Faculty of Natural Sciences: Recent submissions

Now showing items 2101-2120 of 2662

    • The neutral hydrogen content of galaxies in cosmological hydrodynamic simulations 

      Dave, Romeel; Katz, Neal; Oppenheimer, Benjamin D.; Kollmeier, Juna A.; Weinberg, David H. (Oxford University Press, 2013)
      We examine the global HI properties of galaxies in quarter billion particle cosmological simulations using GADGET-2, focusing on howgalactic outflows impactHI content.We consider four outflow models, including a new one ...

    • From vagueness to precision: raising the volume on social issues for the water sector 

      Goldin, Jacqueline (IWA Publishing, 2013)
      The paper raises the volume on complex social issues that affect water management. The paper proposes Amartya Sen's capability approach (CA) as a suitable framework against which to consider these complex ideals. This ...

    • The ongoing pursuit of R Coronae Borealis stars: the ASAS-3 survey strikes again 

      Tisserand, P.; Clayton, G.; Kilkenny, David; Welch, D. L.; Wyrzykowsk, L.; Pilecki, B. (EDP Sciences, 2013)
      CONTEXT: R Coronae Borealis stars( RCBs) are rare, hydrogen-deficient, carbon rich super giant variable stars that are likely the evolved merger products of pairs of CO and He white dwarfs. Only 55 RCB stars have been found ...

    • Using a disciplinary discourse lens to explore how representations afford meaning making in a typical wave physics course 

      Enghag, Margareta; Forsman, Jonas; Linder, Cedric; MacKinnon, Allan; Moons, Ellen (Springer Verlag, 2013)
      We carried out a case study in a wave physics course at a Swedish university in order to investigate the relations between the representations used in the lessons and the experience of meaning making in interview–discussions. ...

    • The preferentially magnified active nucleus in IRAS F10214+4724 - III. VLBI observations of the radio core 

      Deane, Roger P.; Rawlings, S.; Jarvis, Matt; Garrett, M. A.; Heywood, Ian; Klöckner, H. R.; Marshall, P. J.; McKean, J. P. (Oxford University Press, 2013)
      We report 1.7GHz very long baseline interferometry (VLBI) observations of IRAS F10214+4724, a lensed z = 2.3 obscured quasar with prodigious star formation. We detect what we argue to be the obscured active nucleus with ...

    • The Q/U imaging experiment instrument 

      Biscoff, C.; Brizius, A.; Zwart, J.; Buder, I.; Chinone, Y.; Cleary, K.; Dumoulin, R.N.; Kusaka, A.; Monsalve, R.; Naess, S.K.; Newburgh, L.B.; Nixon, G.; Reeves, R.; Smith, K.M.; Vanderlinde, K.; Wehus, I.K.; Bogdan, M.; Bustos, R.; Church, S.E.; Davis, Robert; Dickenson, C.; Eriksen, H.K.; Gaier, T.; Gundersen, J.O.; Hasegawa, M.; Hazumi, M.; Holler, C.; Huffenberger, K.M.; Imbriale, W.A.; Ishidoshiro, K.; Jones, M.E.; Kangaslahti, P.; Kapner, D.J.; Lawrence, C.R.; Leitch, E.M.; Limon, M.; McMahon, J.J.; Miller, A.D.; Nagai, M.; Nguyen, H.; Pearson, T.J.; Piccirillo, L.; Radford, S.J.E.; Readhead, A.C.S.; Richards, J.L.; Samtleben, D.; Seiffert, M.; Shepherd, M.C.; Staggs, S.T.; Tajima, O.; Thompson, K.L.; Williamson, R.; Winstein, B.; Wollack, E.J. (The American Astronomical Society, 2013)
      The Q/U Imaging ExperimenT (QUIET) is designed to measure polarization in the cosmic microwave background, targeting the imprint of inflationary gravitational waves at large angular scales(∼1◦). Between 2008 October and ...

    • Genome sequences of three vaccine strains and two wild-type canine distemper virus strains from a recent disease outbreak in South Africa 

      Loots, Angelika K.; Du Plessis, Morné; Dalton, Desiré Lee; Mitchell, Emily; Venter, Estelle H. (American Society for Microbiology, 2017)
      Canine distemper virus causes global multihost infectious disease. This report details complete genome sequences of three vaccine and two new wild-type strains. The wild-type strains belong to the South African lineage, ...

    • The roles of star formation and AGN activity of IRS sources in the HerMES fields 

      Feltre, Anna; Hatziminaoglou, Evanthia; Vaccari, Mattia; Hernán-Caballero, Antonio; Fritz, Jacopo; Franceschini, Alberto; Bock, J.; Cooray, Asantha; Farrah, Duncan; Gonzalez-Solares, Eduardo A.; Ibar, Edo; Isaak, Kate G.; Lo Faro, Barbara; Marchetti, L.; Oliver, Seb J.; Page, Matthew J.; Rigopoulou, Dimitra; Roseboom, Isaac G.; Symeonidis, Myrto (Oxford University Press, 2013)
      In this work we explore the impact of the presence of an active galactic nucleus (AGN) on the mid- and far-infrared (IR) properties of galaxies as well as the effects of simultaneous AGN and starburst activity in these ...

    • Will climate warming exceed lethal photosynthetic temperature thresholds of lichens in a southern African arid region? 

      Maphangwa, Khumbudzo Walter; Musil, Charles F.; Raitt, Lincoln; Zedda, Luciana (Wiley, 2013)
      Predicted elevated temperatures and a shift from a winter to summer rainfall pattern associated with global warming could result in the exposure of hydrated lichens during summer to more numerous temperature extremes that ...

