In vivo measurement of fluoride effects on glucose homeostasis: an explanation for the decrease in intelligence quotient and insulin resistance induced by fluoride Lombarte, Mercedes; Fina, Brenda Lorena; Lupión, Patricia Melina; Lupo, Maela; Rigalli, Alfredo The fluoride ion (F) is a disturbing substance for the glucose-insulinsystem. The effects of F have been studied in various aspects. The chronic intake ofF generates hyperglycaemia with high plasma insulin levels. This effect is observedin several countries where the content of fluoride in drinking water is greater than theupper limit recommended by WHO (1.5 mg/L). The administration of a dose of Fcauses a decrease of insulin levels, which was attributed to a decrease in insulinsecretion through in vitro experiments. However, measurement of insulin secretionin vivo has not been done so far. Moreover, in endemic fluorosis areas children hadlower intelligence quotient (IQ) than children of areas with low F in drinking water.This decrease in IQ has also been observed in rats. In this work, the glucose uptakerate of insulin-independent tissues, insulin secretion, and insulin clearances weremeasured in vivo in rats that received a dose of F. A lower secretion and clearance ofinsulin were found in animals that received F. In addition, a decrease in glucoseuptake rate from insulin-independent tissues was observed. This glucose uptake ismainly the glucose consumed by the nervous system. As a consequence, thisdecrease could be associated with the effect of fluoride on IQ.

School Cluster policy in Portugal: elements of the sociology of organizations for the study of a new normative model of school organization; Política de Agrupamiento Escolar en Portugal: elementos de la sociología de las organizaciones para investigar un nuevo modelo normativo de organización escolar; Política de Agrupamento Escolar em Portugal: elementos da sociologia das organizações para investigar um novo modelo normativo de organização escolar Bocchio, María Cecilia This article presents results of a doctoral thesis framed in the Portuguese educational policy of School Clusters (SC). Since 2010, the SC represents a new regulatory model of school organization that brings together multiple schools, at all levels of compulsory education and located in geographic proximity. Specifically, this research approaches this policy enactment in an SC located in Lisbon. The theoretical and methodological approach of the study is based on the contributions that Erhard Friedberg developed within the framework of the sociology of organizations. The publication is divided in two sections. First, the article introduces the SC policy and research carried out for this article. Then, the second section addresses Friedberg’s core conceptual categories. His concept of Concrete Action System allows analyzing through which actors and how the action is organized in the fictitiously named SC Margin. It is intended to show the potential that the sociology of organizations has for research in education policy, particularly in the study of complex regulatory processes of educational policies that occur in educational institutions.; Este artículo recoge resultados de una tesis doctoral que se enmarca en la política educativa portuguesa de Agrupamiento Escolar (AE). Desde el año 2010 el AE constituye un nuevo modelo normativo de organización escolar que nuclea a múltiples escuelas, de todos los niveles de enseñanza obligatoria, localizadas en relativa proximidad geográfica. Concretamente, en la investigación desarrollada se aborda la “puesta en acto” o enactment de esta política en un AE localizado en Lisboa. El enfoque teórico-metodológico del estudio se basa en los aportes que Erhard Friedberg desarrolla en el marco de la sociología de las organizaciones. La publicación se estructura a partir de una introducción a la política de AE y a la investigación desarrollada. Seguidamente, se abordan algunas de las principales categorías conceptuales de Friedberg, cuyo concepto de Sistema de Acción Concreto posibilita analizar cómo, y a través de qué actores, se organiza la acción en el ficticiamente denominado AE Margen. Se pretende mostrar las potencialidades que la sociología de las organizaciones posee para la investigación en política educacional, concretamente para el estudio de los complejos procesos de regulación de las políticas que acontecen en las instituciones educativas.; Este artigo apresenta resultados de uma tese de doutoramento que se enquadra na política educativa portuguesa de Agrupamento Escolar (AE). Desde 2010 o AE representa um novo modelo normativo de organização escolar que reúne várias escolas de todos os níveis de escolaridade obrigatória, e têm relativa proximidade geográfica. Nesta pesquisa trabalha-se, específicamente, a atuação (enactment) desta política em um AE de Lisboa. A abordagem teórica e metodológica do estudo recolhe as contribuições que Erhard Friedberg desenvolve no âmbito da sociologia das organizações. Em primeiro lugar se introduz à política de AE e é descrita a investigação desenvolvida; em segundo lugar são apresentadas algumas das principais categorias conceituais de Friedberg, cujo conceito de Sistema de Acção Concreta permite analisar como e através de quais atores a ação é organizada no, ficticiamente nomeado, AE Margem. O objetivo do presente trabalho é analisar o potencial da sociologia das organizações para a investigação em política educacional, particularmente para o estudo dos complexos processos regulatórios das políticas que acontecem em instituições de ensino.

