Study of capillary network directionality and irrigation of hypoxic tissue in an angiogenesis lattice model Moglia, Belén; Guisoni, Nara Cristina; Albano, Ezequiel Vicente To shed light on the understanding of the angiogenesis process, we study a simplified lattice model for the capillary network formation between an existing blood vessel and an initially hypoxic tissue. We consider that the cells of the tissue surface can release growth factors that will diffuse, leading to the formation of new capillaries that ultimately arrive at the tissue. Additionally, we consider the local production of growth factors by the growing capillary network.We also propose the existence of an inhibition mechanism at the hypoxic surface, i.e., a fixed number of neighboring sites of an already irrigated site of the hypoxic tissue stop releasing growth factors due to the arrival of nutrients. Particularly, the goal of this work is to study the effect of the release of local growth factors and the inhibition mechanism on properties such as the directionality of the growing network and the irrigation of the hypoxic tissue. Therefore we propose the quantification of these two relevant features for angiogenesis modeling. We establish a relationship between the model behavior without the release of local growth factors in the presence of the inhibition mechanism and a normal angiogenesis process. In this situation, the model gives a directional capillary network and a good irrigation of the hypoxic tissue. On the other hand, for a large number of released local growth factors in the absence of the inhibition mechanism, the model could be appropriate for the description of tumor angiogenesis. In this case, the model provides a rather small directionality for the growing structure, with a worse degree of irrigation of the hypoxic tissue, as well as a more tortuous capillary network with many closed branches and loops.

Effect of low dimensionality and encapsulation on the magnetic and hyperfine properties of iron nanowires Weissmann, Mariana Dorotea; Errico, Leonardo Antonio Ab initio calculations were performed for a very thin iron nanowire, both free-standing and enclosed in a carbon nanotube with the same size and structure of available experiments. Our interest was to study the effects of low dimensionality and the influence of the Fe–C interaction on the magnetic and hypefine properties of these systems. Our main finding was that the interfacial region between the nanowire and the carbon nanotube is of fundamental importance, as an iron atom close to the carbon atoms has a magnetic moment and a local hyperfine field very different from that at the surface of a free-standing iron nanowire. In fact, the properties of the calculated iron nanowire, of only 1 nm in diameter, when encapsulated inside a carbon nanotube result close to those of bulk iron.

Lectinhistochemical staining of granuloma induced by bacillus Calmette-Guerin in Piaractus mesopotamicus; Lectinhistoquímica del granuloma inducido por el bacilo de Calmette Guérin en Piaractus mesopotamicus Manrique, Wilson G.; Claudiano, Gustavo S.; Figueiredo, Mayra A. P.; Petrillo, Thalita R.; Marcusso, Paulo F.; Gimeno, Eduardo Juan; Moraes, Julieta R. E.; Moraes, Flávio R. Objective: This study was conducted to evaluate, by means of lectinhistochemistry (LHC), the expression of carbohydrates in granulomas induced by the bacillus Calmette-Guerin (BCG) in muscle tissue of Piaractus mesopotamicus after 33 days. Material and methods: Histological sections with 3 µm thick were incubated with the following lectins: WGA (Wheat germ agglutinin), DBA (Dolichos biflorus agglutinin) and HPA (Helix pomatia agglutinin), and the results were evaluated by light microscopy. Results: Acid fast bacilli were stained by Ziehl Neelsen (ZN) and strong labeled by WGA in the cytoplasm of macrophages. Labeling with DBA was intense in fibroblasts and weak in macrophages. On the other hand, HPA binding was stronger in macrophages, especially in those that were in close contact with epithelioid cells, without evidence of binding to fibroblasts. The epithelioid cells were not labeled by the used lectins, but they were identified by Hematoxilin-Eosin (HE). The lectins labeled specific type saccharides in glycoproteins, as N-acetylglucosamine present in bacilli and macrophages, as well as N-acetyl-galactosamine in macrophages. The control group showed no inflammation or lectin binding. Conclusions. This technique may be useful in identifying receptors for WGA, DBA and the HPA lectins in epithelioid granuloma induced by BCG in P. mesopotamicus.; Objetivo: El presente estudio fue realizado para evaluar por medio de lectinhistoquímica (LHC), la expresión de carbohidratos en granulomas inducidos por el bacilo de Calmette-Guérin (BCG) en músculo de Piaractus mesopotamicus después de 33 días. Materiales y métodos: Cortes histológicos de 3 µm de grosor fueron incubados con las siguientes lectinas: WGA (Wheat germ aglutinin), DBA (Dolichos biflorus agglutin) y HPA (Helix pomatia agglutinin), y los resultados evaluados por medio de microscopia de luz. Resultados: Bacilos ácido resistentes fueron identificados por la tinción de Ziehl Neelsen(ZN). Se observó un marcaje intenso con WGA en el citoplasma de macrófagos. El marcaje con DBA fue intenso en fibroblastos y débil en macrófagos. Con la lectina HPA el marcaje fue intenso en macrófagos, principalmente en los que estaban en estrecho contacto con las células epitelióides, externamente se observó marcaje débil en fibroblastos. Las células epitelióides no fueron marcadas por las lectinas, pero fueron identificadas con la tinción de Hematoxilina-Eosina (HE). Las lectinas tuvieron un tipo de marcaje específico en algunos monosacáridos, como N-acetilglucosamina presente en los bacilos y en macrófagos, y N-acetilgalactosamina en macrófagos. En el grupo control no fue observada inflamación así como tampoco marcaje con las lectinas. Conclusiones. Esta técnica resultó eficiente en la identificación de receptores para las lectinas WGA, DBA y HPA en el granuloma epitelióide inducido por BCG en P. mesopotamicus.

