Browsing Natural and Agricultural Sciences by Title

Browsing Natural and Agricultural Sciences by Title

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  • Net effects of multiple stressors in freshwater ecosystems : a meta-analysis 
    Jackson, Michelle C.; Loewen, Charlie J.G.; Vinebrooke, Rolf D.; Chimimba, Christian Timothy (Wiley, 2016-01)
    The accelerating rate of global change has focused attention on the cumulative impacts of novel and extreme environmental changes (i.e. stressors), especially in marine ecosystems. As integrators of local catchment and ...
  • Net loss of endangered humpback dolphins : integrating residency, site fidelity, and bycatch in shark nets 
    Atkins, Shanan; Cantor, Maurício; Pillay, Neville; Cliff, Geremy; Keith, Mark; Parra, Guido J. (Inter Research, 2016-08)
    Fisheries bycatch—the incidental catch of non-target species during fishing—is problematic for large marine vertebrates. Bather protection programmes that use gillnets to kill sharks cause the incidental mortality of ...
  • Network modelling unravels mechanisms of crosstalk between ethylene and salicylate signalling in potato 
    Ramsak, Živa; Coll, Anna; Stare, Tjaša; Tzfadia, Oren; Baebler, Špela; Van de Peer, Yves; Gruden, Kristina (American Society of Plant Biologists, 2018-09)
    To develop novel crop breeding strategies, it is crucial to understand the mechanisms underlying the interaction between plants and their pathogens. Network modeling represents a powerful tool that can unravel properties ...
  • Network structure indirect losses and financial contagion in inhomogeneous stochastic interbank networks 
    Walters, Nadine Mari (University of Pretoria, 2019)
    We introduce new tiered bank network structures, allowing for many di erent bank sizes, and compare risk propagation in these structures with the well-known Erd˝os-R´enyi, assortative and disassortative structures. The ...
  • Network topology of stable isotope interactions in a sub-arctic raptor guild 
    Dalerum, Fredrik; Hellström, P.; Miranda, M.; Nyström, J.; Ekenstedt, J.; Angerbjörn, A. (Springer, 2016-10)
    Predation is an ecologically important process, and intra-guild interactions may substantially influence the ecological effects of predator species. Despite a rapid expansion in the use of mathematical graph theory to ...
  • Network-based identification of adaptive pathways in evolved ethanol-tolerant bacterial populations 
    Swings, Toon; Weytjens, Bram; Schalck, Thomas; Bonte, Camille; Verstraeten, Natalie; Michiels, Jan; Marchal, Kathleen (Oxford University Press, 2017-11)
    Efficient production of ethanol for use as a renewable fuel requires organisms with a high level of ethanol tolerance. However, this trait is complex and increased tolerance therefore requires mutations in multiple genes ...
  • Neural networks for time series analysis 
    Du Plessis, K (University of Pretoria, 2007-02-23)
    The analysis of a time series is a problem well known to statisticians. Neural networks form the basis of an entirely non-linear approach to the analysis of time series. It has been widely used in pattern recognition, ...
  • Neuroendocrine correlates of sex-role reversal in barred buttonquails 
    Voigt, Cornelia (The Royal Society, 2016-11)
    Sex differences in brain structure and behaviour are well documented among vertebrates. An excellent model exploring the neural mechanisms of sex differences in behaviour is represented by sex-role-reversed species. In the ...
  • Neurokinin 3 receptor antagonism decreases gonadotropin and testosterone secretion in healthy men 
    Skorupskaite, Karolina; George, Jyothis T.; Veldhuis, Johannes D.; Millar, Robert P.; Anderson, Richard A. (John Wiley & Sons Ltd., 2017-12)
    OBJECTIVE : Patients with mutations of neurokinin B (NKB) and its receptor show hypogonadotrophic hypogonadism, but there is little evidence for the importance of this pathway in reproductive function in normal men, or ...
  • Neurokinin 3 receptor antagonism reveals roles for neurokinin B in the regulation of gonadotropin secretion and hot flashes in postmenopausal women 
    Skorupskaite, Karolina; George, Jyothis T.; Veldhuis, Johannes D.; Millar, Robert P.; Anderson, Richard A. (Karger, 2018-04-05)
    OBJECTIVES : Neurokinin B (NKB) and kisspeptin are obligate for normal gonadotropin secretion, and links between gonadotropin- releasing hormone (GnRH) pulsatility and vasomotor symptoms have been proposed. Using a ...
  • Neurokinin B signaling in the female rat : a novel link between stress and reproduction 
    Grachev, Pasha; Li, X.F.; Hu, M.H.; Li, S.Y.; Millar, Robert P.; Lightman, Stafford L.; O'Byrne, Kevin T. (The Endocrine Society, 2014-04-07)
    Acute systemic stress disrupts reproductive function by inhibiting pulsatile gonadotropin secretion. The underlying mechanism involves stress-induced suppression of the GnRH pulse generator, the functional unit of which ...
  • Neutral hydrogen in the archetype post-merger : dual active galactic nucleus system NGC 6240 
    Santana, Karina Caitlin (University of Pretoria, 2022)
    NGC 6240 is a prototypical merger system in the nearby universe hosting a dual active galactic nucleus. It is a well studied object and has been observed across the electromagnetic spectrum using most major ground- and ...