Evaluation of chlorpyrifos tolerance and degradation by no-toxigenic Aspergillus section Flavi strains isolated from agricultural soils Carranza, Cecilia Soledad; Aluffi, Melisa Egle; Barberis, Carla Lorena; Magnoli, Carina Elizabeth This study was conducted to evaluate the in vitro tolerance, utilization and degradation of chlorpyrifos by no-toxigenic Aspergillus section Flavi strains natives of agricultural soils. The tolerance assay showed that all strains were able to grow at the highest insecticide concentration (700 mg L-1). In media supplied with chlorpyrifos, the highest values of growth rate were observed in the full Czapek Dox medium (CZ) (7.2 to 8 mm day-1) and the lowest values were registered in the medium where the insecticide replaced the carbon source (CZC) (3.6 to 4.4 mm day-1). In media where the insecticide replaced the nitrogen (CZN) and phosphorous (CZP) source, the values of growth rate were significantly higher than in CZC and lower than in CZ. Degradation assays showed that the degradation percentage was 75% at 0.98 and 0.95 of water activity, in all concentrations (1753, 3506 and 7012 mg L-1). A fast decrease of chlorpyrifos was observed within the first day of incubation, and then the biodegradation rate decreased over time. This study provides evidence on the effective growth ability and degradation of no-toxigenic Aspergillus section Flavi in presence of high chlorpyrifos concentrations and under optimal growth conditions (aW and temperature).

Effect of Water Stress during the Spike Growth Period on Wheat Yield in Contrasting Weather Cantarero, Marcelo Gabriel; Abbate, Pablo Eduardo; Balzarini, Monica Graciela The effect of water deficit on spring wheat yield (Triticum aestivum L.) was analyzed focusing on crop growth and dry weight partitioning during the spike growth period (SGP). Two levels of water availability (rainfed and irrigated) were tested in two locations (Córdoba and Balcarce, Argentina). The degree of source limitation for grain filling was greater under rainfed conditions (12%) than under irrigation (5%); however, water stress affected yield by 40% (mean of all experiments), mainly through grain number m-2 (GN) rather than by differences in weight per grain. The decrease in GN due to water stress was associated with spikes dry weight (SDW = total spikes weight ? grain weight) measured 7 days after anthesis, but some additional experiment effect was detected on GN. Analysis of different weather variables showed the vapor pressure deficit (VPDX) as the one that best explained GN deviations. A model for GN estimation with or without water stress, was developed including the effect of water stress on SDW reduction ( ΔSDW ), where H represents no waterstress:GN  4878  51 SDWH  max  10  91 VPDX, 51  ΔSDW (R =0.93).The SDW was analyzed as the product between spike growth rate (SGR) and the spike growth period (SGP) duration. SGP duration was not affected by water level, but anthesis date was up to 9 days earlier under water stress in Córdoba. SGR was more associated with crop growth rate (CGR) than with assimilates partition to spikes, and this effect increased when CGR was reduced. CGR was associated with the amount of intercepted photosynthetic active radiation during the SGP but not with the radiation use efficiency. Thus, GN was affected for both water stress reducing the availability of assimilates for spike growth and VPDX of each environment.

