https://commons.ufh.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35643 Wed 13 Mar 2024 11:50:28 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35510 Wed 13 Mar 2024 11:43:34 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28395 Wed 12 May 2021 23:59:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:32262 Wed 12 May 2021 23:33:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35248 74 pMC). This implies that adjusting the 14C content in Dissolved Inorganic Carbon (DIC) based on its dilution by 14C free carbonates is influential in controlling the mixed groundwater ages, and that relatively older groundwater occurs at shallow depths in other parts of the study area possibly due to linked fault systems between deep and shallow aquifers. δ18O-δ2H relationships for the sampled groundwater suggest that groundwater samples collected within the main drainage of the Great Fish River plot close to the Global Meteoric Water Line (GMWL) indicating that the recharge water to this groundwater does not experience significant evaporation. The average isotope composition of the recharging water for the all of the sampled groundwater is -7.90 ‰ and -46.72 ‰ for δ18O and δ2H, respectively. This result plots halfway between rainwater 18O-2H relationship lines for the Indian Ocean and the Atlantic Ocean. This suggests that the rainwater from which the sampled groundwater was derived from evolved from both the Indian and Atlantic Ocean waters.]]> Wed 12 May 2021 23:31:13 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29242 Wed 12 May 2021 23:17:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28654 Wed 12 May 2021 23:04:28 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31218 Wed 12 May 2021 23:04:05 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36502 Wed 12 May 2021 23:03:49 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29447 Wed 12 May 2021 23:00:57 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38538 Wed 12 May 2021 23:00:38 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30710 Tue 15 Aug 2023 11:20:55 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36614 5m). This study aimed to address this information gap. Dive surveys were conducted along 10 m long transects (~3 reps) at three depth zones (<1m; 1-2m; > 2m) for four sites along the span of the ranching concession area. Similar assessments were done at a seeded site at the Noordhoek Ski Boat Club and an unseeded site at the Willows area, in order to reveal whether seeding had any impact on the benthic community. Images from a GoPro mounted in the centre of a framer unit (0.5 m2) were taken every 0.5 m along the transect. Macroalgal and macrofaunal cover was determined from these images, and the benthic community characterised from these data. Seaweed samples were taken for species identification. In the four baseline sites, sampling was done at three depth zones to note any changes with a depth gradient, both in terms of substrate type, as well as community composition. There was a notable trend with substrate type having a significant influence (P<0.05) on the community structure. Seaweed communities were dominated by Plocamium corallorhiza and coralline turf based on substrate types. There was also a significant relationship (P<0.05) between substrate type, dominant seaweed species and abalone presence. A Canonical Correspondence Analysis (CCA) of the community data suggested that the benthic community does not change significantly along the distance of coastline sampled. A hierarchical cluster analysis of Bray-Curtis dissimilarity for transect data also suggested that the four sites do not represent ecologically dissimilar communities. A similar analysis showed that abalone seeding had to date not altered the benthic community in shallow seeded areas from the community described for shallow unseeded areas. The study was used to describe the baseline benthic community in areas west of Cape Recife, examine the natural variability along the coast, and determine whether there are relationships between the benthic community composition and emergent abalone abundance. This information will be useful in selection of habitats for abalone seeding in the future. It is important that monitoring and surveying of the study area are to be continued in so allowing for long term data collection which will help in making informed decisions as well as documenting the impact in seeded areas when compared to unseeded areas.]]> Tue 12 Mar 2024 15:12:54 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:39995 Tue 07 May 2024 10:40:21 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29924 0.05), development or the active metabolic (P > 0.05) or metabolic scope (P > 0.05) of fish in the three treatments throughout the study. However, the standard metabolic rate was significantly higher in the year 2068 treatment but only at the flexion/post-flexion stage which could be attributed to differences in developmental rates (including the development of the gills) between the 2068 and the other two treatments. Overall, the metabolic scope was narrowest in the 2090 treatment, but varied according to life stage. Although not significantly different, metabolic scope in the 2090 treatment was noticeably lower at the flexion stage compared to the other two treatments, and the development appeared slower, suggesting that this could be the stage most prone to OA. The study concluded that, in isolation, OA levels predicted to occur between 2050 and 2090 will not negatively affect size-at-hatch, growth, development, and metabolic responses of larval A. japonicus up to 22 DAH (flexion/post-flexion stage). Taken together with the previous studies of the same species, the tipping point of tolerance (where negative impacts will begin) in larvae of the species appears to be between the years 2090 and 2100.]]