Darcy Ribeiro e as perguntas que nunca fiz

Nunca perguntei a Darcy Ribeiro se ele costumava cochilar, mas posso assegurar que não. Mesmo breves, seus sonhos seriam profundos. Porque profundos e infinitos em sua ousadia foram seus sonhos. E não se sonha grande com cochilos leves..

Dualities of Latin America

Determining whether the current situation of Latin America is better described as "post-neoliberalism" or as "commodities consensus" requires an analysis of recent changes in the region. Capitalism has expanded in agriculture and mining, accentuating the preeminence of basic exports. Traditional industry is declining, and remittances and tourism have increased in importance. Local capitalists associated with foreign corporations have replaced the national bourgeoisie, while the exodus of peasants consolidates labor precariousness, poverty, and inequality. At the same time, the United States is deploying troops to reorganize its domination. The South American rebellions have limited neoliberal aggression and achieved unusual victories in other parts of the world. The concept of post-neoliberalism emphasizes the region's political turn toward autonomy but overlooks the persistence of the economic model generated during the previous phase. The opposing concept, commodities consensus, highlights the extractivism prevailing throughout the region but plays down the extreme divergences among right-wing, center-left, and radical governments in all other areas. Both concepts contain part of the truth, but neither fully explains the regional scenario.Para determinar si la situación actual de Latinoamérica es mejor descrita como “postneoliberalismo” o como un “consenso de los commodities” hay que hacer un análisis de los cambios recientes en la región. El capitalismo se ha expandido en la agricultura y la minería, acrecentando la preeminencia de las exportaciones básicas. La industria tradicional ha disminuido, y la importancia del turismo y las remesas ha aumentado. Los capitalistas locales asociados con empresas extranjeras han reemplazado a la burguesía nacional, mientras que el éxodo de los campesinos ha consolidado la precariedad laboral, la pobreza y la desigualdad. Al mismo tiempo, Estados Unidos despliega tropas para reorganizar su dominio. Las rebeliones en América del Sur han puesto barreras a la agresión neoliberal y logrado victorias inusuales en otras partes del mundo. El concepto del postneoliberalismo destaca el giro político de la región hacia la autonomía pero con una tendencia a la persistencia del modelo económico generado durante la fase anterior. El otro concepto, el consenso de las commodities, destaca el extractivismo que prevalece en toda la región pero minoriza las divergencias entre los gobiernos de derecha, centro-izquierda y radicales en todas las demás áreas. Ambos conceptos son parcialmente ciertos, pero no explican totalmente el escenario regional.Fil: Katz, Claudio Isaac. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

PARADOR DE TEJEDA [Material gráfico]

Copia digital. Madrid : Ministerio de Educación, Cultura y Deporte, 201

Advances in structure elucidation of small molecules using mass spectrometry

The structural elucidation of small molecules using mass spectrometry plays an important role in modern life sciences and bioanalytical approaches. This review covers different soft and hard ionization techniques and figures of merit for modern mass spectrometers, such as mass resolving power, mass accuracy, isotopic abundance accuracy, accurate mass multiple-stage MS(n) capability, as well as hybrid mass spectrometric and orthogonal chromatographic approaches. The latter part discusses mass spectral data handling strategies, which includes background and noise subtraction, adduct formation and detection, charge state determination, accurate mass measurements, elemental composition determinations, and complex data-dependent setups with ion maps and ion trees. The importance of mass spectral library search algorithms for tandem mass spectra and multiple-stage MS(n) mass spectra as well as mass spectral tree libraries that combine multiple-stage mass spectra are outlined. The successive chapter discusses mass spectral fragmentation pathways, biotransformation reactions and drug metabolism studies, the mass spectral simulation and generation of in silico mass spectra, expert systems for mass spectral interpretation, and the use of computational chemistry to explain gas-phase phenomena. A single chapter discusses data handling for hyphenated approaches including mass spectral deconvolution for clean mass spectra, cheminformatics approaches and structure retention relationships, and retention index predictions for gas and liquid chromatography. The last section reviews the current state of electronic data sharing of mass spectra and discusses the importance of software development for the advancement of structure elucidation of small molecules