Faculty of Natural Sciences: Recent submissions
Now showing items 2041-2060 of 2661
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Stability of an SEIR epidemic model with indepenent stochastic perturbations
(Elsevier, 2013)For an epidemic model of the type mentioned, we prove a theorem on almost sure exponential stability of the disease-free equilibrium. For small values of the diffusion parameter, σ, we describe the stability of the disease ... -
An electrochemically active green synthesized polycrystalline NiO/MgO catalyst: Use in photo-catalytic applications
(Elsevier, 2018)For many years, research scientists have aided communities in their tremendous efforts towards environmental remediation. Due to their high physical and chemical stability, metal oxide nanoparticles (NPs) have been used as ... -
Improving maternal and reproductive health in Ethiopia
(Sage Publications, 2017)This study aimed to examine the relationship between maternal health and good quality of life in an attempt to understand the years between 2005 and 2011. Data from the Ethiopia Demographic and Health Surveys 2005 and 2011 ... -
A taxonomic revision of the Pteronia camphorate group (Astereae, Asteraceae)
(Elsevier, 2017)As a first step towards a comprehensive revision of Pteronia (Asteraceae, Astereae), we present here a taxonomic treatment of the Pteronia camphorata group, in which we recognise three species. The group includes the type ... -
Designing a course model for distance-based online bioinformatics training in Africa: the H3ABioNet experience
(Public Library of Science, 2017)Africa is not unique in its need for basic bioinformatics training for individuals from a diverse range of academic backgrounds. However, particular logistical challenges in Africa, most notably access to bioinformatics ... -
Draft Genome Sequence of Gordonia lacunae BS2T
(American Society for Microbiology, 2017)We report here the draft genome sequence of the soil bacterium Gordonia lacunae BS2T ( DSM 45085T JCM 14873T NRRL B-24551T), isolated from an estuary in Plettenberg Bay, South Africa. Analysis of the draft genome ... -
The hidden curriculum of work-based learning for pharmacy students in public sector pharmacies in South Africa
(International Pharmaceutical Federation, 2017)BACKGROUND: The work-based learning environment encompasses a dynamic space where the implementation of theoretical knowledge and skills may prove to be at odds with routine service delivery practices, known as the ... -
Managing information in education: a view from South Africa
(Emerald, 2017)PURPOSE – A three-year study of information technology and information systems management in South Africa has delivered (amongst other things) a bibliography and a new reference model. The paper aims to discuss this ... -
Calibrating photometric redshifts with intensity mapping observations
(American Physical Society, 2017)Imaging surveys of galaxies will have a high number density and angular resolution yet a poor redshift precision. Intensity maps of neutral hydrogen (HI) will have accurate redshift resolution yet will not resolve ... -
Effects of GnRH vaccination in wild and captive African Elephant bulls (Loxodonta africana) on reproductive organs and semen quality
(Public Library of Science, 2017)OBJECTIVES: Although the African elephant (Loxodonta africana) is classified as endangered by the International Union for Conservation of Nature (IUCN), in some isolated habitats in southern Africa, contraception is of ... -
Erratum to: Post-orogenic shoshonitic magmas of the Yzerfontein pluton, South Africa: the 'smoking gun' of mantle melting and crustal growth during Cape granite genesis?
(Springer Verlag, 2017)The published version of the original paper contained a Sr isotope analysis of Hornblende-pyroxene quartz monzodiorite sample H25, from the shoshonitic part of the Cambrian Yzerfontein pluton on the West Coast in South ... -
Reconstructing the deep-branching relationships of the papilionoid legumes
(Elsevier, 2013)Resolving the phylogenetic relationships of the deep nodes of papilionoid legumes (Papilionoideae) is essential to understanding the evolutionary history and diversification of this economically and ecologically important ... -
The impact of sperm DNA damage in assisted conception and beyond: recent advances in diagnosis and treatment
(Elsevier, 2013)Sperm DNA damage is a useful biomarker for male infertility diagnosis and prediction of assisted reproduction outcomes. It is associated with reduced fertilization rates, embryo quality and pregnancy rates, and higher ... -
Oestrogen, testosterone, cytotoxin and cholinesterase inhibitor removal during reclamation of sewage to drinking water
(Water Research Commission, 2013)Namibia is the driest sub-Saharan country in Africa. Namibia’s capital, Windhoek, reclaims sewage water for domestic use at the Goreangab Water Reclamation Plant (GWRP). Risks associated with sewage effluent and reclaimed ... -
The in vitro effects of artificial and natural sweeteners on the immune system using whole blood culture assays
(Taylor & Francis, 2013)This article investigates the effects of commercially available artificial (aspartame, saccharin, sucralose) and natural sweeteners (brown sugar, white sugar, molasses) on the immune system. Human whole blood cultures ... -
Annealing effect of hybrid solar cells based on poly (3-hexylthiophene) and zinc-oxide nanostructures
(Elsevier, 2013)The structural growth and optical and photovoltaic properties of the organic–inorganic hybrid structures of zinc oxide (ZnO)-nanorods/poly-3-hexylthiophene (P3HT) and two variations of organic polymer blends of ZnO/ ... -
Photosynthetic adaptation of two semi-arid species of Gethyllis (Kukumakranka) to drought-and-shade stress
(Elsevier, 2013)Gethyllis multifolia and Gethyllis villosa are winter-growing, summer-blooming, deciduous and bulbous geophytes that grow naturally in the semi-arid ‘Succulent Karoo Biome’ of South Africa. G. multifolia is threatened ... -
Nitric oxide affects salt-induced changes in free amino acid levels in maize
(Elsevier, 2013)It was assumed that salt-induced redox changes affect amino acid metabolism in maize (Zea mays L.), and this influence may be modified by NO. The applied NaCl treatment reduced the fresh weight of shoots and roots. This ... -
Graphite-anchored lithium vanadium oxide as anode of lithium ion battery
(Elsevier, 2013)Graphite-anchored lithium vanadium oxide (Li1.1V0.9O2) has been synthesized via a “one-pot” in situ method. The effects of the synthesis conditions, such as the ratio of reaction components and calcination temperature, ... -
Ethanol oxidation activity and structure of carbon-supported Pt-modified PdSn-SnO2 influenced by different stabilizers
(Elsevier, 2013)PdSn-SnO2 nanoparticles supported on Vulcan XC-72 carbon were synthesized by chemical reduction in the presence of three different stabilizing agents: ethylene diamine tetra-acetic acid (EDTA), sodium citrate (Nacitrate) ...