Browsing Department of Chemistry by Title
Now showing items 272-291 of 323
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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 ... -
Split application of nitrogen fertilizer rates in two tea cultivars grown in the Eastern and Western highlands of Kenya: I. Confirmatory results on yield effects.
(Tea Research Foundation of Kenya, 2000)Two experiments were conducted in Kericho and Kangaita, Kenya during 19991-98 to investigate the effects of nitrogen fertilizer rates (50, 100, 200, 400 and 800 kg/ha) and frequencies of application (1, 2 and 4 split ... -
Structural, Magnetic And Electronic Properties Of NbN Polymorphs By Ab-Initio Study
(2020)The structural, electronic and magnetic properties of NbN are studied by ab initio method by considering the four polymorphs {B1 (rock salt), B4 (wurtzite), B81 (NiAs) and Bh (WC-type)} of NbN. The results show that ... -
Structures and activities of academy of sciences
(Maseno University and “Excellence Center for Development Cooperation – Sustainable Water Management” (www. exceed-swindon.org) network, 2016) -
Sub-Saharan Africa’s Way of Water Management
(Springer International Publishing, 2022)The book addresses the situation of water and wastewater management in Africa from present angle, underpinned by selected case studies. The publication of this book will also be the start of a book series that in more ... -
SURVEY OF SWEET POTATO VIRUSES IN WESTERN KENYA AND DETECTION OF CUCUMBER MOSAIC VIRUS
(2010)Sweet potato is an important food crop worldwide, but several pests and diseases limit its production. In eastern Africa, virus-induced diseases rank second to weevils in causing yield reduction. Symptomatic sweet potato ... -
Sustainability of smallholder tea growing in Kenya
(2007)Although tea was introduced in Kenya in 1903, Africans (natives) were barred from growing the crop until after independence in 1963 when the legislation was repealed. Africans started growing tea under the smallholder tea ... -
Synthesis and characterization of FSB@Fe3O4 composites and application in removal of indigo carmine dye from industrial wastewaters
(Springer, 2021)The syntheses and characterization of fish scale biochar magnetic composites (FSB@Fe3O4) and their applications in the removal of indigo carmine dye from effluents are described. Preparation of the fish scale biochar ... -
Synthesis of a pyrrolidine derivative of a carvotacetone and monoterpenes for anti-methicillin-resistant Staphylococcus aureus and anti-cryptococcal properties
(Taylor & Francis, 2022-05-03)Monoterpene derivatives are of great biological relevance in the pharmaceutical industry. In the present study, pyrrolidine deriva tive of a carvotacetone, 3-O-benzylcarvotacetone (1), and selected monoterpenes ... -
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 ... -
Synthesis, characterization and application of acid and alkaline activated volcanic ash-based geopolymers for adsorptive remotion of cationic and anionic dyes from water
(Elsevier, 2021)In this work, two geopolymers were prepared by acid activation (GPAc) and alkaline activation (GPAl) approaches using volcanic ash (VA) as the precursor material. The geosorbents were characterized by X-ray diffraction ... -
Synthesis, structural assignments and antiinfective activities of 3-O-benzyl-carvotacetone and 3-hydroxy-2-isopropyl-5-methyl-p-benzoquinone
(Taylor & Francis, 2021-11)In an attempt to synthesize carvotacetone analogues, new 3-O-benzyl-carvotacetone (10) and previously reported 3-hydroxy-2-isopropyl-5-methyl-p-benzoquinone (11) were synthesized from piperitone (7). In this work, we ...