Las TIC en las instituciones públicas para la agricultura en América Latina: los casos de Costa Rica, el Paraguay y el Uruguay

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Sistemas de protección social en América Latina y el Caribe: Paraguay

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Social protection systems in Latin America and the Caribbean: Paraguay

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El mercado de tierras rurales en Paraguay

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Concentration of Cu(II) and Cd(II) from natural river water by Adsorption on a Modified Silica Surface

A high surface area silica gel (737 ± m2 g-1) was synthesized modified through a two-step reaction with a 4-amino-2-mercaptopyrimidine ligand and applied to Cu(II) and Cd(II) adsorption from an aqueous medium. The modified material was characterized by FTIR, which showed that attachment of the molecule occurred via thiol groups at 2547 and 2600 cm-1, and by elemental analysis that indicated the presence of 0.0102 mmol of ligand. The data from adsorption experiments were adjusted to a modified Langmuir equation and the maximum adsorption capacity was 6.6 and 3.8 μmol g-1 for Cu(II) and Cd(II), respectively. After adjusting several parameters, the material was applied in the preconcentration of natural river water using a continuous flow system before and after sample mineralization, and the results showed a 10-fold enrichment factor. The proposed method was validated through preconcentration and analysis of certified standard reference material (1643e), whose results were in agreement with the values provided by the manufacturer.

Vascular plants of oxbow lakes of Turvo River, Upper Paraná River basin, São Paulo State, Brazil

Vascular plants were investigated in oxbow lakes of Turvo River, Upper Paraná River basin, between Icém and Nova Granada municipalities, state of São Paulo, Brazil. In this region, six lagoons were sampled: Ganzella, Mustafá, Braço Morto, 45, Federal, and Parente. The survey showed a total of 54 species, 36 genera and 22 families. The species richest families were Poaceae, Cyperaceae, and Polygonaceae. Eichhornia crassipes (Pontederiaceae) was the single species encountered in all the six lakes. © 2010 Check List and Authors.

Evaluando la equidad vertical y horizontal en el impuesto al valor agregado y el impuesto a la renta: el impacto de reformas tributarias potenciales. Los casos del Ecuador, Guatemala y el Paraguay

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Análisis del módulo educación en los censos de población de Paraguay

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Management procedures for sustainable development (applicable to municipalities, micro-regions and river basins)

Includes bibliography

Las metas del milenio y la igualdad de género: el caso de Paraguay

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La institucionalidad de género en un contexto de cambio de gobierno: el caso de Paraguay

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La reforma educativa en el Paraguay

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Gestión de programas sociales en América Latina: análisis de casos, Vol. V: el Programa de Inversión Social en Paraguay, PROPAIS

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