School of Pure, Applied and Health Sciences (JA): Recent submissions
Now showing items 121-140 of 265
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Nitrogen-Doped Carbon Nanotubes Synthesised by Pyrolysis of (4-{[(Pyridine-4-yl)methylidene]amino}phenyl)ferrocene
(Hindawi Publishing Corporation, 2013-08-13)Nitrogen-doped carbon nanotubes (N-CNTs) were synthesized by pyrolysis of (4-{[(pyridine-4-yl)methylidene]amino}phenyl) ferrocene in a solution of either acetonitrile or toluene as carbon source. This was achieved by testing ... -
A review on carbon nanotube/polymer composites for organic solar cells
(John Wiley & Sons, Ltd., 2014-04-13)Carbon nanotubes (CNTs) have unique properties, such as their electrical conductivity, that enable them to be combined with conducting polymers to form composites for use in organic solar cells (OSCs). It is envisaged that ... -
Species composition and distribution of mayflies (Ephemeroptera) in relation to land use systems along the Thika River, Kenya
(Taylor & Francis Group, 2021-02-26)Mayflies (order Ephemeroptera) are widely distributed and commonly used in biological assessment of water quality because of their sensitivity. Their application as bio-indicators in tropical streams and rivers, however, ... -
Effect of Acid Treatment on the Chemical Properties of Clays from Selected Sites in Murang’a and Nyeri counties, Kenya
(2020-11-30)Assessing improvement on the quality of clay has been conducted by treatment with different concentrations of hydrochloric and oxalic acid. This project intended to assess the effect of acid treatment on the elemental ... -
Insecticidal Activity of Ocimum Suave Willd Extracts and Compounds against Sitophilus Zeamais Motschulsky
(2020-11-28)Insect pests cause significant loss of maize production in Africa. Among pests of maize, beetles are the most important, with the maize weevil (Sitophilus zeamais Motsch.) and the larger grain borer (Prostephanus truncatus ... -
Mosquitoes composition, abundance and distribution in swampy and flooded shoreline habitats of Lake Baringo, Kenya, during a period of extreme flooding (2012-2013)
(2020-10)Mosquito ecology is influenced by wetness in the environment. In 2011-2014, a rise in waters of Lake Baringo resulted in unprecedented flooding that inundated over 88km2 of the shoreline. A longitudinal study carried out ... -
Evaluation of Warburgia ugandensis Extracts and Compounds for Crop Protection against Prostephanus truncates
(2020-11)Insect pests cause a significant loss of maize production in Africa. Maize weevil (Sitophilus zeamais Motchulsky) and the larger grain borer (Prostephanus truncatus Horn) are the most destructive insect pests of maize. ... -
Insecticidal Activity of Elaeodendron schweinfurthianum Extracts and Compounds against Sitophilus zeamais Motschulsky
(2020-11)Agricultural production is constrained by pests which cause serious post-harvest losses in African. Maize weevil (Sitophilus zeamais Motschulsky) is one of the most destructive insect pests of maize. Effective synthetic ... -
Copper Extraction Using Aluminum in Acidic Leachate Media
(IISTE, 2020)Copper is found in several minerals with varied elemental composition. For instance, copper minerals occur as chalcopyrite (CuFeS2), bornite (Cu5FeS4), chalcocite (Cu2S), covellite (CuS), cuprite oxide (Cu2O), and malachite ... -
Impure Hydrazone Preparation from Chicken Dung
(IISTE, 2020-09-30)Hydrazones are strong reducing agents. Some hydrazones like hydrazine are is highly toxic and unstable and are therefore found dissolved in water. Chicken dung contains amines and uric acid that are potential sources of ... -
Antimycobacterial Activity, Cytotoxicity and Phytochemical Screening of Organic Extracts of Commiphora Africana Stem Bark from Kenya
(East African Scholars Publisher, 2020-04)Tuberculosis (TB) is a communicable disease that kills approximately three million people annually. Efforts to treat the disease have been made difficult due to the development of drug-resistant strains and co-infection ... -
Characterization of Immunogenic Soluble Crude Proteins from Biomphalaria Pfeifferi Against Schistosoma mansoni
(2020-06-30)Schistosomiasis is the second most prevalent tropical disease in the world after malaria. Chemotherapy and molluscicides which are the main methods of control do not give lasting protection as the disease continues to ... -
Effectiveness of community health workers in improving early initiation and exclusive breastfeeding rates in a low-resource setting: A cluster-randomized longitudinal study
(Wiley Periodicals, Inc., 2020-04)Little evidence exists in Kenya on the potential of community health workers (CHWs) in promoting exclusive breastfeeding (EBF) and early breastfeeding initiation (EBI) in resource‐restricted settings where very low EBF ... -
Chemical composition and repellency of Nigella sativa L. seed essential oil against Anopheles gambiae sensu stricto
(2020-04)Malaria which is caused by the Plasmodium parasite and transmitted through bites of infected female Anopheles mosquitoes is an important public health concern in Africa. Insect repellents are commercially available but ... -
Repellent Properties of Compounds and Blends from Nigella sativa Seeds Against Anopheles gambiae
(Scientific & Academic Publishing, 2020-02)Malaria, transmitted to humans by the bites of infected Anopheles mosquitoes is a public health concern. Some available repellents against the insect have adverse effects on humans and environment. This study determined ... -
Flavonol glycosides with insecticidal activity from methanol extract of Annona mucosa Jacq. leaves
(2019-12)Three flavonoids, quercetin 3-O-β-D-glucoside (1), quercetin 3-O-α-Darabinoside (2) and kaempferol 3-O-β-D-galactoside (3) were isolated from the methanol extract of the leaves of Annona mucosa Jacq. Their structures were ... -
Monitoring the extraction of copper from chicken dung leachate using an aluminium electrode as an indicator
(Elsevier Ltd., 2019-11)Copper is found in several minerals in the earth's crust with varying the elemental and mineralogical composition.Several techniques of extraction have been investigated all in the effort of obtaining a cheaper and viable ... -
Some Antibacterial and Antifungal Compounds from Root Bark of Rhus natalensis
(Scientific & Academic Publishing, 2019-09)Phytochemical studies on Rhus natalensis root bark collected from Iten, Kenya led to isolation and characterization of five compounds namely epicatechin (1), 3-sitosterol (2), 3-sitosterol glucoside (3),stigmasterol (4) ... -
Characterization of Clays from selected sites for Refractory Application
(2019-11)Clay is a stony or earthy mineral aggregate composed of fine-grained minerals, which are plastic at appropriate water content and hardens up when fired. Clay soils have various mineral groups such as kaolinite, smectites, ... -
Antimicrobial Activity of Root Bark Extracts of Rhus natalensisa and Rhus ruspolii
(Scientific & Academic Publishing, 2019-08)Bacteria and fungi are frequent causes of serious opportunistic infections worldwide. Several effective antibiotic drugs are in the market. However, drug-resistance, side effects and cost of such antibiotics limits their ...
