Characterisation of proteolysis profile of Argentinean sheep cheeses made by two different production methods Candioti, Mario César; Bergamini, Carina Viviana; Palma, Susana Beatriz; Busetti, Margarita; Meinardi, Carlos Alberto; Zalazar, Carlos Antonio BACKGROUND: In this work the proteolysis profiles of Argentinean sheep cheeses made by two different production methods were studied in order to develop products with typical and defined features. Cheeses with a starter of Streptococcus thermophilus, curd cut to corn grain size, washed and heated to 43◦C (S cheeses) and cheeses with a mixed starter of Streptococcus thermophilus, Lactobacillus helveticus and Lactobacillus bulgaricus, curd cut to rice grain size, unwashed and heated to 47 ◦C (L cheeses) were manufactured. The cheeses were ripened at 12 ◦C and 80% relative humidity for 180 days and samples were taken throughout this period. RESULTS: Gross composition and primary proteolysis were similar for both types of cheeses. Streptococci counts diminished from 109 to 107 colony-forming units g−1 during ripening in both S and L cheeses. Lactobacilli counts in L cheeses decreased during ripening and disappeared at 180 days. L cheeses had significantly lower pH values and showed higher peptidolysis than S cheeses. Triangle sensory evaluation indicated important differences between the two types of cheeses. CONCLUSION: S cheeses had a low proteolysis level and a soft flavour, making them appropriate for consumption after a short ripening time. L cheeses had a higher proteolysis level and more intense sensory characteristics, making them appropriate for consumption after a longer ripening time.

Effects of neonatal exposure to bisphenol A on steroid regulation of vascular endothelial growth factor expression and endothelial cell proliferation in the adult rat uterus Bosquiazzo, Veronica Lis; Varayoud, Jorgelina Guadalupe; Muñoz de Toro, Monica Milagros; Luque, Enrique Hugo; Ramos, Jorge Guillermo Hormonally controlled vascular changes play a key role in endometrial development and in the differentiation process necessary for implantation. Vascular endothelial growth factor (VEGF) has emerged as one of the central regulators of the uterine vasculature. Hormonal perturbations during neonatal development may alter sex steroid-dependent regulation of VEGF and may ultimately affect fertility later in life. The aim of this study was to determine whether neonatal exposure to the environmental estrogenic chemical bisphenol A (BPA) affects the adult rat uterine response to hormonal stimuli. Newborn female rats were given s.c. injections of vehicle, BPA (0.05 mg/kg per day or 20 mg/kg per day) or diethylstilbestrol (0.2 μg/kg per day) on Postnatal Days 1, 3, 5, and 7. To evaluate the long-term effects, rats were ovariectomized at Postnatal Day 80 and submitted to hormonal replacement. Rats neonatally exposed to xenoestrogens showed a decreased induction of uterine endothelial proliferation and a decreased Vegf mRNA expression in response to ovarian steroid treatment. Also, although the estrogen receptor alpha (ESR1) expression was lower in subepithelial cells than in controls, a higher expression of silencing mediator of retinoic acid and thyroid hormone receptor (NCOR1, also known as SMRT) corepressor was evidenced in the same compartment. The results indicate that disturbed Vegf expression in BPA rats could be the result of changes in endocrine pathways, such as an altered induction of ESR1 and/or NCOR1 expression. Because of the importance of VEGF in the implantation process, our data suggest that neonatal BPA exposure might have negative consequences on female fertility.