> Thu 29 Sep 2022 12:56:05 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29119 Thu 13 May 2021 16:04:33 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:39878 Thu 13 May 2021 14:09:48 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31404 Thu 13 May 2021 12:43:26 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31194 Thu 13 May 2021 08:55:46 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31489 Thu 13 May 2021 08:49:59 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31075 Thu 13 May 2021 08:45:50 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38165 Thu 13 May 2021 08:18:02 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36224 Thu 13 May 2021 08:11:00 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31581 Thu 13 May 2021 07:38:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36485 Thu 13 May 2021 07:36:24 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30610 Thu 13 May 2021 07:33:34 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35965 Thu 13 May 2021 07:30:57 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36658 Thu 13 May 2021 07:26:04 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37135 Thu 13 May 2021 07:22:29 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36634 Thu 13 May 2021 07:12:42 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29165 Thu 13 May 2021 07:11:47 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36768 Thu 13 May 2021 07:09:40 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:34101 Fe. Masoke Iron Formation (Kanye Basin) which is stratigraphic correlative of The Ghaap Group and Chuniespoort Group of the Griqualand West basin and Transvaal basin, respectively. The Palaeoproterozoic Transvaal Supergroup in the Northern Cape Province of South Africa hosts high grade (>60% Fe) hematitic and specularitic iron and manganese mineralisation. It is therefore important to study and record the petrographic, mineralogy and geochemistry of Masoke Iron Formation, compare the results to the much known Kuruman and Griquatown Iron Formations. This study systematically investigate and record the petrography, mineralogy and geochemistry of all Masoke Iron Formation of Taupone Group in the Kanye Basin, which is stratigraphic correlative of The Ghaap Group and Chuniespoort Group of the Griqualand West basin and Transvaal basin, respectively. The further objective is to compare Masoke Iron Formation to the equivalent units in the Transvaal basin and Griqualand basin. In contrast to both Transvaal and Griqualand West Basin the Masoke iron Formation (Kanye Basin) has not been the subject of systematic scientific investigations. The study covers three main areas in the Kanye Basin: Keng Pan Area, Ukwi/Moretlwa hill and Janeng Hill Area. The mineralogy and geochemistry of these areas are presented in this study. Kanye Basin has a potential to host a large iron ore deposit, the geological setting in this area incorporates many of the elements necessary for iron ore formation. These include: banded iron formation (BIF), major unconformities with prolonged periods of weathering, carbonate sequences etc. In addition, several large deposits and mines are known from this area. This area can potentially have both hypogene and supergene enrichment of BIF. In this model, prospectively for new deposits is a function of the following: presence of iron formation units, proximity of mapped Asbestos Hills and Voëlwater BIF, thrust faulting (as indicated by the aero-magnetic interpretation), duplication of the ore horizon by folding, intersection of the BIF by major extensional fault, proximity of Olifantshoek/Waterberg outcrop, Gamagara unconformity, presence of carbonates (dolomites) and thin Kalahari sand cover. Major BIF units in the area of study include: the Masoke Iron Formation, equivalent to Kuruman Formation of the Asbestos Hills Subgroup, the Rooinekke iron formation of the Koegas Subgroup and the Hotazel Formation of the Voëlwater Subgroup. Supergene enrichment of these BIFs may occur wherever they are overlain by a major regional unconformity. The base of the Waterberg and the OlifantshoekSupergroups represent major unconformities in this regional target area. Potential for hypogene deposits is indicated by faulting (preferably extensional) proximal to BIF.]]