Microfacies and sequence stratigraphy of the Amapa Formation, Late Paleocene to Early Eocene, Foz do Amazonas Basin, Brazil

On the basis of thin-section studies of cuttings and a core from two wells in the Amapa Formation of the Foz do Amazonas Basin, five main microfacies have been recognized within three stratigraphic sequences deposited during the Late Paleocene to Early Eocene. The facies are: 1) Ranikothalia grainstone to packstone facies; 2) ooidal grainstone to packstone facies; 3) larger foraminiferal and red algal grainstone to packstone facies; 4) Amphistegina and Helicostegina packstone facies; and 5) green algal and small benthic foraminiferal grainstone to packstone facies, divisible locally into a green algal and the miliolid foraminiferal subfacies and a green algal and small rotaliine foraminiferal subfacies. The lowermost sequence (Si) was deposited in the Late Paleocene-Early Eocene (biozone LF1, equivalent to P3-P6?) and includes rudaceous grainstones and packstones with large specimens of Ranikothalia bermudezi representative of the mid- and inner ramp. The intermediate and uppermost sequences (S2 and S3) display well-developed lowstand deposits formed at the end of the Late Paleocene (upper biozone LF1) and beginning of the Early Eocene (biozone LF2) on the inner ramp (larger foraminiferal and red algal grainstone to packstone facies), in lagoons (green algal and small benthic foraminiferal facies) and as shoals (ooidal facies) or banks (Amphistegina and Helicostegina facies). Depth and oceanic influence were the main controls on the distribution of these microfacies. Stratal stacking patterns evident within these sequences may well have been related to sea level changes postulated for the Late Paleocene and Early Eocene. During this time, the Amapa Formation was dominated by cyclic sedimentation on a gently sloping ramp. Environmental and ecological stress brought about by sea level change at the end of the biozone LF1 led to the extinction of the larger foraminifera (Ranikothalia bermudezi). (c) 2009 Elsevier B.V. All rights reserved.

Letteratura postmoderna e comunicazione pubblicitaria, problemi teorici e analisi testuali

