Faculty of Science & Technology (FST): Recent submissions
Now showing items 3121-3140 of 4284
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Multielemental Analysis of Migori (Southwest, Kenya) Artisanal Gold Mine Ores and Sediments by EDX-ray Fluorescence Technique: Implications of Occupational Exposure and Environmental Impact
(College of Biological and Physical Sciences, University of Nairobi, 2011)The results of heavy element profiling of the gold ores and sediments associated with the artisanal gold mining activities of the Migori gold belt of Southwestern Nyanza, Kenya, were reported in this paper. The analysis ... -
The impact of Ixodiphagus hookeri, a tick parasitoid, on Ambl yomma variegatum (Acari: Ixodidae) in a field trial in Kenya
(Uniiversity of Nairobi.School of Biological Sciences, 1997-02-01)In an experiment to investigate the effect of the tick parasitoid, Ixodiphagus hookeri, on tick numbers on cattle, 150 000 parasitoids were released over a period of 1 year in a field where ten cattle infested with multiple ... -
Threshold change in forest understory vegetation as a result of selective fuelwood extraction in Nairobi, Kenya
(College of Physical and Biological Sciences, 2011)We examined whether heavy fuelwood collection can cause threshold change in understory forest community and evaluated how selective wood extraction might lead to delayed forest recovery in an urban forest of Nairobi, Kenya. ... -
Web service for the multilingual delivery of mathematical content
(University of NairobiCollege of biological and physical science, 2006) -
Chemotaxonomic survey of anthraquinones and pre-anthraquinones in roots of Aloe species
(University of NairobiCollege of Biological and Physical Sciences, 1995-04)Root samples from 172 species of Aloe were surveyed by TLC and HPLC for the presence of anthraquinones and pre-anthraquinones. With the exception of the three species of the series Serrulatae, 1,8-Dihydroxyanthraquinones ... -
Cellular And Humoral Defenses Of Glossina (diptera: Glossinidae): Reactions Against Bacteria, Trypanosomes, And Experimental Implants
(Uniiversity of Nairobi.School of Biological Sciences, 1986-01)Bacillus cereus was more pathogenic than Escherichia coli to Glossina morsitans morsitans (Diptera: Glossinidae) when injected into the hemocoel. Bacteria were phagocytosed by individual hemocytes, and small hemocyte clumps ... -
Thermostable Biocatalytic Films of Enzymes and Polylysine on Electrodes and Nanoparticles in Microemulsions
(American Chemical SocietyDepartment of Chemistry, University of Nairobi, Nairobi, 2008)Microemulsions of oil, water and surfactant were evaluated as media for biocatalysis at high temperatures employing films of polylysine (PLL) and the enzymes horseradish peroxidase (HRP), soybean peroxidase (SBP) and the ... -
Four isoflavones from the stem bark of erythrina sacleuxii
(University of NairobiDepartment of Chemistry, University of Nairobi, 1998-09-03)From the stem bark of Erythrina sacleuxii four new isoflavones were isolated and characterized as 5,7-dihydroxy-2′,4′,5′-trimethoxyisoflavone (trivial name, 7-demethylrobustigenin), 5,7-dihydroxy-4′-methoxy3′-(3-methylbu ... -
Tropane alkaloids from Erythroxylum emarginatum
(College of Physical and Biological Sciences, 2007)A tropane alkaloid, anhydroecgonine methyl ester N-oxide (2), was isolated for the first time as a naturally occurring compound, with anhydroecgonine methyl ester (1) from the bark of Erythroxylum emarginatum. Compound 1 ... -
Towards a Comprehensive, Machine-readable Dialectal Dictionary of Igbo
(University of NairobiCollege of biological and physical science, 2010)Availability of electronic resources, textual or otherwise, is a first step towards language technology research and development. This paper describes the acquisition and processing of a multi-dialectal speech and text ... -
Effects of combining the fungi Beauveria bassiana and Metarhiziumanisopliae on the mortality of the tick Amblyomma variegatum (ixodidae) in relation to seasonal changes
