Synthesis, characterization, X-ray crystal structure, DFT calculation, DNA binding, and antimicrobial assays of two new mixed-ligand copper(II) complexes Ebrahimipour, S. Yousef; Sheikhshoaie, Iran; Mohamadi, Maryam; Suarez, Sebastian; Baggio, Ricardo Fortunato; Khaleghi, Moj; Torkzadeh Mahani, Masoud; Mostafavi, Ali Two new Cu(II) complexes, [Cu(L)(phen)] (1), [Cu(L)(bipy)] (2), where L2- = (3-methoxy-2oxidobenzylidene)benzohydrazidato, phen = 1,10 phenanthroline, and bipy = 2,2′ bipyridine, were prepared and fully characterized using elemental analyses, FT-IR, molar conductivity, and electronic spectra. The structures of both complexes were also determined by X-ray diffraction. It was found that, both complexes possessed square pyramidal coordination environment in which, Cu(II) ions were coordinated by donor atoms of HL and two nitrogens of heterocyclic bases. Computational studies were performed using DFT calculations at B3LYP/6-311+G(d,p) level of theory. DNA binding activities of these complexes were also investigated using electronic absorption, competitive fluorescence titration and cyclic voltammetry studies. The obtained results indicated that binding of the complexes to DNA was of intercalative mode. Furthermore, antimicrobial activities of these compounds were screened against microorganisms.

Serosurvey of leptospira interrogans, brucella abortus and chlamydophila abortus infection in free-ranging giant anteaters (myrmecophaga tridactyla) from Brazil; Inquérito sorológico de Leptospira interrogans, Brucella abortus e Chlamydophila abortus em tamanduás-bandeira (Myrmecophaga tridactyla) de vida livre no Brasil Miranda, Flávia; Superina, Mariella; Vinci, Fernanda; Hashimoto, Vanessa; Freitas, Julio César; Matushima, Eliana Reiko A serological survey for antibodies against Leptospira interrogans, Brucella abortus, and Chlamydophila abortus was conducted in 21 clinically healthy, free-ranging giant anteaters (Myrmecophaga tridactyla) from Parque Nacional das Emas (Goiás State, Brazil; n=6), Parque Nacional da Serra da Canastra (Minas Gerais State, Brazil; n=9), and RPPN SESC Pantanal (Mato Grosso State, Brazil; n=6) between July 2001 and September 2006. Sera were screened for antibodies against 22 serovars of Leptospira interrogans with a microscopic agglutination test. Twelve tested positive for L. interrogans serovars sentot (n=5 in PN Emas, n=2 in PN Serra da Canastra), butembo (n=2 in PN Serra da Canastra), autumnalis, bataviae, and shermani/icterohaemorrhagiae (n=1 each in SESC Pantanal). One adult female tested positive for B. abortus with the buffered plate antigen test. All sera were negative for C. abortus using the complement fixation text. This is the first report of pathogens that may interfere with the reproduction and population dynamics of free-ranging giant anteaters.; Inquéritos sorológicos para detecção de anticorpos contra Leptospira interrogans, Brucella abortus, e Chlamydophila abortus foram realizados em 21 tamanduás-bandeira (Myrmecophaga tridactyla) de vida livre do Parque Nacional das Emas (Goiás, Brasil, n=6), o Parque Nacional da Serra da Canastra (Minas Gerais, Brasil, n=9) e RPPN SESC Pantanal (Mato Grosso, Brasil, n=6) entre julho de 2001 e setembro de 2006. Os sor os foram testados para anticorpos contra 22 sorotipos de Leptospira interrogans com um teste de aglutinação microscópica. Doze animais foram considerados positivos para L. interrogans sorovares sentot (n=5 em PN Emas, n=2 em PN Serra da Canastra), butembo (n=2 em PN Serra da Canastra), autumnalis, bataviae e shermani/icterohaemorrhagiae(n=1 para cada sorovar em SESC Pantanal). Uma fêmea adulta testou positivo para B. abortuscom o teste do antígeno tamponado. Todos os soros se mostraram negativos para C. abortusatravés do teste de fixação do complemento. Este é o primeiro relato de patógenos que podem interferir na dinâmica reprodutiva de populações de tamanduás em estado selvagem.

