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Showing results 165401 to 165410 of 182197

  1. Tumour suppressor proteins in proliferating and differentiating cells
    Bodalina, Umesh Madan, 2014-03-05T11:20:24Z
    Cells have evolved the ability to change continuously and adapt to their environment. An important way in which this dynamic modulation is achieved is by reversible phosphorylation, mediated by protein kinases and phosphatases. This thesis focuses on the temporal variations in expression of the prot ...
  2. Representation of moon phases : a textbook analysis and case study of Grade 8 learners understanding
    Bhulana, Lubabalo Albert, 2014-03-05T11:30:08Z
    The aim of the study was to investigate the quality of diagrams and explanations of moon phases in grade 6 to 8 Natural Science textbooks; to establish whether the textbooks provide scientifically correct content information for learners and teachers and to investigate whether the textbooks used for ...
  3. Biodiversity, redundancy and resilience of riparian vegetation under different land management regimes.
    Kotschy, Karen Ann, 2014-03-05T11:37:02Z
    Biodiversity is widely thought to enhance resilience in ecosystems by providing ‘insurance’ which buffers the effects of disturbances on ecosystem functioning. However, little empirical evidence is available to support this assumption. Biodiversity and resilience are both complex, multifaceted co ...
  4. Structural, electrical and electronic properties of diamond like carbon (DLC) and carbon-based materials
    Mpingi, Wilfred Mbiombi, 2014-03-05T11:43:01Z
    this work, we have used the diamond-like carbon (DLC) also known as hydrogenated amorphous carbon (a-C:H), silicon doped DLC (a-C:H:Si) thin films deposited by the plasma enhanced chemical vapour deposition (PECVD) process on silicon substrate and studied their structural, electrical and electronic ...
  5. High-pressure megacrysts and lower crustal contamination: probing a mantle source for Proterozoic massif-type anorthosites
    Bybee, Grant Michael, 2014-03-05T11:49:30Z
    Many aspects of Proterozoic massif-type anorthosite petrogenesis have been, and remain, controversial. Mafic lower crust and depleted mantle have both been proposed as mutually exclusive sources of these near-monomineralic, temporally restricted batholiths. The debate surrounding the magma source ...
  6. Comparative investigation of airborne and ground-based radiometric survey techniques
    Larkin, James Francis Shenton, 2014-03-05T11:55:28Z
    An investigation was undertaken to compare airborne and ground-based radiometric survey techniques and to compare and contrast their relative merits and how they can be used in determining the environmental distribution of environmental radioisotopes, particularly those in the decay chains of 238 ...
  7. The origin and petrogenesis of the ultramafic enclaves at Unki mine, Selukwe Subchamber, Great Dyke, Zimbabwe
    Ncube, Sinikiwe, 2014-03-05T12:01:18Z
    The unique Selukwe Subchamber of the Great Dyke is bounded by the Shurugwi greenstone belt (SGB) on the west side for approximately 25 km and granitoids on the east side, as compared to other subchambers of the Great Dyke that are bounded on both sides by granitoids. It is also the narrowest section ...
  8. Ochre use at Sibudu Cave and its link to complex cognition in the Middle Stone Age
    Hodgskiss, Tamaryn Penny, 2014-03-05T12:07:35Z
    Ochre is found at many Middle Stone Age (MSA) sites and its use is often attributed by archaeologists to enhanced mental abilities and symbolism. However, the links between the visible uses of ochre, cognition and symbolism have not been clearly demonstrated. Here it is argued that by understandi ...
  9. Computational study of noble metal alloys
    Popoola, Adewumi Isaac, 2014-03-06T07:05:31Z
    The elastic constants, phase stability, heat of formation and the Debye temperature of various noble metal compounds in the stoichiometry A3B (where A = Pt, Ir, Rh, Ru, Pd and B = Al, Hf, Zr, Sc) were studied using the ab initio Density Functional Theory - Projector Augmented Wave method. A total ...
  10. Transport sector greenhouse gas inventory for South Africa for the base year 2009
    Tongwane, Mphethe Isaac, 2014-03-06T07:15:42Z
    e transport sector is responsible for a quarter of global CO2 emissions and the emissions continue to grow rapidly. The overall objective of this study was to calculate the following greenhouse gas emissions (GHG); CO2, CH4 and N2O from the transport sector in South Africa in the base year 2009. How ...