PHD-Chemistry
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Recent Submissions
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Effect of Selected Bacterial Biocementation, Biodeterioration, Bioremediation on Selected Properties and Microstructure of Hydrated Cement Mortar
(Kenyatta University, 2023)Cement-made structures encounter durability and sustainability challenges. This is due to degradation by aggressive agents such as Cl-, SO42- and CO2. The presence of micro-organisms, such as Sulphur reducing bacteria (SRB) ... -
Synthesis of Super Absorbent Hydrogels Derived from Cross-Linking Activated Charcoal and Citric Acid for Sustainable Agriculture in Semi-Arid Regions
(Kenyatta University, 2022)Superabsorbent hydrogels represent a set of polymeric materials with three-dimensional structure. They are capable of holding huge amounts of water and due to the hydrophilic nature in the structure. Their applications in ... -
Microbial Effects on Physico-Mechanical and Microstructural Properties of Commercial Portland Cements
(Kenyatta university, 2022-07)Structures made using cement are prone to deterioration over time. Majority of structural failures have been attributed to inappropriate concrete mix designs, poor engineering designs, substandard aggregates, mixing water ... -
Synthesis and Spectrophotometric Activity of Phthalocyanine Conjugated to Metal Nanoparticles and Evaluation of their Antibacterial Properties
(Kenyatta University, 2021)In recent times, microbial pathogens have increasingly shown multi-drug resistance leading to a growing concern. Analysis of 624 isolates from Kenya revealed 88% of isolates tested were multi-drug resistant. It is estimated ... -
Simulated Bioaccessibility Studies of Beta-Carotene and Vitamin B Series in Selected Leafy African Indigenous Vegetables in Kisii County, Kenya
(Kenyatta University, 2021)Over two billion people worldwide are affected by various vitamin deficiencies resulting in poor health, low gross domestic product and high mortality rates. Deficiency of vitamins remain a public health problem in the ... -
Microwave Synthesis of Super-Absorbent Hydrogels from Rice Husks Cellulose for Sustainable Agriculture
(Kenyatta University, 2021)The phenomenon of climate change coupled with increased demand for water all over the world calls for innovations in water conservation and use. Moreover, rainfall variability and the corresponding implications are expected ... -
Mycotoxin Levels in Chicken Feeds and Products and Effects of Exposing Associated Fungi to Selected Plant Essential Oils in Kenya
(Kenyatta University, 2020)Mycotoxins are secondary metabolites produced by fungi. The most toxic mycotoxins are particular secondary metabolites of Penicillium, Aspergillus and Fusarium fungi species that infect a variety of human food and animal ... -
Diammonium Phosphate Fertilizer from Bone–Phosphate Enriched Phosphoric Acid and Ammonia from Lithium Nitride and its Efficacy in Tomato Growing
(Kenyatta University, 2021)obtained from finite rock phosphate is one of the essential elements for food production and modern agriculture. Therefore, for sustainability of food supply and development in agriculture, management of phosphorus is key. ... -
Synthesis, Characterization, Bioassay and Density Functional Theory Studies of Cationic Iron Half Sandwich Complexes of Selected Heterofunctional Active Pharmaceutical Agents
(Kenyatta University, 2020-02)The molecular modification of purely organic drugs by the incorporation of a metal atom is an active area of research. However, there is paucity of data in the use of half sandwich organometallic fragments and in particular ... -
Synthesis of (R)-1-Methyl-4-(1-Methylethenyl) Cyclohexene Multifunctional Derivatives and their Effects on Jatropha Curcas and Algae Biofuel Blends
(Kenyatta University, 2020-10)There is a growing increase in biofuel consumption around the world. Currently there is a desire to enhance biodiesel and biodiesel blends properties by use of multifunctional additives. This project sought to evaluate the ... -
Bioprospecting for Anti-Mosquito Phytochemicals Associated With Olfaction and Larvicidal Activities From Selected Kenyan Plants
(Kenyatta University, 2020)Mosquitoes are of high public health concern since they are significant disease vectors of different tropical and subtropical life-threatening diseases like malaria, dengue, yellow fever, chikungunya, zika virus and ... -
Biomass-Based Fertilizer Formulation Using Chemically Decomposed Agricultural Wastes and Evaluation of Its Efficacy in Growing Maize