Premise: In the literary works of our anthropological and cultural imagination, the various languages and the different discursive practices are not necessarily quoted, expressly alluded to or declared through clear expressive mechanisms; instead, they rather constitute a substratum, a background, now consolidated, which with irony and intertextuality shines through the thematic and formal elements of each text. The various contaminations, hybridizations and promptings that we find in the expressive forms, the rhetorical procedures and the linguistic and thematic choices of post-modern literary texts are shaped as fluid and familiar categories. Exchanges and passages are no longer only allowed but also inevitable; the post-modern imagination is made up of an agglomeration of discourses that are no longer really separable, built up from texts that blend and quote one another, composing, each with its own specificities, the great family of the cultural products of our social scenario. A literary work, therefore, is not only a whole phenomenon, delimited hic et nunc by a beginning and an ending, but is a fragment of that complex, dense and boundless network that is given by the continual interrelations between human forms of communication and symbolization. The research hypothesis: A vision is delineated of comparative literature as a discipline attentive to the social contexts in which texts take shape and move and to the media-type consistency that literary phenomena inevitably take on. Hence literature is seen as an open systematicity that chooses to be contaminated by other languages and other discursive practices of an imagination that is more than ever polymorphic and irregular. Inside this interpretative framework the aim is to focus the analysis on the relationship that postmodern literature establishes with advertising discourse. On one side post-modern literature is inserted in the world of communication, loudly asserting the blending and reciprocal contamination of literary modes with media ones, absorbing their languages and signification practices, translating them now into thematic nuclei, motifs and sub-motifs and now into formal expedients and new narrative choices; on the other side advertising is chosen as a signification practice of the media universe, which since the 1960s has actively contributed to shaping the dynamics of our socio-cultural scenarios, in terms which are just as important as those of other discursive practices. Advertising has always been a form of communication and symbolization that draws on the collective imagination – myths, actors and values – turning them into specific narrative programs for its own texts. Hence the aim is to interpret and analyze this relationship both from a strictly thematic perspective – and therefore trying to understand what literature speaks about when it speaks about advertising, and seeking advertising quotations in post-modern fiction – and from a formal perspective, with a search for parallels and discordances between the rhetorical procedures, the languages and the verifiable stylistic choices in the texts of the two different signification practices. The analysis method chosen, for the purpose of constructive multiplication of the perspectives, aims to approach the analytical processes of semiotics, applying, when possible, the instruments of the latter, in order to highlight the thematic and formal relationships between literature and advertising. The corpus: The corpus of the literary texts is made up of various novels and, although attention is focused on the post-modern period, there will also be ineludible quotations from essential authors that with their works prompted various reflections: H. De Balzac, Zola, Fitzgerald, Joyce, Calvino, etc… However, the analysis focuses the corpus on three authors: Don DeLillo, Martin Amis and Aldo Nove, and in particular the followings novels: “Americana” (1971) and “Underworld” (1999) by Don DeLillo, “Money” (1984) by Martin Amis and “Woobinda and other stories without a happy ending” (1996) and “Superwoobinda” (1998) by Aldo Nove. The corpus selection is restricted to these novels for two fundamental reasons: 1. assuming parameters of spatio-temporal evaluation, the texts are representative of different socio-cultural contexts and collective imaginations (from the masterly glimpses of American life by DeLillo, to the examples of contemporary Italian life by Nove, down to the English imagination of Amis) and of different historical moments (the 1970s of DeLillo’s Americana, the 1980s of Amis, down to the 1990s of Nove, decades often used as criteria of division of postmodernism into phases); 2. adopting a perspective of strictly thematic analysis, as mentioned in the research hypothesis, the variations and the constants in the novels (thematic nuclei, topoi, images and narrative developments) frequently speak of advertising and inside the narrative plot they affirm various expressions and realizations of it: value ones, thematic ones, textual ones, urban ones, etc… In these novels the themes and the processes of signification of advertising discourse pervade time, space and the relationships that the narrator character builds around him. We are looking at “particle-characters” whose endless facets attest the influence and contamination of advertising in a large part of the narrative developments of the plot: on everyday life, on the processes of acquisition and encoding of the reality, on ideological and cultural baggage, on the relationships and interchanges with the other characters, etc… Often the characters are victims of the implacable consequentiality of the advertising mechanism, since the latter gets the upper hand over the usual processes of communication, which are overwhelmed by it, wittingly or unwittingly (for example: disturbing openings in which the protagonist kills his or her parents on the basis of a spot, former advertisers that live life codifying it through the commercial mechanisms of products, sons and daughters of advertisers that as children instead of playing outside for whole nights saw tapes of spots.) Hence the analysis arises from the text and aims to show how much the developments and the narrative plots of the novels encode, elaborate and recount the myths, the values and the narrative programs of advertising discourse, transforming them into novel components in their own right. And also starting from the text a socio-cultural reference context is delineated, a collective imagination that is different, now geographically, now historically, and from comparison between them the aim is to deduce the constants, the similarities and the variations in the relationship between literature and advertising.

Decay of imprinted surface waves in polymers

CONCLUSIONS The focus of this work was the investigation ofanomalies in Tg and dynamics at polymer surfaces. Thethermally induced decay of hot-embossed polymer gratings isstudied using laser-diffraction and atomic force microscopy(AFM). Monodisperse PMMA and PS are selected in the Mwranges of 4.2 to 65.0 kg/mol and 3.47 to 65.0 kg/mol,respectively. Two different modes of measurement were used:the one mode uses temperature ramps to obtain an estimate ofthe near-surface glass temperature, Tdec,0; the other modeinvestigates the dynamics at a constant temperature aboveTg. The temperature-ramp experiments reveal Tdec,0 valuesvery close to the Tg,bulk values, as determined bydifferential scanning calorimetry (DSC). The PMMA of65.0 kg/mol shows a decreased value of Tg, while the PS samples of 3.47 and 10.3 kg/mol (Mw