Potential Geographic Distributions and Successful Invasions of Parthenogenetic Broad-Nosed Weevils (Coleoptera: Curculionidae) Native to South America Lanteri, Analia Alicia; Guzman, Noelia Veronica; del Rio, Maria Guadalupe; Confalonieri, Viviana Andrea Ten species of parthenogenetic broad-nosed weevils (Coleoptera: Curculionidae: Entiminae) native to Argentina, southern Brazil, and Uruguay were selected for niche modeling analysis based on climatic data and altitude, to evaluate their potential range expansion inside and outside South America. The selected species belong to Þve genera of the tribe Naupactini affecting economically important crops. Until present, Þve of the 10 species analyzed here have invaded prairies and steppes of countries outside South America (Australia, New Zealand, Mexico, United States, and South Africa):Aramigus tessellatus (Say),Atrichonotus sordidus (Hustache),Atrichonotus taeniatulus (Berg), Naupactus leucoloma Boheman, and Naupactus peregrinus (Buchanan). Our niche modeling analyses performed with MAXENT demonstrated that these areas would be also suitable for Aramigus conirostris (Hustache), Eurymetopus fallax (Boheman), Pantomorus auripes Hustache, Pantomorus ruizi (Bre`thes), and Pantomorus viridisquamosus (Boheman), consequently, they also have the potential to invade areas outside their native ranges, mainly in southeastern United States, some European countries (e.g., Portugal, France, and southern England), South Africa, New Zealand, and southeastern Australia. All the studied species share similar environmental requirements, the most important variables being the Mean Temperature of Driest Quarter, the Annual Mean Temperature and Isothermality. Long distance dispersal through commercial trade, and parthenogenetic reproduction would increase the threat of these weevils to crop production worldwide.

Structural changes in data communication in wireless sensor networks Cabral, Raquel da Silva; Aquino, Andre L. L.; Frery, Alejandro César; Rosso, Osvaldo Anibal; Ramirez, Javier Alberto Wireless sensor networks are an important technology for making distributed autonomous measures in hostile or inaccessible environments. Among the challenges they pose, the way data travel among them is a relevant issue since their structure is quite dynamic. The operational topology of such devices can often be described by complex networks. In this work, we assess the variation of measures commonly employed in the complex networks literature applied to wireless sensor networks. Four data communication strategies were considered: geometric, random, small-world, and scale-free models, along with the shortest path length measure. The sensitivity of this measure was analyzed with respect to the following perturbations: insertion and removal of nodes in the geometric strategy; and insertion, removal and rewiring of links in the other models. The assessment was performed using the normalized Kullback-Leibler divergence and Hellinger distance quantifiers, both deriving from the Information Theory framework. The results reveal that the shortest path length is sensitive to perturbations.

