Faculty of Science & Technology (FST): Recent submissions
Now showing items 3081-3100 of 4283
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Three-stage group screening with unequal group sizes and with errors in observations
(1987)In this paper three-stage group screening in which group-factors contain differing number of factors is discussed. A procedure for grouping the factors in the absence of concrete prior information is described. Formulas ... -
Effect of root rot pathogens and fungicide seed treatment on nodulation and biomass accumulation
(University of NairobiCollege of biological and physical science, 2007) -
The potential for antitick plants as components of an integrated tick control strategy
(University of Nairobi.School of Biological Sciences, 2000)Extracts from various African plants have been shown to possess strong acaricidal and/or tick repellent properties. Some of the plant extracts are capable of reducing tick feeding, molting, fecundity, and viability of eggs. ... -
Attraction of Amblyomma variegatum (ticks) to the attraction-aggregation-attachment-pheromone with or without carbon dioxide
(University of Nairobi.School of Biological Sciences, 2003)The responses of adult Amblyomma variegatum ticks released from various distances to different doses of the synthetic attraction-aggregation-attachment pheromone (AAAP) (made up of orthonitrophenol, methyl salicylate and ... -
Performance of a prototype baited-trap in attracting and infecting the tick Amblyomma variegatum (Acari: Ixodidae) in field experiments
(University of Nairobi.School of Biological Sciences, 2006)Investigations were commenced to study the potential use of the fungi, Beauveria bassiana, Metarhizium anisopliae, and the attraction-aggregation-attachment pheromone (AAAP) for the control of Ambloyomma variegatum as an ... -
Protection of Metarhizium anisopliae conidia from ultra-violet radiation and their pathogenicity to Rhipicephalus evertsi evertsi ticks
(University of Nairobi.School of Biological Sciences, 2008-12)Metarhizium anisopliae conidia were formulated in water or in olive oil containing 3% commercial sunscreens (Everysun or E45 Sun Block 50) and exposed to an artificial UV source for up to 5 hours. Survival of conidia after ... -
Control of tick populations by spraying Metarhizium anisopliae conidia on cattle under field conditions
(University of Nairobi.School of Biological Sciences, 2011-11)Conidia of the entomopathogenic fungus, Metarhizium anisopliae, in oil/water formulation (1 × 10(8) conidia/ml) were sprayed at 3 weekly intervals on Rhipicephalus evertsi evertsi and Rhipicephalus (Boophilus) decoloratus ... -
Mortalities induced by entomopathogenic fungus
(University of Nairobi.School of Biological Sciences, 2011-05)The objective of this study was to compare the infectivity of Metarhizium anisopliae at a concentration of 1 × 108 conidia/ml to developmental stages of Amblyomma variegatum, Rhipicephalus appendiculatus and Rhipicephalus ... -
Laboratory Evaluation of Pathogenicity of Entomogenous Nematodes to African Tick Species
(University of Nairobi.School of Biological Sciences, 2000)Five strains of entomogenous nematodes, Steinernema carpocapsæ strains DD, Mexican, SR, and Heterorhabditis bacteriophora strains 1S5 and HP88, were tested for their pathogenicity to various developmental stages of five ... -
An expert system developed to assist digital electronics teaching
(College of Physical and Biological Sciences, 1998)Expert systems are computer programs designed to model the problem-solving ability of human experts. They have experienced tremendous growth and popularity since their commercial introduction in the early 1980s. Expert ... -
The reproductive biology of Thalamita crenata (Latreille) at Gazi Bay in Kenya
(College of Biological and Physical Sciences, University of Nairobi, 1999)The brachyuran crab Thalamita crenata (Latreille) occurring intertidally along the Kenyan coast was sampled at Gazi over a period of 12 months. The crabs were collected using scoopnets over a distance covering two kilometres ... -
Automatic Word Sense Disambiguation of Kiswahili Nouns
(University of NairobiCollege of biological and physical science, 2003) -
Antipyretic and analgesic studies of the ethanalic extract of Teclea nobilis delile
(University of NairobiDepartment of Experimental Pharmacology, University of NaplesDepartment of Chemistry, Addis Ababa UniversityCollege of Biological and Physical Sciences,University of Nairobi, 1998)The crude ethanol extract of the leaves of an African medicinal plant Teclea nobilis has been studied for its antipyretic, analgesic and anti-inflammatory activities. The extract exhibited marked antipyretic and analgesic ... -
The effects of Trypanosoma congolense infection on the testis and epididymis of the goat
(Uniiversity of Nairobi.School of Biological Sciences, 1980-03)Five male non-castrated goats were each injected with 2 ml of blood from an infected goat containing about 0.75 million T. congolense/ml. Two goats died 4 weeks after infection; the remainder and five controls were killed ... -
Semantic analysis of Kiswahili words using the Self-Organizing Map
(University of NairobiCollege of biological and physical science, 2003)Acquisition of semantic knowledge to support natural language processing tasks is a nontrivial task, and more so if manually undertaken. This paper presents an automatic lexical acquisition method that learns semantic ... -
Interpretation of small-modulation photocurrent transients in dye-sensitized solar cells – A film thickness study
(Department of Physics, College of Biological and Physical sciences, University of Nairobi, 2010)Electron transport in dye-sensitized solar cells with varying mesoporous TiO2 film thicknesses was investigated using experimental and computational methods. More specifically, photocurrent transients resulting from ... -
Acaricidal activity of Margaritaria discoidea (Euphorbiaceae) plant extracts against the ticks Rhipicephalus appendiculatus and Amblyomma variegatum (Ixodidae)
(Uniiversity of Nairobi.School of Biological Sciences, 1995)A water soluble extract of M. discoidea, an African indigenous plant induced high mortalities in nymphs of both Rhipicephalus appendiculatus, and Amblyomma variegatum and in adult R. appendiculatus, but not in adult A. ... -
Towards Machine Translation of African Languages: Requirements, Challenges and Achievements
(University of NairobiCollege of biological and physical science, 2004) -
Anthraquinones and chemotaxonomy of the asphodelaceae
(University of NairobiDepartment of Chemistry, Addis Ababa UniversityCollege of Biological and Physical Sciences,University of Nairobi, 1994)Phytochemical investigations on three genera of the Asphodelaceae, Aloe, KniphoJla and Bulbine showed that 1-methyl-8-hydroxyanthraquinones and anthrone-C-glycosides are characteristic constituents of the genus Aloe, ... -
Susceptibility of different breeds of goats in Kenya to experimental infection withTrypanosoma congolense
(Uniiversity of Nairobi.School of Biological Sciences, 1985)To assess whether there was any evidence of genetic resistance to African trypanosomiasis, five breeds of goat (East African, Galla, and crossbreds between East African and Galla, Nubian or Toggenburg) were experimentally ...