National University of La Plata

About: National University of La Plata is a education organization based out in La Plata, Argentina. It is known for research contribution in the topics: Population & Large Hadron Collider. The organization has 12993 authors who have published 30013 publications receiving 495118 citations. The organization is also known as: UNLP & Universidad Nacional de La Plata.

Sources, Vertical Fluxes, and Equivalent Toxicity of Aromatic Hydrocarbons in Coastal Sediments of the Río de la Plata Estuary, Argentina

Abstract: Settling particles and bottom sediments collected at 1, 2.5, and 4 km off the metropolitan Buenos Aires coast in the Rio de la Plata were analyzed to evaluate the sources and toxicity of resolved (PAHs) and unresolved (AROUCM) aromatic hydrocarbons. PAHs (0003−2.1 μg g-1) and AROUCM (0.01−78 μg g-1) presented the highest concentrations near the Buenos Aires port and sewer and decreasing values up- and downstream and along on- and offshore gradients. Sediment traps deployed in the Central area revealed large aromatic fluxes (1.3 ± 1.5 and 31 ± 47 mg m-2 day-1 for PAHs and AROUCM). The composition of sedimentary PAHs was dominated by uniformly distributed high molecular weight pyrogenic PAHs (53 ± 11% fluoranthene, pyrene, and heavier PAHs), followed by diagenetically derived perylene more abundant in less polluted sites (29 ± 15%) and lower molecular weight petrogenic PAHs (18 ± 7.1% phenanthrene, anthracene, and methylated compounds), which covaried inversely with perylene. PAH diagnostic ratios indicated...

Ethylene is involved in strawberry fruit ripening in an organ-specific manner.

Abstract: The fruit of the strawberry Fragaria×ananassa has traditionally been classified as non-climacteric because its ripening process is not governed by ethylene. However, previous studies have reported the timely endogenous production of minor amounts of ethylene by the fruit as well as the differential expression of genes of the ethylene synthesis, reception, and signalling pathways during fruit development. Mining of the Fragaria vesca genome allowed for the identification of the two main ethylene biosynthetic genes, 1-aminocyclopropane-1-carboxylic acid (ACC) synthase and ACC oxidase. Their expression pattern during fruit ripening was found to be stage and organ (achene or receptacle) specific. Strawberry plants with altered sensitivity to ethylene could be employed to unravel the role of ethylene in the ripening process of the strawberry fruit. To this end, independent lines of transgenic strawberry plants were generated that overexpress the Arabidopsis etr1-1 mutant ethylene receptor, which is a dominant negative allele, causing diminished sensitivity to ethylene. Genes involved in ethylene perception as well as in its related downstream processes, such as flavonoid biosynthesis, pectin metabolism, and volatile biosynthesis, were differently expressed in two transgenic tissues, the achene and the receptacle. The different transcriptional responsiveness of the achene and the receptacle to ethylene was also revealed by the metabolic profiling of the primary metabolites in these two organs. The free amino acid content was higher in the transgenic lines compared with the control in the mature achene, while glucose and fructose, and citric and malic acids were at lower levels. In the receptacle, the most conspicuous change in the transgenic lines was the depletion of the tricarboxylic acid cycle intermediates at the white stage of development, most probably as a consequence of diminished respiration. The results are discussed in the context of the importance of ethylene during strawberry fruit ripening.

Search for heavy neutral leptons in decays of W bosons produced in 13 TeV pp collisions using prompt and displaced signatures with the ATLAS detector

Abstract: The problems of neutrino masses, matter-antimatter asymmetry, and dark matter could be successfully addressed by postulating right-handed neutrinos with Majorana masses below the electroweak scale. In this work, leptonic decays of W bosons extracted from 32.9 fb−1 to 36.1 fb−1 of 13 TeV proton–proton collisions at the LHC are used to search for heavy neutral leptons (HNLs) that are produced through mixing with muon or electron neutrinos. The search is conducted using the ATLAS detector in both prompt and displaced leptonic decay signatures. The prompt signature requires three leptons produced at the interaction point (either μμe or eeμ) with a veto on same-flavour opposite-charge topologies. The displaced signature comprises a prompt muon from the W boson decay and the requirement of a dilepton vertex (either μμ or μe) displaced in the transverse plane by 4–300 mm from the interaction point. The search sets constraints on the HNL mixing to muon and electron neutrinos for HNL masses in the range 4.5–50 GeV.

Jameson Frederic, Zizek Slavoj. Estudios Culturales. Reflexiones sobre el multiculturalismo. Introducción de Eduardo Grüner. Buenos Aires, Paidós, 1998

Abstract: Frederic Jameson es profesor de Literatura Comparada en la Universidad de Duke y autor de numerosas obras traducidas y publicadas en castellano , entre las que destacamos por su fuerte incidencia en los ambitos de reflexion academica: Documentos de cultura, documentos de barbarie, La carcel del lenguaje, La estetica geopolitica y El posmodernismo o la logica culturaldel capitalismo avanzado. Por su parte, Slavoj Zizek es Doctor en Filosofia, investigador del Instituto de Estudios Sociales de Liubiana, Eslovenia y profesor visitante de la New School for Social Research de Nueva York; entre sus obras mas conocidas se encuentran El sublimeobjeto de la Ideologia, Goza tu sintoma y Mirando al sesgo. Eduardo Gruner es profesor titular de Teoria Politica, en la Facultad de Ciencias Sociales de la Universidad de Buenos Aires, y de Literatura y Cine, en la Facultad de Filosofia y Letras, tambien de la Universidad de Buenos Aires; ha escrito los libros El genero culpable y Lasformas de la espada.