Browsing Faculty of Natural Sciences by Title

Now showing items 2513-2532 of 2571

    • Video observations on the habitat association of demersal nekton in the mid-shelf benthic environment off the Orange River mouth 

      Sulaiman, A.; Hissman, K.; Schauer, J.; Wickens, P.A.; McMillan, I.; Gibbons, Mark J. (NISC and Taylor & Francis, 2000)
      A semi-quantitative assessment is made of the animals observed in archived videotapes taken from the research submersible Jago, during diamond mining and exploratory surveys off the mouth of the Orange River on the west ...

    • Video Relay Service for Deaf people using WebRTC 

      Henney, Andre J; Tucker, William D (University of the Western Cape, 2019-03)
      This paper reports on an experimental open source video relay service prototype that helps Deaf people communicate with hearing people by accessing a third party sign language interpreter on a mobile device. Deaf people ...

    • A view on genomic medicine activities in Africa: Implications for policy 

      Jongeneel, C. Victor; Kotze, Maritha J.; Kumuthini, Judit (Frontiers Media, 2022)
      Genomics policy development involves assessing a wide range of issues extending from specimen collection and data sharing to whether and howto utilize advanced technologies in clinical practice and public health initiatives. ...

    • Virome assembly and annotation: A surprise in the Namib Desert 

      Hesse, Uljana; Van Heusden, Peter; Kirby, Bronwyn; Olonade, Israel; van Zyl, Leonardo Joaquim; Trindade, Marla (Frontiers Research Foundation, 2017)
      Sequencing, assembly, and annotation of environmental virome samples is challenging. Methodological biases and differences in species abundance result in fragmentary read coverage; sequence reconstruction is further ...

    • Visible and IR photoluminescence of c-FeSi@a–Si core–shell nano-fibres produced by vapour transport 

      Thabethe, Sibongiseni; Linganiso, Ella; Motaung, David; Mashapa, Matete G.; Nkosi, Steven; Arendse, Christopher; Mwakikung, Bonex W. (Elsevier, 2013)
      The procedures for the synthesis of amorphous ε-FeSi/Sicore–shell nanofibres by vapour transport in a CVD configuration are reported. Crystallite studies by the Williamson-Hall method show the sizes to be typically about ...

    • The VISTA Deep Extragalactic Observations (VIDEO) survey 

      Jarvis, Matt; Bonfield, David G.; Bruce, V.A.; Zwart, J.; Geach, J.E.; McAlpine, K.; McLure, R.J.; Gonzalez-Solares, Eduardo A.; Irwin, M.; Lewis, J.; Kupcu Yoldas, A.; Andreon, S.; Cross, N.J.G.; Emerson, J.P.; Dalton, G.; Dunlop, J.S.; Hodgkin, S. T.; Le Fevre, O.; Karouzos, M.; Meisenheimer, K.; Oliver, S.; Rawlings, S.; Simpson, Chris; Smail, I.; Smith, Daniel J.B.; Sullivan, M.; Sutherland, W.; White, S.V. (Oxford University Press, 2013)
      In this paper we describe the first data release of the the Visible and Infrared Survey Telescope for Astronomy (VISTA) Deep Extragalactic Observations (VIDEO) survey. VIDEO is a 12 degree2 survey in the near-infrared ...

    • Vitek characterisation of type 2 diabetes-associated Candida species 

      Esmaio, Mustafa Hassan Mustafa; Abrantes, Pedro Miguel dos Santos; Africa, Charlene Wilma Joyce (Elsevier, 2017)
      Background: Type 2 diabetes mellitus (T2DM) predisposes patients to opportunistic infections, such as invasive candidiasis. Treatment of candidiasis is challenged by the emerging resistance of Candida species. In this ...

    • VLA imaging of the XMM-LSS/VIDEO deep field at 1–2 GHz 

      Jarvis, M; Heywood, I; Hale, C (Oxford University Press, 2020-06-20)
      Modern radio telescopes are routinely reaching depths where normal star-forming galaxies are the dominant observed population. Realizing the potential of radio as a tracer of star formation and black hole activity over ...

    • The VLA-COSMOS 3 GHz Large Project: Evolution of specific star formation rates out to z∼5 

      Vaccari, Mattia; Leslie, Sarah K.; Schinnerer, Eva (IOP Publishing, 2020)
      We provide a coherent, uniform measurement of the evolution of the logarithmic star formation rate (SFR) – stellar mass (M∗) relation, called the main sequence of star-forming galaxies (MS), for starforming and all galaxies ...

