Violencia, política y memoria del siglo XX : La nuda vida como protagonista

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Pasado y presente : De la guerra contra la subversión a la guerra contra el delito

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.

Feierstein, Daniel; (2007); El genocidio como práctica social : Entre el nazismo y la experiencia argentina; Bs As; Fondo de Cultura Económica

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Feierstein, Daniel; (2007); El genocidio como práctica social : Entre el nazismo y la experiencia argentina; Bs As; Fondo de Cultura Económica

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

El estatuto del sobreviviente testigo en G. Agamben : Algunas problematizaciones

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Violencia, política y memoria del siglo XX : La nuda vida como protagonista

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Pasado y presente : De la guerra contra la subversión a la guerra contra el delito

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.

Pasado y presente : De la guerra contra la subversión a la guerra contra el delito

Fil: Bilder, Myrna Edith. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación. Instituto de Investigaciones en Humanidades y Ciencias Sociales (UNLP-CONICET); Argentina.

Drained thaw-lake basin soil characteristics of cores from Barrow, Alaska

Arctic soils contain a large fraction of Earth's stored carbon. Temperature increases in the Arctic may enhance decomposition of this stored carbon, shifting the role of Arctic soils from a net sink to a new source of atmospheric CO2. Predicting the impact of Arctic warming on soil carbon reserves requires knowledge of the composition of the stored organic matter. Here, we employ solid state 13C nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared-photoacoustic spectroscopy (FTIR-PAS) to investigate the chemical composition of soil organic matter collected from drained thaw-lake basins ranging in age from 0 to 5500 years before present (y BP). The 13C NMR and FTIR-PAS data were largely congruent. Surface horizons contain relatively large amounts of O-alkyl carbon, suggesting that the soil organic matter is rich in labile constituents. Soil organic matter decreases with depth with the relative amounts of O-alkyl carbon decreasing and aromatic carbon increasing. These data indicate that lower horizons are in a more advanced stage of decomposition than upper horizons. Nonetheless, a substantial fraction of carbon in lower horizons, even for ancient thaw-lake basins (2000-5500 y BP), is present as O-alkyl carbon reflecting the preservation of intrinsically labile organic matter constituents. Climate change-induced increases in the depth of the soil active layer are expected to accelerate the depletion of this carbon.

(Supplemental Table 2) Plant characteristics, GHG fluxes, and soil chemical and microbial properties in experimental treatments in Alexandra Fiord

We evaluated above- and belowground ecosystem changes in a 16 year, combined fertilization and warming experiment in a High Arctic tundra deciduous shrub heath (Alexandra Fiord, Ellesmere Island, NU, Canada). Soil emissions of the three key greenhouse gases (GHGs) (carbon dioxide, methane, and nitrous oxide) were measured in mid-July 2009 using soil respiration chambers attached to a FTIR system. Soil chemical and biochemical properties including Q10 values for CO2, CH4, and N2O, Bacteria and Archaea assemblage composition, and the diversity and prevalence of key nitrogen cycling genes including bacterial amoA, crenarchaeal amoA, and nosZ were measured. Warming and fertilization caused strong increases in plant community cover and height but had limited effects on GHG fluxes and no substantial effect on soil chemistry or biochemistry. Similarly, there was a surprising lack of directional shifts in the soil microbial community as a whole or any change at all in microbial functional groups associated with CH4 consumption or N2O cycling in any treatment. Thus, it appears that while warming and increased nutrient availability have strongly affected the plant community over the last 16 years, the belowground ecosystem has not yet responded. This resistance of the soil ecosystem has resulted in limited changes in GHG fluxes in response to the experimental treatments.