Browsing Department of Chemistry by Title
Now showing items 54-73 of 323
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Chlorophyll meter use on field grown tea: 1. The optimum leaf age and measuring positions on a leaf blade.
(Tea Research Foundation of Kenya, 2000)In a field experiment conducted in Kenya, a Hydro N-tester chlorophyll meter was used to determine the optimum age and reading position for the measurement of chlorophyll in leaves of tea (clone 6/8). Meter readings were ... -
Clonal plain black tea quality parameters responses of hard physical withered leaf to rehydration and fermentation durations
(2016-04-16)Hard physical withers in tea processing result in reduced plain black tea quality parameters, but improve flavoury black tea quality. Chemical withers with minimal moisture loss improve plain black tea quality parameters. ... -
Clonal variation in the individual theaflavin levels and their impact on astringency and sensory evaluations
(Elsevier, 1995-01-01)Clonal variation in the individual theaflavin levels and their impact on astringency and sensory evaluations -
Clonal Variations in the Response of Hard Physically Withered Leaf to Rehydration Following Long Chemical Wither Durations
(International Journal of Tea Science Vol 13, No. 1&2 (2017) : 72-79, 2017)Long chemical wither durations and hard physical wither reduce the quality of plain black tea, through reduction in total theaflavins production while encouraging thearubigins formation. Such quality reduction may vary ... -
Clonal Variations in the Response of Hard Physically Withered Leaf to Rehydration Following Long Chemical Wither Durations
(The International Society of Tea Science, 2017)Long chemical wither durations and hard physical wither reduce the quality of plain black tea, through reduction in total theaflavins production while encouraging thearubigins formation. Such quality reduction may vary ... -
Comparative Economic Analysis of Clonal Tea Yield Response to Nitrogen Fertiliser Rates within Selected Geographical Areas in Kenya
(INTERNATIONAL JOURNAL OF TEA S, 2020)Tea sector contributes approximately 30% of export earnings in Kenya. Despite the industry continuing to realize positive gross margins, high costs of production coupled with weak trends in export prices threaten its ... -
Comparative evaluation of ELISA kit and HPLC DAD for the determination of chlorpyrifos ethyl residues in water and sediments
(Elsevier, 2013-12-15)Enzyme linked immunosorbent assay (ELISA) kit is a versatile, cheap and relatively available tool that can be used in remote areas. In this study, performance of ELISA kit was evaluated in terms of accuracy, recovery, ... -
Comparative responses in plain black tea quality parameters of different tea clones to fermentation temperature and duration
(Elsevier, 2001-02-01)The amounts of black tea theaflavins, brightness, and sensory evaluations varied with clones in the order clone 6/8>SC12/28>S15/10, while thearubigins and total colour changed in the reverse order. The rates of change of ... -
Comparative Studies of Alum, Maerua Subcordata Root Tuber Powder and Juice Extract as Coagulation/Flocculation Agents
(2016)Turbidity is a great problem in water treatment. Comparative study was done on alum a commercial coagulant; Maerua subcordata root powder and juice extract a locally available natural coagulant to reduce turbidity and ... -
A comparison of adsorption equilibrium, kinetics and thermodynamics of aqueous phase clomazone between faujasite X and a natural zeolite from Kenya
(The South African Chemical Institute, 2015)In this study, a well-studied synthetic faujasite X (FAU-X) zeolite and a recently discovered natural zeolite material from Kenya (NZ-K) were compared for their efficiency in removal of clomazone, a herbicide and water ... -
Comparison of freeze and spray drying to obtain primaquine-loaded solid lipid nanoparticles
(IGI Global, 2017-07-01)The spray drying and freeze drying of various nanosized Solid Lipid Nanoparticle and the physicochemical attributes of the acquired particles were examined. Primaquine loaded Solid Lipid Nanoparticles dried by the two ... -
Comparison of gas chromatographic volatile profiling methods for assessing the flavour quality of kenyan black teas
(John Wiley & Sons, Ltd, 1992-01-01)A comparison is made of the various ratios used to quantify black tea aroma such as the ratio of the sum of gas chromatographic peak areas of compounds eluting before linalool (3,7-dimethyl-1,6-0ctadien-3-01) to those ... -
Controlling the reactivity of [Pd(II)(N^N^N)Cl]+ complexes using 2,6-bis(pyrazol-2-yl)pyridine ligands for biological application: Substitution reactivity, CT-DNA interactions and in vitro cytotoxicity study
(Elsevier, 2020)Four [(N^N^N)Pd(II)Cl]+ complexes [chloride-(2,2′:6′,2′′-terpyridine)Pd(II)]Cl (PdL1), [chlorido(2,6-bis(N-pyrazol-2-yl)pyridine)Pd(II)]Cl (PdL2), [chlorido(2,6-bis(3,5-dimethyl-N-pyrazol-2-yl)pyridine)Pd(II)]Cl (PdL3) and ... -
Controlling the reactivity of [Pd(II)(N^N^N)Cl]+ complexes using 2,6-bis(pyrazol-2-yl)pyridine ligands for biological application: Substitution reactivity, CT-DNA interactions and in vitro cytotoxicity study
(Elsevier, 2020)Four [(N^N^N)Pd(II)Cl]+ complexes [chloride-(2,2′:6′,2′′-terpyridine)Pd(II)]Cl (PdL1), [chlorido(2,6-bis(N-pyrazol-2-yl)pyridine)Pd(II)]Cl (PdL2), [chlorido(2,6-bis(3,5-dimethyl-N-pyrazol-2-yl)pyridine)Pd(II)]Cl (PdL3) and ... -
Correlation of theaflavins content and valuations of Kenyan black teas
(John Wiley & Sons, Ltd, 1986-05-01)Correlation between theaflavins content and tasters' valuations of Kenyan black teas generally give positive but statistically non-significant correlation coefficients. In 105 correlations using 12 samples each, only ... -
Covid-19 Evolution: Analysis of Public Health Countermeasures in Kenya.
(Research gate, 2020)Millions of people across the globe are currently at a risk of infection of SARS-Cov-2, have been infected and others have died. The coronavirus has spread worldwide despite the multiple countermeasures to limits its ... -
Cyclooxygenase inhibitory compounds from Gymnosporia heterophylla aerial parts
(Elsevier, 2017-06-01)Gymnosporia heterophylla (Celastraceae) is an African medicinal plants used to treat painful and inflammatory diseases with partial scientific validation. Solvent extractions followed by repeated chromatographic ... -
Degradation capacity of a 1, 2, 4-trichlorobenzene mineralizing microbial community for traces of organochlorine pesticides
(Elsevier, 2010-07-15)A soil-borne microbial community isolated from a contaminated site was previously shown to mineralize 1,2,4-trichlorobenzene (1,2,4-TCB) under aerobic conditions. The key degrader in this community was identified as ... -
Development of a multiplex PCR technique for simultaneous detection of Sweet potato feathery mottle virus and Sweet potato chlorotic stunt virus
(An International Journal of the Italian Phytopathological Society, 2010-07-01)Virus diseases, especially those caused by mixed infections, are among the economically most devastating diseases of sweet potato. Sweet potato virus disease (SPVD), which is caused by mixed infection of Sweet potato ...