Browsing Natural and Agricultural Sciences by Title

Browsing Natural and Agricultural Sciences by Title

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  • The vegetation of Omusati and Oshana regions, central-northern Namibia 
    Kangombe, Fransiska Ndiiteela (University of Pretoria, 2012-08-01)
    Central-northern Namibia is home to an approximate 43% of the country’s population, a large proportion of which still depends directly on natural resources for their livelihoods. The main land use in this area is ...
  • Vegetation of Richards Bay municipal area, KwaZulu-Natal, South Africa, with specific reference to wetlands 
    Burger, Jeanine (University of Pretoria, 2009-09-04)
    A vegetation survey was conducted at plant community level within the boundaries of Richards Bay Municipal area during 2001 to 2002. Relevés was randomly selected and floristic information was recorded for 310 sample plots ...
  • Vegetation of the Hantam-Tanqua-Roggeveld subregion, South Africa. Part 1 : Fynbos Biome related vegetation 
    Van der Merwe, Helga; Van Rooyen, Margaretha W.; Van Rooyen, Noel (South African National Parks, 2008)
    The Succulent Karoo Hotspot stretches along the western side of the Republic of South Africa and Namibia. A lack of botanical information on the Hantam-Tanqua-Roggeveld area of the Succulent Karoo Hotspot was identified ...
  • Vegetation on the ultramafic soils of the Sekhukhuneland Centre of Endemism 
    Siebert, Stefan John (University of Pretoria, 2006-11-30)
    Please read the abstract in the section, 00front, of this document
  • Vegetation patch dynamics in rangelands : how feedbacks between large herbivores, vegetation and soil fauna alter patches over space and through time 
    Smit, Christian; Buyens, Isabelle P.R.; Le Roux, Peter Christiaan (Wiley, 2023-10)
    AIM : Large herbivore grazing is a popular conservation management tool to promote vegetation structural diversity of rangelands. However, vegetation patch dynamics, that is, how patches of grazing-defended tall vegetation ...
  • Vegetation response to grazing and drought (13 yr) in a conservation area in the Succulent Karoo, South Africa 
    Geldenhuys, Conrad; Van der Merwe, Helga; Van Rooyen, M.W. (Margaretha W.), 1950- (Elsevier, 2023-12)
    Rangelands of arid ecosystems are driven by internal and external environmental controls. Grazing pressure is an important anthropogenic driver, but stochastic environmental events such as rainfall variability and prolonged ...
  • Vegetation structure shapes small mammal communities in African savannas 
    Loggins, Anne A.; Monadjem, Ara; Kruger, Laurence M.; Reichert, Brian E.; McCleery, Robert A. (Oxford University Press, 2019-07)
    Disturbance by large herbivores, fires, and humans shapes the structure of savannas, altering the amount of woody vegetation and grass. Due to change in the intensity and frequency of these disturbances, savannas are ...
  • Vegetation studies in the management of ungulates on the Bynespoort Game Park, Cullinan 
    Hauptfleisch, Morgan Lindo (University of Pretoria, 2008-06-20)
    Please read the abstract in the section, 00front, of this document
  • Vegetation trends following fire in the Roggeveld, Mountain Renosterveld, South Africa 
    Van der Merwe, Helga; Van Rooyen, Margaretha W. (Elsevier, 2011-01)
    The Mountain Renosterveld vegetation of the Roggeveld is an escarpment type renosterveld showing strong karroid affinities. Fire plays an important role as a landscape scale disturbance that shapes plant communities in ...
  • Vegetative desiccation tolerance in the resurrection plant Xerophyta humilis has not evolved through reactivation of the seed canonical LAFL regulatory network 
    Lyall, Rafe; Schlebusch, Stephen A.; Proctor, Jessica; Prag, Mayur; Hussey, Steven Grant; Ingle, Robert A.; Illing, Nicola (Wiley, 2020-03)
    It has been hypothesised that vegetative desiccation tolerance in resurrection plants evolved via reactivation of the canonical LAFL (i.e. LEC1, ABI3, FUS3 and LEC2) transcription factor (TF) network that activates ...