Folliculostellate cells in pituitary pars distalis of male viscacha: immunohistochemical, morphometric and ultrastructural study Acosta, Mariano; Filippa, Veronica Palmira; Mohamed, Fabian Heber Folliculostellate ellate cells (FSC) have been reported in pituitary of several mammalian species. FSC morphology and secreted substances have been instrumental to the understanding of their function. The purpose of this work was to perform an immunohistochemical, morphometric and ultrastructural study of the pituitary pars distalis FSC in adult male viscacha and to analyze their relation with hormone secreting cells. Immunohistochemistry and image analysis were carried out in different sectors of the gland, from the middle (sector 1) to the glandular periphery (sector 5). Transmission electron microscopy with lanthanum as electrodense tracer was used. FSC formed follicles with PAS-positive colloid inside. They expressed S-100 protein mainly in both nucleus and cytoplasm. FSC were stellate-like in shape and exhibited short cytoplasmic processes that contacted with blood vessels and endocrine cells. In addition, some follicular colloids were immunostained with anti-S-100 protein. A few FSC were immunostained with anti-glial fibrillary acidic protein (GFAP) and anti-vimentin. The morphometric parameters analyzed (percentages of S-100-positive total, cellular and colloidal areas) increased from sector 1 to sector 3 and then decreased to sector 5. Hormone secreting cells, mainly lactotrophs, gonadotrophs and corticotrophs were associated with FSC and follicles. The ultrastructural study demonstrated that FSC developed junctional complexes and desmosomes between their lateral membranes. Lanthanum freely penetrated the spaces between granulated cells and FSC, but did not penetrate into the follicular lumen. In conclusion: 1) the differential expression of S-100 protein, GFAP and vimentin may indicate different physiological stages of FSC; 2) the expression of these proteins suggests a neuroectodermic origin of these cells; 3) FSC spatial distribution, association with endocrine cells, and the generation of an intercellular communication network suggest that FSC are involved in the pituitary pars distalis paracrine reg ulation of the viscacha.

Changes in floret development patterns that may correlate with sex determination in the PCK clade (Poaceae) Reinheimer, Renata; Zuloaga, Fernando Omar; Vegetti, Abelardo Carlos; Pozner, Raúl Ernesto We investigated changes in floral developmental patterns and sex determination in the PCK (phosphoenolpyruvate carboxykinase) clade using a comparative approach and SEM. We identified variation in patterns of floral development that may be correlated with sex determination. Nine different patterns of floret development were identified, based on sex of the lower floret, sequence of stamen development, and rate of glume and lemma differentiation. Although staminate florets are always formed by the abortion of the gynoecium, the timing of abortion differs among species. Similarly, the formation of sterile lower florets showed different pathways that may operate at the level of floral meristem or organ identity. Finally, we discuss several reasons why patterns described for maize and closely related species may not be easily extrapolated to other grasses.

Environmental impact analysis of methanol recovery in biodiesel production using the waste reduction algorithm WAR; Análisis del impacto ambiental de la recuperación de metanol en la producción de biodiesel usando el algoritmo de reducción de desechos WAR Marticorena, Alfredo A.; Mandagaran, Beatriz Adriana; Campanella, Enrique Angel The environmental impact of recovering methanol in the traditional process of biodiesel production is presented. Biodiesel represents an alternative for diminishing impact on the environment. However, there are several biodiesel production processes and all of them have different impact on the environment. The methodology consists of simulating the process, apply the WAR algorithm for waste reduction and compare the results. Comparison is also done with literature data for similar cases. The analysis shows that methanol recovery transforms the conventional process of biodiesel production into an environmental friendly process.

Selenium-based self-assembled monolayers: the nature of adsorbate-surface interactions de la Llave, Ezequiel Pablo; Scherlis Perel, Damian Ariel In recent years, self-assembled monolayers (SAMs) of selenols have been characterized using electrochemistry, scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), thermal desorption spectroscopy, and other experimental approaches. Interest in the relative stability and conductance of the Se - Au interface as compared to S-Au prompted different investigations which have led to contradictory results. From the theoretical side, on the other hand, the study of selenol-based SAMs has concentrated on the investigation of the electron transport across the Se-Au contact, whereas the structural and the thermodynamic features of the monolayer were essentially neglected. In this Article, we examine the binding of selenols to the Au(111) surface using density functional theory with plane wave basis sets and periodic boundary conditions. Our calculations provide insights on the geometry of the headgroup, the stability of the monolayer, and the electronic properties of the bond. In particular, we propose that the presence of a conjugated backbone might be a major factor determining the relative conductance at the monolayer, by differentially enhancing the intramolecular electron transport in selenols with respect to thiols. This surmise, if confirmed, would explain the conflictive data coming from the available experiments

