Faculty of Natural Sciences: Recent submissions
Now showing items 1521-1540 of 2642
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Does phylogeny have an influence on the date of first description? A comparative study of the world's fishes
(Elsevier, 2020)The process of species description is not random, and understanding the factors that influence when a species is first described (the date of first description, DoFD) allows us to target environments and/or species' traits ... -
An assessment of the influence of host species, age, and thallus part on kelp-associated diatoms
(MDPI, 2020)Diatom community composition and abundances on different thallus parts of adult and juvenile specimens of Ecklonia maxima and Laminaria pallida were examined in False Bay, South Africa, using light and scanning electron ... -
Decoding heavy metal stress signalling in plants: Towards improved food security and safety
(MDPI, 2020)The mining of heavy metals from the environment leads to an increase in soil pollution, leading to the uptake of heavy metals into plant tissue. The build-up of toxic metals in plant cells often leads to cellular damage ... -
Perinatal suicidality: Risk factors in South African women with mental illness
(OpenJournals Publishing AOSIS (Pty) Ltd, 2020)Maternal Mortality is a global health concern. The lack of suicide data, particularly in low and middle income countries, is concerning and needs to be addressed. Aim: This study assessed suicidality and associated factors ... -
Changes in mangroves at their southernmost African distribution limit
(Elsevier, 2020)Mangroves in South Africa occur at one of the most southerly locations in the world, which provides a unique opportunity to study their dynamic responses to anthropogenic and natural perturbations. The exposed high-energy ... -
Review: Acid mine drainage (AMD) in abandoned coal mines of Shanxi, China
(MDPI, 2020)Excessive exploitation and massive coal mine closures have brought about extensive goafs in Shanxi where 8780 coal mines have been abandoned in the last 20 years. Acid mine drainage (AMD) poses severe environmental impact ... -
Gene expression alterations and molecular analysis of CHEK1 in solid tumors
(MDPI, 2020)Alterations in the Checkpoint kinase (CHEK1) gene, its regulation, and the possible clinical outcomes in human solid tumors have not been previously examined. Therefore, the present study was carried out to evaluate the ... -
Development of a method to determine the cost of breast cancer treatment with chemotherapy at Groote Schuur Hospital, Cape Town, South Africa
(SAMA, 2020)There has been no comprehensive study determining the financial burden of breast cancer in the South African (SA) public sector. Objectives. To develop a method to determine the cost of breast cancer treatment with ... -
A review on crucibles for induction melting of titanium alloys
(Elsevier, 2020)This review highlights the state of art progress in crucible designs which have been identified as showing potential for induction melting three groups of titanium alloys based on the systems; Ti–Al, Ti–Ni, as well as ... -
Metal oxide (Co3O4 and Mn3O4) impregnation into S, N-doped graphene for oxygen reduction reaction (ORR)
(MDPI, 2020)To address aggravating environmental and energy problems, active, efficient, low-cost, and robust electrocatalysts (ECs) are actively pursued as substitutes for the current noble metal ECs. Therefore, in this study, we ... -
A comprehensive review on hydrogen absorption behaviour of metal alloys prepared through mechanical alloying
(MDPI, 2020)Hydride-forming alloys are currently considered reliable and suitable hydrogen storage materials because of their relatively high volumetric densities, and reversible H2 absorption/desorption kinetics, with high storage ... -
Hydrides of Laves type Ti–Zr alloys with enhanced H storage capacity as advanced metal hydride battery anodes
(Elsevier, 2020)The present work was focused on the studies of the effect of variation of stoichiometric composition of Ti–Zr based AB2±x Laves phase alloys by changing the ratio between A (Ti + Zr) and B (Mn + V + Fe + Ni) components ... -
Hollow-structured NiCoP nanorods as high-performance electrodes for asymmetric supercapacitors
(Elsevier, 2020)One-dimensional hollow-structured NiCoP nanorods are synthesized via Kirkendall effect resulting from different diffusion rates of Ni and Co ions at 350 °C, using NaH2PO2 as a phosphorization agent. Various techniques were ... -
Controlled deposition of lead iodide and lead chloride thin films by low-pressure chemical vapor deposition
(MDPI, 2020)Lead halide thin films, such as lead iodide (PbI2) and lead chloride (PbCl2), are used as precursor films for perovskite preparation, which is frequently achieved by vacuum thermal evaporation but rarely by the low-pressure ... -
Photoluminescence quenching of a novel electroconductive poly(Propylene thiophenoimine)-co-poly(ethylenedioxy thiophene) star copolymer
(MDPI, 2020)A generation 1 poly(propylene thiophenoimine)-co-poly(ethylenedioxy thiophene) (G1PPT-co-PEDOT) star copolymer, which exhibits a strong optical absorption over a broad range in the ultraviolet–visible (UV-Vis) region and ... -
Fly ash-based geopolymer building materials for green and sustainable development
(MPDI, 2020)This study reports on formulations and conditions for producing fly ash-based geopolymers with a view to showing that the compressive strength required for construction applications can be obtained without the addition of ... -
Synthesis and photovoltaics of novel 2,3,4,5-tetrathienylthiophene-co-poly(3-hexylthiophene-2,5-diyl) donor polymer for organic solar cell
(MPDI, 2021)This report focuses on the synthesis of novel 2,3,4,5-tetrathienylthiophene-co-poly(3-hexylthiophene-2,5-diyl) (TTT-co-P3HT) as a donor material for organic solar cells (OSCs). The properties of the synthesized TTT-co-P3HT ... -
Bio-synthesised black α-Cr2O3 nanoparticles; experimental analysis and density function theory calculations
(Elsevier, 2021)A selective single phase black α-Cr2O3 nanoparticles was bio-synthesised via simple straight-forward green synthesis approach. The process involves extraction of phytochemicals contained in peels of sweet potatoes. Extraction ... -
Genome sequencing of a severe acute respiratory syndrome Coronavirus 2 isolate obtained from a South African patient with Coronavirus disease 2019
(American Society for Microbiology, 2020)As a contribution to the global efforts to track and trace the ongoing coronavirus pandemic, here we present the sequence, phylogenetic analysis, and modeling of nonsynonymous mutations for a severe acute respiratory ... -
Drug resistance mutations against protease, reverse transcriptase and integrase inhibitors in people living with HIV-1 receiving boosted protease inhibitors in South Africa
(Frontiers Media S.A., 2020)The South African national combination antiretroviral therapy (cART) roll-out program started in 2006, with over 4.4 million people accessing treatment since it was first introduced. HIV-1 drug resistance can hamper the ...