Browsing Research Articles (University of Pretoria) by Title

Browsing Research Articles (University of Pretoria) by Title

Sort by: Order: Results:

  • Variability of rainfall over Lake Kariba catchment area in the Zambezi river basin, Zimbabwe 
    Muchuru, Shepherd; Botai, Joel Ongego; Botai, Mihloti Christina; Landman, Willem Adolf; Adeola, Abiodun Morakinyo (Springer, 2016-04)
    In this study, average monthly and annual rainfall totals recorded for the period 1970 to 2010 from a network of 13 stations across the Lake Kariba catchment area of the Zambezi river basin were analyzed in order to ...
  • Variability of satellite derived phenological parameters across maize producing areas of South Africa 
    Adisa, O.M. (Omolola); Botai, Joel Ongego; Hassen, Abubeker; Darkey, Daniel; Adeola, Abiodun Morakinyo; Tesfamariam, Eyob Habte; Botai, Christina M.; Adisa, Abidemi T. (MDPI Publishing, 2018-08-27)
    Changes in phenology can be used as a proxy to elucidate the short and long term trends in climate change and variability. Such phenological changes are driven by weather and climate as well as environmental and ecological ...
  • The variability of the black hole image in M87 at the dynamical timescale 
    Satapathy, Kaushik; Psaltis, Dimitrios; Ozel, Feryal; Medeiros, Lia; Dougall, Sean T.; Chan, Chi-Kwan; Wielgus, Maciek; Prather, Ben S.; Wong, George N.; Gammie, Charles F.; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwae, Thomas; Bustament, Sandra; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chatterjee, Koushik; Chatterjee, Shami; Chen, Ming-Tang; Chen, Yongjun; Cho, Ilje; Christian, Pierre; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Dexter, Jason; Doeleman, Sheperd S.; Eatough, Ralph P.; Falcke, Heino; Farah, Joseph R.; Fish, Vincent L.; Fomalont, Ed; Ford, H. Alyson; Fraga-Encinas, Raquel; Friberg, Per; Fromm, Christian M.; Fuentes, Antonio; Galison, Peter; García, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gold, Roman; Gomez-Ruiz, Arturo I.; Gomez, Jose L.; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; Haggard, Daryl; Hecht, Michael H.; Hesper, Ronald; Ho, Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang, Lei; Hughes, David H.; Ikeda, Shiro; Inoue, Makoto; Issaoun, Sara; James, David J.; Jannuzi, Buell T.; Janssen, Michael; Jeter, Britton; Jiang, Wu; Jimenez-Rosales, Alejandra; Johnson, Michael D.; Jorstad, Svetlana; Jung, Taehyun; Karami, Mansour; Karuppusamy, Ramesh; Kawashima, Tomohisa; Keating, Garrett K.; Kettenis, Mark; Kim, Dong-Jin; Kim, Jae-Young; Kim, Jongsoo; Kim, Junhan; Kino, Motoki; Koay, Jun Yi; Kofuji, Yutaro; Koch, Patrick M.; Koyama, Shoko; Kramer, Carsten; Kramer, Michael; Krichbaum, Thomas P.; Kuo, Cheng-Yu; Lauer, Tod R.; Lee, Sang-Sung; Levis, Aviad; Li, Yan-Rong; Li, Zhiyuan; Lindqvist, Michael; Lico, Rocco; Lindahl, Greg; Liu, Jun; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent; Lonsdale, Colin; Lu, Ru-Sen; MacDonald, Nicholas R.; Mao, Jirong; Marchili, Nicola; Markoff, Sera; Marrone, Daniel P.; Marscher, Alan P.; Martí-Vidal, Iván; Matsushita, Satoki; Matthews, Lynn D.; Menten, Karl M.; Mizuno, Izumi; Mizuno, Yosuke; Moran, James M.; Moriyama, Kotaro; Moscibrodzka, Monika; Muller, Cornelia; Mejías, Alejandro Mus; Musoke, Gibwa; Nagai, Hiroshi; Nagar, Neil M.; Nakamura, Masanori; Narayan, Ramesh; Narayanan, Gopal; Natarajan, Iniyan; Nathanail, Antonios; Neilsen, Joey; Neri, Roberto; Ni, Chunchong; Noutsos, Aristeidis; Nowak, Michael A.; Okino, Hiroki; Olivares, Hector; Ortiz-Leon, Gisela N.; Oyama, Tomoaki; Palumbo, Daniel C. M.; Park, Jongho; Pate, Nimesh; Pen, Ue-Li; Pesce, Dominic W.; Pietu, Vincent; Plambeck, Richard; PopStefanija, Aleksandar; Porth, Oliver; Pötzl, Felix M.; Preciado-Lopez, Jorge