Resumo O presente artigo pretende discutir como o escritor queniano Ngugi Wa Thiong’o aborda a história de três de seus livros: Um grão de trigo, Descolonizar a mente e Memórias em tempos de guerra. Em um primeiro momento, elabora-se uma introdução a respeito de como o autor foi estudado no Brasil, passando a seguir para uma discussão de como ele desenvolveu sua historiografia literária em três momentos que vão da escrita em inglês, seguindo pela crítica ensaística e chegando à consolidação madura de suas abordagens. Espera-se com o artigo contribuir para os estudos em teoria da história, sobretudo com autores fora do eixo Europa-Estados Unidos.

Abstract The present article aims to discuss how kenian writer Ngugi Wa Thiong’o approaches history within three of his books: A grain of wheat, Decolonizing the mind and Memories in times of war. At first, an introduction is elaborated about how the author was studied in Brazil, going on to a discussion of how he developed his literary historiography in three moments ranging from writing in English, going through essay criticism and arriving at mature consolidation of its approaches. The article is expected to contribute to studies in the theory of history, especially with authors outside the Europe-United States circuit.

Dirt floors are used on most Brazilian poultry farms since the construction of concrete floors is very expensive. In vitro tests carried out to verify the effectiveness of disinfectants do not consider the adverse conditions found in poultry farms. Therefore, the present study aimed at evaluating the effect of six commercial disinfectants on the reduction of total and fecal coliforms on the dirt floor of breeder houses. The amount of disinfectant solution to be used per square meter was defined by counting total and fecal coliforms at different soil depths and by analyzing soil physical properties. Coliforms were detected at 0.5 cm, and one liter of disinfectant solution was sufficient for soil saturation at this depth. After that, the efficacy of six commercial products (caustic soda, hydrated lime, phenols 1 and 2, iodine, glutaraldehyde, and quaternary ammonium) in reducing the number of coliforms, after six hours of contact with the dirt floor, was assessed using the most probable number (MPN) method. Escherichia coli specimens isolated from the dirt floor were used to evaluate in vitro effectiveness of disinfectants. Products that yielded the best results in the MPN method were also effective in the in vitro tests. Among the tested disinfectants, hydrated lime was the most efficient, reducing the initial contamination by 2.9 log after six hours of contact with the dirt floor.