Faculty of Science & Technology (FST): Recent submissions
Now showing items 4201-4220 of 4284
-
I-Tetralinyl Group for Asparagine Side-Chain Protection, and Application to Bee-SolidPhase Peptide Synthesis of Mesotocin
(Chemistry, 2004)Mesotocin, a nonapeptide amide, was synthesised on a benzhydryl-resin using the Boc-strategy. Benzyl group was use~ in the protection of the side-chains of tyrosine and cysteine. Tetralinyl and benzhydryl groups were used ... -
Environmental effects of selected chemical and physical geothermometers at Olkaria geothermal power plant
(Chemistry, 2010)To evaluate environmental implications of the geothermal power plant at Olkaria Kenya. fluid samples ,vere collected (it Olkaria power stations (l and 2) and Olkaria wells 908 and 701. They ,I'ere analyzed for; Cl,H]S, ... -
Conversion of vernonia galamensis oil to pyridinylvernolamides and their antimicrobial activities
(Chemical Society of EthiopiaChemistry, 2006)Vernonia oil obtained by Soxhlet extraction from the seeds of Vernonia galamensis ssp. nairobensis was reacted with 2-aminopyridine, 2-(aminomethyl)pyridine and 2-(aminoethyl)pyridine using a 1:3 mole ratio of vernonia ... -
Synthesis of Vernolamides from Vernonia galamensis Oil under Varied Conditions and Their Antimicrobial Activities
(Chemistry, 2006)The oil extracted from the seeds of Vernonia galamensis ssp. nairobensis was reacted with 1,6-diaminohexane and 1,8-diaminooctane using a 1:3 molar ratio of vernonia oil to amine to give the corresponding vernolamides. ... -
Electron transfer properties of 2-acetylferrocenyl2-thiophenecarboxylsemicarbazone and its copper (ii) complex
(Chemistry, 2011)This work is aimed at obtaining the electrochemical properties of 2-acetylferrocenyl-2thiophenecarboxylsemicarbazone (LH) and Copper (II) complex of 2-acetylferrocenyl-2thiophenecarboxylsemicarbazone (CuL2), which were ... -
Electrochemical Characterization of Myoglobin-Polylysine Films at a Temperature Range of 6–808C
(WileyChemistry, 2010)This work demonstrated for the first time that myoglobin cross-linked in polylysine films is electrochemically active at 68C. At 68C, these protein films exhibited reversible reduction/oxidation peaks which are characteristic ... -
A note on metric equivalence of some operators
(Pushpa Publishing House, Allahabad, INDIASchool of mathematics, 2012)In this paper, we study the metric equivalence relation and closely related relations on some classes of operators. We describe the spectral picture of metrically equivalent operators. We give some conditions when metric ... -
A note on a-self -adjoint and a-skew -adjoint operators and their extensions
(School of mathematics, 2012)In this paper we introduce the notions of an A-self-adjoint, an A-skewadjoint linear operator, where A is a self-adjoint and invertible operator and related classes of operators, which generalize some known classes ... -
Investigation of pollutants, determination of physico-chemical characteristics of the Nairobi river and remediation of some toxic heavy metals using fish bones
(University of NairobiChemistry, 2010)A Study was conducted to determine the level of pollution in the Nairobi River. The study covered four sampling sites located along the river, stretching from upstream at Ondiri swamp then moving to Museum Hill Bridge ... -
Phytochemical investigation of the stem bark of millettia oblata ssp. Teitensis for antiplasmodial andlarvicidal principles
(University of NairobiChemistry, 2011)The genus Millettia is rich in flavonoids and isoflavonoids. In the search for compounds with antiplasmodial and larvicidal activities from medicinal plants, the stem barks of Millettia oblata ssp. teitensis were analysed. ... -
Human evolution in a variable environment: the amplifier lakes of Eastern Africa
(Geology, 2000)The development of the Cenozoic East African Rift System (EARS) profoundly re-shaped the landscape and significantly increased the amplitude of short-term environmental response to climate variation. In particular, the ... -
Need assessment for climate information on decedal timescales and longer
(Geology, 2000)Societal needs for climate information on decadal timescales is confirmed in terms of its potential value and relevance as a driver in sector decision-making, but such information is currently lacking. Predictions and ... -
Geology, geochemistry, and stratigraphy of Lemudongo formation, Kenya Rift Valley
(Geology, 2007)The Lemudongo Formation is defined here as part of a late Miocene to Late Pleistocene sequence of stratified lavas, air-fall and waterlain tuffs, lacustrine, alluvial sediments, and paleosols, that crop out over an ... -
Environmental degradation through quarrying: a case study in Tala-Kangundo area, Central Kenya
(Geology, 2003)In the Tala-Kangundo area, located approximately 50 km ENE of Nairobi, Kenya, quarrying of volcanic tuffs for building stone is causing a serious environmental degradation. Agricultural land is being destroyed at an ... -
Active fault segments as potential earthquake sources: inferences from integrated geophysical mapping of the Magadi fault system, Southern Kenya Rift
(Geology, 2010)Southern Kenya Rift has been known as a region of high geodynamic activity expressed by recent volcanism, geothermal activity and high rate of seismicity. The active faults that host these activities have not been ... -
Remote sensing and geophysical investigations of the geodynamic activities at lake Magadi, Southern Kenyan Rift.
(School of Physical Sciences, 2012)The tectonic lineaments and thermal structure of Lake Magadi, southern Kenyan rift system, were investigated using ASTER data and geophysical methods. Five N-S faults close to known hot springs were identified for ... -
Structural and Optical Characterization of Nitrogen-doped TiO2 Thin Films Deposited by Spray Pyrolysis on Fluorine Doped Tin Oxide (FTO) Coated Glass Slides
(School of Physical Sciences, 2012)Undoped and nitrogen-doped titanium dioxide (TiO2) thin films of 400 nm thick deposited by spray pyrolysis were structurally and optically characterized. The effect of substrate temperature on the optical properties of ... -
Performance of TiO2/In(OH)iSj/Pb(OH)xSy Composite ETA Solar Cell Fabricated from Nitrogen Doped TiO2 Thin Film Window Layer
(School of Physical Sciences, 2012)In this work, Titanium Dioxide (TiO2) thin films were prepared by spray pyrolysis and thermally annealed at 400 oC. The films were characterized as deposited (no annealing) as well as after annealing. Optical studies ... -
Investigation of Radiative Characteristics of the Kenyan Atmosphere due to Aerosols Using Sun Spectrophotometry Measurements and the COART Model
(Taiwan Association for Aerosol ResearchSchool of Physical Sciences, 2013)Variations in the radiative characteristics of aerosols can be used to quantify their effects on climate. This study evaluated the temporal-spatial variability of aerosol radiative characteristics at λ = 440 nm, λ = 675 ... -
Multielemental Analysis of Limestone and Soil Samples of Kitui South (Kenya) Limestone Deposits
(School of Physical Sciences, 2012)The results of analysis of heavy metal in limestone and soil samples from the limestone deposit areas of Kitui South, Kenya were reported in this paper. The analysis was carried out to assess the environmental impact of ...
