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Search: authors:"J.C. Araujo"

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Análise por difração de raio-x de uma hidroxiapatita carbonatada usando o método de Rietveld

The crystal structure of hydroxyapatite (HAP) is known to permit a great variety of substitutions anionic and cationic. Among these substitutions, the insertion of CO32- group is emphasized for its importance in biomaterial applications. In this work, a synthetic sample of nanostructure carbonated hydroxyapatite (CHA) was submitted to thermal treatment at 500ºC for 6 h. Later the...

Supressão de plantas daninhas por leguminosas anuais em sistema agroecológico na Pré-Amazônia

This study evaluated the efficiency of cover legumes in suppressing weed. A field experiment was arranged in a randomized block design with five replications in an alley cropping system, using Clitoria fairchildiana and four cover species, Mucuna aterrima, Cajanus cajan, Canavalia ensiformes and Calopogonium mucunoides. Weed frequency, density, diversity and biomass were...