Ira y acedia: dos caras de la mortificación en las psicosis de Battista, Julieta Laura El artículo interroga dos presentaciones frecuentes del malestar en nuestra contemporaneidad: la depresión y la violencia. Para hacerlo, propone extraerlas del campo de las enfermedades y los trastornos –que deberían tratarse terapéuticamente–, para reinscribirlas en la ética del psicoanálisis como posiciones subjetivas del ser. En primer lugar entonces, se propone trocar el par depresión-violencia por el de ira-acedia, al recuperar la referencia de Lacan a La Divina Comedia y explorar las relaciones allí propuestas entre ambas: la contigüidad entre la ira explosiva y la ira lenta o acedia, la tristeza. Se trabajan las referencias de Lacan a la teología medieval con el objetivo de reubicar a la tristeza como falta moral y su redefinición como rechazo del inconsciente, que evita a su vez toda reducción psicologizante o somática. De esta formulación se intentan extraer consecuencias sobre la mortificación que puede generar la posición subjetiva de rechazo en las psicosis, al proponer una lectura de la misma a partir del concepto de deseo y las dificultades que pueden encontrar los psicóticos para sostenerlo.; The article questions two common presentations of discomfort in our contemporary: depression and violence. To do so, the author proposes to extract both of them from the field of diseases and disorders –that can be treated therapeutically–, and enroll them in the ethics of psychoanalysis like subjective positions of being. First then, proposes to change pair depression-violence by anger-acedia, to recover Lacan’s reference to The Divine Comedy and explore relationships between both proposals there: contiguity between the explosive anger and slow anger or acedia. Lacan’s references to medieval theology are worked with the aim of relocating to sadness as moral failure and its redefinition as a rejection of the unconscious, which in turn prevents any psychologizing or somatic reduction. This formulation is trying to draw conclusions about mortification that can generate the subject position of rejection in psychosis, proposing a reading of it from the concept of desire.

Descentrar la mirada : prácticas estatales y sistema médico en la Provincia de Río Negro, Argentina : un aporte etnográfico para los equipos de salud Tozzini, María Alma; Solans, Andrea Mónica Los procesos y prácticas estatales producen efectos sociales, a saber: efecto de aislamiento (sujetos atomizados), efecto de identificación (subjetividades atomizadas en líneas colectivas, de pertenencia/diferenciación), efecto de legilibilidad (producción de un saber, un lenguaje y herramientas empíricas que regulen relaciones entre colectividades) y efecto de espacialización (producción de límites y jurisdicciones) (Trouillot 2001:2). Dentro del ámbito de la salud, estos efectos se logran, entre otras cosas, a partir de la supuesta neutralidad moral de la medicina, presumiendo que términos médicos como enfermedad y tratamiento son moralmente neutrales. Asimismo, se individualizan las dificultades humanas, ignorando o minimizando la dimensión sociocultural del comportamiento humano (Conrad 1982). En este trabajo, nos proponemos describir y analizar desde un abordaje cualitativo con énfasis en la perspectiva etnográfica- un reciente decreto de la Provincia de Río Negro referente a facultades de las Juntas Médicas y al ámbito de la medicina laboral. En dicho decreto se establece que si la indicación del médico tratante supera las 72 horas de licencia para un/a empleado/a público/a, el certificado único de salud provisto por el médico debe ser acompañado por el resumen de la historia clínica. Nuestro objetivo es analizar de qué manera la investigación cualitativa resulta una herramienta útil a la hora de develar tanto ciertas tensiones entre las normas establecidas por el mencionado decreto y las leyes de confidencialidad y de los derechos del paciente; como así también la redefinición en la relación médico paciente al superponer a la del médico, la figura del contralor. En definitiva analizaremos los aportes que la mirada etnográfica puede aportar a los equipos de salud a la hora de examinar determinados efectos de las prácticas estatales como la creación de archivos que portan la fuerza de lo estatal (Bourdieu 1996) o de novedosos vínculos entre las personas- vehiculizadas a través del sistema médico.