(Kenyatta University, 2020)Utilization of the conventional fertilizers such as NPK, DAP, CAN and Urea by smallholder farmers in developing countries like Kenya has remained dismal due to high retail prices as well as environmental and soil related ... -
Structure-Activity Studies and On-Host Evaluation of Controlled-Release Formulations of Optimised Potent Repellents Against Rhipicephalus Appendiculatus
(Kenyatta University, 2020-08)East Coast Fever (ECF), commonly known as theileriosis, is a tick-borne disease caused by a protozoan organism known as Theileria parva. It has been a major limitation in livestock production and food security in several ... -
Optimization of Nutrients Release Parameters in Synthesized Hydrogel Minerals Anchored Material for Growth of Selected Plants in Embu County, Kenya
(Kenyatta University, 2020-12)Soil is the natural basis for plants growth as it not only provides support, water and minerals, but also helps to aerate the roots for proper development. However, due to the ever-growing population, available land is ... -
Nutrition-Sensitive Intervention with Selected African Indigenous Leafy Vegetables Among School-Going Children in Machakos County, Kenya
(Kenyatta University, 2020-11)The 2014 Kenya Demographic Health Survey (KDHS) and Micronutrient Survey report showed malnutrition among children aged 5-11 years in Kenya. In particular, malnutrition in Machakos County manifested as stunting (26.3 %), ...
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Effect of Selected Bacterial Biocementation, Biodeterioration, Bioremediation on Selected Properties and Microstructure of Hydrated Cement Mortar
(Kenyatta University, 2023)Cement-made structures encounter durability and sustainability challenges. This is due to degradation by aggressive agents such as Cl-, SO42- and CO2. The presence of micro-organisms, such as Sulphur reducing bacteria (SRB) ... -
Synthesis of Super Absorbent Hydrogels Derived from Cross-Linking Activated Charcoal and Citric Acid for Sustainable Agriculture in Semi-Arid Regions
(Kenyatta University, 2022)Superabsorbent hydrogels represent a set of polymeric materials with three-dimensional structure. They are capable of holding huge amounts of water and due to the hydrophilic nature in the structure. Their applications in ... -
Microbial Effects on Physico-Mechanical and Microstructural Properties of Commercial Portland Cements
(Kenyatta university, 2022-07)Structures made using cement are prone to deterioration over time. Majority of structural failures have been attributed to inappropriate concrete mix designs, poor engineering designs, substandard aggregates, mixing water ... -
Synthesis and Spectrophotometric Activity of Phthalocyanine Conjugated to Metal Nanoparticles and Evaluation of their Antibacterial Properties
(Kenyatta University, 2021)In recent times, microbial pathogens have increasingly shown multi-drug resistance leading to a growing concern. Analysis of 624 isolates from Kenya revealed 88% of isolates tested were multi-drug resistant. It is estimated ... -
Simulated Bioaccessibility Studies of Beta-Carotene and Vitamin B Series in Selected Leafy African Indigenous Vegetables in Kisii County, Kenya
(Kenyatta University, 2021)Over two billion people worldwide are affected by various vitamin deficiencies resulting in poor health, low gross domestic product and high mortality rates. Deficiency of vitamins remain a public health problem in the ... -
Microwave Synthesis of Super-Absorbent Hydrogels from Rice Husks Cellulose for Sustainable Agriculture
(Kenyatta University, 2021)The phenomenon of climate change coupled with increased demand for water all over the world calls for innovations in water conservation and use. Moreover, rainfall variability and the corresponding implications are expected ... -
Mycotoxin Levels in Chicken Feeds and Products and Effects of Exposing Associated Fungi to Selected Plant Essential Oils in Kenya
(Kenyatta University, 2020)Mycotoxins are secondary metabolites produced by fungi. The most toxic mycotoxins are particular secondary metabolites of Penicillium, Aspergillus and Fusarium fungi species that infect a variety of human food and animal ... -
Diammonium Phosphate Fertilizer from Bone–Phosphate Enriched Phosphoric Acid and Ammonia from Lithium Nitride and its Efficacy in Tomato Growing
(Kenyatta University, 2021)obtained from finite rock phosphate is one of the essential elements for food production and modern agriculture. Therefore, for sustainability of food supply and development in agriculture, management of phosphorus is key. ... -