    • VLT/XSHOOTER & Subaru/MOIRCS spectroscopy of HUDF-YD3: No evidence for Lyman-alpha emission at z=8.55 

      Bunker, Andrew J.; Caruana, Joseph; Wilkins, Stephen M.; Jarvis, Matt (Oxford University Press, 2013)
      We present spectroscopic observations with VLT/XSHOOTER and Subaru/MOIRCS of a relatively bright Y -band drop-out galaxy in the Hubble Ultra Deep Field, first selected by Bunker et al. (2010), McLure et al. (2010) and ...

    • Voltammetric and spectroscopic determination of rare earth elements in fresh and surface water samples 

      Makombe, Martin; van der Horst, Charlton; Silwana, Bongiwe; Iwuoha, Emmanuel; Somerset, Vernon (MDPI, 2018)
      The increasing demand for rare earth elements in green technology, electronic components, petroleum refining, and agricultural activities has resulted in their scattering and accumulation in the environment. This study ...

    • Vulnerable diseases affecting child mortality in Sierra Leone: emerging health issue 

      Davids, Saarah F.; Appunni, Sathiya Susuman; Abduraghiem, Latief (SAGE Publications, 2012)
      Child mortality in Sierra Leone is the highest ranked in the world. The main causes for child mortality are maternal factors, environmental factors and health factors. Minimal research has been carried out on health factors ...

    • Walking and the social life of solar charging in rural Africa 

      Bidwell, Nicola J.; Siya, Masbulele Jay; Marsden, Gary; Tucker, William David; Tshemese, M.; Gaven, N.; Ntlangano, Senzo; Robinson, Simon; Eglinton, Kristen Ali (Association for Computing Machinery, 2013)
      We consider practices that sustain social and physical environments beyond those dominating sustainable HCI discourse. We describe links between walking, sociality, and using resources in a case study of community-based, ...

    • WALLABY – an SKA Pathfinder H I survey 

      Cluver, M.E.; Koribalski, Bärbel S.; Staveley-Smith, L. (Springer Nature, 2020)
      The Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) is a next-generation survey of neutral hydrogen (H I) in the Local Universe. It uses the widefield, high-resolution capability of the Australian Square ...

    • Waste minimization protocols for the process of synthesizing zeolites from South African coal fly ash 

      Du Plessis, Pieter W.; Ojumu, Tunde V.; Petrik, Leslie (MDPI, 2013)
      Production of a high value zeolite from fly ash has been shown to be an avenue for the utilization of South African fly ash which presently constitutes a huge disposal problem. The synthesis of zeolites Na-P1 and analcime ...

    • A water balance approach to the sustainable management of groundwater in South Africa 

      Wright, K.A.; Xu, Yongxin (Water Research Commission, 2000)
      The water balance approach, based on the principles of conservation of mass, is applied to the issue of sustainable groundwater management in South Africa, incorporating the ethos of the National Water Act of 1998, ...

    • Water deficit-induced changes in phenolic acid content in maize leaves is associated with altered expression of cinnamate 4-hydroxylase and p-coumaric acid 3-hydroxylase 

      Kolo, Zintle; Majola, Anelisa; Phillips, Kyle (MDPI, 2023)
      The amino acid phenylalanine is a precursor to phenolic acids that constitute the lignin biosynthetic pathway. Although there is evidence of a role of some phenolic acids in plant responses to pathogens and salinity, ...

    • Water distribution network leak detection management 

      Mouton, Francois; de Coning, Arno (Curran Associates Inc., 2020)
      Water is becoming an increasingly scarce commodity and must be effectively managed to ensure minimal losses. Water is a basic human resource and during both a physical and a cyber war, limiting, or interrupting the supply ...

    • Water futures and solutions: Options to enhance water security in sub-Saharan Africa 

      Kanyerere, Thokozani; Tramberend, Sylvia; Levine, Audrey D. (Springer, Cham, 2018)
      Water security is one of the greatest health, ecological, environmental, and human rights challenges of our time. Africa sits at the epicenter of this quandary, with the need to build resilience into already over allocated ...

    • Water materialities and citizen engagement: Testing the implications of water access and quality for community engagement in Ghana and South Africa 

      Harris, Leila M.; Kleiber, Danika; Rodina, Lucy; Yaylaci, Sule; Goldin, Jacqueline; Owen, Germaine (Taylor & Francis, 2017)
      We analyze the relationship between perceptions of domestic water access, and quality, in relation community engagement. While others have suggested linkages between material conditions of water access and engagement ...