Browsing Research Output by Author "11935952 - Claassens, Sarina"
Now showing items 1-20 of 26
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Aflatoxins in the soil ecosystem: an overview of its occurrence, fate, effects and future perspectives
Fouché, Tanya; Claassens, Sarina; Maboeta, Mark (Springer, 2020)Aflatoxins are secondary metabolites produced by specific strains of fungi, especially Aspergillus spp. These natural toxins are mainly found in soil, decaying vegetation and food storage systems and are particularly ... -
Application of evolutionary algorithms to develop a rule set for assessing the rehabilitation status of asbestos mines in South Africa
Bezuidenhout, J.J.; Liebenberg, D.; Claassens, S.; Van Rensburg, L. (Springer Link, 2013)Asbestos mining has left a legacy of pollution in former mining areas that continues to negatively affect both the environment and local communities. In 2007, the Rehabilitation Prioritisation Index was developed as a ... -
An application of space-for-time substitution in two post-mining chronosequences under rehabilitation
Claassens, Sarina; Maboeta, Mark Steve; Van Rensburg, Leon; Jansen van Rensburg, Petrus Johannes (Taylor & Francis, 2011)Long-term monitoring of post-mining rehabilitation is inherently difficult and cannot be replicated, making the application of traditional experimental and statistical approaches for quantitative assessment of rehabilitation ... -
Bacillus-based bionematicides: development, modes of action and commercialisation
Engelbrecht, Gerhard; Horak, Ilze; Jansen van Rensburg, Peet J.; Claassens, Sarina (Taylor & Francis, 2018)Agricultural crops are severely damaged by root-knot nematodes causing extensive financial losses globally. Historically, agrochemicals have been the preferred method to combat these pests; however, threats to humans and ... -
Can a metabolomics-based approach be used as alternative to analyse fatty acid methyl esters from soil microbial communities?
Willers, Clarissa; Jansen van Rensburg, Peet J.; Claassens, Sarina (Elsevier, 2016)Modern high-throughput approaches such as metabolomics, holds promise for investigating microbial communities. This study evaluated the quantitative and qualitative data generation potential of a metabolomics-based approach ... -
A comparison of microbial community function and structure in rehabilitated asbestos and coal discard sites
Claassens, Sarina; Jansen van Rensburg, Peet; Liebenberg, Danica; Van Rensburg, Leon (Springer, 2012)Previous studies have made some progress with the use of microbial community properties as assessment criteria for rehabilitation success of postmining areas. Currently, there is a need for reference ranges of specific ... -
Ecotoxicological assessment of chemical fumigants utilising an earthworm (Eisenia andrei) bioassay and soil microbial communities
Fouché, Tanya C.; Claassens, Sarina; Maboeta, Mark S. (Springer, 2017)Fumigation is an important crop protection practice employed to control soil pathogens and diseases. Metham sodium and cadusafos are two commonly used soil fumigants for this purpose. However, little information is available ... -
Ecotoxicological effects of aflatoxins on earthworms under different temperature and moisture conditions
Fouché, Tanya; Claassens, Sarina; Maboeta, Mark Steve (MDPI AG, 2022)Aflatoxin contamination remains one of the most important threats to food safety and human health. Aflatoxins are mainly found in soil, decaying plant material and food storage systems and are particularly abundant during ... -
The effect of a medic-wheat rotational system and contrasting degrees of soil disturbance on nematode functional groups and soil microbial communities
Habig, Johan; Claassens, Sarina; Labuschagne, Johan; Marais, Mariette; Swart, Antoinette (Elsevier, 2018)During a four-year cropping cycle, the effects of cropping sequence (wheat-medic rotation and wheat monocropping) and contrasting degrees of soil disturbance (conventional tillage and zero tillage) on nematode functional ... -
Effect of biofumigants on soil microbial communities and ecotoxicology of earthworms (Eisenia andrei)
