Faculty of Natural and Agricultural Sciences
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Recent Submissions
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Itraconazole and thiophanate-methyl fail to clear tadpoles naturally infected with the hypervirulent lineage of Batrachochytrium dendrobatidis
(Inter-Research, 2018)The emerging infectious disease chytridiomycosis, caused by the fungus Batrachochytrium dendrobatidis, is a major driver pushing many amphibian species to the brink of extinction. Substantial efforts to develop effective ... -
The cosmological perturbed lightcone gauge
(MDPI, 2018)The lightcone gauge is a set of what are called the observational coordinates adapted to our past lightcone. We develop this gauge by producing a perturbed spacetime metric that describes the geometry of our past lightcone ... -
The identification of organic substances associated with freshwater Ceratium hirundinella cells
(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 ... -
Exploring contingent convertible bond alternatives for African banks
(AOSIS, 2018)Background: A variant of the contingent convertible bond, first proposed in 2011, is investigated: the Call Option Enhanced Reverse Convertible (COERC). Although issued as a bond, it converts to new shareholder’s equity ... -
Performance of two zero-cost derivative strategies under different market conditions
(Taylor & Francis, 2018)Zero-cost collars are option-based strategies which—by matching prices received and paid for the component derivatives—provide costless protection for stock or index investments. The investors’ risk appetite determines ... -
Change in dominance determines herbivore effects on plant biodiversity
(Nature, 2018)Herbivores alter plant biodiversity (species richness) in many of the world’s ecosystems, but the magnitude and the direction of herbivore effects on biodiversity vary widely within and among ecosystems. One current theory ... -
An assessment of applicability of existing approaches to predicting the bioaccumulation of conventional substances in nanomaterials
(Setac, 2018)The experimental determination of bioaccumulation is challenging, and a number of approaches have been developed for its prediction. It is important to assess the applicability of these predictive approaches to nanomaterials ... -
The evolution of UDP-glycosyl/glucuronosyltransferase 1E (UGT1E) genes in bird lineages is linked to feeding habits but UGT2 genes is not
(PLoS, 2018)UDP-glycosyltransferase (UGT) catalyzes the transfer of glycosyl groups (e.g., glucuronic acid) to exogenous or endogenous chemicals and plays an important role in conjugation reactions. In vertebrates, UGT genes are ... -
Diversifying into the branches: species boundaries in African green and bush snakes, Philothamnus (Serpentes: Colubridae)
(Elsevier, 2019)The African green and bush snakes of the genus Philothamnus currently comprises 21 species and three subspecies and occurs throughout sub-Saharan Africa. The genus has been the subject of previous taxonomic revisions based ... -
Bioaccumulation and trophic transfer of total mercury in the subtropical Olifants River Basin, South Africa
(Elsevier, 2019)The present study describes total mercury (THg) levels in surface water, sediment and biota from the Olifants River Basin (ORB) (South Africa) and investigates the trophic transfer of THg by means of trophic magnification ... -
In situ capturing and absorption of sulfur gases formed during thermal treatment of South African coals
(ACS, 2018)The objective of this study, the first of its kind on these specific South African low-sulfur coals, was to capture H2S and SO2 produced under inert and oxidizing conditions from sulfur compounds present in the coals. The ... -
Hybrid DFT study of MWCNT/Zr-doped SrTiO3 heterostructure: hydrogen production, electronic properties and charge Carrier mediator role of Zr4+ ion
(Elsevier, 2018)Over the past decade, remarkable efforts have been made to design low-cost, non-toxic, stable and efficient photocatalyst for water splitting. In the present work, an effective alternative approach to enhance hydrogen ... -
Bootstrap maximum likelihood for quasi-stationary distributions
(Taylor & Francis, 2018)Quasi-stationary distributions have many applications in diverse research fields. We develop a bootstrap-based maximum likelihood (BML) method to deal with quasi-stationary distributions in statistical inference. To ... -
Size-resolved characteristics of inorganic ionic species in atmospheric aerosols at a regional background site on the South African Highveld
(Springer, 2018)Aerosols consist of organic and inorganic species, and the composition and concentration of these species depends on their sources, chemical transformation and sinks. In this study an assessment of major inorganic ions ... -
Simulating effects of aerosols on rainfall in southern Africa
(Springer, 2018)Climate-aerosol model ECHAM5-HAM is employed to study effects of aerosol air pollution on rainfall in southern Africa. Aerosols effect the climate through light scattering and absorption, modification of cloud properties, ... -
Seasonal influences on surface ozone variability in continental South Africa and implications for air quality
(EGU, 2018)Although elevated surface ozone (O3) concentrations are observed in many areas within southern Africa, few studies have investigated the regional atmospheric chemistry and dominant atmospheric processes driving surface O3 ... -
Review of the Cirolana ‘pleonastica-group’ (Crustacea: Isopoda: Cirolanidae) with description of four new species from the Indo- Malaysian region
(National University of Singapore, 2018)Four new species and Cirolana curtensis Bruce, 1986, all of the here diagnosed Cirolana ‘pleonasticagroup’ (previously known as Cirolana ‘tuberculate-group’), are described and redescribed from Singapore, Indonesia, and ... -
Challenges and emerging solutions to the land-based plastic waste issue in Africa
(Elsevier, 2018)In recent years, there has been a tremendous increase in work that focuses on the amount and types of waste entering the marine environment from multiple geographies around the world. To date, however, there are few reports ... -
Revision of the family Carabodidae (Acari: Oribatida) XVI. Synkrotima tsalakpmenoi sp. nov. from Zimbabwe and Kenya, and Congocepheus thailandae sp. nov. from Thailand, including a complementary study of Cavaecarabodes hauseri (Mahunka 1989)
(Magnolia Press, 2018)Synkrotima tsalakpmenoi sp. nov. is described from material collected in Zimbabwe and Kenya. This species presents the following characteristics: notogastral integument formed by longitudinally aligned cuticular cords; ... -
Global analysis of continental boundary layer new particle formation based on long-term measurements
(EGU, 2018)Atmospheric new particle formation (NPF) is an important phenomenon in terms of global particle number concentrations. Here we investigated the frequency of NPF, formation rates of 10 nm particles, and growth rates in ...
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