Faculty of Science & Technology (FST): Recent submissions
Now showing items 3061-3080 of 4284
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The chemotaxonomic significance of root anthraquinones and pre-anthraquinones in the genus Lomatophyllum (asphodelaceae)
(University of NairobiDepartment of Chemistry, Addis Ababa UniversityDepartment of Botany, Rand Afrikaans UniversityCollege of Biological and Physical Sciences,University of Nairobi, 1995-11)The roots of seven species of Lomatophyllum were analysed by TLC and HPLC for the presence of nine different anthraquinones and pre-anthraquinones which are all known to be characteristic constituents of the subterranean ... -
Comparative trypanotolerance of the small east African breed of goats from different localities to Trypanosoma congolense infection
(University of Nairobi.School of Biological Sciences, 1989-05)Differences in susceptibility of the Small East African breed of goats to an experimental Trypanosoma congolense infection were investigated. The goats were obtained from different areas of East Africa, Morogoro and Arusha ... -
On improved estimation under additional information
(Taylor & FrancisDepartment of Mathematics University of Nairobi, 1988)An improvement of the ordinary least squares estimator of the regression vector in a univariate linear model is obtained. This is done by combining observed data with prior information and other additional information. ... -
Mortality in adult tsetse, Glossina morsitans morsitans, caused by entomopathogenic bacteria
(University of Nairobi.School of Biological Sciences, 1989-07)Mortality in adult tsetse, Glossina morsitans morsitans, caused by Pseudomonas aeruginosa, Serratia marcescens, Bacillus sphaericus, Bacillus cereus, Bacillus thuringiensis H-14, B. thuringiensis 1, B. thuringiensis 5, B. ... -
A comparative study of anthraquinones in rhizomes of Kniphofia species
(University of NairobiDepartment of Chemistry, Addis Ababa UniversityCollege of Biological and Physical Sciences,University of Nairobi, 1988-01-14)The anthraquinone content of eight kniphofia species was compared using reversed phase HPLC method coupled with a photodiode array detector. -
A synthesis of enantiomerically enriched propargylsilanes
(Department of Chemistry, College of Biological and Physical Sciences, University of Nairobi, 1998) -
Predation of free-living engorged female Rhipicephalus appendiculatus
(University of Nairobi.School of Biological Sciences, 1991-10)In experiments done over a period of 1 1/2 years using engorged female Rhipicephalus appendiculatus tethered in a grass plot, 42% predation was observed in long grass (40-60 cm), and 36% in short grass (6-10 cm). Deaths ... -
Flavonoids from the seed pods of Tephrosia pumila
(University of NairobiDepartment of Chemistry, Addis Ababa UniversityPhytochemistry Research Laboratories, Department of Pharmacy (Pharm. Chem.), University of StrathclydeCollege of Biological and Physical Sciences,University of Nairobi, 1989)Inaddition to the known pumilaisoflavones A and B two further isoflavonoids have been isolated from the seed pods of Tephrosia pumila collected in Ethiopia. These have been characterized, on the basis of spectral analysis, ... -
Biomass fuel from chamomile waste flowers
(Department of Chemistry, College of Biological and Physical Sciences, University of Nairobi, 2005)The waste chamomile flowers from solvent extraction of fresh chamomile flowers. were compacted into cylindrical shapes with and without added binder (Calcium Sulphate), then carbonised using an electric oven to avoid ... -
Biocontrol potential of the entomogenous fungi Beauveria bassiana and Metarhizium anisopliae for tsetse flies (Glossina spp.) at developmental sites
(University of Nairobi.School of Biological Sciences, 1995-11)Spores of two entomogenous fungi, Beauveria bassiana and Metarhizium anisopliae, were mixed with sterile sand at two different concentrations (1.0 and 0.5 g/liter) and larvae of tsetse flies Glossina morsitans morsitans ... -
Three-stage group screening with errors in observations
(Taylor & Francis, 1985)This paper examines the performance of three-stage group screening in terms of the expected number of runs and the expected number of incorrect decisions. A few tables are given at the end to provide the reader with a ... -
A transition model for estimating academic survival through cohort analysis
(Taylor & FrancisDepartment of Mathematics University of Nairobi, 1986)To evolve an efficient system, educational activities need to be carefully coordinated, for which an abstract realization of the real system is essential. A transition model is one which describes the stocks and flows of ... -
C-methylated and C-prenylated isoflavonoids from root extract of Desmodium uncinatum
(University of NairobiDepartment of Chemistry, University of NairobiDepartment of Chemistry, Jomo Kenyatta University of Agriculture and TechnologyDepartment of Pharmacy and complementary/Alternative medicine, Kenyatta UniversityBiological Chemistry Division, Rothamsted Research, Harpenden,Herts A15 2JQ, UKInternational Centre of Insect Physiology and Ecology, 2007-03-05)A pterocarpan, 1,9-dihydroxy-3-methoxy-2-methylpterocarpan (named uncinacarpan) and two isoflavanones, 5,7-dihydroxy-2′,3′,4′-trimethoxy-6-(3-methylbut-2-enyl)isoflavanone (named uncinanone D) and 5,4′-dihydroxy-7,2′-dim ... -
Prospects for biological control of livestock ticks, Rhipicephalus appendiculatus and Amblyomma variegatum, using the entomogenous fungi Beauveria bassiana and Metarhizium anisopliae
(University of Nairobi.School of Biological Sciences, 1996-01)Both Beauveria bassiana and Metarhizium anisopliae induced approximately 30% mortalities in adult Rhipicephalus appendiculatus feeding on rabbits while M. anisopliae induced a mortality of 37% in adult Amblyomma variegatum. ... -
Expert System in Metal Cutting
(School of computing and informatics, University of Nairobi, 1998) -
Comparison of resistance in three breeds of cattle against African ixodid ticks.
(University of Nairobi.School of Biological Sciences, 1996-04)Tick resistance in three breeds of cattle, two indigenous breeds (Arssi and Boran) and one Boran x Friesian cross-bread, were compared following natural tick infestations at Abernossa ranch in Ethiopia. The local Arssi ... -
The performance of multistage group screening designs
(1986)This article deals with multistage group screening in which group-factors contain the same number of factors. A usual assumption of this procedure is that the directions of possible effects are known. In practice, however, ... -
Acquisition of resistance to the tick Amblyomma variegatum in Boran cattle, Bos indicus and the effects of Trypanosoma congolense and Babesia bigemina on host resistance
(University of Nairobi.School of Biological Sciences, 1996-04)Resistance was induced in cattle to the tick Amblyomma variegatum by five consecutive infestations with nymphs and adults. Using the principal component analysis (PCA), it was found that percentage of adults engorged, ... -
Combined Solvent Extraction
(Department of Chemistry, College of Biological and Physical Sciences, University of Nairobi, 2007) -
Simultaneous determination of iron(III) and vanadium(V) with N-phenylcinnamohydroxamic acid and thiocyanate by extraction-spectrophotometry
(University of NairobiCollege of Biological and Physical Sciences,University of NairobiDepartment of Chemistry, Addis Ababa University, 1985)N-Phenylcinnarnohydroxamic acid (PCHA) reacts with iron(III) and vanadium(V) in the presence of thiocyanate to form water-insoluble orange and green complexes, respectively. The iron(III)-PCHA and vanadium(V)-PCHA-thiocyanate ...
