Browsing Research Output by Author "10075399 - Pieters, Rialet"
Now showing items 1-20 of 23
-
Agrochemicals in freshwater systems and their potential as endocrine disrupting chemicals: a South African context
Horak, Ilzé; Horn, Suranie; Pieters, Rialet (Elsevier, 2021)South Africa is the largest agrochemical user in sub-Saharan Africa, with over 3000 registered pesticide products. Although they reduce crop losses, these chemicals reach non-target aquatic environments via leaching, spray ... -
Biological activity of traditional medicinal plants used against lymphatic filariasis in the eastern Free State
Lehasa, S.G.; Pieters, R.; Thekisoe, M.M.O.; Komoreng, L.V. (Elsevier, 2017)For centuries medicinal plants have been used for treatment of various diseases. Most frequently, the majority of people in the eastern Free State depend on traditional medicinal plants for their daily health care due to ... -
Biological toxicity estimates show involvement of a wider range of toxic compounds in sediments from Durban, South Africa than indicated from instrumental analyses
Vogt, Tash; Pieters, Rialet; Giesy, John; Newman, Brent K. (Elsevier, 2018)The toxic equivalences (TEQs) of polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) from sediment of aquatic systems in Durban, South Africa were determined in two ways: 1) TEQs of PAHs and PCBs ... -
Brominated flame retardants in wild bird eggs from the industrialised heartland of South Africa
Quinn, L.P.; Roos, C.; Pieters, R.; Bouwman, H.; Polder, A. (Taylor & Francis, 2020)Brominated flame-retardants (BFRs), including polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecane (HBCD), were analysed in 77 eggs of 13 wild bird species from Gauteng and northern Free State (the industrial ... -
A cell viability assay to determine the cytotoxic effects of water contaminated by microbes
Prinsloo, Suranie; Pieters, Rialet; Bezuidenhout, Carlos C. (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 ... -
Dioxin, furan and PCB serum levels in a South African Tswana population: comparing the polluting effects of using different cooking and heating fuels
Pieters, Rialet; Focant, Jean-François (Elsevier, 2014)In South Africa, 26–50% of households use solid fuel for cooking food and heating houses. When used as fuel, wood and chlorinated waste are known sources of polychlorinated dibenzo-para-dioxins, polychlorinated dibenzofurans ... -
Distribution profiles of selected organic pollutants in soils and sediments of industrial, residential and agricultural areas of South Africa
Kylin, Henrik; Borgen, Anders R.; Nieuwoudt, Claudine; Bouwman, Hindrik; Quinn, Laura; Pieters, Rialet (RSC Publication, 2009)Currently very little data exists on the presence of persistent organic pollutants (POPs) and polycyclic aromatic hydrocarbons (PAHs) in the South African environment. To address this data gap a preliminary study of a ... -
Experience in South Africa of combining bioanalysis and instrumental analysis of PCDD/Fs
De Vos, Jayne; Quinn, Laura; Roos, Claudine; Pieters, Rialet; Bouwman, Henk (Elsevier, 2013)We outline the experiences and the challenges of optimizing two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GCxGC-TOF-MS) in conjunction with the H4IIE-luc bio-assay for analyzing ... -
A first assessment of glyphosate, 2,4-D and Cry proteins in surface water of South Africa
Horn, Suranie; Pieters, Rialet; Bøhn, Thomas (ASSAf, 2019)Agriculture plays a vital role in the South African economy, as well as in the production of maize for food. Genetically modified maize is transformed to encode for crystalline (Cry) proteins found in Bacillus thuringiensis ... -
First report on OH-PAHs in South African Clarias gariepinus bile from an urban impacted system
Pheiffer, W.; Ikenaka, Y.; Smit, N.J.; Pieters, R.; Bortey-Sam, N. (NISC, 2018)The concentrations of selected hydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) were determined in the bile of the African sharptooth catfish Clarias gariepinus from impoundments in the urban impacted Klip River ... -
Fish consumption from urban impoundments: what are the health risks associated with DDTs and other organochlorine pesticides in fish to township residents of a major inland city
