Browsing Faculty of Natural Sciences by Title
Now showing items 699-718 of 1885
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Gaia Data Release 1. Open cluster astrometry: performance, limitations, and future prospects
(EDP Sciences, 2017)CONTEXT: The first Gaia Data Release contains the Tycho-Gaia Astrometric Solution (TGAS). This is a subset of about 2 million stars for which, besides the position and photometry, the proper motion and parallax are ... -
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 ... -
Galaxy and Mass Assembly (GAMA): A wise study of the activity of emission-line systems in G23
(IOP Publishing, 2020)We present a detailed study of emission-line systems in the GAMA G23 region, making use of WISE photometry that includes carefully measured resolved sources. After applying several cuts to the initial catalogue of ∼41,000 ... -
Galaxy and Mass Assembly (GAMA): A WISE Study of the Activity of Emission-line Systems in G23
(2020)We present a detailed study of emission-line systems in the GAMA G23 region, making use of WISE photometry that includes carefully measured resolved sources. After applying several cuts to the initial catalogue of ∼41,000 ... -
Galaxy And Mass Assembly (GAMA): Defining passive galaxy samples and searching for the UV upturn
(Oxford University Press, 2019)We use data from the GAMA and GALEX surveys to demonstrate that the UV upturn, an unexpected excess of ultraviolet flux from a hot stellar component, seen in the spectra of many early-type galaxies, arises from processes ... -
Galaxy and Mass Assembly (GAMA): Demonstrating the power of WISE in the study of Galaxy Groups to z < 0.1
(IOP Publishing, 2020)Combining high-fidelity group characterisation from the Galaxy and Mass Assembly (GAMA) survey and source-tailored z < 0.1 photometry from the WISE survey, we present a comprehensive study of the properties of ungrouped ... -
Galaxy And Mass Assembly (GAMA): Resolving the role of environment in galaxy evolution
(Oxford University Press, 2013)We present observations of 18 galaxies from the Galaxy And Mass Assembly (GAMA) survey made with the SPIRAL optical integral field unit (IFU) on the Anglo- Australian Telescope. The galaxies are selected to ... -
Galaxy And Mass Assembly (GAMA): spectroscopic analysis
(Oxford University Press, 2013)The Galaxy And Mass Assembly (GAMA) survey is a multiwavelength photometric and spectroscopic survey, using the AAOmega spectrograph on the Anglo-Australian Telescope to obtain spectra for up to _ 300 000 galaxies over ... -
Galaxy and mass assembly: evolution of the Hα luminosity function and star formation rate density up to z < 0.35
(OUP, 2013)Measurements of the low-z Hα luminosity function, Φ, have a large dispersion in the local number density of sources (∼0.5–1 Mpc−3 dex−1), and correspondingly in the star formation rate density (SFRD). The possible causes ... -
Galaxy cold gas contents in modern cosmological hydrodynamic simulations
(Oxford University Press, 2020-07-03)We present a comparison of galaxy atomic and molecular gas properties in three recent cosmological hydrodynamic simulations, namely SIMBA, EAGLE, and IllustrisTNG, versus observations from z ∼ 0 to 2. These simulations ... -
Galaxy correlations and the BAO in a void universe: structure formation as a test of the Copernican Principle
(IOP Science, 2013)A suggested solution to the dark energy problem is the void model, where accelerated expansion is replaced by Hubble-scale inhomogeneity. In these models, density perturbations grow on a radially inhomogeneous background. ... -
Gama/H-Atlas: The dust opacity-stellar mass surface density relation for spiral galaxies
(IOP Science, 2013)We report the discovery of a well-defined correlation between B-band face-on central optical depth due to dust and the stellar mass surface density of nearby spiral galaxies. This relation was derived from a sample of ... -
Gender and participation: critical reflection on Zenzeleni Networks in Mankosi, South Africa
(ACM, 2016-11-25)This paper unveils the complexity of gender dynamics by reflecting on lessons learned in Zenzeleni Networks and provides a different perspective to notions of “participation” by asking “who participates and how?” The paper ... -
Gene expression alterations and molecular analysis of CHEK1 in solid tumors
(MDPI, 2020)Alterations in the Checkpoint kinase (CHEK1) gene, its regulation, and the possible clinical outcomes in human solid tumors have not been previously examined. Therefore, the present study was carried out to evaluate the ... -
Gene expression modulation of apoptotic and oestrogen receptor alpha genes by active fractions of selected Nigerian plants on cervical cancer cell line (hela)
(University of Benin, 2021)The roles of natural product in drug discovery and development cannot be over emphasised. It plays a vital role in human therapy and gives a better understanding on the cellular pathways.This study investigated the ... -
Generalization of tooltips: An assistive technology extension
(Springer, 2017)Software applications use tooltips to assist users to improve their understanding of icons. When hovering over an icon with the cursor, a short text description of the icon appears. Text-based tooltips are helpful for users ... -
Genetic association of solute carrier transporter gene variants with metformin response
(Balkan Journal of Medical Genetics, 2021)Type 2 diabetes mellitus (T2DM) is a metabolic disorder characterized by elevated blood glucose levels and is influenced by both genetic and environmental factors. It is treated with various classes of oral antidiabetic ... -
Genetic characterisation of Campylobacter concisus: Strategies for improved genomospecies discrimination
(Elsevier, 2021)Although at least two genetically distinct groups, or genomospecies, have been well documented for Campylobacter concisus, no phenotype has yet been identified for their differentiation and thus formal description as ... -
Genetic diversity, population structure and marker- trait association for 100-seed weight in international safflower panel using silicodart marker information
(MDPI, 2020)Safflower is an important oilseed crop mainly grown in the arid and semi-arid regions of the world. The aim of this study was to explore phenotypic and genetic diversity, population structure, and marker-trait association ... -
Genetic lesions within the 3a gene of SARS-CoV
(BioMed Central, 2005)A series of frameshift mutations within the 3a gene has been observed in culture-derived severe acute respiratory syndrome coronavirus (SARS-CoV). We report here that viral RNA from clinical samples obtained from SARS-CoV ...
