Browsing Faculty of Science & Technology (FST) by Title
Now showing items 4060-4079 of 4283
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Triblock copolymers of lactide with poly(ethylene glycol) and influence of stereochemical composition
(2003)Polymerization of L-lactide (LLA) and poly(ethylene glycol) (PEG) at 120°C using stannous 2-ethyl hexanoate results in ABA triblock copolymers in good yields. The glass transition temperature of the copolymers shows strong ... -
Trichodermadiene: a new trichothecene
(Department of Chemistry, 1980)A new trichothecene, trichodermadiene possessing a dienic ester side chain has been isolated and characterized. -
Tris(2-pyridyl)phosphine oxide: how C-H.O and C-H.N interactions can affect crystal packing efficiency.
(Department of Chemistry, 2004-04)Tris(2-pyridyl)phosphine oxide, (I), C(15)H(12)N(3)OP, is isomorphous with tris(2-pyridyl)phosphine. Because of a combination of C-H.O and C-H.N interactions, the crystal packing is denser in the title compound than in the ... -
Triterpene saponins of Maesa lanceolata leaves
(Department of Chemistry, 2011)Chemical investigation of Maesa lanceolata leaves aqueous MeOH extract has led to the isolation of eight new triterpene glycosides identified as 16-oxo-28-hydroxyolean-12-ene 3- O - β -glucopyranosyl-(1'' → 6') ... -
Triterpenoids and Steroids of Myrsine africana Leaves
(College of Physical and Biological Sciences, 2006) -
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 ... -
Trophic Ecology of Sardinella gibbosa (Pisces: Clupeidae) and Atherinomorous lacunosus (Pisces: Atherinidae) in Mtwapa Creek and Wasini Channel, Kenya
(Western Indian Ocean Marine Science Association, 2002)The food habits of two schooling planktivorous fishes, Sardinella gibbosa and Atherinomorous lacunosus, were investigated in Mtwapa creek and Wasini Channel of the Kenya coast. Spatial and temporal variations in their food ... -
Trophic Ecology of Some Common Juvenile Fish Species in Mtwapa Creek, Kenya
(AJOL, 2004)The trophic status of common fish species in Mtwapa creek on the Kenyan coast was studied. Both the qualitative and quantitative spectra of the diets of these fish species were investigated. It was found that the eight ... -
Tropical freshwater ecotones: their formation, functions and use
(Khuwer Academic Publishers.Fisheries Resources Research Institute,, 2001)Tropical water-terrestrial ecotones play important roles in regulating the flow of materials from and to land and water ecosystems. Ecotones exist where active interactions between two or more adjacent ecosystems occur ... -
The tropical lapse rate steepened during the last glacial maximum.
(Unuversity of Nairobi, 2017)The gradient of air temperature with elevation (the temperature lapse rate) in the tropics is predicted to become less steep during the coming century as surface temperature rises, enhancing the threat of warming in ... -
Tropical rainforest tree species with Agroforesty potential.
(University of NairobiCollege of biological and physical science, 1989) -
Trust and Distrust: A Reputation Ratings Approach
(2016)Agents’ reputation ratings in a social network form a real valued matrix which is discounted with singular value decomposition (SVD) to estimate the trust and distrust levels of agents. SVD eliminates noise as future ... -
Trust Model For Social Network Using Singular Value Decomposition
(University of Nairobi, 2016)For effective interactions to take place in a social network, trust is important. We model trust of agents using the peer to peer reputation ratings in the network that forms a real valued matrix. Singular value decomposition ... -
Trypanosoma Infection Rates in Glossina Species in Mtito Andei Division, Makueni County, Kenya.
(University of Nairobi, 2015-11)African Animal Trypanosomiasis (AAT) transmitted cyclically by tsetse fly (Glossina spp.) is a major obstacle to livestock production in the tropical parts of Africa. The objective of this study was to determine the infection ... -
Trypanosome-induced ovarian dysfunction. Evidence of higher residual fertility in trypanotolerant small East African goats
(University of Nairobi.School of Biological Sciences, 1988-09)Changes in the length of oestrous cycles, plasma progesterone and oestradiol-17 beta levels were monitored for 6 months in Trypanosoma congolense-infected normocyclic small East African goats obtained from three tsetse-endemic ... -
Tryptophan-like and humic-like fluorophores are extracellular in groundwater: implications as real-time faecal indicators
(University of Nairobi, 2020)Fluorescent natural organic matter at tryptophan-like (TLF) and humic-like fluorescence (HLF) peaks is associated with the presence and enumeration of faecal indicator bacteria in groundwater. We hypothesise, however, that ... -
Tsetse and other biting fly responses to Nzi traps baited with octenol, phenols and acetone
(School of Biological Sciences, 2007)Octenol (1-octen-3-ol), acetone, 4-methylphenol, 3-n-propylphenol, and other potential attractants (human urine, stable fly faeces), as well as guiacol, creosol (potential repellents), were tested as baits for biting flies ... -
Two isoflavanones from the stem bark of Erythrina sacleuxii
(University of NairobiDepartment of Chemistry, University of Nairobi, 2000-11)From the stem bark of Erythrina sacleuxii two new isoflavanones, (R)-5,7-dihydroxy-2′,4′,5′-trimethoxyisoflavanone (trivial name, (R)-2,3-dihydro-7-demethylrobustigenin) and (R)-5-hydroxy-2′,4′,5′-trimethoxy-2″,2″-dimeth ... -
Two Lignans Derivatives and Two Fusicoccane Diterpenoids From the Whole Plant of Hypoestes Verticillaris (L.f.) Sol. Ex Roem. & Schult
(University of Nairobi, 2019)Bioassay-guided screening of Hypoestes verticillaris whole plant CH2Cl2:MeOH (1:1) extract for anti-plasmodial activity yielded four new compounds: two lignans 2, 6-dimethoxysavinin (1), 2,6-dimethoxy-(7E)-7,8-dehydrohel ...