Browsing Natural and Agricultural Sciences by Title

Browsing Natural and Agricultural Sciences by Title

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  • Toxic effect of herbicides used for water hyacinth control on two insects released for its biological control in South Africa 
    Hill, Martin P.; Coetzee, Julie A.; Ueckermann, Claudia (Taylor & Francis, 2012-11)
    The integrated control of water hyacinth, Eichhornia crassipes (Martius) Solms- Laubach (Pontederiaceae) has become necessary in South Africa, as biological control alone is perceived to be too slow in controlling the ...
  • Toxic metals in oil sands : review of human health implications, environmental impact, and potential remediation using membrane-based approach 
    Ore, Odunayo T.; Adeola, Adedapo Oluwasanu (Springer, 2021-04)
    The upsurge in energy needs is the primary influencing factor for the shift of attention from conventional hydrocarbon resources to unconventional resources. In the process of exploiting unconventional oil resources such ...
  • Toxicity of synthetic and biological insecticides against adults of the Eucalyptus snout-beetle Gonipterus scutellatus Gyllenhal (Coleoptera: Curculionidae) 
    Echeverri-Molina, Derian; Santolamazza-Carbone, Serena (Springer, 2010-03)
    Toxicity by contact and by ingestion of lufenuron, flufenoxuron, lambda (k)-cyhalothrin, cypermethrin, thiamethoxam and five entomopathogenic insecticides (three formulations of Beauveria bassiana, a compound containing ...
  • Trace element analysis in precious metals using time resolved emission spectroscopy 
    Julsing, Martha Maria (University of Pretoria, 2005-09-06)
    Please read the abstract in the section 00front of this document
  • Trace element pollution of soils by abandoned gold mine tailings near Potchefstroom, South Africa 
    Aucamp, Paul-Johan (University of Pretoria, 2007-04-07)
    Please read the abstract in the section 00front of this document
  • Trace metal contamination impacts predicted functions more than structure of marine prokaryotic biofilm communities in an anthropized coastal area 
    Coclet, Clement; Garnier, Cedric; D’Onofrio, Sebastien; Durrieu, Gael; Pasero, Emilie; Le Poupon, Christophe; Omanovic, Dario; Mullot, Jean-Ulrich; Misson, Benjamin; Briand, Jean-Francois (Frontiers Media, 2021-02-19)
    Trace metal (TM) contamination in marine coastal areas is a worldwide threat for aquatic communities. However, little is known about the influence of a multi-chemical contamination on both marine biofilm communities’ ...
  • Trace metal enrichment observed in soils around a coal fired power plant in South Africa 
    Dalton, Amaris; Feig, Gregor Timothy; Barbe, Kaylin (National Association for Clean Air, 2018)
    A site assessment was conducted at a coal fired power plant in South Africa to determine whether surrounding soils were being enriched with trace metals resulting from activities at the power plant. It was found that ...
  • Traceability systems and origin based meat products in the South African sheep meat industry 
    Van der Merwe, Melissa; Kirsten, Johann F. (Routledge, 2015-01)
    In a consumer-driven world, consumers want to experience a connection between the product that they are consuming and the product’s origin. To guarantee the validity of this connection and therefore the origin attribute ...
  • Tracing factors that facilitate achievement in mathematics in traditionally disadvantaged secondary schools 
    Tsanwani, Avhasei Richard (University of Pretoria, 2009-06-02)
    The purpose of this study is to advance the understanding of why some mathematics classrooms in disadvantaged communities are successful and others not. The study was conducted in Limpopo Province in the northern part of ...
  • Tracing the role of human civilization in the globalization of plant pathogens 
    Santini, Alberto; Liebhold, Andrew; Migliorini, Duccio; Woodward, Steve (Nature Publishing Group, 2018-01)
    Co-evolution between plants and parasites, including herbivores and pathogens, has arguably generated much of Earth's biological diversity. Within an ecosystem, co-evolution of plants and pathogens is a stepwise reciprocal ...
  • Tracking data from nine free-roaming Cheetahs (Acinonyx jubatus) collared in the Thabazimbi area, Limpopo Province, South Africa 
    Marnewick, Kelly; Page-Nicholson, Samantha; Roxburgh, Lizanne; Somers, Michael J. (Pensoft Publishers, 2017-02-23)
    BACKGROUND : In partnership with the University of Pretoria, the Endangered Wildlife Trust's Carnivore Conservation Programme collared six male and three female free-roaming Cheetahs (Acinonyx jubatus) in the Thabazimbi ...
  • Tracking nucleotide-binding-site-leucine-rich-repeat resistance gene analogues in the wheat genome complex 
    Du Preez, Franco Bauer (University of Pretoria, 2008-09-23)
    Investigations into plant-pathogen interactions have provided us with several models underlying the genetic basis of host resistance in plants. In the past decade, tens of resistance genes have been isolated from numerous ...