Electrosynthesis of SER-active silver nanopillar electrode arrays Feng, Jiu-Ju; Lu, Ya-Hui; Gernet, U.; Hildebrandt, Peter; Murgida, Daniel Horacio Here we report a one step electrochemical method for the deposition of pillar-like silver nanostructures on graphite plate electrodes. The devices were tested as SER-active electrode arrays using covalently attached hemin. The nanopillar arrays provide reproducible surface enhanced resonance Raman (SERR) signals within 6% standard deviation and Raman enhancement factors of 1 × 105. They also show good electrochemical performance, as verified by potential-dependent SERR spectroscopy and cyclic voltammetry. Furthermore, the hemin-coated arrays display mediatorless electrocatalytic activity toward NO2-. Thus, the Ag nanopillar arrays present good prospects for their application in sensing devices and for SER/SERR based spectroelectrochemical applications in general.

Modulation of monocrotaline-induced cor pulmonale by grape juice Ludke, Ana R L; Mosele, Francisca; Caron-Lienert, Rafaela; Ribeiro, Maria Flávia; Partata, W?nia; Llesuy, Susana Francisca; Araujo, Alex Sander; Singal, Pawan; Belló-Klein, Adriane The study was designed to test whether the ingestion grape juice (GJ) could modulate monocrotaline (MCT)-induced Cor pulmonale resulting from antioxidant properties. Three-week-old male Wistar rats received GJ (10 mL/kg/day) by gavage for 6 weeks. A single injection of MCT (60 mg/kg body weight intraperitoneally) was administered at the end of the third week. Animals were divided in four groups: control, MCT, GJ, and GJ + MCT. MCT promoted a significant increase in right ventricle (36%) and lung (70%) weight to body weight ratio. There was an increase in the right systolic (38%) as well as in the end diastolic (70%) ventricular pressures. MCT caused a significant decrease in lung endothelial nitric oxide synthase (20%) but increase in lipid peroxidation (13%) and catalase (43%). MCT-induced decrease in the endothelial nitric oxide synthase and increase in the right ventricular end diastolic pressure were prevented by GJ, whereas right systolic ventricular pressure and lung weight to body weight ratio were corrected only partially. MCT-induced increase in heart and right ventricle to body weight ratios was not changed by GJ. GJ blunted MCT-induced increase in lipid peroxidation but had no effect on the changes in catalase and superoxide dismutase activities. GJ appears to offer some protection against MCT-induced Cor pulmonale and right ventricle function changes. Copyright © 2010 by Lippincott Williams & Wilkins.

La revista Católica Criterio y la defensa del hispanismo durante el segundo gobierno de Juan D. Perón (Argentina, 1952-1955); The Catholic journal Criterio and the defense of hispanism during the second government of Juan D. Peron (Argentina, 1952-1955) Glozman, Mara Ruth El segundo gobierno del presidente argentino Juan D. Perón (1952-1955) fue un período de fuertes confrontaciones entre sectores que impulsaban diferentes proyectos político-culturales. Uno de los aspectos polémicos del proyecto gubernamental fue la reivindicación del derecho del Estado nacional argentino para la producción de instrumentos lingüísticos propios, discurso que generó reacciones de rechazo de diferentes sectores sociales y políticos. En aquel contexto, la revista católica Criterio publicó una serie de notas y artículos de opinión en los cuales se expresaba una abierta defensa del legado hispánico y de la autoridad académica en materia idiomática. Este artículo se propone analizar el sistema de representaciones en el que se sustentaba la posición glotopolítica de la revista Criterio, articulando el estudio histórico de las ideologías lingüísticas con el análisis de las principales operaciones discursivo-argumentativas que se despliegan en los textos del corpus.

