Browsing Faculty of Natural and Agricultural Sciences by Title
Now showing items 573-592 of 4825
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Changes in the algal composition and water quality of the Sundays River, Karoo, South Africa, from source to estuary
(Taylor & Francis, 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 induced by atrazine in Clarias gariepinus provide insight into alterations in ovarian histoarchitecture and direct effects on oogenesis
(Taylor & Francis, 2020)Clarias gariepinus juveniles were exposed to environmentally relevant concentrations of 0 (control), 2.5, 25, 250 and 500 μg L−1 atrazine in a quality-controlled 28-day laboratory procedure. Findings revealed a significant ... -
Changes to the organic functional groups of an inertinite rich medium rank bituminous coal during acid treatment processes
(Elsevier, 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 ... -
The Chaplygin gas as a model for modified teleparallel gravity?
(Springer, 2019)This paper explores the possibility of treating the exotic Chaplygin-gas (CG) fluid model as some manifestation of an f(T) gravitation. To this end, we use the different cosmological CG equations of state, compare them ... -
Chaplygin-gas solutions of f(R) gravity
(World Scientific Publishing, 2016)We explore exact f(R) gravity solutions that mimic Chaplygin-gas inspired CDM cosmology. Starting with the original, generalized and modified Chaplygin gas equations of state, we reconstruct the forms of f(R) Lagrangians. ... -
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 and photocatalytic assessment of TiO2 nano-polymorphs: influence of crystallite size and influence of thermal treatment on paint coatings and dye fading kinetics
(Elsevier, 2019)A study on the thermal effects on TiO2 rutile and anatase nano-powders was undertaken and displayed some unusual photoactivity and crystal structure properties. Rutile nano-particles with different crystallite sizes were ... -
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 ambient Total Gaseous Mercury concentrations over the South African Highveld
(Elsevier, 2019)Mercury is considered a ubiquitous, toxic, and global pollutant. In this study, ambient Total Gaseous Mercury (TGM) concentrations over the South African Highveld are characterised. Studies on ambient mercury in this region ... -
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
(EGU, 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 ... -
Characterising non-structural protein NS4 of African horse sickness virus
(Public Library of Science, 2015)African horse sickness is a serious equid disease caused by the orbivirus African horse sickness virus (AHSV). The virus has ten double-stranded RNA genome segments encoding seven structural and three non-structural proteins. ... -
Characterising particulate organic nitrogen at a savannah-grassland region in South Africa
(MDPI, 2019)Although atmospheric organic N compounds are considered to be important, especially in new particle formation and their contribution to brown carbon, these species are not that well understood. This can be partially ...