Los Break-in parties en América Latina: ¿éxito o fracaso?; The Break-in parties in Latin America: success or failure? Kestler, Thomas; Krause, Silvana; Lucca, Juan Bautista En esta nota de pesquisa se da cuenta del desarrollo teórico y el diseño metodológico del proyecto de investigación “Los Break-in parties en América Latina: ¿éxito o fracaso?”. La propuesta general del proyecto es: analizar las características de estos partidos capaces de “irrumpir” en el sistema de partidos; revelar cómo las condiciones estructurales del momento de la génesis inciden en el desarrollo del partido “hacia adentro” y “hacia afuera”; y establecer una explicación que vincule estos tipos de partidos, su origen y desarrollo, con su éxito o su fracaso posterior. Con base en estos objetivos, en esta nota de pesquisa se llevará a cabo: primero, una revisión bibliográfica sobre el surgimiento de nuevos partidos; segundo, una problematización sobre qué es lo “novedoso” de estas organizaciones; y tercero, una exposición de las principales decisiones teórico y metodológicas para analizar los Break-in parties.; This research note outlines the theoretical development and methodological design of the research project “Break-in parties in Latin America: Success or Failure?”. The aim of the project is to analyze the characteristics of parties that manage to break into the party system – to clarify how structural conditions at the moment of genesis affect the “inward” and “outward” development of these parties and to explain how its origin and development are linked to their subsequent success or failure. To expose these objectives, in this research-note we procede as follows: first, we offer a literature review on the emergence of new parties; second, we discuss what is “new” in these kinds of organizations; and third, we explain our theoretical and methodological approach to analyze the break-in parties in Latin America.

Reproductive ecology and genetic variability in natural populations of the wild potato, Solanum kurtzianum Marfil, Carlos Federico; Masuelli, Ricardo Williams The cultivated potato (Solanum tuberosum ssp. tuberosum) has more than 200 related wild species distributed along the Andes, adapted to a wide range of geographical and ecological areas. Since the last century, several collection expeditions were carried out to incorporate genetic variability into the potato germplasm around the world. However, little is known about the reproductive ecology and genetic population structure of natural potato population from field studies. The aim of this work is to study, in the field, the genetic variability and reproductive strategies of populations of one of the most widely distributed potato species in Argentina, Solanum kurtzianum, growing in Mendoza province. AFLP markers showed that the genetic variability is mainly present among plants within populations, indicating that in the sampled populations, sexual reproduction is more relevant than clonal multiplication (by tubers). Additional evidence was obtained evaluating the genetic diversity in populations with a distribution in patches, where several genotypes were always detected. From a field study performed in the Villavicencio Natural Reserve, we found that the average number of plump seeds per fruit was 94.3, identified and calculated the foraging distance of four insect pollinators, and demonstrated the seed dispersal by storm water channels. We argue that the breeding system, the two modes of reproduction and the ecological interaction described here may have a prominent role in determining the genetic structure of S. kurtzianum populations, and discuss the importance of field studies on population genetics, reproductive biology and ecology to design collections and conservation strategies.

The role of oxidative stress in alterations of hematological parameters and inflammatory markers induced by early hypercholesterolemia Karbiner, María Sofía; Sierra, Liliana; Minahk, Carlos Javier; Fonio, Maria Cristina; Peral, Maria de Los Angeles; Jerez, Susana Josefina Aims: The investigation of the effects of a high cholesterol diet (HD) for a short-time period on hematological parameters and the potential role of oxidative stress and inflammation markers. Main methods: Rabbits were fed either a control diet or a diet containing 1% cholesterol (HD) for 5–6 weeks. The plasma lipid levels, C reactive protein (CRP), total red blood cells (RBC), total white blood cells (WBC), platelet count, packed cell volume (PCV) and leukocyte formula were determined. Oxidative stress was evaluated by the thiobarbituric acid reactive substances (TBARS), total glutathione and GSH serum level measurements. The osmotic fragility and the membrane fluidity of erythrocytes were determined. The levels of total cholesterol and TBARS were also measured in the erythrocyte membrane suspension. Key findings: A decrease in the RBC and PCV was observed in rabbits fed on HD. The membrane rigidity and osmotic fragility were increased, and the morphological changes caused by the HD and TBARS levels in the erythrocyte membrane may account for this phenomenon. The inflammatory markers as the CRP levels, the platelet count, the WBC and the neutrophils were increased. The TBARS and GSH levels in the serum were increased and decreased, respectively. Significance: This study shows that feeding rabbits an HD for a short time induces hematological alterations, disturbances in the oxidant–antioxidant balance and an increase of inflammatory markers. These findings support the importance of the early correction or prevention of high cholesterol levels to disrupt the process leading to the development of cardiovascular diseases.

