Browsing Faculty of Natural Sciences by Title
Now showing items 14-33 of 2567
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A new route to control texture of materials: Nanostructured ZnFe2O4 photoelectrodes
(2013)Studies were conducted to investigate the influence of deposition solution composition (methanol ≤ the deposition solvent ≤ ethanol) on their physical and chemical properties that matters in the aerosol formation and ... -
Abalone farming in South Africa: an overview with perspectives on kelp resources, abalone feed, potential for on-farm seaweed production and socio-economic importance
(Elsevier, 2006)The South African abalone cultivation industry has developed rapidly and is now the largest producer outside Asia. With a rapid decline in wild abalone fisheries, farming now dominates the abalone export market in South ... -
Abolishment of morphology‑based taxa and change to binomial species names: 2022 taxonomy update of the ICTV bacterial viruses subcommittee
(Springer, 2023)This article summarises the activities of the Bacterial Viruses Subcommittee of the International Committee on Taxonomy of Viruses for the period of March 2021−March 2022. We provide an overview of the new taxa proposed ... -
Abstractions for designing and evaluating communication bridges for people in developing regions
(ACM, 2010)This paper describes two novel abstractions that help soft- ware engineers work in developing regions to align social and technical factors when building communication systems. The abstractions extend two concepts familiar ... -
Abundance and species composition of non-geniculate coralline red algae epiphytic on the South African populations of the rocky shore seagrass Thalassodendron leptocaule M.C. Duarte, Bandeira & Romeiras
(Elsevier, 2013)Seagrasses support a great diversity of epiphytic organisms and new research has shown that non-geniculate coralline red algae are important occupiers of space on the fronds of seagrasses. Except for a few scant records, ... -
Abundance of no3 derived organo-nitrates and their importance in the atmosphere
(MPDI, 2021)The chemistry of the nitrate radical and its contribution to organo-nitrate formation in the troposphere has been investigated using a mesoscale 3-D chemistry and transport model, WRFChem-CRI. The model-measurement ... -
Accuracy of magnetic resonance imaging in detecting lumbo-sacral nerve root compromise: A systematic literature review
(BioMed Central, 2016)Background: MRI is considered to be the diagnostic tool of choice in diagnosing nerve root compromise among patients presenting with clinical suspicion of lumbo-sacral radiculopathy. There exists controversy among researchers ... -
Accurate automated quantitative imaging of tortoise erythrocytes using the NIS image analysis system
(Taylor & Francis, 2013)The standard method for assessing blood cell characteristics using an ocular micrometer is time-consuming and limited. We used the Nikon NIS Elements imaging software and May-Grünwald-Giemsa staining to determine whether ... -
Acoustic observations of jellyfish in the Namibian Benguela
(Inter-Research, 2001)Multi-frequency acoustic data (18, 38 and 120 kHz) were collected in conjunction with pelagic trawl sampling for gelatinous macrozooplankton during a cruise to the Namibian Benguela in September 1999. Sampling focused ... -
Actuation behaviour of a derivatized pyrrole accordion type polymer
(ESG, 2014)A monomer (Phenazine-2,3-diimino(pyrrole-2-yl)–PDP) derived from the condensation reaction between 2,3-diaminophenazine and a pyrrole derivative has been synthesized as a hinge molecule in the design of a zig-zag polymer. ... -
Acute toxicity studies of the South African medicinal plant Galenia africana
(Elsevier, 2018)Background: Medicinal plants are used by a large proportion of the global population as complementary and alternative medicines. However, little is known about their toxicity. G. africana has been used to treat wounds, coughs ... -
Acylation of anisole with benzoyl chloride over rapidly synthesized fly ash–based hbea zeolite
(Frontiers Media, 2021)Stable HBEA zeolite with high surface area and strong acid sites was synthesized from coal fly ash–based silica extract via indirect hydrothermal synthesis. The rapid HBEA hydrothermal crystallization times of 8, 10, and ... -
Acyldepsipeptide analogues: A future generation antibiotics for Tuberculosis treatment
(MDPI, 2022)Acyldepsipeptides (ADEPs) are a new class of emerging antimicrobial peptides (AMPs), which are currently explored for treatment of pathogenic infections, including tuberculosis (TB). These cyclic hydrophobic peptides ... -
Acylphloroglucinol derivatives from the South African helichrysum niveum and their biological activities
(MDPI, 2015)Abstract: Phytochemical investigation of aerial parts of Helichrysum niveum (H. niveum) using different chromatographic methods including semi-preparative HPLC afforded three new (1–3) and six known (4–10) acylphloroglucinols ... -
Adapting the yeast consolidated bioprocessing paradigm for biorefineries
(Green Wave Publishing of Canada, 2018)Despite decades long development, no natural or engineered organism has been isolated that can produce commodity products at the rates and yields required by industry via direct microbial conversion. However, new genomic ... -
Adapting x264 to asynchronous video telephony for the Deaf
(Telkom, 2008)Deaf people want to communicate remotely with sign language. Sign language requires sufficient video quality to be intelligible. Internet-based real-time video tools do not provide that quality. Our approach is to use ... -
Additive antibacterial activity of naringenin and antibiotic combinations against multidrug resistant Staphylococcus aureus
(Academic Journals, 2015)Methicillin-resistant Staphylococcus aureus has been causing numerous problems in the health care sector. This is mainly due to its ability to develop resistance to a number of antibiotics used to treat staphylococcal ... -
Advancements in satellite remote sensing for mapping and monitoring ofalien invasive plant species (AIPs)
(Elsevier, 2019)Detecting and mapping the occurrence, spatial distribution and abundance of Alien Invasive Plants (AIPs) have recently gained substantial attention, globally. This work, therefore, provides an overview of advancements in ... -
Advancements in the satellite sensing of the impacts of climate and variability on bush encroachment in savannah rangelands
(Elsevier, 2022)An increase in shrubs or woody species is likely, directly or indirectly, to significantly affect rural livelihoods, wildlife/livestock productivity and conservation efforts. Poor and inappropriate land use management ... -
Advances in nanotechnology towards development of silver nanoparticle-based wound-healing agents
(MPDI, 2021)Since antiquity, silver-based therapies have been used in wound healing, wound care and management of infections to provide adequate healing. These therapies are associated with certain limitations, such as toxicity, ...