University of Port Elizabeth

About: University of Port Elizabeth is a based out in . It is known for research contribution in the topics: Population & Estuary. The organization has 1067 authors who have published 1538 publications receiving 38560 citations. The organization is also known as: UPE & Universiteit van Port Elizabeth.

Complexes of rhenium(V) with aminoacetophenones and their reactions with some bidentate ligands

Abstract: Complexes of rhenium(V) with 2-, 3- and 4-aminoacetophenone (H2aap) have been synthesized. The reaction of trans-ReOCl3(PPh3)2 with 2-H2aap in benzene yielded the imido complex [Re(2-aap)Cl3(PPh3)], in which the oxo oxygen and one of the PPh3 groups were substituted by the dianionic imido nitrogen and the neutral ketonic oxygen, respectively. With 3- and 4-H2aap the imido complexes trans-[Re(aap)Cl3(PPh3)2] were isolated. The monodentate coordination mode of these latter two ligands was authenticated by the X-ray crystal structure of trans-[Re(3-aap)Cl3(PPh3)2]; crystals are triclinic, P1, with a = 10.567(5), b = 11.989(6), c = 18.739(8) A, α= 74.82(4)o, β= 75.27(4)o, γ= 73.15(4)o, U = 2152(2) A3, Z = 2, R = 0.0469. The further reaction of [Re(3-aap)Cl3(PPh3)2] with the bidentate ligands 2-aminophenol and 8-hydroxyquinoline (HL) led to the isolation of complexes of the type [Re(3-aap)Cl2(PPh3)(L)]. However, with 1,2-diaminobenzene (H2dab), the 3-aap imido moiety was displaced by the imido group {N(C6H4)NH2}, to give the complex trans-[Re(dab)Cl3(PPh3)2]. (Bulletin of The Chemical Society of Ethiopia: 2002 16 (2): 149-156)

Determinations of the reproductive output of populations of a thalassinid prawn Upogebia africana (Ortmann) in the Swartkops estuary

Abstract: Populations of large and 'stunted' (adult carapace lengths = 17,0-24,0 and 12,0-19,0 mm respectively) Upogebia africana were regularly and quantitatively sampled in the Swartkops estuary. At the site with 'stunted' prawns a well-defined spring (July to October) and summer (December to March) breeding cycle was recorded. The 'stunted' female prawns produced two broods of eggs per annum and the brood size ranged from about 305 to 2282 eggs depending on the size of the female. At the site with large prawns the spring and summer breeding cycles tended to merge, forming a longer breeding season, with the adult females apparently producing three broods of eggs per annum. The brood size of these females ranged from about 1304 to 4819 eggs.

The nutrient status of the agriculturally impacted Gamtoos Estuary, South Africa, with special reference to the river‐estuarine interface region (REI)

Abstract: 1. Ecological water reserves are part of the new water management philosophy in South Africa. The estuaries are threatened by excessive water abstraction from their rivers and the consequent reduction in freshwater input. This study was conducted to further improve our understanding of freshwater requirements in terms of nutrients for South African estuaries. 2. The Gamtoos Estuary was sampled between November 1996 and November 1998 to determine its nutrient status and freshwater input rates. Furthermore, the possible existence of a distinct river-estuarine interface (REI) in terms of nutrients has been investigated. Nutrients analysed included phosphate, nitrate, nitrite, ammonia, dissolved organic nitrogen (DON), dissolved organic carbon (DOC), particulate organic nitrogen (PON) as Kjieldahl nitrogen, total particulate phosphorus and total particulate carbon. 3. The Gamtoos River was found not to be the ultimate source of nutrients to the estuary, but non-point sources such as the seepage of fertilisers from adjacent agricultural fields determined to a great extent the nutrient status of the estuary. 4. Results showed that it was not possible to identify a defined river-estuarine interface region for all nutrients. Most were measured in higher concentrations in the lower salinity reaches (<17‰) where we observed the combined effect of inputs from the Gamtoos River, an agricultural drainage pipe, and fertilizer seepage from non-point sources on nutrient concentration. 5. Prolonged water withdrawal for human use impacts the continuous renewal of the nutrient pool so important to other South African estuaries with relative pristine catchment areas. However, reduced fresh water inputs could enhance eutrophication in polluted estuaries due to a decreased flushing potential of the estuary. In this case the Gamtoos Estuary has a freshwater requirement for freshets and floods to “clean” the estuary of accumulated nutrients and other organic material. 6. This should be a consideration in further freshwater abstraction policies. Conservation issues arise since the Gamtoos Estuary is one of the few permanently open estuaries along the South African coast and serve in this study as an example and as a first attempt to relate freshwater requirements to nutrient dynamics in a South African context. Copyright © 2002 John Wiley & Sons, Ltd.

Measuring consumer attitudes towards gambling

Abstract: The main objective of this study was to measure consumer attitudes towards gambling amongst various sociodemographic groups in Port Elizabeth. The study was based on past research and used a modified version of a questionnaire developed by various authors. The sample (N=355) was drawn, using a non-probability sampling technique from English, Afrikaans and Xhosa speaking respondents in the Port Elizabeth Uitenhage area. Fieldwork was carried out by students of Industrial Psychology at the University of Port Elizabeth. Results showed significant differences between socio-demographic groups regarding attitudes towards gambling. Cultural influences deduced from home language and religion seems to influence gambling attitudes in particular. These results have important implications for the gaming industry and welfare organisations. Opsomming Die hoof doelstelling van hierdie studie was om verbruikerhoudings ten opsigte van dobbel onder verskeie sosiodemografiese groepe in Port Elizabeth te ondersoek. Die studie is gegrond op vorige navorsing in die veld en maak gebruik van n aangepaste vraelys, ontwikkel deur verskeie outeurs. ‘n Nie-ewekansige steekproef (N=355) is getrek uit Engels, Afrikaans en Xhosa-sprekende respondente in die Port Elizabeth Uitenhage gebied. Veldwerk is uitgevoer deur Bedryfsielkunde studente van die Universiteit van Port Elizabeth. Bevindinge toon beduidende verskille tussen sosio-demografiese groepe ten opsigte van houdings oor dobbel. Kultuurinvloede afgelei uit taal en godsdiens blyk om dobbelhoudings te beinvloed. Die resultate het belangrike implikasies vir die dobbelspelbedryf en welsynsorganisasies.