Relaciones entre el conocimiento conceptual y el procedimental en el aprendizaje de las fracciones; Relationships between conceptual and procedural knowledge in fractions learning Andrés, María Laura; Canet Juric, Lorena; Introzzi, Isabel Maria; Stelzer, Florencia; Urquijo, Sebastian El objetivo de este trabajo fue analizar las relaciones entre el conocimiento conceptual y el procedimental de las fracciones durante su aprendizaje. Para esto se efectuó una búsqueda bibliográfica en las bases de datos ERIC, PsycInfo, Scielo y Redalyc, con los siguientes términos en español y sus equivalentes en inglés: fracciones (fractions), conocimiento conceptual (conceptual knowledge), conocimiento procedimental (procedural knowledge) y niños (children), combinados de diferente forma con el operador booleano AND (Y). Los resultados de esta búsqueda permitieron hallar quince artículos empíricos que pueden clasificarse en cuatro grupos de investigaciones: las que indican una relación bidireccional, las que sugieren una relación unidireccional, las que muestran cierta independencia o restricciones en su vinculación y, por último, las que señalan que las relaciones varían según los sujetos. Esta falta de acuerdo podría explicarse por ciertas diferencias metodológicas de los estudios, por ejemplo, diferencias en el grado de consolidación del conocimiento de las fracciones de los participantes, el sentido conceptual o la habilidad procedimental estudiada, el tipo de enseñanza matemática recibida, etc. Por ello se sugiere que, para profundizar la comprensión de las relaciones entre el conocimiento conceptual y procedimental de las fracciones, estos aspectos metodológicos deben ser controlados.; The aim of this study was to analyze the relationship between conceptual knowledge and procedural knowledge of fractions during learning. For this propose, a literature search was conducted in the databases of ERIC, PsycINFO, Scielo and Redalyc, using the following terms in English and their equivalent word in Spanish: Fractions (fracciones), conceptual knowledge (conocimiento conceptual), procedural knowledge (conocimiento procedimental) and children (niños). The terms were combined in different ways using the Boolean operator AND. The results of this search produced fifteen empirical articles that can be classified into four research groups: those that indicate a bidirectional relationship, those that suggest unidirectional relationship, those that showed some independence or restrictions on their relationship and those stating that relationships vary according to subjects. This lack of agreement could be explained by some methodological differences among studies, for example, differences in the consolidation degree of fraction knowledge of the participants, the conceptual sense or procedural ability studied, the type of mathematical education received, etc. Therefore, so as to deepen the understanding of the relationship between conceptual and procedural knowledge of fractions, we suggest that such methodological aspects should be controlled.

La representación violenta de reivindicaciones territoriales y acciones colectivas: claves para el análisis de los discursos del pueblo mapuche y de la prensa nacional (1995-2015); Violent representations of territorial claims and collective actions: Keys to analyzing the speech ofthemapuche people and national media (1995-2015) Aguirre, Carla Sabrina Este trabajo se propone analizar posibles orígenes de un discurso, dentro de la sociedad hegemónica en el plano nacional, y del campo mapuche en el plano provincial, que vincula las reivindicaciones territoriales mapuche a una representación violenta de las acciones colectivas. Esto permite interrogarnos acerca de los términos en los cuales se dan las “batallas culturales” ligadas a las reivindicaciones territoriales. Así, mientras los discursos en disputa dentro del campo mapuche se trenzan en una batalla por la legitimidad de métodos y las estrategias de acciones colectivas, el discurso elaborado por el diario nacional seleccionado (La Nación) se puede a su vez dividir en tipologías específicas que se solapan en el tiempo.; This paper intends to analyze possible origins of a speech that links territorial mapuche claims to violent collective actions, in hegemonic society in a national level (national newspaper), and the mapuche political field, in a provincial level. This allows us to ask ourselves about the terms in which “cultural battles”, related to territorial claims, are given. While unmatching speeches inside the mapuche political field battle for the legitimation of methods and strategies for collective actions, the speech of the chosen national newspaper (La Nación) can, itself, be divided into three specific types of speech, that coexist in time.

La Psicopedagogía en el ámbito escolar. ¿Qué y cómo representan los docentes la intervención psicopedagógica?; Psychopedagogy at schools: how do the teachers represent the psychopedagogy intervention? Messi, Lucila; Rossi, Beatriz; Ventura, Ana Clara Este trabajo explora las representaciones docentes sobre la intervención psicopedagógica en ambientes educativos. Se diseñó un estudio descriptivo basado en encuestas elaboradas ad hoc. Participaron 65 docentes de cinco escuelas públicas primarias y secundarias argentinas que contaban con servicio de psicopedagogía con una antigüedad de, al menos, tres años. Los resultados mostraron que los docentes representaron la intervención psicopedagógica como la reeducación de dificultades de aprender de los alumnos, sustentada frecuentemente mediante mecanismos terapéutico/clínicos individuales y adaptaciones curriculares. Si bien la complementación entre docentes y psicopedagogos/as pareció ser escasa, es el punto sobre el que más expectativas manifestaron los docentes. Se discute la necesidad de impulsar un modelo de intervención que habilite al psicopedagogo/a a trabajar con la institución educativa en su conjunto.

