83 research outputs found
The toxic effects of the pesticide lindane on the early developmental stages of the fathead minnow
No full textToxic effects of the pesticide Lindane on the eggs, yolksac fry and larvae of the fathead minnow (Pimephales promelas) were investigated over 14 days at 25 and 18°C. The general objective was to understand the effects of the pesticide on the early life stages of the fish, and to evaluate the suitability of these stages as indicators of contaminated environments.
Egg, yolk-sac and larval stages that had been exposed to 300, 120, 90, 60, 30, 10, 5, and 0 μg/L of Lindane at 25°C exhibited a 14d-LC₅₀ of 44 μg/L. Similarly, the same stages exposed to 300, 120, 90, 60, 30, 10, and 0 μg/L of Lindane at 18°C exhibited a 14d-LC₅₀ of 37 μg/L. Lower temperature thus seemed to increase the susceptibility of the fish to the pesticide.
Mortality data were also used to determine the sensitivity of the early developmental stages of fish to the pesticide. At 25°C, the larval stage was the most sensitive stage. At 18°C, on the other hand, the most sensitive stage was the yolk-sac. Results obtained from experiments in which Lindane doses were applied at different intervals within the 14d-period supported these observations.
Low temperatures had a marked effect on the sensitivity of the fathead minnow to Lindane. Embryos exposed to Lindane at 18°C showed different temporal distribution of mortality than those at 25°C. A delay in hatching and emergence of smaller larvae were also noted at 18°C.
Lordoscoliosis, edemas and hemorrhages were the most common morphological changes induced by the pesticide during the larval stage. The frequency of these abnormalities was linearly related to doses of Lindane. Impaired swimming behavior was also noted, but it was not related to dosages.Master of Scienc
La verdadera noche de Iguala, el muro de Trump y las drogas: Entrevista con la periodista Anabel Hernández
No full textAnabel Hernández is one of the most recognized Mexican journalists in the world. She is the author, among others, of the narrative and investigative journalism books entitled: Mexico in flames: Calderon's legacy, The lords of the narco and The real night of Iguala: the story that the government tried to hide, the latter being the most complete and current investigation on the case of the 43 students of the Normal Rural de Ayotzinapa, who were disappeared in Iguala, Guerrero, on the night of September 26, 2014.Anabel Hernández es una de las periodistas mexicanas más reconocidas en el mundo. Es autora, entre otros, de los libros de periodismo narrativo y de investigación titulados: México en llamas: el legado de Calderón, Los señores del narco y La verdadera noche de Iguala: la historia que el gobierno trató de ocultar, siendo ésta la más completa y actual investigación sobre el caso de los 43 estudiantes de la Normal Rural de Ayotzinapa, quienes fueron desaparecidos en Iguala, Guerrero, la noche del 26 de septiembre de 2014
Natural resources innovation and development
No full textIn this Globelics Thematic Review, the author teampresents and discusses recent research on the relationshipsbetween natural resources1, innovationand development in developing countries, and suggestssome implications of this body of knowledgefor policy makers.Fil: Andersen, Allan Dahl. No especifíca;Fil: Johnson, Björn. Aalborg University; DinamarcaFil: Marin, Anabel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigaciones para la Transformación; ArgentinaFil: Kaplan, Dave. No especifíca;Fil: Stubrin, Lilia Inés. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Centro de Investigaciones para la Transformación; Argentina. Universidad Nacional de San Martin. Escuela de Economía y Negocios; ArgentinaFil: Lundvall, Bengt Åke. Aalborg University; DinamarcaFil: Kaplinsky, Raphael. No especifíca
Poetic-experimental Configurations of Theatrical Production in the Central and Coastal regions of Argentina
No full textEl presente trabajo propone elaborar una estructura de análisis para el estudio comparado sobre teatralidades que abordan la experimentación teatral en las regiones Centro y Centro litoral. Se estudian los casos de la producción dramatúrgica de Mar del Plata y El Séptimo Fuego; y el caso de la producción teatral de Paraná y el grupo Teatro del Bardo, respectivamente. El objeto de este estudio interregional es analizar la lógica de experimentación teatral y las nociones de productividad centro-periferia que configuran la historiografía del teatro nacional. Esta investigación se sustenta en la perspectiva del teatro comparado y de la nueva dramaturgia argentina porque permiten visibilizar otros mapeos posibles sobre el territorio, atendiendo a la dinámica de producción escénico regional, e identificar en ellos un nodo poético regional de experimentación teatral entre la región Centro y Centro litoral.The author proposes an analysis structure for the comparative study of experimental theatricalities in Argentina’s Central and Coastal regions. The cases of the dramaturgical production of Mar del Plata with El Séptimo Fuego and the case of the theatrical production of Paraná and the Teatro del Bardo groups are studied. This interregional study aims to analyze the logic of theatrical experimentation and the notions of center-periphery productivity that make up the historiography of national theater. The comparative theater approach helps to map new Argentine dramaturgies, taking into account the dynamics of regional production, and identify in them a regional poetic node of theatrical experimentation.Fil: Paoletta, Anabel Edith. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Arte; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentin
Pensar organizaciones desde la comunicación: Corrientes, conceptos clave y reflexiones metodológicas sobre el caso de los Consejos Locales de Niñez de la provincia de Buenos Aires
No full textThis work is included within the first systematizations and data analysis of the doctoral thesis, in which the communicational strategies of the Local Councils for Childhood and Adolescence in Buenos Aires Province have been examined, since their creation (2008-2009) to the present day (2019). This article gives an account of the importance of the research into Communicational Planning and, specifically of the studies in strategic communication to consider the organizations, their institutionality and their incidence in public policies.
