https://commons.ru.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Beyond mastery: jazz, gender and power in postapartheid South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:72876 Wed 29 Jan 2025 16:31:37 SAST ]]> A strategy towards an it governance-focused implementation of Egovernment initiatives in the Eastern Cape provincial government https://commons.ru.ac.za/vital/access/manager/Repository/vital:77085 Wed 29 Jan 2025 15:42:09 SAST ]]> A strategy for cybersecurity vulnerability management in the South African retail sector https://commons.ru.ac.za/vital/access/manager/Repository/vital:77084 Wed 29 Jan 2025 15:21:14 SAST ]]> Causative factors for poor contractor performance in schools infrastructure projects https://commons.ru.ac.za/vital/access/manager/Repository/vital:77083 Wed 29 Jan 2025 14:32:12 SAST ]]> Ammendments to the labour law relations act 66 of 1995 to addressing violent and intractable strikes https://commons.ru.ac.za/vital/access/manager/Repository/vital:77082 Wed 29 Jan 2025 11:30:05 SAST ]]> The legality of euthanasia conducted by medical practitioners https://commons.ru.ac.za/vital/access/manager/Repository/vital:77081 Wed 29 Jan 2025 11:02:14 SAST ]]> The review of a disciplinary finding or sanction in terms of section 158(1)(h) of the labour relations act 66 of 1995 https://commons.ru.ac.za/vital/access/manager/Repository/vital:77080 Wed 29 Jan 2025 10:55:08 SAST ]]> Climate responsive innovation within the agricultural curriculum and learning system https://commons.ru.ac.za/vital/access/manager/Repository/vital:68479 Wed 29 Jan 2025 10:20:31 SAST ]]> Managing releases of Anagyrus vladimiri (Triapitsyn) to augment biocontrol of the citrus mealybug Planococcus citri (Risso) in South African citrus orchards https://commons.ru.ac.za/vital/access/manager/Repository/vital:73118 Wed 12 Feb 2025 18:50:49 SAST ]]> An assessment of the status of psylloid species (Hemiptera: Psylloidea) as potential pests of commercial citrus in southern Africa: implications for pest management https://commons.ru.ac.za/vital/access/manager/Repository/vital:76509 Wed 12 Feb 2025 18:43:41 SAST ]]> Co-crystal formation of pharmaceutical and veterinary tranquilizer molecules https://commons.ru.ac.za/vital/access/manager/Repository/vital:76519 Wed 12 Feb 2025 18:29:42 SAST ]]> The sustainability impacts and opportunities of reverse osmosis (RO) plants on the quadruple bottom line perspective: a case of the Eastern Cape Province, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:76250 Wed 12 Feb 2025 18:15:48 SAST ]]> Exploring a new model for science engagement through documentary video production https://commons.ru.ac.za/vital/access/manager/Repository/vital:76666 Wed 12 Feb 2025 17:54:51 SAST ]]> A descriptive study of lead arm muscle activation patterns during cricket batting https://commons.ru.ac.za/vital/access/manager/Repository/vital:76542 Wed 12 Feb 2025 17:33:52 SAST ]]> Suspicious activity reports: Enhancing the detection of terrorist financing and suspicious transactions in migrant remittances https://commons.ru.ac.za/vital/access/manager/Repository/vital:76569 Wed 12 Feb 2025 17:17:33 SAST ]]> An exploratory study of the benefits of reading clubs for learners in English First Additional Language classrooms https://commons.ru.ac.za/vital/access/manager/Repository/vital:76435 Wed 12 Feb 2025 17:12:41 SAST ]]> Comparative analysis of YOLOV5 and YOLOV8 for automated fish detection and classification in underwater environments https://commons.ru.ac.za/vital/access/manager/Repository/vital:76502 Wed 12 Feb 2025 15:20:44 SAST ]]> Multiple drivers of local (non-) compliance in community-based marine resource management: Case studies from the South Pacific https://commons.ru.ac.za/vital/access/manager/Repository/vital:71744 Wed 12 Feb 2025 13:29:00 SAST ]]> Social innovation that connects people to coasts in the Anthropocene https://commons.ru.ac.za/vital/access/manager/Repository/vital:68649 Wed 12 Feb 2025 13:29:00 SAST ]]> Detecting change in local ecological knowledge: An application of an index of taxonomic distinctness to an ethnoichthyological classification in