Control of seedling damping of caused by Rhizoctonia solani and Sclerotium rolfsii using onion broths; Control del mal de los almácigos causado por Rhizoctonia solani y Sclerotium rolfsii con caldos de cebolla Rivera, Marta Carolina; Wright, Eduardo Roberto; Fabrizio, Maria del Carmen; Freixá, G.; Cabalini, R.; Lopez, Silvia Edith Damping off is a frequent disease that kills seedlings. Cultural control is the only tool in organic crops to manage this disease, and only empirical information is available on the efficiency of plant preparations. This work evaluates the effects of fermented onion decoctions on the growth of Rhizoctonia solani and Sclerotium rolfsii and disease incidence. Broth (B) and sterilized broth (SB) were respectively obtained by boiling chopped yellow onions in water, and incubating for 14 days at room temperature, with or without subsequent sterilization. The pathogens were grown on PDA supplemented with B and SB at 1.7, 3.3, 8.3, 16.7 and 25% (v/v). Their growth was reduced by B at 8.3, 16.7 and 25%. Production of sclerotia by S. rolfsii was diminished by B, but stimulated by SB. Penicillium purpurogenum, P. simplicissimum and Aspergillus niger obtained from B behaved as antagonistic against both pathogens, showing antibiosis, competition and hyperparasitism in dual confrontations with them. Broth and SB at 10 and 50% were sprayed on chard (Beta vulgaris), tomato (Solanum lycopersicum), pepper (Capsicum annuum) and eggplant (Solanum melongena) seedlings cultivated in pathogen-colonized soil. Damping off incidence in B treatments at 50% was markedly lower than the observed for SB. It is concluded that B antifungal activity depends on its dilution and mycota. Broth sprays should be considered as a tool to control damping off in low-environment-impact crop production. Further studies are needed for a complete understanding of B chemical and microbiological components, as well as their changes during fermentation.; El mal de los almácigos causa muerte de plántulas. Los controles cultural y biológico constituyen las únicas herramientas orgánicas para su manejo. Acerca de la eficiencia de preparaciones vegetales, sólo se encuentra información de divulgación. Este trabajo evalúa el efecto de caldos fermentados de cebolla sobre el crecimiento de Rhizoctonia solani y Sclerotium rolfsii y la incidencia de la enfermedad. Se obtuvieron caldo (B) y caldo esterilizado (SB), respectivamente, mediante hervido de trozos de cebollas y fermentación a temperatura ambiente, con o sin esterilización posterior. Se cultivaron los patógenos en APG suplementado con B y SB diluidos 1,7; 3,3; 8,3; 16,7 y 25%. Su crecimiento decreció con B al 8,3, 16,7 y 25%. La producción de esclerocios por S. rolfsii disminuyó con B, pero aumentó con SB. Penicillium purpurogenum, P. simplicissimum y Aspergillus niger aislados de B evidenciaron antibiosis, competencia e hiperparasitismo respecto de ambos patógenos. B y SB diluidos 10 y 50% fueron aplicados en almácigos de acelga (Beta vulgaris), tomate (Solanum lycopersicum), pimiento (Capsicum annuum) y berenjena (Solanum melongena) infestados. La pérdida de plántulas fue menor en el tratamiento con B al 50%, en relación al tratamiento con SB. Se concluye que la actividad antifúngica de B depende de su dilución y de su micota. La utilización de caldos de cebolla debería ser contemplada como alternativa para el manejo fitosanitario de bajo impacto ambiental. Se requiere continuar los estudios para completar el conocimiento acerca de los componentes químicos y microbiológicos de los caldos, y sus posibles cambios durante la fermentación.

