Browsing Faculty of Natural Sciences by Title
Now showing items 793-812 of 2567
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The EXOTIME project: Signals in the O-C diagrams of the rapidly pulsating subdwarfs DW Lyn, V1636 Ori, QQ Vir, and V541 Hya.
(EDP Sciences, 2020)We aim to investigate variations in the arrival time of coherent stellar pulsations due to the light-travel time effect to test for the presence of sub-stellar companions. Those companions are the key to one possible ... -
Experiences, challenges and lessons from rolling out a rural WiFi mesh network
(ACM, 2013)The DEV community knows that technology interventions involve consideration of social and environmental factors as much as technical ones. This is particularly true for the introduction of communications infrastructure in ... -
An exploration of AGN and Stellar feedback effects in the intergalactic medium via the low-redshift Lyα Forest
(American Astronomical Society, 2023)We explore the role of galactic feedback on the low-redshift Lyα (Lyα) forest (z ≲ 2) statistics and its potential to alter the thermal state of the intergalactic medium. Using the Cosmology and Astrophysics with Machine ... -
Exploration of Deaf people’s health information sources and techniques for information delivery in Cape Town: A qualitative study for the design and development of a mobile health application
(JMIR Publications, 2016)BACKGROUND: Many cultural and linguistic Deaf people in South Africa face disparity when accessing health information because of social and language barriers. The number of certified South African Sign Language interpreters ... -
Exploration of scaffolds from natural products with antiplasmodial activities, currently registered antimalarial drugs and public malarial screen data
(MDPI, 2016)In light of current resistance to antimalarial drugs, there is a need to discover new classes of antimalarial agents with unique mechanisms of action. Identification of unique scaffolds from natural products with in vitro ... -
An exploratory look at associated factors of poverty on educational attainment in Africa and in-depth multilevel modelling for Namibia.
(BER, 2013)This study examines several indicator variables related to education and poverty in Africa from the Demographic and Health Surveys (DHS). Many have described income and education as one of the fundamental determinants ... -
An exploratory study of contractile force production in muscle fibers from patients with inflammatory myopathies
(Wiley-Blackwell, 2020)Introduction: The mechanism by which weakness develops in idiopathic inflammatory myopathies (IIMs) is still unclear. In this study we investigated the maximum force of single muscle fibers from patients with IIMs. Methods: ... -
Exploring and interrogating astrophysical data in virtual reality
(Elsevier, 2021)Scientists across all disciplines increasingly rely on machine learning algorithms to analyse and sort datasets of ever increasing volume and complexity. Although trends and outliers are easily extracted, careful and close ... -
Exploring new genetic variants within col5a1 intron 4‐exon 5 region and tgf‐β family with risk of anterior cruciate ligament ruptures
(Wiley, 2020)Variants within genes encoding structural and regulatory elements of ligaments have been associated with musculoskeletal soft tissue injury risk. The role of intron 4‐exon 5 variants within the α1 chain of type V collagen ... -
Expression of cyclin-dependent kinases and their clinical significance with immune infiltrates could predict prognosis in colorectal cancer
(Elsevier, 2021)Introduction: Colorectal cancer (CRC) is one of the most cancer-related mortalities worldwide and remains a major public health issue. Despite several attempts to develop promising therapies for CRC, its survival rate ... -
Expression, purification and preliminary crystallographic analysis of recombinant human DEAD-box polypeptide 5
(International Union of Crystallography, 2010)The DEAD-box RNA helicase DDX5 is involved in many aspects of RNA processing and has been implicated in a number of cellular processes involving alteration of RNA secondary structure. The N-terminal region of DDX5, ... -
Extending BEAMS to incorporate correlated systematic uncertainties
(IOP Science, 2013)New supernova surveys such as the Dark Energy Survey, Pan-STARRS and the LSST will produce an unprecedented number of photometric supernova candidates, most with no spectroscopic data. Avoiding biases in cosmological ... -
Extending the Hoyle-State Paradigm to 12 C + 12 C Fusion
(American Physical Society, 2022)Carbon burning is a key step in the evolution of massive stars, Type 1a supernovae and superbursts in x-ray binary systems. Determining the 12C þ 12C fusion cross section at relevant energies by extrapolation of direct ... -
Extending the variability selection of active galactic nuclei in the W-CDF-S and SERVS/SWIRE region
(EDP Sciences, 2020)Variability has proven to be a powerful tool to detect active galactic nuclei (AGN) in multi-epoch surveys. The new-generation facilities expected to become operational in the next few years will mark a new era in time-domain ... -
Extensive recombination detected among beak and feather disease virus isolates from breeding facilities in Poland
(Microbiology Society, 2013)Beak and feather disease virus (BFDV) causes the highly contagious, in some cases fatal, psittacine beak and feather disease in parrots. The European continent has no native parrots, yet in the past has been one of the ... -
An extensive search for rapid optical variability in ultracool dwarfs
(Oxford University Press, 2013)In this paper, a summary of optical time-series photometry of 125 ultracool dwarfs is given. The observing strategy was to monitor each object continuously for 2–3 h in order to ascertain whether itwas rapidly variable. ... -
Extracting the global signal from 21-cm fluctuations: the multitracer approach
(Oxford University Press, 2019)The multitracer technique employs a ratio of densities of two differently biased galaxy samples that trace the same underlying matter density field, and was proposed to alleviate the cosmic variance problem. Here, we propose ... -
Extraction and synthesis of silicon nanoparticles (sinps) from sugarcane bagasse ash: A mini-review
(MDPI, 2022)This current study reviews the utilization of the traditional extraction methods and latest findings in extraction of silica from agricultural wastes, in particular, sugarcane bagasse, using inorganic acids to produce ... -
Extragalactic magnetism with sofia (salsa legacy program). vii. a tomographic view of far-infrared and radio polarimetric observations through mhd simulations of galaxies
(IOP Publishing, 2024)The structure of magnetic fields in galaxies remains poorly constrained, despite the importance of magnetism in the evolution of galaxies. Radio synchrotron and far-infrared (FIR) polarization and polarimetric observations ... -
Extreme temperatures compromise male and female fertility in a large desert bird
(Nature Research, 2021)Temperature has a crucial influence on the places where species can survive and reproduce. Past research has primarily focused on survival, making it unclear if temperature fluctuations constrain reproductive success, and ...