    Full Text Available Este artículo, cuyo origen ha sido un proyecto de investigación con objetivos de largo alcance como el diseño, pilotaje e implementación de una propuesta comunicativo-pedagógica de formación en usos de las TIC (Tecnologías de comunicación e información, presenta los resultados del análisis cuantitativo concerniente a la caracterización de la población estudiada en términos de usos y prácticas cotidianas con las TIC digitales. Dicha población, abordada en las comunas 1, 7, 8 y 13 de la ciudad de Medellín, se agrupó por actores (estudiantes, docentes, emprendedores y empresarios con el ánimo de dar cuenta, en este aparte de la investigación, del impacto de las estrategias del programa de Medellín digital y de las transformaciones que, según las prácticas cotidianas diferenciadas por la actividad propia de la naturaleza del actor, pudieran reconocerse desde su relación con las TIC y desde éstas identificar características básicas de la apropiación. This article, which started as a research project with a long term goals scope, including the design and implementation of a communicative – pedagogical educational pilot program on the uses of the ICTs (Information and Communication Technologies, depicts the statistical analysis characterization of the population understudy about their ICT everyday utilization and practices. The sample, taken from 1, 7, 8, and 13 districts “comunas” of Medellin (low income neighborhoods was classified according to category (students, teachers, business people, and entrepreneurs, with the intention of illustrating the impact of the Medellin Digital program strategies in transforming the everyday life of each and every person according to their roles and practices, as well as identifying their relation to the ICT and their own appropriation needs.

  9. Dosimetry by means of external dose rate measurements in patients undergoing 131I thyroid cancer theraphy; Dosimetria de pacientes con cancer diferenciado de tiroides en tratamiento de terapia metabolica con 131I a partir de medidas de tasa de dosis externa

    Energy Technology Data Exchange (ETDEWEB)

    Ruiz, M.A.; Ferrer, N.; Cordoba, D.; Alonso, L.; Sastre, J.M.; Arranz, L.

    2010-07-01

    Dosimetry in patients treated with radiopharmaceuticals needs to be carried out for each individual treatment. No standardized procedure is currently available. In our study, the dosimetry for each individual treatment has been calculated using the dose protocol of the Sociedad Espanola de Fisica Medica for the treatment of thyroid cancer with 131I. This protocol is currently under review, since it proposes a procedure which only uses the daily external dose rate measurements during the patient hospital stay and an external dose rate measurement performed 7-9 days after the activity administration. The results obtained seem to be consistent with those found by other authors following different procedures. Moreover, this protocol has proved to be very useful to verify the values of doses established for red marrow are not exceeded. The maximum activity that can be administered in later treatments could also be assessed with this procedure. Additionally, the activity in urine, which cannot be measured directly, was determined. The potential dose which any patients relative or any person staying close to the patient might receive during the treatment was determined as well. These results make it possible to establish more realistic criteria regarding radiation protection. (Author).

  10. Viabilidade econômica do sistema de adubação diferenciado comparado ao sistema de adubação convencional em lavoura cafeeira: um estudo de caso Economic viability of the variable rate technology compared to the traditional system of fertilization in a coffee field: a case study

    Directory of Open Access Journals (Sweden)

    Gabriel A. E S. Ferraz

    2011-10-01

    Full Text Available A agricultura de precisão surge como uma importante ferramenta para maximizar o gerenciamento da atividade cafeeira, principalmente para esta cultura, que possui elevado custo de produção. O presente trabalho teve por objetivo fazer um estudo comparativo da viabilidade econômica de dois sistemas de adubação na lavoura cafeeira: o sistema utilizando as técnicas da agricultura de precisão e o sistema de aplicação convencional. Os dados utilizados foram extraídos dos custos de produção da fazenda Brejão, no sul de Minas Gerais, em três áreas (22 ha, 10,52 ha e 6,23 ha, onde foram realizadas aplicações de adubos de forma diferenciada nas safras de 2007/2008 e 2008/2009. O sistema de adubação em agricultura de precisão caracterizou-se por coleta de amostras de solo, georreferenciadas, e aplicação diferenciada de fósforo e potássio. Os custos da adubação convencional foram obtidos por meio de simulações, considerando a amostragem convencional do solo realizada nas glebas. Para efeito comparativo entre os sistemas de adubação, foram consideradas as operações e as quantidades de adubos necessárias em cada sistema. Entre os dois sistemas, observou-se diferenças de aplicação dos elementos fósforo e potássio, e também nas quantidades aplicadas. A adubação diferenciada foi vantajosa para as áreas de 22 ha e 10,52 ha, nas duas safras em estudo, e para a área de 6,23 ha só foi vantajosa (menor prejuízo na safra de 2008/09.The precision agriculture appears as an important tool to improve coffee field management, mainly to this culture that has high production costs. The present work intended to accomplish a comparative study of the economic feasibility of two fertilizer systems: one using the precision agriculture and other using conventional fertilization. The data base used were extracted from the production costs of the Brejão farm, in south of Minas Gerais, in three areas (22 ha, 10.52 ha and 6.23 ha, where were applied fertilizer in variable rates in the 2007/2008 and 2008/2009 harvests. The precision agriculture was characterized by the georeferenced soil sampling and the application of phosphorus and potassium in variable rates. The conventional fertilization costs were obtained by simulations considering the traditional soil sampling performed at these areas. In order to compare the two fertilization systems, it was considered the operations and the amount of fertilizer necessary in each of the fertilization system. It was realized differences in the elements and in the amount that should be applied between the two systems. The variable rate fertilization was more profitable to the area of 22 ha and 10.52 ha in the two harvests studied and to the area of 6.23 ha was profitable (less prejudice only to the last crop.

  11. Análisis de riesgos en la salud de la población rural de la pampa argentina por uso de agroquímicos en cultivo de soja

    Directory of Open Access Journals (Sweden)

    Ada Graciela Nogar

    2014-12-01

    Full Text Available Esta investigación considera los espacios rurales como resultantes de la internacionalización de capitales financieros, generalmente extra-agrarios, que no reparan en los efectos colaterales de los agrotóxicos, ni en el impacto de éstos en la salud, priorizando una visión utilitarista de crecimiento casi ilimitado. El objetivo de la investigación es desarrollar un análisis de riesgo en la salud de la población rural de la provincia de Santa Fe, Argentina, por el uso de agroquímicos en cultivo de soya transgénica. Se aplicó la metodología de riesgo entrecruzando la información de: superficie sembrada y porcentaje destinado a la soya en 2001/02 y 2010/11, volúmenes de agroquímicos más utilizados y de mayor impacto ambiental, registro de denuncias de afecciones en la salud de la población rural. Los agrupamientos resultantes expresan el riesgo en la salud por departamento y posibilitan la comparación de los niveles obtenidos para las dos campañas analizadas agrupando los valores obtenidos en 7 rangos de clase a partir de la utilización de gráficos estadísticos de dispersión. Los análisis realizados muestran que existe una relación directa entre el aumento de la superficie sembrada y el incremento de los volúmenes de agroquímicos, se observa una disminución de la población rural en toda la provincia entre las campañas 2001/02 y 2010/11, la población rural de Caseros, Rosario, Iriondo y General López presentaron riesgo alto en la campaña 2001/02 y 2010/11 mientras que Rosario disminuyó al nivel medio-alto y San Jerónimo se incorporó al nivel alto.

  12. Análisis simplificado de la eficiencia energética de una escuela rural en La Pampa – Argentina – a lo largo de su ciclo de vida

    Directory of Open Access Journals (Sweden)

    Mariela Inés Marcilese

    2013-06-01

    Full Text Available El caso de estudio de este trabajo es una escuela rural de la zona pampeana argentina donde se compara la eficiencia energética de un sistema constructivo de uso tradicional local y su versión mejorada basada en sistemas de diseño pasivos, durante su ciclo de vida. Además, se estiman valores de ahorro de emisiones de Gases de Efecto Invernadero en función de la matriz energética argentina. La eficiencia, en términos de energía de un edificio, involucra la totalidad del consumo para su fabricación (extracción, transporte y montaje de los materiales, la puesta en obra, el mantenimiento y el desmantelamiento, reciclado y tratamiento final de los residuos. Conocer estos datos en la etapa de anteproyecto puede considerarse ventajoso ya que permitiría evaluar los materiales elegidos en términos de ahorro de energía y costos a fin de lograr amortizar su valor durante la vida útil e incorporar otras alternativas de diseño. En la actualidad existen significativos problemas derivados de la escasez de recursos. La implementación del análisis del CV debería constituir un aporte revelador en el ámbito de la construcción respecto a la concientización sobre ahorro y eficiencia energética, y por lo tanto contribuir al desarrollo sustentable de las sociedades.

  13. Cultivos de cobertura,¿una alternativa viable para la región semirárida pampeana? Cover crops: a viable alternative for the semiarid Pampa region?

    Directory of Open Access Journals (Sweden)

    Romina Fernández

    2012-12-01

    Full Text Available Con el fin de evaluar el efecto que tienen los cultivos de cobertura (CC en términos de proveer cobertura al suelo, acumular N y P en su biomasa y favorecer la acumulación de agua útil y el rendimiento de los cultivos de verano, se estableció un ensayo con los siguientes tratamientos: barbecho (B sin CC, centeno (Secale cereale L. sin fertilizar como CC testigo (CT y centeno fertilizado con nitrógeno (CF, en un diseño en bloques completos aleatorizados con tres repeticiones. Al momento de secado del CC el arreglo de los tratamientos fue en parcelas dividas con la fertilización como tratamiento principal y el momento de secado como subtratamiento: secado del CC en julio (CTJ y CFJ respectivamente y en agosto (CTA y CFA respectivamente. Sobre todos los tratamientos se establecieron cultivos de verano (CV, maíz y sorgo, luego de un barbecho, a fines de noviembre. Se determinó humedad de suelo y N-NO3- a la siembra del CC, durante su ciclo y a la siembra del cultivo de verano y en floración de maíz y sorgo. Se calculó el uso consuntivo (UC y la eficiencia de uso de agua (EUA en la producción de biomasa del CC y en la producción de granos (rendimiento de los CV. En ambos momentos de secado del CC, julio (J y agosto (A, a la siembra, floración y cosecha de los cultivos de verano se determinó la cantidad de residuos del CC y su contenido de carbono, nitrógeno y fósforo. A la siembra del cultivo de verano el tratamiento B tuvo menos cantidad de agua útil que los tratamientos con CC. En CT y CF, la fecha de secado más temprana almacenó mayor cantidad de agua que la más tardía. La producción total de materia seca del CC fue mayor cuando se secó en A y en tratamientos fertilizados. Los CC fijaron importantes cantidades de C y retuvieron en sus tejidos P y N contribuyendo a disminuir potenciales pérdidas de nitratos por lixiviación durante el barbecho. El N proveniente de la mineralización de los residuos aumentó los niveles de N disponible en el suelo para el cultivo de maíz y sorgo. El rendimiento de maíz fue dependiente de la disponibilidad hídrica en el suelo a la siembra, ya que en B fue de 1015 kg ha-1, mientras que el rendimiento promedio con antecesor CC fue de 4044 kg ha-1. Para el caso del cultivo de sorgo, el manejo previo (con o sin CC no condicionó los rendimientos del mismo, debido a su ciclo fenológico más largo que facilitó que el cultivo aprovechara mayores precipitaciones específicamente durante el período entre siembra y floración.The effect of cover crops (CC on the provision of soil cover, N sequestration, accumulation of available water and the yield of a subsequent summer crop was evaluated. A field experiment with the following treatments was established: fallow without cover crop (B and rye as CC, control (CT, and fertilized (CF in a randomized complete block design with plots divided in two moments of drying of CC: July (CTJ and CFJ respectively and August (CTA and CFA respectively. On all treatments, two summer crops (CV, corn and sorghum were planted after fallowing at the end of November. Soil moisture and nitrate-N were determined at seeding of the CC, during their growing season, and at planting and flowering of corn and sorghum. Consumptive water use (UC and water use efficiency (EUA of CC, corn and sorghum were calculated. The standing biomass of CC was determined at the two dates of drying (J and A, and at planting of the summer crops and during their growing period the CC biomass litter was measured. The carbon (C, nitrogen (N and phosphorus (P contents of the dry matter were determined for all sampling dates. At planting of the summer crops, B treatment had less available water stored in the soil than CC, and J stored more water than A treatment. Total dry matter production of CC was higher in F and when dried in A. The CC sequestered important amounts of C, N and P, preventing potential leaching losses of N during the fallow, and CC litter contributed considerable amounts of both nutrients to the subsequent summer crops. Corn yields were related to water availability as conditioned by CC, and were therefore higher in CC than in B treatments (4044 and 1015 kg ha-1 respectively. Sorghum yield was not affected by previous soil management with or without CC, due to the longer phenological cycle of this crop which enabled it to make use of more rainfall specifically between planting and flowering.

  14. Impacto del ENOS sobre los rendimientos de maíz en la región pampeana argentina Impact of the ENSO on corn yields in the Argentinean pampas region

    Directory of Open Access Journals (Sweden)

    M. E. Fernández Long

    2011-06-01

    Full Text Available El fenómeno de “El Niño - Oscilación del Sur” (ENOS es uno de los principales responsables de la variabilidad climática interanual, con influencia sobre la región pampeana argentina. El objetivo de este trabajo fue analizar el impacto del ENOS sobre las variaciones anuales de la producción de maíz. La región fue dividida en 10 zonas en las cuales los rendimientos tienen una variabilidad interanual homogénea. Se utilizaron diferentes índices del ENOS. Los resultados indicaron que, en la mayor parte de la región, los desvíos de los rendimientos son, en general, positivos durante eventos “El Niño” y negativos durante “La Niña”. Sin embargo, el impacto es muy fuerte al norte y centro de la región analizada, y se debilita hacia el sur. En el sudeste de la provincia de Buenos Aires el comportamiento es diferente que en el resto. Los índices promediados de mayo a julio son, en general, un buen indicador de la influencia del ENOS sobre la productividad de los cultivos, y brindan una adecuada información para la toma de decisiones de la empresa agropecuaria, con suficiente anticipación respecto del comienzo de la campaña.The “El Niño Southern Oscillation” (ENSO phenomenon is one of the main responsible factor for interannual climate variability in the “pampas” region. This work aims to analyze the impact of ENSO on the annual variations of corn production. The region was divided into 10 areas in which yields have a homogeneous interannual variability. Five ENSO indexes were used The results indicated that, in most parts of the region, the deviations of trend line yields are, in general, positive during “El Niño” events and negative during “La Niña”. However, the impact is very strong in the North and Centre of the analyzed region and weakens southward. In the southeast of the province of Buenos Aires, the behavior is different than the rest. Averaging indexes from May to July we obtained a good indicator of the ENSO impact on maize production, providing valuable information to make decisions with enough anticipation for the crop year.

  15. Susceptibilidad a los movimientos en masa en la región Cajamarca, Norte de Perú y el deslizamiento de rodeo Pampa el 22 de febrero del 2010

    OpenAIRE

    Zavala Carrión, Bilberto; Rosado, Malena; Lu León, Samuel

    2012-01-01

    El 22 de febrero del 2010, un deslizamiento antiguo ubicado en la ladera el cerro Rodeopampa fue reactivado, produciendo el represamiento del valle de Sócota, afluente del río Marañón; afectó tierras agrícolas y algunas viviendas de Rodeopampa en el cuerpo y cabecera del deslizamiento y a San Luis de Lucma en la zona de Run up y embalse, ambas ubicadas en las provincias de Chota y Cutervo, región Cajamarca, norte de Perú. Formó un embalse de 1640 m de longitud y 400 m de ancho con una altura ...

  16. Pollution bi nitrate in the urban and rural zone of Macachins town, La Palma, Argentina; Contaminacion por nitrato en la zona urbana y rural de la localidad de Machachin, La Pampa, Argentina

    Energy Technology Data Exchange (ETDEWEB)

    Holzman, M. e.; Dalmaso, M. G.; Marno, E.

    2009-07-01

    The town of Macachin is located over the Valle Argentino aquifer. there, the phreatic aquifer is lodged in a sandy superficial cap and in the slime-sandy sediments. The objective of this work is to depict the pollution of the unconfined aquifer of Macachin, considering the presence of nitrate as determining actor of the quality of the resource. The peri urban area was analysed with the purpose of cover the area of relocalization of the sources of potable water for the town. In the urban area, the domiciliary perforations and in those os supply were considered. Samples in perforations and in drilled wells were collected. Temperature, pH, electrical conductivity and the ions concentration for nitrate and chloride were measured. Statistical basic parameters were calculated for eight wells in exploitation and also for the perforations and drilled wells. It was concluded that the conditions of the underground waters is little satisfactory. All of the domiciliary wells sampled contained a quantity of nitrate that overcomes the maximum levels allowed for the consumption of potable water. In the city's wells of supply a significant increase of the nitrate concentrations was identified since 1998, approximately. The contribution of organic matter to the underground water could be originated in the decomposition of the domiciliary wastes arranged in cesspools. In both areas, the nitrate concentrations in the unsaturated zone are similar and superior to the limit allowed for human consumption. The pollution sources in the rural zone can be permanent corrals of animals. (Author) 10 refs.

  17. Evaluation of Cortaderia selloana (Capim-dos-pampas) blankets as sorbent materials for oil spills in simulated hydro equipment; Estudo do desempenho de tecidos e mantas para utilizacao como sorventes para petroleo

    Energy Technology Data Exchange (ETDEWEB)

    Bonetti, T.F.; Sydenstricker, T.H.D. [Universidade Federal do Parana (UFPR), Curitiba, PR (Brazil)], e-mail: thais@demec.ufpr.br; Amico, S.C. [Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, RS (Brazil)

    2006-07-01

    Oil spills in aquatic environments may cause serious economy losses and severe environmental impact which both drive the development of commercial systems (e.g. sorbents) to control these accidents. One way of using sorbents is to encapsulate them with an involucre or cover, i.e. producing blankets. The focus of this research is to evaluate the key characteristics of interest (aerial density, water and oil sorption, mechanical strength and cost) of different materials to use as covers for blankets and to prepare blankets and compare their performance when made with various core materials, such as Cortaderia selloana fibers and different commercial sorbents. A simulated aqueous body with stream was used for the sorption experiments, where the oil and water phases were circulated and forced to pass under the blankets. On the sorption tests, the fibers of Cortaderia selloana reached a performance lower to that of commercial sorbents, mainly due to their low density and high volume (difficult packing), nevertheless a clear trend was noted, heavier blankets with higher sorption periods lead to higher sorption. (author)

  18. Agriculture on the pampas and familiar roles on 1960's decadeDossier: The place of the family in Argentina's agricultural production (1960-2008 Agro pampeano y roles familiares en la década de 1960

    Directory of Open Access Journals (Sweden)

    Talía Violeta Gutiérrez

    2009-01-01

    Full Text Available In the sixties of the twentieth century the pampeana's region passed through a modernization process and productive expansion that was accompanied by a higher rate urbanization of the population. This situation didn't make disappear the interest in defining the place of the family in the agricultural exploitation, instead, we propose that it was intensified and became a more complex problem. The objective of the present article is to analyze the role attributed to the family of the little or middle producer and the roles assigned to their members, in their participation in the rural development, from the State and the civil society, through the analysis of newspapers which came from these sectors.En los años sesenta del siglo XX la región pampeana vivía una etapa de modernización y expansión productiva que fue acompañada de una mayor urbanización de la población. Esta situación no significó que desapareciera el interés en definir el lugar de las familias en la explotación agrícola antes bien pensamos que se intensificó y complejizó. El objetivo del presente artículo es analizar el papel atribuido a la familia del productor pequeño o mediano y los roles asignados a sus distintos miembros, en su participación en el desarrollo rural pampeano, desde el Estado y la sociedad civil, a través del análisis de publicaciones periódicas provenientes de esos sectores.

  19. Análisis de la relación entre la producción comunitaria con el mercado de exportación de la Quinua Real, en la Marka Pampa Aullagas, del departamento de Oruro-Bolivia.

    OpenAIRE

    Churme Muñoz, Guillermo Jorge

    2014-01-01

    La presente investigación centra su análisis a la problemática de la Quinua Real en el altiplano Sur de Bolivia. En específico al tema de la producción comunitaria y el mercado de exportación de este grano. La localización del estudio se halla situada en el Municipio Autónomo de Santiago de Huari de la Provincia Sebastián Pagador en el departamento de Oruro. Para esta tarea he empleado el uso de algunas herramientas teóricas de la Sociología económica, que me han ayudado a definir los factore...

  20. Cubierta colgada en la piscina municipal de Wuppertal

    Directory of Open Access Journals (Sweden)

    Leonhardt, Fritz

    1961-02-01

    Full Text Available La gran piscina municipal de Wuppertal (Alemania, de forma en T, presenta una superficie de 40 x 65 en planta. Para cubrir esta superficie se pensó, en principio, en cubrirla con una lámina ondulada, de hormigón, de generatrices según la mínima dimensión de su proyección.

  1. Comparação de produtos de precipitação para a América do Sul Comparison of precipitation products for South America

    Directory of Open Access Journals (Sweden)

    Lucía Iracema Chipponelli Pinto

    2009-12-01

    Full Text Available Este trabalho compara cinco bancos de dados de precipitação para a América do Sul, para o período 2000 a 2004, considerando a variação meridional, a variação por diferentes bacias hidrográficas (Amazonas, Tocantins, São Francisco, Orinoco, Paraná/Prata, além das bacias dos rios da Patagônia e pelos principais tipos de vegetação (floresta tropical perene, floresta tropical semi-decídua, caatinga, cerrado e pampas. Foram utilizados três produtos provenientes da composição de dados observados com sensoriamento remoto (TRMM, CMAP e GPCP e dois de dados de reanálise (NCEP/NCAR e CPTEC. Os resultados indicam que os campos de intensidade média da precipitação anual dos diferentes produtos apresentam comportamento diferenciado entre si. Por exemplo, a reanálise do CPTEC não é capaz de representar os principais regimes de precipitação existentes no continente, demonstrando uma forte tendência em superestimar a intensidade média da precipitação no interior do nordeste brasileiro e subestimá-la na maioria das demais regiões. Os produtos que combinam dados de estações pluviométricas com os de sensoriamento remoto, mostram-se com valores bem próximos do esperado, principalmente o CMAP e GPCP.This work compares five precipitation datasets for South America, for the period 2000-2004, considering the meridional variation, the variation across the main continental watersheds (Amazonas, Tocantins, São Francisco, Orinoco, Paraná/Prata, in addition to the main Patagônia basins and across the main vegetation types (tropical evergreen forest, tropical deciduous forest, woodland, savanna and grassland/steppe. We compare three products based on a combination of rain gauge measurements and satellite data (TRMM, CMAP and GPCP and two based on reanalyzed meteorological datasets (NCEP/NCAR and CPTEC. The results indicate that the annual average precipitation fields of the different products present different behavior among them. For

  2. REHABILITACION DE SUELOS HORTÍCOLAS: IMPACTO DE PRÁCTICAS AGRÍCOLAS CON USO DE YESO Y DRENAJE

    Directory of Open Access Journals (Sweden)

    A. MUGUIRO

    2017-12-01

    Full Text Available El exceso de Na + , carbonatos y bicarbonatos presentes en el agua de riego incrementan el pH, la conductividad eléctrica (CE y el porcentaje de sodio intercambiable (PSI, afectando el crecimiento de los cultivos. El objetivo de este trabajo fue cuantifi car el impacto de prácticas de manejo con aplicación de yeso y drenaje en suelos petrocálcicos de La Pampa afectados por riego con aguas subterráneas bicarbonatadas sódicas. Se cultivó lechuga durante cuatro ciclos (500 días en dos invernáculos diferenciados por la cantidad previa de años de riego, utilizando un diseño factorial completamente aleatorizado con 4 submuestras (unidades de medición. Los tratamientos en ambos túneles (2 años=B1 y 4 años=B2 fueron: 1 T0, testigo sin tratar; 2 T1, 3,5 Mg ha -1 de yeso agrícola, 3 T2, 3,5 Mg ha -1 de yeso agrícola +  drenaje y 4 T3, drenaje. La incorporació de yeso disminuyó la concentración de Na + y PSI signifi cativamente desde superfi cie hasta 0,4 m. También mejoró signifi cativamente las condiciones físicas del suelo en el túnel B2, aspecto que se manifestó con un incremento de la productividad acumulada del cultivo de lechuga. En cambio no se encontraron diferencias signifi cativas en el  pH del suelo en ninguna de las profundidades evaluadas. Adicionalmente, la CE del suelo con los diferentes tratamientos disminuyó notablemente a partir del 2o ciclo de producción debido al incremento en la dosis de riego.