The runaway binary LP 400-22 is leaving the Galaxy Kilic, Mukremin; Gianninnas, A.; Brown, Warren R.; Harris, Hugh C.; Dahn, Conard C; Agüeros, M. A.; Heinke, Craig O.; Kenyon, S. J.; Panei, J. A.; Camilo, Fernando We present optical spectroscopy, astrometry, radio and X-ray observations of the runaway binary LP 400-22. We refine the orbital parameters of the system based on our new radial velocity observations. Our parallax data indicate that LP 400-22 is significantly more distant (3σ lower limit of 840 pc) than initially predicted. LP 400-22 has a tangential velocity in excess of 830 km s-1; it is unbound to the Galaxy. Our radio and X-ray observations fail to detect a recycled millisecond pulsar companion, indicating that LP 400-22 is a double white dwarf system. This essentially rules out a supernova runaway ejection mechanism. Based on its orbit, a Galactic Centre origin is also unlikely. However, its orbit intersects the locations of several globular clusters; dynamical interactions between LP 400-22 and other binary stars or a central black hole in a dense cluster could explain the origin of this unusual binary.

First record of Procyon cancrivorus (G. Cuvier, 1798) (Carnivora, Procyonidae) in stratigraphic context in the Late Pleistocene of Brazil Rodriguez, Sergio G.; Soibelzon, Leopoldo Héctor; Rodrigues, Shirlley; Morgan, Cecilia Clara; Bernardes, Camila; Avilla, Leonardo; Lynch, Eric Although five genera of procyonids are currently present in South America, only two of the extant genera, Procyon and Nasua are represented in the South American fossil record. A recent discovery of a procyonid lower second molar in Late Pleistocene deposits of Aurora do Tocantins, northern Brazil, offers potential to further our understanding of the stratigraphic and temporal range of South American fossil procyonids. We use geometric morphometric analysis of two-dimensional landmarks and semilandmarks to explore morphological variation in the lower second molars of extant Procyon lotor and Procyon cancrivorus and multivariate methods to support the identification of the Pleistocene specimen as P. cancrivorus. This material represents the second fossil record of P. cancrivorus in South America Procyonids entered South America in two phases: the first comprising by Cyonasua and Chapadmalania during the Late Miocene, and the other recent genera, beginning in the Late Pleistocene. These Late Miocene procyonids were more carnivorous than Late Pleistocene-Recent omnivorous taxa and possible went extinct due to competition with other placental carnivorans that entered South America and diversified during the latest Pliocene-Early Pleistocene.

An artificial neural network model for prediction of quality characteristics of apples during convective dehydration Di Scala, Karina Cecilia; Meschino, Gustavo; Vega Gálvez, Antonio; Lemus Mondaca, Roberto; Roura, Sara Ines; Mascheroni, Rodolfo Horacio In this study, the effects of hot-air drying conditions on color, water holding capacity, and total phenolic content of dried apple were investigated using artificial neural network as an intelligent modeling system. After that, a genetic algorithm was used to optimize the drying conditions. Apples were dried at different temperatures (40, 60, and 80 °C) and at three air flow-rates (0.5, 1, and 1.5 m/s). Applying the leave-one-out cross validation methodology, simulated and experimental data were in good agreement presenting an error < 2.4 %. Quality index optimal values were found at 62.9 °C and 1.0 m/s using genetic algorithm.

Genetic dissection of a motility-associated c-di-GMP signalling protein of Pseudomonas putida Österberg, Sofia ; Åberg, Anna ; Herrera Seitz, Karina; Wolf Watz, Magnus ; Shingler, Victoria Lack of the Pseudomonas putida PP2258 protein or its overexpression results in defective motility on solid media. The PP2258 protein is tripartite, possessing a PAS domain linked to two domains associated with turnover of c-di-GMP – a cyclic nucleotide that controls the switch between motile and sessile lifestyles. The second messenger c-di-GMP is produced by diguanylate cyclases and degraded by phosphodiesterases containing GGDEF and EAL or HD-GYP domains respectively. It is common for enzymes involved in c-di-GMP signalling to contain two domains with potentially opposing c-di-GMP turnover activities; however, usually one is degenerate and has been adopted to serve regulatory functions. Only a few proteins have previously been found to have dual enzymatic activities – being capable of both synthesizing and hydrolysing c-di-GMP. Here, using truncated and mutant derivatives of PP2258, we show that despite a lack of complete consensus in either the GGDEF or EAL motifs, the two c-di-GMP turnover domains can function independently of each other, and that the diguanylate cyclase activity is regulated by an inhibitory I-site within its GGDEF domain. Thus, motility-associated PP2258 can be added to the short list of bifunctional c-di-GMP signalling proteins.

