Faculty of Science & Technology (FST): Recent submissions

Now showing items 4021-4040 of 4283

    • Using Nylon Strips to Dispense Mosquito Attractants for Sampling the Malaria Vector Anopheles gambiae s.s. 

      Okumu, F.; Biswaro, L; Mbeleyela, E; Killeen, G. F; Mukabana, W. R; Moore, S. J (Entomological Society of AmericaDepartment of Zoology, University of Nairobi, Nairobi, KenyLondon School of Hygiene and Tropical MedicineDurham University, School of Biological Sciences, South Road, Durham, United KingdomLiverpool School of Tropical Medicine, Pembroke Place, Liverpool, L3 5QA, United Kingdom, 2010)
      Synthetic versions of human derived kairomones can be used as baits when trapping host seeking mosquitoes. The effectiveness of these lures depends not only on their attractiveness to the mosquitoes but also on the medium ...

    • A Simple Method for Sampling Indoor-Resting Malaria Mosquitoes Anopheles gambiae and Anopheles funestus (Diptera: Culicidae) in Africa 

      Harbison, JE; Mathenge, EM; Misiani, GO; Mukabana, WR; Day, JF (Entomological Society of AmericaDepartment of Zoology, University of Nairobi, Nairobi, Keny, 2006)
      Sampling indoor resting African malaria vectors is traditionally done by hand catches with oral or mechanical aspirators and pyrethrum spray catches (PSCs). In this study, we designed and brießy evaluated an inexpensive ...

    • Indigenous Snake Bite Remedies of the Luo of Western Kenya 

      Owuor, BO.; Mulemi, BA.; Kokwaro, JO. (Society of EthnobiologyCatholic University of Eastern AfricaUniversity of Nairobi, Kenya, 2005)
      Medicinal plants have been overtaken in the treatment of snake bites by serum therapy and are rarely considered efficacious remedies in biomedicine. Nevertheless, rural inhabitants rely on plant medical material and the ...

    • Bathymetry of lake Bogoria, Kenya 

      Hickley, Phil; Boar, Rosalind R; Mavuti, Kenneth M (Nature Kenya/East African Natural History SocietyDepartment of Zoology, University of Nairobi, Nairobi, KenyaCentre for Ecology, Evolution and Conservation (CEEC), Environmental Sciences, University of East Anglia, NorwichEnvironment Agency, Arthur Drive, Hoo Farm Industrial Estate, Worcester Road, 2003)
      This paper presents the first bathymetric map for the approximately 17 km by 2 km alkaline Lake Bogoria situated in the eastern Rift Valley of Kenya. Longitudinal and transverse cross sections of the lake are also ...

    • Decision support in breeding program in the Kenya Dairy cattle Prediction and Rule extraction using Neural Network System 

      Njubi, David M (School of Computing and Informatics, 2008)
      An important characteristic of all natural systems is the ability to acquire knowledge through experience and to adapt to new situations. This report presents findings on the use of neural networks to make predictions ...

    • Evaluation of Herbs as Potential Drugs/Medicines 

      Odhiambo, JA; Lukhoba, CW; Dossaji, SF (School of Biological Sciences, 2011)
      Herbal drugs have been used since ancient times as medicines for the treatment of a wide range of diseases, for both human and livestock. A study conducted in the Lake Victoria Basin Kenya revealed vast knowledge and ...

    • Behavioural response of the malaria vector Anopheles gambiae to host plant volatiles and synthetic blends 

      Nyasembe, VO; Teal, PEA; Mukabana, WR; Tumlinson, JH; Torto, B (School of Biological Sciences, 2012)
      Background Sugar feeding is critical for survival of malaria vectors and, although discriminative plant feeding previously has been shown to occur in Anopheles gambiae s.s., little is known about the cues mediating ...

    • The Paleoecology and Paleogeographic context of Lemudongo locality 1, a late Miocene terrestrial fossil site in southern Kenya 

      Nyamai, C.M. (Department of Geology, University of Nairobi, 2007)
      The Lemudongo Formation in the Narok District of Kenya comprises a 135-mthick series of predominantly lacustrine and lake basin margin sedimentary rocks with interstratified primary and reworked tuffs. The formation, ...

    • Terpurinflavone: An antiplasmodial flavone from the stem of Tephrosia Purpurea 

      Heydenreich, Matthias; Muiva, Lois M.; Eyase, Fredrick L.; Akala, Hoseah M.; Wanyama, P. Juma; Yenesew, Abiy; Imbuga, Mabel; Walsh, Douglas S.; Peter, Martin G.; Gitu, Peter M.; Okalebo, Faith A. (Elsevier B.V.Department of Chemistry,University of NairobiUnited Stares Army Medical Research Unit-KenyaDepartment of Biochemistry, Jomo Kenyatta University of Agriculeure and TechnologyInsrieur fur Chemie, Universitat Potsdam,School of Pharmacy, University of Nairobi,, 2011)
      The stem extract of Tephrosia purpurea showed anti plasmodial activity against the D6 (chloroquinesensitive) and W2 (chloroquine-resistant) strains of Plasmodium /aldparum with 1(50 values of 10.47 ± 2.22 f.Lg/mland 12.06 ...

