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School of Pure, Applied and Health Sciences: Recent submissions

Now showing items 1-20 of 431

Isolative Synthesis and Characterization of Cellulose and Cellulose Nanocrystals from Typha angustifolia

Lynda S. Mesoppirr, Evans K. Suter, Wesley N. Omwoyo, Nathan M. Oyaro, Simphiwe M. Nelana (2024-09)

The application potential of cellulosic materials in natural composites and other fields needs to be explored to develop innovative, sustainable, lightweight, functional biomass materials that are also environmentally ...
Preparation, characterization and application of polymeric ultra-permeable biodegradable ferromagnetic nanocomposite adsorbent for removal of Cr(VI) from synthetic wastewater: kinetics, isotherms and thermodynamics

Evans Suter , Hilary Rutto , Robert Makomere , Musamba Banza , Tumisang Seodigeng , Sammy Kiambi and Wesley Omwoyo (2024-10)

Hexavalent chromium (Cr(VI)) contamination in drinking water due to industrial activities is a growing worldwide concern. Cr(VI) concentrations exceeding a few parts per billion (ppb) can cause serious health problems ...
Bagasse-Based Cellulose Nanocrystal–Magnetic Iron Oxide Nanocomposite for Removal of Chromium (VI) from Aqua Media †

Evans Suter, Hilary Rutto , Tumisangs Seodigeng , Lewis Kiambi and Wesley Omwoyo (2024-07)

This research developed a low-cost nano-bio-adsorbent using sugar cane bagasse-based nanocrystals incorporated with magnetic iron oxide nanoparticles (CNCs-MIONPs). The adsorbent demonstrated excellent Cr(VI) adsorption ...
A facile one-pot synthesis of Ag2Te nanoparticles and the fabrication of nanocomposites for the removal of chromium (VI) in wastewater

O. Sentse , T. Xaba a, N.D. Shooto , V.E Pakade , W. Omwoyo (2023-11)

The sol–gel method has been used successfully for the preparation of crystalline PVA-Ag2Te nanoparticles at room temperature using water as a solvent, PVA as a capping agent, sodium borohydride as a reducing agent, telerium, ...
FireBox and CharBoss: An alternative to open burning of woody biomass

Paul O. Oyier , Han-Sup Han , Dipita Ghosh , Nathaniel Anderson , Deborah S. Page-Dumroese , Daniel W. McCollum , Joanne M. Tirocke , Derek N. Pierson (2024-09)

Open burning is commonly used to dispose of piles of forest residues generated by forest management activities; however, this method is associated with smoke emissions and damage to forest soil. Air curtain burners ...
Investigations into the occurrence of polycyclic aromatic hydrocarbons in surface waters of the Narok and Bomet counties of Kenya

Bakari Chaka , Aloys M. Osano , Omwoyo Wesley Nyaigoti and Patricia B. C. Forbes (2024-06)

Polycyclic aromatic hydrocarbons (PAHs) are a group of emerging chemical pollutants that pose severe health challenges and toxicity to people and aquatic organisms exposed to these pollutants. This study sought to assess ...
Mutual Inhibition, Competition, and Periodicity in a Two Species Chemostat-like System

G. E. Kimathia, A. A. M. Wasikeb, G. P. Pokhariyala, (2024)
Periodicity in a Periodically Mediated Chemostatwith Allelopathic Growth Inhibition

Tinga Nyale ∗ , Adu Wasike, Makwata Harun, John Matuya (2024)
A Mathematical Model to Investigate How Vaccination Affect the Reproduction Number for COVID-19

Nandwa Khayo Geofrey∗ , Makwata Harun, Muthiga Samuel, Njuguna Edward (2024)

In this paper a mathematical model that investigates how vaccination affects the dynamics of COVID-19 was considered. More particularly the model takes into account the waning rate of immunity after vaccination as well ...
A Mathematical Model of Oxygen Dependency on Temperature and Pollutant Concentration in a River

E. Komu, A. A. M. Wasike, S. Muthiga and E. Njuguna (2024)

We formulate a model of a set of advection diffusion partial differential equations governing the concentration of pollutant and oxygen in a river. It is assumed that the concentration of dissolved oxygen is strongly ...
SPATIAL MODELING AND MAPPING OF COUNT DATA WITH CASES OF UNDERREPORTING: A CASE OF DIABETES IN KENYA

Mbeche Collins Kaba, Omondi Joseph Ouno&Okenye Justin Obwoge (2024)

Diabetes is a significant public health issue in developing countries, with an increasing burden on the healthcare system. However, accurate reporting of diabetes cases is often hindered by under-reporting, particularly ...
A Mathematical Model of Oxygen Dependency on Temperature and Pollutant Concentration in a River