¡Y Luis D'Elía Tenía Razón!: el triángulo Argentina-Estados Unidos-Irán Escudé, Carlos Andrés No existen evidencias de que Irán haya perpetrado ninguno de los dos grandes atentados padecidos en Buenos Aires en 1992 y 1994. Sin embargo, la prioridad norteamericana e israelí era desprestigiar al régimen de Teherán. En este trabajo se demuestra que descubrir la verdad les importaba poco y nada.

La ciudad tecnologizada: videovigilancia, espacio público y campañas electorales Lio, Vanesa Gisela Habitamos espacios que son rediseñados a partir de los flujos informacionales, una ciudad atravesada por las TICs. La vida urbana se complejiza a partir de nuevas tecnologías que redefinen los límites territoriales y modifican las relaciones de los sujetos, entre sí y con su entorno. La ciudad, espacio de sociabilidad por excelencia desde la Modernidad, se constituye como escenario de disputas entre amenazas a la seguridad personal y amenazas a la privacidad, que se profundizan cada vez más con la incorporación de dispositivos para la vigilancia y el control en el espacio público.

Capacidades estatales y enfoques alternativos: Capitalizando los activos Garcia Delgado, Daniel Reynaldo En un tiempo de inflexión en donde se juega la continuidad o discontinuidad delmodelo de desarrollo con inclusión social iniciado hace ya más de una década,consideramos la necesidad de profundizar la problemática de la mejora de lascapacidades estatales. O en todo caso, preguntarnos: ¿Capacidades para qué? ¿Paraqué tipo de Estado? ¿Enfoques alternativos a cuáles?

"Close-to-ideal" tumor boron targeting for boron neutron capture therapy is possible with "less-than-ideal" boron carriers approved for use in humans Schwint, Amanda Elena; Trivillin, Verónica Andrea

Clases y reproducción social: el espacio social cordobés en la primera década del siglo XXI; Class and social reproduction: the social space in Córdoba at the first decade of the twenty first century Gutiérrez, Alicia Beatriz; Mansilla, Hector Osvaldo En este artículo proponemos una construcción del espacio social del Gran Córdoba (Argentina) en la última década, como primer momento (objetivista) de una investigación sobre las estrategias de reproducción social de las distintas clases y fracciones de clase que lo componen. Ello supone hacer una elección teórica respecto a la manera de concebir las clases sociales y su conjunto y proponer una articulación teórico-metodológica para su construcción empírica. Asimismo, conlleva una serie de decisiones técnicas destinadas a adecuar esa articulación con la utilización de las fuentes de datos del sistema estadístico nacional. Partiendo de la noción bourdieusiana de espacio social, proponemos una construcción relacional de las clases y fracciones a partir del conjunto de recursos Ñfundamentalmente económicos y culturalesÑ que disponen las familias para su reproducción. Para ello, apelamos a la utilización de métodos de estadística descriptiva multidimensional conforme a la escuela francesa de análisis de datos. Aplicamos de manera conjunta métodos factoriales y de clasi cación, tomando como base la información captada por la vEncuesta Permanente de Hogaresw en los terceros trimestres de los años 2003 y 2011. La construcción del espacio social, que identi ca cuatro grandes clases con sus respectivas fracciones y muestra una estructura homóloga en ambos períodos, nos permitirá explicitar el debate teórico en torno a las clases y su dinámica, mostrar el valor heurístico de las decisiones tomadas previamente, y las condiciones de posibilidad para poner en marcha la etapa cualitativa de la investigación.; In this paper we propose a construction of the social space of Gran Córdoba (Argentina) in the last decade, as a  rst moment (objectivist) of a research about social reproductionls strategies of the different classes and class fractions that compose it. This implies a theoretical choice about the way to conceive the social classes and the dynamics of their reproduction. It also means to propose a theoretical and methodological articulation for its empirical construction. It also entails a series of technical decisions to adapt this articulation with the use of the data sources from the national statistical system. Based on the notion of social space (Bourdieu), we propose a relational construction of classes and fractions from the set of family resources available for their social reproduction, mainly economical y cultural. For this construction we apply jointly factorial methods and classi catory methods, based on the information captured by the vEncuesta Permanente de Hogaresw in the third quarters of 2003 and 2011. The construction of social space, which identi es four main classes with their respective fractions and shows a homologous structure in both periods, will allow us to make explicit the theoretical debate about the classes and their dynamics, to show the heuristic value of the decisions previously made, and it is the conditions of possibility for implementing the qualitative stage of the research.