Detection and characterization of N-glycolyated gangliosides in Wilms tumor by immunohistochemistry Scursoni, Alejandra M.; Galluzzo, Laura; Camarero, Sandra; Pozzo, Norma; Gabri, Mariano Rolando; De Acosta, Cristina Mateo; Vázquez, Ana María; Alonso, Daniel Fernando; De Davila, María Teresa G. Gangliosides are glycolipids present on the cell surface. The N-glycolylated ganglioside NeuGc-GM3 has been described in some neoplasms, such as breast carcinoma and melanoma, but is usually not detected in normal human cells. Our aim was to evaluate the presence of NeuGc-GM3 in Wilms tumor by immunohistochemistry. Postchemotherapy tumors were grouped into different histologic subtypes considering the main preserved component. Formalin-fixed, paraffin-embedded tumor samples were cut into 5-mm sections. The monoclonal antibody 14F7, a mouse IgG1 that specifically recognizes NeuGc-GM3, and a peroxidase-labeled polymer conjugated to secondary antibodies were used. Sections from breast carcinoma were employed as positive controls. Presence of NeuGc-GM3 was evident in 22 of 25 (88%) cases. The staining was stronger in the epithelial component, with a membrane pattern and cytoplasmic diffusion. The stromal component expressed cytoplasmic NeuGc-GM3 in cells with rhabdomyoblastic differentiation. Tubules of adjacent renal tissue were also positive, but no expression of NeuGc-GM3 was detected in nontumoral fetal kidney. Until now, the expression of N-glycolylated gangliosides in pediatric solid tumors has not been investigated. The present study evidenced the expression of NeuGc-GM3 in a high proportion of Wilms tumors, suggesting its potential utility as a specific target of immunotherapy.

Diversity of trichomycetes in larval flies from aquatic habitats in Argentina Siri, Augusto; Lopez Lastra, Claudia Cristina Trichomycetes, mainly from nonbiting midge (Chironomidae), mosquito (Culicidae) and black fly (Simuliidae) larvae (Insecta: Diptera), are reported from diverse freshwater environments principally from previously unexplored areas of Argentina. Four new species of Harpellales are described: Austrosmittium patagonicum, A. lenticum, Smittium basiramosum and Legeriomyces lichtwardtii. This is the first report of Austrosmittium spp. from the Americas and the first report of a Legeriomyces from South America. Two other species (Simuliomyces sp. and Harpella sp.) are described but not named. Fourteen previously described species were recovered, and their geographical distribution and host ranges have been extended for Argentina, with Sm. phytotelmatum, Stachylina lentica, St. lotica and St. penetralis being new records for the country.

Needs Assessment for Climate Information on Decadal Timescales and Longer Vera, Carolina Susana; Barange, M.; Dube, O. P.; Goddard, L.; Griggs, D.; Kobysheva, N.; Odada, E.; Parey, S.; Polovina, J.; Poveda, G.; Seguin, B.; Trenberth, K. Societal needs for climate information on decadal timescales is confirmed in terms of its potential value and relevance as a driver in sector decision-making, but such information is currently lacking. Predictions and observationally based analyses for decadal climate variability and change are needed. In addition, the following issues have been identified as those that must be addressed in order to facilitate effective use of climate information on decadal timescales in the decision-making processes of different socio-economic sectors: building effective partnership systems linking stakeholders, users and decision-making sectors and climate information providers; more research and investment is to translate information of large-scale decadal variations into the regional and local scales required for decisions; maintaining and sustaining the Global Climate Observing System (GCOS), in particular, enhancement of the global ocean observing system; and, ways to assemble, check quality, reprocess and reanalyse datasets relevant to decadal prediction. Ways of securing climate observing systems particularly in least developed regions are urgently needed.

Holomorphic functions and polynomial ideals on Banach spaces Carando, Daniel Germán; Dimant, Veronica Isabel; Muro, Luis Santiago Miguel Given A a multiplicative sequence of polynomial ideals, we consider the associated algebra of holomorphic functions of bounded type, HbA(E). We prove that, under very natural conditions satisfied by many usual classes of polynomials, the spectrum MbA(E) of this algebra “behaves” like the classical case of Mb(E) (the spectrum of Hb(E), the algebra of bounded type holomorphic functions). More precisely, we prove that MbA(E) can be endowed with a structure of Riemann domain over E and that the extension of each f ∈ HbA(E) to the spectrum is an A-holomorphic function of bounded type in each connected component. We also prove a Banach-Stone type theorem for these algebras.