A.; Pu, Hung-Yi; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Rezzolla, Luciano; Ripperda, Bart; Roelofs, Freek; Rogers, Alan; Ros, Eduardo; Rose, Mel; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruszczyk, Chet; Rygl, Kazi L. J.; Sanchez, Salvador; Sanchez-Arguelles, David; Sasada, Mahito; Savolainen, Tuomas; Schloerb, F. Peter; Schuste, Karl-Friedrich; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Sun, He; Tazaki, Fumie; Tetarenko, Alexandra J.; Tiede, Paul; Tilanus, Remo P. J.; Titus, Michael; Toma, Kenji; Torne, Pablo; Traianou, Efthalia; Trent, Tyler; Trippe, Sascha; Bemmel, Ilse van; Van Langevelde, Huib Jan; Van Rossum, Daniel R.; Wagner, Jan; Ward-Thompson, Derek; Wardle, John; Weintroub, Jonathan; Wex, Norbert; Wharton, Robert; Wiik, Kaj; Wu, Qingwen; Yoon, Doosoo; Young, André; Young, Ken; Younsi, Ziri; Yuan, Feng; Yuan, Ye-Fei; Zensus, J. Anton; Zhao, Guang-Yao; Zhao, Shan-Shan (American Astronomical Society, 2022-01)
    The black hole images obtained with the Event Horizon Telescope (EHT) are expected to be variable at the dynamical timescale near their horizons. For the black hole at the center of the M87 galaxy, this timescale (5–61 ...
  • Variability of the preC/C region of hepatitis B virus genotype A from a South African cohort predominantly infected with HIV 
    Mayaphi, Simnikiwe Horatious; Martin, Desmond J.; Mphahlele, M. Jeffrey; Blackard, Jason T.; Bowyer, Sheila Mary (Wiley, 2013-11)
    Hepatitis B virus (HBV) is a serious global health problem, and HBV genotype is an important determinant of disease progression and treatment outcome. The aim of this study was to assess variations of the precore/core ...
  • Variability properties of daily and monthly observed near-surface temperatures in Uganda : 1960-2008 
    Nsubuga, Francis Wasswa Nkugwa; Olwoch, Jane Mukarugwiza; Rautenbach, Cornelis Johannes de Wet (Wiley-Blackwell, 2014-02)
    Variability and trends in daily and monthly near-surface temperatures in Uganda, collected over the period 1960–2008 (49 years), are analysed. For this purpose, daily observational maximum and minimum temperature records from ...
  • Variable effects of termite mounds on African savanna grass communities across a rainfall gradient 
    Davies, Andrew Byron; Robertson, Mark P.; Levick, Shaun R.; Asner, Gregory P.; Jansen van Rensburg, Berndt; Parr, Catherine Lucy (Wiley, 2014-11)
    QUESTIONS : Termite mounds of the genus Macrotermes are prominent features in African savannas, forming nutrient hotspots that support greater plant diversity, which is of higher nutritional value than the surrounding ...
  • Variable P supply affects N metabolism in a legume tree, Virgilia divaricata, from nutrient-poor Mediterranean-type ecosystems 
    Magadlela, Anathi; Kleinert, Aleysia; Steenkamp, Emma Theodora; Valentine, Alexander J. (CSIRO Publishing, 2016-02)
    Virgilia divaricata Adamson is a forest margin legume that is known to invade the N- and P-poor soils of the mature fynbos, implying that it tolerates variable soil N and P levels. It is not known how the legume uses ...
  • Variable parameter estimation of consumer price expectations for the South African economy 
    Koekemoer, Reneé (Blackwell, 2001-03)
    Individuals frequently form expectation about the future level of prices e.g. when making consumption expenditure decisions and during wage bargaining. Expectations are formed conditional on economic agents' perceptions ...
  • Variable resistance to Quambalaria pitereka in spotted gum reveal opportunities for disease screening 
    Pegg, Geoffrey S.; Carnegie, Angus J.; Wingfield, Michael J.; Drenth, Andre (Springer, 2011-01)
    Quambalaria shoot blight, caused by the fungus Quambalaria pitereka, is a serious disease affecting the development of spotted gum (Corymbia citriodora subsp. citriodora, C. citriodora subsp. variegata, C. henryi and C. ...