    • The slow flow model of dust eflux in local star-forming galaxies 

      Zahid, H.; Torrey, Paul; Dave, Romeel; Geller, Margaret; Kudritzki, Rolf; Kewley, Lisa J. (Oxford University Press, 2013)
      We develop a dust efflux model of radiation pressure acting on dust grains which successfully reproduces the relation between stellar mass, dust opacity and star forma- tion rate observed in local star-forming galaxies. ...

    • Students' ontological security and agency in science education - an example from reasoning about the use of gene technology 

      Lindahl, Mats Gunnar; Linder, Cedric (Taylor & Francis, 2013)
      This paper reports on a study of how students' reasoning about socioscientific issues is framed by three dynamics: societal structures, agency and how trust and security issues are handled. Examples from gene technology ...

    • 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 ...

    • Theoretical evolution of optical strong lines across cosmic time 

      Kewley, Lisa J.; Dopita, Michael A.; Dave, Romeel; Leitherer, Claus; Yuan, Tiantian; Allen, Mark; Groves, Brent; Sutherland, Ralph (The American Astronomical Society, 2013)
      We use the chemical evolution predictions of cosmological hydrodynamic simulations with our latest theoretical stellar population synthesis, photoionization, and shock models to predict the strong line evolution of ...

    • Characterizing the emergence and persistence of drug resistant mutations in HIV-1 subtype C infections using 454 ultra deep pyrosequencing 

      Bansode, Vijay; McCormack, Grace P.; Shrestha, Ram K.; Travers, Simon A.; Crampin, Amelia C.; Ngwira, Bagrey; French, Neil; Glynn, Judith R. (BioMed Central -The Open Access Publisher, 2013)
      BACKGROUND: The role of HIV-1 RNA in the emergence of resistance to antiretroviral therapies (ARTs) is well documented while less is known about the role of historical viruses stored in the proviral DNA. The primary ...

    • Avihepadnavirus diversity in parrots is comparable to that found amongst all other avian species 

      Piasecki, Tomasz; Harkins, Gordon William; Chrzastek, Klaudia; Julian, Laurel; Martin, Darren Patrick; Varsani, Arvind (Elsevier, 2013)
      Avihepadna viruses have previously been isolated from various species of duck ,goose, stork, heron and crane. Recently the first parrot avihepadna virus was isolated from a Ring-necked Parakeet in Poland. In this study, ...

    • Evidence that dicot-infecting mastreviruses are particularly prone to inter-species recombination and have likely been circulating in Australia for longer than in Africa and the Middle East 

      Kraberger, Simona; Harkins, Gordon William; Kumari, Safaa G.; Thomas, John E.; Schwinghamer, Mark W.; Sharman, Murray; Collings, David A.; Briddon, Rob W.; Martin, Darren Patrick; Varsani, Arvind (Elsevier, 2013)
      Viruses of the genus Mastrevirus (family Geminiviridae) are transmitted by leafhoppers and infect either mono- or dicotyledonous plants. Here we have determined the full length sequences of 49 dicot-infecting mastrevirus ...

    • Evidence of pervasive biologically functional secondary structures within the Genomes of Eukaryotic Single-Stranded DNA Viruses 

      Muhire, Brejnev Muhizi; Golden, Michael; Tanov, Emil Pavlov; Harkins, Gordon William; Murrell, Ben; Lefeuvre, Pierre; Lett, Jean-Michel; Gray, Alistair; Poon, Art Y. F.; Ngandu, Nobubelo Kwanele; Semegni, Yves; Monjane, Adérito Luis; Varsani, Arvind; Shepherd, Dionne Natalie; Martin, Darren Patrick (American Society for Microbiology, 2013)
      Single-stranded DNA (ssDNA) viruses have genomes that are potentially capable of forming complex secondary structures through Watson-Crick base pairing between their constituent nucleotides. A few of the structural elements ...

    • Patient-Control Association Study of the Leucine-Rich Repeat Kinase 2 (LRRK2) Gene in South African Parkinson's Disease Patients 

      Bardien, Soraya; Blanckenberg, Janine; van der Merwe, Lize; Farrer, Matthew J.; Ross, Owen A. (National Institute of Health, 2013)
      The leucine-rich repeat kinase 2 (LRRK2) gene is of interest to Parkinson's disease (PD) as it has been implicated in both familial and sporadic forms of the disorder.1 PD-susceptibility alleles in LRRK2 appear to be ...

    • Spectroscopy of the variable K-dwarf UNSW-V-760: is it a pre-main-sequence pulsator? 

      Koen, Chris; Gray, Richard O.; Kawaler, S.; Crawford, S. M. (Oxford University Press, 2013)
      The star UNSW-V-760 is a known variable, showing both flares and two non-sinusoidal periodicities. Availability of high signal-to-noise spectra reported in this paper has enabled a revision of the spectral type of this ...

    • A Panel of Ancestry Informative Markers for the Complex Five-Way Admixed South African Coloured Population 

      Daya, Michelle; van der Merwe, Lize; Galal, Ushma; Möller, Marlo; Salie, Muneeb; Chimusa, Emile R.; Galanter, Joshua M.; van Helden, Paul D.; Henn, Brenna M.; Gignoux, Chris R.; Hoal, Eileen G. (PloS, 2013)
      Admixture is a well known confounder in genetic association studies. If genome-wide data is not available, as would be the case for candidate gene studies, ancestry informative markers (AIMs) are required in order to adjust ...