Hablar el animal. Las performances kafkianas Yelin, Julieta Rebeca Las exploraciones teóricas de la crítica literaria, así como también las de otros discursos dedicados al análisis de diversas disciplinas artísticas, se enfrentan desde hace algunas décadas al debilitamiento de los fundamentos del pensamiento humanista, y a las consecuencias que ese deterioro ha tenido sobre los conceptos con que abordaba, e incluso delineaba, sus objetos de estudio. Esto no es una novedad; y sin embargo, es una constatación que no deja de producir fisuras y desplazamientos en nuestro campo de estudio, abocado cada vez con mayor interés a los desarrollos de la filosofía, la antropología o la biopolítica, de donde procura extraer herramientas críticas para abordar la zooliteratura contemporánea, contextualizar sus búsquedas formales, explicar las cegueras y resistencias de algunas de las lecturas más cristalizadas. Nos proponemos reflexionar sobre los aportes que estos cruces interdisciplinares pueden realizar a una crítica literaria que se pretenda posthumanista, es decir, que se enraíce en la tradición biocéntrica en que se inscriben, entre otras, las obras de Friedrich Nietzsche y Franz Kafka. La performance como forma no representativa de aproximación al animal será una de las herramientas críticas centrales para este propósito.; Theoretical explorations of literary criticism and those dedicated to the analysis of various artistic disciplines are facing the weakening of the foundations of humanist thought, as well as the consequences this process has had on the concepts it had had developed to address—and even to outline—its objects of study. This is not a novelty; however it is a finding that continues to produce fissures and displacements in our field of study, lately more concentrated and with greater interest in the reflections of philosophy, anthropology and biopolitics. From these, it seeks to extract critical tools to address the contemporary zooliterature, contextualize its formal searches and explain the blindness and resistance of some of the most crystallized readings. We intend to think about the contributions that interdisciplinary crossings can make to a posthumanist literary criticism, that is to say, a criticism rooted in the biocentric tradition in which are inscribed, among others, the works of Franz Kafka and Friedrich Nietzsche. One of the central critical tools for this purpose will be the performance, understood as a not representative way of approximation to animals.

Comerciantes británicos en el Rio de la Plata. En torno a la construcción de una comunidad mercantil (1810-1860) Silveira, Alina Durante la primera mitad del siglo XIX gran cantidad de británicos ingresaron al puerto de Buenos Aires. Algunos de ellos eran comerciantes y constituyeron un grupo de gran visibilidad. El objetivo del presente artículo es indagar sobre la conformación de una comunidad mercantil británica a partir del estudios de los ámbitos de sociabilidad por los cuales transitaron y las instituciones voluntarios que construyeron. A su vez, esperamos que este estudio nos permita brindar mayores elementos analíticos que nos posibiliten comprender la inserción económica de los británicos en Buenos Aires antes de 1880 así como contribuir a los estudios sobre la sociabilidad porteña previa a 1850.; During the first half of the nineteenth century many British arrived at Buenos Aires. Some of them were merchants. This article will analyze the erection of a British mercantile community. We will study the sociability sphere were they circulated and the voluntary associations they erected. Also we hope our study will help us understand the economic insertion of the British activities in Buenos Aires before 1880 and the local sociability sphere.