El maná de una particular energía. El panorama de las instalaciones hipersaturadas de Diego Bianchi y Leopoldo Estol a mediados del dos mil Baeza, Federico Aníbal Mariano Diego Bianchi y Leopoldo Estol, luego de conocerse en la beca Kuitca, trabajaron juntos una sola vez, el resultado fue la instalación Escuelita Thomas Hirschhorn en 2005. En la galería Belleza y Felicidad montaron una gruta tapizada con la característica cinta marrón de embalar –la reconocida marca del artista suizo– dando forma a una serie de claustrofóbicos ambientes interconectados por desiguales funciones: kiosco, ciber-locutorio, disco, aula, mirador y jardín. Este espacio multiforme albergó fiestas, clases, charlas, entre otros encuentros que discurrieron en los calurosos últimos días del año.

Molecular gas in the star-forming region IRAS 08589-7414 Saldaño, Hugo Pablo; Vasquez, Javier; Cappa, Cristina Elisabeth; Gomez, Mercedes Nieves; Duronea, Nicolas Urbano; Rubio, M. Aims. We present an analysis of the region IRAS 08589−4714 with the aim of characterizing the molecular environment. Methods. We observed the 12CO(3 −2), 13CO(3 −2), C18O(3 −2), HCO+(3 −2), and HCN(3 −2) molecular lines in a region of 150′′× 150′′, centered on the IRAS source, to analyze the distribution and characteristics of the molecular gas linked to the IRAS source. Results. The molecular gas distribution reveals a molecular clump that is coincident with IRAS 08589−4714 and with a dust clump detected at 1.2 mm. The molecular clump is 0.45 pc in radius and its mass and H2 volume density are 310 M⊙ and 1.2 × 104 cm-3, respectively. Two overdensities were identified within the clump in HCN(3−2) and HCO+(3−2) lines. A comparison of the LTE and virial masses suggests that the clump is collapsing in regions that harbor young stellar objects. An analysis of the molecular lines suggests that they are driving molecular outflows.

Interdependencia económica mundial y procesos de resistencia campesina en un mundo globalizado: La experiencia de la Vía Campesina internacional Pinto, Lucas Henrique En el artículo analizaremos la globalización de la economía mundial y las formasde resistencia campesina generadas desde mediados de los años de 1990,problematizando así la emergencia de conflictos sociales desencadenados porlos procesos de globalización, y la novedad en el ámbito de la acción colectivarural que fue la creación de una organización internacional de campesinos.Analizaremos a La Vía Campesina (LVC), movimiento mundial que pretende nuclearpequeños productores rurales frente al accionar de instituciones como laOrganización Mundial del Comercio en la producción mundial de alimentos. Elobjetivo del trabajo es ver de manera breve cómo la globalización afecta las formasde vida campesinas en el mundo; cómo esos campesinos procuran resistira este proceso organizándose a escala mundial e internacionalizando su lucha.Para ello, examinaremos cómo se da el nacimiento de la organización a partirde documentos, entrevistas y sus cuestionamientos al proceso de globalizacióncapitalista-neoliberal.; In the article discuss the globalization of the world economy and forms of peasant resistance generated since mid-1990 years, problems thus the emergence of social conflicts triggered by globalization processes, and novelty in the field of rural collective action which was the creation of an international organization of peasants. We will analyze at La Via Campesina. (LVC), global movement seeking nuclear small farmers against the actions of institutions such as the World Trade Organization on world food production. The objective of the study is to see briefly how globalization affects rural ways of life in the world; how those farmers seek to resist this process organizing themselves on a global scale and internationalize their struggle. Therefore we will examine how the birth of the organization from documents, interviews and their questions is given to the neoliberal capitalist globalization process.

