https://commons.ru.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 https://commons.ru.ac.za/vital/access/manager/Repository/vital:42197 Wed 23 Jun 2021 09:36:39 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30807 Wed 17 Jan 2024 13:06:29 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41619 80 μg∙L-1, ≥ 2781 H. akashiwo cells∙mL-1). Dissolved oxygen differed significantly by bloom state, with the highest dissolved oxygen concentrations. Larval fish density, diversity and community structure variability were lower during hypereutrophic blooms compared to standard blooms and bloom absence, albeit statistically insignificant. Estuarine resident larval density was negatively correlated with dissolved oxygen concentration (P < 0.001). Dominant prey copepod of G. aestuaria larvae, P. hessei, was less abundant and variable during hypereutrophic blooms (mean: 664, range: 4-4301 individuals per m3) compared to standard blooms (mean: 950, range: 2-5237 individuals per m3) and bloom absence (mean: 1182, range: 23-7259 individuals per m3). Although HABs did not appear to drive a mismatch between prey and G. aestuaria larvae, early juvenile larvae made only a small contribution to the assemblage (0.2-1.8%). In terms of predator effects, yolk sac larvae were negatively related to R. terranatalis (P < 0.05). A significant positive relationship was found between prey, P. hessei and G. aestuaria preflexion (P < 0.001), flexion (P < 0.001) and postflexion (P < 0.05) larvae. In a world first, the effects of HABs were investigated on a larval fish species, Gilchristella aestuaria, using biochemical body condition analyses. During severe bloom conditions, G. aestuaria larvae were smaller and the assemblage consisted of mainly early developmental stages (stats). Body condition (RNA per dry weight) was poorest in the presence of hypereutrophic blooms (P < 0.001). A bell-curved relationship between RNA/DW and dissolved oxygen concentration was also produced in a 3-day time-lagged GAM (P < 0.001). In conclusion, hypereutrophic bloom conditions appeared to trigger adult G. aestuaria spawning in the upper mesohaline zone of the estuary in response to heightened primary productivity which occurs during the early bloom stage. However, reductions in copepod abundance (P. hessei) and unfavourable oxygen concentrations interfered with grow-out of G. aestuaria larvae. This research showed that HABs can alter nursery properties to the detriment of G. aestuaria larvae can have serious knock-on effects up the food chain. The loss in abundance of adult, juvenile and larval G. aestuaria, a key forage fish in South African estuaries, has major implications for estuarine food webs, especially in reduced prey availability to juvenile fishes and birds. There is still much to learn about the effects of HABs on the physiological and behavioural aspects on plankton communities worldwide.]]> Wed 13 Mar 2024 14:10:51 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:32483 Wed 13 Mar 2024 11:50:54 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30809 Wed 13 Mar 2024 10:54:08 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:32357 Wed 13 Mar 2024 10:12:28 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41606 Wed 13 Mar 2024 09:37:38 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36580 Wed 13 Mar 2024 09:30:27 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36483 Wed 12 May 2021 23:23:16 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28543 Wed 12 May 2021 23:16:16 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38190 Wed 12 May 2021 23:13:45 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:33920 Wed 12 May 2021 23:03:58 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39482 Wed 12 May 2021 22:33:26 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39810 Wed 12 May 2021 22:29:37 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36949 Wed 12 May 2021 22:27:54 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37038 Wed 12 May 2021 22:27:35 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38179 Wed 12 May 2021 20:50:21 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38191 Wed 12 May 2021 20:50:17 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39408 Wed 12 May 2021 20:27:28 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38335 Wed 12 May 2021 20:07:20 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:33385 Wed 12 May 2021 19:31:26 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28477 Wed 12 May 2021 19:31:26 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34126 Wed 12 May 2021 19:08:39 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36239 Wed 12 