The antimicrobial peptide microcin J25 stabilizes the gel phase of bacterial model membranes Rintoul, Maria Regina; Morero, Roberto Dionisio; Dupuy, Fernando Gabriel The bacterial membrane interaction of the antimicrobial peptide microcin J25 was studied with the probe-free techniques Langmuir monolayers and infrared spectroscopy. Membrane model systems composed by phosphatidylethanolamine:phosphatidylglycerol 7:3, which mimic the cytoplasmic membrane of Gram negative bacteria, were used in both monolayer and bilayer approaches. The peptide reduced the transition surface pressure of the expanded-to-condensed lipid monolayer states, as well as increased the gel-to-liquid crystalline transition temperature in bilayers, indicating a stabilization of membrane ordered state. In addition, a reduction of the surface pressure at which condensed domains appeared was observed upon mixed monolayers compression after microcin J25 adsorption. The results indicate a favorable interaction of microcin J25 with bacterial membrane model systems. Also, the effects on the ordered phases stabilization are discussed in terms of the biological effects observed in membranes of sensitive cells.

Physiological, structural and molecular traits activated in strawberry plants after inoculation with the plant growth-promoting bacterium Azospirillum brasilense REC3 Guerrero Molina, María Fernanda; Lovaisa, Nadia Carolina; Salazar, Sergio Miguel; Martinez Zamora, Martin Gustavo; Diaz Ricci, Juan Carlos; Pedraza, Raúl Osvaldo The plant growth‐promoting strain REC3 of Azospirillum brasilense, isolated from strawberry roots, prompts growth promotion and systemic protection against anthracnose disease in this crop. Hence, we hypothesised that A. brasilense REC3 can induce different physiological, structural and molecular responses in strawberry plants. Therefore, the aim of this work was to study these traits activated in Azospirillum‐colonised strawberry plants, which have not been assessed until now. Healthy, in vitro micropropagated plants were root‐inoculated with REC3 under hydroponic conditions; root and leaf tissues were sampled at different times, and oxidative burst, phenolic compound content, malondialdehyde (MDA) concentration, callose deposition, cell wall fortification and gene expression were evaluated. Azospirillum inoculation enhanced levels of soluble phenolic compounds after 12 h post‐inoculation (hpi), while amounts of cell wall bound phenolics were similar in inoculated and control plants. Other early responses activated by REC3 (at 24 hpi) were a decline of lipid peroxidation and up‐regulation of strawberry genes involved in defence (FaPR1), bacterial recognition (FaFLS2) and H2O2 depuration (FaCAT and FaAPXc). The last may explain the apparent absence of oxidative burst in leaves after bacterial inoculation. Also, REC3 inoculation induced delayed structural responses such as callose deposition and cell wall fortification (at 72 hpi). Results showed that A. brasilense REC3 is capable of exerting beneficial effects on strawberry plants, reinforcing their physiological and cellular characteristics, which in turns contribute to improve plant performance.