Climate signatures in corals of the tropical-temperate transition zone (Late Miocene, Crete/Greece)

The present study describes a Late Miocene (early Tortonian - early Messinian) transitional carbonate system that combines elements of tropical and cool-water carbonate systems (Irakleion Basin, island of Crete, Greece). As documented by stratal geometries, the submarine topography of the basin was controlled by tilting blocks. Coral reefs formed by Porites and Tarbellastrea occurred in a narrow clastic coastal belt along a „central Cretan landmass“, and steep escarpments formed by faulting. Extensive covers of level-bottom communities existed in a low-energy environment on the gentle dip-slope ramps of the blocks that show the widest geographical distribution within the basin. Consistent patterns of landward and basinward shift of coastal onlap in all outcrop studies reveal an overriding control of 3rd and 4th order sea level changes on sediment dynamics and facies distributions over block movements. An increasingly dry climate and the complex submarine topography of the fault block mosaic kept sediment and nutrient discharge at a minimum. The skeletal limestone facies therefore reflects oligotrophic conditions and a sea surface temperature (SST) near the lower threshold temperature of coral reefs in a climatic position transitional between the tropical coral reef belt and the temperate zone. Stable isotope records (δ18O, δ13C) from massiv, exceptionally preserved Late Miocene aragonite coral skeletons reflect seasonal changes in sea surface temperature and symbiont autotrophy. Spectral analysis of a 69 years coral δ18O record reveals significant variance at interannual time scales (5-6 years) that matches the present-day eastern Mediterranean climate variability controlled by the Arctic Oscillation/North Atlantic Oscillation (AO/NAO), the Northern Hemisphere’s dominant mode of atmospheric variability. Supported by simulations with a complex atmospheric general circulation model coupled to a mixed-layer ocean model, it is suggested, that climate dynamics in the eastern Mediterranean and central Europe reflect atmospheric variability related to the Icelandic Low 10 million years ago. Usually, Miocene corals are transformed in calcite spar in geological time and isotope values are reset by diagenetic alteration. It is demonstrated that the relicts of growth bands represent an intriguing source of information for the growth conditions of fossil corals. Recrystallized growth bands were measured systematically in massive Porites from Crete. The Late Miocene corals were growing slowly with 2-4 mm/yr, compatible with present-day Porites from high latitude reefs, a relationship that fits the position of Crete at the margin of the Miocene tropical reef belt. Over Late Miocene time (Tortonian - early Messinian) growth rates remained remarkably constant, and if the modern growth temperature relationship for massive Porites applies to the Neogene, minimum (winter) SST did not exceed 19-21°C.

Nuovi suoni di balenottera comune (Balaenoptera physalus) nel Mediterraneo occidentale

Fin whale (Balaenoptera physalus) is the only misticeto commonly observed in the Mediterranean. The males emit sounds, classic pulse products in sequences called songs, at 20Hz for sexual purposes: sounds are produced during the spring for migration to the Tirreno-Ligurian-Provençal basin, the summer feeding area, and during the autumn, when there is a migration to the south to meet the winter breeding season. This area in the Mediterranean sea is unknown. The east coast of the Iberian Peninsula is a migration area. The study was conducted by analyzing through Adobe Audition 3.0 and XBAT softwares files audio of 30 minutes recorded in 2006, in 2011 and 2012 at the level of the Columbretes Islands, in the western Mediterranean sea, using two hearing aids: the MARU, used in 2006 and the EAR, used in 2011 and 2012. From the analysis have emerged that, in addition to songs with pulses of 20 Hz, there are new sounds of fin whale never previously recognized: the VFPs (Variable Frequency Pulses), higher-frequency pulses emitted, between 50 and 120Hz and the ramps, a set of 7-8 pulses, pertaining to a particular song, of increasing frequency. Further studies are needed to understand the importance of these new sounds.

