Políticas de representación y poder: la práctica artística del español Santiago Sierra

La presente tesis, es un estudio sobre las políticas de representación y poder en el arte relacional de la obra del artista español Santiago Sierra, en la cual se realizó un análisis en torno al papel protagónico del uso de la representaciones en el arte contemporáneo como una construcción discursiva que parte de una base más amplia, como es la cultura y la sociedad del sistema mundo-capitalista colonial. En esta investigación se problematizan las política de representación del sujeto marginal, y se reconoce en la forma de hacer arte relacional del artista regímenes de poder, por cuanto el Otro representado es el cuerpo en donde confluyen repositorio de desigualdades y superioridades fundadas a partir de la cultura.  Así, en el primer capítulo, se plantea un recorrido por el arte relacional y antagónico con la cultura, y como la primera se nutre de la segunda, desde el manejo de la violencia del Arte Contemporáneo, pasando por los regímenes escópicos y, hasta la operación de la representación.  Posteriormente, en el segundo capítulo, se analiza las políticas de representación de las que se nutre Sierra para realizar su obra, tales como: la otredad, la diferencia, el estereotipo, la cosificación y el espectáculo. Siendo estas una forma de representar, lo que denominaremos pornomiseria en arte. Partiendo también, desde las perspectivas visuales sobre el cuerpo del sujeto marginal, tales como, la racialización, la sexualización y el canibalismo a partir de dos obras: los penetrados y Persona remunerada por una jornada de 360 horas continuas.

¿Trasplantes incaicos o etnogénesis poscolonial? El origen de los salasacas de la Sierra ecuatoriana (Estudios)

The salasacas are an indigenous group with a controversial history of origen. Many manuscripts state that they descend from an uprooted Inca population that traveled north from present Bolivia to their new settlement that is now Ecuador. The article presents an alternative narrative that identifies three separate migrations to Salasaca, by different indigenas groups, in the Sixteenth Century. It shows that the modern Salasacan nationality emerged during colonial and postcolonial transformations. It contends that the ethnic distinction of the salasacas is due to the fact that they opted to collectively unite as one solid ethnic group in order to remain as an Indigenas enclave in a region that was experiencing whitening or widespread emergence of half castes.

Cambio climático, agua y conflicto: disputas sociales, crisis hídrica y oportunidades de adaptación en la Sierra Centro- Norte de Ecuador. Estudio de caso: conflicto por el uso del agua entre la ciudad de Quito y la cuenca agropecuaria de Güitig

La conflictividad por el uso del agua, tanto a nivel local como global, tiene sus raíces en la relación del ser humano con la naturaleza. Dicha relación ha entrado en conflicto desde la constitución del modelo capitalista que mira a la Naturaleza como una caja de recursos, en donde se inserta el agua. El presente estudio pretende ilustrar la evolución del concepto de conflicto: ambiental, socioambiental e hídrico; con el fin de conocer de manera general la conflictividad por el uso del agua dentro del contexto de la crisis hídrica (local, regional y global) y agudizada por el cambio climático, mediante la presentación de un caso de conflicto por el uso del agua entre el campo y la ciudad, en la Sierra centro-norte del Ecuador. La metodología empleada en esta investigación parte del análisis y evolución del conflicto socioambiental hídrico, para luego (desde lo general a lo particular) revisar la dinámica de la crisis hídrica y los conflictos emblemáticos internacionales, regionales y locales. El trabajo incluyó la lectura y el diálogo académico con autores expertos en conflictos socioambientales, la integración del componente científico del cambio climático mediante la revisión de los informes técnicos más actualizados en todo nivel y la investigación in situ del caso de la conflictividad local en la zona de estudio (cuenca social de Güitig versus la ciudad de Quito). El resultado principal de la investigación afirma la hipótesis de la investigación: el cambio climático se presenta como un factor no tradicional integral que agudiza, acelera, complejiza y potencia los impactos de los demás factores estructurales, que tradicionalmente determinan la conflictividad hídrica: socioeconómicos, socioambientales, socioculturales, políticos e institucionales. Dependiendo de la gestión que se aplique, el mismo puede convertirse en una oportunidad para solucionar la conflictividad estructural.

