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Age polyethism in Plebeia emerina (Friese) (Hymenoptera: Apidae) colonies related to propolis handling
(Sociedade Entomológica do Brasil, 2010)
Stingless bees collect plant resins and make it into propolis, although they have a wider range of use for this material than do honey bees (Apis spp.). Plebeia spp. workers employ propolis mixed with wax (cerumen) for ...
Sistemas computacionales para tareas estadísticas: posibilidades de cooperación interregional = Computing systems for statistical tasks: possibilities of interregional co-operation
(CEPAL, 1986-08-08)
Presenta en forma sintetica un conjunto de sistemas computacionales que se utilizan actualmente en tareas estadisticas en los paises desarrollados, y describe las actividades que la CEPAL esta desarrollando en este campo ...
Rendimentos crescentes e a distribuição internacional de renda
(Editora 34, 2008)
The existence of increasing returns in high technology industries assigns a path dependent character to the international division of labor. Rich countries, first entrants in these industries, enjoy permanent advantages ...