Browsing Research Output by Author "11289856 - Barnard, Sandra"
Now showing items 1-16 of 16
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Assessing the likelihood of gene flow from sugarcane (Saccharum Hybrids) to wild relatives in South Africa
Snyman, Sandy J.; Komape, Dennis M.; Khanyi, Hlobisile; Van den Berg, Johnnie; Cilliers, Dirk; Barnard, Sandra; Siebert, Stefan J. (Frontiers Media, 2018)Pre-commercialization studies on environmental biosafety of genetically modified (GM) crops are necessary to evaluate the potential for sexual hybridization with related plant species that occur in the release area. The ... -
Biological crusts of serpentine and non-serpentine soils from the Barberton Greenstone Belt of South Africa
Venter, Arthurita; Siebert, Stefan; Rajakaruna, Nishanta; Barnard, Sandra; Levanets, Anatoliy; Peterson, Bianca; Sanko, Tomasz (Springer, 2017)Climate and geography can influence biological soil crust (BSC) community composition, but local heterogeneity in variables such as soil characteristics or microclimate gradients can also impact cryptogamic diversity. Heavy ... -
A case study to determine the efficacy of ozonation in purification processes
Morrison, S.; Venter, A.; Barnard, S. (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 ... -
Challenges in the potable water industry due to changes in source water quality: case study of Midvaal Water Company, South Africa
Janse van Rensburg, Shalene; Barnard, Sandra; Krüger, Marina (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 ... -
Comparison of phytoplankton assemblages in two differentially polluted streams in the Middle Vaal Catchment, South Africa
Janse van Rensburg, S.; Barnard, S.; Booyens, S. (Elsevier, 2019)Phytoplankton is an important role player in the ecology of rivers and streams, and sensitive to changes in water quality. This study aimed to determine how pollution influenced phytoplankton composition in two streams and ... -
The dynamics of toxic microcystis strains and microcystin production in two hypertrofic South African reservoirs
Barnard, Sandra; Conradie, Karin Ronel (Elsevier, 2012)The South African impoundments of Hartbeespoort and Roodeplaat experience excessive blooms of Microcystis species each year. Microcystins, produced primarily by strains of cyanobacteria belonging to the genera Microcystis, ... -
Evaluation of models generated via hybrid evolutionary algorithms for the prediction of Microcystis concentrations in the Vaal Dam, South Africa
Swanepoel, A.; Barnard, S.; Recknagel, F.; Cao, H. (Water Research Commission, 2016)Cyanobacteria are responsible for many problems in drinking water treatment works (DWTW) because of their ability to produce cyanotoxins that potentially can have an adverse effect on consumer health. Therefore, the ... -
The feasibility of wastewater recycling that includes residue from dissolved air flotation within a drinking water treatment plant: case study of Midvaal Water Company, South Africa
Janse van Rensburg, Shalene; Barnard, Sandra; Krüger, Marina (WRC, 2019)When purifying water for potable use, wastewater is generated, due to the class of the water treatment plant and the quality of the source water. Midvaal Water Company recycled wastewater that included residue from the ... -
Genetic diversity of vetiver isolates (Chrysopogon zizanioides/nigritanus) available in South Africa based on ITS, ndhF and rbcL sequencing analyses
Barnard, S.; Diedericks, V.; Conradie, K.R. (Elsevier, 2013)Vetiver grass (Chrysopogon zizanioides (L.) Roberty) is sterile and only regenerates vegetatively from clumps of the rootstock. Together with its vigorous and deep root system this makes it ideal for use in soil ... -
The identification of organic substances associated with freshwater Ceratium hirundinella cells
Ewerts, Hendrik; Janse van Vuuren, Sanet; Barnard, Sandra; Swanepoel, Annelie (Schweizerbart Science, 2018)Phytoplankton synthesize biomolecules through the process of photosynthesis, and the decomposition of these molecules causes odors in water. While the freshwater dinoflagellate Ceratium hirundinella is well known for causing ... -
The impact of zeta potential changes on Ceratium hirundinella cell removal and the ability of cells to restore its natural surface charge during drinking water purification
Ewerts, H.; Barnard, S.; Swanepoel, A. (RSC, 2017)Unit processes of a conventional water purification facility are designed to remove suspended material from source water (both inorganic and organic impurities). Organic substances in source water include phytoplankton ... -
Laboratory-scale simulations with hydrated lime and organic polymer to evaluate the effect of pre-chlorination on motile Ceratium hirundinella cells during conventional water treatment
Ewerts, H.; Barnard, S.; Swanepoel, A. (Water Research Commission, 2016)Algal genera such as Carteria, Chlamydomonas, Chlorogonium, Cryptomonas, Ceratium, Peridinium and Euglena are motile and may disrupt unit processes and cause water treatment problems. Algal species belonging to these ... -
Overview of the influences of mining-related pollution on the water quality of the Mooi River system's reservoirs, using basic statistical analyses and self organised mapping
Barnard, S.; Venter, A.; Van Ginkel, C.E. (South African Water Research Commission, 2013)The Mooi River catchment, in particular the Wonderfonteinspruit (WFS), has been the subject of a large number of studies regarding significant pollution sources, generally attributed to mining in the area. However, very ... -
Planktonic algae and cyanoprokaryotes as indicators of ecosystem quality in the Mooi River system in the North-West Province, South Africa
Venter, A.; Barnard, S.; Dickinson, M.A.; Janse van Vuuren, S.; Levanets, A.; Taylor, J.C. (South African Water Research Commission, 2013)An ecologically healthy Mooi River system is important for maintaining the quality of potable water of Potchefstroom and surrounding areas. However, this system is under constant threat from anthropogenic pollution arising ... -
Potential for gene transfer from Saccharum species (sugarcane)
Khanyi, H.; Barnard, S.; Siebert, S.J.; Komape, D.M.; Snyman, S.J. (Elsevier, 2017)Trait development by genetic modification (GM) technology is viewed as complementary to traditional breeding programmes in the sugarcane industry. However, before commercial release of GM sugarcane, risk assessment studies ... -
Strategies of coagulant optimisation to improve the removal of turbidity and Ceratium hirundinella cells during conventional drinking water purification
Ewerts, H.; Barnard, S.; Swanepoel, A.; Du Preez, H.H.; Janse van Vuuren, S. (IWA Publishing, 2014)The dinoflagellate, Ceratium hirundinella (C. hirundinella) cells are known to cause many problems when source water due for purification contains relatively high concentrations. The objective of this study was to investigate ...