Browsing by Author "Odongo, D."

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    Effect of Wood Ash as a Partial Replacement of Lime in the Stabilisation of Laterite Soil for Pavement Layers
    (Cape Town, 2019) Odongo, D.; Otyama, L.J.; Jjuuko, S.; Kalumba, D.
    This research considered the use of wood ash (WA) as a partial replacement of lime in stabilisation of laterite soil for pavement layers. The study investigated the physical properties and chemical composition of wood ash and laterite soil sample. The results showed that WA is a good pozzolan with combined SiO2, Al2O3 and Fe2O3 of 56.34% exceeding the minimum requirement of 50%. Laterite soil was categorised as Clayey Gravel with Sand, A-2-7(1), using the AASHTO classification system. The Initial Consumption of Lime of the soil sample, from the pH tests, was determined as 4%. The 4% lime content was gradually substituted with appropriate amounts of WA in proportions of 0%, 10%, 20%, 30%, 40% and 50% from which the geotechnical properties of the soil-lime-WA mixtures were investigated. The index and strength parameters of the laterite soil improved substantially. The results support the idea of making use of on-site materials and thus lowering construction costs. At the same time, the rapid fill-up rate of landfills would be solved.
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    The Rhipicephalus appendiculatus tick vector of Theileria parva is absent from cape buffalo (Syncerus caffer) populations and associated ecosystems in northern Uganda
    (Parasitology Research, 2020) Obara, I.; Githaka, N.; Nanteza, A.; Odongo, D.; Lubembe, D.; Atimnedi, P.; Mijele, D.; Owido, G.; Bishop, R. P.
    Rhipicephalus appendiculatus is the major tick vector of Theileria parva, an apicomplexan protozoan parasite that causes the most economically important and lethal disease of cattle in East and central Africa. The African cape buffalo (Syncerus caffer) is the major wildlife host of T. parva from southern Uganda and Kenya to southern Africa. We show herein that R. appendiculatus appears to be absent from the two largest national parks in northern Uganda. Syncerus caffer is common in both of these national parks, specifically Murchison falls (MFNP) and Kidepo Valley (KVNP). We re-confirmed the previously reported absence of T. parva in buffalo sampled in the two northern parks based on RLB data using a nested PCR based on the T. parva p104 gene. By contrast, T. parva-infected R. appendiculatus ticks and parasite-infected buffalo were present in Lake Mburo (LMNP) in South central Uganda. This suggests that the distribution of R. appendiculatus, which is predicted to include the higher rainfall regions of northern Uganda, may be limited by additional, as yet unknown factors.