E. Komu, 1A. A. M. Wasike, S. Muthiga and E. Njuguna (2024)

We formulate a model of a set of advection diffusion partial differential equations governing the concentration of pollutant and oxygen in a river. It is assumed that the concentration of dissolved oxygen is strongly ...
Periodicity in a Periodically Mediated Chemostat with Allelopathic Growth Inhibition

Tinga Nyale ∗ , Adu Wasike, Makwata Harun, John Matuya (2024)

We model a periodic chemostat with allelopathic growth inhibition. The operating parameters including the nutrient supply, washout rate and nutrient uptake function are allowed to be periodic functions of time with ...
The effect of substituents on the reactivity of dichloridotriphenylphosphinoruthenium(II) complexes: kinetic and mechanistic study

Meshack K. Sitati, Gershom Kyalo Mutua, Daniel O. Onunga, Deogratius Jaganyi & Allen Mambanda (2021)

The rates of substitution of chloro ligands from a series of ruthenium(II) complexes, [Ru(j3 -L)(PPh3)Cl2] (L ¼ 2,20 :60 ,200-terpyridine, 1; 40 -(4-methylphenyl)-2,20 :60 ,200-terpyridine, 2; 4,40 400-tri-tertbu ...
Tuning the reactivity of ruthenium(II) terpyridyl complexes using auxiliary ligands: kinetic and mechanistic studies

Gershom Kyalo Mutua, · Meshack Sitati,· Daniel O. Onunga, · Deogratius Jaganyi, · Allen Mamband (2022-07)

Substitution behavior of the labile aqua ligand in four mononuclear ruthenium(II) terpyridyl complexes with diferent auxiliary N (pyridine) (Ru1), N^N (2,2′-bipyridyl (Ru2), 2′-(2-pyridyl)quinoline (Ru3), 2,2′-biqunoline ...
Biomolecular interactions of 1,3-bis(2-arylimino)isoindolate-based palladium(II) complexes: Substitution kinetics, DNA/protein-binding, and molecular docking approaches

Daniel O. Onunga, , Reinner O. Omondi , Meshack Sitati , Gershom K. Mutua , Deogratius Jaganyi , Allen Mambanda (2023-08)

A series of 1,3-bis(2-arylimino)isoindoline Pd(II) complexes core viz.; Chlorido(1,3-bis(2-pyridylimino) isoindoline)palladium(II), Pd1, Chlorido(1,3-bis(4-methyl-2-pyridylimino)isoindoline)palladium(II), Pd2, Chlorido ...
Controlling the reactivity of [Pd(II)(N^N^N)Cl]+ complexes using 2,6-bis (pyrazol-2-yl)pyridine ligands for biological application: Substitution reactivity, CT-DNA interactions and in vitro cytotoxicity study

Daniel O. Onunga, Rajesh Bellam , Gershom K. Mutua , Meshack Sitati , Manickam D. BalaKumaran , Deogratius Jaganyi , Allen Mambanda (2020)

Four [(N^N^N)Pd(II) Cl]+ complexes [chloride-(2,2′ :6′ ,2′′ -terpyridine)Pd(II)]Cl (PdL1), [chlorido(2,6-bis(N-pyrazol-2-yl)pyridine)Pd(II)]Cl (PdL2), [chlorido(2,6-bis(3,5-dimethyl-N-pyrazol-2-yl)pyridine)Pd(II)]Cl ...
The influence of α,α′-diimine bridging ligand on the reactivity of binuclear para-cymene ruthenium(II) complexes. Kinetic, mechanistic and computational study

Gershom Kyalo Mutua⁎ , Daniel O. Onunga , Meshack Sitati , Deogratius Jaganyi,d,⁎ , Allen Mambanda (2020)

Substitution kinetics of the aqua ligands in four binuclear ruthenium(II) para-cymene complexes with different α,α′-diimine bridging ligands [2-pyridylaldazine (Ru-1), p-phenylenebis(picoline)aldimine (Ru-2), p-biphenyl ...
The rate of substitution from η6 ‑arene ruthenium(II) complexes

Meshack K. Sitati · Deogratius Jaganyi, · Allen Mambanda (2020)

The rate and mechanism of substitution in the Ru(II) complexes (C1–C6) by thiourea nucleophiles was studied at pH 2 and rate constants measured as a function of nucleophile concentrations and temperature using spectrometric ...
The reactivity of 40 -substituted terpy platinum(II) complexes with bio-relevant azole nucleophiles. A kinetic and mechanistic study

Deogratius Jaganyi ⇑ , Meshack Kituyi Sitati, Isaac Masika Wekesa (2016)

The rate of Chloride substitution from [Pt{(40 -ethylglycoxyl)-2,20 :60 ,200-terpyridine}Cl]Cl([PtCl(tpy)eg]Cl), [Pt{(40 -diethylglycoxyl)-2,20 :60 ,200-terpyridine}Cl]Cl([PtCl(tpy)deg]Cl) and [Pt{(40 -triethylgl ...

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