Synthesis, Characterization, Bioassay and Density Functional Theory Studies of Cationic Iron Half Sandwich Complexes of Selected Heterofunctional Active Pharmaceutical Agents
(Kenyatta University, 2020-02)The molecular modification of purely organic drugs by the incorporation of a metal atom is an active area of research. However, there is paucity of data in the use of half sandwich organometallic fragments and in particular ... -
Synthesis of (R)-1-Methyl-4-(1-Methylethenyl) Cyclohexene Multifunctional Derivatives and their Effects on Jatropha Curcas and Algae Biofuel Blends
(Kenyatta University, 2020-10)There is a growing increase in biofuel consumption around the world. Currently there is a desire to enhance biodiesel and biodiesel blends properties by use of multifunctional additives. This project sought to evaluate the ... -
Bioprospecting for Anti-Mosquito Phytochemicals Associated With Olfaction and Larvicidal Activities From Selected Kenyan Plants
(Kenyatta University, 2020)Mosquitoes are of high public health concern since they are significant disease vectors of different tropical and subtropical life-threatening diseases like malaria, dengue, yellow fever, chikungunya, zika virus and ... -
Biomass-Based Fertilizer Formulation Using Chemically Decomposed Agricultural Wastes and Evaluation of Its Efficacy in Growing Maize
(Kenyatta University, 2020)Utilization of the conventional fertilizers such as NPK, DAP, CAN and Urea by smallholder farmers in developing countries like Kenya has remained dismal due to high retail prices as well as environmental and soil related ... -
Structure-Activity Studies and On-Host Evaluation of Controlled-Release Formulations of Optimised Potent Repellents Against Rhipicephalus Appendiculatus
(Kenyatta University, 2020-08)East Coast Fever (ECF), commonly known as theileriosis, is a tick-borne disease caused by a protozoan organism known as Theileria parva. It has been a major limitation in livestock production and food security in several ... -
Optimization of Nutrients Release Parameters in Synthesized Hydrogel Minerals Anchored Material for Growth of Selected Plants in Embu County, Kenya
(Kenyatta University, 2020-12)Soil is the natural basis for plants growth as it not only provides support, water and minerals, but also helps to aerate the roots for proper development. However, due to the ever-growing population, available land is ... -
Nutrition-Sensitive Intervention with Selected African Indigenous Leafy Vegetables Among School-Going Children in Machakos County, Kenya
(Kenyatta University, 2020-11)The 2014 Kenya Demographic Health Survey (KDHS) and Micronutrient Survey report showed malnutrition among children aged 5-11 years in Kenya. In particular, malnutrition in Machakos County manifested as stunting (26.3 %), ... -
Modified Bio-Sorbents for Pre-Concentration of Essential Trace Elements from Raw and Fermented Selected Foods
(Kenyatta University, 2020-03)This study reports a new method of pre-concentrating Zn2+, Fe2+, Mn2+, Mo6+ and I- ions present in food stuffs using modified bio-sorbents. These elements are in low levels in many food stuffs commonly consumed and some ... -
Facile Remediation of Fluoride in Aquatic Media Using Modified Polyethylene Container
(Kenyatta University, 2020-07)Development of environmentally friendly and economically viable water treatmet techniques for remediation of fluoride ions in drinking water has gained a huge research interest. Floridated water is associated with dental ... -
Bioprospecting for Anti-Mosquito Phytochemicals Associated with Olfaction and Larvicidal Activities from Selected Kenyan Plants
(Kenyatta University, 2020-01)Mosquitoes are of high public health concern since they are significant disease vectors of different tropical and subtropical life-threatening diseases like malaria, dengue, yellow fever, chikungunya, zika virus and ... -
Biomass-Based Fertilizer Formulation Using Chemically Decomposed Agricultural Wastes and Evaluation of Its Efficacy in Growing Maize
(Kenyatta University, 2020-11)Utilization of the conventional fertilizers such as NPK, DAP, CAN and Urea by smallholder farmers in developing countries like Kenya has remained dismal due to high retail prices as well as environmental and soil related ... -
Synthesis, Characterization and Evaluation of Pd–Nanoparticles Supported On Titania Nanofibers as Catalyst for Heck Reactions
(Kenyatta University, 2018-11)Selective organic transformations for most sought after aromatic carbon-carbon coupling reactions have been conventionally accomplished using homogeneous catalysts in the presence of ligands. These catalysts are known ...
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