Knowledge, attitudes and practices of farmers on rodent pests and their management in the lowlands of the Sierra Madre Biodiversity Corridor, Philippines

A survey of the knowledge, attitudes and practices (KAP) of 100 rice farmers and 50 coconut farmers was conducted in the coastal lowland agro-ecosystems of the Sierra Madre Biodiversity Corridor, Luzon, Philippines to identify current rodent management practices and to understand the extent of rat damage and the attitudes of farmers to community actions for rodent management. Pests were most commonly listed as one of the three most important rice and coconut production constraints. Other major crop production constraints were typhoons and insufficient water. Farmers consider rats to be the major pest of coconut and of rice during the wet season rice crop, with average yield losses of 3.0% and 13.2%, respectively. Rice and coconut farmers practised a wide range of rodent management techniques. These included scrub clearance, hunting and trapping. Of the 42 rice farmers and 3 coconut farmers that applied rodenticides to control rodents, all used the acute rodenticide, zinc phosphide. However, only ten rice farmers (23.8%) applied rodenticides prior to the booting stage and only seven farmers (15.6%) conducted pre-baiting before applying zinc phosphide. The majority of farmers belonged to farmer organisations and believed that rat control can only be done by farmers working together. However, during the last cropping season, less than a third of rice farmers (31.2%) applied rodent management as a group. In order to reduce the impact of rodents on the farmers of the coastal lowlands of the Sierra Madre Biodiversity Corridor, integrated management strategies need to be developed that specifically target the pest rodents in a sustainable manner, and community actions for rodent management should be promoted.

The effects of UV radiation on photosynthesis estimated as chlorophyll fluorescence in Zygnemopsis decussata (Chlorophyta) growing in a high mountain lake (Sierra Nevada, Southern Spain)

The effect of increased UV radiation on photosynthesis estimated as in vivo chlorophyll fluorescence i.e. optimal quantum yield (F(v)/F(m)) and electron transport rate (ETR) in the green filamentous alga Zygnemopsis decussata (Streptophyta, Zygnematales) growing in the high mountain lake ""La Caldera"" (Sierra Nevada, Spain) at 3050 m altitude was evaluated. Two sets of in situ experiments were conducted: (1) On July 2006, F(v)/F(m) was measured throughout the day at different depths (0.1, 0.25, 0.5 and 1 m) and in the afternoon. ETR and phenolic compounds were determined. In addition, in order to analyze the effect of UV radiation, F(v)/F(m) was determined in algae incubated for 3 days at 0.5m under three different light treatments: PAR+UVA+UVB (PAB). PAR+UVA (PA) and PAR (P). (2) On August 2007, F(v)/F(m) was determined under PAB, PA and P treatments and desiccation/rehydration conditions. F(v)/F(m) decreased in algae growing in surface waters (0.1 m) but also at 1 m depth compared to that at 0.5 in depth. The decrease of F(v)/F(m) at noon due to photoinhibition was small (less than 10%) except in algae growing at 1 m depth (44%). The maximal electron transport rate was 3.5-5 times higher in algae growing at 0.25-0.5 m respectively than that at 0.1 and 1 m depth. These results are related to the accumulation of phenolic compounds: i.e. the algae at 0.25-0.5 in presentedrespectively about a 3-5 times higher concentration of phenolic compounds than that of algae at 0.1-1 m depth. The protection mechanisms seem to be stimulated by UVB radiation, since F(v)/F(m) was higher in the presence of UVB (PAB treatment) compared to PA or P treatments. UVA exerts the main photoinhibitory effect, not Only at midday, but also in the afternoon. UVB radiation also had a protective effect in algae grown under desiccation conditions for three days. During re-hydration, the rapid increase of F(v)/F(m) (after 1 h) was higher in the UVB-grown algae than in algae grown under UVA radiation. After 5 h. F(v)/F(m) values were similar in algae submitted to desiccation/rehydration under PAB and P treatments as they were in the control (submerged algae). The combined effect of desiccation and UVA produced the greatest decrease of photosynthesis in Z. decussata. Thifs UVB, in contrast to other species, may support the recovery process. Z. decussata can acclimate to severe stress, conditions in this high mountain lake by the photoprotection mechanism induced by UVB radiation through dynamic photoinhibition and the accumulation of phenolic compounds (UV screen and antioxidant substances).

Evaluation of petrogenetic models for intermediate and silicic plutonic rocks from the Sierra de Valle Fertil-La Huerta, Argentina: Petrologic constraints on the origin of igneous rocks in the Ordovician Famatinian-Puna paleoarc

The whole Valle Fertil-La Huerta section appears as a calc-alkaline plutonic suite typical of a destructive plate margin. New Sr and Nd isotopic whole-rock data and published whole-rock geochemistry suggest that the less-evolved intermediate (dioritic) rocks can be derived by magmatic differentiation, mainly by hornblende + plagioclase +/- Fe-Ti oxide fractional crystallization, from mafic (gabbroic) igneous precursors. Closed-system differentiation, however, cannot produce the typical intermediate (tonalitic) and silicic (granodioritic) plutonic rocks, which requires a preponderant contribution of crustal components. Intermediate and silicic plutonic rocks from Valle Fertil-La Huerta section have formed in a plate subduction setting where the thermal and material input of mantle-derived magmas promoted fusion of fertile metasedimentary rocks and favored mixing of gabbroic or dioritic magmas with crustal granitic melts. Magma mixing is observable in the field and evident in variations of chemical elemental parameters and isotopic ratios, revealing that hybridization coupled with fractionation of magmas took place in the crust. Consideration of the whole-rock geochemical and isotopic data in the context of the Famatinian-Puna magmatic belt as a whole demonstrates that the petrologic model postulated for the Sierra Valle Fertil-La Huerta section has the potential to explain the generation of plutonic and volcanic rocks across the Early Ordovician paleoarc from central and northwestern Argentina. As the petrologic model does not require the intervention of old Precambrian continental crust, the nature of the basement on which thick accretionary turbiditic sequences were deposited remains a puzzling aspect. Discussion in this paper provides insights into the nature of magmatic source rocks and mechanisms of magma generation in Cordilleran-type volcano-plutonic arcs of destructive plate margins. (C) 2010 Elsevier Ltd. All rights reserved.