  3. Diagnostic value of positron emission tomography/computed tomography with fluorine-18 fluorodeoxyglucose in patients with differentiated thyroid gland carcinoma, high thyroglobulin serum levels and negative iodine whole body scan; Valor diagnostico da tomografia por emissao de positrons/tomografia computadorizada (PET-CT) com fluor-18 fluordeoxiglicose (FDG-{sup 18}F) em pacientes com carcinoma diferenciado da tireoide, niveis sericos de tireoglobulina elevados e pesquisa de corpo inteiro com iodo negativa

    Energy Technology Data Exchange (ETDEWEB)

    Yamaga, Lilian Yuri Itaya; Cunha, Marcelo Livorsi da; Wagner, Jairo; Thom, Annelise Fischer; Daniel, Mauro Miguel; Funari, Marcelo B. de Gusmao [Hospital Israelita Albert Einstein, Sao Paulo, SP (Brazil). Dept. de Imagem]. E-mail: itaya@einstein.br

    2007-06-15

    Purpose: To evaluate the role of PET-CT with FDG-{sup 18}F in the detection of recurrence and/or metastasis of differentiated thyroid carcinoma (DTC) in patients with elevated levels of thyroglobulin (TG) and negative whole body scan (WBS). Patients and method: PET-CT findings of 25 patients were compared to histopathology evaluation and conventional imaging (CI). Results: PET-CT scan was positive in 16 patients finding 14 true-positive and 2 false-positive cases (positive predictive value 87.5%). Nine patients had negative PET-CT; two had decrease of TG to undetectable levels. One patient had residual disease detected by post-therapeutic WBS. Six patients had no evidence of tumor during follow-up (mean time 16 months). PET-CT was concordant with CI in 52%, partially concordant in 12% and discordant in 36% (6 false-negatives and 3 false-positive of CI). We observed a tendency of increasing proportion of positive PET-CT with increasing TG. Conclusion: PET-CT scan with FDG-{sup 18}F is useful in the detection of recurrence and/or metastases of DTC with high TG levels but negative WBS. It presents elevated positive predictive value and is superior to CI being more effective as higher the serum TG levels. (author)

  4. Financial impact of outpatient clinic radioiodine therapy with sodium iodide I-131 for the treatment of patients with differentiated low-risk thyroid carcinoma in relation to hospital doses; Impacto financeiro da radioiodoterapia ambulatorial com iodeto de sódio I-131 para tratamento de pacientes com carcinoma diferenciado da tireóide de baixo risco em relação às doses hospitalares

    Energy Technology Data Exchange (ETDEWEB)

    Berenguer, P.F.; Chang, T.M.C.; Silva, R.A.M.; Neto, A.H.D.; Belo, I.B., E-mail: pricilaberenguer@gmail.com [Instituto de Medicina Integral Professor Fernando Figueira, Recife, PE (Brazil). Serviço de Medicina Nuclear; Santos, M.A.P. [Centro Regional de Ciências Nucleares do Nordeste (CRCN-NE/CNEN-PE), Recife (Brazil). Coordenação de Radioproteção

    2017-07-01

    Differential thyroid carcinoma (CDT) is the most prevalent endocrine malignancy in the world, with an excellent prognosis and a 10-year survival rate of over 95%. By 2013, the lowest activity of I-131 authorized by the Brazilian Unified Health System (SUS) in the therapy of patients with low-risk CDT was 3,700 MBq, requiring hospitalization. Recent studies have shown similar effectiveness between low and high doses of I-131 in the treatment of low-risk CDT. In 2014, the Ministry of Health included in the list of SUS procedures the use of lower activities (1,110 MBq and 1,850 MBq) for this purpose. The Brazilian National Nuclear Energy Commission (CNEN) also authorized the outpatient use of activity up to 1,850 MBq of I-131. Objective: To evaluate the financial impact of the adoption of ambulatory radioiodine therapy in patients with CDT of low-risk when compared to the hospital dose. Methods: Analysis of patients with CDT low-risk who were treated with an outpatient dose of I-131 from August / 2014 to January / 2017 at a nuclear medicine service in Recife, PE, Brazil. The cost of outpatient versus hospital doses was calculated. Results: A total of 289 patients underwent low doses of iodine therapy were evaluated, resulting in a savings of R$227,793.80. Conclusion: Outpatient radioiodine therapy in the treatment of patients with CDT of low-risk resulted in a 61.10% reduction in SUS expense, in addition to enabling faster care.

  5. Cytogenetic and dosimetric effects of {sup 131}I in lymphocyte of patients with differentiated thyroid cancer with and without r-hTSH stimulation. Study in thyroid tumor cells (WRO) treated with {sup 131}I and {sup 60}Co in vitro; Efeitos citogenetico e dosimetrico do {sup 131}I em pacientes com cancer diferenciado da tireoide com e sem estimulacao com r-hTSH. Estudo em celulas tumorais tireoidianas (WRO) tratadas com {sup 131}I e {sup 60}Co in vitro

    Energy Technology Data Exchange (ETDEWEB)

    Valgode, Flavia Gomes Silva

    2015-11-01

    Differentiated thyroid cancer (DTC) represents about 90% of thyroid malignancies with increasing incidence in the recent decades. Treatment modalities include thyroidectomy, {sup 131}I therapy (with or without r-hTSH), radio and chemotherapy. Little is known about the effects of these treatments at the cellular level. This work was proposed in order to assess to what extent radioiodine therapy can cause damage in peripheral lymphocytes of patients with DTC, preceded or not by r-hTSH, taking into account acute, slow and dosimetric effects of {sup 131}I (in vivo study). An in vitro study was also carried out on thyroid tumor target cells (WRO) by cytotoxicity and genotoxicity analysis and radioiodine uptake. For this, blood samples from patients divided into two groups (group A, r-hTSH + {sup 131}I and group B,{sup 131}I only) were collected before, 24 hours, 1 week, 1 month and 1 year after {sup 131}I administration for aberration chromosome analysis (CA). A dose-response curve for {sup 131}I in vitro was developed for estimating the absorbed dose in patients, comparing the dicentric frequencies obtained in vitro with in vivo data by Monte Carlo program. Radioiodine therapy induced an increase in the number of CA in lymphocytes of patients peaking 24 hours after treatment, with gradual decline over time and with more chromosomal damage in group B than in group A, reaching baseline levels one year after radioiodine administration. The frequency of dicentric found inpatient lymphocytes, 24h after treatment, was equivalent to that induced in vitro (0.354 ± 0.153 MBq / mL for group A and 0.309 ± 0.154 MBq / mL for group B), which corresponds to absorbed doses of 0.8 ± 0.3 Gy and 0.7 ± 0.3 Gy for groups A and B, respectively, with no significant difference between the groups. WRO cells showed a cell cycle relatively slow: 96,3h with an unstable karyotype. The genotoxic test showed a relatively high radioresistance (0.07 to 3.70 MBq/mL), with no statistical significance, with or without r-hTSH. However, the cytotoxic assay, showed a tendency to decrease at higher concentrations of 1.85 (p <0.05) and 3.70 MBq/ml (p <0.01) only in the presence of r-hTSH, coincident with the highest level of uptake. WRO cells were also relatively radioresistant to external irradiation of {sup 60}Co in the range of 0.2-8.3 Gy, with a gradual decrease in function of time for higher doses (10,20 and 40Gy).The data obtained showed little cytogenetic damage in patients upon therapeutic exposure, suggesting a safe and effective treatment for both groups of patients. Patients in group A, however, had a better quality of life by using r-hTSH. In vitro studies with internal ({sup 131}I) and external ({sup 60}Co) irradiation, with or without r-hTSH, point to the need for an alternative therapeutic strategy to overcome the loss of ability of thyroid cells (WRO) to concentrate radioiodine, which is responsible for the failure of radioiodine therapy in patients with DTC. (author)

  6. Reversed phase parallel artificial membrane permeation assay for log P measurement

    Directory of Open Access Journals (Sweden)

    Zihao Song

    2016-03-01

    Full Text Available A reversed phase parallel artificial membrane permeation assay (RP-PAMPA was newly invented for log P measurement. An oil/water/oil sandwich was constructed using a conventional PAMPA instrument. 1 % agarose was used to improve the physical stability of the water phase. A linear correlation between log P and the apparent permeability was observed in the -0.24 < log P < 2.85 region (R2 = 0.98. RP-PAMPA was also applied to pKa measurement.

  7. 76 FR 36491 - Endangered and Threatened Wildlife and Plants; Eskimo Curlew; Initiation of 5-Year Status Review

    Science.gov (United States)

    2011-06-22

    ... following summary of their life history is based on Gollop et al. (1986), unless another citation is... migrated south to wintering grounds in the Pampas of Argentina, southern Brazil, Uruguay, and Chile. There...

  8. Search Results | Page 3 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    2018-01-29

    Results 21 - 30 of 874 ... January 29, 2018. Research ... Threatened by floods, the Pampas of Argentina are vanishing. Grants and ... In response, the World Economic Forum, World Bank Group, and IDRC are building the GrowInclusive platform.

  9. Search Results | Page 15 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    2018-01-12

    Results 141 - 150 of 8502 ... Threatened by floods, the Pampas of Argentina are vanishing. ... January 12, 2018 ... based in Myanmar whose research is centered on national-level issues of democratic transition and economic development.

  10. Environmental predictors for annual fish assemblages in subtropical grasslands of South America: the role of landscape and habitat characteristics

    Czech Academy of Sciences Publication Activity Database

    Lanés, L. E. K.; Reichard, Martin; De Moura, R. G.; Godoy, R. S.; Maltchik, L.

    2018-01-01

    Roč. 101, č. 6 (2018), s. 963-977 ISSN 0378-1909 Institutional support: RVO:68081766 Keywords : Austrolebias * Cynopoecilus * killifish * temporary water s * pampas Subject RIV: EH - Ecology, Behaviour Impact factor: 1.255, year: 2016

  11. Search Results | Page 43 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    ... dynamics in the sedimentary plains of the Western Pampas (Argentina) ... Red Nacional de Agua y Saneamiento de Honduras : su dinámica y ... Desarrollo de programa sobre dinámicas territoriales rurales : informe final del proyecto.

  12. Publications | Page 83 | IDRC - International Development Research ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Results 821 - 830 of 7327 ... ... most relevant global grain suppliers of South America, the fast expansion of crops over pastures (Pampas... Making Evaluation Matter: Writings from South Asia ... Research improves secure access to nutritious food.

  13. Inondations, sécheresses et agriculture dans les plaines de la ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    La Pampa argentine et le Chaco paraguayen comptent parmi les plus grands fournisseurs mondiaux de grains en Amérique du Sud. L'expansion rapide des cultures au détriment des pâturages (Pampa) et des forêts (Chaco) ainsi que les changements climatiques et la topographie extrêmement plate font en sorte que ces ...

  14. El productor silencioso: destino del gran actor de la modernización de los años 1960-70 en la actual copresencia de agriculturas de la región pampeana argentina // The silent farmer: destiny of the great actor of the modernization of the years 1960–70 in the current copresence of agricultures in the Argentina Pampa

    Directory of Open Access Journals (Sweden)

    Christophe Albaladejo

    2017-12-01

    Full Text Available En la región pampeana argentina, pese a las declaraciones de muchos actores y afirmaciones en la literatura, estimamos que el modelo de agricultura del agribusiness representado por los “nuevos productores” de la soja no puede ser considerado como una profundización del modelo de modernización anterior, de los años 1960-70, sino que debe ser entendido como un proceso nuevo en ruptura con dicha modernización. ¿Cuál es entonces el destino de los actores que eran la base del modelo de modernización anterior y en particular del productor moderno convencional? Surgió paralelamente al agribusiness, y desde los años 2000, un nuevo sujeto social en lo rural argentino: el “productor familiar”. Pero ninguno de los dos sujetos, agricultor familiar y agribusiness, representa lo esencial del productor “moderno” autónomo que estuvo en el centro de la modernización “clásica” de los años 1960-70.  En este trabajo mostramos el carácter heurístico de centrar el foco de la atención sobre el destino de la base social de la modernización anterior, y la importancia oculta de su rol actual en los territorios y el agro, pese a su repentina desaparición de los discursos y de las representaciones sociales, así como de las políticas públicas.

  15. Temperaturas de quema y propiedades físicas y químicas de suelos de la Región Semiárida Pampeana Central Impact of different burning temperatures on the physical and chemical properties of Central Semiarid Pampa soils

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    Estela Hepper

    2008-07-01

    Full Text Available Los fuegos controlados y naturales son frecuentes en el Caldenal, en la Región Semiárida Pampeana Central, y sus efectos sobre propiedades físicas y químicas de los suelos son poco conocidos. El objetivo de este trabajo fue detectar las temperaturas de quema que producen cambios en algunas propiedades físicas y químicas del suelo en el Caldenal. Dos Haplustoles énticos, uno franco arenoso y otro franco fueron calentados durante 5 minutos a 100 ºC, 200 ºC, 300 ºC, 400 ºC, 500 ºC y 600 ºC. Sobre las muestras de suelo sin tratar y las sometidas a las diferentes temperaturas se determinó pH en agua, textura, carbono orgánico, nitrógeno total, cationes intercambiables y capacidad de intercambio catiónico. Las temperaturas de quema a las que se produjeron mayores modificaciones fueron 500 ºC y 600 °C, detectándose disminuciones del contenido de carbono orgánico, nitrógeno total, de la relación de ambos, de la capacidad de intercambio catiónico y la transformación del suelo franco en franco arenoso y del franco arenoso en arenoso franco. Los contenidos de potasio y sodio intercambiables aumentaron a partir de 300 ºC y 400 ºC según el suelo, mientras que en ambos el contenido de magnesio disminuyó a partir de 400 ºC y el de calcio no fue afectado a ninguna temperatura. A menores temperaturas, 200 ºC y 300 ºC, sólo se afectaron las proporciones de las fracciones de arena. Como consecuencia de una quema a altas temperaturas disminuirá la capacidad de retención de agua y de nutrientes de estos suelos, con la consecuente pérdida de fertilidad.The natural and controlled burns are very frequent in the Caldenal area, located in the Central Semiarid Pampean Region, and the effects they produce on the physical and chemical properties of the soils are not well-known. The aim of this study was to find out the burning temperatures that produce changes in soil physical and chemical properties in the Caldenal area. Two Entic Haplustolls (loam and sandy loam, were heated during 5 minutes at 100 ºC, 200 ºC, 300 ºC, 400 ºC, 500 ºC and 600 ºC. Ph in water, texture, organic carbon, total nitrogen, exchangeable cations and cation exchange capacity were determined on soil samples that received heat and on untreated controls. The 500 and 600 ºC burning temperatures produced more changes, decreasing the organic carbon contents, total nitrogen, the OC/Nt ratio, the cation exchange capacity and causing the transformation of the loam soil into sandy loam and of the sandy loam into loamy sand soil. The exchangeable potassium and sodium contents increased with burning temperatures of 300 ºC and 400 ºC and greater, depending on the soil, but in both of them the magnesium content decreased from 400 ºC and greater, and the calcium content was not affected by high temperatures. At lower temperatures, such as 200 ºC and 300 ºC, only the proportions of sand fractions changed. As a consequence of burning with high temperatures, the water and nutrient retention capacity of the Caldenal area soils will decrease, concomitantly with the fertility.

  16. Helmintos do cachorro do campo, Pseudalopex gymnocercus (Fischer, 1814 e do cachorro do mato, Cerdocyon thous (Linnaeus, 1766 no sul do estado do Rio Grande do Sul, Brasil Helminths of Pampas fox Pseudalopex gymnocercus (Fischer, 1814 and of Crab-eating fox Cerdocyon thous (Linnaeus, 1766 in the Southern of the State of Rio Grande do Sul, Brazil

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    Jerônimo L. Ruas

    2008-06-01

    Full Text Available Quarenta canídeos selvagens foram capturados por "live trap" nos municípios de Pedro Osório e Pelotas, sul do estado do Rio Grande do Sul e transportados para o Laboratório de Parasitologia da Universidade Federal de Pelotas. Após serem necropsiados, segmentos do intestino, respiratório, urinário e fígado foram separados e examinados. Os crânios dos animais foram usados para identificação taxonômica. Dos 40 animais capturados, 22 (55% foram Pseudalopex gymnocercus e 18 (45% Cerdocyon thous. Os nematóides mais prevalentes foram: Ancylostoma caninum (45,4 em P. gymnocercus e 22,2% em C. thous, Molineus felineus (9,9 em P. gymnocercus e 5,6% em C. thous, Strongyloides sp. (22,7 em P. gymnocercus e 16,7% em C. thous, Trichuris sp. (13,6 em P. gymnocercus e 11,1% em C. thous, e Capillaria hepatica (13,6 em P. gymnocercus e 5,5 % em C. thous. Os trematódeos observados foram: Alaria alata (50,0% em C. thous e 36,4 em P. gymnocercus, e Asthemia heterolecithodes em 5,6% dos C. thous. Cestóides foram identificados como Spirometra sp. (61,1% em C. thous e 54,5 em P. gymnocercus, Diphyllobothriidae (81,8 em P. gymnocercus e 77,8% em C. thous, e Acantocephala do gênero Centrorhynchus foi observado somente em 5,6% dos C. thous. Estes resultados indicaram a helmintofauna de canídeos selvagens nas áreas estudadas.Forty wild canids were captured by live trap at Municipalities of Pedro Osorio and Pelotas in Southern of the State of Rio Grande do Sul and they were transported to the Parasitology Laboratory at the Universidade Federal de Pelotas. After they were posted, segments of intestinal, respiratory and urinary tracts and liver were separated and examined. Animal skulls were used for taxonomic identification. Of forty wild animals trapped, 22 (55% were Pseudalopex gymnocercus and 22 (55% Cerdocyon thous. The most prevalent nematodes were: Ancylostoma caninum (45.4 in P. gymnocercus and 22.2% in C. thous, Molineus felineus (9.9 in P. gymnocercus and 5.6% in C. thous, Strongyloides sp. (22.7 in P. gymnocercus and 16.7% in C. thous, Trichuris sp. (13.6 in P. gymnocercus and 11.1% in C. thous, and Capillaria hepatica (13.6 in P. gymnocercus and 5.5 % in C. thous. The trematodes observed were: Alaria alata (36.4 in P. gymnocercus and 50.0% in C. thous, and Asthemia heterolecithodes in 5.6% C. thous. Cestodes were identified as Spirometra sp. (61.1 % in C. thous and 54.5 in P. gymnocercus, Diphyllobothriidae, (81.8 in P. gymnocercus and 77.8 % in C. thous and an Acantocephala of the genus Centrorhynchus was also observed in 5.6% of C. thous only. These results indicated the helminths fauna in wild canids from the studied area.

  17. La ciudadanización del «indio bárbaro». Políticas oficiales y oficiosas hacia la población indígena de la Pampa y la Patagonia, 1870-1920

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    Quijada, Mónica

    1999-12-01

    Full Text Available This article analyzes the ways in which «the indigenous problem» was dealt with as a consequence of the military occupation of a huge territory which till then had been inhabited by Indians who were independent from the authority of the central state. It focuses on the complex visions about the Indian and shows that a series of land policies and initiatives destined to the integration of the indigenous population were launched, with the aim to define the place that the submitted Indians should take in the framework of the Argentinian nation-building process. A further argument is about the conditions for the conversion of Indians into citizens in the framework of the Argentinian conceptualization of the nation, which was strictly territorial.

    En este trabajo se aborda el problema del tratamiento del tema indígena en la Argentina, en el último cuarto del siglo XIX y principios del XX, a partir de la ocupación militar de los extensos territorios hasta entonces habitados por indígenas no sometidos. En él se analiza la complejidad de las visiones sobre el indígena y su estadio de civilización, y se demuestra la existencia de una política de concesión de tierras y la puesta en marcha de una serie de iniciativas destinadas a la integración de un colectivo que, lejos de haber desaparecido como saldo de la campaña militar, fue el objeto de preocupaciones oficiales y oficiosas destinadas a definir el lugar que los aborígenes vencidos debían ocupar en la nacionalidad que se estaba construyendo. Se argumentan asimismo las condiciones de la conversión de los indios en ciudadanos en el marco del concepto estrictamente territorial de nación que fue característico de la construcción nacional argentina.

  18. RESEÑAS BIBLIOGRÁFICAS: Mariana Dantas y Germán G. Figueroa. 2008. Análisis tecnológico y funcional del registro cerámico del Valle de Salsacate y pampas de altura adyacentes (provincia de Córdoba, República Argentina

    Directory of Open Access Journals (Sweden)

    Mariana Fabra

    2009-12-01

    Full Text Available En las últimas décadas, el estudio de la tecnología de producción cerámica ha sido encarado desde distintas perspectivas, las cuales han permitido abordar cuestiones vinculadas a la reconstrucción de técnicas de manufactura, indagar acerca del rol y el significado de la tecnología en diversas sociedades, las relaciones entre estrategias tecnológicas y organización socioeconómica, así como las implicancias sociales y políticas de los cambios tecnológicos (Longacre, 1999:44. Asimismo, las características que presenta la producción alfarera brindan información sobre los sistemas sociales, políticos y económicos en los que se encuentra implicada (Costin, 1991:2. Algunos aspectos del proceso de producción pueden dar pautas para comprender la organización de la producción, entre ellos, la distribución de las materias primas, la naturaleza de la tecnología, y la destreza y entrenamiento de los productores. Otros estudios se han focalizado en el surgimiento de ciertas formas de organización (especialización en lugar de explicar la organización de la producción en general.En numerosas oportunidades, el grado de complejidad tecnológica fue utilizado como evidencia de un tipo particular de organización de la producción o del grado de complejidad organizativa a nivel social: la ausencia de sofisticación tecnológica o de inversión artesanal fue sugerida como evidencia de producción a tiempo parcial y a pequeña escala, mientras otras industrias son vistas como inherentemente especializadas (por ejemplo, la metalurgia y de producción de tiempo completo, a causa de su evidente complejidad.

  19. Las formas del salario en la agricultura pampeana: su rol en el disciplinamiento, el aumento de la productividad y el abaratamiento de la fuerza de trabajo The forms of the salary in the pampas agriculture: its role to disciplin, improve productivity and cheapen the workforce

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    Juan Manuel Villulla

    2012-01-01

    Full Text Available Las transformaciones socio-económicas, políticas y gremiales acaecidas a fines de los ´70 inauguraron un período desfavorable para las condiciones de trabajo de los obreros agrícolas. Se desarrolló una tendencia hacia la disminución de los tiempos requeridos por cada tarea, la discontinuación del proceso productivo, la estacionalización de la demanda de empleo y una mayor especialización de la fuerza de trabajo. La fragmentación extrema del proceso productivo derivó así en el astillamiento del ciclo laboral de los trabajadores en términos de ingresos y de empleadores. En este contexto, fueron logrando imponerse y naturalizarse distintas formas y niveles de remuneración para cada una de las tareas agrícolas, aun en los casos en que un trabajador las realizara todas para un mismo patrón como peón permanente, y singularmente en los casos de los obreros temporarios que se enfrentan a distintos empleadores para desarrollar cada una de las labores con las que construyen su ciclo laboral. Nos proponemos analizar el rol que la combinación de estas formas y niveles salariales ha venido cumpliendo para el abaratamiento de la fuerza de trabajo agrícola en su conjunto, así como en su estímulo a una mayor productividad y en la frustración de conflictos abiertos o a gran escala entre esta fracción de la clase obrera rural y sus patrones, a pesar de las condiciones de trabajo desfavorables que verificamos en este estudioThe socio-economic, political and labour union transformations followed in the late 70´s, started an adverse period for the work conditions of the agricultural employees. There was a trend developed towards the decrease of the times required for each task, the discontinuation of the productive process, a more seasonable demand of employment, and an increase of the specialization of the workforce. The extreme fragmentation of the productive process derived this way in the splinter of the worker´s labour cycle in terms of incomes and employers. In this context, it was possible to impose and naturalize different forms and levels of remuneration for each one of the agricultural tasks, still in the cases in which a worker realized all of them for the same boss as a permanent labourer, and singularly in the cases of temporary workers who face different employers to develop each task to build their occupational cycle. We propose to analyze the role that this combination of wage forms and levels has been playing for the cheapen of the agricultural workforce, as well as an encouragment to a major productivity and in the abortion of opened or large-scale conflicts between this fraction of the rural working class and his bosses, in spite of the adverse conditions of work that we check in this study

  20. The Payun-Matru lava field: a source of analogues for Martian long lava flows

    Science.gov (United States)

    Giacomini, L.; Pasquarè, G.; Massironi, M.; Frigeri, A.; Bistacchi, A.; Frederico, C.

