Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 525-544 of 4822
-
The case for environmental flow determination for the Phongolo River, South Africa
(Natl Inquiry Services Centre Pty Ltd, 2015)The construction of Pongolapoort Dam in 1973 on the Phongolo River in KwaZulu-Natal, South Africa, has considerably altered the hydrological behaviour and ecological response of the downstream floodplain. Changes in the ... -
Case study of effect of glyphosate application on plant-parasitic nematodes associated with a soybean-maize rotation system in South Africa
(Taylor & Francis, 2019)Information on the effect of the herbicide glyphosate on nematodes in the field is limited and contradictory. A small field experiment was conducted during two consecutive summer-growing seasons to investigate the response ... -
Case study of postgraduate student dropout rate at South African universities
(Clute Institute, 2015)Public funding for higher education in South Africa is a significant investment. Large amounts of funds are invested in students and there is a national shortage of high quality students in scarce skills - in particular, ... -
A case study to determine the efficacy of ozonation in purification processes
(South African Water Research Commission, 2012)The aim of this study was to determine the efficacy of ozone in water purification processes at the Midvaal Water Company, which uses the hypertrophic Middle Vaal River for source water. It was found that pre- and ... -
Catalogue of snout mites (Acariformes: Bdellidae) of the world
(Magnolia Press, 2016)Bdellidae (Trombidiformes: Prostigmata) are moderate to large sized predatory mites that inhabit soil, leaves, leaf litter, and intertidal rocks. They are readily recognized by an elongated, snout-like gnathosoma and by ... -
Catalysis of linear alkene metathesis by Grubbs-type ruthenium alkylidene complexes containing hemilabile α,α-diphenyl-(monosubstituted-pyridin-2-yl)methanolato ligands
(Beilstein-Institut, 2019)Four new Grubbs-type precatalysts [RuCl(H2IMes)(O^N)(=CHPh)], where [O^N = α,α-diphenyl-(3-methylpyridin-2-yl)methanolato, α,α-diphenyl-(4-methylpyridin-2-yl)methanolato, α,α-diphenyl-(5-methylpyridin-2-yl)methanolato and ... -
The catalytic effect of Benfield waste salt on CO2 gasification of a typical South African Highveld coal
(Springer, 2019)The possible catalytic effect of a 5% loading by mass of crystallized salt from spent Benfield solution (SBFS) was investigated and compared with the catalytic influence of a 5 mass% loading of K2CO3 on the char–CO2 ... -
Catalytic oxidation of alcohols with novel non-heme N4-tetradentate manganese(II) complexes
(RSC, 2018)We report the preparation and characterisation of a series of novel non-heme N4-tetradentate Mn(OTf)2 complexes of the type, [(L)MnOTf2], where L = R,R and S,S enantiomers of BPMCN, its 6-methyl and 6-bromo derivatives as ... -
Category-based phoneme-to-grapheme transliteration
(International Speech Communication Association ( ISCA ), 2013)Grapheme-based speech recognition systems are faster to develop but typically do not reach the same level of performance as phoneme-based systems. In this paper we introduce a technique for improving the performance of ... -
Cavinula lilandae (Bacillariophyta), a new diatom species from the Congo Basin, Central Africa
(Taylor & Francis, 2013)Cavinula lilandae, a small new diatom from the Congo Basin in Central Africa, was observed in acid riverine habitats in an almost pristine tropical rain forest. It occurred in a periphytic diatom community dominated by ... -
Ce0.8Sr0.2CoxFe1-xO3-delta (x=0.2, 0.5, 0.8) - a Perovskite-type nanocomposite for application in the oxygen evolution reaction in alkaline media
(Wiley, 2020)Three perovskite‐type nanocomposites, i. e. Ce0.8Sr0.2CoxFe1‐xO3‐δ (x=0.2, CSCF1; 0.5, CSCF2; 0.8, CSCF3), were synthesized employing the sol‐gel technique, subsequent to which they were physically and electrochemically ... -
A cell viability assay to determine the cytotoxic effects of water contaminated by microbes
(Academy of Science of South Africa (ASSAf), 2013)Many South Africans do not have access to safe drinking water, so they have no alternative but to use water from contaminated sources that poses a health hazard. This poor state of affairs appears to be deteriorating. In ... -
Cell-free DNA in a three-dimensional spheroid cell culture model: a preliminary study
(Elsevier, 2017)Background Investigating the biological functions of cell-free DNA (cfDNA) is limited by the interference of vast numbers of putative sources and causes of DNA release into circulation. Utilization of three-dimensional ... -
Cell-free DNA: preanalytical variables
(Elsevier, 2015)Since the discovery of cell-free DNA (cfDNA) in human blood, most studies have focused on diagnostic and prognostic uses of these markers for solid tumors. Except for some prenatal tests and BEAMing, cfDNA analysis has not ... -
Cellular bioenergetics is impaired in patients with chronic fatigue syndrome
(PLOS, 2017)Chronic fatigue syndrome (CFS) is a highly debilitating disease of unknown aetiology. Abnormalities in bioenergetic function have been cited as one possible cause for CFS. Preliminary studies were performed to investigate ... -
Celtis sinensis Pers. (Ulmaceae) naturalised in northern South Africa and keys to distinguish between Celtis species commonly cultivated in urban environments
(AOSIS, 2018)Background: Alien Celtis species are commonly cultivated in South Africa. They are easily confused with indigenous C. africana Burm.f. and are often erroneously traded as such. Celtis australis L. is a declared alien ... -
Centaurus A: hard x-ray and high-energy gamma-ray light curve correlation
(MDPI, 2019)Centaurus A, powered by a 55 million solar mass supermassive black hole, has been intensively monitored in all accessible wavelength ranges of the electromagnetic spectrum. However, its very-high energy gamma ( γ ) ray ... -
Centaurus A: hard X-ray and soft gamma-ray lightcurve correlation
(Sissa Medialab, 2017)Centaurus A (Cen A), powered by a 55 million solar mass supermassive black hole, has been intensively monitored in all accessible wavelength ranges of the electromagnetic spectrum. However, its gamma-ray flux, both in the ... -
Central systolic pressure and a nonessential amino acid metabolomics profile: the African prospective study on the early detection and identification of cardiovascular disease and hypertension
(Wolters Kluwer, 2019)Objectives: Early-life exposures to cardiovascular risk factors may manifest as early vascular ageing, a phenomenon to which black populations are more prone. The metabolome provides insight into the current state and ... -
Centre‐based and expedition‐based (wilderness) adventure experiential learning regarding personal effectiveness: an explorative enquiry
(Taylor & Francis, 2011)The purpose of this study is to compare a centre‐based adventure programme (CBAP) with an expedition‐based wilderness programme (EBWP) with regard to personal effectiveness. In comparing these two programmes, this study ...