Browsing Faculty of Natural Sciences@PUK by Title
Now showing items 223-242 of 2350
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Challenges in the potable water industry due to changes in source water quality: case study of Midvaal Water Company, South Africa
(Water Research Commission, 2016)Midvaal Water Company treats hypertrophic water abstracted from the Vaal River to supply bulk wholesome potable water to their consumers in compliance with the South African National Standard (SANS) 241:2015 for drinking ... -
Challenges to cosmic ray modeling: from beyond the solar wind termination shock
(Elsevier, 2008)Voyager 1 crossed the solar wind termination shock on December 16, 2004 at a distance of 94 AU from the Sun, to become the first spacecraft to explore the termination shock region and to enter the heliosheath, the final ... -
Chandra and HESS observations of the supernova remnant CTB 37B
(EDP Sciences, 2008)We discovered the >100 GeV γ-ray source, HESS J1713−381, apparently associated with the shell-type supernova remnant (SNR) CTB37B, using HESS in 2006. In 2007 we performed X-ray follow-up observations with Chandra with ... -
Change detection in INARCH time series of counts
(Springer, 2016)In the present paper we develop an online procedure for detecting changes in the parameters of integer ARCH models of order one. The test statistic utilizes the notion of the empirical probability generating function. The ... -
Change over three years in adolescents' physical activity levels and patterns after a physical activity intervention: play study
(Edizioni Minerva Medica, 2012)AIM: This study aimed to determine over a three-year period what the PA levels and patterns of adolescents will be after participating in a physical activity (PA) intervention. METHODS: African adolescents (158 boys, 211 ... -
Changeover-time in psychosocial wellbeing of people living with HIV and people living close to them after an HIV stigma reduction and wellness enhancement community intervention
(Taylor & Francis + NISC, 2015)HIV stigma continues to affect the psychosocial wellbeing of people living with HIV (PLWH) and people living close to them (PLC). Literature unequivocally holds the view that HIV stigma and psychosocial wellbeing interact ... -
Changes in density and composition of algal assemblages in certain unit processes of two South African water purification plants
(Taylor & Francis, 2014)The water purification plants at Virginia and Bothaville, South Africa, experience problems with cyanobacteria and other algae. Their algal assemblages were studied during 2010 and 2011 to determine the dominant species ... -
Changes in the algal composition and water quality of the Sundays River, Karoo, South Africa, from source to estuary
(Natl Inquiry Services Centre Pty Ltd, 2015)A first survey was done on algae present in the Sundays River from its source to its confluence with the sea. Species found in the upstream sections of the river included indicators of good water quality, but the quality ... -
Changes to the organic functional groups of an inertinite rich medium rank bituminous coal during acid treatment processes
(Elsevier Science, 2011)A South African inertinite rich medium rank bituminous coal was subjected to a series of acid treatment steps using concentrations of HF and HNO3 ranging between 1.5 and 4 M, temperatures between 65 and 80 °C and reaction ... -
Characterisation and liberation of chromium from fine ferrochrome waste materials
(Elsevier, 2014)Three types of generic chromium (Cr)-containing wastes are generated during ferrochrome (FeCr) production, i.e. slag, bag filter dust (BFD) and venturi sludge. Slag is by volume the largest waste; however, fine FeCr waste ... -
Characterisation of a polyaromatic PBI blend membrane for SO2 electrolysis
(Elsevier, 2015)The application of a polyaromatic acid–base blend membrane from partially fluorinated and sulfonated aromatic polyether and the polybenzimidazole F6PBI has been investigated for hydrogen production using SO2 electrolysis. ... -
Characterisation of a topotype and other populations of Hemicriconemoides strictathecatus Esser, 1960 (Nematoda: Criconematidae) from Florida with description of H. phoenicis sp. n. from the USA
(Brill Academic Publishers, 2015)The results of morphological and molecular analyses of a Florida topotype and other populations of Hemicriconemoides strictathecatus showed that this sheathoid nematode consists of two morphotypes, both with an average ... -
Characterisation of Escherichia coli O157 strains from humans, cattle and pigs in the North-West Province, South Africa
(Elsevier Science Limited, 2008) -
Characterisation of some Scutellonema species (Tylenchida: Hoplolaimidae) occurring in Botswana, South Africa, Costa Rica and the USA, with description of S. clavicaudatum sp. n. and a molecular phylogeny of the genus
(Brill, 2017)The genus Scutellonema contains more than 40 species of spiral nematodes with enlarged phasmids called scutella. In this study, we provide morphological and molecular characterisation of S. clavicaudatum sp. n., S. ... -
Characterisation of sub-micron particle number concentrations and formation events in the western Bushveld Igneous Complex, South Africa
(European Geosciences Union, 2012)South Africa holds significant mineral resources, with a substantial fraction of these reserves occurring and being processed in a large geological structure termed the Bushveld Igneous Complex (BIC). The area is also ... -
Characterisation of the influence of genetic variations on the enzyme activity of a recombinant human glycine N-acyltransferase
(Elsevier, 2013)Human glycine N-acyltransferase (human GLYAT) detoxifies a wide range of endogenous and xenobiotic metabolites, including benzoate and salicylate. Significant inter-individual variation exists in glycine conjugation capacity. ... -
Characterisation of the inorganic chemistry of surface waters in South Africa
(Water Research Commission, 2011)The main purpose of this study was to determine a simple inorganic chemistry index that can be used for all surface waters in South Africa, in order to characterise the inorganic chemistry of surface waters. Water quality ... -
Characterisation of the Woody assemblages of Zululand coastal thronveld along the Nseleni River
(South African National Parks, 2008) -
Characterisation of Xanthomonas campestris pv. campestris isolates from South Africa using genomic DNA fingerprinting and pathogenicity tests
(Springer, 2012)The genetic diversity of Xanthomonas campestris pv. campestris isolates from South Africa was evaluated using 28 isolates obtained from the Johannesburg Fresh Produce Market. Samples were collected from cabbage supplies ...
