Competition between humic substances and α-amino acids by metal species

The aim of the present work was to carry out experimental comparison between humic substances (HS) and representative α-amino acids (methionine, methionine sulfoxide and cysteine hydrochloride) in relation to the complexation of biologically active trace elements (Al, Cu, Pb, Mn, Zn, Cd and Ni). A mobile time-controlled tangential-flow UF technique was applied to differentiate between HS-metal and α-aminoacids-metal complexes. Metal determinations were conventionally carried out using a ICP-OES. The results showed that HS may be considered as a selective complexing agents with higher metal bonding capability in relation to Al, Cu and Pb, the fact that may be clinically important.

Competition policies in emerging economies: lessons and challenges from Central America and Mexico

Incluye Bibliografía

Models of privatization and development of competition in telecommunications in Central America and Mexico

Incluye Bibliografía

Competition and regulation in the banking system of Central America and Mexico: a comparative study

Incluye Bibliografía

Advantages and limitations of Costa Rica's experience in competition policy. A benchmark for the rest of the countries in the Central American region

Incluye Bibliografía

Banking competition in Mexico

Incluye Bibliografía

Interferěncia da comunidade infestante sobre plantas de Eucalyptus grandis de segundo corte

Currently Brazil is one of the leading paper and pulp producers in the world market, where Sao Paulo State boasts the greatest production. Because of the pulp prices falling in the world market and the low costs of a second coppice rotation, two experiments (started May and December, 2000) were conducted to evaluate the effects of weeds and of weed-free periods (0, 3, 6, 9, 12, 15 and 18 months) on the growth of Eucalyptus grandis second coppice plants. The field trials were set up in a randomized block design with four replicates and the experimental plots consisted of three rows of fve plants. The December weed community was composed mainly of Brachiaria decumbens (Surinam grass) and Panicum maximum (Guinea grass) and the May weed community was composed mainly by B. decumbens and Digitaria insularis (Sour-grass). Weeds had a low negative influence on growth, diameter development and macronutrients content of E. grandis second coppice plants. In both experiments, slight reductions in growth were observed only between the fully weeded and weed-free periods, after 18 months.

Cooperation on competition policy in Latin American and Caribbean bilateral trade agreements

Incluye Bibliografía

Legal and economic interfaces between antidumping and competition policy

Includes bibliography

Multilateral rules on competition policy: an overview of the debate

Includes bibliography

Policy competition for foreign direct investment in the Caribbean Basin: Costa Rica, the Dominican Republic and Jamaica

Includes bibliography

The Mexican film industry and its participation in the global value chain

Includes bibliography

The effectiveness of technical assistance, socio-economic development and the absorptive capacity of competition authorities

Includes bibliography

Best practices in defence of competition in Argentina and Brazil: useful aspects for Central America

Includes bibliography

Competition, oligopoly and technological change in the construction industry: the Argentine case

Includes bibliography