Structural-functional approach to identify post-disturbance recovery indicators in forests from northwestern Patagonia: a tool to prevent state transitions Cavallero, Laura; López, Dardo Rubén; Raffaele, Estela; Aizen, Marcelo Adrian The disruption of the natural post-disturbance recovery process, either by changes in disturbance regime or by another disturbance, can trigger transitions to alternative degraded states. In a scenario of high disturbance pressure on ecological systems, it is essential to detect recovery indicators to define the period when the system needs more protection as well as the period when the system supports certain use pressure without affecting its resilience. Recovery indicators can be identified by non-linear changes in structural and functional variables. Fire largely modulates the dynamic and stability of plant communities worldwide, and is this the case in northwestern (NW) Patagonia. The ultimate goal of this study is to propose a structural-functional approach based on a reference system (i.e. chronosequence) as a tool to detect post-disturbance recovery indicators in forests from NW Patagonia. In NW Patagonia (40-42°S), we sampled 25 Austrocedrus chilensis and Nothofagus spp communities differing in post-fire age (0.3-180 yr). In each community we recorded structural (woody species cover and height, solar radiation, air temperature, relative humidity) and functional (annual recruitment of woody and tree species) attributes. We modelled these attributes in function of post-fire age and analized the relationship between a functional attribute and a Structural Recovery Index (SRI). Communities varying in time-since-last-fire were structurally and functionally different. Moreover, response variables showed non-linear changes along the chronosequence, allowing the selection of recovery indicators. We suggest to use vegetation variables instead of environmental variables as structural recovery indicators. Horizontal and Vertical Vegetation Heterogeneity indices provided the information necessary to describe vegetation spatial reorganization after fire. Tree species annual recruitment was a good indicator of the functional recovery of forest communities. The relationship between a functional attribute and SRI allowed us to detect phases with high- and low-risk of degradation during post-fire succession. High-risk phases (< 36 yr old) had the highest horizontal vegetation heterogeneity and scarce tree seedling density (< 7,000 seedlings.ha-1.yr-1). Whereas, low-risk phases (> 36 yr old) had the highest vertical vegetation heterogeneity and tree species seedling density (> 10,000 seedlings.ha-1.yr-1). Due to the low structural-functional levels, communities at high-risk phases would be more vulnerable to antropic pressure (e.g. livestock raising, logging) than communities at low-risk phases. The proposed approach contributes to the sustainable management of forest communities because it allows to estimate the minimum structural-functional levels from which forest communities could be harvested.

La prensa y el impacto de las Cortes de Cádiz en el Perú; The press and the impact of the Cortes de Cádiz in Perú Morán Ramos, Luis Daniel; Aguirre, María Las independencias en Iberoamérica y particularmente la coyuntura de las Cortes de Cádiz han marcado profundamente el proceso revolucionario y la configuración política de las actuales naciones hispanoamericanas. El virreinato peruano vivió durante aquel contexto de cambios una profusión de impresos que pusieron en evidencia la importancia de la difusión de la información y su lectura en la convulsionada vida política peruana. Ésta investigación busca explicar, a través del análisis de la prensa y otros impresos, el impacto que las reformas de las Cortes ocasionaron en el Perú y la imagen que la prensa construyó de aquel proceso.; Independence in Latin America and particularly the situation of the Cortes of Cádiz have deeply marked the revolutionary process and the political configuration of the current Latin American Nations. The Peruvian Viceroyalty lived during that context of changes a vast profusion of forms that put in evidence the importance of the dissemination of information and reading in the tumultuous Peruvian political life. This research seeks to explain, through the analysis of the press and other printed material, the impact of the reforms in Peru and the image that the press built from the process.

Philornis downsi (Diptera: Muscidae), an avian nest parasite invasive to the Galápagos Islands, in Mainland Ecuador Bulgarella, Mariana; Quiroga, Martin Anibal; Brito Vera, Gabriel A.; Dregni, Jonathan S.; Cunninghame, Francesca; Mosquera Muñoz, Denis A.; Monje, Lucas Daniel; Causton, Charlotte E.; Heimpel, George E. Philornis downsi (Dodge and Aitken) is a bird-parasitic muscid fly native to mainland South America that recently invaded the Galápagos Islands where it is parasitizing Darwin's finches and other land birds. This parasite was previously known only from Argentina, Brazil, and Trinidad and Tobago. The first report of P. downsi from mainland Ecuador is provided, supporting the hypothesis that the invasion route of P. downsi from its native range to the Galápagos Islands includes mainland Ecuador. Four different morphologies of pupal exuviae, which belong to different fly species, were uncovered. Dipteran puparia were found in 20% of naturally occurring nests collected in 2013 and in 27% of nests in 2014 at the two sites in western Ecuador. P. downsi accounted for 74% and 40% of the puparia in 2013 and 2014, respectively. Two new bird host species for the genus Philornis were recorded: the streak-headed woodcreeper (Lepidocolaptes souleyetii) and the fasciated wren (Campylorhynchus fasciatus). The levels of nest parasitism found were much lower than levels reported for the Galápagos Islands. Finally, parasitism of P. downsi by a parasitoid in the genus Brachymeria (Hymenoptera, Chalcididae) is documented. Overall, 9% of fly puparia collected in 2013, and 19% of those collected in 2014, had parasitoid emergence holes.