Students Helping Students

A Montana Tech student was injured and his home needed to be made wheelchair accessible. Highlands College Construction Technology students designed and constructed an exterior ramp leading to the house as well as interior ramps between levels inside the house.

Modification of aviary design reduces incidence of falls, collisions and keel bone damage in laying hens

Non-cage housing systems for laying hens such as aviaries provide greater freedom to perform species-specific behavior and thus are thought to improve welfare of the birds; however, aviaries are associated with a high prevalence of keel bone damage (fractures and deviations), which is a major welfare problem in commercial laying hens. Potential causes of keel bone damage are falls and collisions with internal housing structures that occur as birds move between tiers or perches in the aviary. The aim of this study was to investigate the scope for reducing keel bone damage by reducing falls and collisions through modifications of aviary design. Birds were kept in 20 pens in a laying hen house (225 hens per pen) that were assigned to four different treatments (n = 5 pens per treatment group) including (1) control pens and pens modified by the addition of (2) perches, (3) platforms and (4) ramps. Video recordings at 19, 22, 29, 36 and 43 weeks of age were used to analyze controlled movements and falls (including details on occurrence of collision, cause of fall, height of fall and behavior after fall) during the transitional dusk and subsequent dark phase. Palpation assessments (focusing on fractures and deviations) using 20 focal hens per pen were conducted at 18, 20, 23, 30, 37, 44, 52 and 60 weeks of age. In comparison to the control group, we found 44% more controlled movements in the ramp (P = 0.003) and 47% more controlled movements in the platform treatments (P = 0.014) as well as 45% fewer falls (P = 0.006) and 59% fewer collisions (P < 0.001) in the ramp treatment. There were no significant differences between the control and perch treatments. Also, at 60 weeks of age, 23% fewer fractured keel bones were found in the ramp compared with the control treatment (P = 0.0053). After slaughter at 66 weeks of age, no difference in keel bone damage was found between treatment groups and the prevalence of fractures increased to an average of 86%. As a potential mechanism to explain the differences in locomotion, we suggest that ramps facilitated movement in the vertical plane by providing a continuous path between the tiers and thus supported more natural behavior (i.e. walking and running) of the birds. As a consequence of reducing events that potentially damage keel bones, the installation of ramps may have reduced the prevalence of keel fractures for a major portion of the flock cycle. We conclude that aviary design and installation of specific internal housing structures (i.e. ramps and platforms) have considerable potential to reduce keel bone damage of laying hens in aviary systems.

Maternal ingestion of radon-222 in drinking water and the absorbed radiation dose to the embryo

Maternal ingestion of high concentrations of radon-222 (Rn-222) in drinking during pregnancy may pose a significant radiation hazard to the developing embryo. The effects of ionizing radiation to the embryo and fetus have been the subject of research, analyses, and the development of a number of radiation dosimetric models for a variety of radionuclides. Currently, essentially all of the biokinetic and dosimetric models that have been developed by national and international radiation protection agencies and organizations recommend calculating the dose to the mother's uterus as a surrogate for estimating the dose to the embryo. Heretofore, the traditional radiation dosimetry models have neither considered the embryo a distinct and rapidly developing entity, the fact that it is implanted in the endometrial layer of the uterus, nor the physiological interchanges that take place between maternal and embryonic cells following the implantation of the blastocyst in the endometrium. The purpose of this research was to propose a new approach and mathematical model for calculating the absorbed radiation dose to the embryo by utilizing a semiclassical treatment of alpha particle decay and subsequent scattering of energy deposition in uterine and embryonic tissue. The new approach and model were compared and contrasted with the currently recommended biokinetic and dosimetric models for estimating the radiation dose to the embryo. The results obtained in this research demonstrate that the estimated absorbed dose for an embryo implanted in the endometrial layer of the uterus during the fifth week of embryonic development is greater than the estimated absorbed dose for an embryo implanted in the uterine muscle on the last day of the eighth week of gestation. This research provides compelling evidence that the recommended methodologies and dosimetric models of the Nuclear Regulatory Commission and International Commission on Radiological Protection employed for calculating the radiation dose to the embryo from maternal intakes of radionuclides, including maternal ingestion of Rn-222 in drinking water would result in an underestimation of dose. ^

