Faculty of Science & Technology (FST): Recent submissions
Now showing items 3181-3200 of 4284
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Changes in plant growth, nutrient dynamics and accumulation of flavonoids and anthocyanins by manipulating the cropping systems involving legumes and cereals- a review
(Department of botany, University of Nairobi, 2011)Improved crop production is very important in Africa, especially in such time when food required exceeds food produced. However, improved yield is constrained by a number of biophysical factors including poor planting ... -
Four isoflavones from seed pods of Millettia dura
(University of NairobiCollege of Biological and Physical Sciences, 1996-02)Seed pods of Millettia dura yielded four novel isoflavones, which have been characterized as 3-(3,4-dimethoxyphenyl)-6-methoxy-8,8-dimethyl-4H,8H-benzo[1,2-b: 3,4-b′]dipyran-4-one (trivial name, durallone), 6-demethyldurallone, ... -
Knipholone anthrone from Kniphofia foliosa
(University of NairobiCollege of Biological and Physical Sciences, 1993-11)A new anthrone named knipholone anthrone was isolated from the stem of Kniphofia foliosa. Its structure was determined by spectral analysis as well as conversion to knipholone. -
An anthrone, an anthraquinone and two oxanthrones from Kniphofia foliosa
(University of NairobiCollege of Biological and Physical Sciences, 1994)The compounds isoknipholone, isoknipholone anthrone, foliosone and isofoliosone were isolated from the stem of Kniphofia foliosa and their structures determined by spectral analyses. In addition, the known compounds, ... -
neo-Clerodane diterpenoids from the leaf exudate of Dodonaea angustifolia
(University o nairobiCollege of biological and physical science, 2010)Phytochemical investigation of the leaf surface exudate of Dodonaea angustifolia L.f. yielded two new neo-clerodane diterpenes, neo-clerodan-3,13-dien-16,15:18,19-diolide (mkapwanin) and 15-methoxy-neo-clerodan-3,13-dien ... -
Diurnal course of light interception by a groundnut crop grown in association with maize
(SpringerDepartment of botany, University of Nairobi, 1985)Maize and groundnut crops were grown in pure and mixed cultures in adjacent plots in the FTC farm at Homabay, Kenya. Measurements of diurnal light interception, leaf diffusive resistances (r1), water potential and leaf ... -
Rotenoids, isoflavones and chalcones from the stem bark of Millettia usaramensis subspecies usaramensis
(University of NairobiDepartment of Chemistry, University of Nairobi, 1998-01)From the stem bark of Millettia usaramensis subsp. usaramensis four new 12a-hydroxyrotenoids with the unusual trans B/C ring junction ((+)-12a-epimillettosin, (+)-usararotenoid-A, (+)-12-dihydrousararotenoid-A, and ... -
Hormonal sex reversal in Oreochronis niloticus (L.) using 17-?-Ethynyltestosterone and 17-?-Methyltestosterone
(School of Biological Sciences, 1997) -
Investigation of some medicinal plants traditionally used for treatment of malaria in Kenya as potential sources of antimalarial drugs.
(University of NairobiCollege of biological and physical science, 2011-03)Malaria is a major public health problem in many tropical and subtropical countries and the burden of this disease is getting worse, mainly due to the increasing resistance of Plasmodium falciparum against the widely ... -
Three isoflav-3-enes and a 2-arylbenzofuran from the root bark of Erythrina burttii
(University of NairobiDepartment of Chemistry, University of Nairobi, 2002-02)From the root bark of Erythrina burttii three isoflav-3-enes, 7,4′-dihydroxy-2′-methoxy-6-(1″,1″-dimethylallyl)isoflav-3-ene (trivial name, burttinol-A), 4′-hydroxy-2′-methoxy-2″,2″-dimethylpyrano[5″,6″:8,7]isoflav-3-ene ... -
Four isoflavanones from the stem bark of Platycelphium voense
(University of Nairobicollege of biological and physical science, 2012)From the stem bark of Platycelphium voënse (Leguminosae) four new isoflavanones were isolated and characterized as (S)-5,7-dihydroxy-2′,4′-dimethoxy-3′-(3″-methylbut-2″-enyl)-isoflavanone (trivial name platyisoflavanone ... -
Antiplasmodial activity of compounds from the surface exudates of Senecio roseiflorus
(University of Nairobicbps, 2013-02)From the surface exudates of Senecio roseiflorus fourteen known methylated flavonoids and one phenol were isolated and characterized. The structures of these compounds were determined on the basis of their spectroscopic ... -
Nature of dormancy in seeds of Sesamum latifolium (Gillet
(Department of botany, University of Nairobi, 2010)Sesamum latifolium is a progenitor of the cultivated Sesamum indicum. The plant has medicinal value, is used as forage, and is a potential donor of genes for crop improvement. The seeds of this species do not germinate ... -
An optimal approach for generation of time delay algorithms for anti-air missiles
(School of Biological and Physical Sciences, University of Nairobi, 2001)This paper sets out a new approach for generating time before detonation in anti-air missiles equipped with proximity fuses. Conventional algorithms for determining these delay times rely on human effort, knowledge and ... -
A lithostratigraphic framework for the Migori segment of the Archean Nyanza greenstone belt, Tanzanian Craton, East Africa
(university of Nairobicbps, 1992) -
Proposal for the formation of a working group to revise the stratigraphic nomenclature applied to the Archaean terrane of western Kenya.
(University of NairobiCollege of biological and physical science, 1993) -
Phase relations in the Cu 2S-S-FeS-ZnS and Cu2S-PbS-ZnS Ternary - Systems at 1473K: Extraction of zinc from sulfide ore using liquid copper as a reagent. In:
(University of NairobiCollege of biological and physical science, 1995) -
Flavonoids and Isoflavonoids with Antiplasmodial Activities from the Root Bark of Erythrina abyssinica
(University of NairobiDepartment of Chemistry, University of Nairobi, 2003-07)From the root bark of Erythrina abyssinica a new pterocarpene [3-hydroxy-9-methoxy-10-(3,3-dimethylallyl)pterocarpene] and a new isoflav-3-ene [7,4′-dihydroxy-2′,5′-dimethoxyisoflav-3-ene] were isolated. In addition, the ... -
Effect of rotenoids from the seeds of Millettia dura on larvae of Aedes aegypti
(University of NairobiDepartment of Chemistry, University of Nairobi, 2003-10)A crude chloroform extract of seeds of Millettia dura Dunn (Leguminosae) showed high activity (LC50 = 3.5 µg ml−1 at 24 h) against second-instar larvae of the mosquito, Aedes aegypti L (Diptera: Culicidae). The rotenoids, ...
