Browsing Faculty of Science Engineering and Technology by Issue Date
Now showing items 161-180 of 240
-
Reproduction of Globodera pallida on tissue culture-derived potato plants and their potential use in resistance screening process.
(2019-06-17)Globodera pallida infestation on potato is responsible for huge yield losses globally. Screening of potato germplasm for resistance to the nematode at the early stages of a breeding programme can significantly enhance ... -
Salmonella enterica Serovar Typhimurium Interacts with CD209 Receptors To Promote Host Dissemination and Infection
(American Society for Microbiology, 2019-07-23)Salmonella enterica serovar Typhimurium, a Gram-negative bacterium, can cause infectious diseases ranging from gastroenteritis to systemic dissemination and infection. However, the molecular mechanisms underlying this ... -
Salmonella enterica serovar Typhimurium, a Gram-negative bacterium, can cause infectious diseases ranging from gastroenteritis to systemic dissemination and infection. However, the molecular mechanisms underlying this bacterial dissemination have yet to be elucidated. A study indicated that using the lipopolysaccharide (LPS) core as a ligand, S. Typhimurium was able to bind human dendritic cell-specific intercellular adhesion molecule-3-grabbing nonintegrin (hCD209a), an HIV receptor that promotes viral dissemination by hijacking antigen-presenting cells (APCs). In this study, we showed that S. Typhimurium interacted with CD209s, leading to the invasion of APCs and potentially the dissemination to regional lymph nodes, spleen, and liver in mice. Shielding of the exposed LPS core through the expression of O-antigen reduces dissemination and infection. Thus, we propose that similar to HIV, S. Typhimurium may also utilize APCs via interactions with CD209s as
(taylor and Francis, 2019-08-06)This study reviews the literature on the role of technology innovation in job creation through small businesses in developing countries. A sevenstep approach to the literature review is used for synthesising relevant data. ... -
Characteristics of Waste Pickers in Nakuru and Thika Municipal Dumpsites in Kenya
(Journal of Applied Science and Technology, 2019-08-21)Dumpsite waste picking is prevalent in many developing countries of which Kenya is one. Waste pickers play an important role in waste recycling by recovering and providing materials to the waste recycling industry. Aim: ... -
Rapid,Economical and selective Compexometric Determination of Iron (III) in its synthetic alloys using 3 hydroxy-3 phynyl-1-(2,4,6-tribromophynyl)
(2019-09)The present study describes a simple, selective, rapid and economical method for the determination of iron (III) in its synthetic alloys using 3-hydroxy -3- phenyl-1- (2,4,6- tribromophenyl) triazene as metallochromic ... -
Analysis of Microbial Quality of Drinking Water in Njoro Sub-county, Kenya
(2019-10)Drinking water should be free of microbial pathogens so as to be regarded as potable water and safe for drinking. However, water is prone to fecal contaminants which are the sources of gastrointestinal illnesses. In Njoro ... -
Effector gene vap1based DGGE fingerprinting to assess variation within and among Globodera species and populations.