Fouché, Tanya; Maboeta, Mark; Claassens, Sarina (Springer, 2016)Biofumigation is considered a good alternative to chemical fumigation because it can control crop pathogens and diseases with lower health and environmental risks than chemical fumigants. Glucosinolates are volatile compounds ... -
The effect of canola (Brassica napus) as a biofumigant on soil microbial communities and plant vitality: a pot study
Potgieter, Clarissa; De Beer, Misha; Claassens, Sarina (Taylor & Francis and NISC, 2013)Canola (Brassica napus) may be incorporated into soil as a biofumigant for control of pathogens such as Sclerotinia sclerotiorum. Yet, the effect of biofumigants on natural microbial communities required to maintain soil ... -
Effect of vermicompost on soil and plant properties of coal spoil in the Lusatian Region (Eastern Germany)
Claassens, Sarina; Van Rensburg, Leon; Nada, Wael M.; Blumenstein, Oswald (Taylor & Francis, 2011)This study was conducted to evaluate the effect of different wood vermicompost application rates on some soil physical and chemical properties as well as on growth parameters of a grass seed mixture (RSM 7.2.1) in tertiary ... -
Evaluation of organic matter stability in wood compost by chemical and thermogravimetric analysis
Nada, W.M.; Van Rensburg, L.; Claassens, S.; Blumenstein, O.; Friedrich, A. (University of Tehran (Graduate Faculty of Environment), 2012)This study investigated maturation and stability levels during composting of Quercus robur (QR) woodchips mixed with different nitrogen sources (horse manure, HM and lake mud, LM) for potential agronomic utilisation. The ... -
Foraging at wastewater treatment works affects brown adipose tissue fatty acid profiles in banana bats
Hill, Kate; Van Aswegen, Sunet; Claassens, Sarina; Jansen van Rensburg, Peet; Schoeman, M. Corrie (Company of Biologists, 2016)In this study we tested the hypothesis that the decrease in habitat quality at wastewater treatment works (WWTW), such as limited prey diversity and exposure to the toxic cocktail of pollutants, affect fatty acid profiles ... -
Gut microbiota of Busseola fusca (Lepidoptera: Noctuidae)
Snyman, Maxi; Gupta, Arvind Kumar; Bezuidenhout, Cornelius Carlos; Claassens, Sarina; Van den Berg, Johnnie (Springer, 2016)Busseola fusca (Fuller) (Lepidoptera: Noctuidae) is a stemborer pest that attacks maize (Zea mays) throughout sub-Saharan Africa. Genetically modified maize has been shown to be effective against B. fusca. However, resistance ... -
In vitro bioassays to determine the effect of Bacillus soli filtrates on the paralysis of Meloidogyne incognita second-stage juveniles
Engelbrecht, Gerhard; Jansen van Rensburg, Peet J.; Fourie, Hendrika; Claassens, Sarina (Brill, 2020) -
In vitro evaluations to determine the effect of Bacillus firmus strains on the motility of Meloidogyne incognita second-stage juveniles
Jansen-Girgan, Chantelle; Claassens, Sarina; Fourie, Hendrika (Springer, 2016)Eco-friendly control strategies, such as biological agents containing Bacillus firmus, are known to adversely impact the biology of Meloidogyne incognita and other nematode pests that damage agricultural crops. The efficacy ... -
Insights and lessons learned from the long–term rehabilitation of an iron ore mine
Liebenberg, D.; Claassens, S.; Van Rensburg, L. (Graduate Faculty of Environment, 2013)A long-term study was conducted between 1985 and 2003 on rehabilitation trials at Sishen Iron Ore Mine, South Africa, to identify grass species that would survive in the artificial growth medium applied to the sites, and ... -
Microbial metabolomics: essential definitions and the importance of cultivation conditions for utilizing Bacillus species as bionematicides
Horak, I.; Engelbrecht, G.; Jansen van Rensburg, P.J.; Claassens, S. (Wiley, 2019)Root‐knot nematodes are destructive phytopathogens that damage agricultural crops globally, and there is growing interest in the use of biocontrol based on rhizobacteria such as Bacillus to combat Meloidogyne species. It ... -
Microbial signature lipid biomarker analysis: an approach that is still preferred, even amid various method modifications
Willers, C.; Jansen van Rensburg, P.J.; Claassens, S. (Wiley, 2015)The lipid composition of microbial communities can indicate their response to changes in the surrounding environment induced by anthropogenic practices, chemical contamination or climatic conditions. A considerable number ...