> Thu 13 May 2021 07:06:47 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36169 Thu 13 May 2021 07:04:20 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31220 Thu 13 May 2021 06:48:55 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36631 Thu 13 May 2021 06:48:02 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30999 Thu 13 May 2021 06:47:16 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36633 Thu 13 May 2021 06:38:05 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36644 Thu 13 May 2021 06:34:57 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37091 Thu 13 May 2021 06:30:56 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36185 Thu 13 May 2021 06:28:28 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29539 Thu 13 May 2021 06:24:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38962 Thu 13 May 2021 06:22:36 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29788 Thu 13 May 2021 06:19:43 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36278 Thu 13 May 2021 06:19:04 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30765 Thu 13 May 2021 06:11:40 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30558 Thu 13 May 2021 06:10:31 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:39875 Thu 13 May 2021 06:04:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31391 Thu 13 May 2021 05:54:43 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:39880 Thu 13 May 2021 05:48:29 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36281 Thu 13 May 2021 05:47:40 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31228 Thu 13 May 2021 05:39:44 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35503 Thu 13 May 2021 05:24:48 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36929 Thu 13 May 2021 05:23:09 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31458 Thu 13 May 2021 05:22:16 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30027 5x105 K and >6x1021 W Hz-1 respectively. This work demonstrates that automated post-processing pipelines for wide-field, uniform sensitivity VLBI surveys are feasible and indeed made more efficient with new software, wide-field imaging algorithms and more purpose-built source- finders. This broadens the discovery space for future wide-field surveys with upcoming arrays such as the African VLBI Network (AVN), MeerKAT and the Square Kilometre Array (SKA).]]> Thu 13 May 2021 05:08:27 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31042 Thu 13 May 2021 05:08:16 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38192 Thu 13 May 2021 05:03:37 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30998 Thu 13 May 2021 04:57:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31398 Thu 13 May 2021 04:55:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:32745 Thu 13 May 2021 04:36:22 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37083 Thu 13 May 2021 04:35:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35221 Thu 13 May 2021 04:15:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:38186 Thu 13 May 2021 04:06:18 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:33996 Thu 13 May 2021 04:02:38 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36636 1500 m). Of these 21 sites, 17 were suitable for either methane analysis or groundwater sampling, with four of the Soekor boreholes unsuitable. The presence of methane in groundwater and being freely emitted seems to be a common occurrence above the Main Karoo basin and of the 17 sites investigated, 14 had freely emitted methane emission. All but one of these sites had δ13C-(CH4)g signatures greater than -50 ‰, indicating a thermogenic origin. Combining the results obtained from the Picarro instrument with those compiled by Talma & Esterhuyse (2015), a higher resolution distribution map was created. The δ13C-CH4 signatures show patterning with a decreasing trend from the southern Karoo Basin to the north, which corresponds to the general decrease in thermal maturity of the Ecca shales (Whitehill Formation) northward across the Karoo Basin. The δ13C-(CH4)d results from a case study conducted by Eymold et al. (2018) differ significantly with the data collected in this study that included several of the same sampling locations. This is explained by a two phase partitioning (gas + water) that leads to the thermogenic endmember of methane being released in its free state (analysed by Picarro G2201-i) and microbial methane that is formed in situ remains dissolved in the water (analysed by Eymold et al. 2018). Soekor and deep sites; SA 1/66, KA 1/66, and KWV-1 that have direct pathways for methane migration from the Whitehill are deemed the best proxies to resolve the thermogenic endmember of methane, with δ13C-(CH4)g signatures of -26.32‰, 31.66‰, and -34.57‰, respectively. The hydrochemistry results suggests that that free methane emissions do not necessarily have to be associated with saline Cl- waters, as multiple sites have CH4 emissions with low salinities (Cl < 50 mg/L) and that methane in its free state can migrate to the surface due to buoyancy. The results also indicate that dolerite intrusions act as conduits for upward migration of groundwater from depth, but that the deep groundwater signatures proposed by Murray et al., (2015) are related to their different migration pathways and water-rock interactions rather than being representative of the deep formation waters. Using an initial assessment δ13C-CH4, TOC concentration [TOC] and the tritium (3H) values, where water samples that have 3H ≤ 1 TU, detectable TOC and δ13C-CH4 signatures > -50‰ could indicate hydraulic connectivity between the shallow aquifer and an organic/CH4 rich sedimentary layer, which may or may not be from the Whitehill Formation. However, this method for determining aquifer connectivity requires further investigations in the Karoo Basin context. The results obtained in this study add to the limited isotopic data of methane across the Karoo Basin and demonstrates the effectiveness of an infield identification of methane emissions using the Picarro G2201-i.]]