  • The vegetative propagation and quality specifications of Pinus Patula hybrid cuttings 
    Ford, Craig M. (University of Pretoria, 2014-01)
    Pinus patula has for many years been the most important softwood species along the eastern regions of southern Africa but as a result of the pine pathogen, Fusarium circinatum, there have been serious establishment ...
  • Vegetative propagation of Pappea capensis Eckl.&Zeyh. (Jacket plum) by means of stem cuttings and air layers 
    Rafiri, Matumelo Alice (University of Pretoria, 2010-08-08)
    Jacket plum [ Pappea capensis ( Eckl.&Zeyh)] belongs to the Sapindaceae or Litchi family. It is well adapted to different climatic conditions. It has been used for medicinal purposes for both animals and human beings. Due ...
  • Vegetative propagation, growth and metabolite response of Myrsine africana to photoselective shade netting 
    Coles, Zane Steven (University of Pretoria, 2020)
    Natural products derived from indigenous plant species continue to gain interest in the medicinal and cosmetics industries. This places pressure on plant populations and ecosystems. Therefore, this necessitates domestication ...
  • Veldtipes, verspreiding van die groter soogdiere, en enkele aspekte van die ekologie van Kaokoland 
    Viljoen, Philippus Jacobus (University of Pretoria, 1980)
    Initiated in 1975, the purpose of this study was to obtain basic ecological information needed for the conservation, management and utilization of the fauna and flora of Kaokoland, S.W.A. Accordingly the vegetation of ...
  • Veralgemeende Sylvester-Gallai Stelling 
    Swanepoel, Konrad Johann; Pretorius, Lou M. (Lourens Martin) (Suid Afrikaanse Akademie vir Wetenskap & Kuns, 2007-03)
    Ons gee 'n algoritmiese bewys vir die kontrapositief van die volgende stelling wat onlangs deur die outeurs bewys is: Laat S 'n eindige versameling van punte in die vlak wees, met elke punt rooi, blou of met beide kleure ...
  • Verbrokkeling van grond met behulp van vibrasies 
    Venter, Gerhardus (University of Pretoria, 1968)
    No abstract available
  • Verdelingsvrye toetsingsmetodes vir die probleem van twee of meer steekproewe (Afrikaans) 
    Lemmer, Hermanus Hofmeyr (University of Pretoria, 1964)
    Please read the abstract in the thesis
  • The Verification of different model configurations of the Unified Atmospheric Model over South Africa 
    Mahlobo, Dawn Duduzile (University of Pretoria, 2013)
    In 2006 a Numerical Weather Prediction (NWP) model known as the Unified Model (UM) from the United Kingdom Meteorological Office (UK Met Office) was installed at the South African Weather Service (SAWS). Since then it ...
  • Verification of numerical weather predictions for the western Sahel by the United Kingdom Met Office Limited area model over Africa 
    Idowu, Oluseun Samuel (University of Pretoria, 2009-09-15)
    Numerical Weather Predictions (NWPs) are subject to systematic errors and biases. Hence, the continuous verification of NWP model outputs in order to contribute to model improvement became very important over recent years. ...