Cold-set gelation of high pressure-treated soybean proteins Speroni Aguirre, Francisco José; Añon, Maria Cristina The ability of soybean proteins to form cold-set gels, using high pressure (HP) processing as denaturing agent and calcium incorporation was evaluated. Different protein preparations were assayed: soybean protein isolate (SPI), a b-conglycinin enriched fraction (7SEF) and a glycinin enriched fraction (11SEF). 7SEF formed aggregated gels with low water holding capacity whereas 11SEF did not form self-standing gels. SPI formed the better gels: ordered and with high water holding capacity. SPI gels were relatively soft and their visual aspect, rheological and texture properties, and water holding capacity depended on HP level (400e600 MPa), CaCl2 concentration (0.015e0.020 mol L 1) and protein concentration (85e95 g L 1), thus gels with different characteristics may be obtained. The gels comprised a three dimensional network stabilized by non-covalent interactions with spaces filled of proteins in aqueous solution. The results indicate that it is possible to use HP and subsequent calcium incorporation to form self-standing cold-set gels from soybean proteins. These gels may be of interest to incorporate heat-labile compounds or probiotics during the gelation step.

Elecciones escolares: moral y distinción en la relación escuela-familias; School choices: moral and distinction in the relation family-school; A escolha da escola: moral e distinção na relação família-escola Fuentes, Sebastián Gerardo En el contexto de la fragmentación educativa que caracteriza a la Argentina, este trabajo se propone analizar los modos en que se configura la relación escuela-familia en un grupo social de clase media-alta y alta. Las relaciones se analizan en función de las elecciones escolares que realizan familias de dos tradicionales localidades del Gran Buenos Aires sobre una escuela católica. Ese análisis está estructurado sobre el corpus analítico constituido por entrevistas a directivos, docentes, padres, y jóvenes exalumnos y por registros de observaciones participantes y documentación institucional. En esas elecciones escolares confluyen consideraciones estructuradas en un clima moral, valoraciones morales específicas y de distinción que tejen la relación escuelas-familias.; In the context of the educational fragmentation that characterizes the Argentina, this work proposes to analyze the manners in which is produced the relation family-school in a social group of upper-middle and upper class. The relations are analyzed depending on the school choices that realize families of two traditional localities of the Great Buenos Aires on a catholic school. This analysis is structured on the analytical corpus constituted for the principal's, teacher's, parent's and young's alumni interviews, and for records of participant observation and institutional documentation.; No contexto da fragmentação educativa que caracteriza a Argentina, este trabalho se propõe a analisar os modos pelos quais se configura a relação família-escola em um grupo social de classe média alta e alta. As relações são analisadas em função das escolhas que realizam as famílias de duas localidades tradicionais da Grande Buenos Aires de uma escola católica. A análise está ancorada num corpo analítico constituído por entrevistas a diretores, docentes, pais e jovens ex-alunos, por registros de observação participante e documentação institucional.

La opresión del capitalismo moderno: una reflexión sobre los nuevos métodos de selección de personal; The Oppression of Modern Capitalism: A Reflection on New Recruitment Methods Focas, Brenda Marisa Según las caracterizaciones de los sociólogos de la modernidad mercantilización, enajenación, racionalización, mediatización, fragmentación, burocratización y objetivación son una serie de tendencias crecientes que alejan a la cultura de las esferas subjetivas de las personas y llevan a concebir a los individuos y las relaciones sociales como si fueran cosas. En la actualidad, las exigencias para ser aceptado en un empleo son cada vez más denigrantes y la selección de postulantes adquiere un matiz perverso. A los exámenes de salud y psicológicos también se suman los llamados ?socio-ambientales?, que permiten ?conocer y evaluar al postulante en su domicilio" para observarlo dentro de su ámbito social, familiar, cultural y económico. Este artículo se propone mostrar, a partir de una serie de entrevistas a directivos de consultoras de Recursos Humanos, los criterios que se utilizan para la selección de personal en las medianas y grandes compañías. Además de una reflexión teórica sobre la situación de los empleados en la actualidad.; According to the descriptions given by modern sociologists, the growing trend of mercantilization, alienation, rationalization, mediatization, fragmentation, bureaucratization and objectification, moves culture away from people's subjective spheres, leading to the objectification of people and social relations. At present, job requirements are becoming more and more degrading, giving the recruitment process an evil nuance. To the health and psychological tests, we have to add the so called 'socio-environmental' test, used to 'know and assess the candidate at home', getting acquainted with their social, familiar, cultural and economic environments. This article aims at examining - based on different interviews with managers at Human Resources consultancies - the recruitment criteria used by medium and large companies. This study also includes a theoretical reflection on the current situation of employees.