(University of Nairobi.School of Biological Sciences, 2005-06)The effect of formulation, fungal concentration, type and seasonal changes on the mortality of the tick Amblyomma variegatum was investigated. A previous study demonstrated high pathogenicity of strains of the fungi Beauveria ... -
Flavone C-glycosides of Phoradendron tomentosum from different host trees
(Elsevier, 1983)Apigenin, three known apigenin C-glycosides, vitexin, schaftoside and isoschaftoside together with apigenin 4′-O-glucoside have been identified in leaves of Phoradendron tomentosum growing on different hosts. -
Thermostable Peroxidase−Polylysine Films for Biocatalysis at 90 °C
(Department of Pharmacology, University of Connecticut Health Center, Farmington, ConnecticuDepartment of Chemistry, University of Nairobi, NairobiDepartment of Chemistry and Institute of Materials Science, 55 North Eagleville Road, University of Connecticut, Storrs, Connecticut 06269, 2007)ross-linked films of poly(l-lysine) (PLL) and enzymes covalently linked to surfaces provided remarkable thermostability, enabling biocatalysis at 90 °C. Soret spectra, circular dichroism, and voltammetry showed that PLL ... -
Experimental infections of the tick Rhipicephalus appendiculatus with entomopathogenic fungi, Beauveria bassiana and Metarhizium anisopliae, and natural infections of some ticks with bacteria and fungi
(University of Nairobi.school of biological sciences, 1995-09)Two strains of the entomogenous fungus, Beauveria bassiana, were found to be pathogenic to all stages of the tick Rhipicephalus appendiculatus in the laboratory. A mortality of up to 73 percent of unfed adults was recorded, ... -
Chromadoridae (Chromadorida: Nematoda) from the Indian Ocean: Difficulties in morphological identification of Actinonema Cobb, 1920 and Rhips Cobb, 1920.
(Universityof Ghent,DepartmentofMorphology,Systematics&Ecology,MarineBiologySection,, 1997)The diagnostic characteristics of ActinonemaCobb, 1920 and Rhips Cobb, 1920 are reviewed andtheir importance for genera diagnosis assessed. Threespecies of Actinonema and one species of Rhips are described. Actinonema ... -
HPCL Separation and Quantitative Determination of Valepotriates from Valeriana kilimandascharica
(Department of botany, University of Nairobi, 1981)Valepotriates, mainly isovaltrate and valtrate, have been separated and quantitatively estimated by reversed-phase HPLC in the leaves, flowers, stems and rhizomes of Valeriana kilimandascharica. The isovaltrate/valtrate ... -
Horizontal transmission of mycotic infection in adult tsetse,Glossina morsitans morsitans
(University of Nairobi.school of biological sciences, 1990)AdultGlossina morsitans morsitans exposed to wet conidia ofBeauveria bassiana andMetarhizium anisopliae suffered high mortalities ranging from 90 to 100% by 2 weeks post-exposure. Infected ♂ ♂ maintained in the same cages ... -
Ecdysteroids as regulators of host and parasite interactions: a study of interrelationships between Schistosoma mansoni and the host snail, Biomphalaria glabrata.
(1991)Ecdysteroids have been detected in trematode parasites and in several species of gastropod snails. The potential role of these and other hormones as regulators of host/parasite interactions is discussed. This study considers ... -
Laboratory and Field Evaluation of Entomogenous Fungi for Tick Control
(University of Nairobi.school of biological sciences, 2000-12)Aqueous and oil-based formulations of two entomogenous fungi, Beauveria bassiana and Metarhizium anisopliæ were tested for their efficacy against the three major species of African ticks; namely, Amblyomma variegatum, ... -
Comparative study of hemocytes and associated cells of some medically important dipterans
(University of Nairobi., 1982-09)The aim of this work is to study, characterize, and compare different morphological types of hemocytes of Glossina austeni, G. morsitans, Calliphora erythrocephala, Stomoxys calcitrans, Lucilia sericata, Aedes aegypti, and ...