Trazas de una cultura institucional policial a través de la historia de la Sociedad de Socorros Mutuos de la Policía de la Provincia de Buenos Aires en el siglo XX; Traces of a Police Institutional Culture through the History of the Sociedad de Socorros Mutuos of the Buenos Aires Province Police during the XX Century Barreneche, Osvaldo Este artículo se centra en la historia de la Sociedad de Socorros Mutuos de la Policía de la provincia de Buenos Aires, en especial, durante la primera mitad del siglo XX, señalando que fue en el temprano marco de dicha organización mutualista, siempre vinculada a las jefaturas de policía, donde se gestaron algunos de los fundamentos y prácticas que ayudaron a cimentar un obrar institucional de larga perdurabilidad en el tiempo. El vínculo de semi-autonomía generado entre la Sociedad, la conducción policial y el estado bonaerense, sirvió también de modelo de otras asociaciones integradas por policías y que tendrían su nacimiento y creciente influencia durante la segunda mitad del siglo XX. Precisamente a partir de mediados de dicho siglo comenzó el declinar de la Sociedad, como entidad representativa de los policías, por lo que al final del trabajo se formulan algunas hipótesis de las razones por las cuales esto puede haber ocurrido y el legado de la Sociedad en términos de la consolidación de una cultura institucional policial.; This article deals with the history of the Mutual Aid, Friendly Society of the Buenos Aires Province Police, especially during the first half of the XX Century. The piece argues that it was in the early context of this mutual aid association, always tied to the mentioned Police Agency, where some ideas of how to conduct police business took place. The bond among the Society, the Police Agency, and the Provincial State Government served as influential model for other police associations which were born later on during the second part of the same Century. Precisely from the middle of the Century on the Society began to slowly fade away as a highly representative police association. However, the Society´s symbolic influence never disappeared and in this paper we would formulate some hypothesis about that endurance as well as its connections with the consolidation of a police institutional culture.

Uso de atmósfera controlada y 1-MCP en kiwis ´Hayward´ producidos en Argentina: efectos sobre la maduración Yommi, Alejandra Karina; Baeza, María Cecilia; Casanovas, Elda Mabel; Quillehauquy, Victoria; Borrajo, María Paula; Fasciglione, Gabriela Se estudió el efecto del uso de la atmósfera controlada (AC), 1-metilciclopropeno (1-MCP) y su combinación, sobre la maduración del kiwi ‘Hayward’. Frutos cosechados con 16,6% de materia seca y 9% de sólidos solubles totales (SST) fueron enfriados y tratados con 1000 ppb de 1-MCP (SmartFresh) durante 24h o permanecieron sin tratar con 1-MCP (controles). Posteriormente, frutas controles y tratadas con 1-MCP fueron almacenadas en cámara de frío convencional (FC, 0 °C y 90% HR) o en cámara de atmósfera controlada (AC, 2% O2 y 5% CO2, 0 °C; 90% HR) durante 5 meses (5m). Al finalizar, muestras de todas las combinaciones de tratamiento permanecieron durante un mes adicional en FC (5m + 1m). A la cosecha, a los 5m y 5m + 1m y después de la poscámara (7 días a 20 °C) se midieron el índice de color (en base a L*, a*, b* de CIE) y la firmeza de la pulpa (N), el SST (%) y la acidez titulable (AT, %). También se evaluó la dureza de columela al final de la poscámara, mediante análisis sensorial. Los tratamientos afectaron fundamentalmente la firmeza de la pulpa y de la columela. Los frutos almacenados en AC resultaron significativamente más firmes que los almacenados en FC, tanto a los 5m como a los 5m + 1m, evidenciando el efecto residual de dicha tecnología. Igual resultado se encontró para dureza de columela. El uso de 1-MCP en combinación con la AC también mostró un efecto sinérgico sobre la firmeza a los 5m + 1m, permitiendo prolongar el período de almacenamiento de los frutos.; The effect of the use of controlled atmosphere (CA), 1-methylcyclopropene (1-MCP) and their combination on the ripening of ‘Hayward’ kiwifruits was studied. Fruits harvested with 16.6% dry matter and 9% of total soluble solids (TSS) were cooled and treated with 1000 ppb of 1-MCP (SmartFresh) for 24 hours or remained untreated (controls). Untreated and 1-MCP-treated fruits were kept at cold storage (CS, 0 °C and 90% RH) or at controlled atmosphere storage (CA, 2% O2 and 5% CO2, 0 °C and 90% RH) for 5 months (5m). Subsequently, samples from all treatment combinations remained for an additional month at CS (5m + 1m). At harvest, 5m and 5m+1m and shelf-life (7 days at 20 °C), color index (based on L*, a*, b* of CIE) and flesh firmness (N), TSS (%) and titratable acidity (TA, %) were measured. Hard core was also evaluated by sensory analysis at shelf-life. Treatments mainly affected the flesh firmness and hard core. Fruits stored in CA were significantly firmer than those stored in CS, both at 5m and 5m+1m, showing the residual effect of this technology. The same result was found for hard core. The use of 1-MCP in combination with CA also showed a synergistic effect on flesh firmness at 5m + 1m, prolonging the storage period of the fruits.