  • Variable water quality of domestic wells emphasizes the need for groundwater quality monitoring and protection : Stinkwater, Hammanskraal, Gauteng 
    Baloyi, Rhulane S.; Diamond, Roger E. (Water Research Commission, 2019)
    Groundwater is a critical water resource in many peri-urban areas without municipal water supply, a common situation globally, but especially in Africa. These areas contain multiple water pollution risks from various human ...
  • Variable- and fixed-length balanced runlength-limited codes based on a Knuth-like balancing method 
    Paluncic, Filip; Maharaj, Bodhaswar Tikanath Jugpershad; Ferreira, Hendrik C. (Institute of Electrical and Electronics Engineers, 2019-11)
    A novel Knuth-like balancing method for runlength-limited words is presented, which forms the basis of new variable- and fixed-length balanced runlength-limited codes that improve on the code rate as compared to balanced ...
  • Variables influencing the outcomes of the whistle blowing process in South Africa 
    Holtzhausen, Natasja (Association of Teachers in Public Administration, 2012-12)
    Whistle blower protection in South Africa becomes a point of contention every time a disclosure is made and the whistle blower is murdered or victimised. The purpose of this article is to describe the variables that will ...
  • Variants of consumption-wealth ratios and predictability of U.S. government bond risk premia 
    Cepni, Oguzhan; Gupta, Rangan; Wohar, Mark E. (Wiley, 2021-06)
    Please read abstract in the article.
  • Variation and covariation in strongyle infection in East African shorthorn zebu calves 
    Callaby, R.; Hanotte, Olivier; Conradie van Wyk, Ilana; Kiara, Henry; Toye, Philip G.; Mbole-Kariuki, Mary Ndila; Jennings, Amy; Thumbi, Samuel Mwangi; Coetzer, Jacobus A.W.; Bronsvoort, Barend Mark de Clare; Knott, S.A.; Woolhouse, Mark E.J.; Kruuk, Loeske E.B. (Cambridge University Press, 2015-03)
    Parasite burden varies widely between individuals within a population, and can covary with multiple aspects of individual phenotype. Here we investigate the sources of variation in faecal strongyle eggs counts, and its ...
  • Variation in amylose concentration to enhance wheat flour extrudability 
    Hellemans, T.; Nekhudzhiga, H.; Van Bockstaele, F.; Wang, Y.J.; Emmambux, Mohammad Naushad; Eeckhout, M. (Elsevier, 2020-09)
    Composition and functionality of five waxy wheat (Triticum aestivum L.) genotypes were elaborately investigated and related to end-product attributes of extrudates. As such, the interaction between starch biopolymers and ...
  • Variation in assemblages of feather bacteria in relation to plumage color in female great tits 
    Kilgas, Priit; Saag, Pauli; Magi, Marko; Edenberg, Meeli; Tilgar, Vallo; Mand, Raivo (University of California Press, 2012)
    Microorganisms are known to play an important role in shaping the life histories of animals. Recent studies have proposed that the coloration of birds’ plumage could reflect individual quality through associations with ...
  • Variation in Botryosphaeriaceae from Eucalyptus plantations in YunNan Province in southwestern China across a climatic gradient 
    Li, Guoqing; Slippers, Bernard; Wingfield, Michael J.; Chen, ShuaiFei (BioMed Central, 2020-12)
    The Botryosphaeriaceae accommodates many important pathogens of woody plants, including Eucalyptus. Recently, Botryosphaeriaceae were isolated from diseased plant parts from surveys of Eucalyptus plantations in the ...
  • Variation in faecal water content may confound estimates of gastro-intestinal parasite intensity in wild African herbivores 
    Turner, Wendy C.; Cizauskas, C.A.; Getz, Wayne Marcus (Cambridge University Press, 2010)
    Estimates of parasite intensity within host populations are essential for many studies of host–parasite relationships. Here we evaluated the seasonal, age- and sex-related variability in faecal water content for two wild ...
  • Variation in fungicide sensitivity among Rhizoctonia isolates recovered from potatoes in South Africa 
    Muzhinji, Norman; Woodhall, J.W.; Truter, Mariëtte; Van der Waals, Jacqueline Elise (American Phytopathological Society, 2018-08)
    Please read abstract in the article.
  • Variation in growth of Damaraland mole-rats is explained by competition rather than by functional specialization for different tasks 
    Zottl, Markus; Thorley, Jack; Gaynor, David; Bennett, Nigel Charles; Clutton-Brock, Tim H. (The Royal Society, 2016-12)
    In some eusocial insect societies, adaptation to the division of labour results in multimodal size variation among workers. It has been suggested that variation in size and growth among nonbreeders in naked and Damaraland ...