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In recent years, the border shared by Peru, Colombia and Brazil has become an enclave of drug production and trafficking for the international markets. It is a territory whose control is disputed by non-state actors and where state security forces suffer from severe material and transport limitations. This paper takes an ethnographic approach to explain the limitations of border security and the institutional challenges of controlling drug and wood trafficking in this context. It places the ideas of reproduction and social change at the centre of the discussion on drugs and borders, as key ways of thinking about the dynamics of growing and processing coca-derived drugs in the global South. [ABSTRACT FROM AUTHOR]

In this third paper dealing with the algae of Brazil, four Chlorophycophyta and six Chrysophycophyta are described. These organism were found in the so called "Sete Lagoas" Lake-District, State of Minas Gerais. They are: Granulochloris maxima nov. sp., Pseudoquadrigula lagoensis nov. gen., nov. sp., Oedogonium spirostriatum, Pseudochaete crassisetum (Chlorophvceae), Phalansterium digitatum (Chrysophyceae), Tetraedriella polychloris, T. acuta, Goniochloris gigas, Peroniella minuta y Pseudostaurastrum enorme (Xanthophyceae). Except Oedogonium, all these genera are mentioned for the first time for Brazil and also for South America. [ABSTRACT FROM AUTHOR]