    2007-08-01

    The Payun Matru Volcanic complex is a Quaternary fissural structure belonging to the back-arc extensional area of the Andes in the Mendoza Province (Argentina). The eastern portion of the volcanic structure is covered by a basaltic field of pahoehoe lava flows advanced over more than 180 km from the fissural feeding vents that are aligned with a E-W fault system (Carbonilla fault). Thanks to their widespread extension, these flows represent some of the largest lava flows in the world and the Pampas Onduladas flow can be considered the longest sub-aerial individual lava flow on the Earth surface [1,2]. These gigantic flows propagated over the nearly flat surface of the Pampean foreland, moving on a 0.3 degree slope. The very low viscosity of the olivine basalt lavas, coupled with the inflation process and an extensive system of lava tubes are the most probable explanation for their considerable length. The inflation process likely develop under a steady flow rate sustained for a long time [3]. A thin viscoelastic crust, built up at an early stage, is later inflated by the underlying fluid core, which remains hot and fluid thanks to the thermal-shield effect of the crust. The crust is progressively thickened by accretion from below and spreading is due to the continuous creation of new inflated lobes, which develop at the front of the flow. Certain morphological features are considered to be "fingerprints" of inflation [4, 5, 6]; these include tumuli, lava rises, lava lobes and ridges. All these morphologies are present in the more widespread Payun Matru lava flows that, where they form extensive sheetflows, can reach a maximum thickness of more than 20 meters. After the emplacement of the major flows, a second eruptive cycle involved the Payun Matru volcanic structure. During this stage thick and channelized flows of andesitic and dacitic lavas, accompanied the formation of two trachitic and trachiandesitic strato-volcanoes (Payun Matru and Payun Liso) culminated

  1. Representaciones Sociales de la Historia Universal: Posicionamientos Diferenciales en Función de la Ideología Política, Religiosidad y Nacionalismo en una Muestra Argentina/RepresentationsSocial Representations of Universal History: Differential Positioning at the Service of Political Ideology, Religiosity and Nationalism in the Argentinian Context/Representações Sociais da História Universal: Posicionamentos Diferenciados em função da Ideologia Política, da Religiosidade e do Nacionalismo numa Amostra Argentina

    Directory of Open Access Journals (Sweden)

    Fernanda Mariel Sosa

    2016-03-01

    Full Text Available Con el objetivo de analizar las representaciones sociales de la historia a través de los sentimientos que despiertan 24 personajes de la historia universal, se administró una versión modificada del cuestionario construido por Liu et al. (2005 a una muestra intencional (n=369 de Argentina (55.7% mujeres, medad=36.20, deedad=11.16. El análisis de conglomerados no jerárquico arrojó 4 grupos en función de la religiosidad, el nacionalismo y el posicionamiento ideológico de los participantes. Por su parte, del análisis de clúster jerárquico, en función de los sentimientos hacia los personajes, se desprendieron 2 conglomerados denominados héroes y villanos. Los personajes religiosos y políticos son los que mayor disenso suscitan.

  2. A modified parallel artificial membrane permeability assay for evaluating the bioconcentration of highly hydrophobic chemicals in fish.

    Science.gov (United States)

    Kwon, Jung-Hwan; Escher, Beate I

    2008-03-01

    Low cost in vitro tools are needed at the screening stage of assessment of bioaccumulation potential of new and existing chemicals because the number of chemical substances that needs to be tested highly exceeds the capacity of in vivo bioconcentration tests. Thus, the parallel artificial membrane permeability assay (PAMPA) system was modified to predict passive uptake/ elimination rate in fish. To overcome the difficulties associated with low aqueous solubility and high membrane affinity of highly hydrophobic chemicals, we measured the rate of permeation from the donor poly(dimethylsiloxane)(PDMS) disk to the acceptor PDMS disk through aqueous and PDMS membrane boundary layers and term the modified PAMPA system "PDMS-PAMPA". Twenty chemicals were selected for validation of PDMS-PAMPA. The measured permeability is proportional to the passive elimination rate constant in fish and was used to predict the "minimum" in vivo elimination rate constant. The in vivo data were very close to predicted values except for a few polar chemicals and metabolically active chemicals, such as pyrene and benzo[a]pyrene. Thus, PDMS-PAMPA can be an appropriate in vitro system for nonmetabolizable chemicals. Combination with metabolic clearance rates using a battery of metabolic degradation assays would enhance the applicability for metabolizable chemicals.

  3. Selection, isolation, and identification of fungi for bioherbicide production

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    Angélica Rossana Castro de Souza

    Full Text Available Abstract Production of a bioherbicide for biological control of weeds requires a series of steps, from selection of a suitable microbial strain to final formulation. Thus, this study aimed to select fungi for production of secondary metabolites with herbicidal activity using biological resources of the Brazilian Pampa biome. Phytopathogenic fungi were isolated from infected tissues of weeds in the Pampa biome. A liquid synthetic culture medium was used for production of metabolites. The phytotoxicity of fungal metabolites was assessed via biological tests using the plant Cucumis sativus L., and the most promising strain was identified by molecular analysis. Thirty-nine fungi were isolated, and 28 presented some phytotoxic symptoms against the target plant. Fungus VP51 belonging to the genus Diaporthe showed the most pronounced herbicidal activity. The Brazilian Pampa biome is a potential resource for the development of new and sustainable chemical compounds for modern agriculture.

  4. Short report: serologic evidence of human ehrlichiosis in Peru.

    Science.gov (United States)

    Moro, Pedro L; Shah, Jyotsna; Li, Olga; Gilman, Robert H; Harris, Nick; Moro, Manuel H

    2009-02-01

    A serosurvey for human ehrlichiosis caused by Ehrlichia chaffeensis and Anaplasma phagocytophilum was performed in different regions of Peru by using indirect immunofluorescence assays (IFAs). Regions included an urban community in a shantytown in Lima (Pampas) and three rural communities located on the northern coast of Peru (Cura Mori), in the southern Peruvian Andes (Cochapata), and in the Peruvian jungle region (Santo Tomas). An overall E. chaffeensis seroprevalence of 13% (21 of 160) was found by IFA. Seroprevalences in females and males was 15% (16 of 106) and 9% (5 of 53), respectively. Seroprevalences in Cura Mori, Cochapata, Pampas, and Santo Tomas were 25% (10 of 40), 23% (9 of 40), 3% (1 of 40), and 3% (1 of 40), respectively. Seroprevalences in Cura Mori and Cochapata were significantly higher than in Santo Tomas or Pampas (P Peru. Further studies are needed to characterize Ehrlichia species in Peru, their vectors and their clinical significance.

  5. Riesgo de anegamiento: estimaciones para la Cuenca Baja del Río Salado Flooding risk in the Salado River Basin

    OpenAIRE

    Pablo Mauricio Vázquez; Fabián Néstor Cabria; María Del Carmen Rojas; Mirta Beatriz Calandroni

    2009-01-01

    Está documentado que de 1986 al 2001 se incrementó en un 69% el área cultivada en sectores de la Pampa Deprimida, y que el avance agrícola se realizó sobre tierras que cíclicamente fueron afectadas por excesos de agua (anegamiento o inundación). Con el propósito de auxiliar la planificación y el ordenamiento de actividades agropecuarias en tierras de la Pampa Deprimida, nos propusimos generar información que denote el riesgo de anegamiento o inundación. Para alcanzar este objetivo se calculó ...

  6. Comunidad de escarabajos copronecrófagos (Coleoptera: Scarabaeidae en dos bosques del Chaco Oriental Húmedo, Argentina Copro-necrophagous beetle community (Coleoptera: Scarabaeidae in two forests from Eastern Humid Chaco, Argentina

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    Miryam P. Damborsky

    2008-06-01

    Full Text Available Se investigó y comparó la estructura de la comunidad de Scarabaeinae en dos ambientes con distinto grado de conservación. Se efectuaron muestreos en un bosque nativo del Parque Provincial Pampa del Indio y en un fragmento de bosque del establecimiento ganadero Los Alisos. Los ejemplares se capturaron con coprotrampas y necrotrampas que permanecieron activas durante 72 horas, en los meses de octubre, noviembre y diciembre de 2006. Se colectaron 769 individuos adultos pertenecientes a seis tribus, 11 géneros y 26 especies. En Los Alisos Ontherus sulcatus Fabricius y Onthophagus hirculus Mannerheim resultaron dominantes. Trichillum sp., Canthon podagricus Harold, Malagoniella sp., Gromphas lacordairei Brullé, y dos especies de Dichotomius Hope fueron exclusivas de este establecimiento. Canthon septemmaculatus Latreille y Coprophanaeus jasius Olivier sólo se colectaron en Pampa del Indio. El número de individuos y la diversidad alcanzaron valores significativamente superiores en Pampa del Indio. En Los Alisos, se constató igual proporción de coprófagos y necrófagos, y una mayoría de especies con hábitos endocópridos y paracópridos. En Pampa del Indio, se encontraron más especies de hábitos necrófagos y rodadores. La presente contribución constituye el primer estudio sobre la biodiversidad de Scarabaeinae en el ambiente de bosque de la provincia del Chaco.Scarabaeinae community structure was compared in two habitats with different degrees of conservation: a native forest at Pampa del Indio Provincial Park, and a forest fragment at Los Alisos cattle farm. Pitfall traps baited with carrion and cattle dung were left open for 72-hour periods in October, November and December 2006. 769 adults belonging to six tribes, 11 genera and 26 species were captured in all. At Los Alisos, Ontherus sulcatus Fabricius and Onthophagus hirculus Mannerheim were the dominant species. Trichillum sp., Canthon podagricus Harold, Malagoniella sp., Gromphas

  7. public policies, family farming, food security, food sovereignty, Argentina.

    Directory of Open Access Journals (Sweden)

    Gabriela Martinez Dougnac

    2015-04-01

    Full Text Available This article analyses on an historic perspective the developement of family farming in the humid pampas attending to the changes on it since the growth of the agrarian capitalism. Although we recognize the historic meaning of the family farmer in the region, the "chacarero" of the pampas, we stress with some statistics and regional singularities the success of the decomposition process of this kind of productive unities, mainly duirng the last decades, in which the survivance of the family farmers became more difficult.

  8. Clasificación automática para la prevención del estrés de los suelos y la fatiga de soja en el noroeste argentino

    OpenAIRE

    Sanson, E.; Britos, Paola Verónica; Rodríguez, D.; García Martínez, Ramón

    2009-01-01

    El crecimiento de la soja y sus derivados en la Argentina en los últimos 30 años se ha constituido en un fenómeno trascendente y fundamental para el país, tanto desde el punto de vista económico como social. Para la campaña 2002/03, la soja representó más del 50% del total de los granos producidos, considerando los cinco cultivos mas difundidos en la pampa húmeda. Lo anterior implica que el sector agropecuario, especialmente en la pampa húmeda, ha tornado hacia un modelo de "especialización s...

  9. Floods, Droughts and Farming on the Plains of Argentina and ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    2015-04-01

    Floods, Droughts and Farming on the Plains of Argentina and Paraguay, Pampas and Chaco Regions ... End Date. April 1, 2015 ... Argentina, South America, Paraguay, North and Central America ... IDRC is now accepting applications for this year's IDRC Doctoral Research Awards (IDRA). ... Careers · Contact Us · Site map.

  10. Change effects in the land use about the mineral clay

    International Nuclear Information System (INIS)

    Cespedes Payret, C.; Gutierrez, O; Panario, D.; Pineiro, G

    2012-01-01

    The Pampas land changes during the Quaternary, left their mark on the mineralogy of soil clays. This work is oriented to compare the mineralogical composition of the clays and the value of potassium in an eucalyptus forestation. These results show that the mineralogical illite alteration is the cause of its destruction. This clay is the main reservoir of potassium for the agricultural soils

  11. New Flurbiprofen Derivatives: Synthesis, Membrane Affinity and Evaluation of in Vitro Effect on β-Amyloid Levels

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    Stephanie Pacella

    2013-09-01

    Full Text Available Alzheimer’s disease (AD is characterized by irreversible and progressive loss of memory and cognition and profound neuronal loss. Current therapeutic strategies for the treatment of AD have been directed to a variety of targets with the aim of reversing or preventing the disease but, unfortunately, the available treatments often produce no significant clinical benefits. During the last decades compounds that inhibit or modulate γ-secretase, reducing β amyloid (Aβ levels, have been considered as potential therapeutics for AD. Among these the (R-enantiomer of flurbiprofen (FLU seems to be very promising, but it shows low brain penetration. In this study, in order to improve the properties of FLU against Alzheimer’s pathogenesis we synthesized some novel FLU lipophilic analogues. Lipophilicity of the new molecules has been characterized in terms of clogP, log KC18/W and log K IAM/W values. Permeability has been determined in both gastrointestinal PAMPA (PAMPA-GI at different pH values and in brain blood barrier PAMPA (PAMPA-BBB models. They were also tested for their ability to inhibit in vitro γ-secretase activity using rat CTXTNA2 astrocytes. Interestingly, the investigated molecules demonstrated to reduce Aβ 42 levels without affecting the amyloid precursor protein APP level in a clear concentrations-dependent manner.

  12. Comunidad de escarabajos copronecrófagos (Coleoptera: Scarabaeidae en dos bosques del Chaco Oriental Húmedo, Argentina

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    Miryam P. DAMBORSKY

    2008-01-01

    Full Text Available Se investigó y comparó la estructura de la comunidad de Scarabaeinae en dos ambientes con distinto grado de conservación. Se efectuaron muestreos en un bosque nativo del Parque Provincial Pampa del Indio y en un fragmento de bosque del establecimiento ganadero Los Alisos. Los ejemplares se capturaron con coprotrampas y necrotrampas que permanecieron activas durante 72 horas, en los meses de octubre, noviembre y diciembre de 2006. Se colectaron 769 individuos adultos pertenecientes a seis tribus, 11 géneros y 26 especies. En Los Alisos Ontherus sulcatus Fabricius y Onthophagus hirculus Mannerheim resultaron dominantes. Trichillum sp., Canthon podagricus Harold, Malagoniella sp., Gromphas lacordairei Brullé, y dos especies de Dichotomius Hope fueron exclusivas de este establecimiento. Canthon septemmaculatus Latreille y Coprophanaeus jasius Olivier sólo se colectaron en Pampa del Indio. El número de individuos y la diversidad alcanzaron valores significativamente superiores en Pampa del Indio. En Los Alisos, se constató igual proporción de coprófagos y necrófagos, y una mayoría de especies con hábitos endocópridos y paracóprido En Pampa del Indio, se encontraron más especies de hábitos necrófagos y rodadores. La presente contribución constituye el primer estudio sobre la biodiversidad de Scarabaeinae en el ambiente de bosque de la provincia del Chaco.

  13. Climate Change | Page 6 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    Home · Agriculture and Environment. Climate Change. Language English. Read more about Floods, Droughts and Farming on the Plains of Argentina and Paraguay, Pampas and Chaco Regions. Language English. Read more about Using ICTs to Address Water Challenges in Uganda. Language English. Read more ...

  14. Sudden death syndrome of soybean in Argentina

    Science.gov (United States)

    Sudden death syndrome (SDS) is one of the most common and widely spread root disease affecting soybean [Glycine max (L.) Merr.] in Argentina where it is an economically important crop. This disease was first discovered in this country in 1992 in the Pampas Region, and the following year in Northwest...

  15. All projects related to | Page 280 | IDRC - International Development ...

    International Development Research Centre (IDRC) Digital Library (Canada)

    2011-10-01

    The Pampas in Argentina and Chaco in Paraguay constitute one of South America's most important global grain suppliers. Start Date: October 1, 2011. End Date: April 1, 2015. Topic: Climate change, ADAPTATION TO CHANGE, DROUGHT, FLOODS, HYDROLOGY, AGRICULTURAL LAND, CULTIVATED LAND, LAND ...

  16. Cooperation on Water management issues, Argentina : Project in the framework of Bilateral Cooperation between Argentina and the Netherlands : Case studies on water management issues in Argentina

    NARCIS (Netherlands)

    Querner, E.P.; Morabito, J.A.; Rebori, G.

    2007-01-01

    In Argentina parts of the country have problems encountered from too much water or suffer serious water shortages. The Humid Pampas encounter an increased rainfall since the 1970’s. In Mendoza Province water resources are limited and all the water from the rivers is used for agriculture, drinking

  17. Land use changes after the period commodities rising price in the Rio Grande do Sul State, Brazil

    Directory of Open Access Journals (Sweden)

    Vicente Celestino Pires Silveira

    Full Text Available ABSTRACT: At the end of the 20th and early 21st century, agricultural systems incorporated definitively a new mission: to generate goods for a world population that continues to grow and whose way of life demand food with low environmental impact. Soybean is the main raw material for the production of biodiesel in Brazil, accountably responsible for 82.4% of the total produced between 2006 and 2013. The Brazilian state of Rio Grande do Sul (RS, which is formed by the Pampa and the Atlantic forest biomes, was responsible for 35.7% of the country's biodiesel production in the referred period. The aim of this paper was to verify the impact of the increased area of soybean cultivation in land use in Rio Grande do Sul State, in the period between 1990 and 2015, considering separately its two biomes (Pampa and Atlantic Forest original areas, using both census dataset and satellite images. We used the period from 1990 to 2000 as before commodity rising price (BCRP and the period from 2000 to 2013 as commodity rising price (CRP. The 505,162 ha from Atlantic Forest biome and 1,192,115ha from Pampa biome were added to soybean production in the CRP period. In the Atlantic Forest, this enlargement occurred in the border of the main production area, while in Pampa biome conversion of natural grassland to crop land was the main reason for the large increment in the cultivated area.

  18. The Role of Stat3 Activation During Prostate Cancer Progression

    Science.gov (United States)

    2007-11-01

    Cause of Mastitis in Bovines of the Province of La Pampa, Argetina” Department of Microbiology and Immunology, School of Veterinary Medicine, National...by Intradermo-Reaction in Bovines .” Sagardoy, M.; Oriani, D.S.; Toso, R.; Alvarez Rubianes, N.; Bruni, M.; Filipino, S.; Cachou, P.; Blando, J.M

  19. First record of Lophodinium polylophum (Daday Lemmermann 1910 (Dinophyceae: Lophodiniaceae in Peru

    Directory of Open Access Journals (Sweden)

    Iris Samanez

    2015-04-01

    Full Text Available Herein, the first record of Lophodinium polylophum from Peru is presented. This fresh water dinoflagellate was identified in plankton samples from the lagoon Picoplancha of Santuario Nacional Pampas del Heath (Madre de Dios and from a stream in the Puinahua River basin in Loreto.

  20. Using the theory of planned behavior to identify key beliefs underlying Brazilian cattle farmers' intention to use improved natural grassland

    NARCIS (Netherlands)

    Rossi Borges, Joao; Tauer, Loren Willian; Oude Lansink, Alfons

    2016-01-01

    In biome Pampa, Brazil, cattle farmers have managed the natural grasslands using practices that result in overgrazing, low productivity and low farm income. In addition, farmers in the region converted natural grasslands from beef production to more profitable activities, such as cash crops. This

  1. Remediation of feedlot effluents using aquatic plants

    OpenAIRE

    Rizzo, Pedro Federico; Arreghini, Silvana; Serafini, Roberto José María; Bres, Patricia Alina; Crespo, Diana Elvira; Fabrizio de Iorio, Alicia Rosa

    2012-01-01

    Feedlots have increased in several regions of Argentina, particularly in the Pampas. The absence of adequate treatments of the effluents produced in these establishments creates serious problems to the society. Phytoremediation can be defined as inexpensive and environmentally sustainable strategy used to remove pollutants by plants. The aim of this study was to evaluate the remediation potential of two ...

  2. Marketing de produtos de luxo : simbolismo, marcas e estratégias

    OpenAIRE

    Barth, Célia Amaral Souza Marengo

    2010-01-01

    Trata-se de revisão bibliográfica sobre produtos e serviços de luxo, a fim de verificar como as empresas adotam estratégias para diferenciação de seus produtos, utilizando ferramentas de um marketing diferenciado e construindo uma imagem de marca adequada

  3. 1 Estudio Sectorial Sector lácteo de Argentina

    International Development Research Centre (IDRC) Digital Library (Canada)

    Resumen: La producción de leche y productos lácteos conforma en Argentina un importante complejo productivo, de larga trayectoria histórica y gran impacto económico y social. En Argentina, esta industria conforma un oligopolio diferenciado en el que coexisten unas pocas grandes empresas nacionales y ...

  4. Isotope hydrology and geochemistry of northern Chile groundwaters

    Directory of Open Access Journals (Sweden)

    1995-01-01

    Full Text Available HYDROLOGIE ISOTOPIQUE ET GEOCHIMIE DES EAUX SOUTERRAINES DU NORD CHILI. Cet article est un résumé des études de caractérisation d’aquifères situés dans la Pampa del Tamarugal et du Salar de Atacama au nord du Chili à l’aide d’isotopes. Les objectifs principaux de ces études étaient d’obtenir de l’information sur l’origine et le temps de résidence des eaux souterraines, la qualité des eaux, les taux d’évaporation des salars et la relation entre les inondations et la recharge des aquifères. Les principales conclusions de ces études sont les suivantes: a la majorité de l’eau souterraine est de bonne qualité à l’exception des zones situées près des salars b un système multi-aquifère a été identifié dans le bassin de la Pampa del Tamaragual en relation avec des zones de recharges situées à différentes altitudes et c une importante portion des eaux souterraines dans les aquifères de la Pampa devraient êtres considérées comme une ressource non renouvelable. HIDROLOGÍA ISOTÓPICA Y GEOQUÍMICA DE LAS AGUAS SUBTERRÁNEAS DEL NORTE DE CHILE. En este trabajo se presenta un resumen de estudios que se han realizado en el Norte de Chile, en acuíferos localizados en la Pampa del Tamarugal y en el Salar de Atacama. Los principales objetivos de esos estudios fueron obtener información sobre el origen y el tiempo de residencia del agua subterránea, calidad química del agua, tasas de evaporación desde los salares y evaluar la relación entre inundaciones y recarga a los acuíferos. Las principales conclusiones de estos estudios fueron las siguientes: a la mayoría del agua subterránea es de buena calidad, con la excepción de las áreas cercanas a los salares b se identificó en la cuenca de la Pampa del Tamarugal un sistema de multiacuífero relacionado a áreas de recargas localizadas en diferentes altitudes c una parte importante del agua subterránea en la Pampa del Tamarugal tiene que ser tratada como un recurso

  5. Aplicación de un índice de calidad ambiental a la región Pampeana Argentina (2010

    Directory of Open Access Journals (Sweden)

    Guillermo Ángel Velázquez

    2011-09-01

    Full Text Available The application of an environmental quality index to the Pampa s region in the Republic of Argentina (2010. In this paper, we apply an Environmental Quality Index for Argentina´s Pampas Region at the department scale ‑219 spatial units‑systematizing our field work and using the latest available information. The index consists of a combination of 23 indicators which include: a nature‑based recreational resources, b socially constructed resources, and c environmental problems. Its application shows a high degree of diversity in the study area thus emphasizing territorial contrasts present in a country locaated in Latin America. The proper sizing of the environmental inequity provides useful elements for policy intervention that can mitigate socio‑territorial asymmetries, which significantly affect the living conditions of the population.

  6. Frontiers, territoriality and tensions in bordering spaces

    Directory of Open Access Journals (Sweden)

    María Eugenia Comerci

    2012-01-01

    Full Text Available The expansión of the agricultural frontier in the Argentine pampas implied a re-valuation of "bordering" spaces, which were considered "marginal" by capital. This paper aims at interpreting the socio-territorial impact -from both a material and a symbolic level- being caused by the expansión of the productive, business-profile [agricultural and oil] frontier in the center-west of the province of La Pampa. With the interpretative approach provided by qualitative methodologies, we intend to analyze -in a case study- how these frontier expansión processes altered and re-defined the social arena between the years 2000 and 2010, the social construction of the space and the power relations in Chos Malal

  7. Manejo de recursos culturales y puesta en valor de historias regionales

    Directory of Open Access Journals (Sweden)

    Mónica Berón

    2015-06-01

    Full Text Available Desde el año 2002 se esta desarrollando un Plan de Manejo de Recursos Culturales (MCR en el marco de un convenio interinstitucional en el sur de la provincia de La Pampa (República Argentina. El mismo se lleva a cabo en la localidad de Puelches y tiene como objetivos principales el uso racional, rentable y sustentable de los recursos culturales (APN 2000. El patrimonio, conformado por estos recursos, es la base fundamental de la identidad de un pueblo. En este mismo sentido se orientan los resultados de la investigación básica del pasado prehispánico del área. Recientemente un proyecto turístico impulsado por el gobierno central de La Pampa ha dado un giro a distintos aspectos del proyecto, que proponemos discutir en este trabajo.

  8. La inimputabilidad y el tratamiento del disminuido psíquico en el proceso penal

    Directory of Open Access Journals (Sweden)

    José Manuel Rojas Salas

    2013-12-01

    Full Text Available La Constitución Política colombiana proscribe cualquier tipo de responsabilidad objetiva; en consecuencia, es necesario que la persona a la que se sancione con una pena haya actuado con culpabilidad, cosa que no sucede con los inimputables, personas que no pueden comprender la ilicitud de su conducta o determinarse de acuerdo con dicha comprensión, por lo que el Código Penal establece dos regímenes diferenciados de responsabilidad penal: uno para imputables y otro para inimputables, para quienes no se prevén penas sino medidas de seguridad. Por el contrario, la Ley 906 de 2004 no contempla un tratamiento jurídico diferenciado para quienes no tienen la capacidad de comprender o decidir voluntariamente sobre sus derechos en el proceso penal, por lo que se propone un nuevo enfoque al respecto.

