Faculty of Science & Technology (FST): Recent submissions
Now showing items 3021-3040 of 4283
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Parasitism of Amblyomma variegatum by a Hymenopteran Parasitoid in the Laboratory, and Some Aspects of Its Basic Biology
(University of Nairobi.School of Biological Sciences, 1994-06)Unfed Amblyomma variegatum F. nymphs were experimentally infected in the laboratory with a hymenopteran parasitoid, Ixodiphagus hookeri (Howard). The parasitoid was originally obtained from ticks collected from cattle in ... -
Achieving sustainable food production in Africa: Roles of pesticides and biological control agents in integrated pest management
(University of Nairobi.School of Biological Sciences, 1994-04)Food production in Africa is declining, while her population is increasing rapidly. Some factors responsible for low food productivity are mentioned; special attention is given to the problem of agricultural pests. The ... -
Microorganisms associated with tsetse in nature: Preliminary results on isolation, identification and pathogenicity
(University of Nairobi.School of Biological Sciences, 1990-06)Six genera of bacteria: Serratia, Providencia, Enterobacter, Aeromonas, Cedecea and Bacillus were isolated from field-collected G. pallidipes. Four genera: Serratia, Providencia, Enterobacter and Aeromonas were isolated ... -
Fecundity and survival of tsetse maintained on immunized rabbits
(University of Nairobi.Department of Biochemistry, 1982-09)Female Glossina morsitans morsitans maintained on rabbits previously immunized with whole tsetse body (WTB), engorged tsetse guts (ETG) or gravid tsetse uteri (GTU) for three successive generations showed no increase in ... -
Non-square quantum well growth for reduced threshold current in tensilely strained lasers operating at 1.52m
(AJOLDepartment of Physics, University of Nairobi, 2001)This paper presents calculations demonstrating that non-square quantum well growth (well shaping) can result in reduced threshold current for tensilely strained quantum well bipolar diode lasers operating at 1.52ìm m. ... -
Insect immunity: Induction of cecropin and attacin-like antibacterial factors in the haemolymph of Glossina morsitans morsitans
(University of Nairobi.School of Biological Sciences, 1987)Injections of live Escherichia coli into adult tsetse flies, Glossina morsitans morsitans induced an antibacterial activity in the haemolymph after a lag period of 6–18 hr. Peak activity occurred after 24–72 hr with a dose ... -
Bovine granulocyte/macrophage and erythroid colony culture: characteristics of the colonies and the assay systems
(University of Nairobi.School of Biological Sciences, 1979-10)Bovine bone marrow granulocyte/macrophage colonies were cultured in vitro in methyl cellulose and in plasma clots using bovine endotoxin-stimulated serum as a source of colony stimulating activity. The endotoxin-stimulated ... -
Reduced Threshold Current in Bipolar Diode Lasers by Non-square Quantum Well Growth
(IOP SCIENCE, 2003)By device simulation, it is shown that non-square quantum well growth (well shaping) provides a means for reducing the threshold current of bipolar quantum well diode lasers. Calculations of subband structure, optical ... -
Plant disease data in planning for sustainable use of African mountain forest resources: Problems and opportunities.
(University of NairobiCollege of biological and physical science, 1998) -
Inhibition of bovine bone marrow granulocyte/macrophage colony formation in vitro by serum collected from cattle infected with Trypanosoma vivax or Trypanosoma congolense
(University of Nairobi.School of Biological Sciences, 1979-06)Serum collected from cattle infected with Trypanosoma vivax or Trypanosoma congolense inhibited bovine granulocyte/macrophage colony formation in methyl cellulose cultures. Maximum inhibition was caused by serum collected ... -
Medicinal plants: Their role and future
(University of NairobiCollege of biological and physical science, 2000)No Abstract -
Bovine erythrocytic, granulocytic and macrophage colony formation in culture. A preliminary report
(University of NaitrobiSchool of Biological Sciences, 1978-07)Bovine erythrocytic colonies containing up to 300 cells each were produced by using a plasma clot technique with five percent CO2 at 37 degrees C. with high humidity and 2.5 units of sheep step III erythropoietin per ... -
Inhibition of leukopoiesis by sera from Trypanosoma congolense infected calves: partial characterization of the inhibitory factor
(University of Nairobi.School of Biological Sciences, 1980-06)Sera collected from calves infected with Trypanosoma congolense inhibited bovine granulocyte/macrophage colony formation in vitro, but not erythroid colony formation. The inhibitor was found to be TCA precipitable in nature ... -
Two new species of Plectranthus L
(University of NairobiCollege of biological and physical science, 2000)Vegetative propagation studies were carried out at Maseno University, Kenya in the year 2004 and 2005 using stem cuttings on three endangered indigenous tree species namely Asystasia schimperi, Carissa edulis and Toddalia ... -
The kinetics of haemopoietic differentiation assessed by in vitro bone marrow culture in endotoxin-treated and in anaemic calves
(University of Nairobi.School of Biological Sciences, 1980-07)Marrow aspirates from calves injected with Pseudomonas aeruginosa endotoxin showed an increased number of granulocyte/macrophage progenitor cells, and a reduced number of erythroid progenitor cells. On the other hand, ... -
Envelope Function Approximation (EFA) Bandstructure Calculations for III-V Non-square Stepped Alloy Quantum Wells Incorporating Ultra-narrow (~5Å) Epitaxial Layers
(2000)We describe Envelope Function Approximation (EFA) bandstructure calculations based on a 4-band electron (EL), heavy-hole (HH), light-hole (LH) and split-off hole (SO) effective mass Hamiltonian, with Burt-Foreman ... -
Cryopreservation of bovine hemopoietic progenitor cells in liquid nitrogen
(University of Nairobi.School of Biological Sciences, 1981-04)Bovine marrow granulocyte/macrophage and erythroid progenitor cells maintained viability after storage in liquid nitrogen for 2 to 4 weeks. The granulocyte/macrophage progenitor cells maintained 100% viability for 4 weeks, ... -
Kenyan aromatic plants with a potential for economic utilization. First National Workshop On Medicinal, Aromatic and Other Under-utilised Plant Species in Kenya, 29th October- 3rd November, 2001
(University of Nairobicollege of biological and physical science, 2001)No Abstract -
Photoactive iron pyrite films for photoelectrochemical (PEC) cells Renewable Energy
(Department of Physics, University of Nairobi., 2000)No Abstract -
Characteristics of erythroid colonies formed by bovine marrow progenitor cells in methyl cellulose cultures
(University of Nairobi.School of Biological Sciences, 1982-03)Bovine erythroid colonies containing eight to 100 erythroid cells were successfully cultured in methyl cellulose. The colonies required four to five days to mature and a direct linear relationship (r = 0.99) between the ...