  • Tracking of marine predators to protect Southern ocean ecosystems 
    Hindell, Mark A.; Reisinger, Ryan Rudolf; Ropert-Coudert, Yan; Huckstadt, Luis A.; Trathan, Philip N.; Bornemann, Horst; Charrassin, Jean-Benoit; Chown, Steven L.; Costa, Daniel P.; Danis, Bruno; Lea, Mary-Anne; Thompson, David; Torres, Leigh G.; Van de Putte, Anton P.; Alderman, Rachael; Andrews-Goff, Virginia; Arthur, Ben; Ballard, Grant; Bengtson, John; Bester, Marthan Nieuwoudt; Blix, Arnoldus Schytte; Boehme, Lars; Bost, Charles-Andre; Boveng, Peter; Cleeland, Jaimie; Constantine, Rochelle; Corney, Stuart; Crawford, Robert J.M.; Dalla Rosa, Luciano; De Bruyn, P.J. Nico; Delord, Karine; Descamps, Sebastien; Double, Mike; Emmerson, Louise; Fedak, Mike; Friedlaender, Ari; Gales, Nick; Goebel, Michael E.; Goetz, Kimberly T.; Guinet, Christophe; Goldsworthy, Simon D.; Harcourt, Rob; Hinke, Jefferson T.; Jerosch, Kerstin; Kato, Akiko; Kerry, Knowles R.; Kirkwood, Roger; Kooyman, Gerald L.; Kovacs, Kit M.; Lawton, Kieran; Lowther, Andrew D.; Lydersen, Christian; Lyver, Phil O’B.; Makhado, Azwianewi B.; Márquez, Maria E.I.; McDonald, Birgitte I.; McMahon, Clive Reginald; Muelbert, Monica; Nachtsheim, Dominik; Nordøy, Erling S.; Olmastroni, Silvia; Phillips, Richard A.; Pistorius, Pierre Anton; Plotz, Joachim; Putz, Klemens; Ratcliffe, Norman; Ryan, Peter G.; Santos, Mercedes; Southwell, Colin; Staniland, Iain; Takahashi, Akinori; Tarroux, Arnaud; Trivelpiece, Wayne; Wakefield, Ewan; Weimerskirch, Henri; Wienecke, Barbara; Xavier, Jose C.; Wotherspoon, Simon; Jonsen, Ian D.; Raymond, Ben (Nature Research, 2020-04)
    Southern Ocean ecosystems are under pressure from resource exploitation and climate change. Mitigation requires the identifcation and protection of Areas of Ecological Signifcance (AESs), which have so far not been ...
  • Tracking progress towards the sustainable development goals in four rural villages in Limpopo, South Africa 
    Wernecke, Bianca; Mathee, Angela; Kunene, Zamantimande; Balakrishna, Yusentha; Kapwata, Thandi; Mogotsi, Mirriam; Sweijd, Neville; Minakawa, Noboru; Wright, Caradee Yael (Ubiquity Press, 2021-02)
    BACKGROUND: Measuring national progress towards the Sustainable Development Goals (SDGs) enables the identification of gaps which need to be filled to end poverty, protect the planet and improve lives. Progress is typically ...
  • Tracking, targeting, and conserving soil biodiversity 
    Guerra, Carlos A.; Bardgett, Richard D.; Caon, Lucrezia; Crowther, Thomas W.; Delgado-Baquerizo, Manuel; Montanarella, Luca; Navarro, Laetitia M.; Orgiazzi, Alberto; Singh, Brajesh K.; Tedersoo, Leho; Vargas-Rojas, Ronald; Briones, Maria J.I.; Buscot, Francois; Cameron, Erin K.; Cesarz, Simone; Chatzinotas, Antonis; Cowan, Don A.; Djukic, Ika; Van den Hoogen, Johan; Lehmann, Anika; Maestre, Fernando T.; Marin, Cesar; Reitz, Thomas; Rillig, Matthias C.; Smith, Linnea C.; De Vries, Franciska T.; Weigelt, Alexandra; Wall, Diana H.; Eisenhauer, Nico (American Association for the Advancement of Science, 2021-01)
    Nature conservation literature and policy instruments mainly focus on the impacts of human development and the benefits of nature conservation for oceans and aboveground terrestrial organisms (e.g., birds and plants) and ...
  • The trade-off between chain performance and fragility considering coordination strategies of agri-food chains : a South African egg chain’s case study 
    Setene, Letlama; Jordaan, Daniel Du Plessis Scheepers (Wageningen Academic Publishers, 2021)
    The mainstream strategy in the coordination of agri-food chains has traditionally focused more on the enhancement of chain performance by adopting lean and highly integrated strategies. These strategies are premised on ...
  • Trade-offs between immunity and testosterone in male African ground squirrels 
    O'Brien, Kelsey A.; Waterman, Jane M.; Anderson, W. Gary; Bennett, Nigel Charles (Company of Biologists, 2018-08)
    The immunocompetence handicap hypothesis (ICHH) proposes that testosterone has both beneficial effects on male reproductive potential and negative effects by suppressing the immune system. However, support for the ICHH ...
  • Trade-offs of predation and foraging explain sexual segregation in African buffalo 
    Hay, C.T.; Cross, Paul C.; Funston, Paul J. (Blackwell, 2008)
    Many studies have investigated why males and females segregate spatially in sexually dimorphic species. These studies have focused primarily on temperate zone ungulates in areas lacking intact predator communities, and few ...
  • Trading mortality 
    Simpson, Nathaniel (University of Pretoria, 2012-07-03)
    This dissertation sets out to describe a set of financial instruments whose cash flows are driven by the movements in some underlying population's mortality rates. For example, a longevity bond where the coupons are ...
  • Trading new neurons for status : adult hippocampal neurogenesis in eusocial Damaraland mole-rats 
    Oosthuizen, Maria Kathleen; Amrein, I. (Elsevier, 2016-06)
    Diversity in social structures, from solitary to eusocial, is a prominent feature of subterranean African mole-rat species. Damaraland mole-rats are eusocial, they live in colonies that are characterized by a reproductive ...