Browsing Natural and Agricultural Sciences by Title

Browsing Natural and Agricultural Sciences by Title

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  • 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 ...
  • Verification of South African Weather Service operational seasonal forecasts 
    Moatshe, Peggy Seanokeng (University of Pretoria, 2008)
    The South African Weather Service rainfall seasonal forecasts are verified for the period of January-February-March to October-November-December 1998-2004. These forecasts are compiled using different models from different ...
  • Verification of the ADMS 4 Air Quality Model in determining the SO2 dispersion during the 2006 and 2007 winter over Elandsfontein, South Africa 
    Ras, Marthinus Dewald Retief (University of Pretoria, 2013-01-10)
    ADMS 4 is a relatively new generation air quality dispersion model program written by Cambridge Environmental Research Consultants in the UK and used to verify datasets in the USA on several types of plants, in various ...
  • Verifying the ground treatment as proposed by the Secondary Permeability Index during dam foundation grouting 
    Jones, Brendon Ronald; Van Rooy, J.L. (Jan Louis); Mouton, Dawid J. (Springer, 2019-04)
    The Secondary Permeability Index (SPI) is a permeability-based rock mass classification, which when complemented with the degree of jointing can be employed as an approximation to the ground treatment design. However, when ...
  • Veronica plants-drifting from farm to traditional healing, food application, and phytopharmacology 
    Salehi, Bahare; Shetty, Mangalpady Shivaprasad; Kumar, Nanjangud V. Anil; Zivkovic, Jelena; Calina, Daniela; Docea, Anca Oana; Emamzadeh-Yazdi, Simin; Kılıç, Ceyda Sibel; Goloshvili, Tamar; Nicola, Silvana; Pignata, Giuseppe; Sharopov, Farukh; Del Mar Contreras, María; Cho, William C.; Martins, Natalia; Sharifi-Rad, Javad (MDPI, 2019-07)
    The Veronica genus, with more than 200 species, belongs to the Plantaginaceae family and is distributed over most of the Northern Hemisphere and in many parts of Southern Hemisphere. These plants are traditionally used in ...
  • Versatile silicone rubber samplers for trace organic analysis in a chromatography-mass spectrometry laboratory 
    Naude, Yvette (University of Pretoria, 2013)
    Extraction is required to separate and concentrate trace level analytes from the sample matrix prior to gas chromatography (GC). Classical extraction procedures utilise large amounts of hazardous solvents, generate waste, ...
  • Verslag bevestig dat kos se prys aansienlik gestyg het 
    Kirsten, Johann F.; Brand, Nellie (Beeld, 2006-07-19)
  • Verticillium wilt of potato in South Africa 
    Millard, Cornelia Philipina (University of Pretoria, 2005-07-05)
    Since the first report of Verticillium wilt of potato in 1950, the disease has been considered to be of minor importance in South Africa. Between 1995 and 2000, however, Verticillium spp. were isolated from 146 samples of ...
  • Verwerkte stapelkos duurder 
    Kirsten, Johann F.; Duvenhage, Hennie (Rapport, 2003-09-28)
  • The viability assessment of Microcystis aeruginosa cells after co-culturing with Bacillus mycoides B16 using flow cytometry 
    Gumbo, Jabulani Ray; Cloete, T.E. (Thomas Eugene), 1958-; Van Zyl, G.J.J.; Sommerville, Jaqui E.M. (Elsevier, 2014)
    Microcystis aeruginosa is the dominate cyanobacteria in freshwater bodies causing proliferation of toxic harmful algal blooms (HABs), worldwide. Thus a biological control method based on predatory bacteria is an alternative ...