Browsing Department of Chemistry by Title
Now showing items 174-193 of 323
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Influence of Geographical Area of Production on the Caffeine and Flavan-3-ol Profiles of Selected Clonal Green Tea Leaves from Smallholder Tea Farms in Kenya
(International Society of Tea Science, 2019)Despite the use of similar cultivars in the smallholder tea sector in Kenya, resultant black tea quality varies. These variations could in part be arising from the formation of varying quantities and ratios of the black ... -
Influence of land use practices on water physicochemical parameters and nutrients loading along the Mara River of East Africa
(AcademicJournal, African Journal of Environmental Science and Technology, 2018-07)Mara River originates from the Mau Forest and traverses through landscapes with varying activities. Over the years, Mara River Basin has witnessed population increase, accompanied with conversion of forestlands into ... -
Influence of Location of Production, Season and Genotype on Caffeine and Flavan-3-ols in Young Green Tea (Camellia sinensis) Leaves in Kenya
(David Publishing Company, 2013)Although tea is grown in agro-ecological regions widely varying in environmental factors affecting yield and quality, planters usually import genetic materials across the different growing regions assuming genotypes with ... -
Influence of Nitrogen Fertilisation on Red Spider Mites (Oligonychus coffeae Nietner) and Overhead Volatile Organic Compounds in Tea (Camellia sinensis)
(International Journal of Tea Science Vol 13, No. 1&2 (2017) : 52-59, 2017)Nitrogen fertilisation influences tea yields, quality and pests infestation levels. Red spider mites reduce tea production in western Kenya during prolonged droughts. Nitrogen fertiliser use maybe an agronomic practice ... -
Influence of nitrogen fertilizer rates and harvesting intervals on the clonal tea green leaf fatty acids levels in the Lake Victoria Basin of Kenya
(CABI, 2011)Tea agronomic recommendations in Lake Victoria basin are uniform, despite different regions producing teas of different qualities and yields. It is not known if these differences arise from variations in cultivars, agronomic ... -
Influence of Nitrogenous Fertilizer Rates and Plucking Intervals on Tea in Peatland and Highland Ultisol Soils of Rwanda: 1 Tea Yields
(International Journal of Tea Science, Volume 15 Issue 1 (2020, 2020)Tea in Rwanda, is grown in different agro-ecosystems comprising highlands and drained low elevation peatlands. The plantations use uniform agricultural practices imported from Eastern Africa countries, but without re-testing ... -
Influence of region of production on clonal black tea chemical characteristics
(2008-05-01)Production of black tea from the same vegetatively propagated (VP) cultivars, in Kenya and Malawi, shows variations in both chemical composition and quality. Whereas it is possible to produce black teas with similar ... -
Influence of region of production on relative clonal plain tea quality parameters in Kenya
(Elsevier, 2010-04-01)Tea is grown in diverse regions with varying climates. Growers seek high-yielding and superior quality cultivars to improve profitability of the enterprise. A superior quality genotype in one location is assumed to ... -
Inhibition Kinetics and Theoretical Studies on Zanthoxylum chalybeum Engl. Dual Inhibitors of α-Glucosidase and α-Amylase
(MDPI, 2023)Compounds from Zanthoxylum chalybeum Engl. were previously reported for inhibitory activities of amylase and glucosidase enzymatic action on starch as a preliminary study toward the establishment of a management strategy ... -
Inorganic Chenistry 1
(2018-03-10)Introductory Chemistry 1 undepins the concepts of matter, measurements, structure and periodicity of the atom, Molecules and compounds, and their chemical reactions. This study builds on the aforementioned concepts by being ... -
The interactive biotic and abiotic processes of DDT transformation under dissimilatory iron-reducing conditions
(Pergamon, 2015-11-30)Abstract The objective of the study was to elucidate the biotic and abiotic processes under dissimilatory iron reducing conditions involved in reductive dechlorination and iron reduction. DDT transformation was ... -
An investigative study of dwarf mango (Boribo Muyini) seed kernel extract against inflammatory agent Staphylococcus aureus
(Journal of Scientific and Innovative Research, 2015)Alternative herbal medicine has been used to treat various infections from centuries. Natural plants contain Phyto constituents having similar chemical properties as of synthetic antibiotics. Boribo Muyini a typical Tanzanian ... -
Isolation and characterization of a toxic metal-tolerant Phenanthrene-degrader Sphingobium sp. in a two-liquid-phase partitioning bioreactor (TPPB)
(2013-10-01)A phenanthrene-degrading strain PHE3, identified as the genus of Sphingobium, was isolated using a two-liquid-phase partitioning bioreactor. More than 96% of the initial amount (up to 100 mg l− 1 silicone oil) of ... -
Isolation and chemical characterisation of pyrrolisidine alkaloids from some senecio
(University of Calgary, 1991) -
Isolation and detailed 1H and 13C NMR structural assignment for three trachylobanes from Psiadia punctulata (Asteraceae) grown in Africa
(Elsevier, 2022-04-01)The first isolation of a trachylobane from an African specimen of Psiadia punctulata (Asteraceae) is presented in this paper. A complete 1H and 13C NMR spectral analysis of this compound and two other trachylobane diterpenes, ... -
Isolation of a new β-carboline alkaloid from aerial parts of Triclisia sacleuxii and its antibacterial and cytotoxicity effects
(Taylor & Francis, 2017-03-04)A new β-carboline alkaloid named sacleuximine A (1) together with known compounds palmatine (2), isotetrandrine (3), trans-Nferuloyltyramine (4), trans-N-caffeoyltyramine (5), yangambin (6), syringaresinol (7), sesamin ... -
Kinetic, sorption isotherms, pseudo-first-order model and pseudo-second-order model studies of Cu (II) and Pb (II) using defatted Moringa oleifera seed powder
(The Journal of Phytopharmacology, 2016)In the recent decades, there has been a concern on heavy metals in waste water and high cost of conventional methods of removing heavy metals, for this reason search on adsorbents of biological origin which is low cost and ... -
Linear, primary monohaloalkane chemistry in NaX and NaY faujasite zeolites with and without Na0-treatment: Zeolites as nucleophilic reagents II
(Elsevier, 2006-06-20)This work undertakes, we believe for the first time, a study of the chemistry of alkyl halides in Na0 treated zeolites. It concludes that untreated zeolites do nucleophilic chemistry to the degree that the host is electron ... -
Long term effects of nitrogenous fertilizers on tea yields, nutrients uptake and some soil chemical properties
(Soil Science Society of East Africa, 2005)A field experiment was set up to determine long tenn responses of different rates of nitrogen fertilizers namely used in tea, N~KS 25:5:5:5 and NPK 20: 10: 10, on tea 'Ields, nutrient uptake and soil chemical properties. ... -
Long term fertilizer use on high yielding clone S15/10: Tea yields
(International society of tea science, 2008)High production of young tender shoots of Camellia sinensis L. O. Kuntze to make tea beverages leads to soil nutrients depletion through harvested crop and leaching. The production can be sustained by replenishing the lost ...