Browsing Faculty of Natural Sciences by Title
Now showing items 2446-2465 of 2571
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A unique, ring-like radio source with quadrilateral structure detected with machine learning
(Oxford University Press, 2023)We report the discovery of a unique object in the MeerKAT Galaxy Cluster Le gacy Survey (MGCLS) using the machine learning anomaly detection framework ASTRONOMALY. This strange, ring-like source is 30 from the MGCLS field ... -
A uniquely African focus: bioinformatics is a field that has grown exponentially in the past few years, and it is becoming increasingly important to collaborate as the field continues to gather momentum
(2015)Bioinformatics is a field that has grown exponentially in the past few years, and it is becoming increasingly important to collaborate as the field continues to gather momentum. -
Unlocking community capabilities across health systems in low- and middle-income countries: lessons learned from research and reflective practice
(BioMed Central, 2016)The right and responsibility of communities to participate in health service delivery was enshrined in the 1978 Alma Ata declaration and continues to feature centrally in health systems debates today. Communities are a ... -
Unmasking community trust issues in rural field work
(ACM, 2013)The principal objective of this paper is to describe the au thor's fieldwork and research in a remote rural area of South Africa, where a Village Telco is deployed to provide Voice over Internet Protocol on a wireless mesh ... -
Unmet need for family planning and barriers to contraceptive use in Kaduna, Nigeria: culture, myths and perceptions
(Taylor & Francis, 2020)In 2017, just one-fifth of all married women of reproductive age reported using contraception in Kaduna state, Nigeria, while many more experienced unmet need for contraception. These realities drive risky fertility ... -
Unpacking physics representations: Towards an appreciation of disciplinary affordance
(American Physical Society, 2014)This theoretical article problematizes the access to disciplinary knowledge that different physics representations have the possibility to provide; that is, their disciplinary affordances. It is argued that historically ... -
Unraveling the diversification and systematic puzzle of the highly polymorphic Psammobates tentorius (Bell, 1828) complex (Reptilia: Testudinidae) through phylogenetic analyses and species delimitation approaches
(Wiley-Blackwell, 2020)The high level of phenotypic diversity in southern African tent tortoises (Psammobates tentorius complex) has for decades prevented systematists from developing a stable taxonomy for the group. Here, we used a comprehensive ... -
Unsupervised machine learning for transient discovery in deeper, wider, faster light curves
(Oxford University Press, 2020)Identification of anomalous light curves within time-domain surveys is often challenging. In addition, with the growing number of wide-field surveys and the volume of data produced exceeding astronomers’ ability for manual ... -
An unusual 2,3-secotaraxerene and other cytotoxic triterpenoids from pleiocarpa pycnantha (apocynaceae) leaves collected from Nigeria
(MDPI, 2014)Three known triterpenoids, namely ursolic acid (1), and the 27-E- and 27-Z-pcoumaric esters of ursolic acid (compounds 2, 3), were isolated together with a new triterpene 2,3-seco-taraxer-14-en-2,3-lactone [pycanocarpine ... -
Unveiling the inhibitory potentials of peptidomimetic azanitriles and pyridyl esters towards sars-cov-2 main protease: a molecular modelling investigation
(MDPI, 2023)The severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) is responsible for COVID-19, which was declared a global pandemic in March 2020 by the World Health Organization (WHO). Since SARS-CoV-2 main protease plays ... -
Unveiling the Inhibitory Potentials of Peptidomimetic Azanitriles and Pyridyl Esters towards SARS-CoV-2Main Protease: A MolecularModelling Investigation
(MDPI, 2023)The severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) is responsible for COVID-19, which was declared a global pandemic in March 2020 by the World Health Organization (WHO). Since SARS-CoV-2 main protease plays ... -
Unveiling the universe with emerging cosmological probes
(Springer, 2022)The detection of the accelerated expansion of the Universe has been one of the major breakthroughs in modern cosmology. Several cosmological probes (Cosmic Microwave Background, Supernovae Type Ia, Baryon Acoustic Oscillations) ... -
An update on the techniques used to measure oxidative stress in seminal plasma
(Blackwell Publishing Ltd, 2021)Reactive oxygen species (ROS) are produced in significant amounts by spermatozoa and leucocytes. They are necessary to carry out various physiological functions such as sperm capacitation, hyperactivation, acrosome reaction, ... -
Updates and advances to the FAO56 crop water requirements method
(Elsevier, 2021)This study reviews the abundant research on FAO56 crop coefficients, published following introduction ofthe FAO56 paper in 1998. The primary goal was to evaluate, update, and consolidate the mid-season andend-season single ... -
Updates and advances to the FAO56 crop water requirements method
(Elsevier, 2021)This study reviews the abundant research on FAO56 crop coefficients, published following introduction of the FAO56 paper in 1998. The primary goal was to evaluate, update, and consolidate the mid-season and end-season ... -
The upper temperature for life – where do we draw the line?
(Elsevier, 2004)The newly isolated hyperthermophilic archaeal strain 121 grows slowly at 121 8C and even survives short periods at 130 8C. This is another organism that grows best at temperatures well in excess of 100 8C! We should not ... -
Urban tracer dispersion and infiltration into buildings over a 2-km scale
(Springer Nature, 2020)Field experiments were undertaken in the summer of 2015 in Manchester, UK, to investigate the dispersion behaviour and infiltration into buildings of gas-phase pollutants over horizontal distances of 1–5 km. Inert cyclic ... -
Usability of an authoring tool for generalised scenario creation for signsupport
(Telkom, 2015)This paper presents the usability testing results for an authoring tool that generalises scenario creation for a tool called SignSupport. SignSupport is a mobile communication tool for Deaf people that currently runs ... -
Use of a rat ex-vivo testis culture method to assess toxicity of select known male reproductive toxicants
(Elsevier, 2016)Due to the complex physiology of the testes, in vitro models have been largely unsuccessful at modeling testicular toxicity in vivo. We conducted a pilot study to evaluate the utility of the Durand ex vivo rat seminiferous ... -
Use of coal fly ash as a catalyst in the production of biodiesel
(Slovnaft VÚRUP, 2010)South Africa is largely dependent on the combustion of coal for electricity production; Eskom’s coalfired power stations consume approximately 109 million tons of coal per annum, producing around 25 million tons of ash, ...