  9. PESQUISA DE MERCADO PARA ABERTURA DE UMA LOJA DE BOLOS CASEIROS “DELICIAS DA DONA GÊ” NO MUNICÍPIO DE SÃO JOSÉ DOS CAMPOS (SP

    Directory of Open Access Journals (Sweden)

    Alberto Bruno Silva Lacerda

    2017-01-01

    Full Text Available O trabalho tem como objetivo realizar uma pesquisa de mercado para uma empresa atuante no comércio alimentício com fabricação e comercialização de bolos caseiros, visando ser reconhecida no segmento alimentício e atender as necessidades dos clientes. A empresa irá comercializar produtos de qualidade que seja acessível para todos os públicos. A partir dessa ideia, a empresa tem como diferencial um espaço Gourmet que proporcionará aos clientes um ambiente diferenciado onde poderão degustar a variedade de produtos. Com o método da pesquisa quantitativa e qualitativa, usada para mapear a região de estudo, percebeu-se que as pessoas se interessariam pelos produtos e pelo ambiente diferenciado apresentado.

  10. Groundwater flow in a closed basin with a saline shallow lake in a volcanic area: Laguna Tuyajto, northern Chilean Altiplano of the Andes.

    Science.gov (United States)

    Herrera, Christian; Custodio, Emilio; Chong, Guillermo; Lambán, Luis Javier; Riquelme, Rodrigo; Wilke, Hans; Jódar, Jorge; Urrutia, Javier; Urqueta, Harry; Sarmiento, Alvaro; Gamboa, Carolina; Lictevout, Elisabeth

    2016-01-15

    Laguna Tuyajto is a small, shallow saline water lake in the Andean Altiplano of northern Chile. In the eastern side it is fed by springs that discharge groundwater of the nearby volcanic aquifers. The area is arid: rainfall does not exceed 200mm/year in the rainiest parts. The stable isotopic content of spring water shows that the recharge is originated mainly from winter rain, snow melt, and to a lesser extent from some short and intense sporadic rainfall events. Most of the spring water outflowing in the northern side of Laguna Tuyajto is recharged in the Tuyajto volcano. Most of the spring water in the eastern side and groundwater are recharged at higher elevations, in the rims of the nearby endorheic basins of Pampa Colorada and Pampa Las Tecas to the East. The presence of tritium in some deep wells in Pampa Colorada and Pampa Las Tecas indicates recent recharge. Gas emission in recent volcanoes increase the sulfate content of atmospheric deposition and this is reflected in local groundwater. The chemical composition and concentration of spring waters are the result of meteoric water evapo-concentration, water-rock interaction, and mainly the dissolution of old and buried evaporitic deposits. Groundwater flow is mostly shallow due to a low permeability ignimbrite layer of regional extent, which also hinders brine spreading below and around the lake. High deep temperatures near the recent Tuyajto volcano explain the high dissolved silica contents and the δ(18)O shift to heavier values found in some of the spring waters. Laguna Tuyajto is a terminal lake where salts cumulate, mostly halite, but some brine transfer to the Salar de Aguas Calientes-3 cannot be excluded. The hydrogeological behavior of Laguna Tuyajto constitutes a model to understand the functioning of many other similar basins in other areas in the Andean Altiplano. Copyright © 2015 Elsevier B.V. All rights reserved.

  11. 47 CFR 73.202 - Table of Allotments.

    Science.gov (United States)

    2010-10-01

    ... Level 248A Rockford 286A Saint Florian 274A Waverly 262A ALASKA Palmer 238C1 ARIZONA Aguila 297C3 Ajo... *265A Terre Haute *298B Worthington 231A IOWA Asbury *238A Keosauqua *271C3 Moville *246A North English... Newcastle 263A O'Brien 261A Ozona 275C3, 289C1 Paducah 234C3 Paint Rock 296C3 Palacios 264A Pampa 277C2...

  12. Formosa: tierra prometida-tierra arrasada. La Argentina de los márgenes (1884-1955)

    OpenAIRE

    Girbal Blacha, Noemí

    2014-01-01

    In times of Modern Argentina (1880 -1930) marginality is part of the agro- export model; structured around Buenos Aires port and the Pampas livestock-cereal, the recipient of massive immigration, growing urbanization and foreign investment concentration. Marginality does not always mean isolation. This is the case of Argentinean Gran Chaco situated in northeastern Argentina, crossed by 3 railways and major waterways, which communicate with the powerful metropolitan littoral. Formosa, borderin...

  13. Tricholeiperia peruensis n. sp. (Nematoda, Molineidae) del quiróptero Lophostoma silvicolum occidentalis (Phyllostomidae) en Tumbes, Perú

    OpenAIRE

    Vargas, Marina; Martínez, Rosa; Tantaleán V, Manuel; Cadenillas, Richard; Pacheco, Víctor

    2008-01-01

    In the present work, Tricholeiperia peruensis. n sp. (Nematoda, Molineidae) is described on the basis of 25 collected specimens from 5 bat intestines of the Lophostoma silvicolum occidentalis species from Angostura, district of Pampas de Hospital, department of Tumbes, Peru. The new species is characterized by the morphology of the cephalic vesicle in the form of hood with recesses, for the size and form of spikes whose distal end of the external branch is divided in 2 from which the internal...

  14. Phylogenetic reconstruction of South American felids defined by protein electrophoresis

    OpenAIRE

    Pecon Slattery, J.; Johnson, W. E.; Goldman, D.; O'Brien, S. J.

    1994-01-01

    Phylogenetic associations among six closely related South American felid species were defined by changes in protein-encoding gene loci. We analyzed proteins isolated from skin fibroblasts using two-dimensional electrophoresis and allozymes extracted from blood cells. Genotypes were determined for multiple individuals of ocelot, margay, tigrina, Geoffroy's cat, kodkod, and pampas cat at 548 loci resolved by two-dimensional electrophoresis and 44 allozyme loci. Phenograms were constructed using...

  15. Hacia una Guía Digital Móvil para la identificación y manejo sustentable de los pastizales naturales

    OpenAIRE

    Frank, Federico; Bellini Saibene, Yanina; Pizarro, Rubén A.; Caldera, Juan; Testa, Oscar; Llorens, Enrique

    2017-01-01

    Los pastizales naturales son comunidades vegetales presentes en zonas no adecuadas para cultivos, y constituyen una fuente de forraje basada principalmente en plantas nativas. En La Pampa ocupan el 70% del territorio, coexistiendo varias fisonomías, con distinta productividad y respuesta al pastoreo. Las actividades de estas áreas giran en relación a la ganadería, siendo el pastizal natural su principal fuente forrajera. Por lo tanto, se hace imprescindible contar con herramientas para un ...

  16. Características reproductivas de la cabra Colorada Pampeana

    OpenAIRE

    Gómez-Castro, A.G.; Bedotti, D.; Martos Peinado, José; Sánchez Rodríguez, M.

    2003-01-01

    Information on seven different flocks of the Colorada goat breed in La Pampa (Argentina) was recorded during three consecutive years (1995-1997) to estimate reproductive performance. On the average, reproductive indexes were: fecundity: 87.85 percent, fertility: 92.12 percent, actual prolificity: 1.897 and commercial prolificity: 1.752. There were no signifficant differences among years for any index. On the contrary, flocks differed for fecundity and fertility percentage. Buck percentage was...

  17. Native species that can replace exotic species in landscaping

    Directory of Open Access Journals (Sweden)

    Elisabeth Regina Tempel Stumpf

    2015-08-01

    Full Text Available Beyond aesthetics, the contemporary landscaping intends to provide other benefits for humans and environment, especially related to the environmental quality of urban spaces and conservation of the species. A trend in this direction is the reduction in the use of exotic plants in their designs, since, over time, they can become agents of replacement of native flora, as it has occurred in Rio Grande do Sul with many species introduced by settlers. However, the use of exotic species is unjustifiable, because the flora diversity of the Bioma Pampa offers many native species with appropriate features to the ornamental use. The commercial cultivation and the implantation of native species in landscaped areas constitute innovations for plant nurseries and landscapers and can provide a positive reduction in extractivism, contributing to dissemination, exploitation and preservation of native flora, and also decrease the impact of chemical products on environment. So, this work intends to identify native species of Bioma Pampa with features and uses similar to the most used exotic species at Brazilian landscaping. The species were selected from consulting books about native plants of Bioma Pampa and plants used at Brazilian landscaping, considering the similarity on habit and architecture, as well as characteristics of leafs, flowers and/or fruits and environmental conditions of occurrence and cultivation. There were identified 34 native species able to properly replace exotic species commonly used. The results show that many native species of Bioma Pampa have interesting ornamental features to landscape gardening, allowing them to replace exotic species that are traditionally cultivated.

  18. NEGOCIACIONES COMERCIALES INTERNACIONALES DE PAISES DE PEQUEÑAS ECONOMIAS. ELEMENTOS PARA UNA ESTRATEGIA OPERATIVA DE NEGOCIACIÓN CON ILUSTRACIÓN DE PAISES CENTROAMERICANOS

    OpenAIRE

    Giovanni Reyes

    2003-01-01

    Esta propuesta tiene dos finalidades principales: (i) establecer elementos que ayuden a elaborar una estrategia operativa para las negociaciones que en la actualidad desarrolla Guatemala, conjuntamente con delegaciones de países centroamericanos, con Estados Unidos; y (ii) identificar mecanismos de trato preferencial y diferenciado que se inserten dentro las referidas negociaciones. Se requiere de una planificación práctica del proceso negociador que pueda ser ejecutada con agilidad, toda vez...

  19. La categoría gramatical de pronombre en inglés : criterios de definición y problemas de clasificación

    OpenAIRE

    Santana Lario, Juan

    2011-01-01

    estudio descriptivo de la categoría tradicional de los pronombres ingleses desde un punto de vista morfosintáctico, ofreciendo unos criterios (potencial funcional capacidad combinatoria, categorías gramaticales) para su caracterización como conjunto de palabras diferenciado, y discutiendo su posición en el sistema de las categorías gramaticales del inglés

  20. El sistema reticulo-endotelial

    Directory of Open Access Journals (Sweden)

    Carlos J. Cuartas L.

    1935-01-01

    multicelulares de organización bastante complicada, necesitan de mecanismos biológicos diferenciados para su defensa contra los agentes endógenos y exógenos, es asimismo razonable admitir en los grupos zoológicos inferiores, la existencia de constituyentes mesenquimáticos, que indican "una mayor amplitud para los límites que alcanza la representación del sistema dentro de la filogénesis".

  1. Participación de agentes en mercados financieros: aplicación de los modelos Chakraborty-Ray y Dornbusch

    OpenAIRE

    Giovanni Reyes

    2011-01-01

    La finalidad fundamental de este estudio es establecer modelos sobre el comportamiento, factores que influyen, y condicionantes generales macroeconómicas, que afectan la conducta de agentes financieros en dos ambientes diferenciados: (i) financiamiento directo; y (ii) financiamiento indirecto. Se considera el comportamiento de trabajadores con excedentes, inversionistas profesionales e intermediarios financieros, en particular instituciones bancarias. Se hace una aplicación de los modelos de ...

  2. Assessing the impacts of climate change on winter crop production in Uruguay and Argentina using crop simulation models

    Energy Technology Data Exchange (ETDEWEB)

    Baethgen, W.E. [International Fertilizer Development Center, Muscle Shoals, AL (United States); Magrin, G.O. [Inst. Nacional de Tecnologia Agropecuaria Castelar, Buenos Aires (Argentina). Inst. de Clima y Agua

    1995-12-31

    Enhanced greenhouse effect caused by the increase in atmospheric concentration of CO{sub 2} and other trace gases could lead to higher global surface temperature and altered hydrological cycles. Most possible climate change scenarios include higher atmospheric CO{sub 2} concentrations, higher temperatures, and changes in precipitation. Three global climate models (GCMs) were applied to generate climate change scenarios for the Pampas region in southern South America. The generated scenarios were then used with crop simulation models to study the possible impact of climate change on wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.) production in the Pampas. The authors evaluated the impact of possible climate change scenarios on wheat and barley production in Uruguay for a wide range of soil and crop management strategies including planting dates, cultivar types, fertilizer management, and tillage practices. They also studied the impact of climate change on wheat production across two transects of the Pampas: north to south transect with decreasing temperature, and east to west transect with decreasing precipitation. Finally, sensitivity analyses were conducted for both, the Uruguayan site and the transects, by increasing daily maximum and minimum temperature by 0, 2, and 4 C, and changing the precipitation by {minus}20, 0, and +20%.

  3. Weathering of ordinary chondrites from the Atacama Desert, Chile, by Mössbauer spectroscopy and synchrotron radiation X-ray diffraction

    Science.gov (United States)

    Munayco, Pablo; Munayco, Jimmy; Avillez, Roberto R.; Valenzuela, Millarca; Rochette, Pierre; Gattacceca, JéRôMe; Scorzelli, Rosa B.

    2013-03-01

    Some terrestrial areas have climatic and geomorphologic features that favor the preservation, and therefore, accumulation of meteorites. The Atacama Desert in Chile is among the most important of such areas, known as DCA. This desert is the driest on Earth, one of the most arid, uninhabitable localities with semiarid, arid, and hyper-arid conditions. The meteorites studied here were collected from within the DCA of San Juan and Pampa de Mejillones, located, respectively, in the Central Depression and the Coastal Range of the Atacama Desert. 57Fe Mössbauer spectroscopy was used for quantitative analysis of the degree of weathering of the meteorites, through the determination of the proportions of the various Fe-bearing phases and in particular the amount of oxidized iron in terrestrial alteration products. The abundance of ferric ions in weathered chondrites can be related to specific precursor compositions and to the level of terrestrial weathering. The aim of the study was the identification, quantification, and differentiation of the weathering products in the ordinary chondrites found in the San Juan and the Pampa de Mejillones areas of the Atacama Desert. The 57Fe Mössbauer spectroscopy study was complemented by synchrotron radiation X-ray diffraction and magnetic susceptibility measurements. The results allow a clear differentiation of the rate of weathering in meteorite samples collected from the San Juan versus the Pampa de Mejillones areas of the Atacama Desert.

  4. [Cross-sectional study of intestinal parasitosis in child populations in Argentina].

    Science.gov (United States)

    Navone, Graciela Teresa; Zonta, María Lorena; Cociancic, Paola; Garraza, Mariela; Gamboa, María Inés; Giambelluca, Luis Alberto; Dahinten, Silvia; Oyhenart, Evelia Edith

    2017-06-08

    Determine the distribution of intestinal parasitosis in children in nine provinces representative of Argentina's mosaic of contrasting environments. Descriptive, observational, cross-sectional study of preschool children (5 years old or under) and school-age children (6-14 years) in the provinces of Buenos Aires (sample taken between 2005 and 2013), Chubut (2010-2013), Corrientes (2012), Entre Ríos (2010-2012), Formosa (2014), La Pampa (2006), Mendoza (2008-2011), Misiones (2005-2008 and 2013), and Salta (2012-2013). Serial samples, fecal samples, and anal swabs were processed using concentration techniques. The results were analyzed by sex, age interval, and province. Frequency of parasitosis (monoparasitosis and multiple parasitoses), wealth of species, and Sørensen similarity coefficient were calculated. Misiones presented the highest frequency of parasitized children and Chubut the lowest (82.0% vs 38.4%; p parasitosis in Formosa (69.2%). The most frequent species in the majority of provinces were Blastocystis sp. and Enterobius vermicularis. Misiones presented the highest frequency of soil-transmitted helminthes (23.3%) and Mendoza the lowest (0.6%); none were found in Chubut, La Pampa, or Salta. Buenos Aires, Formosa, and Misiones presented a similar species composition, as did Chubut and La Pampa. The frequency of parasitosis in Argentina corresponds to the country's complex mosaic of climatic and socioeconomic variability and shows a declining trend from north to south and from east to west.

  5. Influencia de la temperatura y nivel de energía de compactación en las propiedades dinámicas de una mezcla asfáltica

    Directory of Open Access Journals (Sweden)

    Óscar Javier Reyes Ortiz

    2006-01-01

    Full Text Available La temperatura de las mezclas asfálticas varía significativamente desde su producción en la planta hasta la conformación de la estructura de pavimento, especialmente en el proceso de compactación. Estas diferencias de temperatura de la mezcla de un punto a otro, generan segregación, microfisuras, superficies onduladas, desgarramientos y especialmente cambios en las propiedades mecánicas y dinámicas de la mezcla.En este estudio de laboratorio se determinó el efecto en el módulo dinámico, densidad, estabilidad y flujo de una mezcla asfáltica con granulometría 0/10 y asfalto con penetración 60/70, al variar la temperatura de compactación. Se establece que al compactar muestras entre 100 y 150 ºC existe descenso del orden de 30% en el módulo dinámico, 5% en la densidad y 50% en la estabilidad.

  6. Centro Multiusos en Mannheim. Frei Otto. Doblando la malla hasta hacer una concha

    Directory of Open Access Journals (Sweden)

    Fernando G. Pino

    2016-04-01

    Full Text Available En 2015 Frei Otto recibió el Premio Pritzker. Como homenaje a este importante arquitecto del siglo XX este escrito busca profundizar en el Centro Polivalente de Mannheim como uno de los principales ejemplos de la arquitectura resuelta con la técnica Grid Shell, que consiste en una manera de doblar una superficie plana hecha con una malla de madera lo suficientemente flexible como para transformarse en una superficie ondulada que podría ofrecer un espacio complejo y rico, listo para ser usado. En clara oposición a los proyectos conocidos del estadio Olímpico de Munich o el Pabellón en la Exposición Universal de Montreal, con este edificio Frei Otto explora una estructura de compresión que sigue la geometría y la organización de las estructuras de la naturaleza. Este campo de experimentación e investigación acerca de las estructuras naturales es el centro en torno al que giró su trabajo durante toda su vida en el Instituto de Estructuras Ligeras en Stuttgart. La experimentación con maquetas y con técnicas de fotogrametría para extraer datos fidedignos relativos al estudio con las superficies de pompas de jabón, así como los estudios con pesos colgados de finas cadenas para obtener las formas finales de sus proyectos, caracterizan su trabajo.

  7. Occurrence and levels of glyphosate and AMPA in shallow lakes from the Pampean and Patagonian regions of Argentina.

    Science.gov (United States)

    Castro Berman, M; Marino, D J G; Quiroga, María Victoria; Zagarese, Horacio

    2018-06-01

    Glyphosate (N-(phosphonomethyl)glycine) is a broad-spectrum systemic herbicide used to kill weeds that compete with commercial crops. In Argentina, the use of glyphosate-based herbicides increased dramatically (up to ∼200,000 tons on 2012) since the introduction of glyphosate-resistant crops, such as transgenic soy and resistant corn, and the adoption of non-till practices in the 1990's. Sallow lakes within the Pampa region may be potentially impacted by continuous herbicide usage. We surveyed 52 shallow lakes from the Pampa region (Buenos Aires Province, Argentina) to assess the occurrence and concentrations of glyphosate and its main degradation product (AMPA). For comparison, we also sampled 24 shallow lakes from an area with no agricultural use of glyphosate (Northern Patagonia). Glyphosate and AMPA were analyzed by UPLC-MS/MS ESI (±) in lake water, suspended particulate matter (SPM), and sediment samples. Within the Pampa region, glyphosate residues were detected in >40% of samples. Glyphosate residues were detected more frequently in sediment and surface water than in SPM samples. The mean (maximum) concentrations of glyphosate were 2.11 (4.52) μg l -1 for surface water; 0.10 (0.13) μg l -1 for SPM and 10.47 (20.34) μg kg -1 for sediment samples, respectively. Whereas, mean (maximum) concentrations of AMPA were 0.84 and (0.90) μg l -1 for surface water; 0.07 (0.07) μg l -1 for SPM; and 22.53 (32.89) μg kg -1 for sediment samples. The herbicide was not detected in samples from the Patagonian region. To our knowledge, this is the first study reporting the occurrence and concentrations of the herbicide in freshwater lakes of Argentina. Copyright © 2018 Elsevier Ltd. All rights reserved.

  8. Dinâmica sedimentar e feições sedimentares identificadas na superfície de fundo do sistema Cananéia-Iguape, SP

    Directory of Open Access Journals (Sweden)

    Moysés Gonsalez Tessler

    1998-01-01

    Full Text Available O sistema Cananéia-Iguape é separado do oceano pela Ilha Comprida, com aproximadamente 70 km de extensão, tendo como limites ao sul e ao norte, respectivamente, as desembocaduras de Cananéia e Icapara. Estudos sobre as modificações na configuração das margens do sistema, no padrão de distribuição sedimentar, bem como sobre o conhecimento do padrão hidrodinâmico evidenciaram a interrelação existente entre os mecanismos de circulação geral, condicionados principalmente pelas correntes geradas pelas marés e a variação temporal de descarga de água doce, e a distribuição espacial dos sedimentos de superfície dos fundos dos canais. Dentre as feições sedimentares identificadas nas superfícies de fundo destacam-se as ocorrências de marcas onduladas de grande porte (1 a 2 metros de altura e comprimentos de onda de 20 a 30 metros concentradas no canal entre a Ponta do Frade (Mar de Cananéia e a foz do Rio Subaúma (Mar Pequeno. Estas feições de fundo resultam da dinâmica junto aos fundos dos canais, sob forte influência das correntes de maré, sobre sedimentos predominantemente arenosos, cujas fontes atuais são os depósitos quaternários de planície costeira depositados durante os eventos transgressivos/regressivos quaternários. A análise das orientações das correntes de maré, indicadas pelas marcas onduladas assimétricas, permite concluir que o local que representa, no processo hidrodinâmico da área, o ponto de inversão do sentido das marés vazantes, anteriormente atribuído à área da Pedra do "Tombo", apresenta-se, na verdade, deslocado cerca de 10 km no sentido SW.Cananéia-Iguape coastal system is located in the Southern part of São Paulo State. A 72 km long barrier beach named Ilha Comprida separates it from the Atlantic Oceano Based on studies of the evolution of channel margins, bottom sediment distribution and hydrodynamic pattern of the Cananéia-Iguape system, a relationship between the general

  9. Phosphorus availability in the central area of the Argentine Pampean region. 1: Relationship between soil parameters, adsorption processes and wheat, soybean and corn yields in different soil and management environments Disponibilidad de fósforo en el área central de la Región Pampeana Argentina. 1: Relación entre los parámetros edáficos, los procesos de adsorción y los rendimientos de trigo, soja y maíz en diferentes ambientes de suelo y de manejo del cultivo Disponibilidade de fósforo na área central da Pampa Argentina. 1: Relação entre parâmetros do solo, processos de adsorção e rendimentos de trigo, soja e milho em diferentes ambientes de solo e manejo da cultura

    Directory of Open Access Journals (Sweden)

    Martín M. Silva Rossi

    2013-03-01

    Full Text Available Retention of phosphorus in the soil solid phase is a complex process, caused by a combination of physical and chemical mechanisms that determine pools of compounds with different degrees of solubility. The amount of P available in a given pool can be associated with the adsorption maximum proposed by the Langmuir isotherm model, and with the energy with which it is retained. The aims of this work were: i to evaluate the impact of the fertilization history and soil type on phosphorus adsorption parameters, and ii to analyze the effect of soil properties, mainly the phosphorus adsorption parameters, on the yield of wheat, soybean and corn crops. In this study we established that the Bray & Kurtz 1 extractant is insufficiently sensitive for assessing changes in the nutrient availability when phosphorous concentrations are relatively low. The amount of phosphorus retained in the labile pool and its retention energy, however, are sensitive indicators of the availability of this nutrient. These indexes explain most of the variations in crop yields, and are determined more by P fertilization management than by soil type.La retención de fósforo en la fase sólida del suelo es un proceso complejo que es causada por una combinación de varios mecanismos físicos y químicos, que determinarán reservorios de compuestos con diferente grado de solubilidad. La cantidad de P disponible en un reservorio dado se puede asociar al máximo de adsorción propuesto por el modelo de isoterma de Langmuir y a la energía con la que está retenida en la fase sólida. Los objetivos de este trabajo fueron: i evaluar el impacto de la historia de fertilización y el tipo de suelo en los parámetros de adsorción de fósforo, y ii analizar el efecto de las propiedades del suelo, principalmente los parámetros de adsorción de fósforo, en el rendimiento de los cultivos de trigo, soja y maíz. En este estudio se estableció la baja sensibilidad del extractante Bray y Kurtz 1 para evaluar los cambios en la disponibilidad de fósforo cuando las concentraciones son relativamente bajas, mientras que la cantidad del nutriente retenido en el reservorio lábil y su energía de adsorción son indicadores sensibles de su disponibilidad. Estos índices explican la mayor parte de las variaciones en los rendimientos de los cultivos y están determinados más por las condiciones de manejo que por el tipo de suelo.A retenção de fósforo na fase sólida do solo é um processo complexo, que é causada por uma combinação de vários mecanismos físicos e químicos que determinam reservatórios de compostos com diferentes graus de solubilidade. A quantidade de P disponível em um determinado reservatório pode ser associada com a adsorção máxima proposta pelo modelo de isotérmica de Langmuir e pela energia que é retida na fase sólida. Os objetivos deste estudo foram: i avaliar o impacto do historial do tipo de fertilização e de solo sobre os parâmetros de sorção de fósforo, e ii analisar o efeito das propriedades dos solos, principalmente os parâmetros de adsorção de fósforo, nas produções de trigo, soja e milho. Este estudo permitiu verificar a baixa sensibilidade do extractante de Bray e Kurtz 1 para avaliar mudanças na disponibilidade de fósforo, quando as concentrações são relativamente baixas, enquanto a quantidade de nutrientes retida no reservatório lábil e na energia de adsorção são indicadores sensíveis à disponibilidade deste nutriente. Estes índices explicam a maior parte da variação que ocorre na produção das culturas, e são determinados essencialmente pela gestão da fertilização fosfatada mais do que pelo tipo de solo.