  • Verification of radiative transfer schemes for the EHT 
    Gold, Roman; Broderick, Avery E.; Younsi, Ziri; Fromm, Christian M.; Gammi, Charles F.; Mościbrodzka, Monika; Pu, Hung-Yi; Bronzwaer, Thomas; Davelaar, Jordy; Dexter, Jason; Ball, David; Chan, Chi-kwan; Kawashima, Tomohisa; Mizuno, Yosuke; Ripperda, Bart; Ripperda, Bart; Alberdi, Antxon; Alef, Walter; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Balokovic, Mislav; Barrett, John; Bintley, Dan; Blackburn, Lindy; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broguiere, Dominique; 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.; Crew, Geoffrey B.; Cui, Yuzhu; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Doeleman, Sheperd S.; Eatough, Ralph P.; Falcke, Heino; Fish, Vincent L.; Fomalont, Ed; Fraga-Encinas, Raquel; Freeman, Bill; Friberg, Per; Gómez, Jose L.; Galison, Peter; García, Roberto; Gentaz, Olivier; Georgiev, Boris; Goddi, Ciriaco; Gu, Minfeng; Gurwell, Mark; Hada, Kazuhiro; Hecht, Michael H.; Hesper, Ronald; Ho, Luis C.; Ho, Paul; Honma, Mareki; Huang, Chih-Wei L.; Huang, Lei; Hughes, David H.; 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; Keating, Garrett K.; Kettenis, Mark; Kim, Jae-Young; Kim, Junhan; Kim, Jongsoo; Kino, Motoki; Koay, Jun Yi; Koch, Patrick M.; Koyama, Shoko; Kramer, Michael; Kramer, Carsten; Krichbaum, Thomas P.; Kuo, Cheng-Yu; Lauer, Tod R.; Sang-Sung., Lee; Li, Yan-Rong; Li, Zhiyuan; Lico, Rocco; Lindqvist, Michael; Liu, Kuo; Liuzzo, Elisabetta; Lo, Wen-Ping; Lobanov, Andrei P.; Loinard, Laurent Loinard; Lonsdale, Colin; Lu, Ru-Sen; MacDonald, Nicholas R.; Markoff, Sera; Mao, Jirong; Marrone, Daniel P.; Marscher, Alan P.; Marti-Vidal, Ivan; Matsushita, Satoki; Matthews, Lynn D.; Medeiros, Lia; Menten, Karl M.; Mizuno, Izumi; Moran, James M.; Moriyama, Kotaro; Nagai, Hiroshi; Nakamura, Masanori; Nagar, Neil M.; Narayan, Ramesh; Narayanan, Gopal; Natarajan, Iniyan; Neri, Roberto; Ni, Chunchong; Noutsos, Aristeidis; Okino, Hiroki; Ortiz-Leon, Gisela N.; Oyama, Tomoaki; Ozel, Feryal; Palumbo, Daniel C.M.; Park, Jongho; Patel, Nimesh; Pen, Ue-Li; Pesce, Dominic W.; Plambeck, Richard; Piétu, Vincent; PopStefanija, Aleksandar; Porth, Oliver; Preciado-Lopez, Jorge A.; Psaltis, Dimitrios; Ramakrishnan, Venkatessh; Rao, Ramprasad; Rawlings, Mark G.; Raymond, Alexander W.; Rezzolla, Luciano; Roelofs, Freek; Rogers, Alan; Ros, Eduardo; Rose, Mel; Roshanineshat, Arash; Rottmann, Helge; Roy, Alan L.; Ruszczyk, Chet; Rygl, Kazi L.J.; Sánchez, Salvador; Sánchez-Arguelles, David; Sasada, Mahito; Savolainen, Tuomas; Schuster, Karl-Friedrich; Schloerb, F. Peter; Shao, Lijing; Shen, Zhiqiang; Small, Des; Sohn, Bong Won; SooHoo, Jason; Tiede, Paul; Tazaki, Fumie; Tilanus, Remo P.J.; Titus, Michael; Toma, Kenji; Torne, Pablo; Trent, Tyler; Traianou, Thalia; Trippe, Sascha; Tsuda, Shuichiro; Van Langevelde, Huib Jan; Van Bemmel, Ilse; Van Rossum, Daniel R.; Wagner, Jan; Wardle, John; Wex, Norbert; Weintroub, Jonathan; Wharton, Robert; Wielgus, Maciek; Wong, George N.; Wu, Qingwen; Yoon, Doosoo; Young, Ken; Young, Andre; Yuan, Feng; Yuan, Ye-Fei; Zensus, J. Anton; Zhao, Guangyao; Zhao, Shan-Shan; Zhu, Ziyan (American Astronomical Society, 2020-07)
    The Event Horizon Telescope (EHT) Collaboration has recently produced the first resolved images of the central supermassive black hole in the giant elliptical galaxy M87. Here we report on tests of the consistency and ...