    • Soil Abiotic and Biotic Interactions and Impact on the Ecosystem and Hutnan Welfare 

      Onyatta, J.D.; Huang, P.M. (Science Publishers, Inc.Dept. Soil Science, University of Saskatchewan,, 2005)
      Phosphate fertilizers are applied to correct phosphorus deficiency in acidic tropical soils of variable charge, which account for a large proportion of the world's arable land. They are commonly applied in bands or mixed ...

    • Thermal fatigue behaviour of a Kenyan kaolinite clay 

      Kimani, J.N; Aduda, Bernard O (1999)
      The thermal fatigue resistance for a Kaolinite clay-based refractory used for then1lfl1 insulation in local (Kenyan) firewood cooking stoves has been studied by subjecting them to a water quench to predict their values ...

    • Solar cell with Pb(OH)xSy extremely thin absorber (eta) based on novel eta concept 

      Musembi Robinson .J.; Adud Bernard O.; Mwabora J.M; Bayon, R. (Department of Physics, School of Physical Sciences, University of Nairobi, 2008)
      A new highly structured In(OH)xSy/Pb(OH)xSy/PEDOT: PSS solar cell has been developed based on the novel eta concept, and characterized by photovoltage spectroscopy, X-ray photoelectron spectroscopy, scanning electron ...

    • The Effect of Quartz and Mullite Phases on Strength of Triaxial Porcelain 

      Nyongesa, FW; Aduda, BO (Department of Physics, University of Nairobi, 2004)
      The Effect of quartz and mullite crystalline phases on the strength of triaxial porcelain in the system quartz-feldspar-kaolin composed of20% wt silica and feldspar/kaolin ratio of 5:8 have been investigated. It was found ...

    • Effect of silica additions on strength and elastic modulus of Kenyan industrial clay ceramics 

      Nyongesa, FW; Aduda, BO (Department of Physics, University of Nairobi, 2000)
      The effect of silica additions on material properties of Kenyan industrial clay ceramics composed of 0- 50% wt silica and a feldspar-kaolin content ratio in the range 1:1 to 5:8 was investigated. Highest sintered density ...

    • Effect of crystalline phases on the strength of (quartz-feldspar-kaolin ) porcelain 

      Nyongesa, FW; Aduda, BO (Department of Physics, University of Nairobi,, 2000)
      The effect of mullite and quartz phases on the strength of Kenyan tri-axial porcelain in the system Quartz-feldspar-kaolin has been investigated. It was found that both the compressive and tensile strengths of porcelain ...

    • Thermal cycling behaviour in Kenyan kaolinite thermal insulators 

      Kimani, J.N; Aduda, Bernard O (Department of Physics, University of Nairobi, 2000)
      The thermal shock and thermal fatigue behaviour of a Kenyan kaolinite clay used in firewood jikos and in kiln linings has been studied. The thermal shock R parameters have been measured for the material. Also measured ...

    • Potential antitermite compounds from Juniperus procera extracts 

      Kinyanjui, T; Gitu, Peter M; Kamau, Geoffrey N (Department of Chemistry, University of Nairobi, 2000-10)
      Thin layer chromatography (TLC) analysis revealed that destructive distillation of Juniperus procera tree gave .en major components, whereas Croton megalocarpus tree yielded five components. This was confirmed by gas ...

    • Rice Husk Ash and its Application as a Cement Replacement Material in Kenya 

      Kaman, G.N; Mbindyo, J. K.N; Githinji, Z. P; Tuts, R. J. R; Kinyua, A.M (1993)
      AAS and XRD amdysls of rice husk ash (RHA) from Mwea and Ahero regions in Kenya, and physical tests of the strength of cernenl;itious materials obtained when the ash is used to replace ordinary portland cement (OPe) are ...

    • Analysis of Root Mean Square Roughness of Microcrystalline Silicon Thin Films Using Scanning Probe Image Processor software 

      Nyangonda, TN; Mulati, DM; Aduda, BO (University of Nairobi, Physics Department,Jomo Kenyatta University of Agriculture and Technology, Physics Department, 2012)
      Electron transport and recombination has been investigated in dye-sensitized electrochemical solar cells at varying Ti02 film thickness using experimental electrochemical potential technique. Photocurrent transients ...

    • Fracture strength of porous ceramics: stress concentration vs minimum solid area models 

      Nyongesa, F. W.; Aduda, Bernard O (Department of Physics, University of Nairobi, 2004)
      In this study, we have reviewed recently published strength-porosity data of porous ceramics, and compared these data with those computed from both the minimum contact solid area (MCA) and the pore stress concentration ...