  10. Gestão agroecológica de microbacias hidrográficas através de técnicas de geoprocessamento e sensoriamento remoto: caso Fazenda Pantanoso

    Directory of Open Access Journals (Sweden)

    Santos Fioravante Jaekel dos

    2004-01-01

    Full Text Available O manejo sustentado de agroecossistemas passa pelo planejamento de uso dos mesmos, para o que necessita serem avaliados os recursos naturais e as condições sociais, culturais e econômicas dos habitantes. Técnicas de geoprocessamento e sensoriamento remoto, que permitem avaliar os recursos de grandes áreas e anexá-los a bancos de dados georreferenciados, foram utilizados para caracterizar o meio físico e planejar o uso da fazenda El Pantanoso, Departamento de Cerro Largo, Uruguai. Dados topográficos, planialtimétricos, de solo e uso atual, foram usados para gerar os planos de informação: mapa base, modelo numérico do terreno, declividade, solos, aptidão de uso agrícola dos solos, uso atual, zoneamento ambiental e conflitos de uso. A pesquisa mostra que a região apresenta Planossolos, Argissolos, Chernossolos, Vertissolos, Organossolos, Neossolos e Gleissolos e que os mesmos apresentam ampla faixa de aptidão de uso, o que facilita seu zoneamento ambiental. Considerando-se que a tradicional pecuária desenvolvida nas áreas de topografia ondulada e arroz nas várzeas, constitui o uso adequado dos solos, então lavouras de arroz encontradas ao longo dos sistemas de drenagem, onde deveria ser mantida a vegetação ciliar natural, constitui o principal conflito de uso relacionado ao zoneamento ambiental da região. O geoprocessamento e sensoriamento remoto mostraram-se eficientes no planejamento de uso da Fazenda Pantanoso.

  11. Una nueva ultraestructura de ópalo CT en silcretas. Posible indicador de influencia bacteriana

    Directory of Open Access Journals (Sweden)

    Bustillo, Mª A.

    1995-04-01

    Full Text Available Electron microscope observations of opaline silcretes found in the playa of a Miocene shallow lake reveal new opal CT microstructures. These microstructures are made up of fibres, filaments or rods, which are formed, in tum by coalesced microspheres or microhemispheres (0,1-0,2 µ diameter. They are up to 10 µ in length although larger ones could exist. They are straight, bent, wavy or even hairpin shaped. These microstructures comprise part of the opaline mass of the silcretes and are very similar to both neogenic opaline structures which are formed by bacterial intluence and to silicified biofilms. Therefore microbial mediation could exist in the genesis of this opal CT, although a possible inorganic origin by silicification of sepiolite is also considered.Un estudio mediante MEB de silcretas miocenas opalinas formadas por silicificación de playas en un ambiente de «playa-lake» pone de manifiesto la existencia de una nueva microestructura de ópalo CT. Esta microestructura denominada en general fibrosa, se manifiesta por la presencia de multitud de fibras, filamentos o varillas formadas por la alineación de microesferas o microhemisferas que presentan un diámetro entre 0,1 y 0,2 µ. Las fibras, filamentos o varillas tienen formas variables: rectas, curvadas, onduladas y «en horquilla», y presentan longitudes de hasta 10 µ, aunque podrían existir longitudes mayores. La disposición organizada de las microesferas en filamentos o fibras, constituyendo la masa general del ópalo, y su parecido con microestructuras opalinas que han sido formadas por influencia bacteriana, hacen considerar esta hipótesis, aunque no se puede descartar totalmente un origen inorgánico por silicificación de sepiolita.

  12. Groundwater flow in a closed basin with a saline shallow lake in a volcanic area: Laguna Tuyajto, northern Chilean Altiplano of the Andes

    International Nuclear Information System (INIS)

    Herrera, Christian; Custodio, Emilio; Chong, Guillermo; Lambán, Luis Javier; Riquelme, Rodrigo; Wilke, Hans; Jódar, Jorge; Urrutia, Javier; Urqueta, Harry; Sarmiento, Alvaro

    2016-01-01

    Laguna Tuyajto is a small, shallow saline water lake in the Andean Altiplano of northern Chile. In the eastern side it is fed by springs that discharge groundwater of the nearby volcanic aquifers. The area is arid: rainfall does not exceed 200 mm/year in the rainiest parts. The stable isotopic content of spring water shows that the recharge is originated mainly from winter rain, snow melt, and to a lesser extent from some short and intense sporadic rainfall events. Most of the spring water outflowing in the northern side of Laguna Tuyajto is recharged in the Tuyajto volcano. Most of the spring water in the eastern side and groundwater are recharged at higher elevations, in the rims of the nearby endorheic basins of Pampa Colorada and Pampa Las Tecas to the East. The presence of tritium in some deep wells in Pampa Colorada and Pampa Las Tecas indicates recent recharge. Gas emission in recent volcanoes increase the sulfate content of atmospheric deposition and this is reflected in local groundwater. The chemical composition and concentration of spring waters are the result of meteoric water evapo-concentration, water–rock interaction, and mainly the dissolution of old and buried evaporitic deposits. Groundwater flow is mostly shallow due to a low permeability ignimbrite layer of regional extent, which also hinders brine spreading below and around the lake. High deep temperatures near the recent Tuyajto volcano explain the high dissolved silica contents and the δ"1"8O shift to heavier values found in some of the spring waters. Laguna Tuyajto is a terminal lake where salts cumulate, mostly halite, but some brine transfer to the Salar de Aguas Calientes-3 cannot be excluded. The hydrogeological behavior of Laguna Tuyajto constitutes a model to understand the functioning of many other similar basins in other areas in the Andean Altiplano. - Highlights: • Recent volcanism formations play a key role in producing recharge. • Groundwater can flow across local

  13. Reviews of recent publications

    Directory of Open Access Journals (Sweden)

    2003-01-01

    Full Text Available Aizenberg, Edna. Parricide on the Pampa? A New Study and Translation of Alberto Gerchunoffs "Los gauchos judíos" by Jan Mennell Emerson, Caryl, ed. Critical Essays on Mikhail Bakhtin by Michael Barry Finney, Gail. Christa Wolf by Stephen Brockmann Hoeg, Jerry. Science, Technology, and Latin American Narrative in the Twentieth Century and Beyond by Paul Fallon Mendez-Ramirez, Hugo. Neruda's Ekphrastic Experience: Mural Art and Canto general by Agustin Boyer Perriam, Chris, Michael Thompson, Susan Frenk, and Vanessa Knights. A New History of Spanish Writing: 1939 to the 1990s by William Sherzer Soto, Francisco. Reinaldo Arenas by Marina Llorente

  14. Reconstruyendo el itinerario del camino Inca Cajatambo: Pumpu a través del registro arqueológico

    OpenAIRE

    Casaverde Ríos, Guido

    2013-01-01

    El camino Inca investigado pertenece al Sistema Vial Inca de la sierra central, el cual era parte del ramal que se desprendía muy cerca del sitio Inca de Huamachuco por el norte y recorría por todo el Callejón de Huaylas, se dirigía a las localidades de Mangas, Copa, Puquián, Cajatambo, Oyón hasta Pumpu por el sur. Aquel tramo iba de forma paralela al tramo de camino Inca que unía los asentamientos Inca de Huamachuco, Callejón de Conchucos, Huánuco Pampa y Pumpu.

  15. Minga en Xuxuy: La oportunidad de socializar el conocimiento a través del voluntariado universitario

    OpenAIRE

    Ocampo, Susana Blanca; Quintana, Sonia B.; Benavidez, Ariel C. R.

    2007-01-01

    Con el propósito de lograr que cada familia de niños y jóvenes se apropie responsablemente del conocimiento acerca de cómo crecen sus niños y adolescentes, se puso en marcha el proyecto de voluntariado universitario Minga en Xuxuy: trabajo conjunto por niños y adolescentes. Se implementaron talleres participativos destinados a madres, padres y tutores de tres grupos poblacionales seleccionados (dos de San Salvador de Jujuy y uno de Abra Pampa), tendientes a la apropiación de la técnica de med...

  16. Parametrización y optimización de modelos de inversión para la obtención de humedad del suelo a partir de datos satelitales de Radares de Apertura Sintética

    OpenAIRE

    Barber, Matías Ernesto

    2013-01-01

    Dentro del Plan Espacial Nacional (PEN), la Comisión Nacional de Actividades Espaciales (CONAE) tiene previsto el lanzamiento de la misión satelital SAOCOM, un radar de apertura sintética (SAR) que opera en microondas (λ = 23cm) y cuyo principal objetivo es la estimación de humedad del suelo sobre Pampa Húmeda. El problema de la estimación de variables biogeofísicas a partir de imágenes SAR es un problema mal condicionado, donde con frecuencia existen muchas combinaciones de parámetros de la ...

  17. Groundwater flow in a closed basin with a saline shallow lake in a volcanic area: Laguna Tuyajto, northern Chilean Altiplano of the Andes

    Energy Technology Data Exchange (ETDEWEB)

    Herrera, Christian, E-mail: cherrera@ucn.cl [Departamento de Ciencias Geológicas, Universidad Católica del Norte, Casilla 1280, Antofagasta (Chile); Centro de Investigación Tecnológica del Agua en el Desierto (CEITSAZA), Universidad Católica del Norte, Casilla 1280, Antofagasta (Chile); Custodio, Emilio [Department of Geo-Engineering, Technical University of Catalonia/Barcelona Tech (UPC), Barcelona (Spain); Chong, Guillermo [Departamento de Ciencias Geológicas, Universidad Católica del Norte, Casilla 1280, Antofagasta (Chile); Lambán, Luis Javier [Geological Institute of Spain (IGME), Zaragoza (Spain); Riquelme, Rodrigo; Wilke, Hans [Departamento de Ciencias Geológicas, Universidad Católica del Norte, Casilla 1280, Antofagasta (Chile); Jódar, Jorge [Department of Geo-Engineering, Technical University of Catalonia/Barcelona Tech (UPC), Barcelona (Spain); Urrutia, Javier; Urqueta, Harry [Departamento de Ciencias Geológicas, Universidad Católica del Norte, Casilla 1280, Antofagasta (Chile); Centro de Investigación Tecnológica del Agua en el Desierto (CEITSAZA), Universidad Católica del Norte, Casilla 1280, Antofagasta (Chile); Sarmiento, Alvaro [Departamento de Ciencias Geológicas, Universidad Católica del Norte, Casilla 1280, Antofagasta (Chile); and others

    2016-01-15

    Laguna Tuyajto is a small, shallow saline water lake in the Andean Altiplano of northern Chile. In the eastern side it is fed by springs that discharge groundwater of the nearby volcanic aquifers. The area is arid: rainfall does not exceed 200 mm/year in the rainiest parts. The stable isotopic content of spring water shows that the recharge is originated mainly from winter rain, snow melt, and to a lesser extent from some short and intense sporadic rainfall events. Most of the spring water outflowing in the northern side of Laguna Tuyajto is recharged in the Tuyajto volcano. Most of the spring water in the eastern side and groundwater are recharged at higher elevations, in the rims of the nearby endorheic basins of Pampa Colorada and Pampa Las Tecas to the East. The presence of tritium in some deep wells in Pampa Colorada and Pampa Las Tecas indicates recent recharge. Gas emission in recent volcanoes increase the sulfate content of atmospheric deposition and this is reflected in local groundwater. The chemical composition and concentration of spring waters are the result of meteoric water evapo-concentration, water–rock interaction, and mainly the dissolution of old and buried evaporitic deposits. Groundwater flow is mostly shallow due to a low permeability ignimbrite layer of regional extent, which also hinders brine spreading below and around the lake. High deep temperatures near the recent Tuyajto volcano explain the high dissolved silica contents and the δ{sup 18}O shift to heavier values found in some of the spring waters. Laguna Tuyajto is a terminal lake where salts cumulate, mostly halite, but some brine transfer to the Salar de Aguas Calientes-3 cannot be excluded. The hydrogeological behavior of Laguna Tuyajto constitutes a model to understand the functioning of many other similar basins in other areas in the Andean Altiplano. - Highlights: • Recent volcanism formations play a key role in producing recharge. • Groundwater can flow across local

  18. Altas concentraciones de flúor y oligoelementos asociados en aguas del sur de la llanura Pampeana

    OpenAIRE

    Espósito, Martín Eduardo; Sequeira, Mario Eduardo; Paoloni, Juan Dario; Blanco, M. C.; Amiotti, N.

    2017-01-01

    We investigated the levels of F and its relationship with As, B and V in ground and surface waters of the southern Pampas, where cases of dental and skeletal fluorosis, and arsenic in hair and urine samples have been detected in the rural population. Eating vegetables and cereals grown in irrigated areas with excessive fluoride may increase the risk of fluorosis due to the addition of the extra F contributed from other sources such as drinking water. Moreover, if these elements exceed the tol...

  19. Los insectos galícolas en Schinus fasciculata (Anacardiaceae) en el Espinal del centro de Argentina

    OpenAIRE

    Melisa Malcolm; Antonia J. Oggero; Marcelo D. Arana; María del Carmen Tordable; Graciela T. Boito

    2015-01-01

    La más compleja de las interacciones que plantas e insectos han desarrollado durante el transcurso de su evolución, son las agallas. Las especies de insectos galícolas se encuentran en la mayoría de las regiones biogeográficas, principalmente en ambientes xéricos, de los cuales un ejemplo lo constituye la ecorregión del Espinal, ubicada en la Provincia Biogeográfica de la Pampa, Subregión Chaqueña. Schinus fasciculata (Griseb.) I.M. Johnst. (Anacardiaceae) es una especie arbórea o arbustiva r...

  20. Los insectos galícolas en Schinus fasciculata (Anacardiaceae) en el Espinal del centro de Argentina

    OpenAIRE

    Malcolm,Melisa; Oggero,Antonia J.; Arana,Marcelo D.; Tordable,María del Carmen; Boito,Graciela T.

    2015-01-01

    La más compleja de las interacciones que plantas e insectos han desarrollado durante el transcurso de su evolución, son las agallas. Las especies de insectos galícolas se encuentran en la mayoría de las regiones biogeográficas, principalmente en ambientes xéricos, de los cuales un ejemplo lo constituye la ecorregión del Espinal, ubicada en la Provincia Biogeográfica de la Pampa, Subregión Chaqueña. Schinus fasciculata (Griseb.) I.M. Johnst. (A...

  1. Estudio transversal de las parasitosis intestinales en poblaciones infantiles de Argentina

    Directory of Open Access Journals (Sweden)

    Graciela Teresa Navone

    2017-06-01

    Full Text Available RESUMEN Objetivo Determinar la distribución de las enteroparasitosis en niños de nueve provincias representativas del mosaico de ambientes contrastantes de Argentina. Métodos Estudio descriptivo, observacional y transversal en niños preescolares (de 5 años o menos y escolares (de 6 a 14 años de las provincias de Buenos Aires (muestra tomada entre 2005 y 2013, Chubut (2010-2013, Corrientes (2012, Entre Ríos (2010-2012, Formosa (2014, La Pampa (2006, Mendoza (2008-2011, Misiones (2005-2008 y 2013 y Salta (2012-2013. Se procesaron muestras seriadas, fecales y de escobillado anal, mediante técnicas de concentración. Los resultados se analizaron por sexo, intervalo de edad y provincia. Se calcularon la frecuencia de parasitosis (monoparasitosis y parasitosis múltiple, la riqueza de especies y el coeficiente de similitud de Sørensen. Resultados Misiones presentó la mayor frecuencia de niños parasitados y Chubut la menor (82,0% vs. 38,4%; p ˂ 0,01. El número de especies fue mayor en Misiones y Buenos Aires y menor en Chubut y La Pampa. Los varones estuvieron más parasitados que las mujeres solo en Buenos Aires. Las mayores frecuencias se encontraron en los preescolares de Buenos Aires y los escolares de Mendoza y Misiones (p < 0,05. La monoparasitosis fue más frecuente en Chubut (67,9% y las parasitosis múltiples en Formosa (69,2%. Las especies más frecuentes en la mayoría de las provincias fueron Blastocystis sp. y Enterobius vermicularis. De los geohelmintos, Misiones presentó la mayor frecuencia (23,3% y Mendoza la menor (0,6%; no se hallaron en Chubut, La Pampa y Salta. Buenos Aires, Formosa y Misiones presentaron una composición de especies similar, al igual que Chubut y La Pampa. Conclusiones Las frecuencias de parasitosis en Argentina responden al complejo mosaico de variabilidad climática y socioeconómica del país y revelan una tendencia descendente de norte a sur y de este a oeste.

  2. Tricholeiperia peruensis n. sp. (Nematoda, Molineidae) del quiróptero Lophostoma silvicolum occidentalis (Phyllostomidae) en Tumbes, Perú

    OpenAIRE

    Vargas, Marina; Martínez, Rosa; Tantaleán, Manuel; Cadenillas, Richard; Pacheco, Víctor

    2008-01-01

    En el presente trabajo, se describe a Tricholeiperia peruensis n. sp. (Nematoda, Molineidae) en base a 25 especímenes colectados del intestino de 5 murciélagos de la especie Lophostoma silvicolum occidentalis de la localidad de Angostura, distrito Pampas de Hospital, departamento de Tumbes, Perú. La nueva especie se caracteriza por la morfología de la vesícula cefálica en forma de capuchón con escotaduras, por el tamaño y forma de las espículas cuyo extremo distal de la rama externa se divide...

  3. Novel Small Molecule Antagonists of the Interaction of the Androgen Receptor and Transcriptional Co-regulators

    Science.gov (United States)

    2009-01-01

    of each synthesized compound and their retention in the lipid layer using a parallel artificial membrane permeation assay (PAMPA)30 (Figure 2A). The...779 Ci/mmol) (PerkinElmer, Boston, MA); [3H]-Rosiglitazone (ARC, St. Louis, MO) (50 Ci/mmol); Uncoated 96-well polypropylene (3359) and 384-well... liquid N2), and stored at - 80°C. To purify AR, cells were thawed at 4°C and resuspended in 30 mL of freshly prepared buffer 1 (50 mM Tris pH 7.5, 150

  4. Crop rotation and seasonal effects on fatty acid profiles of neutral and phospholipids extracted from no-till agricultural soils

    DEFF Research Database (Denmark)

    Ferrari, Alejandro E.; Ravnskov, Sabine; Larsen, John

    2015-01-01

    practices while NLFA 20:0 appears to be a good marker of HRsoils despite season or location. The PLFA-based taxonomic biomarkers for total bacteria, Gramnegativebacteria and arbuscular mycorrhiza showed a significant trend NE>HR>LR in the wintersampling. HR management was also characterized by high levels......Analysis of phospholipids (PLFA) and neutral lipids fatty acids (NLFA) was used to characterizeno-till productive agricultural soils associated with different crop rotation levels, replicated across a400 km transect in the Argentinean pampas, during two sampling seasons, summer and winter...

  5. Niveles de arsénico y vanadio en aguas naturales en el Departamento de Unión, sudeste de la provincia de Córdoba, Argentina.

    OpenAIRE

    Pérez Carrera, Alejo; Fernández Cirelli, Alicia

    2013-01-01

    En Argentina, existen grandes regiones que por sus características edafoclimáticas, poseen excelentes aptitudes agropecuarias, sin embargo, sufren limitaciones de desarrollo debido a la disponibilidad de agua y la calidad del recurso hídrico disponible. Uno de los elementos químicos presentes en el agua, con mayor impacto sobre la salud humana y animal, es el arsénico. La región afectada, abarca las provincias de Córdoba, La Pampa, Santiago del Estero, San Luis, Santa Fe, Buenos Aires, Chaco,...

  6. Red worm behavior (Eisenia spp.) in vermicomposting systems of organic residues

    OpenAIRE

    Mamani-Mamani Gladys; Mamani-Pati Francisco; Sainz-Mendoza Humberto; Villca-Huanaco René

    2012-01-01

    This work evaluates the behavior of the vermicomposting red worm (Eisenia spp.) in two environments (greenhouse and unsheltered) and with two solid organic substrates (cow manure=CM and kitchen waste=KW) in the zone of Carmen Pampa, Nor Yungas Province, Department of La Paz – Bolivia, using a factorial design with two factors and three repetitions (ANOVA analysis). The largest number of cocoons was found in the greenhouse treatment, with 64 in CM and 41 in KW. Cocoon viability was also greate...

  7. Engorde intensivo a corral (feedlot): una actividad agraria apenas legislada

    OpenAIRE

    Pilatti, Héctor Hugo

    2017-01-01

    En la zona de la pampa húmeda la actividad ganadera se ha desarrollado por años aprovechado los pastizales naturales y mediante esos mismos pastos mejorados, o praderas implantadas en los últimos tiempos, a veces proporcionando alimentos procesados o concentrados solo por breves períodos de tiempo, cuando los nutrimentos aportados por esas pasturas resultan escasos para compensar las necesidades de los animales. El sistema pastoril ha ubicado a nuestro país como uno de los productores de carn...

  8. Labradores y vecinos en la campaña bonaerense a mediados del siglo XIX

    OpenAIRE

    Andreucci, Bibiana

    2013-01-01

    Avanzado el siglo XIX y consolidado el modelo agroexportador en la Pampa argentina, la gran estancia, la ganadería extensiva y una distribución inequitativa de la tierra opacaron otras alternativas de desarrollo que se tuvieron en cuenta en los momentos de génesis de la modernización. Este artículo trata de recuperar el rol protagónico que los vecinos tuvieron en los pueblos bonaerenses a mediados del siglo xix, mostrando cómo los gobiernos de la época necesitaron de las redes existentes en l...

  9. Gravimetric study on the western edge of the Rio de La Plata craton

    International Nuclear Information System (INIS)

    Rame, G; Miro, R

    2010-01-01

    This work is about the gravimetric study on the western edge of the Rio de la Plata craton which belongs to the Gondwana fragment in the south of Brazil, Uruguay and central eastern of Argentina. The work consisted of a survey of 332 gravimetric and topographic stations extended from the western edge of the Sierra Chica de Cordoba up to 200 km east on the pampas. The gravity values observed (gobs) were obtained using a LaCoste §Rom berg gravimeter G-961 and 200T Sodin both with 0.01 mGal, referred to IGSN71 (International Gravity Standardization Net 1971) network

  10. “Pues para ello les quedaba livertad”. Comercio e interdependencia en las fronteras meridionales del imperio español (segunda mitad del siglo XVIII)

    OpenAIRE

    Alioto, Sebastián Leandro; Jiménez, Juan Francisco

    2010-01-01

    En la historiografía argentina acerca de las relaciones fronterizas en Pampa, Nordpatagonia y Araucanía se ha repetido, abierta o implícitamente, la idea de que los grupos nativos mantuvieron una relación de dependencia económica respecto de los hispano-criollos, de modo que la adquisición de ciertos productos de manos de los españoles se habría tornado imprescindible para su supervivencia. En este trabajo y concentrándonos en la segunda mitad del siglo XVIII, nos proponemos mostrar que ese n...

  11. Obstáculos epistemológicos en la enseñanza de estructura de datos y algoritmos

    OpenAIRE

    Pérez, Daniel; Aguirre, Sofía; Filippi, José Luis

    2016-01-01

    [4 p.] il. Los obstáculos epistemológicos bajo la forma de saber-cristalizado generan una suerte de inercia que dificulta el proceso de construcción de un nuevo saber. Su abordaje es necesario para minimizar su impacto negativo y lograr mejoras en los procesos de enseñanza y aprendizaje. El objetivo de este trabajo es identificar los obstáculos que impiden a los alumnos de Estructura de datos y algoritmos de la Facultad de Ingeniería de la Universidad Nacional de La Pampa resolver satis...

