Browsing Department of Chemistry by Title
Now showing items 261-280 of 323
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Role of cosubstrate and bioaccessibility played in the enhanced anaerobic biodegradation of organochlorine pesticides (OCPs) in a paddy soil by nitrate and methyl...
(Springer Berlin Heidelberg, 2014-07-01)Abstract The present study was conducted to investigate the anaerobic biodegradation potential of biostimulation by nitrate (KNO 3) and methyl-β-cyclodextrin (MCD) addition on an aged organochlorine pesticide ... -
The role of Kenya Tea Development Agency Limited in the small-scale tea holder development in Kenya.
(International Society of Tea Science, 2008)The Kenya Tea Development Authority (KTDA) was formed in 1964 to take over the functions of the Special Crops Development Authority (SCDA), which had been set in 1960 to promote tea growing by indigenous Kenyans (Africans). ... -
Ruwenine and ruzorine: Pyrrolizidine alkaloids of Senecio ruwenzoriensis
(Pergamon, 1992-09-01)A reinvestigation of Kenyan Senecio ruwenzoriensis reported to contain two alkaloids of unknown structures, ruwenine and ruzorine, resulted in the isolation of the pyrrolizidine alkaloid isoline, accompanied by what appeared ... -
Seasonal and Environment Variations of Yields and Yield Components of Tea (Camellia sinensis) Cultivars in Kenya
(International Journal of Tea Science Vol 13, No. 1&2 (2017) : 10-24, 2017)In Kenya, tea is grown in highlands east and west of the Rift Valley at altitudes ranging from 1300 m to 2700 m above mean sea level. These areas vary widely in seasonal and locational environmental factors leading to ... -
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 ... -
Sensoring Gaseous Ammonia using Cation Exchanged Faujasite-X Zeolite
(International Journal of BioChemiPhysics,, 2010)work presents a method that uses cheap, thermally stable and reusable cation exchanged solid zeolites to detect gaseous ammonia. Here, 24 separately exchanged Cu2+ and Co2+ cations per unit cell of 1.23 Si/Al Faujasite-X ... -
Sesquiterpenoids with antiplasmodial activities from Warburgia stuhlmanii Engl. root bark
(Islamic Azad University, Shahrood Branch Press, 2023-06-01)Phytochemical investigation of Warburgia stuhlmannii ethyl acetate root extract led to isolation of ten known compounds identified as polygodial (1), cinnamolide (2), warburganal (3), bemadienolide (4), ugandensidial (5), ... -
Simultaneous quantification of acetaminophen and tryptophan using a composite graphene foam/Zr-MOF film modified electrode
(Royal Society of Chemistry, 2020)A graphene foam/zirconium-based metal–organic framework composite (GF/UiO-66) was synthesised and then employed to modify glassy carbon electrodes (GCE). These modified electrodes were successfully used for the simultaneous ... -
Simultaneous quantification of acetaminophen and tryptophan using a composite graphene foam/Zr-MOF film modified electrode
(New Journal of Chemistry, 2020) -
Single and binary adsorption of sulfonamide antibiotics onto iron-modified clay: linear and nonlinear isotherms, kinetics, thermodynamics, and mechanistic studies
(Springer International Publishing, 2018-10-01)Iron-modified raw kaolinite clay (Fe-MC) was synthesized by co-precipitation method, characterized, and then applied as a low-cost adsorbent to sequester sulfachloropyridazine (SCP) and sulfadimethoxine (SDM), emergent ... -
Single and binary adsorption of sulfonamide antibiotics onto iron‑modifed clay: linear and nonlinear isotherms, kinetics, thermodynamics, and mechanistic studies
(Springer, 2018)Iron-modifed raw kaolinite clay (Fe-MC) was synthesized by co-precipitation method, characterized, and then applied as a low-cost adsorbent to sequester sulfachloropyridazine (SCP) and sulfadimethoxine (SDM), emergent ... -
Single and competitive removal of sulfachloropyridazine and sulfadimethoxine onto natural kaolinite clay: kinetics, isotherms and thermodynamics studies
(2017)In this study, local untreated clay was tested for its ability to adsorb sulfonamides, namely, sulfachloropyridazine (SCP) and sulfadimethoxine (SDM) from synthetic wastewater by batch equilibration. The time-dependent ... -
Sodium X-type faujasite zeolite decomposition of dimethyl methylphosphonate (DMMP) to methylphosphonate: Nucleophilic zeolite reactions I
(Elsevier, 2006-06-20)Dimethyl methylphosphonate (DMMP), used extensively as a nerve agent simulant, strongly adsorbs in X-type faujasite zeolite and undergoes nucleophilic substitution by the supercage oxygens. Solid state magic angle spinning ... -
Sources, distribution, and risk assessment of organochlorine pesticides in Nairobi City, Kenya. Journal of Environmental Sciences, 96, 178–185
(Elsevier, 2020)The distribution and sources of organochlorine pesticides (OCPs) in air and surface waters were monitored in Nairobi City using triolein-filled semipermeable membrane devices (SPMDs). The SPMDs were extracted by dialysis ... -
Spartial and seasonal variations in concentrations of polycyclic aromatic hydrocarbons in water and sediment of Kisumu City Bay of Winam Gulf, Lake Victoria-Kenya
(2009-11-01)Seasonal and offshore concentration variations for selected sixteen priority pollutant polycyclic aromatic hydrocarbons (PAHs) in surface sediments and water of Car Wash and Kisat areas of Winam Gulf, Lake Victoria, ... -
Spatial distribution and habitat characterization of mosquito species during the dry season along the Mara River and its tributaries, in Kenya and Tanzania
(Bio Med Central, 2018-12)Vector-borne diseases are increasingly becoming a major health problem among communities living along the major rivers of Africa. Although larger water bodies such as lakes and dams have been extensively researched, ... -
Spatial distribution and habitat characterization of mosquito species during the dry season along the Mara River and its tributaries, in Kenya and Tanzania
(BioMed Central, 2018-01-12)Vector-borne diseases are increasingly becoming a major health problem among communities living along the major rivers of Africa. Although larger water bodies such as lakes and dams have been extensively researched, ... -
Spatial distribution and temporal trend in concentration of carbofuran, diazinon and chlorpyrifos ethyl residues in sediment and water in Lake Naivasha, Kenya
(Springer, 2012)Chlorpyrifos ethyl was found to be widely distributed in water and sediment in Lake Naivasha. Higher levels were reported in sediment (11.2–30.0 ng g-1 dry weight (dw) in wet season than in dry season (4.7–17.4 ng g-1 ... -
Spectroscopic characterization of the metal cation siting and the adsorbate-cation interactions in copper (II) and cobalt (II) exchanged faujasite-X zeolite
(State University of New York at Binghamton, 2006)Toxic chemicals are abundant in the environment and their detection often requires very costly and time consuming methods. Where such molecules are able to interact with the transition metal cations, their characteristic ...