Department of Chemistry: Recent submissions
Now showing items 181-200 of 326
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Assessment of organochlorine pesticides (OCPs) contamination in relation to physico-chemical parameters in the Upper River Kuja Catchment, Kenya (East Africa)
(2019)Concentrations of 17 organochlorine pesticides residues (alpha-HCH, beta-HCH, gamma-HCH, deltaHCH, Heptachlor, Aldrin, Endrin, Endosulfan I, Dieldrin, p,p’-DDT, Endosulfan II, p,p’-DDD, Endrin aldehyde, p,p’-DDE, Endosulfan ... -
Evidence of non-DDD pathway in the anaerobic degradation of DDT in tropical soil
(Springer Berlin Heidelberg, 2019-03-01)DDT transformation to DDD in soil is the most commonly reported pathway under anaerobic conditions. A few instances of DDT conversion to products other than DDD/DDE have been reported under aerobic conditions and hardly ... -
Monitoring the occurrence and distribution of selected organophosphates and carbamates pesticide residues in the ecosystem of Lake Naivasha, Kenya
(Taylor & Francis, 2014-08-07)Although use of pesticides is critical in agricultural production, their residues present a potential risk to non-target organisms and lower the quality of surface water. In Kenya for instance, widespread use of pesticides ... -
Elucidating the causes of low phosphorus levels in ferralsols of Siaya County, Western Kenya
(Academic Journals, 2015-09-01)Low available soil phosphorus (P) is one of the factors limiting crop production in western Kenya. Availability of soil P depends on amount of apatite, addition of P fertilizers, P fixing potential of a soil, soil water ... -
Bioactive carbazole alkaloids from Alysicarpus ovalifolius (Schumach)
(The Korean Society for Applied Biological Chemistry, 2015-12-01)Phytochemical and biological evaluation of the stem bark of Alysicarpus ovalifolius led to the isolation of three carbazole alkaloids identified as mohanimbine (1), koenimbine (2) and koenidine (3) along with quercetin ... -
Effects of cropping systems and agricultural lime on soil properties and nutrient content of sugarcane on acidified soils of Kisumu County, Kenya
(American Journal of Agriculture and Forestry, 2016-07-23)Acid soils cause soil fertility problems such as Al and Mn toxicity, Ca, Mg, N deficiency and P fixation. These are constraints to high crop yields. Historically, liming is the common management practice used to neutralize ... -
Assessment of Levels of Nutrients in Selected ALVs at Different Harvesting Stages and Locations of Production in Western Kenya
(International Journal of Biochemistry Research & Review, 2019)Proper nutrition contributes to declines under-five mortality rates and improves the productivity of adults. Addressing nutritional problems requires adequate information on the diets of individuals and populations. African ... -
Chemical constituents of Ocimum kilimandscharicum Guerke acclimatized in Kakamega Forest, Kenya
(Chemical Society of Ethiopia, 2019)The genus Ocimum belongs to the Lamiaceae family and is made of almost 200 species of herbs and shrubs which have potential medicinal properties. The species are native to the tropical and temperate climate zones around ... -
Selected heavy metal levels in water and fish from winam gulf in Lake Victoria near Kisumu city, Kenya
(International Journal of Environmental and Ecology Research, 2019)Lake Victoria is the largest freshwater and fishery lake in Africa. Kisumu City, located at the shore of Winam Gulf has industrial activities discharging effluents into the lake with potential of contaminating the lake ... -
Flavonol glycosides with insecticidal activity from methanol extract of Annona mucosa Jacq. leaves
(Islamic Azad University, Shahrood Branch Press, 2019-12)Three flavonoids, quercetin 3-O-β-D-glucoside (1), quercetin 3-O-α-Darabinoside (2) and kaempferol-3-O-β-D-galactoside (3) were isolated from the methanol extract of the leaves of Annona mucosa Jacq. Their structures ... -
Catechins and Plain Black Tea Parameters Variations in Selected Tea Growing Agro-Ecological Zones in Kenya
(International Society of Tea Science, 2019)Over 60% of tea in Kenya is produced by smallholder tea farmers distributed in the East and West of the Rift Valley. With all smallholder tea farmers using the same production technologies including planting materials, the ... -
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 ... -
Variations of fatty acids levels in young shoots of clonal tea with location of production and nitrogenous fertilizer rates in the Kenya highlands
(Journal of Agricultural Science and Technology, 2012)Tea leaves contain unsaturated fatty acids, key precursors of volatile compounds contributing to tea aroma quality. Tea is cultivated in areas with diverse environmental conditions. Nitrogenous fertilizers influence tea ... -
Radiation Use Efficiency and Yield Responses of Clonal Tea (Camellia sinensis) to Locations of Production
(International Society of Tea Science, 2019)Tea in Kenya is grown in the high and medium rainfall areas of the Kenyan highlands in east and west of the Rift Valley, at altitudes ranging from 1300 to 2700 m above mean sea level. Variability in responses of tea genotypes ... -
Response of Plain Black Tea Parameters, Individual Theaflavins and Yields Due to Location of Production and Clones within Lake Victoria Basin
(International Society of Tea Science, 2019)Tea (Camellia sinensis) is a major cash crop and leading foreign exchange earner, contributing to poverty alleviation by providing employment and livelihood to many stakeholders in the producing countries. Production has ... -
Fertilizer Response and Environment Interactions of Yield and Yield Components of Clonal Tea (Camellia Sinensis) in Kenya
(International Society of Tea Science, 2019)Tea is an important cash crop, providing income and employment to rural populations in many countries. In Kenya, tea is the leading export commodity crop and is grown in highlands east and west of the Rift Valley at altitudes ... -
Assessment of Levels of Nutrients in Selected ALVs at Different Harvesting Stages and Locations of Production in Western Kenya
(International Journal of Biochemistry Research & Review, 2019-04)Proper nutrition contributes to declines under-five mortality rates and improves the productivity of adults. Addressing nutritional problems requires adequate information on the diets of individuals and populations. African ... -
Applications of Active and Passive Sampling Techniques in Environmental Monitoring of Organochlorine Pesticides (OCPs) in Kenya
(www.iosrjournals.org, 2019-07)This study evaluated the efficiency of using active sampling to estimate the environmental levels of bioavailable persistent organic pollutants (POPs) by introducing graded filters. Long-term passive sampling was combined ... -
Variations of Fatty Acids Levels in Young Shoots of Clonal Tea With Location of Production and Nitrogenous Fertilizer Rates in the Kenya Highlands
(Journal of Agricultural Science and Technology, 2012)Tea leaves contain unsaturated fatty acids, key precursors of volatile compounds contributing to tea aroma quality. Tea is cultivated in areas with diverse environmental conditions. Nitrogenous fertilizers influence tea ... -
Fate Studies of Chlorsulfuron in Selected Soils Within the Mara River Basin of Kenya
(Maseno University, 2016)Chlorsulfuron is a sulfonylurea herbicide used to control broadleaf and grass weeds in wheat farms within the Mara River Basin. It is assumed to be environmentally safe due to low application rates, relatively shorter ...