  12. Réquiem para María Elena: Notas sobre el imaginario de los últimos pampinos

    OpenAIRE

    Rodríguez T.,Juan Carlos; Miranda B.,Pablo; Mege R.,Pedro

    2005-01-01

    Este artículo refiere a la fuerza y la pervivencia de un imaginario de la pampa y de la cultura del salitre que se resiste a morir, pero que no encuentra referente en María Elena, el último pueblo salitrero. Tal imaginario, como acto compensatorio frente a la desestructuración de la comunidad y su identidad y que se refugia en elementos que no son sincrónicos en el actual espacio físico, laboral, psicológico, social, cultural y político del pueblo y sus habitantes, puede atrapar a antropólogo...

  13. A new species of Ituglanis (Siluriformes: Trichomycteridae from the rio Uruguai basin, southern Brazil

    Directory of Open Access Journals (Sweden)

    Juliano Ferrer

    2017-10-01

    Full Text Available ABSTRACT A new species of Ituglanis associated to the grasslands of the Pampa biome is described from the rio Uruguai basin, southern Brazil. The new species is distinguished from its congeners by the low number of ribs and by a unique color pattern composed of an outer layer with scattered round black blotches equivalent in size to the eye circumference over a reddish brown background on the lateral surface of the body. We provide the genetic sequences of the mitochondrial gene Cytochrome c Oxydase subunit I (COI for three of the paratypes and discuss aspects about the recent discovery of the new species.

  14. Studies on diversity and evolution of Iridaceae species in southern Brazil

    Directory of Open Access Journals (Sweden)

    Tatiana T. Souza-Chies

    2012-01-01

    Full Text Available Plants of the family Iridaceae are well represented in the grassland vegetation of southern Brazil, occurring in the Pampa and Atlantic Forest biomes. Nevertheless, little is known about the taxonomy and evolution of Iridaceae species in southern Brazil. The main goal of this review is to compile published information about South American Iridaceae, and to discuss the evolution and genetic diversity of the family presenting our own research data in the light of the published literature. The main focus is on the genera Calydorea, Cypella, Herbertia, and Sisyrinchium. Aspects of reproductive system and of pollinator attraction are also discussed.

  15. Economic selection indexes for Hereford and Braford cattle raised in southern Brazil.

    Science.gov (United States)

    Costa, R F; Teixeira, B B M; Yokoo, M J; Cardoso, F F

    2017-07-01

    Economic selection indexes (EI) are considered the best way to select the most profitable animals for specific production systems. Nevertheless, in Brazil, few genetic evaluation programs deliver such indexes to their breeders. The aims of this study were to determine the breeding goals (BG) and economic values (EV, in US$) for typical beef cattle production systems in southern Brazil, to propose EI aimed to maximize profitability, and to compare the proposed EI with the currently used empirical index. Bioeconomic models were developed to characterize 3 typical production systems, identifying traits of economic impact and their respective EV. The first was called the calf-crop system and included the birth rate (BR), direct weaning weight (WWd), and mature cow weight (MCW) as selection goals. The second system was called the full-cycle system, and its breeding goals were BR, WWd, MCW, and carcass weight (CW). Finally, the third was called the stocking and finishing system, which had WWd and CW as breeding goals. To generate the EI, we adopted the selection criteria currently measured and used in the empirical index of PampaPlus, which is the genetic evaluation program of the Brazilian Hereford and Braford Association. The comparison between the EI and the current PampaPlus index was made by the aggregated genetic-economic gain per generation (Δ). Therefore, for each production system an index was developed using the derived economic weights, and it was compared with the current empirical index. The relative importance (RI) for BR, WWd, and MCW for the calf-crop system was 68.03%, 19.35%, and 12.62%, respectively. For the full-cycle system, the RI for BR, WWd, MCW, and CW were 69.63%, 7.31%, 5.01%, and 18.06%, respectively. For the stocking and finishing production system, the RI for WWd and CW was 34.20% and 65.80%, respectively. The Δ for the calf-crop system were US$6.12 and US$4.36, using the proposed economic and empirical indexes, respectively. Respective

  16. Diseño de un sistema de cadena de suministros aplicable a una empresa de transporte de carga pesada. Caso Litena CIA. LTDA.

    OpenAIRE

    Cruz Huilcamaigua, César Augusto

    2015-01-01

    En el Ecuador el crecimiento del PIB que fue del 4,9% en el 2013, el quinto sector que más contribuyó fue el de transporte con el 0,39%. Litena Cia. Ltda. es una empresa Pyme familiar, tiene 5 años ofertando servicio de transporte pesado diversificado y diferenciado, se enfoca principalmente en el transporte de asfalto. La empresa ha logrado tener un crecimiento sostenible en los últimos años, pero en la actualidad, la empresa se está amenazada por el incremento de competencia ...

  17. Caracterización y optimización de las operaciones de procesado y conservación de la berza gallega ("Brassica oleracea" L. var. "acephala" cv. Galega)

    OpenAIRE

    Armesto Barge, Jorge

    2017-01-01

    El cultivo de la berza gallega (Brassica oleracea var. acephala cv. Galega) está ampliamente distribuido por todo el noroeste de España, formando esta hortaliza parte importante de la dieta tradicional de la población. Se cultivan y comercializan dos fenotipos diferenciados, uno de hoja rizada y otro de hoja lisa, cuyas características y diferencias composicionales se encuentran todavía por estudiar. Este vegetal se consume siempre tras un proceso de cocción que repercute de forma directa o i...

  18. Efetividade da "multimistura" como suplemento de dietas deficientes em vitaminas e/ou minerais na recuperação ponderal de ratos submetidos à desnutrição pós-natal

    OpenAIRE

    Ferreira,Haroldo da Silva; Assunção,Monica Lopes de; França,Adijane Oliveira Santos de; Cardoso,Eliana Paiva Cunha; Moura,Fabiana Andréa

    2005-01-01

    OBJETIVO: Avaliar a efetividade da "multimistura", usada como suplemento de dietas deficientes em vitaminas, deficientes em minerais, ou deficientes em vitaminas e minerais, na recuperação ponderal de ratos desnutridos. MÉTODOS: Após o desmame, 56 ratos Wistar, submetidos à desnutrição pós-natal, foram aleatoriamente distribuídos em 7 grupos diferenciados segundo o tipo de dieta oferecida: controle, dietas deficientes em vitaminas, deficientes em minerais, deficientes em vitaminas e minerais ...

  19. Amplitude e velocidade dos movimentos mastigatórios em pacientes com doença de Parkinson

    OpenAIRE

    Albuquerque,Lucas Carvalho Aragão; Silva,Hilton Justino da; Pernambuco,Leandro Araújo; Lima,Sandro Junior Henrique de; Cunha,Daniele Andrade da

    2017-01-01

    RESUMO Objetivo: caracterizar a amplitude e a velocidade dos ciclos mastigatórios avaliados por eletrognatografia em um grupo de indivíduos idosos e confrontar esses dados com outros dois grupos de sujeitos com doença de Parkinson (DP) diferenciados pela característica motora predominante. Métodos: os 42 participantes foram divididos em três grupos: A com 15 voluntários e média de idade de 62 anos, sendo 8 do sexo feminino; B com 14 voluntários Parkinsonianos com rigidez predominante e mé...

  20. A atividade musical e a consciência da particularidade

    OpenAIRE

    Pederiva, Patrícia Lima Martins

    2009-01-01

    Esta pesquisa buscou analisar a musicalidade em perspectiva histórico-cultural, o que significou compreender sua gênese, estrutura e função em momentos históricos diferenciados, a saber, na história natural, na história cultural, bem como em momentos de ruptura que implicam transformações nos modos de experienciar e vivenciar a musicalidade, seja em sua forma natural de expressão, seja na atividade musical propiciada pela música. O instrumento metodológico utilizado foi a análise genético-psi...

  1. Desenvolvimento de ingrediente simbiótico por fermentação de soro de leite e do subproduto da agroindústria de suco de laranja por grãos de Kefir e cultura probiótica

    OpenAIRE

    Eduardo Vinicius Baptista

    2010-01-01

    O mercado para produtos com diferenciado conteúdo de nutrientes continua a crescer. Neste contexto, este trabalho objetivou desenvolver um ingrediente simbiótico a base de subprodutos de agroindústrias. Para isto, foi utilizado soro de leite reconstituído em 7% (p/v), o qual foi fermentado com 10 e 1% (p/v) das culturas de grãos de Kefir e cultura Lyofast MT 036 LV, respectivamente, sob temperatura de 25°C por 24 horas. Após o processo fermentativo, o bagaço de laranja, previamente esteriliza...

  2. Relatório de Estágio Curricular – Centro Hospitalar de Trás-os-Montes e Alto Douro (Vila Real)

    OpenAIRE

    Borges, Vanessa

    2012-01-01

    Durante o período de estágio pude colocar em prática os conhecimentos teóricos que foram adquiridos ao longo do percurso académico. Sem dúvida que é muito importante colocar em prática o conhecimento adquirido e, ao mesmo tempo, trabalhase com um público-alvo, bastante diferenciado, (crianças, jovens, adultos e idosos), e põe-se em prática, acima de tudo, a missão do Animador Sociocultural. Este profissional tem como objetivo promover o desenvolvimento sociocultural de grupos e comunidades, c...

  3. Conjunto de ejercicios que contribuyan a la rehabilitación de pacientes con la enfermedad de Parkinson que asisten a los círculos de abuelos. (Estadio inicial

    Directory of Open Access Journals (Sweden)

    Carlos A. Morales Romero

    2011-06-01

    Full Text Available El presente trabajo propone a los profesores de Cultura Física en sus clases de ejercicios para abuelos, una opción de trabajo que garantice la incorporación, más rápida y eficiente, de estos pacientes a la sociedad, teniendo en cuenta las habilidades que han ido perdiendo progresivamente producto de la degeneración del sistema nervioso central.La propuesta contiene ejercicios diferenciados, teniendo en cuenta las limitaciones, el logro eficiente de las habilidades perdidas, describe cada ejercicio, las repeticiones, las orientaciones metodológicas para su realización y los medios a utilizar.

  4. Estudio nutricional de un equipo de fútbol de tercera división

    OpenAIRE

    Cristian Martínez Reñón; Pilar Sánchez Collado

    2013-01-01

    Objetivo: Analizar los hábitos y actitudes nutricionales de un equipo de fútbol semiprofesional. Método: Se realizó el estudio nutricional de 21 jugadores semiprofesionales de fútbol (18-35 años) analizando la ingesta y gasto energético diario así como la distribución de los macro- y micronutrientes diferenciado el tipo de día (normal, entrenamiento y competición). Resultados: El balance energético es negativo en los tres días estudiados (-31%; -38 % y 31-% respectivamente). Se observan difer...

  5. NEGOCIACIONES COMERCIALES INTERNACIONALES DE PAISES DE PEQUEÑAS ECONOMIAS. ELEMENTOS PARA UNA ESTRATEGIA OPERATIVA DE NEGOCIACIÓN CON ILUSTRACIÓN DE PAISES CENTROAMERICANOS

    Directory of Open Access Journals (Sweden)

    Giovanni Reyes

    2003-01-01

    Full Text Available Esta propuesta tiene dos finalidades principales: (i establecer elementos que ayuden a elaborar una estrategia operativa para las negociaciones que en la actualidad desarrolla Guatemala, conjuntamente con delegaciones de países centroamericanos, con Estados Unidos; y (ii identificar mecanismos de trato preferencial y diferenciado que se inserten dentro las referidas negociaciones. Se requiere de una planificación práctica del proceso negociador que pueda ser ejecutada con agilidad, toda vez que Washington evidencia tener interés en concluir un acuerdo comercial con Centroamérica para noviembre de este año.

  6. Turismo médico comparado en Colombia y Singapur: Estudio sectorial y perspectivas de desarrollo

    OpenAIRE

    Mario Alberto de la Puente Pacheco

    2017-01-01

    Se analiza el sector del turismo médico comparado para las localidades de Colombia y Singapur con el fin de identificar la estructura general sectorial de ambas para efectos de desarrollo integral diferenciado a partir de coyunturas particulares y políticas públicas. La metodología de investigación se basó en la recolección de datos oficiales y entrevistas a representantes gremiales e intermediarios de servicios médico-turísticos, que permite la agrupación de informació...

  7. Análise do nível de adesão ao disclosure do risco de mercado pelos bancos com ações negociadas na BM&FBOVESPA

    OpenAIRE

    Vinícius Costa da Silva Zonatto; Tarcita Cabral Ghizoni de Sousa; Francisco Carlos Fernandes

    2015-01-01

    O objetivo deste estudo é analisar o nível de adesão ao disclosure do risco de mercado pelas instituições financeiras com ações negociadas na Bolsa de Valores, Mercadorias e Futuros (BM&F Bovespa), no tocante às recomendações do Acordo de Basileia II, em especial pelos bancos listados nos Níveis Diferenciados de Governança Corporativa da BM&F Bovespa. A metodologia utilizada na pesquisa consistiu num estudo descritivo, realizado por meio de uma pesquisa documental, com abordagem q...

  8. La calidad en las agencias de viajes ante el reto de la Innovación Tecnológica

    OpenAIRE

    Esteban Alberdi, Cristina; Rubio Andrada, Luis

    2002-01-01

    Las Agencias de Viajes en España están asistiendo a una reestructuración del sector y a un cambio en sus actividades tradicionales. Para afrontar estos cambios deben desarrollar e implantar nuevas estrategias basadas en la calidad del servicio prestado. Para lograrlo, se propone un modelo basado en cuatro líneas de actuación que son la mejora de la formación de los agentes, el conocimiento de las características de su demanda, la adecuación a dicha demanda a través de productos diferenciados ...

  9. A SEPARAÇÃO ENTRE ESFERA PÚBLICA E PRIVADA: UM CONFRONTO ENTRE JOHN LOCKE, JEAN-JACQUES ROUSSEAU E CAROLE PATEMAN

    OpenAIRE

    Cunha de Moura, Samantha Nagle

    2014-01-01

    RESUMO: O presente artigo busca problematizar a separação entre esfera pública e esfera privada, existente no modelo liberal burguês, como um substrato legitimador da imposição de papeis sociais e sexuais diferenciados para homens e mulheres. Para tanto, o trabalho confronta as ideias fundamentais do pensamento de John Locke e de Jean-Jacques Rousseau, teóricos liberais contratualistas do séc. XVII-XVIII, diante da teoria do contrato sexual da teórica feminista Carole Pateman. Palavras-cha...

  10. Distribuição de Aglomerados Subnormais na Rede Urbana e nas Grandes Regiões Brasileiras

    OpenAIRE

    Vanessa Gapriotti Nadalin; Cleandro Krause; Vicente Correia Lima Neto

    2014-01-01

    A precariedade urbana e habitacional é heterogênea no Brasil, o que torna necessário fazer análises territoriais. Este trabalho analisa dados do Censo Demográfico 2010 relativos aos aglomerados subnormais (AS), buscando identificar comportamentos diferenciados nos municípios segundo uma rede urbana e sua inserção regional. Escolheu-se como classificação dos municípios brasileiros em rede urbana o estudo Regiões de Influência das Cidades 2007 (IBGE, 2008), ou REGIC, tendo sido encontradas quat...

  11. Sensado de variables mediante terminal Android

    OpenAIRE

    Altaba Rosas, Mar

    2017-01-01

    El presente documento describe los procesos de diseño y desarrollo de un sistema que, a través de una aplicación móvil, sirve como dispositivo para el registro de la actividad cardíaca del paciente, mediante la obtención del electrocardiograma (ECG), y que permite detectar irregularidades para posteriormente, en caso que fuera necesario, poder enviar los datos adquiridos al profesional sanitario pertinente para que éste los analice. El sistema tiene dos componentes diferenciados, por un lado,...

  12. Nuevas aportaciones al conocimiento epidemiológico de la theileriosis (Theileria annulata) en Extremadura

    OpenAIRE

    Rol Díaz, Juan Antonio

    2013-01-01

    En la memoria presentada se pueden encontrar tres apartados bien diferenciados. En el primero de ellos, se establece la cronobiología y distribución de los ixodidos que parasitan en los bovinos de la comarca de Cáceres. Se establecen los datos relativos a la incidencia y prevalencia de los ixodidos parásitos. En el segundo apartado, se establecen los ixodidos vectores de este protozoo llegando a determinar qué especies y cuáles no son capaces de albergar y transmitir a theileria annulata...

  13. Análisis de la percepción del uso de tecnología de productores pecuarios en Sinaloa, México.

    OpenAIRE

    Cuevas Reyes, Venancio; Astengo López, Enrique; Loaiza Meza, Alfredo; Antengo Cazares, Herlyn; Reyes Jimenez, Juan Esteban; González Gonzáles, Daniel; Moreno Gallegos, Tomas

    2016-01-01

    Resumen El objetivo de esta investigación fue identificar a través de la capacitación en campo, la percepción y conocimiento sobre componentes tecnológicos relacionados con la alimentación pecuaria que tienen diferentes tipos de productores en el norte de Sinaloa. Tres grupos de productores de Ahome, El Fuerte y Guasave fueron seleccionados por muestreo no probabilístico. Los productores entrevistados cuentan con conocimiento diferenciado respecto a la utilización de componentes relacionados ...

  14. Análisis de la percepción del uso de tecnología de productores pecuarios en Sinaloa, México.

    OpenAIRE

    Venancio Cuevas Reyes; Enrique Astengo López; Alfredo Loaiza Meza; Herlyn Antengo Cazares; Juan Esteban Reyes Jimenez; Daniel González Gonzáles; Tomas Moreno Gallegos

    2016-01-01

    El objetivo de esta investigación fue identificar a través de la capacitación en campo, la percepción y conocimiento sobre componentes tecnológicos relacionados con la alimentación pecuaria que tienen diferentes tipos de productores en el norte de Sinaloa. Tres grupos de productores de Ahome, El Fuerte y Guasave fueron seleccionados por muestreo no probabilístico. Los productores entrevistados cuentan con conocimiento diferenciado respecto a la utilización de componentes relacionados con la a...

  15. Modelación de la aptitud ingeniero geológica de los suelos de la ciudad de Luanda

    Directory of Open Access Journals (Sweden)

    Gabriela J. Pereira Teixeira-Pires

    2016-05-01

    Full Text Available Este trabajo tuvo como objetivo obtener, mediante lógica difusa, un modelo espacial de aptitud de los suelos de la ciudad de Luanda a partir de dos parámetros: litología y pendiente. Se detectaron zonas favorables para la construcción civil (infraestructuras urbanas y viales y sectores con comportamiento diferenciado que pueden condicionar riesgos, lo que exige un reordenamiento territorial. El modelo establece orientaciones para la confección de la carta geotécnica para la ciudad de Luanda, y sirve como instrumento que ayuda en el planeamiento territorial.

  16. Adenocarcinoma de endometrio de patrón sertoliforme

    OpenAIRE

    Baquedano M, Laura; Puig F, Fernando; Rubio C, Patricia; Angel Ruiz C, Miguel

    2012-01-01

    Se presenta el caso de una paciente que consultó por metrorragia posmenopaúsica. En la biopsia histeroscópica dirigida se informó de adenocarcinoma de endometrio endometrioide bien diferenciado. Se practicó histerectomía, doble anexectomía y lavados peritoneales. Durante el acto quirúrgico se valoró el grado de infiltración miometrial, que al revelar afectación del útero hasta la serosa, implicó la realización de linfadenectomía de espacios pélvicos y paraaórtico. El diagnóstico definitivo an...

  17. Diseño de un sistema de gestión empresarial adaptado a las PYMEs del sector textil cuya producción se basa en el tisaje de tejidos para el hogar

    OpenAIRE

    Díaz García, Pablo

    2011-01-01

    El presente trabajo de investigación trata de uno de los pilares que sustentarán el devenir de las empresas del sector textil ante los nuevos retos que supone la nueva competencia ejercida por los países asiáticos. Estos pilares, innovación aplicada a productos y procesos, capacidad de desarrollo de artículos con diseño diferenciado y gestión eficaz de las empresas constituirán los elementos necesarios para la supervivencia del sector. El contenido de esta investigación propone un modelo e...

  18. MESIANISMO EN EL PENSAMIENTO AMBIENTAL LATINOAMERICANO

    Directory of Open Access Journals (Sweden)

    Sánchez Buitrago Dairo

    2008-07-01

    Full Text Available Se procura mostrar las formas de autoritarismo simbólico con las cuales las ideologías mesiánicas presentes en el pensamiento ambiental latinoamericano mantienen su cohesión ideológica, evidenciando las configuraciones simbólicas y las acciones que muestran la manera como estas simbologías se observan. Para ello, se argumentará la distinción y la coevolución entre el sentido antropocéntrico y el sentido diferenciado no­antropocéntrico.

  19. Conceptualización de la publicidad institucional en su dimensión socializadora y educativa

    OpenAIRE

    Alfonso Cortés González

    2008-01-01

    En este texto, se teoriza y se propone una definición específica de publicidad institucional. Ésta, debe ser entendida como un fenómeno bien diferenciado de la publicidad comercial por sus interpretaciones académicas y, sobre todo, por su bien diferenciada finalidad. Se tendrán en cuenta, la teoría de la publicidad, de la persuasión, el derecho político, la legislación vigente y las dimensiones sociológicas de la cuestión.

  20. Teatro y traducción (inglés-español). Análisis comparativo de traducciones comerciales. Who's Afraid of Virginia Woolf?

    OpenAIRE

    Andaluz Pinedo, Olaia

    2015-01-01

    El presente trabajo se centra en un análisis comparativo en varios niveles de las traducciones producidas a partir de la obra teatral Who’s Afraid of Virginia Woolf? (Albee 1962): las de Marcelo De Ridder, José Méndez y Alberto Mira, realizadas con distintos fines y en momentos histórico culturales diferenciados. Asimismo hemos integrado en la comparación la adaptación cinematográfica y los correspondientes textos audiovisuales en inglés y en español, con el fin de ofrecer una visión más incl...

  1. Estudo da recuperação de frutose produzida na sintese enzimatica "in vitro" de dextrana

    OpenAIRE

    Maria Eugenia Cavenaghi

    1999-01-01

    Resumo: A dextrana é um biopolímero, com grande potencial industrial, produzido principalmente pelo microorganismo Leuconostoc mesenteroides e formado por resíduos de glicose unidos por ligações a-1,6. Este polissacarídeo apresenta hoje diversas aplicações em alimentos, produtos farmacêuticos, cosméticos, indústrias química e fotográfica, devido provavelmente às inúmeras pesquisas realizadas. As características e propriedades da dextrana são muito específicas e seu uso é diferenciado de acord...

  2. La sátira en los Cuentos chinos de Abraham Valdelomar

    Directory of Open Access Journals (Sweden)

    Ricardo Silva-Santisteban Ubilluz

    2014-06-01

    Full Text Available Abraham Valdelomar nació en Ica en 1888 y falleció trágicamente en Ayacucho en 1919, luego de una corta pero deslumbrante carrera literaria en la que acometió todos los géneros literarios. En Valdelomar se ha privilegiado al admirable cuentista que fue con detrimento del poeta, el ensayista y el dramaturgo en una obra vasta y desigual en que se destacan dos tonos nítidamente diferenciados: uno exotista y artificial y otro en que se respira y palpa el ambiente de su aldea natal.

  3. Una revisión del proceso de la logística inversa y su relación con la logística verde

    OpenAIRE

    Vicente Reyes De León; Daniel Zavala Rio; Jorge Gálvez Choy

    2008-01-01

    A nivel mundial, al menos en los países industrializados, el desarrollo de la práctica de Logística Inversa se presenta como una ventaja competitiva significante. Se identifican tres motivos bien diferenciados que promueven el desarrollo y puesta en marcha de esta práctica, y estos son los legales, los sociales y los económicos. Cualquier empresa que planee implementar la Logística Inversa dentro de sus estrategias a mediano y largo plazo, debe identificar con claridad sus alcances, limitacio...

  4. El Cid en la ópera italiana (siglo XVIII) : génesis y trayectorias

    OpenAIRE

    López Verdejo, Miguel

    2016-01-01

    Esta Tesis de Doctorado surge del interés por dos ámbitos de estudio bien diferenciados, la Literatura y la Música, pero que tienen la capacidad de confluir de diferente modo, dando lugar a expresiones artísticas muy concretas. Una de ellas, la canción, es sin duda la forma musical más extendida en la actualidad. Otra, lo es la ópera, que constituye un espectáculo con una historia apasionante y que hoy en día sigue atrayendo a críticos e investigadores. La bibliografía en español sobre la ...

  5. Espina bífida /

    OpenAIRE

    Lucas Santos, Alma María

    2013-01-01

    El tema se centra en la espina bífida, se expone su definición, etiología, incidencia, los tipos bien diferenciados y sus consecuencias, cómo evoluciona el niño en el desarrollo cognitivo, emocional, social, en el funcionamiento sexual y en la autonomía personal. Se trata también la influencia que tiene esta enfermedad sobre la familia, así como el comienzo de la vida escolar en los niños con espina bífida, las dificultades que tienen en las diversas áreas de matemáticas, lenguaje y conocimie...

