Local beer breweries in Burkina Faso absorb a considerable amount of urban woodfuel demand. We assess the woodfuel savings caused by the adoption of improved brewing stoves by these micro-breweries and estimate the implied welfare eff ects through the woodfuel market on private households as well as the environmental eff ect. We fi nd substantial wood savings among the breweries and, subsequent...

i=2:k ti(xi−x1) and now t2:k can be any real numbers. Hence, the affine hull of x1:k is a subspace of dimension k− 1, spanned by xi − x1, i = 2 : k, and shifted from the origin by the shift x1. Exercise: Show that the result is the same no matter which xi we chose in place of x1. In particular, the affine hull of two points is the line that passes through them, the affine hull of three points i...

Although an infection with Entamoeba histolytica is most commonly asympto-matic, the potential for invasive, metastatic disease, coupled with its high prevalence , makes amoebiasis a major health problem throughout much of the world. Most amoebiasis-related mortality stems from extra-intestinal infection. In these cases, trophozoites penetrate the epithelial layer and lamina propria of the bowe...

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