Peronismo para la Liberación Nacional ¿y social? El vínculo peronismo-revolución en las revistas Militancia Peronista para la Liberación y Envido, 1973 Stavale, Mariela El siguiente artículo se desprende de una investigación en curso y se centra en el análisis comparado de dos revistas político-culturales expresivas del peronismo revolucionario: Militancia Peronista para la Liberación y Envido. Ambas estuvieron atravesadas por las discusiones entre “movimientistas y alternativistas” dentro de la izquierda peronista y este artículo propone un análisis situado de ese debate, a partir de la comparación de dos experiencias coetáneas que expresaron ambas posiciones. Intentando arrojar luz sobre este proceso, se busca reponer las formas en que las revistas articularon los conceptos de «peronismo» y «revolución» en la compleja coyuntura del tercer peronismo, prestando especial atención a la forma en que ambas significaron la experiencia del gobierno y la identidad peronista revolucionaria.; The following article is clear from research in progress and focuses on the comparative analysis of two expressive politico-cultural magazines of the revolutionary peronism: Militant Peronist for the Liberation and Envido. Both were by discussions between “movimientistas and alternativistas” within the Peronist Left and here is a located analysis of this discussion from the comparison of two contemporary experiences that expressed both positions. Trying to shed light on this process, seeks to replace the forms in which the magazines articulated the concepts of “Peronism” and «revolution» in the complex situation of third peronism, paying special attention to the way in which both meant the experience of the Government and the revolutionary peronist identity.

La nación, la escuela y “los otros”: reflexiones sobre la historia de la educación en Argentina y Colombia en el imaginario civilizatorio moderno; The nation, the school and “the others”: Thoughts about the history of education in Argentina and Colombia in the modern civilizational imaginary; A nação, a escola e “os outros”: Reflexões sobre a história da educação na Argentina e na Colômbia no imaginário civilizatório moderno Ocoró Loango, Anny El presente artículo dirige la mirada hacia la historia de la educación en dos países latinoamericanos: Argentina y Colombia para decodificar cómo, desde sus orígenes como nación, la intención de afianzar la nacionalidad y la ciudadanía se usó para la exclusión, la invisibilización o la integración subordinada de las poblaciones y culturas que no eran consideradas parte constitutiva de la nación. También señala las limitaciones que han tenido los análisis desde el campo de la historia de la educación en América Latina para dar cuenta y problematizar lo suficiente el correlato racista y excluyente hacia los pueblos indígenas y las comunidades negras y afrodescendientes. Finalmente ofrece una lectura sobre las líneas de investigación y aportes que diferentes autores viene haciendo para analizar esta problemática desde los textos escolares.; This paper focuses on the history of education in two Latin American countries, Argentina and Colombia, aiming to decipher how, from their very origins as nations, the intention to strengthen nationality and citizenship was used to exclude, erase or subordinate the integration of populations and cultures that were not considered part of the nation. It also points out the limitations to the analysis from the history of education in Latin America to account for and sufficiently problematize the racist and exclusionary correlative with indigenous people and the black and African descendant communities. Finally, the paper offers a reading on the lines of research and contributions of different authors to analyze this problem based on the textbooks.; O presente artigo centra-se na história da educação em dois países latino-americanos: a Argentina e a Colômbia, para decodificar como, desde suas origens como nação, a intenção de consolidar a nacionalidade e a cidadania foi utilizada para a exclusão, a invisibilização ou a integração subordinada das populações e culturas que não eram consideradas parte da nação. Além disso, são assinaladas as limitações nas análises desde o campo da história da educação na América Latina, para dar conta e problematizar o discurso racista e excludente com os povos indígenas e as comunidades negras e afrodescendentes. Finalmente, oferece-se uma leitura sobre as linhas de pesquisa e contribuições que diversos autores fizeram para analisar esta problemática desde os textos escolares.

