Browsing Faculty of Natural and Agricultural Sciences by Title

PAHs, OCPs and PCBs in sediments from three catchments in Durban, South Africa

Vogt, T.; Pieters, R.; Newman, B.K. (NISC, 2018)

Polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs) and polychlorinated biphenyls (PCBs) were analysed from sediment samples collected in 2012 from rivers, surface runoff canals and estuaries in three ...

Pairs trading on the Johannesburg Stock Exchange

Mashele, H.P.; Terblanche, S.E.; Venter, J.H. (Taylor & Francis, 2013)

Pairs trading strategies aim to profit from temporary deviations in some underlying relationship between the prices of two stocks. The trader takes appropriate long and short positions in the two stocks and waits for their ...

Palladium (II) complexes chelated by 1‐substituted‐4‐pyridyl‐1H‐1,2,3‐triazole ligands as catalyst precursors for selective ethylene dimerization

Joseph, Mohammed Cassiem; Swarts, Andrew John; Mapolie, Selwyn Frank (Wiley, 2020)

A series of neutral as well as cationic palladium methyl complexes bearing 1‐substituted‐4‐pyridyl‐1H‐1,2,3‐triazole ligands were prepared and fully characterized by a range of analytical techniques. Conventional and 2D ...

Palladium(II) and platinum(II) complexes of N-butyl-N-phenyldithiocarbamate: synthesis, characterization, biological activities and molecular docking studies

Onwudiwe, Damian C.; Mogwase, Boitumelo M.S.; Ekennia, Anthony C.; Olubiyi, Olujide O.; Hosten, Eric (Elsevier, 2016)

The reaction of ammonium N-butyl-N-phenyldithiocarbamate with the chloride salts of platinum and palladium, at room temperature, leads to the formation of [PtL2] and [PdL2](L = N-butyl-N-phenyldithiocarbamate). These ...

Panel-based nuclear and mitochondrial next-generation sequencing outcomes of an ethnically diverse pediatric patient cohort with mitochondrial disease

Schoonen, Maryke; Louw, Roan; Elson, Joanna L.; Van Dyk, Etresia; Jonck, Lindi-Maryn; Van der Westhuizen, Francois H. (Elsevier, 2019)

Mitochondrial disease (MD) is a group of rare inherited disorders with clinical heterogeneous phenotypes. Recent advances in next-generation sequencing (NGS) allow for rapid genetic diagnostics in patients who experience ...

PANGU (PAir-productioN Gamma-ray Unit): a high resolution gamma-ray space telescope

Wu, X.; Böttcher, M.; Chang, J.; Walter, R.; Su, M. (Sissa Medialab, 2015)

Paracetamol prevents hyperglycinemia in vervet monkeys treated with valproate

Viljoen, Jacques; Bergh, Jacobus J.; Mienie, Lodewyk J.; Terre'Blanche, Gisella; Kotzé, Herculaas F. (Springer, 2012)

Valproate administration increases the level of the inhibitory transmitter, glycine, in the urine and plasma of patients and experimental animals. Nonketotic hyperglycinemia (NKH), an autosomal recessive disorder of ...

Paradigm shift in engineering of pluvial floods: from historical recurrence intervals to risk-based design for an uncertain future

Haghighatafshar, Salar; Becker, Per; Moddemeyer, Steve; Persson, Andreas; Sörensen, Johanna (Elsevier, 2020)

Precipitation is intrinsically associated with high uncertainty, which is exacerbated exponentially over time—especially concerning climate change. However, the current design practice in urban drainage infrastructure ...

The paradox between technology adoption and student success: a case study

Venter, Emmerentia Hendrika Antoinetta; Prinsloo, P. (Unisa Press, 2011)

There are different factors influencing the adoption of technology in the service of learning in open and distance learning (ODL) in a developmental state such as South Africa. While there is ample reason to increasingly ...

Paragigagnathus iraniensis n. sp. (Acari: Phytoseiidae) from Western Iran

Khanjani, Mohammad; Ueckermann, Edward A.; Karimi, Mehdi; Asali Fayaz, Bahman (Acarologia, 2016)

A new species belonging to the family Phytoseiidae, Paragigagnathus iraniensis n. sp., is described and illustrated from specimens collected on almond trees, Prunus dulcis (Mill.) D.A. Webb (Rosaceae), infested with ...

Parasite diversity of African longfin eel Anguilla mossambica Peters with comments on host response to the monogenean Pseudodactylogyrus anguillae (Yin and Sproston)

McHugh, K.J.; Smit, N.J.; Weyl, O.L.F. (Wiley, 2017)

Parasite host-switching from the invasive American red-eared slider, Trachemys scripta elegans, to the native Mediterranean pond turtle, Mauremys leprosa, in natural environments

Meyer, Leon; Du Preez, Louis; Verneau, Olivier; Bonneau, Elodie; Héritier, Laurent (REABIC, 2015)

The red-eared slider turtle, Trachemys scripta elegans, is among the most over-exploited animals and is still exported annually from the USA all over the world. Once introduced into its new environment, feral populations ...

Parasite infection directly impacts escape response and stress levels in fish

Allan, Bridie J.M.; Sikkel, Paul C.; Illing, Björn; Fakan, Eric P.; Narvaez, Pauline (Company of Biologists, 2020)

Parasites can account for a substantial proportion of the biomass in marine communities. As such, parasites play a significant ecological role in ecosystem functioning via host interactions. Unlike macropredators, such ...

Parasite infestation increases on coral reefs without cleaner fish

Grutter, A.S.; Sikkel, P.C.; De Brauwer, M.; Bshary, R.; Cheney, K.L. (Springer, 2018)

Mutualisms are pivotal in shaping ecological communities. Iconic images of cleaner fish entering the mouths of predatory fish clients to remove ectoparasites epitomize their mutual benefit. Experimental manipulations of ...

Parasite responses to pollution: what we know and where we go in ‘ Environmental Parasitology ’

Sures, Bernd; Selbach, Christian; Nachev, Milen; Marcogliese, David J. (BioMed Central, 2017)

Environmental parasitology deals with the interactions between parasites and pollutants in the environment. Their sensitivity to pollutants and environmental disturbances makes many parasite taxa useful indicators of ...

Parasite-mediated enemy release and low biotic resistance may facilitate invasion of Atlantic coral reefs by Pacific red lionfish (Pterois volitans)

Tuttle, Lilian J.; Sikkel, Paul C.; Cure, Katherine; Hixon, Mark A. (Springer, 2017)

Successful invasions are largely explained by some combination of enemy release, where the invader escapes its natural enemies from its native range, and low biotic resistance, where native species in the introduced range ...