> Thu 13 May 2021 03:54:11 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30010 Thu 13 May 2021 03:52:20 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36612 Thu 13 May 2021 03:50:01 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30613 Thu 13 May 2021 03:47:30 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30563 Thu 13 May 2021 03:46:35 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30703 Thu 13 May 2021 03:32:02 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29207 Thu 13 May 2021 03:15:17 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:28686 Thu 13 May 2021 03:01:37 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35265 Thu 13 May 2021 02:59:46 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30550 Thu 13 May 2021 02:55:06 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30702 Thu 13 May 2021 02:19:48 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35347 Thu 13 May 2021 02:05:42 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36230 Thu 13 May 2021 02:05:00 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30557 Thu 13 May 2021 01:46:55 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29121 Thu 13 May 2021 01:46:43 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30022 Thu 13 May 2021 01:46:09 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37075 Thu 13 May 2021 01:37:11 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:30766 Thu 13 May 2021 01:36:46 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31625 Thu 13 May 2021 01:35:29 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36153 Thu 13 May 2021 01:25:28 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:34216 Thu 13 May 2021 01:21:34 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35460 Thu 13 May 2021 01:13:42 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37044 Thu 13 May 2021 01:13:31 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:31386 Thu 13 May 2021 00:57:15 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35505 Thu 13 May 2021 00:55:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:29249 Thu 13 May 2021 00:55:36 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:39883 Thu 13 May 2021 00:55:23 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36794 Thu 13 May 2021 00:52:12 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:36164 Thu 13 May 2021 00:51:19 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:34528 Thu 13 May 2021 00:32:13 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37049 Thu 13 May 2021 00:28:58 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:35351 Thu 13 May 2021 00:00:52 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37114 Mon 22 Aug 2022 15:05:56 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37128 Mon 22 Aug 2022 14:58:53 SAST ]]> https://commons.ufh.ac.za/vital/access/manager/Repository/vital:37087 1, antagonism, respectively. Most combination treatments showed to have an antagonistic effect except for cisplatin:BC-7 (1:3, 1:1, 2:1, 3:1) and cisplatin:A. afra (1:3, 1:2, 1:1, 3:1) combinations that showed synergism. The 1:2 ratio of cisplatin:BC-7 and the 2:1 ratio of cisplatin:A. afra were additive. CI values were also calculated at inhibition of 10, 25 and 75% of HeLa cell growth, for each combination mixture. Antagonistic effects were frequently observed at lower effect levels such as at 10 and 25% inhibition of growth. However, this was not seen for the cisplatin:BC-7 combinations as all the ratios indicated synergism. Some of these ratios, such as the 1:3 and 1:2, even led to a greater degree of synergism being obtained, with noticeable antagonistic effects seen at 50 and 75% inhibition of growth. The current finding is that BC-7 and A. afra could lower the dose of cisplatin in combination to achieve a similar anti-cancer efficacy compared to the higher cisplatin dose when used alone. The lower dosage in combination could result in reduced drug resistance as well as limit the toxicity on normal cells associated with cisplatin treatment. In conclusion, this study shows, for the first time, that A. nemorosa has the potential to induce apoptosis and also has some anti- and pro-inflammatory activity in HeLa cancer cells. This study also enhanced the knowledge of the mechanism of apoptosis induction of BC-7, in a more detailed manner, as well as investigated its inflammatory effects for the first time. Results obtained for A. afra correlated nicely to previously reported studies and confirmed that the methods used in this study, although different, leads to the same conclusions. Combination treatments also indicated, for the first time, that BC-7 and A. afra have the ability to function in a synergic manner with cisplatin and proves that, although extensive research may have been done on a plant or compound, more can be discovered. This new information can lead to identification of new compounds in the plants and the integration of signalling pathways that can be targeted for treatment of cancer.]]> Fri 15 Mar 2024 11:56:53 SAST ]]>