Browsing Department of Chemistry by Title
Now showing items 158-177 of 323
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Gender Analysis of Economic Efficiency in Smallholder Tea Production in Kenya
(Eastern Africa Agricultural Economics Society,1979, 2003)If the productivity of tea among the smallholders can only increase to about 2500 kg/ha/yr, the national projection of 300 thousand metric tones would be realized without the need to allocate more land to tea enterprise. ... -
Genotype and environment interactions of yields and yield components of tea (Camellia sinensis) cultivars in Kenya
(Scientific Research Publishing, 2016)The tea crop provides income and employment to rural populations in many countries. In Kenya, tea, which is the leading export commodity crop, is grown in highlands east and west of the Rift Valley at altitudes ranging ... -
High concentrations of polycyclic aromatic hydrocarbons found in water and sediments of car wash and kisat areas of Winam Gulf, Lake Victoria-Kenya
(Springer-Verlag, 2009-01-09)Mean concentrations of selected USEPA priority polycyclic aromatic hydrocarbons (PAHs) in surface sediments and water samples from Car Wash and Kisat areas of Winam Gulf, Lake Victoria in Kenya have been determined ... -
An HPTLC-densitometry method for the quantification of pharmacologically active alkaloids in Sceletium tortuosum raw material and products
(Akadémiai Kiadó, 2012)Mesembrine-type alkaloids are reported to be responsible for the psychoactive properties of Sceletium tortuosum. The aim of the study was to develop a simple, rapid, and precise high-performance thin-layer chromatography ... -
Hydrothermal synthesis of zeolites using silica extracted from tropical volcanic ash
(Royal Society of Chemistry, 2023)This study addresses the reliance on costly aluminosilicate sources for the synthesis of zeolites by exploring the use of silica extracted from tropical volcanic ash. The volcanic ash contained CaO, in the form of calcite ... -
Immobilization of chlorobenzenes in soil using wheat straw biochar
(American Chemical Society, 2013-04-25)Biochar has shown great potential for immobilizing organic contaminants in soil. In this study, pentachlorobenzene (PeCB), 1, 2, 4, 5-tetrachlorobenzene (1, 2, 4, 5-TeCB), and 1, 2, 4-trichlorobenzene (1, 2, 4-TCB) ... -
Impact of Agronomic Inputs in Sugarcane Farming on River Kuywa Surface Water Quality Traversing Sugarcane zones in Western Kenya.
(Maasai mara university, 2011)For sustainable agriculture, the health of people indulged in this activity is paramount. Disease causative agents in these areas should be constantly checked and mitigation measures taken. This research determined levels ... -
Impact of bioaccessible pyrene on the abundance of antibiotic resistance genes during Sphingobium sp.-and sophorolipid-enhanced bioremediation in soil
(Elsevier, 2015-12-30)Abstract Soils are exposed to various types of chemical contaminants due to anthropogenic activities; however, research on persistent organic pollutants and the existence of antibiotic resistance genes (ARGs) is limited. ... -
Impacts of climate-induced changes on the distribution of pesticides residues in water and sediment of Lake Naivasha, Kenya
(Springer Netherlands, 2013-03-01)This study reports evidence of increased chlorpyrifos contamination in sediment and water in Lake Naivasha following its intensive application in the horticultural farms in the catchment area. Analytical results show that ... -
Improved biodegradation of 1, 2, 4-trichlorobenzene by adapted microorganisms in agricultural soil and in soil suspension cultures
(Elsevier, 2011-08-01)Inoculating soil with an adapted microbial community is a more effective bioaugmentation approach than inoculation with pure strains in bioremediation. However, information on the potential of different inocula from sites ... -
Improved biodegradation of 1,2,4-trichlorobenzene by adapted microorganisms in agricultural soil and in soil suspension cultures
(Pedosphere, 2011)Inoculating soil with an adapted microbial community is a more effective bioaugmentation approach than inoculation with pure strains in bioremediation. However, information on the potential of different inocula from sites ... -
In Vitro Permeation of Mesembrine Alkaloids from Sceletium tortuosum across Porcine Buccal, Sublingual, and Intestinal Mucosa
(Planta Medica, 2012)Sceletium tortuosum is an indigenous South African plant that has traditionally been used for its mood-enhancing properties. Recently, products containing S. tortuosum have become increasingly popular and are commonly ... -
Influence of anthropogenic activities and seasons on heavy metals in spring water along Amala and Nyangores tributaries of the Mara River Basin
(Academic Journal, African Journal of Environmental Science and Technology, 2018-07)Anthropogenic activities, including replacing natural forests with human settlements and increased agricultural activities have environmental impacts. The activities can contaminate aquatic ecosystems including spring ... -
INFLUENCE OF AREA OF PRODUCTION, NITROGENOUS FERTILIZER RATES AND PLUCKING INTERVALS ON THE PRODUCTION OF FATTY ACIDS IN CLONAL TEA (Camellia sinensis (L.O) Kuntze) LEAVES
(Maseno University, 2010)Tea, Camellia sinensis, is widely grown in the highlands of Kenya for manufacture of mainly black tea. The most costly inputs in tea cultivation are nitrogenous fertiliser and plucking which are key determinants of yield ... -
The influence of geographical area of production and nitrogenous fertiliser on yields and quality parameters of clonal tea
(2010-04-01)Variations in requirements for tea production in Kenya and factors controlling growth and production of secondary metabolites responsible for the quality parameters are indicative of the need for non-uniform recommendations. ... -
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 ...