School of Pure, Applied and Health Sciences (JA): Recent submissions
Now showing items 61-80 of 273
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A Review of Insecticidal Plant Extractsand Compoundsfor Stored Maize Protection
(IOSR Journal of Applied Chemistry (IOSR-JAC) Volume 14, Issue 10 Ser. I (October 2021), PP 23-37, 2021)Insect pests cause significant losses to maize grains both in the fieldsand in storage. Maize weevil (Sitophilus zeamais) and larger grain borer (Prostephanus truncatus) are among the most destructive pests of maize in ... -
Insecticidal Drimane Sesquiterpenes from Warburgia ugandensis against Maize Pests
(2021)Sitophilus zeamais and Prostephanus truncatus, the destructive pests of maize in Africa, cause extensive tunneling in maize grain leading to conversion of maize grain into flour within a very short time. Small-scale farmers ... -
Analgesic Activity of Conyza Floribunda Extracts in Swiss Albino Mice
(2021-06-30)Traditional medicine still plays an important role in managing infections especially in Africa. Extracts of Conyza floribunda Kunth are used to treat sore throat, ringworm and other skin related infections, toothache and ... -
Threats of Land Use Changes on Wetland and Water Areas of Murang’a County, Kenya
(2021-06)Globally, wetlands have declined in area by over 50% since 1900, due to changes in land-use patterns, converting them into farmlands, human settlements, urban centers, and infrastructure development. Land-use changes also ... -
Modeling Infant Mortality Risk Factors using Logistic Regression Model and Spatial Analysis in Kenya
(Asian Journal of Probability and Statistics, 2021)Globally, infant mortality is used as an important indicator for healthcare status hence an important tool for evaluation and planning of public health strategies. Despite of numerous interventions by governments aimed at ... -
A Review of Biological Activities and Phytochemistry of Rhus Species
(2021-04)The genus Rhus (family: Anacardiaceae, order: Sapindales) consists of more than 250 species distributed in the tropics, subtropics and temperate regions. Traditionally, extracts and products from Rhus species are regarded ... -
The effect of habitat type on population distribution and abundance of Rothschilds Giraffe (Giraffa camelopardalis rothschildi) in Ruma National Park and Mwea National Reserve in Kenya
(2021-05)The Rothschilds giraffe is currently listed as vulnerable by the International Union for Conservation of Nature (IUCN). This is attributed to the loss of habitat due to human activities. This study examined the effect of ... -
Effects of selenium concentration in the precursor solution on the material properties of cadmium selenide flower-like nanoparticles
(Springer, 2018-12)CdSe flower-like nanorods (NRs) were successfully synthesized by Sol–gel technique where a simple aqueous technique was applied. The effects of different selenium (Se) concentration in the precursor solution on the material ... -
Structural and optical properties of novel CdSe nanoparticles produced via a facile synthetic route: Studies on the effects of cadmium sources
(2019-04)We report on the successful synthesis of CdSe nanoparticles (NPs) via a facile aqueous approach. Investigation on the effects of various cadmium sources in the precursor solution on the CdSe NPs is discussed. The structural ... -
A comparison investigation of optical, structural and luminescence properties of CdOxTe1−x and CdTexSe1−x nanoparticles prepared by a simple one pot method
(Elsevier, 2018-04)We present L-cysteine capped CdOXTe1−X and CdTeXSe1−X nanoparticles (NPs) prepared in one pot. The as-prepared CdOXTe1−X NPs were found to have a hexagonal crystal structure of CdTe with a cubic phase of CdO. There was, ... -
Effect of growth temperature on the structural, optical and luminescence properties of cadmium telluride nanoparticles
(2018-01)Cadmium telluride (CdTe) has been successfully prepared by a simple wet chemical process at different reaction temperatures. Temperature is one parameter that thermodynamically plays an important role in controlling the ... -
Effects of precursor pH on structural and optical properties of CdTe quantum dots by wet chemical route
(2018-07)l -cysteine capped CdTe quantum dots (QDs) were synthesized in aqueous solution in open air. In order to improve the crystallinity of the CdTe QDs, synthesis conditions were optimized. Effects of different solution pH were ... -
Structural, optical and luminescence properties of CdTe quantum dots: Investigation on the effect of capping ligand ratio
(IOP Publishing Ltd, 2019-03)Well-crystallized cadmium telluride quantum dots (CdTe QDs) were fabricated by a simple wet chemical process under open air condition at a growth temperature of 100 °C. Various amounts of the capping ligands were used in ... -
Capping Ligand Influence on the Structural, Optical and Luminescence Properties of CdTe Nanoparticles Prepared by a Simple Wet Chemical Process
(2019-03)The nature of the capping ligands used and the strength of their interactions with the surface atoms of the nanoparticles (NPs) impact greatly on the material properties and the stability of the resulting NPs. The structural ... -
The influence of reaction times on structural, optical and luminescence properties of cadmium telluride nanoparticles prepared by wet-chemical process
(2016-01)This paper explains one pot synthesis of type II water soluble L-cysteine capped cadmium telluride (CdTe) core shell quantum dots using cadmium acetate, potassium tellurite and L-cysteine as the starting materials. The ... -
High luminescent L-cysteine capped CdTe quantum dots prepared at different reaction times
(2017-07)This paper reports a facile synthesis route of high luminescent L-cysteine capped CdTe quantum dots (QDs). The effect of reaction time on the growth mechanism, optical and physical properties of the CdTe QDs was investigated ... -
Optimization of Split-Plot Design in the Context of Mixture Process Variable Settings
(2021-04)In the presence of process variables, a mixture design has become well-known in statistical modeling due to its utility in modeling the blending surface, which empirically predicts any mixture's response and serves as the ... -
Time series analysis of air pollution trends in Kenya using environmental Kuznets curve
(2020-12)Air pollution occurs when harmful or excessive quantities of substances including gases are introduced into Earth's atmosphere. It may cause diseases, allergies and even death to humans; it may also cause harm to other ... -
Time series analysis of Nandi county government revenue using seasonal autoregressive integrated moving average (SARIMA) model
(2020-10)In Kenya, there are two levels of government namely the National Government (NG) and County Governments (CGs). NG’s revenue is mainly from taxation, borrowing, and grants among other sources while CGs rely on allocation ... -
Extended Cox Model on Duration Taken to Release Cargo at Kenyan Border Entry Point: A Case Study of Malaba Osbp
(Science and Education Publishing, 2020-11)Duration taken to release cargo is one of World Customs Organisation’s most significant instruments of measuring trade facilitation. It is a way of reviewing clearance procedure by measuring the time taken to release cargo ...
