Department of Chemistry: Recent submissions
Now showing items 221-240 of 337
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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 ... -
Recent Influences of Anthropogenic Activities and Seasons on Heavy Metal Distribution in Shoreline Sediments in Lake Victoria Near Kisumu City, Kenya
(Journal of Environmental Analytical Chemistry, 2017)The Winam Gulf on Lake Victoria around Kisumu city has seen increase in anthropogenic activities. The activities discharge pollutants, especially heavy metals into the lake. The heavy metals sink into sediments, which ... -
Evaluation of soil properties of sugarcane zones and cropping systems for improved productivity in Western Kenya
(International Journal of Agronomy and Agricultural Research (IJAAR), Vol. 11, No. 3, p. 1-16, 2017, 2017-09-30)Unsuitable soil properties can adversely affect sugarcane productivity. The role of soil chemical, physical and biological properties on low productivity has not been evaluated. Soil nutrient survey was conducted to evaluate ... -
Evaluation of sugarcane cropping systems in relation to productivity at Kibos in Kenya
(International Journal of Agricultural Policy and Research Vol.2 (7), pp. 256-266, 2014-07)Low sugarcane productivity is widespread and has persisted in all zones in western Kenya over the last decade despite the release of many improved sugarcane varieties during the same period. Three sugarcane varieties, two ... -
Evaluation of the Effectiveness of Traditional Rastrineobola argentea Sundrying Process Practiced along the Shores of Lake Victoria, Kenya
(Scientific & Academic Publishing, 2015-01-26)Quality of fish depends on its texture, odour and hinges on duration of harvesting and processing. Traditional sun-drying free-to air of Rastrineobola argentia who’s effectiveness and efficiency to reduce moisture content ... -
Synthesis of hydrophobic siliceous ferrierite by using pyridine and sodium fluoride
(Elsevier, 2013-11-15)We report for the first time, the successful synthesis of siliceous ferrierites with SiO2/Al2O3 = 138.8–324 by the hydrothermal treatment of aluminosilicate gel with the introduction of pyridine and easy-to-handle sodium ... -
Effects of zeolites X and Y on the degradation of malathion in water
(2013)The inclusion of both zeolites X and zeolite Y significantly affected the dissipation of malathion in water. In the fresh water, malathion degradation followed a pseudo-first order kinetics with concomitant half-life ... -
Metribuzin mobility in soil column as affected by environmental and physico-chemical parameters in Mumias sugarcane zone, Kenya
(2011-03)The physico-chemical parameters of soil, influences the soil solution characteristics and that may affect the sorption of soil applied herbicides. The present investigation reports the influence of physico-chemical ... -
Chimie Minérale 1
(2011-02-01)Le cours commence par un examen attentif du tableau périodique des éléments et de la façon dont il est organisé. La connaissance du tableau permet de saisir facilement et rapidement les concepts et les propriétés de la ... -
METRIBUZIN SORPTION DYNAMICS IN ACID SOILS OF NZOIA SUGARCANE ZONE IN WESTERN KENYA
(2011)The adsorption, desorption and leaching of metribuzin in agricultural soil samples taken from Nzoia sugarcane farming area in Kenya were determined using standard methods. The Freundlich adsorption isotherm constants ... -
The effect of cultivation techniques on tea quality
(Burleigh Dodds Science Publishing, Cambridge, UK, 2018) -
Flavanol Composition and Caffeine Content of Green Leaf as Quality Potential Indicators of Kenyan Black Teas
(1997)The Ñavanol composition and ca†eine content of green tea leaf, black tea quality parameters of theaÑavins, thearubigins, liquor brightness and total colour varied more among clones than with time of the year. In green ... -
Response of some black tea quality parameters to nitrogen fertiliser rates and plucking frequencies
(John Wiley & Sons, Ltd, 1994-12-01)The effects of the rate of application of nitrogenous fertiliser and frequency of plucking (harvesting) on various black tea quality parameters and yields were compared on done 6/8. High rates of nitrogen application and ... -
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 ... -
Effects of Geographical Area of Production on the Composition of the Volatile Flavour Compounds in Kenyan Clonal Black CTC Teas
(Cambridge University Press, 1988-04)The contents of the volatile flavour compounds and the flavour index of black teas vary with localities. The magnitude and order of the variations are clonally dependent, the relative performance of clones varying with ... -
Optimising fermentation time in black tea manufacture
(Elsevier, 1986)A comparative study using in-line theaflavins analysis (ILTF), theaflavins of made-tea analysis (TFMT) and tasters' evaluations, to optimise fermentation during tea manufacture, was carried out. All methods obeyed a quadratic ... -
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 ... -
Changes in theaflavin composition and astringency during black tea fermentation
(Elsevier, 1994-01-01)Both theaflavins and sensory evaluations vary in a quadratic manner with fermentation duration in the process of black tea manufacture. The rate of formation of total (Flavognost) theaflavins varies with clones, and within ...