Comparison of marine and river water humic substances in a Patagonian environment (Argentina) Scapini, Maria del Carmen; Conzonno, Victor Hugo; Balzaretti, Vilma Teresa; Fernandez Cirelli, Alicia Structural aspects of humic substances (HSs) in marine waters of Engaño Bay (Atlantic Ocean) and water from the Chubut River (Patagonia, Argentina) were compared. The HSs were isolated, purified, and analyzed using a multiple-method approach for structural characterization: elemental analysis, nuclear magnetic resonance (13C and 1H NMR), infrared spectroscopy (FTIR), UV-visible absorption and fluorescence. Similarities between the marine and freshwater components were evaluated on the basis of N and O contents, H/C and C/N atomic ratios, infrared bands from nitrogen-containing and carboxylic groups, percentage of functional groups obtained from NMR spectra, spectral slope coefficient of absorption spectra, absorbance ratios at 250 and 365 nm (E2/E3), aromaticity, excitation–emission matrices and fluorescence quantum yield. Both the Engaño Bay and Chubut River waters have HSs that are mainly composed of fulvic acids (FAs); although they are very similar, they may be distinguished from one another. Similarities include the predominance of aliphatic carbon content (low aromatic content); however, the water bodies differed in their content of proteins and carboxylic acids. The Engaño Bay FAs have mainly an aquatic origin; although the Chubut River FAs suggest a similar aquagenic origin, there is also evidence of contributions from pedogenic FAs.

Perspectiva bioenergética de los residuos sólidos urbanos en el Valle de Lerma Manrique, Silvina Magdalena; Franco, Ada Judith; Núñez, Virgilio; Seghezzo, Lucas Los residuos sólidos urbanos (RSU), que tradicionalmente se han depositado a cielo abierto en el Valle de Lerma (Salta), podrían comenzar a ser dispuestos en un relleno sanitario regional en función de un proyecto provincial existente. El mencionado proyecto no incluye el aprovechamiento de la energía contenida en los RSU. En este trabajo se consideraron como recursos bioenergéticos potenciales. Dos clases de estimaciones fueron realizadas a partir de diferentes metodologías: a) poder calorífico de los RSU y potencial producción de electricidad y b) potencial biogás a obtenerse y potencial generación eléctrica. El aprovechamiento del potencial energético de estos residuos, sumado a los beneficios por mitigación de gases efecto invernadero, y demás aspectos ambientales, sin duda contribuirán a una mejor calidad de vida para la población del Valle.; The municipal solid waste (MSW), traditionally they have been deposited to opened sky in Lerma's Valley (Salta). Because a current provincial proyect, the MSW might begin to deposite in a sanitary regional landfill. The mentioned project does not include the MSW energy utilization. In this work they were considered to be energetic potential resources. Two classes of estimations were realized from different methodologies: a) heating power of the RSU and potential production of electricity and b) potential biogas to be obtaining and electrical generation. The utilization of the energetic potential of these residues, added to the benefits for gas mitigation greenhouse effect, and other environmental aspects, undoubtedly they will contribute to a better quality of life to the population of the Valley.