Strain-gauge, brushless torque meter

A torque meter comprising hollow-keyed, input and output female shafts adapted to receive the male shafts of the power source and machine respectively. Each shaft has a circular flange whose face is perpendicular to the center line of the shafts. Each flange has a plurality of equally spaced cylindrical recesses machined into the inside face thereto adapted to receive conical inserts therein. Balls are contained by the conical inserts and transmit the rotational movement from the input to the output shaft. A stationary housing extends around the input and output shaft and has a transducer shell secured thereto. When force is applied to the input shaft to cause movement, the balls encounter torsional resistance which causes the balls to roll up the ramps of the conical seat inserts to separate the two torque flanges. The force transmitted through the balls causes rotation to the output shaft and produces tension to the stationary transducer shell. The stationary transducer shell is instrumented with semi-conductor strain gauges.

Biografías del Chacho. Génesis de una interacción polémica entre José Hernández y Domingo F. Sarmiento

La investigación se inició a partir de la formulación de las siguientes hipótesis de trabajo: 1. El Chacho, último caudillo de la montonera de los Llanos de Domingo F. Sarmiento [1868] interactúa polémicamente con Rasgos biográficos del General D. Angel V. Peñaloza de José Hernández [1863], aunque su autor no haya avalado con su firma ningún testimonio acerca de lecturas de la obra periodística ni literaria de quien escribiría el Martín Fierro. 2. Esa interacción textual se enmarca en 'la gran polémica nacional': la que inició Sarmiento con la publicación de Campaña en el Ejército Grande [1852], provocó la respuesta de Juan Bautista Alberdi en sus Cartas sobre la prensa y la política militante en la República Argentina [1853] y no concluyó con la publicación de Las ciento y una de su adversario ni con los otros intercambios polémicos textuales entre ambos autores en ese mismo año 1853. 3. La antinomia irreductible 'civilización versus barbarie', como modelo de identidad nacional y como base para el diseño de una programática para la organización estable del país, es el eje de esa interacción polémica [un bando pretende afianzarla y sus oponentes resquebrajarla]. 4. Vida del Chacho [la reescritura de su primera biografía de Peñaloza emprendida por Hernández en 1875] se reinscribe en 'la gran polémica nacional' en otra coyuntura política. Con el fin de validar estas hipótesis, se profundizó el conocimiento del contexto histórico [1852-1875] y se reunió toda la documentación que fue posible rastrear [en particular, material inédito que en algunos casos no había sido estudiado antes o había sido considerado desde otros enfoques] para reconstruir los avatares y el intertexto de esa prolongada interacción polémica. Durante ese recorrido, se hicieron hallazgos documentales y se descubrieron problemáticas no entrevistas en el punto de partida. Finalmente, un último hallazgo permitió cerrar la secuencia de interacción polémica acotada con el análisis de un enfrentamiento público iniciado por un redactor anónimo que en 1875, desde La Tribuna de Buenos Aires, analiza la génesis de Vida del Chacho y por ese medio ataca a su autor. Hernández reconoce en el redactor anónimo 'la voz de Sarmiento' y dirigiéndose a él responde con una serie de cartas abiertas. La persistencia de la polémica entre Sarmiento y Alberdi en la política nacional no sólo enmarca las primeras biografías del Chacho, que se analizan en el primer apartado ['La gran polémica nacional del siglo XIX como intertexto de las biografías del Chacho'], sino también los temas de los restantes: 'El alineamiento de los adversarios de Sarmiento' [apartado 2], la biografía del Chacho del propio Sarmiento ['Sarmiento contraataca con su biografía del Chacho', apartado 3], la reformulación de la primera versión de la suya que emprenderá Hernández en 1875 -mientras que reescribe el sociolecto de El gaucho Martín Fierro al prepar la 9ª edición- ['Vida del Chacho y El gaucho Martín Fierro: reescrituras de Hernández en 1875', apartado 4] y la última manifestación de la polémica que estos dos autores entablaron a través de su práctica del género biográfico ['El último eslabón de una polémica: Sarmiento vs. Hernández', apartado 5]