Generalized Ginzburg-Landau approach to inhomogeneous phases in nonlocal chiral quark models Carlomagno, Juan Pablo; Gomez Dumm, Daniel Alberto; Scoccola, Norberto Nerio We analyze the presence of inhomogeneous phases in the QCD phase diagram within the framework of nonlocal chiral quark models. We concentrate in particular in the positions of the tricritical (TCP) and Lifshitz (LP) points, which are studied in a general context using a generalized Ginzburg-Landau approach. We find that for all the phenomenologically acceptable model parametrizations considered the TCP is located at a higher temperature and a lower chemical potential in comparison with the LP. Consequently, these models seem to favor a scenario in which the onset of the first order transition between homogeneous phases is not covered by an inhomogeneous, energetically favored phase.

Peces marinos, peces fluviales: explotación diferencial por grupos cazadores-recolectores del noreste de Chubut (Patagonia central, Argentina) Svoboda, Ariadna; Gomez Otero, Julieta La incorporación de peces a la dieta de grupos cazadores-recolectores puede evaluarse en función de su densidad, la disponibilidad de recursos de mayor tamaño corporal, la tecnología disponible, entre otros. En este trabajo se aborda la variabilidad en el registro ictiofaunístico durante el Holoceno tardío en dos áreas: el valle inferior del río Chubut y su desembocadura y costa adyacente. De acuerdo a la productividad ambiental, la disponibilidad de recursos de alta jerarquía y las oportunidades de captura de peces, se genera un modelo de subsistencia que evalúa la diversidad e importancia relativa de los peces para las dos áreas. Las expectativas zooarqueológicas derivadas son discutidas a partir de los muestreos faunísticos de las localidades Barranca Norte y Los Cangrejales Sur (desembocadura y costa) y los sitios Loma Grande 1 y Cinco Esquinas 1 (valle inferior), ubicados a unos 30 y 18 km del mar respectivamente. Los resultados arrojan diferencias en la riqueza taxonómica de peces: en el valle predominan las percas, mientras que en la desembocadura y costa se explotó una amplia variedad. Se registró una importante contribución de peces en ambas áreas; sin embargo, en los campamentos residenciales de la desembocadura los restos de peces son menos frecuentes.; The incorporation of fish into the diet of hunter-gatherers can be evaluated on the basis of their densities, the abundance of high-ranked resources and available technology. This paper examines the variability of the late Holocene ichthyoarchaeological record in two environ- mental areas: the lower valley of the Chubut River, along with its mouth and adjacent marine coast. According to environmental productivity, high-ranked resources availability and capture opportunities, a subsistence model is generated. This model evaluates diversity and relative impor- tance of fish for the two areas. Zooarchaeological expectations inferred are discussed on account of faunal samples taken from different archaeological sites, such as Barranca Norte and Los Can- grejales Sur (located at the river mouth and marine coast), Loma Grande 1 and Cinco Esquinas 1 (located on the valley, at 30 and 18 km distance from sea). Results show differences in fish taxo- nomic richness with perch dominant in the valley sites, whereas a high range of fish was found at the river mouth and marine coast sites. Although an important contribution of fish registered in both areas was recorded; in residential camps at the river mouth fish remains were scarce.