Methodologically speaking, there is an exemplification of the initial use of two of the steps of the “enactive” approach, which is proposed by the Rosario School of Strategic Communication (Massoni, 2017): the Technical Communicational Version and the Characterization of the socio cultural matrixes of the actors.
Although the choice of the corpus has been restricted to General Pueyrredón, Moron and La Matanza Local Councils for Childhood, the author is a member of La Plata Local Council and of the recent Local Council Network in Buenos Aires Province, which explains why there is a view that has been influenced by that knowledge and those experiences.Este trabajo forma parte de las primeras sistematizaciones y análisis de datos de la tesis doctoral de Anabel Urdaniz, en la que se indagan las estrategias comunicacionales de los Consejos Locales de Niñez y Adolescencia de la provincia de Buenos Aires desde su creación (2008-2009) hasta la actualidad (2019). Este artículo describe y da cuenta del posicionamiento epistemológico de los estudios sobre planificación comunicacional y específicamente de los estudios de comunicación estratégica para pensar las organizaciones, su institucionalidad y su incidencia en políticas públicas.
A nivel metodológico, se ejemplifica el empleo inicial de dos de los pasos de la investigación enactiva que propone la Escuela de Comunicación Estratégica de Rosario (Massoni, 2017): la versión técnica comunicacional y la caracterización de las matrices socioculturales de los actores.
Si bien la elección del corpus se limita a los Consejos Locales de Niñez de General Pueyrredón, Morón y La Matanza, la autora forma parte del Consejo Local de La Plata y de la reciente Red de Consejos Locales de la provincia de Buenos Aires, por lo que su mirada está atravesada también por esos saberes y experiencias
Las organizaciones de la sociedad civil en el mundo de hoy : humanizando el desarrollo
No full textResumen: este capítulo explora la contribución de la sociedad civil al desarrollo humano. comienza con una revisión del enfoque de las capacidades y resalta que la afiliación es una de las capacidades humanas básicas identificadas por martha nussbaum. en ese sentido, se argumenta que la sociedad civil es esencialmente el escenario donde las personas se unen para ejercer su capacidad de afiliación. luego, se describe cómo la red mundial de organizaciones, civicus, concibe la sociedad civil y la metodología que utiliza para medir el Índice de la sociedad civil (isc). según civicus, la sociedad civil es “la arena o escenario, fuera de la familia, el estado y el mercado, que se construye mediante acciones individuales y colectivas, y por organizaciones e instituciones, para hacer avanzar intereses comunes”. el isc se mide en cuatro dimensiones fundamentales (compromiso cívico, nivel de organización, práctica de valores e impacto percibido), que luego se analizan en el contexto de una quinta dimensión: las condiciones externas. Finalmente, se identifican algunos indicadores concretos recogidos en el proceso de medición del Índice de la sociedad civil que representan un aporte a la cuantificación de la capacidad de afiliación. los mismos son: el voluntariado, las redes sociales, la densidad asociativa y los valores (transparencia, rendición de cuentas y responsabilidad).Fil: Cruz, Anabel. CIVICUS, Alianza para la participación ciudadanaAbstract: this chapter explores how civil society contributes to human development. it begins with a review of the capabilities approach and therein notes that affiliation is one of the basic human capabilities identified by martha nussbaum. in that sense, it is argued that civil society is essentially the space in which people come together to exercise the capability of affiliation. the chapter then describes civicus’s notion of civil society and methodology for measuring the civil society index (csi). according to civicus, civil society is “the arena or space outside of the family, the state and the market, that is constructed through individual and collective actions, and through organizations and institutions, in order to advance common interests.” the csi is measured in four fundamental dimensions (civic engagement, level of organization, practice of values and perception of impact), which are then analyzed in the context of a fifth dimension, external conditions. Finally, the author identifies several specific indicators gathered in the process of measuring the csi that can be useful for measuring affiliation, notably volunteerism, social networks, associative density and values (transparency, accountability and responsibility)
. 38 Año 12 (2015) diciembre. Señales de humo
No full text- Editorial por José Luis Perea González. - IV Coloquio Internacional. - "Construyendo nuestro futuri común: por una gestíon ética del Patrimonio cultural inmaterial" álamos, Sonora 1 a 3 de septiembre, 2015 por Edaly Guisell Quiroz Moreno. - Talleres itinerantes del Museo de Sonora por Jesús Carrillo Doráme. - Trabajo conjunto CONANP-Ayuntamineto de Álamos-INHA por Anabel Leyva Hernández. - El camino entre Álamos, Sonora y el fuerte, Sinaloa como Itinerario culrual primeros pasos por Esperanza Donjuan Espinoza y Martha Solís Zataraín. - X semana de história económica del Norte de México por Juan José Gracida Roma. - El viejo Hermosillo: crónicas sobre sus pobladores y las epidemias por Patricia Olga Hernández Espinoza. - Trabajos de difusión en la zona arqeuológica Cerro de Trincheras por SergioLópez Dávila