  6. DIREITO AGRÁRIO E O TRATAMENTO DOS CONTRATOS AGRÁRIOS ATÍPICOS

    OpenAIRE

    Fabrício Pinto Weiblen; Marcelo Scherer da Silva; Tarso Wayhs Tech; José Fernando Lutz Coelho

    2012-01-01

    Aborda a necessidade de um tratamento adequado e diferenciado aos contratos agrários atípicos em face das complexas relações que se desenvolvem no meio rural atualmente. Apresenta ainda uma visão crítica a respeito das características e aplicabilidade da legislação agrária no cenário jurídico e propõe alternativas com o objetivo de uma prestação mais eficiente do Direito Agrário na área contratual.

  7. Estrés psicosocial : algunos aspectos clínicos y experimentales

    OpenAIRE

    Molina Jiménez, Tania; Gutiérrez García, Ana G.; Hernández Domínguez, Lizette; Contreras, Carlos M.

    2008-01-01

    El presente trabajo aborda conceptos actuales del estrés, resaltando el de tipo social. El estrés psicosocial es un factor que predispone al desarrollo de diversas enfermedades en el ser humano cuyos efectos impactan sobre su calidad de vida y de salud. Se han identificado y diferenciado algunos de los factores sociales que producen estrés. Sin embargo, dadas las dificultades metodológicas y éticas para estudiar los efectos del estrés psicosocial en el ser humano, ha sido necesario diseñar mo...

  8. Búsqueda de recursos en redes peer-to-peer totalmente descentralizadas basada en redes neuronales artificiales

    OpenAIRE

    Corbalán, Leonardo César

    2014-01-01

    Las redes Peer-to-Peer (P2P) puras no estructuradas como Gnutella, dónde los nodos se conectan entre sí como pares o iguales, sin roles diferenciados ni jerarquías de ninguna clase, son sistemas distribuidos, dinámicos, sin punto alguno de centralización, que favorecen la robustez y tolerancia a fallos. Sin embargo, la búsqueda de recursos en estos sistemas constituye un problema esencial. El algoritmo de búsqueda BFS de Gnutella genera gran cantidad de tráfico dificultando su escalabilidad. ...

  9. El anticlinal y las discordancias de Pareja (Guadalajara): definición de las unidades cenozoicas de la Depresión Intermedia (provs. Cuenca y Guadalajara, España)

    OpenAIRE

    Torres Pérez-Hidalgo, Trinidad José

    2006-01-01

    Este trabajo contempla las unidades representadas en la sección estratigráfica del Anticlinal la Pareja (Guadalajara, España) en la cuenca cenozoica denominada Depresión Intermedia. La columna estratigráfica de la zona permite identificar tres unidades principales separadas por discordancias angulares relacionables con fases tectónicas de la orogenia alpina. También se han diferenciado subunidades que, en su mayor parte, vienen definidas por rupturas sedimentarias ligadas a proces...

  10. MEANINGS OF NEW LUXURY: A STUDY ABOUT THE BRAND NESPRESSO AND ITS CONSUMERS

    OpenAIRE

    MARCELA MARIA GALLINAL CUENCA

    2009-01-01

    Nas duas últimas décadas, o mercado de luxo tem passado por grandes transformações. Em particular, surgiu o que o mercado e alguns autores chamam de novo luxo. Esse novo mercado comporta o movimento masstige, que designa as iniciativas de algumas empresas de produtos de massa que vêm tentando atingir um público exigente e de poder aquisitivo elevado por meio do desenvolvimento de produtos sofisticados e diferenciados (COSTA, 2008). Trata-se de um mercado promissor em termos ...

  11. Estratégia e a internet: estudos de casos em empresas brasileiras

    OpenAIRE

    Claudio Luis Cruz de Oliveira; Fernando José Barbin Laurindo

    2016-01-01

    Resumo Esta pesquisa explora um período bastante peculiar e rico em experiências na internet brasileira, no qual as empresas utilizavam a internet como ferramenta estratégica a fim de obter um posicionamento diferenciado em contrapartida às iniciativas atuais, que utilizam modelos predefinidos para obter eficiência operacional. Através de estudos de caso (e-commerce de carros, operador portuário e internet banking) observou-se que: (a) a coerência da estratégia de negócios on-line pode trazer...

  12. Estratégia e a internet: estudos de casos em empresas brasileiras

    OpenAIRE

    Oliveira, Claudio Luis Cruz de; Laurindo, Fernando José Barbin

    2015-01-01

    Resumo Esta pesquisa explora um período bastante peculiar e rico em experiências na internet brasileira, no qual as empresas utilizavam a internet como ferramenta estratégica a fim de obter um posicionamento diferenciado em contrapartida às iniciativas atuais, que utilizam modelos predefinidos para obter eficiência operacional. Através de estudos de caso (e-commerce de carros, operador portuário e internet banking) observou-se que: (a) a coerência da estratégia de negócios on-line pode trazer...

  13. El espacio público : Crisis actual, el espacio público latinoamericano

    OpenAIRE

    Bares, Enrique

    1998-01-01

    Quizás es una de las cuestiones centrales, en la cotidiana problemática de la organización del espacio, por lo cual esta relación de espacio y sociedad encierra uno de los conflictos más complejos de poder analizar y comprender con el fin de proponer alternativas espaciales superadoras. Es indudable que en un mundo que se globaliza y su población crece en forma exponencial, especialmente en América Latina donde la fragmentación social alcanza niveles cada vez más diferenciados, plan...

  14. Cambios en el bienestar de los consumidores argentinos tras la adopción de políticas de etiquetado de alimentos

    OpenAIRE

    Lacaze, María Victoria

    2009-01-01

    Las decisiones de consumo están influenciadas por factores culturales, sociales y personales, cuya incidencia se ha acentuado aún más en esta era de la globalización. En los mercados de alimentos, este fenómeno se ha visto reflejado en una mayor demanda de productos diferenciados y de alto valor, que surge ante la proliferación del deseo de consumir atributos específicos relacionados con la seguridad, conveniencia, salud, nutrición, ética, etc., algunos de los cuales presentan características...

  15. Proceso de Internacionalización y aproximación a la logística de servicios: TELMEX COLOMBIA

    OpenAIRE

    Díaz Mora, Marcela del Pilar; Pizza Ramírez, Nathalya Carolina; Salamanca López, Juan Sebastián

    2013-01-01

    Telmex es una organización que inicia su operación como empresa estatal mexicana con bajos niveles de eficiencia, posterior a su privatización tomó un nuevo rumbo en sus procesos internos, llevándola a generar modelos de negocio diferenciados y enfocados a la prestación de servicios de telecomunicación a la vanguardia. A partir de la búsqueda de nuevos horizontes la compañía logra tener presencia en la mayoría de los países del continente americano operando bajo la marca de “Telmex Internaci...

  16. El metabolismo de los hidratos de carbono en cultivo primario de hepatocitos de rata mantenidos en un medio químicamente definido

    OpenAIRE

    López García, María Pilar

    1987-01-01

    El hígado es un órgano altamente diferenciado que desempeña un papel esencial en el organismo al ser el centro metabólico por excelencia, responsable de la elaboración y distribución de nutrientes. El hepatocito podría considerarse como célula diferenciada típica, dado que es capaz de expresar gran número de funciones altamente especializadas, cuya actividad se modifica cualitativa y cuantitativamente in vivo en respuesta a diferentes condiciones fisiológicas. El im...

  17. Arte, legislación y política en Lima: Siglo XVIII

    Directory of Open Access Journals (Sweden)

    Martha Barriga Tello

    2011-05-01

    Full Text Available El presente trabajo tiene por objeto establecer las relaciones entre política,legislación y producción artística durante el siglo XVIII en el Virreynatodel Perú. Se establecen, así, tres momentos diferenciados en los que elEstado mostró su preocupación por el patrimonio artístico y la actividadvinculada al arte. El estudio se centra en la legislación local y en la peninsularque normaron esta actividad y en el papel que los agentes relacionadoscon el arte desempeñaron durante ese siglo.

  18. Proceso constructivo de redes de distribución de gas natural, residencial y comercial en Lima y Callao

    OpenAIRE

    Medina Yupanqui, Jorge Nander; Medina Yupanqui, Jorge Nander; Medina Yupanqui, Jorge Nander

    2015-01-01

    Las redes de gas natural están presentes en diferentes distritos de Lima y Callao, y son de tres tipos diferenciados por la presión que soportan; red de alta presión (red principal que cruza Lima), la red de media presión (abastece generadoras eléctricas, industrias y grifos de GNV), y la red de baja presión (abastece viviendas y comercios). La red de alta presión que cruza todo Lima es para el consumo actual, garantiza la conducción para el abastecimiento de gas a Lima y Callao. Las re...

  19. Enraizamento de estacas apicais de figueira 'Roxo de Valinhos' em função de época de coleta e AIB

    OpenAIRE

    Ohland,Tatiane; Pio,Rafael; Chagas,Edvan Alves; Barbosa,Wilson; Kotz,Tailene Elisa; Daneluz,Simone

    2009-01-01

    Estacas apicais de figueira 'Roxo de Valinhos' coletadas em épocas distintas, podem apresentar enraizamento diferenciado, o que propiciará, na prática, saber em qual época devem-se aproveitar as estacas para a produção de mudas. Objetivou-se, no presente trabalho, avaliar a época de coleta e o tratamento com AIB, no enraizamento de estacas apicais da figueira 'Roxo de Valinhos'. Estacas caulinares lenhosas da porção apical dos ramos, coletadas no final da primeira quinzena dos meses de maio, ...

  20. Somatometria, obesidad y sobrepeso en estudiantes de educación básica de la frontera norte de México. Un análisis a partir de la ENSE 2008

    OpenAIRE

    Salvador Ponce Serrano

    2013-01-01

    La prevalencia de exceso de peso (sobrepeso más obesidad) en la población de las escuelas primarias y secundarias en México ha ido en aumento y tiene tendencia ascendente. Estas condiciones se asocian a la presencia de enfermedades crónicas degenerativas en el futuro y a dificultades escolares diversas. El exceso de peso es un problema de salud pública sobre todo en los estados de la frontera norte, con peculiaridades, según entidad federativa, por lo que un análisis diferenciado permite iden...

  1. A ESTRATÉGIA DO OCEANO AZUL: UM ESTUDO DE CASO EM UMA EMPRESA DE SERVIÇOS NA CIDADE DE CAMPINA GRANDE – PB

    OpenAIRE

    Xavier, Leandro Correia; Parque Tecnológico da Paraíba (PaqTec/PB); Barbosa, Robson Fernandes; Universidade Federal de campina Grande - UFCG; Sousa, Jackson Epaminondas de; Universidade Federal de Campina Grande - UFCG; Barbosa, Diego Fernandes; INFRAERO; Alexandre, Stefane Nogueira; UFCG

    2015-01-01

    As empresas se utilizam de estratégias e atitudes para chegar a um determinado objetivo, observando os pontos fortes e fracos do ambiente interno e externo da organização. Assim, têm-se a teoria do trade-off (valorXcusto) no qual as empresas sempre optam por um de dois caminhos: agregar valor ao produto para cobrar mais, ou o cobrar menor preço com um produto menos diferenciado. Hoje, emerge no mundo científico um novo paradigma, a estratégia do oceano azul, a qual afirma que é possível as em...

  2. Consideraciones gráficas y lingüísticas del lenguaje cibernético: el chat y el Messenger.

    OpenAIRE

    Cabedo Nebot, Adrián

    2009-01-01

    Este trabajo pretende estudiar el comportamiento lingüístico de intercambios comunicativos en plataformas cibernéticas como el chat o el Messenger. Así mismo, el planteamiento inicial es investigar si el lenguaje cibernético constituye un código particular, diferenciado del código del lenguaje habitual. This work tries to study linguistic behavior of communicative exchanges in cybernetic platforms like chat or Messenger. Likewise, the initial approach is to investigate if the cybernetic la...

  3. Polímeros entrecruzados a base de PVC : síntesis, caracterización y propiedades

    OpenAIRE

    Hidalgo Fierro, Manuel

    1997-01-01

    La modificación de polímeros es uno de los métodos mas rápidos, económicos y eficaces para la obtención de materiales con propiedades mejoradas a partir de polímeros convencionales. En este trabajo se ha desarrollado la síntesis de polímeros entrecruzados a base de policloruro de vinilo, empleando para ello dos métodos bien diferenciados: en primer lugar, se han obtenido polímeros entrecruzados en un solo paso, mediante procesado reactivo en estado fundido con organosilanos, lo que confiere...

  4. Determinação de danos do gorgulho, Conotrachelus Psidii Marshall e captura de mosca-das-frutas, Anastrepha fFaterculus Wiedemann, com óleo de andiroba, Carapa Guianensis em goiabeira serrana Acca Sellowiana

    OpenAIRE

    Rosa, Joatan Machado da

    2011-01-01

    A goiabeira-serrana (Acca sellowiana (Berg) Burret) pertencente a família Myrtaceae, é uma espécie nativa com ampla dispersão nos planaltos meridionais do sul do Brasil. Além de espécie nativa e produzir frutos de odor e sabor diferenciado, razão pela qual seu cultivo comercial é incentivado pelo Departamento de Conservação da Biodiversidade do Ministério do Meio Ambiente. A goiabeira serrana tem sido cultivada sob os sistemas orgânico, convencional, ou ainda, os frutos coletad...

  5. Determinação de danos do gorgulho, Conotrachelus psidii Marshall e captura de mosca-das-frutas, Anastrepha fraterculus Wiedemann, com óleo de andiroba, Carapa guianensis em goiabeira serrana Acca sellowiana. Lages-SC 2011

    OpenAIRE

    Rosa, Joatan Machado da

    2011-01-01

    A goiabeira-serrana (Acca sellowiana (Berg) Burret) pertencente a família Myrtaceae, é uma espécie nativa com ampla dispersão nos planaltos meridionais do sul do Brasil. Além de espécie nativa e produzir frutos de odor e sabor diferenciado, razão pela qual seu cultivo comercial é incentivado pelo Departamento de Conservação da Biodiversidade do Ministério do Meio Ambiente. A goiabeira serrana tem sido cultivada sob os sistemas orgânico, convencional, ou ainda, os frutos coletad...

  6. Clasificación de los proyectos informáticos y establecimiento de sus EDT's

    OpenAIRE

    Huerta de la Morena, Beatriz

    2014-01-01

    El objetivo principal del presente proyecto es plasmar una clasificación de los diferentes tipos de proyectos informáticos existentes hoy en día. Presentamos una clasificación basada en algunos criterios diferenciadores para finalmente seleccionar una tipología de proyectos informáticos fuertemente diferenciados entre sí. Posteriormente analizaremos de forma exhaustiva las diferentes etapas y fases de las que se componen, con el fin de conocer las diferentes técnicas de trabajo para la correc...

  7. La arquitectura teatral griega constituye una analogía del cuerpo humano cósmico y político

    OpenAIRE

    Roche Cárcel, Juan Antonio

    2017-01-01

    En este artículo, la arquitectura teatral de la Grecia Antigua va a ser considerada como un cuerpo-signo que significa, construido social, cultural y políticamente, como un reflejo y creador del orden social, como un cuerpo que es civilización y, por consiguiente, como un microcosmos de la concepción del mundo de los griegos antiguos. Y es que la arquitectura teatral es vista por los helenos como un cuerpo articulador, delimitado, diferenciado y separado y con entradas o salidas que comunican...

  8. Variabilidade espacial da produtividade do feijoeiro e atributos físicos em dois sistemas de preparo do solo

    OpenAIRE

    Longui, Flávio Coutinho

    2015-01-01

    É importante considerar a variabilidade espacial de solos sempre que a amostragem de campo for efetuada, pois pode indicar locais que necessitam de tratamento diferenciado quanto ao preparo, sem prejuízo para a representatividade, possibilitando maior detalhamento da área. Com o surgimento e desenvolvimento da agricultura de precisão, o estudo geoestatístico dos atributos físicos do solo com a relação da produtividade do feijão vem se intensificando. Observa-se que as variabilidades espaciais...

  9. Implantação de programas da qualidade pela certificação ISO 9001 como diferencial competitivo para as organizações

    OpenAIRE

    Luz, Carolina

    2002-01-01

    Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção. O êxito de muitas organizações, até pouco tempo sustentado por sistemas operacionais diferenciados, depende atualmente de outros fatores mais complexos, principalmente os ligados a estratégias de atendimento e monitoramento da satisfação dos clientes. O presente trabalho identifica e caracteriza a implantação de programas da qualidade pela certificação ...

  10. Con otro acento. El spanglish visto desde esta orilla

    OpenAIRE

    Serra Alegre, Enric; Betti, Silvia

    2016-01-01

    Este libro colectivo proyecta una mirada distinta, abierta y crítica sobre las actitudes lingüísticas de una sociedad heterogénea y multicultural que vive en los Estados Unidos, los hispanounidenses. Un rasgo lingüístico, utilizado por buena parte de estos latinos, es el cambio de código, que se considera entre los aspectos más característicos del llamado popularmente spanglish. Cada uno de los trabajos recogidos en este volumen aporta un enfoque diferente y un tratamiento diferenciado del te...

  11. Los retos de la democracia mexicana: una ciudadanía sin discriminación

    Directory of Open Access Journals (Sweden)

    Ma. Aidé Hernández García

    2011-01-01

    por lo que se propone la existencia de derechos diferenciados. La segunda premisa es apuntar que estos derechos ciudadanos no se pueden ejercer ampliamente si existe una cultura de la discriminación, pues aunque haya leyes que favorezcan al desarrollo de una ciudadanía plena, si la sociedad excluye a ciertos grupos los está condenando no sólo a la pobreza sino también a tener una baja autoestima y una concepción de inferioridad, actitud que los lleva a no considerarse sujetos de derecho.

  12. Desenvolvimento de Cerveja Artesanal com Acerola (Malpighia emarginata DC) e Abacaxi (Ananas comosus L. Merril)

    OpenAIRE

    Pinto, L. I. F.; Universidade Federal do Ceará; Zambelli, R. A.; Universidade Federal do Ceará -UFC; Santos Junior, E. C.; Universidade Federal de Santa Catarina - UFSC; Pontes, D. F.; Universidade federal do Ceará - UFC

    2015-01-01

    A cerveja é a bebida alcoólica mais consumida no mundo. Estando bem relacionado com festividades e comemorações, porém essa bebida contém uma variedade de compostos bioativos, vitaminas e minerais, capazes de promover benefícios quando a sua ingestão é feita de maneira moderada. O mercado está a cada dia buscando produtos diferenciados e até exclusivos, surge assim o campo das cervejas artesanais. O objetivo deste trabalho foi desenvolver uma cerveja artesanal com acerola e abacaxi, trazendo ...

  13. Exposure of Free-Ranging Wild Carnivores and Domestic Dogs to Canine Distemper Virus and Parvovirus in the Cerrado of Central Brazil.

    Science.gov (United States)

    Furtado, Mariana Malzoni; Hayashi, Erika Midori Kida; Allendorf, Susan Dora; Coelho, Claudio José; de Almeida Jácomo, Anah Tereza; Megid, Jane; Ramos Filho, José Domingues; Silveira, Leandro; Tôrres, Natália Mundim; Ferreira Neto, José Soares

    2016-09-01

    Human population growth around protected areas increases the contact between wild and domestic animals, promoting disease transmission between them. This study investigates the exposure of free-ranging wild carnivores and domestic dogs to canine distemper virus (CDV) and parvovirus in Emas National Park (ENP) in the Cerrado savanna of central Brazil. Serum samples were collected from 169 wild carnivores, including the maned wolf (Chrysocyon brachyurus), crab-eating fox (Cerdocyon thous), hoary fox (Pseudalopex vetulus), puma (Puma concolor), ocelot (Leopardus pardalis), pampas cat (Leopardus colocolo), jaguarundi (Herpailurus yagouaroundi), striped hog-nosed skunk (Conepatus semistriatus) and coati (Nasua nasua), and from 35 domestic dogs living on rural properties bordering ENP. Serological tests showed that 10.6% of wild carnivores (maned wolves, crab-eating foxes and ocelots) and 71.4% of domestic dogs were exposed to CDV, and 56.8% of wild carnivores, including all species sampled except coatis, and 57.1% of domestic dogs were exposed to parvovirus. This report is the first to indicate that the free-ranging pampas cat, jaguarundi and striped hog-nosed skunk are exposed to parvovirus. CDV and parvovirus deserve attention in ENP, and it is extremely important to monitor the health of carnivore populations and perform molecular diagnosis of the viruses to determine the possible involvement of the domestic dog in their transmission.

  14. Nasca Lines, Peru

    Science.gov (United States)

    2001-01-01

    The Nasca Lines are located in the Pampa region of Peru, the desolate plain of the Peruvian coast 400 km south of Lima. The Lines were first spotted when commercial airlines began flying across the Peruvian desert in the 1920's. Passengers reported seeing 'primitive landing strips' on the ground below. The Lines were made by removing the iron-oxide coated pebbles which cover the surface of the desert. When the gravel is removed, they contrast with the light color underneath. In this way the lines were drawn as furrows of a lighter color. On the pampa, south of the Nasca Lines, archaeologists have now uncovered the lost city of the line-builders, Cahuachi. It was built nearly two thousand years ago and was mysteriously abandoned 500 years later. This ASTER sub-image covers an area of 14 x 18 km, was acquired on December 22, 2000, and is located at 14.7 degrees south latitude and 75.1 degrees west longitude. The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

  15. Male sterility of triticale lines generated through recombination of triticale and rye maintainers

    Directory of Open Access Journals (Sweden)

    Tomasz Warzecha

    2014-11-01

    Full Text Available The Triticum timopheevi cytoplasmic male sterility (cms system in triticale (xTriticosecale Wittmack suffers from a low frequency of maintainers and environmental instability of the male sterility. On the other hand, the Pampa cms system in rye (Secale cereale exhibits strong male sterility and a low frequency of restorers. Here, we report generating hybrids between maintainers of the T. timopheevi cms system in triticale and maintainers of the rye Pampa cms system. Ten hybrids were obtained. Their hybridity was verified by PCR (polymerase chain reaction using ISSR (inter simple sequence repeats primers. The cms maintaining ability of F2 individuals and their progeny was tested. The F2 plants were crossed to male sterile lines of triticale carrying the T. timopheevi cytoplasm. Among 180 G1 offspring of these crosses, 71 (39.4% were completely male sterile. Fourteen F2 individuals (7.8%, as well as their F2S1 and progeny, generated stable male sterility in G1, G1BC1 and G1BC2 generations after the crosses. Our results suggest that it is possible to produce a more stable cms system in triticale based on the T. timopheevi cytoplasm as compared to the existing one.

  16. Genetic analysis identifies the region of origin of smuggled peach palm seeds.

    Science.gov (United States)

    Cristo-Araújo, Michelly; Molles, David Bronze; Rodrigues, Doriane Picanço; Clement, Charles R

    2017-04-01

    Seeds of a plant, supposedly a palm tree known popularly as peach palm (Bactris gasipaes), were seized by the Federal Police in the state of Pará, Brazil, without documentation of legal origin to authorize transportation and marketing in Brazil. They were alleged to be from the western part of Amazonas, Brazil, near the frontier with Peru and Colombia, justifying the lack of documentation. The species was confirmed to be peach palm. To determine the likely place of origin, a genetic analysis was performed to determine the relationship between the seized seeds and representative populations of peach palm from all of Amazonia, maintained in the Peach palm Core Collection, at the National Research Institute for Amazonia, using nine microsatellite loci. Reynolds' coancestry analysis showed a strong relationship between the seeds and the Pampa Hermosa landrace, around Yurimaguas, Peru. The Structure program, used to infer the probability of an individual belonging to a given population, showed that most seeds grouped with populations close to Yurimaguas, Peru, corroborating the coancestry analysis. The Pampa Hermosa landrace is the main source of spineless peach palm seeds used in the Brazilian heart-of-palm agribusiness, which motivated the smugglers to attempt this biopiracy. Copyright © 2017 Elsevier B.V. All rights reserved.

  17. Vertebrate road kill survey on a highway in southern Brazil

    Directory of Open Access Journals (Sweden)

    Luiz Liberato Costa Corrêa

    2017-06-01

    Full Text Available Highways are a major factor acting in the decline of several wildlife populations. Impact occurs due to the continuous flow of motor vehicles over tracks and collision with animals using the same area. This study aimed to list road killed wild vertebrates found in highways in the Pampa Biome, state of Rio Grande do Sul, over an entire year. The taxa found (amphibians, reptiles, birds and mammals were identified to species level and their frequency of occurrence was seasonally registered. Along 2,160 km, we found 318 road killed individuals, totaling 65 species. This number represents an average of 0.147 road killed specimens by kilometer (that is, 1 individual each 7 km. Of these, seven species are under threat of extinction in the state of Rio Grande do Sul. We also found a seasonal pattern among road kills, in which the highest number of road killed animals was registered in the summer and spring months. These results contribute to increase knowledge about which species are most impacted by road kill on highways of the Pampa Biome. Such data can be used as an indicator for the implementation of measures by competent bodies to mitigate impacts of highways in the state of Rio Grande do Sul.