Petrogenesis of Upper Paleozoic post-collisional peraluminous leucogranites, Sierra de Ancasti, northwest Argentina

The Santa Rosa and Sauce Guacho plutons are two post-collisional peraluminous Late Devonian to Early Carboniferous leucogranites that intruded the banded schists of the Ancasti Formation. The leucogranites are composed of microcline phenocrysts along with quartz, plagioclase, muscovite, biotite, ilmenite, tourmaline, apatite, monazite and zircon. Their geochemical composition is consistent with S-type granites and mineralogically they belong to MPG granites (muscovite-peraluminous granites). It is proposed that granite magma generation was related to shear zones that concentrated fluids in the metasedimentary crust during a collision or transcurrent tectonics. U-Pb analyses on monazite gave an age of 369.8 +/- 5.3 Ma, while Sm/Nd isotopic data yield epsilon(Nd(t)) values of -5.3 for Sauce Guacho and -5.7 for Santa Rosa indicating crustal provenance. Nd model ages between 1,544 and 1,571 Ma are within the range of magmatic rocks from the Lower Ordovician Famatinian Arc in the Central Sierras Pampeanas.

Post-collisional lamprophyric event in Sierra Norte, Cordoba, Argentina: Mineralogical, geochemical and isotopic characteristics

Over 20 lamprophyre dykes, varying in width between a few centimeters and several meters, have been identified in central Sierra Norte - Eastern Pampean Ranges, Cordoba, Argentina. Their mineralogy and chemistry indicate that they are part of the calc-alkaline lamprophyres clan (CAL). They contain phenocrysts of magnesiohomblende +/- augite set in a groundmass of magnesiohornblende, calcic-plagioclase, alkali feldspar, and opaque minerals, which designate them as spessartite-type lamprophyres. Alteration products include chlorite, calcite and iron oxides after malfic phenocrysts, though some are partially replaced by actinolite. Feldspars are replaced by carbonate and clay minerals. The dykes are relatively primitive, and show restricted major element variation (SiO(2) 51.1-55.3 wt.%, Al(2)O(3) 12-16.6 wt.%, total alkalies 1.5-4.7 wt.%), high Mg# (55-77), high Cr contents (27-988 ppm) and moderate to high Ni contents (60-190 ppm). Lamprophyre LILE (e.g. Rb averages 110 ppm, Sr 211-387 ppm, Ba 203-452 ppm) are high relative to HFSE (e.g., Ta 0.2-1.6 ppm, Nb 4-11 ppm, Y 17-21 ppm), and are enriched in LREE (30-70 times chondrite). They are characterized by relatively high (208)Pb/(204)Pb (38.8-39.9), (207)Pb/(204)Pb(similar to 15.7), and (206)Pb/(204)Pb (18.7-20.1), combined with low (epsilon)epsilon(Nd) (-4.69 to -1.52) and a relative moderately high ((87)Sr/(86)Sr)(i) of 0.7055-0.7074. The Rb-Sr whole rock isochron indicates an Early Ordovician age of 485 +/- 25 Ma. The calculated T(DM) (1.7 Ga) suggests that these rocks appear to have originated from a reservoir that was created during a mantle metasomatism event related to the Pampean orogeny. The Sierra Norte lamprophyres show affinities with a subduction-related magma in an active continental margin. Their geochemical and isotopic features suggest a multicomponent source, composed of enriched mantle material variably contaminated by crustal components. The lamprophyric suite emplacement occurred at the dawning stage of the Pampean orogeny, in a regional post-collisional extensional setting developed in the Sierra Norte-Ambargasta batholith (SNAB) in Early Ordovician times. (C) 2008 Published by Elsevier Ltd.

Post-conflict peacebuilding: strategies and lessons from Bosnia and Herzegovina, El Salvador and Sierra Leone

Includes bibliography

Fecundidad de la población yanomanmii de sierra Parima (territorio federal Amazonas, Venezuela)

Incluye Bibliografía