Enhanced mossy fiber sprouting and synapse formation in organotypic hippocampal cultures following transient domoic acid excitotoxicity
No full textWe have previously reported evidence of BDNF upregulation and increased neurogenesis in rat organotypic hippocampal slice cultures (OHSC) after a transient excitotoxic injury to the hippocampal CA1 area induced by low concentrations of the AMPA/kainate receptor agonist domoic acid (DOM). The changes observed in OHSC were consistent with observations in vivo, where low concentrations of DOM administered to rats during perinatal development caused increased BDNF and TrkB expression in the resulting adult animals. The in vivo low dose-DOM treatment also results in permanent alterations in hippocampal structure and function, including abnormal formation of dentate granule cell axons projecting to area CA3 (mossy fiber sprouting). Our objective in the current study is to determine if low concentrations of DOM induce mossy fiber sprouting and/or synaptogenesis in OHSC in order to facilitate future studies on the mechanisms of structural hippocampal plasticity induced by DOM. We report herein that application of a low concentration of DOM (2 μM) for 24 h followed by recovery induced a significant increase in the expression of the mossy fiber marker ZnT3 that progressed over time in culture. The DOM insult (2 μM, 24 h) also resulted in a significant upregulation of both the presynaptic marker synaptophysin and the postsynaptic marker PSD-95. All of the observed effects were fully antagonized by co-administration of the AMPA/kainate antagonists CNQX or NBQX but only partly by the NMDA antagonist CPP and not by the calcium channel blocker nifedipine. We conclude that exposure of OHSC to concentrations of DOM below those required to induce permanent neurotoxicity can induce a progressive change in hippocampal structure that can effectively model DOM effects in vivo
Domoic acid as a neurotoxin
No full textDomoic acid (DOM) is a naturally occurring excitatory amino acid with structural similarity, and similar but not identical pharmacological profile, to kainic acid. DOM is most commonly associated with toxic blooms of marine phytoplankton resulting in contamination of shellfish as well as other species. This brief chapter summarizes the known toxicological properties of DOM both in vitro and in vivo in a variety of model systems. The chapter also summarizes information on clinical cases of intoxication in both wildlife and humans and highlights the growing evidence that DOM is a potent neurodevelopmental toxin with relevance to both food safety issues and the etiology of neurological diseases
The design, production and verification of a fully elastic model of a catamaran for hydroelastic experiments
No full textCatamarans are popular in the offshore sector as they combine good transverse stability and ample deck space with low wave resistance. However, their slender hull shape results in low restoring qualities in heave and pitch motions. The large motions in rough weather can often result in water impacting the underside of the deck connecting the two hulls, a phenomenon called cross-deck slamming. The impulse excitation from cross-deck slamming can then produce a transient hydroelastic response of the structure called whipping. Whipping excites mode shapes that would not normally be present in the response, as their natural frequencies are significantly higher than the wave encounter frequency. This results in detrimental contributions to fatigue life through high-amplitude cyclical bending moments. Both the calculation of slamming loads and the prediction of resulting structural responses have been a challenge for several decades. The highly nonlinear and three-dimensional character of the phenomenon, combined with the strongly coupled fluid-structure interaction means that it is unpredictable, and even the definition of slamming events has been a matter of disagreement among researchers.\\Experiments are still a vital part of these investigations, for validating ever-improving numerical techniques. An essential issue with experiments is the extent to which mode shapes and natural frequencies can be emulated in model scale. Traditional hydroelastic models are segmented and use either a flexible backbone or flexible joints to introduce stiffness. This often results in an excellent description of the 2-node bending mode, but an increasing error for higher modes leads to stress inaccuracies. In this investigation, a fully elastic model of a catamaran is designed and produced for hydroelastic experiments. The advantages and limitations of the concept are identified, and the verification against structural models is presented.Marine Technology | Ship and Offshore StructuresMarine Technology | Ship Hydromechanic
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