May 2021 18:11:36 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38189 Wed 12 May 2021 18:05:20 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:28902 Wed 12 May 2021 17:54:31 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:33029 10 and TPI between -1 and 1. Landslides are less pronounced on slope zones where slope gradient is <15˚ and >45˚, profile curvature <0, TWI <8 and >18, SPI <10 and TPI >1. Deep soil profiles ranging between 2.5 and 7 meters are a major characteristic of the study area. Soils are characterized by clay pans at a depth ranging between 0.75 and 3 meters within the profiles. The study area is dominated by clay texture, except for the uppermost surface horizons, which are loamy sand. All surface horizons analysed had the percentage of sand, silt and clay ranging from 33 to 55%, 22 to 40% and 10 to 30% respectively. In the deeper horizons, sand was observed to reduce drastically to less than 23%, while clay increased to greater than 50%. The clay content is very high in the deeper horizons exceeding 35%. By implication, such soils with a very high clay content and plasticity index are considered as Vertisols, with a profound influence in the occurrence of landslides. The top soil predominantly contains more quartz, while subsurface horizons have considerable amounts of illite/muscovite as the dominant clay minerals, ranging from 43% to 47 %. The liquid limit, plasticity index, computed weighted plasticity index (PIw), expansiveness (ɛex) and dispersion ranging from 50, 22, 17, 10 and 23 to 66, 44,34,54 and 64, respectively also have strong implications for landslide occurrence. Landslides are not normally experienced during or immediately after extreme rainfall events but occur later in the rainfall season. By implication, this time lag in landslide occurrence and rainfall distribution, is due to the initial infiltration through quartz dominated upper soil layers, before illite/muscovite clays in the lower soil horizons get saturated. Whereas forest cover reduced from 40 % in 1985 to 8% in 2015, cultivated land and settlements increased from 16% and 11% to 52% and 25% respectively during the same period. The distribution of cultivated land decreased in lower slope sections within gradient group < 15˚ by 59%. It however increased in upper sections within gradient cluster 25˚ to 35˚ by over 85% during the study period. There is a shift of cultivated land to the steeper sensitive upper slope elements associated with landslides in the study area. More than 50% of the landslides are occurring on cultivated land, 20% on settlements while less than 15 % and 10% are occurring on grassland and forests with degraded areas respectively. Landslides in Kigezi highlands are triggered by a complex interaction of multiple- factors, including dynamic triggers and ground condition variables. Topographic hollows are convergence zones within the landscape where all the parameters interact to cause landslides. Topographic hollows are therefore potential and actual landslide sites in the study area. Characterized by deep soil horizons with high clay content dominated by illite/muscovite minerals in the sub soils and profile concave forms with moderately steep slopes, topographic hollows are the most vulnerable slope elements to landslide occurrence. The spatial temporal patterns of landslide occurrence in the study area has changed due to increased cultivation of steep middle and upper slopes. Characterized by deep soil horizons with high clay content dominated by illite/muscovite minerals in the sub soils and profile concave forms with moderately steep slopes, topographic hollows are the most vulnerable slope elements to landslide occurrence. The spatial-temporal patterns of landslide occurrence in the study area has changed due to increased cultivation of steep middle and upper slopes. A close spatial and temporal correlation between land use/cover changes and landslide occurrence is discernible. The understanding of these topographical, pedological and land use/cover parameters and their influence on landslide occurrence is important in land management. It is now possible to identify and predict actual and potential landslide zones, and also demarcate safer zones for community activities. The information generated about the area’s topographic, pedological and land cover characteristics should help in vulnerability mitigation and enhance community resilience to landslide hazards in this fragile highland ecosystem. This can be done through designating zones for community activities while avoiding potential landslide zones. It is also recommended that, tree cover restoration be done in the highlands and the farmers encouraged to re-establish terrace farming while avoiding cultivation of sensitive steep middle and upper slope sections.]]