Bioenergía en el Valle de Lerma: evaluación de sustentabilidad de alternativas Manrique, Silvina Magdalena; Franco, Ada Judith; Núñez, Virgilio; Seghezzo, Lucas Estudios previos en el Valle de Lerma (Salta) han identificado diferentes sistemas bioenergéticos que podrían ser implementados en la zona. Estos sistemas son altamente complejos: incluyen diferentes etapas (desde su producción a su aplicación), sectores involucrados, disciplinas, recursos, entre otros. A su vez, estos sistemas están embebidos en un entramado social, territorial, y un contexto ambiental determinado. La complejidad resultante y el “nivel” de sustentabilidad de cada sistema deben ser estudiados, por tanto, desde una perspectiva integradora y de múltiples criterios. Los objetivos del presente estudio son: detectar, mediante la opinión de múltiples actores internacionales, los aspectos más importantes en la evaluación de la sustentabilidad de los sistemas bioenergéticos, y aplicar estos criterios en la realización de una Evaluación multi-criterio (EMC) de sistemas bioenergéticos del Valle. La metodología desarrollada se constituye en una herramienta práctica que permitirá una valoración global rápida y completa de sistemas bioenergéticos.; Previous studies in the Lerma Valley (Salta) have identified different bioenergy systems that might be implemented in the region. These systems are complex, since they include different stages, sectors, disciplines, and resources. These systems are also embedded in a specific social, territorial, and environmental context. The resulting complexity and the degree of sustainability of each system must be studied from an integral perspective using multiple criteria. The aims of this study are: i) to detect the most important aspects for the assessment of the sustainability of the bioenergy systems; ii) to apply these criteria in the multiple criteria assessment (MCA) of bioenergy systems of the Valley. Multiple international actors have been consulted through expert opinion polls. The methodology used can be a practical tool for a quick and complete assessment of a number of alternative bioenergy systems in the Lerma Valley and similar places in the region.

Pisces, Anegada Bay protected area, Buenos Aires province, Argentina Llompart, Facundo Manuel; Molina, Juan Manuel; Lopez Cazorla, Andrea Cecilia; Baigun, Claudio Rafael M.; Colautti, Dario Cesar We provide the first list of marine fish from Anegada Bay, a coastal protected area in Buenos Aires Province. Fish records were obtained from gillnets and recreational fishery captures. Thirty seven species belonging to 29 families and 18 orders were identified. The most numerous order was Perciformes with eight families and 10 species. Odontesthes argentinensis, Micropogonias furnieri, Cynoscion guatucupa and Mustelus schmitti were verified in all sampling sites and the last two were the most represented either in the experimental fishing and recreational captures. Presence of Lagocephalus laevigatus extended the so far known range distribution of this fish species, representing the southernmost records in Argentinean coastal waters. The fish fauna composition from Anegada Bay could be considered as from a transitional zone.

A dimensão econômica da teoria política aristotélica; Economical dimension of aristotle's political theory Rossi, Miguel Ángel; Tierno, Patricio O objetivo do artigo é enfatizar o lugar que ocupa a economia na cosmovisão política de Aristóteles, assumindo o pressuposto segundo o qual o filósofo considera a economia como uma dimensão central da mesma forma que uma condição de possibilidade para pensar a comunidade política. Nesse sentido, percorre-se três aspectos de tal problemática. O primeiro aspecto, o mais visível, cujo descobrimento é mérito da hermenêutica arendtiana, é aquele que diz respeito especificamente ao problema da crematística como desconstrução do objeto da política, considerada como vida comunitária ligada ao bom viver. O segundo aspecto é o que conduz o filósofo a vincular, pela primeira vez na história do Ocidente, os regimes políticos à estrutura social da polis. O terceiro aspecto consiste em realizar uma leitura dos regimes políticos na chave econômica, aspecto central das profundas críticas de Aristóteles à oligarquia. Desse modo, deixa-se explícita outra das hipóteses que se sustenta no texto: a de que as reflexões de Aristóteles se concentram na noção de esfera pública e, por isso, privilegiam teoricamente a aristocracia, a politeia e, inclusive, a democracia.; The objetive of the article is to emphasize the place of economics in the political cosmovision of Aristotle under the assumption of economics as a central dimension and a prerequisite of the philosopher's thinking about political community. In that sense, it covers three aspects of that problematic. The firs aspect, the most visible one, which discovery is merit of Arendtian hermeneutics, attends specifically to the problem of bad chrematistic as a deconstruction of the politics's object, in so far as communitarian life is related to the good life. The second aspect allows the philosopher to relate, for the first time in Western history, the political regimes to the social structure of the polis. The third aspect implies a vision of political regimes in economic terms and is the core of Aristotle's profound criticism of oligarchy. In that way, it makes explicit another assumptiom of this paper: that Aristotle's reflections are concentrated on the notion of public sphere and, for that reason, they privilege theoretically aristocracy, politeia, and even democracy.