(2019-11-12)Population-level genetic tools to study the epidemiology of potato cyst nematodes (PCN) are needed to evaluate their adaptive potential and validate management strategies. The effector gene vap1 is essential in early ... -
Crystal structure of chlorido-(η5-pentamethylcyclopenta dienyl)-((bis-pyrazol-1-yl) methane-κ2N, N′) rhodium (III) hexafluorophosphate
(2019-11-13)C17H23ClN4RhF6P, monoclinic, P21/c (no. 14), a = 10.6954(2) Å, b = 15.3868(3) Å, c = 12.6130(2) Å, β = 90.5590(10)°, V = 2075.60(7) Å3, Z = 4, Rgt(F) = 0.0296, wRref(F2) = 0.0727, T = 100(2) K. -
Status of Plasmodium Falciparum Resistance to Sulfadoxine Pyrimethamine in Kwale County, Kenya
(Epidemiology International, 2019-12)Background: Malaria persists to be one of the major significant diseases in the world. A range of antimalarial drugs are readily accessible but management of the disease remains a problem. Despite the broadened spread ... -
Reproduction and life history traits of a resistance breaking Globodera pallida population
(Society of Nematologists, 2019-12-05)The main and most efficient measure to control potato cyst nematode (PCN) is the use of resistant cultivars. German and Dutch National Plant Protection Organizations (NPPOs) recently reported the emergence of Globodera ... -
Crystal structure of η6-p-cymene-iodido- (N-isopropyl-1-(pyridin-2-yl) methanimine-κ2N, N′) ruthenium (II) hexafluorophosphate (V), C19H26IN2F6Ru
(2019-12-07)C19H26IN2F6Ru, triclinic, P1̄ (no. 2), a = 9.240(2) Å, b = 10.019(3) Å, c = 12.689(3) Å, α = 78.921°, β = 81.596(10)°, γ = 83.654°, V = 1136.30(5) Å3, Z = 2, Rgt(F) = 0.0174, wRref(F2) = 0.0440, T = 173 K. -
Crystal structure of η 6 -p-cymene-iodido-(N-isopropyl-1-(pyridin-2-yl) methanimine-κ 2N,N′)ruthenium(II) hexafluorophosphate(V), C19H26IN2F6Ru
(De Gruyter, 2019-12-07)C19H26IN2F6Ru, triclinic, P¯1 (no. 2), a = 9.240(2) Å, b = 10.019(3) Å, c = 12.689(3) Å, α = 78.921°, β = 81.596(10)°, γ = 83.654°, V = 1136.30(5) Å3 , Z = 2, Rgt(F) = 0.0174, wRref(F 2 ) = 0.0440, T = 173 K. -
Stability Analysis of the Modified Advection-Dispersion Model for Nitrate Leaching into Groundwater
(2020)Nitrogen is a vital nutrient that enhances plant growth which has motivated the intensive use of nitrogen-based fertilizers to boost crop productivity. However, Pollution by nitrate is a globally growing problem due to the ... -
Anti-inflammatory activities of dichloromethane-methanolic leaf and stem bark extracts of Ximenia americana in mice models
(2020)Introduction: Ximenia americana is a highly branched shrub mainly found in tropics of Asia, Africa, New Zealand, Central and South America among others. In most parts of Africa, X. americana is used in folklore to treat ... -
COMPLEXOMETRIC DETERMINATION OF ZINC USING HYDROXYTRIAZENE AS A METALLOCHROMIC INDICATOR
(2020)New metallochromic indicators belonging to the class of hydroxytriazenes has been evaluated for the direct complexometric determination of Zinc in the presence of diverse ions. Reagent no (i), (ii) and (iii) has been ... -
PLS Generalized Linear Regression and Kernel Multilogit Algorithm (KMA) for Microarray Data Classification Problem
(2020)This study involves the implentation of the extensions of the partial least squares generalized linear regression (PLSGLR) by combining it with logistic regression and linear discriminant analysis, to get a partial least ... -
Physicochemical Proprieties of Pond Water in the Economic Stimulus Programme (ESP) Fish Ponds in Tharaka-Nithi County, Kenya
(International Journal of Interdisciplinary Research and Innovations, 2020)In an effort to attain food security, Kenya has embraced aquaculture as one of its strategies. From 2009, the Government established thousands of fish ponds through the Economic Stimulus Programme (ESP). TharakaNithi ... -
Surface potential, fermi level and band gap energy of copper doped magnesium nickel ferrite nanoparticles
(Sami Publishing Compan, 2020)Optical, electrical, and electronic properties of materials are essential in the fabrication of electronic devices. These properties can be improved through doping and reduction of the size of a material to nanoscale. ... -
Optical and scanning kelvin probe microscopic characterization of sol-gel synthesized aluminum doped zinc cobalt ferrite nanoparticles
(academic Journals, 2020)In this work, Zn1-xCoFe2AlxO4 (x=0, 0.2, 0.4, 0.6, 0.8 and 1.0) ferrites were synthesized using the sol-gel method. XRD analysis was done and confirmed the formation of spinel structure, where the particle size and lattice ... -
Synergistic Evaluation of Selected Plant Extracts on Potency of Pyrethrins against the Maize Weevil, Sitophilus zea-mais (MOTSCH.)
(Merit Res. J. Agric. Sci. Soil Sci., 2020)The interest in utilization of botanical insecticides, particularly essential oils have become increasingly relevant in the control of insect pests. Many plant products and their bioactive compounds with repellent, antifeeding ...