Random amplified polymorphic DNA PCR in the teaching of molecular epidemiology Reinoso, Elina Beatríz; Bettera, Susana Gertrudis In this article, we describe a basic practical laboratory designed for fifth-year undergraduate students of Microbiology as part of the Epidemiology course. This practice provides the students with the tools for molecular epidemiological analysis of pathogenic microorganisms using a rapid and simple PCR technique. The aim of this work was to assay RAPD-PCR technique in order to infer possible epidemiological relationships. The activity gives students an appreciation of the value of applying a simple molecular biological method as RAPD-PCR to a discipline-specific question. It comprises a three-session laboratory module to genetically assay DNAs from strains isolated from a food outbreak.

Gamow states as solutions of a modified Lippmann-Schwinger equation Civitarese, Enrique Osvaldo; Gadella Urquiza, Manuel In this paper, we discuss the structure of Gamow states as solutions of Lippmann-Schwinger equation. The Friedrichs model is used to demonstrate it, both analytically and by applying perturbation theory to the extended spectrum of the Hamiltonian. The method presented here may be relevant to the inclusion of resonances in discrete basis, without the need of numerical constructions to define Gamow states, as entities depending on the choice of integrals contours, or as states resulting from ad hoc discretizations of the continuum.

Draft Genome Sequence of Photorhabdus luminescens Strain DSPV002N Isolated from Santa Fe, Argentina Palma, Leopoldo; del Valle, Eleodoro Eduardo; Frizzo, Laureano Sebastian; Berry, Colin; Caballero, Primitivo Here, we report the draft genome sequence of Photorhabdus luminescens strain DSPV002N, which consists of 177 contig sequences accounting for 5,518,143 bp, with a GC content of 42.3% and 4,701 predicted protein-coding genes (CDSs). From these, 27 CDSs exhibited significant similarity with insecticidal toxin proteins from Photorhabdus luminescens subsp. laumondii TT01.

Las mujeres instruidas asumen el desafío de tomar la palabra: representaciones de la Independencia en el fin de siglo Vignoli, Marcela El presente trabajo explora las distintas formas que asumió la participación femenina en festejos patrios que desde la celebración evocaban la Independencia de las Provincias Unidas de Sudamérica. Su desempeño para estas fechas pautadas por la liturgia patriótica como oradoras o escritoras de pequeños ensayos en las revistas literarias, así como desde la pintura y la música constituyen instantes visibles de un complejo proceso a través del cual se modificarían ciertos patrones de sociabilidad de índole cultural en Tucumán.

Germination response of Salsola schweinfurthii (Chenopodiaceae) to salinity and winged perianth removal Bhatt, A.; Pérez García, F.; Carón, María Mercedes; Gallacher, D. Salsola schweinfurthii is a perennial branched halophytic shrub that inhabits arid environments in and around the Arabian Peninsula. Its tolerance to extreme drought renders it suitable for urban arid landscaping. Germinability of intact and de-winged seeds (winged perianth removed) was determined under two photoperiods (0 and 12 hours light per day), three thermoperiods (daily low/high of 15/25, 20/30 and 25/35°C) and five salinity levels (0, 100, 200, 400 and 600 mM NaCl). Germination was maximised (93%) by de-winging and incubation in 12 hours light at 25/35°C. Intact and de-winged seeds both exhibited positive photoblastism. Germination of intact seeds was entirely prevented by the lowest level of salinity, and only slightly less prevented in de-winged seeds. Ability to germinate returned after saline solution was replaced with distilled water. The ability for S. schweinfurthii seeds to remain viable through a temporary period of salinity indicates an adaptation to unpredictable soil surface conditions in arid environments. Artificial propagation rates might be increased by removing perianths and sowing before or after mid-winter.

The herbicide glyphosate is a weak inhibitor of acetylcholinesterase in rats Larsen, Karen Elizabeth; Lifschitz, Adrian Luis; Lanusse, Carlos Edmundo; Virkel, Guillermo Leon The current work evaluated the inhibitory potency of the herbicide glyphosate (GLP) on acetylcholinesterase (AChE) activity in male and female rat tissues. The AChE activity in brain was higher (p < 0.05) than those observed in kidney (females: 2.2-fold; males: 1.9-fold), liver (females: 6-fold; males: 6.9-fold) and plasma (females: 14.7-fold; males: 25.3-fold). Enzyme activities were higher in presence of 10 mM GLP compared to those measured at an equimolar concentration of the potent AChE inhibitor dichlorvos (DDVP). Moreover, IC50s for GLP resulted between 6 × 104- and 6.8 × 105-fold higher than those observed for DDVP. In conclusion, GLP is a weak inhibitor of AChE in rats.