Fenomenología de la intercorporeidad

Este artículo se refiere al concepto de intercorporeidad, como una posibilidad de intercambio de partes o piezas entre seres humanos, profundizada por nuevas tecnologías biomédicas. Explica cómo estos intercambios producen otra intersubjetividad, con sus distintas formas de concreción, (transplantes, implantes, transfusiones, donaciones) y analiza sus efectos en un plano biológico, experencial y cultural. Establece nexos entre los posibles procesos de revolución de los cuerpos y su estrecha relación con las transformaciones sociales. Luego el texto al remitirse al concepto de propiedad corporal, muestra diversas posiciones ideológicas que se pueden establecer con los cuerpos, según las apropiaciones y disponibilidades personales, colectivas o universales validadas en un momento particular de la cultura. Con base a estas posibles construcciones sociales, se configuran doctrinas biojurídicas peculiares, que nos exhortan a pensar en la bioética como una teoría de la vida.

Re-pensando el orden colonial: los intercambios hispano-indígenas en el fuerte del río Negro.

El estudio de los procesos de contacto cultural en las fronteras coloniales de América ofrece claves para explicar la dinámica de las relaciones interétnicas, las experiencias de aculturación y la construcción de identidades. Asimismo, permite observar el funcionamiento del orden colonial a partir de los modos en que se estructuraron las relaciones de poder en las áreas donde los indígenas conservaron su autonomía y el control sobre sus territorios y recursos. Desde este horizonte referencial, se analizan las relaciones hispano-indígenas en uno de los últimos frentes en los que se proyectó la expansión hispana desde los imperativos de la política borbónica: los territorios meridionales del Río de la Plata. La aproximación a la problemática del fuerte del río Negro posibilitó identificar las estrategias de unos y otros y reconocer la estabilización de un conjunto de transacciones que definieron un particular régimen de intercambios basado en la reciprocidad. Estas prácticas de naturaleza política y económica favorecieron el mantenimiento de cierto equilibrio de fuerzas que se trasunta en la disminución de la conflictividad fronteriza durante las últimas décadas del período colonial.

Biografías del Chacho. Génesis de una interacción polémica entre José Hernández y Domingo F. Sarmiento

