Browsing Faculty of Natural Sciences by Title
Now showing items 4-23 of 908
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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 ... -
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, ... -
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 ... -
Active Principles of Tetradenia riparia; II. Antispasmodic Activity of 8(14), 15-Sandaracopimaradiene-7α, 18-diol
(Georg Thieme Verlag, 1987)Tetradenia riparia is one of the most popular medicinal plants in Rwanda. Previously, several new substances have been isolated from the leaves, including a new diterpenediol, i.e. 8(14),15-sandaracopimaradiene-7α,18-diol. ... -
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 pharmacokinetics of first line anti-tuberculosis drugs in patients with Pulmonary Tuberculosis and in patients with Pulmonary Tuberculosis co-infected with HIV
(David Publishing, 2011)The aim of this study was to compare the pharmacokinetics of antituberculosis drugs in patients with pulmonary tuberculosis (PTB) and in patients with PTB and HIV during the first 24 h of treatment. Designed as a ... -
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 ... -
Affective gesture feedback Instant Messaging on handhelds
(Institute of Electrical and Electronics Engineers, Inc., 2004)Mobile devices and mobile networks are becoming more data-centric (evident in Japanese I-mode) even as mobile network voice Average Revenue Per User are declining, new stream of data services are required which must take ... -
The African Coelecanth genome provides insights into tetrapod evolution
(Macmillan Publishers, 2013)The discovery of a living coelacanth specimen in 1938 was remarkable, as this lineage of lobe-finned fish was thought to have become extinct 70 million years ago. The modern coelacanth looks remarkably similar to many of ... -
Agent-based context-aware healthcare information retrieval using DROPT approach
(International Science Press, 2012)As the volume of information available on the Web information systems is growing continuously, browsing this content becomes a tedious task given the presentation of data that does meet user's aims and needs. In this paper, ... -
Aligned metal absorbers and the ultraviolet background at the end of reionization
(Oxford University Press, 2018)We use observations of spatially-aligned C ii, C iv, Si ii, Si iv, and O i absorbers to probe the slope and intensity of the ultraviolet background (UVB) at z ∼ 6. We accom- plish this by comparing observations with ... -
Alteration of Bax-to-Bcl-2 ratio modulates the anticancer activity of methanolic extract of Commelina benghalensis (Commelinaceae) in Jurkat T cells
(Academic Journals, 2008)Stem extracts of Commelina benghalensis (Linn.), although not extensively documented, are frequently used in traditional medicine for the treatment of ailments such as skin malformations and outgrowths. Accordingly, the ... -
An ambusher’s arsenal: chemical crypsis in the puff adder (Bitis arietans)
(The Royal Society, 2015)Ambush foragers use a hunting strategy that places them at risk of predation by both visual and olfaction-oriented predators. Resulting selective pressures have driven the evolution of impressive visual crypsis in many ...