Indicios arcaicos en la Colección Doncellas, Jujuy (República argentina): El «Yacimiento*» 26 a la luz de un fechado radiocarbónico (4811±39 AP); Vestiges archaïques de la Collection Doncellas, Jujuy (République argentine): «Le site» 26 à la lumière d´une datation au carbon 14 (4811±39 AP); Archaic remains in the Doncellas Collection, Jujuy (Argentina): «Site» 26 in light of carbon dating (4811±39 BP) Perez, Cecilia Beatriz En el presente trabajo se considera a la cestería, en sentido amplio, como una técnica textil que pone en relación dos o más elementos (trama y urdimbre) vegetales flexibles no hilados. Se analizan los materiales cesteros provenientes del enterratorio n.° 26 del sitio Doncellas, en la provincia de Jujuy, República argentina, adscrito a momentos tardíos de la ocupación prehispánica del noroeste argentino. Los resultados del estudio de la muestra completa de artefactos cesteros provenientes de todo el sitio indican una gran uniformidad técnico-morfológica en los mismos. La única excepción la constituye el enterratorio 26 en el que se dan artefactos cesteros de formas y técnicas que no aparecen en los demás conjuntos fúnebres. Un fechado radiocarbónico realizado sobre uno de ellos ubica este conjunto en el Período Arcaico Tardío, varios miles de años antes de lo esperado para la denominada cultura Doncellas, definida a partir de esta Colección.; La vannerie est considérée comme une technique textile dont les éléments végétaux flexibles, non soumis à une procédure de tissage, sont reliés entre eux et créent des surfaces planes. Cet article analyse la vannerie de la tombe 26 du site Doncellas, province de Jujuy (République Argentine). Ce site correspond à l´époque récente de l´occupation préhispanique du nord-ouest argentin. Les résultats de l´étude réalisée sur la vannerie provenant du site indiquent qu´il s´agit d´un ensemble tout à fait homogène en ce qui concerne les formes et les techniques appliquées. Mais la tombe 26 constitue une exception. À la lumière de la datation absolue on peut dire qu´il s´agit d´un ensemble qui correspond à la période Archaïque récente, plusieurs milliers d´années avant l´apparition de la culture Doncellas, définie à partir de cette Collection.; In this text, basketry is considered in its broadest sense as a textile technique that relates two unspun flexible vegetal elements (weft and warp). We analyse two basketry objects found in burial site no. 26 of the Doncellas site, in the province of Jujuy, Argentina. These were dated as late in the pre-hispanic occupation of north-east Argentina. The results of the analysis of all of the samples of wickerwork taken from the entire site indicate uniformity in forms and techniques. The only exception to this is burial site 26, in which are found basketry artifacts of forms and techniques not found in the other funeral ensembles. A carbon dating on one of these placed the assemblage in site 26 in the Late Archaic Period, many thousands of years before that expected for the «Doncellas Culture», defined on the basis on this collection.

A gynandromorph of Xylocopa nigrocincta Smith (Hymenoptera: Apidae); Un ginandromorfo de Xylocopa nigrocincta Smith (Hymenoptera: Apidae) Lucia, Mariano; Abrahamovich, Alberto Horacio; Alvarez, Leopoldo Jesús We describe a mixed gynandromorph of Xylocopa (Neoxylocopa) nigrocincta from a single specimen from Argentina. The specimen presents bilateral asymmetry, with the right half of its head displaying male characters and the left half displaying female characters; the mesosoma presents male characters mostly in the right half of the prothorax, pronotal lobe and distal half of the fore tibia and in the pubescence of tarsus; the rest of the mesosoma and the metasoma display female features.; Se describe un ginandromorfo mixto de Xylocopa (Neoxylocopa) nigrocincta de un ejemplar de Argentina. El ginandromorfo tiene asimetría bilateral en la cabeza, con su mitad derecha con caracteres del macho y su mitad izquierda con caracteres de la hembra. El mesosoma presenta algunas características de macho en la mitad anterior derecha (protorax, lóbulo pronotal, mitad posterior de la protibia y pubescencia del tarso), el resto de meso y metasoma con caracteres de la hembra.