Faculty of Natural Sciences: Recent submissions
Now showing items 1781-1800 of 2650
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Comparative phylogeography of parasitic Laelaps mites contribute new insights into the specialist-generalist variation hypothesis (SGVH)
(BMC, 2018)BACKGROUND: The specialist-generalist variation hypothesis (SGVH) in parasites suggests that, due to patchiness in habitat (host availability), specialist species will show more subdivided population structure when compared ... -
Chlorine oxidation of VOCs at a semi-rural site in Beijing: significant chlorine liberation from ClNO2 and subsequent gas- and particle-phase Cl–VOC production
(European Geosciences Union (EGU), 2018)Nitryl chloride (ClNO2) accumulation at night acts as a significant reservoir for active chlorine and impacts the following day’s photochemistry when the chlorine atom is liberated at sunrise. Here, we report simultaneous ... -
Reactive oxygen species and male reproductive hormones
(BMC, 2018)Reports of the increasing incidence of male infertility paired with decreasing semen quality have triggered studies on the effects of lifestyle and environmental factors on the male reproductive potential. There are ... -
The observed galaxy bispectrum from single-field inflation in the squeezed limit
(IOP Publishing, 2018)Using the consistency relation in Fourier space, we derive the observed galaxy bispectrum from single- eld in ation in the squeezed limit, in which one of the three modes has a wavelength much longer than the other two. ... -
The Galactic halo pulsar population
(Oxford University Press, 2018)Most population studies of pulsars have hitherto focused on the disc of the Galaxy, the Galactic centre, globular clusters, and nearby galaxies. It is expected that pulsars, by virtue of their natal kicks, are also to ... -
Predicting the neutral hydrogen content of galaxies from optical data using machine learning
(Oxford University Press, 2018)We develop a machine learning-based framework to predict the Hi content of galaxies using more straightforwardly observable quantities such as optical photometry and environmental parameters. We train the algorithm on z ... -
Synergies between intensity maps of hydrogen lines
(Oxford University Press, 2018)We study synergies between Hi 21cm and Hα intensity map observations, focusing on SKA1- like and SPHEREx-like surveys. We forecast how well such a combination can measure features in the angular power spectrum on the ... -
Surface-modified polyacrylonitrile nanofibers as supports
(Springer Verlag, 2017)Polyacrylonitrile nanofibers (PAN-nfs) are one of the most studied nanofibres because of their excellent characteristics, such as good mechanical strength, chemical resistance, and good thermal stability. Due to the easy ... -
Inhibition of NOS- like activity in maize alters the expression of genes involved in H2O2 scavenging and glycine betaine biosynthesis
(Nature Publishing Group, 2018)Nitric oxide synthase-like activity contributes to the production of nitric oxide in plants, which controls plant responses to stress. This study investigates if changes in ascorbate peroxidase enzymatic activity and ... -
Novel phages of healthy skin metaviromes from South Africa
(Nature Publishing Group, 2018)Recent skin metagenomic studies have investigated the harbored viral diversity and its possible influence on healthy skin microbial populations, and tried to establish global patterns of skin-phage evolution. However, ... -
Geochemistry and weathering history of the Balfour sandstone formation, Karoo basin, South Africa: Insight to provenance and tectonic setting
(Elsevier, 2018)Geochemical analysis on sandstones from clastic sediments was carried out to understand the tectonic setting and subsequent post-depositional change in the Karoo basinal fill of the fluvial deposits of the Balfour Formation ... -
An assessment of social accountability among South African pharmacy schools from public domain information
(AFAHPER-SD, 2017)Global health education reform requires training institutions to align their education, service and research activities with the values of social accountability, which include relevance, equity, quality and effectiveness. ... -
“I just kept quiet”: Exploring equity in a service-learning programme
(International Association for Research on Service-Learning and Community Engagement (IARSLCE), 2016)Social justice underpins the sustainable development goal of health for all. In developing countries, social injustices are particularly severe and widespread, demanding critical and immediate attention. This article describes ... -
Epidemiology and outcomes of Clostridium difficile infection among hospitalised patients: results of a multicentre retrospective study in South Africa
(BMJ Publishing Group, 2018)INTRODUCTION Limited data exist on Clostridium difficile infection (CDI) in low-resource settings and settings with high prevalence of HIV. We aimed to determine baseline CDI patient characteristics and management and ... -
Match injury incidence during the Super Rugby tournament is high: a prospective cohort study over five seasons involving 93 641 player-hours
(BMJ Publishing Group, 2018)OBJECTIVES: To determine the incidence and nature of injuries in the Super Rugby tournament over a 5-year period. METHODS: 482 male professional rugby union players from six South African teams participating in the ... -
Rutin as a potent antioxidant: implications for neurodegenerative disorders
(Hindawi Publishing Corporation, 2018)A wide range of neurodegenerative diseases (NDs), including Alzheimer’s disease, Parkinson’s disease, Huntington’s disease, and prion diseases, share common mechanisms such as neuronal loss, apoptosis, mitochondrial ... -
Pinpointing areas of increased soil erosion risk following land cover change in the Lake Manyara catchment, Tanzania
(Elsevier, 2018)Lack of long-term scientific land cover and erosional data impedes the development of sustainable land management plans to tackle land degradation and soil erosion problems in Tanzania. Using Landsat imagery, almost three ... -
A stochastic TB model for a crowded environment
(Hindawi, 2018)We propose a stochastic compartmental model for the population dynamics of tuberculosis. The model is applicable to crowded environments such as for people in high density camps or in prisons. We start off with a known ... -
CASA in invertebrates
(CSIRO Publishing, 2018)Sperm movement has been described in several phyla of invertebrates. Yet, sperm motility has only been quantified using computer-aided sperm analysis (CASA-Mot) in externally fertilising species (broadcast spawners) of ... -
Peptide-functionalized quantum dots for potential applications in the imaging and treatment of obesity
(DovePress, 2018)BACKGROUND: Obesity is a worldwide epidemic affecting millions of people. The current pharmacological treatment of obesity remains limited and ineffective due to drugs’ undesirable side effects. Hence, there is a need for ...