Geodynamic controls on the contamination of Cenozoic arc magmas in the southern Central Andes: Insights from the O and Hf isotopic composition of zircon Jones, Rosemary E.; Kirstein, Linda; Kasemann, Simone A.; Dhuime, Bruno; Elliott, Tim; Litvak, Vanesa Dafne; Alonso, Ricardo Narciso; Hinton, Richard; Edinburgh Ion Microprobe Facility Subduction zones, such as the Andean convergent margin of South America, are sites of active continental growth and crustal recycling. The composition of arc magmas, and therefore new continental crust, reflects variable contributions from mantle, crustal and subducted reservoirs. Temporal (Ma) and spatial (km) variations in these contributions to southern Central Andean arc magmas are investigated in relation to the changing plate geometry and geodynamic setting of the southern Central Andes (28–32 S) during the Cenozoic. The in-situ analysis of O and Hf isotopes in zircon, from both intrusive (granitoids) and extrusive (basaltic andesites to rhyolites) Late Cretaceous – Late Miocene arc magmatic rocks, combined with high resolution U–Pb dating, demonstrates distinct across-arc variations. Mantle-like d18O(zircon) values (+5.4& to +5.7& (±0.4 (2r))) and juvenile initial eHf(zircon) values (+8.3 (±0.8 (2r)) to +10.0 (±0.9 (2r))), combined with a lack of zircon inheritance suggests that the Late Cretaceous (73 Ma) to Eocene (39 Ma) granitoids emplaced in the Principal Cordillera of Chile formed from mantle-derived melts with very limited interaction with continental crustal material, therefore representing a sustained period of upper crustal growth. Late Eocene (36 Ma) to Early Miocene (17 Ma) volcanic arc rocks present in the Frontal Cordillera have ‘mantle-like’ d18O(zircon) values (+4.8& (±0.2 (2r) to +5.8& (±0.5 (2r))), but less radiogenic initial eHf(zircon) values (+1.0 (±1.1 (2r)) to +4.0 (±0.6 (2r))) providing evidence for mixing of mantle-derived melts with the Late Paleozoic – Early Mesozoic basement (up to 20%). The assimilation of both Late Paleozoic – Early Mesozoic Andean crust and a Grenville-aged basement is required to produce the higher than ‘mantle-like’ d18O(zircon) values (+5.5& (±0.6 (2r) to +7.2& (±0.4 (2r))) and unradiogenic, initial eHf(zircon) values (3.9 (±1.0 (2r)) to +1.6 (±4.4 (2r))), obtained for the Late Oligocene (23 Ma) to Late Miocene (9 Ma) magmatic rocks located in the Argentinean Precordillera, and the Late Miocene (6 Ma) volcanic rocks present in the Frontal Cordillera. The observed isotopic variability demonstrates that the assimilation of pre-existing continental crust, which varies in both age and composition over the Andean Cordillera, plays a dominant role in modifying the isotopic composition of Late Eocene to Late Miocene mantle-derived magmas, implying significant crustal recycling. The interaction of arc magmas with distinct basement terranes is controlled by the migration of the magmatic arc due to the changing geodynamic setting, as well as by the tectonic shortening and thickening of the Central Andean crust over the latter part of the Cenozoic.

Late Cenozoic contractional evolution of the current arc-volcanic region along the southern Central Andes (35°20′S) Tapia, Felipe; Farías, Marcelo; Naipauer, Maximiliano; Puratich, Jacqueline The Andean internal zone records deformation, uplift and erosion that serve as proxies of variations on mountain building dynamics. Hence, the study of this region would give keys to understand the factors controlling the orogenic evolution. Structural, stratigraphic and geochronological data in the Andean internal zone at 35°20′S evidence that this region has only underwent contractional deformation since the late Miocene up to present, differing from coeval Pleistocene extensional tectonics affecting the retro-arc. Contractional deformation was characterized by the development of a piggy-back basin in the latest Miocene filled by synorogenic deposits. Afterward, an out-of-sequence thrusting event affected the region since at least the Pliocene until the Present. Shortening in the inner part of the Andean orogen would be favored by both the high orthogonality of the out-sequence structures with respect to the plate convergence vector and by the minor resistance to shortening produced by the southward decrease of the orogen height and by the removal of material via erosion of the uplifted mountain belt. In contrast, oblique structures, as those described farther north, accommodate strike-slip displacement. Likewise, we propose that erosion from the inner orogen favored the prolongation of the out-of-sequence thrusting event until the Present, differing from the situation north of the 34°S where this event ended by the Pliocene.