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Rhodes eResearch Repository (2.274 recursos)
Repository of the academic and research output of the Rhodes University community.

Mostrando recursos 1 - 20 de 439

1. Concerning secondary thermoluminescence peaks in ?-Al_2_O_3_:C - Chithambo, M.L.
Thermoluminescence characteristics of two subsidiary glow peaks, one below 100°C and the other above 300°C, have been studied for measurements between 30°C and 500°C in ?-Al_2_O_3_:C.

2. Particle precipitation effects in the daytime E-region in the South Atlantic Anomaly region - Haggard, R.
Enhanced production rates due to precipitated electrons were calculated from the observed data and compared well with the production rates from the mean electron fluxes in the range 0.2–26 keV observed from the satellite AtmosphereExplorer-C during 1973–77, discussed by Gledhill and Hoffman.1 The present study shows that there is evidence of a significant source of extra ionization, in addition to solar ultraviolet and X-radiation, in the South Atlantic Anomaly region.

3. Neural network-based ionospheric modelling over the South African region - McKinnell, Lee-Anne; Poole, Allon W.V.
During the past decade, South African scientists have pioneered research in the field of ionospheric modelling using the technique of neural networks (NNs).

4. 100 years of chemistry at Rhodes University - Brown, Michael Ewart; Eve, D.J.; Kaye, Perry T.; Rivett, D.E.A.; Watkins, G.M.
Although the Chemistry Department was one of the founding departments, coverage in the official histories is minimal and sometimes inaccurate or misleading.

5. Evidence for Archaean lamprophyre from the Kaapvaal Craton, South Africa - Prevec, Stephen A.; Anhaeusser, Carl R.; Poujol, Marc
A suite of mafic dykes occurs as a late component in a wellcharacterized trondhjemite–tonalite–diorite–granodiorite assemblage in the Johannesburg Dome of the central Kaapvaal Craton, southern Africa.

6. Rare earth element geochemistry of the Insizwa lobe of the Mount Ayliff Complex, Eastern Cape, South Africa - Marsh, J.S.
New rare earth element (REE) data from all lithologies of the Insizwa lobe, Mount Ayliff Complex, are presented.

7. The kaolinitic clay deposits on Beaconsfield, north of Grahamstown - Jacob, R.E.; Mitha, V.R.; MacPherson, D.
The Grahamstown clay deposits occur below the Grahamstown Formation silcrete, which forms a remnant of an extensive peneplain that developed on the African erosion surface during the Cretaceous–Tertiary period.

8. The Southern Ocean Group at Rhodes University: seventeen years of biological oceanography in the Southern Ocean reviewed - McQuaid, C.D.; Froneman, P.W.
A primary contribution has been the development of conceptual models of the physical-biological driving mechanisms that support enormous seasonal populations of land-based top predators at the Prince Edward Islands.

9. In situ feeding rates of the copepods, Pseudodiaptomushessei and Acartia longipatella, in a temperate, temporarily open/closed Eastern Cape estuary - Froneman, P.W.
Total integrated chl-a concentration ranged between 1.17 and 12.18 mg chl-a m^(–3) and was always dominated by small phytoplankton cells (<20 ?m), which comprised up to 86% (range 64–86%) of the total pigment.

10. Iris colour in passerine birds: why be bright-eyed? - Craig, A.J.F.K.; Hulley, P.E.
An initial survey of iris coloration in passerine birds (Aves: Passeriformes) showed that a brightly pigmented iris is much more common in southern African and Australian birds than in those from Europe, temperate North America, and Venezuela.

11. Mechanisms generating biological diversity in the genus Platypleura Amyot & Serville, 1843 (Hemiptera: Cicadidae) in southern Africa: implications of a preliminary molecular phylogeny - Villet, M.H.; Barker, N.P.; Lunt, N.
As a preliminary to such studies on the platypleurine cicada genus Platypleura, we sequenced 498 bases of the cytochrome oxidase I (COI) gene from thirteen African species.

12. Economic feasibility of an experimental octopus fishery in South Africa - Oosthuizen, Ané
Octopus vulgaris was identified as a new marine resource to be commercially exploited through an experimental fishery.

13. Genetic analysis of the Octopus vulgaris population on the coast of South Africa - Oosthuizen, Ané; Jiwaji, Meesbah; Shaw, Paul
Sequences from 21 samples from the Eastern Cape, and 14 samples from the Western Cape, were compared to determine whether different populations exist along the South African coast.

14. Evolution of Labeo victorianus predates the Pleistocenedesiccation of Lake Victoria: evidence from mitochondrialDNA sequence variation - Rutaisire, Justus; Booth, Anthony J.; Masembe, Charles; Nyakaana, Sylvester; Muwanika, Vincent B.
Geological data show that Lake Victoria dried out some 15 000 years ago.

15. One hundred years of botany at Rhodes University - Lubke, Roy; Brink, Estelle
The Botany Department of Rhodes University is located in the historic Schonland Building.

16. Quantification of the photosynthetic performance of phosphorus-deficient Sorghum by means of chlorophyll-a fluorescence kinetics - Ripley, Bradford Sherman; Redfern, Sally P.; Dames, Joanna F.
Chlorophyll fluorescence induction curves have been used as a sensitive tool for screening the photosynthetic performance of plants.

17. The microstructure of plasmodesmata in internodal stem tissue of the Saccharum hybrid var. NCo376: evidence for an apoplasmic loading pathway - Botha, C.E.J.; Cross, R.H.M.; Gerber, J.
The distribution, structure and functional state of plasmodesmata were investigated to gain a clearer understanding of the sucrose transport pathway to the storage parenchyma cells in stem tissue in Saccharum officinarum var.

18. Pollination biology of Bergeranthus multiceps (Aizoaceae) with preliminary observations of repeated flower opening and closure - Peter, Craig Ingram; Dold, A.P.; Barker, N.P.; Ripley, B.S.
In this study, observations were made on two populations of Bergeranthus multiceps (Salm-Dyck) Schwantes growing in the Eastern Cape province of South Africa.

19. A yellowwood by any other name: molecular systematics and the taxonomy of Podocarpus and the Podocarpaceae in southern Africa - Barker, N.P.; Muller, E.M.; Mill, R.R.
In particular, molecular data support the recognition of Afrocarpus as distinct from Podocarpus.

20. Mycorrhizal status of indigenous tree species in a forest biome of the Eastern Cape, South Africa - Hawley, Greer L.; Dames, Joanna F.
Mycorrhizal fungi are intimately associated with plant roots, affecting plant growth, health and increasing the plants' tolerance to environmental stress.

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