Las columnas de Eduardo Mendicutti en "El Mundo". Travestismo y crítica cultural Bonatto, Adriana Virginia Desde 1988 Mendicutti colabora en el periódico El Mundo con una columna deopinión1 narrada por una voz ficticia femenina, La Susi, inspirada en la protagonista travesti de su primera novela, Una mala noche la tiene cualquiera, aparecida en 1982. En este trabajo analizaremos la serie publicada en la edición digital del diario entre mayo del 2000 y junio de 2001, ?La Susi en Gutenberg?, destinada a comentar acontecimientos y novedades relacionados con el ámbito literario y editorial español. Según nuestra lectura, el uso de la máscara y, específicamente, el juego del travestismo, funcionan a la manera de plataforma de enunciación que posibilita dar cuenta de la contingencia de cualquier sistema normativo.

Treinta años de políticas educativas y demanda sindical docente Southwell, Myriam Monica El rol del sindicalismo en la apertura democrática debe ser analizado en el marco del discurso de Alfonsín que alcanzó una particular fuerza con la denuncia del pacto militar-sindical.1 Esa importante denuncia marcaría el tono de la vinculación con el mundo sindical y eso se evidenció en que el gobierno no intentó articular a las organizaciones sindicales a su discurso de transición democrática sino vincularlas al pasado autoritario del país. En el posicionamiento gubernamental primaba la tradicional cercanía del sindicalismo a su oponente partido peronista, más que ningún otro aspecto, y sus resistencias para integrarlos a su discurso, debilitó a éste crecientemente.

Predictive Contribution of Personality Traits in a Socio-Cognitive Model of Academic Performance in Mathematics Cupani, Marcos; Pautassi, Ricardo Marcos Social Cognitive Career Theory (SCCT) explains academic performance as a function of conceptually distinct and interrelated cognitive variables. We aimed at extending SCCT?s performance model by examining the direct and indirect ? through socio-cognitive variables - contribution of personality traits on mathematics academic performance. Argentine youths (N = 543) were assessed in mathematics self-efficacy, outcome expectations, performance goals and skills. Personality traits were assessed through the Big Five Questionnaire for Children. Path analyses indicated that the contribution of personality on academic performance was mediated by socio-cognitive mechanisms. The results suggested that (a) students who exhibited higher Conscientiousness scores had higher self-efficacy beliefs and more positive outcome expectations and set more demanding performance goals, and (b) students who had higher Openness/Intellect scores exhibited higher self-efficacy beliefs. Gender did not moderate the relations among cognitive variables but influenced the association between personality traits and cognitive variables. Implications for teachers and guidance counselors are discussed.

El factor de la trasncripción WT-1 y su relación con el desarrollo de la injuria renal inducida durante la nefropatía obstructiva Mazzei, Luciana Jorgelina; Manucha, Walter Ariel Fernando El estudio del desarrollo renal sirve como un paradigma para comprender los mecanismos que son la base de la formación de un órgano. Múltiples genes desempeñan funciones trascendentes en el desarrollo renal temprano, entre los que se destaca WT-1. Se ha comprobado experimentalmente que la proteína WT1 en unos casos reprime y en otros activa la transcripción de numerosos genes, pero sus dianas fisiológicas son poco conocidas. Recientes investigaciones genéticas han permitido caracterizar muchas de las complejas interacciones entre los componentes individuales, sin embargo la concreción de nuevos experimentos bioquímicos, moleculares y funcionales como los propuestos en nuestro y otros laboratorios de investigación, nos permitirán establecer con mayor profundidad el grado de compromiso entre las proteínas participantes y las posibles consecuencias fisiopatogénicas de su desacople