  18. Improved oral bioavailability of valsartan using proliposomes: design, characterization and in vivo pharmacokinetics.

    Science.gov (United States)

    Nekkanti, Vijaykumar; Venkatesan, Natarajan; Wang, Zhijun; Betageri, Guru V

    2015-01-01

    The objective of our investigational work was to develop a proliposomal formulation to improve the oral bioavailability of valsartan. Proliposomes were formulated by thin film hydration technique using different ratios of phospholipids:drug:cholesterol. The prepared proliposomes were evaluated for vesicle size, encapsulation efficiency, morphological properties, in vitro drug release, in vitro permeability and in vivo pharmacokinetics. In vitro drug-release studies were performed in simulated gastric fluid (pH 1.2) and purified water using dialysis bag method. In vitro drug permeation was studied using parallel artificial membrane permeation assay (PAMPA), Caco-2 monolayer and everted rat intestinal perfusion techniques. In vivo pharmacokinetic studies were conducted in male Sprague Dawley (SD) rats. Among the proliposomal formulations, F-V was found to have the highest encapsulation efficiency of 95.6 ± 2.9% with a vesicle size of 364.1 ± 14.9 nm. The in vitro dissolution studies indicated an improved drug release from proliposomal formulation, F-V in comparison to pure drug suspension in both, purified water and pH 1.2 dissolution media after 12 h. Permeability across PAMPA, Caco-2 cell and everted rat intestinal perfusion studies were higher with F-V formulation as compared to pure drug. Following single oral administration of F-V formulation, a relative bioavailability of 202.36% was achieved as compared to pure valsartan.

  19. Regional simulation of interannual variability over South America

    Science.gov (United States)

    Misra, V.; Dirmeyer, P. A.; Kirtman, B. P.; Juang, H.-M. Henry; Kanamitsu, M.

    2002-08-01

    Three regional climate simulations covering the austral summer season during three contrasting phases of the El Niño-Southern Oscillation cycle were conducted with the Regional Spectral Model (RSM) developed at the National Centers for Environmental Prediction (NCEP). The simulated interannual variability of precipitation over the Amazon River Basin, the Intertropical Convergence Zone, the Pacific and Atlantic Ocean basins, and extratropical South America compare reasonably well with observations. The RSM optimally filters the peturbations about a time-varying base field, thereby enhancing the information content of the global NCEP reanalysis. The model is better than the reanalysis in reproducing the observed interannual variability of outgoing longwave radiation at both high frequencies (3-30 days) and intraseasonal (30-60 days) scales. The low-level jet shows a peak in its speed in 1998 and a minimum in the 1999 simulations. The lag correlation of the jet index with convection over various areas in continental South America indicates that the jet induces precipitation over the Pampas region downstream. A detailed moisture budget was conducted over various subregions. This budget reveals that moisture flux convergence determines most of the interannual variability of precipitation over the Amazon Basin, the Atlantic Intertropical Convergence Zone, and the Nordeste region of Brazil. However, both surface evaporation and surface moisture flux convergence were found to be critical in determining the interannual variability of precipitation over the southern Pampas, Gran Chaco area, and the South Atlantic Convergence Zone.

  20. ¡Puro gringo! Perfiles de la inmigración italiana en las colonias santafesinas

    Directory of Open Access Journals (Sweden)

    Adriana Cristina Crolla

    2015-01-01

    Full Text Available La radicación de italianos en las llanuras del interior argentino tuvo perfiles particulares, en especial en la pampa santafesina, gracias al impacto de las políticas provinciales en la distribución de la tierra. Política que permitió la fundación de “colonias”, el trazado de una impresionante red de vías férreas y de caminos que hicieron cambiar sustancialmente los modos y fluencias en las comunicaciones y regulaciones económicas, culturales y sociales de la región y del país. El factor extranjero hace que se sancione el nombre “Pampa Gringa” (en sustancia “habitada por extranjeros” a la zona (la que también comprende al este de Córdoba. Y por extensión, dada su masividad numérica, “gringo” al italiano. Apelativo que hoy día define orgullosamente la identidad de sus habitantes, descendientes en un 70% de aquel aluvión itálico. El trabajo propone un breve recorrido histórico, un análisis de los alcances del término y su emergencia en la literatura argentina y local.

  1. Study of Phytoremediation Capability in Sulfate Removal from Water

    Directory of Open Access Journals (Sweden)

    Milad Tafazoli

    2014-07-01

    Full Text Available Phytoremediation is known as a pollutants method with low cost, without operational complexity, with low energy consumption and no need for sludge disposal. In this study, hydroponic cultivation was chosen for estimation of sulfate removal as a significant sulfur compound in effluents on two fenny plants: pampas grass and bamboo.In this case, the plants were examined under two different retention times and after determining the optimum time (7 days, the main experiments were done for evaluating the plants removal efficiency and sulfate mass absorbance by plants. For better analysis, T-Test and ANOVA with significant influence (p < 0.05% were also done. Finally, the removal efficiency in pampas grass for all concentrations of 50, 200, 300, 600, 900, 1200, 1500 and 3000 mg/L were 44, 36, 34.22, 30.55, 15.93, 9.72, 7.77 and 4.44 percent, respectively, which were up to two times higher for the bamboos.

  2. Recurrent evolution of melanism in South American felids.

    Directory of Open Access Journals (Sweden)

    Alexsandra Schneider

    2015-02-01

    Full Text Available Morphological variation in natural populations is a genomic test bed for studying the interface between molecular evolution and population genetics, but some of the most interesting questions involve non-model organisms that lack well annotated reference genomes. Many felid species exhibit polymorphism for melanism but the relative roles played by genetic drift, natural selection, and interspecies hybridization remain uncertain. We identify mutations of Agouti signaling protein (ASIP or the Melanocortin 1 receptor (MC1R as independent causes of melanism in three closely related South American species: the pampas cat (Leopardus colocolo, the kodkod (Leopardus guigna, and Geoffroy's cat (Leopardus geoffroyi. To assess population level variation in the regions surrounding the causative mutations we apply genomic resources from the domestic cat to carry out clone-based capture and targeted resequencing of 299 kb and 251 kb segments that contain ASIP and MC1R, respectively, from 54 individuals (13-21 per species, achieving enrichment of ~500-2500-fold and ~150x coverage. Our analysis points to unique evolutionary histories for each of the three species, with a strong selective sweep in the pampas cat, a distinctive but short melanism-specific haplotype in the Geoffroy's cat, and reduced nucleotide diversity for both ancestral and melanism-bearing chromosomes in the kodkod. These results reveal an important role for natural selection in a trait of longstanding interest to ecologists, geneticists, and the lay community, and provide a platform for comparative studies of morphological variation in other natural populations.

  3. Recurrent evolution of melanism in South American felids.

    Science.gov (United States)

    Schneider, Alexsandra; Henegar, Corneliu; Day, Kenneth; Absher, Devin; Napolitano, Constanza; Silveira, Leandro; David, Victor A; O'Brien, Stephen J; Menotti-Raymond, Marilyn; Barsh, Gregory S; Eizirik, Eduardo

    2015-02-01

    Morphological variation in natural populations is a genomic test bed for studying the interface between molecular evolution and population genetics, but some of the most interesting questions involve non-model organisms that lack well annotated reference genomes. Many felid species exhibit polymorphism for melanism but the relative roles played by genetic drift, natural selection, and interspecies hybridization remain uncertain. We identify mutations of Agouti signaling protein (ASIP) or the Melanocortin 1 receptor (MC1R) as independent causes of melanism in three closely related South American species: the pampas cat (Leopardus colocolo), the kodkod (Leopardus guigna), and Geoffroy's cat (Leopardus geoffroyi). To assess population level variation in the regions surrounding the causative mutations we apply genomic resources from the domestic cat to carry out clone-based capture and targeted resequencing of 299 kb and 251 kb segments that contain ASIP and MC1R, respectively, from 54 individuals (13-21 per species), achieving enrichment of ~500-2500-fold and ~150x coverage. Our analysis points to unique evolutionary histories for each of the three species, with a strong selective sweep in the pampas cat, a distinctive but short melanism-specific haplotype in the Geoffroy's cat, and reduced nucleotide diversity for both ancestral and melanism-bearing chromosomes in the kodkod. These results reveal an important role for natural selection in a trait of longstanding interest to ecologists, geneticists, and the lay community, and provide a platform for comparative studies of morphological variation in other natural populations.

  4. Evaluation of biocontrol ability of native strains of Trichoderma spp on Rhizoctonia and Fusarium sp in coffee (Coffea arabica in experimental conditions

    Directory of Open Access Journals (Sweden)

    Nina Rudy

    2016-06-01

    Full Text Available Due to the indiscriminate use agrochemicals in conventional agriculture, it is causing pollution problems in the environment (soil, air and water, hence the search for alternatives that contribute to agricultural production by agro-chemical free sustainable production. This paper studies the biological control of damping off in coffee (Coffea arabica by applying antagonistic fungus Trichoderma sp. Under experimental conditions at laboratory facilities of the Academic Unit Carmen Pampa Campesina, a community of Carmen Pampa, Township Coroico. The aim of this study was to biologically control the "damping off", they found two genera that cause damping off in seedbed of coffee: Rhizoctonia sp. and Fusarium sp.To determine the percentage of growth and control in the culture medium, we used the method of counting quarters, where they gave the mycelial growth of antagonistic fungus Trichoderma sp., And the fungal pathogens Rhizoctonia sp. and Fusarium sp. Statistically there was a highly significant difference in the variable growth rate of Trichoderma sp. on pathogenic fungi Rhizoctonia sp. and Fusarium sp. at 3, 6 and 9 days that announces the time factor and treatments are interdependent. The control variable showed a highly significant difference in the time factor and treatment, but the interaction shows no significant difference this makes known factors that are independent, so the fungus Trichoderma sp. not depend on time in treatment, thus showing its inhibitory power to Rhizoctonia sp. and Fusarium sp .. This test gives references that there is antagonistic fungus control on the fungal pathogens Rhizoctonia sp. and Fusarium sp.

  5. Spatially explicit inference for open populations: estimating demographic parameters from camera-trap studies.

    Science.gov (United States)

    Gardner, Beth; Reppucci, Juan; Lucherini, Mauro; Royle, J Andrew

    2010-11-01

    We develop a hierarchical capture-recapture model for demographically open populations when auxiliary spatial information about location of capture is obtained. Such spatial capture-recapture data arise from studies based on camera trapping, DNA sampling, and other situations in which a spatial array of devices records encounters of unique individuals. We integrate an individual-based formulation of a Jolly-Seber type model with recently developed spatially explicit capture-recapture models to estimate density and demographic parameters for survival and recruitment. We adopt a Bayesian framework for inference under this model using the method of data augmentation which is implemented in the software program WinBUGS. The model was motivated by a camera trapping study of Pampas cats Leopardus colocolo from Argentina, which we present as an illustration of the model in this paper. We provide estimates of density and the first quantitative assessment of vital rates for the Pampas cat in the High Andes. The precision of these estimates is poor due likely to the sparse data set. Unlike conventional inference methods which usually rely on asymptotic arguments, Bayesian inferences are valid in arbitrary sample sizes, and thus the method is ideal for the study of rare or endangered species for which small data sets are typical.

  6. Diversity and associations between coastal habitats and anurans in southernmost Brazil.

    Science.gov (United States)

    Oliveira, Mauro C L M; Dos Santos, Maurício B; Loebmann, Daniel; Hartman, Alexandre; Tozetti, Alexandro M

    2013-01-01

    This study aimed to verify the relationship between habitat and the composition of anuran species in dune and restinga habitats in southernmost Brazil. The habitats were sampled between April 2009 and March 2010 using pitfalls with drift fence. We have captured 13,508 individuals of 12 anuran species. Species richness was lower in the dunes and dominance was higher in the resting. Apparently the less complex plant cover, water availability, and wide daily thermal variation in dunes act as an environmental filter for frogs. This hypothesis is reinforced by the fact that the most abundant species (Physalaemus biligonigerus and Odonthoprynus maisuma) bury themselves in the sand, minimizing these environmental stresses. Despite being in the Pampa biome, the studied community was more similar to those of coastal restinga environment of southeast Brazil than with other of the Pampa biome. The number of recorded species is similar to those observed in other open habitats in Brazil, showing the importance of adjacent ones to the shoreline for the maintenance of the diversity of anurans in southernmost Brazil.

  7. New records of the Genus Festuca L. (Poaceae for Colombia and Venezuela New records of the Genus Festuca L. (Poaceae for Colombia and Venezuela

    Directory of Open Access Journals (Sweden)

    Stancik Daniel

    2001-07-01

    Full Text Available The genus Festuca L. (Poaceae includes about 350-400 herbaceous species with wide cosmopolitan distribution (Watson & Dallwitz 1992. The center of distribution ofthe genus is in the meadows and steppes of North America and Eurasia. Sorne species are present in Australia, Tasmania, New Zealand, and W and SE Africa. High species diversity is found in the pampas of Argentina and the puna of the Andes, with approximately 40 species in Peru (Tovar 1993,30 in Bolivia (Renvoize 1998, and 30 in Argentina (Türpe 1969. So far, 26 native species are known from the páramos of the northern South America; about seven new species from this region will be described soon (author's unpublished data.The genus Festuca L. (Poaceae includes about 350-400 herbaceous species with wide cosmopolitan distribution (Watson & Dallwitz 1992. The center of distribution ofthe genus is in the meadows and steppes of North America and Eurasia. Sorne species are present in Australia, Tasmania, New Zealand, and W and SE Africa. High species diversity is found in the pampas of Argentina and the puna of the Andes, with approximately 40 species in Peru (Tovar 1993,30 in Bolivia (Renvoize 1998, and 30 in Argentina (Türpe 1969. So far, 26 native species are known from the páramos of the northern South America; about seven new species from this region will be described soon (author's unpublished data.

  8. Geochronologic synthesis of the Piedra Alta Terrane, Uruguay

    International Nuclear Information System (INIS)

    Preciozzi, F.; Peel, E.

    2006-01-01

    In the Pre cordillera of Córdoba there are sixteen bands of ductile deformation, which allows tectonic significance assign them to four groups. One of them, which belongs to Deformation Gaza Tunnels, consists of post metamorphic strips uprooting of Orogen Pampeano Cambrian reverse nature, produced by convergent general shear (transpressional), related to collisional stages terrain Posthumous Pampa against Gondwana margin, and famatinian subduction. New radiometric data obtained by the K / Ar method amphiboles and micas allow better narrow activity tectonics of the strip, which would have nucleated after the M2 metamorphic peak (ca. 534 Ma), uprooted the Orogen Cambrian and Ordovician exhumándolo up early (onset of subduction Famatinian), when located the Charquina (474 ​​Ma) granodiorite. The period of tectonic activity FDLT (ca. 64 Ma), coincide with the approach of land Cuyania the Gondwana margin, prior to placement and final collision in the Middle to Late Ordovician. At the same time, in the field Pampeano they would be producing con tractional stages end collision with terrain Pampa the western margin of Gondwana. Subsequently, the FDLT would have cooled to the middle Silurian, when the Sierras de Cordoba and San Luis They continued their exhumation through isotherm muscovite. After cooling this generalized, deformation occurs and Devonian magmatism that penetrativamente affected the Pre cordillera eastern

  9. The non-nuclear legislation and the communal property

    International Nuclear Information System (INIS)

    Ciallella R, Norberto; Grancelli Cha, Nestor

    1996-01-01

    Since 1984, year in which the Bolson Municipality, Rio Negro province, declared the town a 'Non Nuclear Area', began to appear an abundant legislation that generically, it is know as 'Non Nuclear'. The provinces of Buenos Aires, Chubut, Formosa, La Pampa, Santa Cruz and Tierra del Fuego, have in their respective Constitutions non nuclear articles, while the provinces of Catamarca, Cordoba, Corrientes, Chaco, Entre Rios, Formosa, Rio Negro, San Luis, Santa Cruz, Santa Fe, Tierra del Fuego and Tucuman have sanctioned in their respective jurisdictions non nuclear laws. New projects of these laws are in consideration and treatment in the provinces of Catamarca, La Pampa, Mendoza, Santiago del Estero and Rio Negro. The present work compiles and analyzes the available information on this subject. Although the topic is not regulatory, it could have involved in the regulatory area in an eventual situation that could be presented between regulatory laws of federal and provincials reaches. This work describes the current situation and the probabilities consequences of the mentioned legislation. (author)

  10. Short-term spider community monitoring after cattle removal in grazed grassland

    Directory of Open Access Journals (Sweden)

    Guilherme O. da Silva

    2017-10-01

    Full Text Available ABSTRACT. At the Pampa Biome, grazing, like others disturbances, affects fauna and flora, creating heterogeneity in the environment. Little is known about how the diversity and richness of arthropods change during this impact. To improve the knowledge of how spider diversity is affected by grazing, experiments were realized at Pampa. The hypothesis is that abundance of spider will be different when comparing grazed and ungrazed areas. A paired block, with two areas of one hectare each, was established in three areas in the Environmental Protection Area of Ibirapuitã (APA Ibirapuitã, state of Rio Grande do Sul, Brazil. One of these hectares was closed with fences, excluding the catle grazing, in August of 2012. Samplings were realized in November of 2011, 2012 and 2013 using Pitfall traps filled with formol 4% and disposed in an “X” format in each area. For statistical analyses, T test, ANOSIM, ANOVA and Rarefaction were performed. A total of 1,315 spiders were captured, comprising 77 species or morphospecies belonging to 20 families. The family most abundant was Lycosidae followed by Hahniidae, Linyphiidae and Theridiidae. Linyphiidae was the richest family with 14 species or morphospecies identified. All spiders, adults and juveniles, only adults in species and morphospecies, and most abundant species were used as models for statistics. These models revealed no significant difference between grazed and ungrazed areas after three and 15 months of cattle exclusion.

  11. El matrimonio y la autoconstrucción de alianzas en Sarhua, Ayacucho - Perú

    Directory of Open Access Journals (Sweden)

    1977-01-01

    Full Text Available Cet article analyse le mariage rituel dans la communauté de Sarhua, dans la région du Rio Pampas (Ayacucho. Mettant l'accent sur les catégories sociales et rituelles impliquées dans la cérémonie, les auteurs constatent que le choix de ces catégories explique la structure fondamentale à travers laquelle les alliances sont créées. Cette structure sous entend que les unités de base de l'échange matrimoniale, sont composées de deux groupes de soeurs. Ce cas va l' encontre du paradigme anthropologique qui prévaut, selon lequel les groupes impliqués dans ces échanges sont universellement composés de mâles unis par des liens de parenté. This article analyzes the marriage ritual in the community of Sarhua in the Rio Pampas area of Ayacucho. Focusing on the social and ritual categories involved in the ceremony, it is argued that the election of these categories elucidates the fundamental structure through which alliances are created. This structure implies that the basic units of marriage exchange are composed of two groups of sisters. This case presents a counter-example to the prevailing anthropological paradigm that holds that these interchanging groups (wife-givers and wife-takers are universally composed of genealogically related males.

  12. The non-nuclear legislation and the communal property; La legislacion no nuclear y el bien comun

    Energy Technology Data Exchange (ETDEWEB)

    Ciallella R, Norberto; Grancelli Cha, Nestor

    1996-07-01

    Since 1984, year in which the Bolson Municipality, Rio Negro province, declared the town a 'Non Nuclear Area', began to appear an abundant legislation that generically, it is know as 'Non Nuclear'. The provinces of Buenos Aires, Chubut, Formosa, La Pampa, Santa Cruz and Tierra del Fuego, have in their respective Constitutions non nuclear articles, while the provinces of Catamarca, Cordoba, Corrientes, Chaco, Entre Rios, Formosa, Rio Negro, San Luis, Santa Cruz, Santa Fe, Tierra del Fuego and Tucuman have sanctioned in their respective jurisdictions non nuclear laws. New projects of these laws are in consideration and treatment in the provinces of Catamarca, La Pampa, Mendoza, Santiago del Estero and Rio Negro. The present work compiles and analyzes the available information on this subject. Although the topic is not regulatory, it could have involved in the regulatory area in an eventual situation that could be presented between regulatory laws of federal and provincials reaches. This work describes the current situation and the probabilities consequences of the mentioned legislation. (author)

  13. ADN antiguo; restos esqueletales precolombinos

    Directory of Open Access Journals (Sweden)

    Dejean, Cristina Beatriz

    2005-01-01

    Full Text Available El objetivo de este estudio consistió en: 1 determinar haplogrupos de ADNmt en restos esqueletales precolombinos de Pampa Grande, Prov. de Salta, Argentina, y 2 comparar los resultados obtenidos respecto de los registrados en poblaciones nativas extintas y actuales de la Argentina. A partir de muestras de hueso compacto de 21 individuos se logró, en 16 de ellos (76%, extraer, amplificar y secuenciar la región hipervariable I del ADNmt. Se observaron 17 sitios polimórficos y los porcentajes de los haplogrupos fueron los siguientes: A=6%, B=50%, C=0% y D =44%. Las elevadas frecuencias de los haplogrupos B y D son concordantes con las detectadas en poblaciones aborígenes actuales de la Argentina (B=38%, D=32%. El dendrograma obtenido revela que Pampa Grande se une al conjunto de las poblaciones del Chaco (Chorote, Toba, Chulupi y a los mapuche de origen andino y se separa de los grupos extintos de Tierra del Fuego, probablemente, por la ausencia en estos de los haplogrupos A y B. Se discuten posibles causas determinantes de las relaciones y afinidades biológicas observadas.

  14. Well-differentiated fetal adenocarcinoma: A very uncommon malignant lung tumor

    Directory of Open Access Journals (Sweden)

    H. El Ouazzani

    2012-01-01

    Full Text Available Well-differentiated fetal adenocarcinoma (WDFA is a very uncommon malignant tumor originating in the lung. This report describes the case of a 38-year-old woman with a WDFA treated by surgery. The malignancy is low grade and associated with a good prognosis, and so it is important for clinicians to be aware of and to identify this rare variant of adenocarcinoma. Resumo: O adenocarcinoma fetal bem diferenciado (WDFA, de acordo com a sigla em inglês é um tumor maligno no pulmão muito invulgar que tem origem no pulmão. Este relatório descreve o caso de uma mulher de 38 anos com WDFA tratada através de cirurgia. A malignidade é de baixo grau e está associada a um bom prognóstico e, por isso, é importante que os clínicos estejam atentos e identifiquem esta variante rara de adenocarcinoma. Keywords: Well-differentiated fetal adenocarcinoma, Lung, Good prognosis, Palavras-chave: Adenocarcinoma fetal bem diferenciado, pulmão, bom prognóstico

  15. Competencia y diferenciación de productos en el mercado mexicano de tarjetas de crédito

    Directory of Open Access Journals (Sweden)

    Ernesto Estrada González

    2016-01-01

    Full Text Available Este artículo estudia la competencia en el mercado mexicano de tarjetas de crédito. Deriva funciones de demanda de un modelo de elección discreta, y de tasas de inte- rés de un modelo de competencia imperfecta, ambos con productos diferenciados. Estas funciones se estiman utilizando un panel de datos con 23 segmentos de límite de crédito y 18 bancos emisores entre junio del 2011 y junio del 2015. Los resulta- dos indican que hay competencia imperfecta con productos diferenciados y que las tarjetas son sustitutas más cercanas cuando pertenecen a segmentos similares. Asi- mismo, revelan que las tasas responden a costos, aunque también reflejan márgenes supracompetitivos. El análisis asocia el poder de mercado con la antigüedad de la cuenta, lo que muestra posibles asimetrías de información o costos de traspaso. En general, menores límites de crédito tienen mayores tasas de interés, pero también mayores costos y menores márgenes. Los resultados también permiten evaluar po- sibles efectos de concentraciones entre bancos emisores. Finalmente, se hacen algu- nas recomendaciones de política con base en esta evidencia.

  16. Vivências e Historicidades: tecendo o currículo na educação de jovens e adultos

    Directory of Open Access Journals (Sweden)

    Denise de Melo Sotelo

    2012-08-01

    Full Text Available O presente artigo pretende fazer uma análise histórica da Educação de Jovens e adultos, focando em seu contexto atual e considerando as especificidades dessa clientela, desde a heterogeneidade de faixa etária, diversidade cultural e motivação, bem como as suas necessidades em tempos de contemporaneidade. Faz também uma abordagem quanto à valorização das identidades, das vivências e histórias: de vida de cada indiv