  • Neutral processes underlying the macro eco-evolutionary dynamics of mixed-ploidy systems 
    Kauai, Felipe; Mortier, Frederik; Milosavljevic, Silvija; Van de Peer, Yves; Bonte, Dries (Royal Society, 2023-03)
    Polyploidy, i.e. the occurrence of multiple sets of chromosomes, is regarded as an important phenomenon in plant ecology and evolution, with all flowering plants likely having a polyploid ancestry. Owing to genome shock, ...
  • Neutralizing antibodies against Rift Valley fever virus in wild antelope in far northern KwaZulu-Natal, South Africa, indicate recent virus circulation 
    Van den Bergh, Carien; Venter, Estelle Hildegard; Swanepoel, Robert; Hanekom, Catharine C.; Thompson, P.N. (Peter N.) (Wiley, 2020-05)
    Rift Valley fever (RVF) is a zoonotic viral disease of domestic ruminants in Africa and the Arabian Peninsula caused by a mosquito‐borne Phlebovirus. Outbreaks in livestock and humans occur after heavy rains favour breeding ...
  • Neutron irradiation effects in SiC 
    Brink, D.J.; Malherbe, Johan B.; Camassel, J. (Elsevier, 2009)
    SiC is a wide band gap semiconductor material with potential applications in harsh environmental conditions. In this work we investigate the effects of neutron irradiation on the properties of two SiC polytypes. Changes ...
  • New acremonium-like species in the Bionectriaceae and Plectosphaerellaceae 
    Giraldo, Alejandra; Gené, Josepa; Sutton, Deanna A.; Wiederhold, Nathan; Guarro, Josep (Springer, 2017-04)
    Several molecular studies have demonstrated that species traditionally assigned to the form genus Acremonium are polyphyletic, while Acremonium sensu stricto is a central element of the Bionectriaceae (Hypocreales). ...
  • New alk(en)ylhydroxycyclohexanes with tyrosinase inhibition potential from Harpephyllum caffrum Bernh. gum exudate 
    Bodede, Olusola; More, Garland K.; Moodley, Roshila; Steenkamp, Paul; Baijnath, Himansu; Maharaj, Vinesh J.; Prinsloo, Gerhard (MDPI, 2022-06-15)
    This work presents the first report on the phytochemical investigation of Harpephyllum caffrum Bernh. gum exudate. A known cardanol, 3-heptadec-120-Z-enyl phenol (1) and three new alk(en)ylhydroxycyclohexanes, namely, ...
  • New amidated 3,6-diphenylated imidazopyridazines with potent antiplasmodium activity are dual inhibitors of Plasmodium phosphatidylinositol-4-kinase and cGMP-dependent protein kinase 
    Cheuka, Peter Mubanga; Centani, Luyanda; Arendse, Lauren B.; Fienberg, Stephen; Wambua, Lynn; Renga, Shoneeze S.; Dziwornu, Godwin Akpeko; Kumar, Malkeet; Lawrence, Nina; Taylor, Dale; Wittlin, Sergio; Coertzen, Dina; Reader, Janette; Van der Watt, Mariette Elizabeth; Birkholtz, Lyn-Marie; Chibale, Kelly (American Chemical Society, 2021-01)
    Recent studies on 3,6-diphenylated imidazopyridazines have demonstrated impressive in vitro activity and in vivo efficacy in mouse models of malaria infection. Herein, we report the synthesis and antiplasmodium evaluation ...
  • New and interesting chaetothyrialean fungi from Spain 
    Madrid, H.; Hernandez-Restrepo, Margarita; Gené, J.; Cano, J.; Guarro, J.; Silva, V. (Springer, 2016-10)
    In the course of taxonomic studies on saprobic microfungi from Spain, several slow-growing, dematiaceous hyphomycetes were isolated from soil, submerged plant material and river sediments. Sixteen of these strains were ...
  • New and interesting fungi. 4 
    Crous, Pedro W.; Hernandez-Restrepo, H.; Schumacher, R.K.; Cowan, Don A.; Maggs-Kolling, G.; Marais, E.; Wingfield, Michael J.; Yilmaz, Neriman; Adan, O.C.G.; Akulov, A.; Alvarez Duarte, E.; Berraf-Tebbal, A.; Bulgakov, T.S.; Carnegie, A.J.; De Beer, Z. Wilhelm; Decock, C.; Dijksterhuis, J.; Duong, Tuan A.; Eichmeier, A.; Hien, L.T.; Houbraken, J.A.M.P.; Khanh, T.N.; Liem, N.V.; Lombard, L.; Lutzoni, F.M.; Miadlikowska, J.M.; Nel, Wilma Janine; Pascoe, I.G.; Roets, F.; Roux, Jolanda; Samson, R.A.; Shen, M.; Spetik, M.; Thangavel, R.; Thanh, H.M.; Thao, L.D.; Van Nieuwenhuijzen, E.J.; Zhang, J.Q.; Zhang, Y.; Zhao, L.L.; Groenewald, Johannes Zacharias (Westerdijk Fungal Biodiversity Institute, 2021-04-28)
    An order, family and genus are validated, seven new genera, 35 new species, two new combinations, two epitypes, two lectotypes, and 17 interesting new host and / or geographical records are introduced in this study. Validated ...