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Rhodes eResearch Repository (2,508 recursos)
Repository of the academic and research output of the Rhodes University community.

Mostrando recursos 41 - 60 de 511

41. Resistance or tolerance: An examination of aphid (Sitobion yakini) phloem feeding on Betta and Betta-Dn wheat (Triticum aestivum ) - De Wet, L.R.; Botha, C.E.J.
In this study, we examined the effects of aphid feeding on Russian wheat aphid-resistant and -susceptible cultivars of wheat (Triticum aestivum L.); Betta-Dn and Betta, respectively, by the grass aphid, Sitobion yakini (Eastop).

42. Towards reconciliation of structure with function in plasmodesmata—who is the gatekeeper? - Botha, C.E.J.; Cross, R.H.M.
We have examined chemically fixed plant material, and suggest that the conformational changes seen in plasmodesmatal substructure, particularly the deposition of electron-dense extra-plasmodesmal material, is linked to either manipulation of the hormonal balance (as in Avocado fruit), or of osmotic potential in leaf blade material.

43. Reduction in transport in wheat (Triticum aestivum) is caused by sustained phloem feeding by the Russian wheat aphid (Diuraphis noxia) - Botha, C.E.J.; Matsiliza, B.
The Russian wheat aphid (Diuraphis noxia) feeds preferentially from the phloem of longitudinal veins of nonresistant wheat leaves.

44. Late glacial and holocene palaeoclimatology of the Drakensberg of the Eastern Cape, South Africa - Lewis, C.A.
Eight climatic events during the Holocene are evidenced in the East Cape Drakensberg by fluvial, archaeological and palynological deposits.

45. Radiocarbon dates and the Late Quaternary palaeogeography of the Province of the Eastern Cape, South Africa - Lewis, C.A.
22,000 BP.

46. Protalus ramparts and the altitude of the local equilibrium line during the last glacial stage in Bokspruit, East Cape Drakensberg, South Africa - Lewis, C.A.
A ridge of unconsolidated debris at an altitude of 2000 m, located beneath cliffs in the East Cape Drakensberg of South Africa, is interpreted on morphological and sedimentological evidence as a protalus rampart.

47. The South African sugar industry - Lewis, C.A.
The sugar industry was established in Natal in the mid-nineteenth century.

48. Social parasitism by honeybee workers (Apis mellifera capensis Escholtz): host finding and resistance of hybrid host colonies - Neumann, Peter; Radloff, S.E.; Moritz, R.F.A.; Hepburn, H.R.; Reece, S.L.
We studied possible host finding and resistance mechanisms of host colonies in the context of social parasitism by Cape honeybee (Apis mellifera capensis) workers.

49. A re-evaluation of plastochron index determination in peas – a case for using leaflet length - Ade-Ademilua, O.E.; Botha, C.E.J.
The plastochron index (PI) is a measure of plant growth reports our findings on PI using the average length of and can be used to determine growth rate, based upon the first pair of leaflets on each node.

50. Aphid (Sitobion yakini) investigation shows thin-walled sieve tubes in barley (Hordeum vulgare L) to be more functional than thick-walled sieve tubes. - Matsiliza, B.; Botha, C.E.J.
Barley, like most other grasses that have been studied, contains two kinds of sieve tube.

51. A technique for evaluating species richness maps generated from collections data - Robertson, M.P.; Barker, N.P.
One application of these data is the production of species richness maps.

52. Travelling stallions in and adjacent to Brycheiniog - Lewis, C.A.
[From the introduction]: Horses played a major role in the transport system in Britain until, in the years following the conclusion of the First World War, they were gradually ousted by motor vehicles.

53. Comparison of extent and transformation of South Africa’s woodland biome from two national databases - Thompson, M.W.; Vink, E.R.; Fairbanks, D.H.K.; Ballance, A; Shackleton, C.M. (Charles Michael)
[From introduction] The recent completion of the South African National Land-Cover Database and the Vegetation Map of South Africa, Swaziland and Lesotho, allows for the first time a comparison to be made on a national scale between the current and potential distribution of ‘natural’ vegetation resources.

54. Selecting medicinal plants for cultivation at Nqabara on the Eastern Cape Wild Coast, South Africa - Keirungi, J.; Fabricius, C.
[From introduction:] The intensive harvesting of medicinal plants for commercial trade in South Africa poses a threat to many species.

55. The prevalence of use and value of wild edible herbs in South Africa - Shackleton, C.M. (Charles Michael)
The prevalence of use and commercial value of wild edible herbs in South Africa is examined from four recent quantitative studies at eight different sites.

56. Parasitic Cape bees in the northern regions of South Africa: source of the founder population - Neumann, Peter; Radloff, Sarah E.; Hepburn, H. Randall
Multivariate discriminant analyses of nine standard morphometric characters of honeybee workers were used to track the origin of a social parasitic pseudo-clone of thelytokous laying workers that have invaded colonies of Apis mellifera scutellata in South Africa.

57. The vegetation of the habitat of the Brenton blue butterfly, Orachrysops niobe (Trimen), in the Western Cape, South Africa - Lubke, Roy; Hoare, David; Victor, Janine; Ketelaar, Robert
The eggs of the butterfly are laid on the lower side of the leaves of Indigofera erecta, on which the larvae feed.

58. Fire behaviour in a semi-arid Baikiaea plurijuga savanna woodland on Kalahari sands in western Zimbabwe - Gambiza, James; Campbell, Bruce M.; Moe, Stein R.; Frost, Peter G.H.
Prescribed burning during the early dry season is a management strategy to reduce fuel loads and thus the incidence of intense fires during the late dry season.

59. A history of southern African research relevant to forensic entomology - Williams, K.A.; Villet, M.H.
Entomological forensic evidence has been used in southern Africa for decades but explicitly forensic research began in southern Africa only 26 years ago.

60. Review of South African research on volcanic and related rocks and mantle-derived materials : 1999-2002 - Marsh, J.S.
This report reviews South African research relating to the scientific interests of the International Association of Volcanology and Chemistry of the Earth's Interior (IAVCEI) and which was published between 1999 and 2002.

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