Pheiffer, Wihan; Wolmarans, Nico J.; Gerber, Ruan; Ikenaka, Yoshinori; Smit, Nico J.; Wepener, Victor; Pieters, Rialet (Elsevier, 2018)Organochlorine pesticides (OCPs) in South Africa have for the most part been banned, except dichlorodiphenyltrichloroethane (DDT) which is still used as malaria vector control. The aim of this study was to determine OCP ... -
The heron that laid the golden egg: metals and metalloids in ibis, darter, cormorant, heron, and egret eggs from the Vaal River catchment, South Africa
Van der Schyff, V.; Pieters, R.; Bouwman, H. (Springer, 2016)Metal pollution issues are afforded the highest priority in developing countries. Only one previous study has addressed metals in African bird eggs. We determined the concentration of metals and metalloids in bird eggs ... -
Impact of potential COVID-19 treatment on South African water sources already threatened by pharmaceutical pollution
Horn, Suranie; Vogt, Bianca; Pieters, Rialet; Bouwman, Hindrik; Bezuidenhout, Carlos (Wiley, 2020)AAfter a cluster of human pneumonia cases in Wuhan City (China) on 7 January 2020, a novel coronavirus, the severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2), was identified as the causative agent of the ... -
Introgression of a cry1Ab transgene into open pollinated maize and its effect on Cry protein concentration and target pest survival
Erasmus, Reynardt; Pieters, Rialet; Du Plessis, Hannalene; Van den Berg, Johnnie; Hilbeck, Angelika (Public Library of Science, 2019)In Africa, the target pests of genetically modified Bt maize are lepidopteran stem borers, notably Busseola fusca (Lepidoptera: Noctuidae). Gene flow between Bt maize hybrids and open pollinated varieties (OPVs) that do ... -
Levels of PCBs in wild bird eggs: considering toxicity through enzyme induction potential and molecular structure
Quinn, L.P.; Roos, C.; Pieters, R.; Løken, K.; Bouwman, H. (ELSEVIER, 2013)Polychlorinated biphenyls (PCBs) were analysed in wild bird eggs from industrialised areas in South Africa. The concentration, congener profile, feeding guild, potential associated risk and biology were investigated. PCBs ... -
May agricultural water sources containing mixtures of agrochemicals cause hormonal disturbances?
Horn, Suranie; Pieters, Rialet; Bohn, Thomas (Elsevier, 2020)Agricultural chemicals end up in the environment as complex mixtures and it is their combinatorial effects that need to be evaluated, rather than the traditional single effect of the active ingredients. This study emphasises ... -
Metal contamination of sediments and fish from the Vaal River, South Africa
Pheiffer, W.; Pieters, R.; Van Dyk, J.C.; Smit, N.J. (Taylor & Francis, 2014)Mining and other economic activities have led to the pollution of the Vaal River with metals of mainly industrial origin, but the consequences of this for animal and human health are unknown. Based on chemical analysis and ... -
PAHs, OCPs and PCBs in sediments from three catchments in Durban, South Africa
Vogt, T.; Pieters, R.; Newman, B.K. (NISC, 2018)Polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were analysed from sediment samples collected in 2012 from rivers, surface runoff canals and estuaries in three ... -
Pathogenic features of heterotrophic plate count bacteria from drinking-water boreholes
Horn, Suranie; Pieters, Rialet; Bezuidenhout, Carlos (IWA Publishing, 2016)Evidence suggests that heterotrophic plate count (HPC) bacteria may be hazardous to humans with weakened health. We investigated the pathogenic potential of HPC bacteria from untreated borehole water, consumed by humans, ... -
Polycyclic aromatic hydrocarbons (PAHs) in sediments from a typical urban impacted river: application of a comprehensive risk assessment
Pheiffer, Wihan; Bouwman, Hindrik; Smit, Nico J.; Pieters, Rialet; Quinn, Laura P. (Springer, 2018)Soweto and Lenasia, the most densely populated area of South Africa, is simultaneously a thriving metropolis, with a fair share of people still living in squalor conditions directly dependant on the natural resources. ...