La investigación se inició a partir de la formulación de las siguientes hipótesis de trabajo: 1. El Chacho, último caudillo de la montonera de los Llanos de Domingo F. Sarmiento [1868] interactúa polémicamente con Rasgos biográficos del General D. Angel V. Peñaloza de José Hernández [1863], aunque su autor no haya avalado con su firma ningún testimonio acerca de lecturas de la obra periodística ni literaria de quien escribiría el Martín Fierro. 2. Esa interacción textual se enmarca en 'la gran polémica nacional': la que inició Sarmiento con la publicación de Campaña en el Ejército Grande [1852], provocó la respuesta de Juan Bautista Alberdi en sus Cartas sobre la prensa y la política militante en la República Argentina [1853] y no concluyó con la publicación de Las ciento y una de su adversario ni con los otros intercambios polémicos textuales entre ambos autores en ese mismo año 1853. 3. La antinomia irreductible 'civilización versus barbarie', como modelo de identidad nacional y como base para el diseño de una programática para la organización estable del país, es el eje de esa interacción polémica [un bando pretende afianzarla y sus oponentes resquebrajarla]. 4. Vida del Chacho [la reescritura de su primera biografía de Peñaloza emprendida por Hernández en 1875] se reinscribe en 'la gran polémica nacional' en otra coyuntura política. Con el fin de validar estas hipótesis, se profundizó el conocimiento del contexto histórico [1852-1875] y se reunió toda la documentación que fue posible rastrear [en particular, material inédito que en algunos casos no había sido estudiado antes o había sido considerado desde otros enfoques] para reconstruir los avatares y el intertexto de esa prolongada interacción polémica. Durante ese recorrido, se hicieron hallazgos documentales y se descubrieron problemáticas no entrevistas en el punto de partida. Finalmente, un último hallazgo permitió cerrar la secuencia de interacción polémica acotada con el análisis de un enfrentamiento público iniciado por un redactor anónimo que en 1875, desde La Tribuna de Buenos Aires, analiza la génesis de Vida del Chacho y por ese medio ataca a su autor. Hernández reconoce en el redactor anónimo 'la voz de Sarmiento' y dirigiéndose a él responde con una serie de cartas abiertas. La persistencia de la polémica entre Sarmiento y Alberdi en la política nacional no sólo enmarca las primeras biografías del Chacho, que se analizan en el primer apartado ['La gran polémica nacional del siglo XIX como intertexto de las biografías del Chacho'], sino también los temas de los restantes: 'El alineamiento de los adversarios de Sarmiento' [apartado 2], la biografía del Chacho del propio Sarmiento ['Sarmiento contraataca con su biografía del Chacho', apartado 3], la reformulación de la primera versión de la suya que emprenderá Hernández en 1875 -mientras que reescribe el sociolecto de El gaucho Martín Fierro al prepar la 9ª edición- ['Vida del Chacho y El gaucho Martín Fierro: reescrituras de Hernández en 1875', apartado 4] y la última manifestación de la polémica que estos dos autores entablaron a través de su práctica del género biográfico ['El último eslabón de una polémica: Sarmiento vs. Hernández', apartado 5]

Fenomenología de la intercorporeidad

Este artículo se refiere al concepto de intercorporeidad, como una posibilidad de intercambio de partes o piezas entre seres humanos, profundizada por nuevas tecnologías biomédicas. Explica cómo estos intercambios producen otra intersubjetividad, con sus distintas formas de concreción, (transplantes, implantes, transfusiones, donaciones) y analiza sus efectos en un plano biológico, experencial y cultural. Establece nexos entre los posibles procesos de revolución de los cuerpos y su estrecha relación con las transformaciones sociales. Luego el texto al remitirse al concepto de propiedad corporal, muestra diversas posiciones ideológicas que se pueden establecer con los cuerpos, según las apropiaciones y disponibilidades personales, colectivas o universales validadas en un momento particular de la cultura. Con base a estas posibles construcciones sociales, se configuran doctrinas biojurídicas peculiares, que nos exhortan a pensar en la bioética como una teoría de la vida.

Re-pensando el orden colonial: los intercambios hispano-indígenas en el fuerte del río Negro.

El estudio de los procesos de contacto cultural en las fronteras coloniales de América ofrece claves para explicar la dinámica de las relaciones interétnicas, las experiencias de aculturación y la construcción de identidades. Asimismo, permite observar el funcionamiento del orden colonial a partir de los modos en que se estructuraron las relaciones de poder en las áreas donde los indígenas conservaron su autonomía y el control sobre sus territorios y recursos. Desde este horizonte referencial, se analizan las relaciones hispano-indígenas en uno de los últimos frentes en los que se proyectó la expansión hispana desde los imperativos de la política borbónica: los territorios meridionales del Río de la Plata. La aproximación a la problemática del fuerte del río Negro posibilitó identificar las estrategias de unos y otros y reconocer la estabilización de un conjunto de transacciones que definieron un particular régimen de intercambios basado en la reciprocidad. Estas prácticas de naturaleza política y económica favorecieron el mantenimiento de cierto equilibrio de fuerzas que se trasunta en la disminución de la conflictividad fronteriza durante las últimas décadas del período colonial.