> Wed 12 May 2021 17:50:51 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:31333 Wed 12 May 2021 17:50:28 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37050 Wed 12 May 2021 17:31:57 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39509 Wed 12 May 2021 17:20:28 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37047 Wed 12 May 2021 17:17:09 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36921 Wed 12 May 2021 17:12:16 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36665 Wed 12 May 2021 17:09:11 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30948 Wed 12 May 2021 16:47:38 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39515 Wed 12 May 2021 16:43:30 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37164 Wed 12 May 2021 16:42:14 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37161 Wed 12 May 2021 16:41:18 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:32479 Wed 12 May 2021 16:31:53 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36666 Wed 12 May 2021 16:27:26 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37158 Wed 12 May 2021 16:08:02 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40549 Wed 12 May 2021 15:12:07 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41618 Wed 12 May 2021 15:10:54 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41620 Wed 12 May 2021 15:05:32 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42111 Wed 12 May 2021 15:04:32 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40671 Wed 12 May 2021 15:03:43 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40735 Wed 12 May 2021 14:58:30 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40553 Wed 12 May 2021 14:52:51 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41595 Wed 12 May 2021 14:42:47 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41605 Wed 12 May 2021 14:32:55 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42873 Wed 12 May 2021 14:32:43 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40836 Wed 12 May 2021 14:22:24 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42329 Wed 12 May 2021 14:19:44 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42167 Wed 12 May 2021 14:18:55 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41615 Wed 12 May 2021 14:17:26 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41596 Wed 12 May 2021 14:14:01 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41621 Wed 12 May 2021 14:13:24 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40673 Wed 12 May 2021 14:05:55 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40674 Wed 12 May 2021 14:05:29 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40564 Wed 12 May 2021 13:59:58 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:42048 Wed 12 May 2021 13:59:14 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40743 Wed 12 May 2021 13:57:30 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:40524 Wed 12 May 2021 13:55:04 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41598 150 K) a divalent acceptor is extracted with an activation energy varying between samples based on compensation in a range of 90 meV to 70 meV. Photoluminescence measurements show four peaks with recombination mechanisms linked to the native acceptor identified in literature as either the gallium antisite and/or vacant gallium site. A fifth peak observed is attributed to the longitudinal phonon of the native acceptor. InAs and InAsSb epilayer are all grown at a temperature of 600 °C and cell pressure of 600 Torr. InAs is grown at a V/III ratio of 9.5 on GaAs substrate. Photoluminescence of the InAs layer shows two distinct peaks, one of which is an extrinsic band to band recombination. The other is attributed to free electron to acceptor or a donor-acceptor pair transition. An additional weak peak is also observed which is assigned to the longitudinal phonon of the band to band. InAsSb growth was conducted under a range of V/III ratios of 4.8 to 5, with a vapour phase composition of 0.4 to 0.435. Structural analysis via X-ray diffraction showed a 6 % to 12 % solid antimony content. Photoluminescence exhibited a single broad peak for all samples, with extended band tails. Temperature and power dependant analysis of luminescence indicated a convolution of extrinsic band to tail and band to band recombinations. Hall measurements indicated the InAsSb was n-type material with an apparent measured maximum mobility at 120 K of 9.5 × 103 cm2/V.s. and a room temperature apparent mobility of 7.5 × 103 cm2/V.s. Analysis of hall results using a two-layer model calculated a true bulk mobility of the epilayer at room temperature with an increased value of 15.4 × 103 cm2/V.s. The two-layer model details the effects of the surface conduction. From photoconductivity measurements and further analysis a resultant effective lifetime, at room temperature, was found to be on same order of magnitude as that of InAs materials. Application of a single Einstein oscillator extrapolated 0 K energy gaps for two samples of solid Sb contents of 6 % and 12 %, of 354 meV and 332 meV, respectively. Finally consideration was given to the growth of aluminium containing compounds, particularly AlGaSb. Multiple phases were observed under scanning electron microscope showing growth of GaSb regions surrounded by amorphous solid aluminium and/or aluminium oxide phases. The failure of the aluminium to incorporate into the desired crystal structure is speculated to be due to impure precursor introducing oxygen into the films. Additionally, the effectiveness of the gallium precursor compared to the aluminium precursor in helping the removal of the methyl groups at the growth surface, could also promote a preference for GaSb growth.]]> Wed 12 May 2021 13:53:32 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:41614 Wed 12 May 2021 13:48:44 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39669 Tue 24 May 2022 13:55:38 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37131 Tue 24 May 2022 13:27:37 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36184 Thu 14 Mar 2024 15:06:22 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30786 Thu 13 May 2021 13:38:18 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36926 Thu 13 May 2021 12:45:50 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39403 Thu 13 May 2021 08:54:11 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:32513 Thu 13 May 2021 08:52:29 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:37048 Thu 13 May 2021 08:47:30 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36664 NSN2 (148.55 mg/g) > NNN1 (131.88 mg/g) > NNN2 (75.87 mg/g). The bis-benzimidazole derivatives preference for metal ions was further investigated with a multi-element solution containing Rh(III), Ir(III), Pt(II), Pd(II) and Ni(II). The bis-benzimidazole derivatives showed the following order of loading capacity: NSN1 (47.28 mg/g) > NSN2 (23.89 mg/g) > NNN1 (17.47 mg/g) > NNN2 (14.91 mg/g) for Rh(III); NSN2 (10.64 mg/g) > NNN2 (6.84 mg/g) > NSN1 (5.74 mg/g) > NNN1 (5.02 mg/g) for Ir(III); NNN2 (33.96 mg/g) > NSN1 (30.95 mg/g) > NSN2 (19.95 mg/g) > NNN1 (14.92 mg/g) for Pt(II); NNN1 (47.94 mg/g) > NNN2 (28.90 mg/g) > NSN1 (16.22 mg/g) > NSN2 (15.83 mg/g) for Pd(II). Bis-benzimidazole derivatives showed no uptake of nickel(II) under these conditions. It was observed the ligand-selectivity order for Rh(III) was similar in both single-element and multi-element studies. This order showed that the bis-benzimidazoles containing a sulfur atom showed a high preference for rhodium(III) compared to Pt(II) which had a high preference for NNN2 as well as Pd(II) which had a high preference for NNN1. Ir(III) generally had a lower preference for the ligands presumably due to its higher kinetic inertness compared with Rh(III). Column sorption of [IrCl6]2- and [RhCl5(H2O)]2- on nanofibers functionalized with diammonium cations was carried out and the loading capacities of [IrCl6]2- were obtained. [RhCl5(H2O)]2- was not adsorbed by the sorbent materials while [IrCl6]2- was loaded onto the column. The loading capacities of [IrCl6]2- with the quaternary diammonium sorbent materials increased in the order of F-QuatDMDAMeBnz (60.29 mg/g) < F-QuatDMDABnz (67.61 mg/g) < F-QuatDMDACF3Bnz (107.59 mg/g) < F-QuatDMDANO2Bnz (140.47 mg/g). The loading capacity for Ir(IV) with quaternary diammonium cationic nanofibers increased with an increase in the electron-withdrawing nature of the quaternizing group. The charge delocalizing ability of the nitrobenzyl group resulted in the best interaction of the diammonium cation with [IrCl6]2-. Batch equilibrium studies were carried out to assess the efficiency of bis-benzimidazole chelating derivatives as adsorbents using a multi-metal solution (Rh(III), Ir(III), Pt(II), Pd(II) and Ni(II)) in 0.5 M HCl. The efficiency of the quaternary diammonium cations was tested using a binary metal solution (Ir(IV) and Rh(III)) in 6 M HCl. The isothermal batch adsorption studies of a multi-metal solution with bis-benzimidazoles derivatives fitted the Langmuir isotherm model which confirmed monolayer adsorption onto a homogeneous surface. The Langmuir isotherm parameter (qe (mg/g)), using functionalized nanofibers, showed the order of NNN2 (128.21 mg/g) > NSN1 (99.01 mg/g) > NSN2 (91.74 mg/g) > NNN1 (84.03 mg/g) for Pt(II); NNN1 (66.23 mg/g) > NNN2 (5.89 mg/g) > NSN1 (1.40 mg/g) > NSN2 (0.59 mg/g) for Pd(II); NSN2 (10.64 mg/g) > NNN2 (6.84 mg/g) > NSN1 (5.74 mg/g) > NNN1 (5.02 mg/g) for Ir(III); NSN1 (140.85 mg/g) > NSN2 (109.89 mg/g) > NNN1 (104.17 mg/g) > NNN2 (91.74 mg/g) for Rh(III). The pseudo-first-order kinetics model was found to be the best fit to describe the adsorption kinetics of all metal ions onto all the sorbent materials. K1 (min-1) value in pseudo-first-order kinetics showed the same order of adsorption as observed in the Langmuir isotherms. The isothermal batch adsorption studies of [IrCl6]2- and [RhCl5(H2O)]2- with quaternary diammonium cations fitted the Freundlich isotherm model and confirmed to be effective for multiple-layered adsorption onto a heterogeneous surface. The Freundlich isotherm parameter (kf (mg/g)) using functionalized quaternary diammonium cationic nanofibers increased in the order of F-QuatDMDANO2Bnz (794.33 mg/g) > F-QuatDMDACF3Bnz (185.35 mg/g) > F-QuatDMDABnz (156.32 mg/g) > F-QuatDMDAMeBnz (112.46 mg/g) for Ir(IV) uptake. F-QuatDMDANO2Bnz resin showed the highest adsorption than that of F-QuatDMDAMeBnz, F-QuatDMDABnz and F-QuatDMDACF3Bnz and this order is similar to what was observed in column studies. The quaternary diammonium cations were shown to have the highest adsorption capacity for Ir(IV) compared with Rh(III). The adsorption of Rh(III) was also observed to increase in the order of F-QuatDMDANO2Bnz (177.83 mg/g) > F-QuatDMDACF3Bnz (40.37 mg/g) > F-QuatDMDABnz (36.98 mg/g) > F-QuatDMDAMeBnz (12.71 mg/g). The pseudo-second-order kinetic model was found to be the best fit to describe the adsorption kinetics of both metal ions onto all the sorbent materials. K2 (g.mg-1min-1) value in pseudo-second-order kinetics showed the same order of adsorption as observed in the Freundlich isotherms. The adsorption studies showed adsorption takes place via chemisorption process. This thesis presents PGMs and iridium-specific materials that could be applied in solutions of secondary PGMs sources containing rhodium, platinum and palladium with bis-benzimidazoles as well as in feed solutions from ore processing with diammonium cations for iridium recovery.]]> Thu 13 May 2021 07:20:28 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36501 Thu 13 May 2021 07:19:19 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:32266 Thu 13 May 2021 06:46:04 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39514 Thu 13 May 2021 06:28:25 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:35489 Thu 13 May 2021 05:55:43 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36140 Thu 13 May 2021 05:47:12 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30950 Thu 13 May 2021 05:44:48 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:31640 Thu 13 May 2021 05:23:01 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34276 Thu 13 May 2021 05:07:10 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:33379 Thu 13 May 2021 05:00:45 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38259 Thu 13 May 2021 04:33:34 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:35756 Thu 13 May 2021 04:25:22 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:33941 Thu 13 May 2021 04:07:46 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36155 Thu 13 May 2021 02:25:13 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:31235 Thu 13 May 2021 02:19:18 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:35570 Thu 13 May 2021 02:07:00 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36128 Thu 13 May 2021 02:02:22 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36629 Thu 13 May 2021 01:56:47 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:39811 Thu 13 May 2021 01:49:35 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36590 Thu 13 May 2021 01:43:19 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36791 Thu 13 May 2021 01:32:02 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:31128 Thu 13 May 2021 01:09:19 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36574 Thu 13 May 2021 00:50:46 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:38260 Thu 13 May 2021 00:38:50 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:34047 Thu 13 May 2021 00:29:28 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36863 Thu 13 May 2021 00:04:38 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:30949 Fri 15 Mar 2024 13:00:57 SAST ]]> https://commons.ru.ac.za/vital/access/manager/Repository/vital:36690 Fri 15 Mar 2024 12:32:30 SAST ]]>