the Solomon Islands https://commons.ru.ac.za/vital/access/manager/Repository/vital:70282 Wed 12 Feb 2025 13:28:49 SAST ]]> Comparison of fluorophore and peroxidase labeled aptamer assays for MUC1 detection in cancer cells https://commons.ru.ac.za/vital/access/manager/Repository/vital:72742 Wed 12 Feb 2025 13:28:49 SAST ]]> Forced degradation studies of clobetasol 17‐propionate in methanol, propylene glycol, as bulk drug and cream formulations by RP‐HPLC https://commons.ru.ac.za/vital/access/manager/Repository/vital:44154 Wed 12 Feb 2025 13:21:55 SAST ]]> Firm age, collateral value, and access to debt financing in an emerging economy: evidence from South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:69147 Wed 12 Feb 2025 12:25:35 SAST ]]> Teachers’ use of authentic tasks through mathematics trails in a mobile learning environment to facilitate conceptual teaching https://commons.ru.ac.za/vital/access/manager/Repository/vital:76727 Wed 05 Feb 2025 18:15:43 SAST ]]> Issues in language acquisition planning in Zimbabwe: the case of Ndebele within the primary education system https://commons.ru.ac.za/vital/access/manager/Repository/vital:73091 Wed 05 Feb 2025 17:40:55 SAST ]]> Co-creating a pedagogy of care for our hydrocommons in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:76726 Wed 05 Feb 2025 17:19:51 SAST ]]> The ontological reality of spirit and its ways of knowing as a form of embodied intangible cultural heritage: a case of the oGobela teaching approaches and techniques within Ubungoma practice https://commons.ru.ac.za/vital/access/manager/Repository/vital:76421 Wed 05 Feb 2025 16:02:52 SAST ]]> Synthesis, X-Ray characterization, spectroscopic and Hirshfeld surface analysis of dimeric metal centers featuring phenacyl-esters https://commons.ru.ac.za/vital/access/manager/Repository/vital:77254 Wed 05 Feb 2025 15:27:44 SAST ]]> Ground- and marine water inputs into supratidal microbialite systems along the Nelson Mandela Bay coastline https://commons.ru.ac.za/vital/access/manager/Repository/vital:77253 Wed 05 Feb 2025 14:18:01 SAST ]]> Graphene@microalgae-based nanohybrid structures as adsorbents for removal of Cr(VI) ions in aqueous solutions https://commons.ru.ac.za/vital/access/manager/Repository/vital:77252 0.995) suggesting that chemisorption governed the adsorption process. Similarly, the isotherm adsorption findings showed a good fit with the Freundlich model (R2 > 0.961). The findings indicated that the adsorption mechanism process was characterised by monolayer adsorption onto a heterogeneous adsorbent surface. Furthermore, the GO@Algae (1:3) was found to have the maximum adsorption capacity of 10.85 mg/g surpassing the capacities of both unmodified and NGO@Algae counterparts. The application of GO@Algae and NGO@Algae has the potential to promote the green reuse of graphene-based nanomaterials. In summary, GO@Algae and NGO@Algae show great potential as eco-friendly adsorbents for the feasible treatment of heavy metal-contaminated water.]]> Wed 05 Feb 2025 13:28:45 SAST ]]> A multistep synthesis of zidovudine in continuous flow systems https://commons.ru.ac.za/vital/access/manager/Repository/vital:77251 Wed 05 Feb 2025 11:57:48 SAST ]]> Associations between patterns of wild ungulate patch use, soil carbon and albedo in montane grasslands https://commons.ru.ac.za/vital/access/manager/Repository/vital:77250 Wed 05 Feb 2025 11:22:44 SAST ]]> Chiral Modulation from Molecular to Macroscopic levels by synthetic chiral-amide-bonded porphyrin dimers https://commons.ru.ac.za/vital/access/manager/Repository/vital:44535 Wed 05 Feb 2025 10:54:55 SAST ]]> Photophysicochemical behaviour of phenoxy propanoic acid functionalised zinc phthalocyanines when grafted onto iron oxide and silica nanoparticles: Effects in photodynamic antimicrobial chemotherapy https://commons.ru.ac.za/vital/access/manager/Repository/vital:44389 Wed 05 Feb 2025 10:54:54 SAST ]]> Light-driven antimicrobial therapy of palladium porphyrins and their chitosan immobilization derivatives and their photophysical-chemical properties https://commons.ru.ac.za/vital/access/manager/Repository/vital:57894 Wed 05 Feb 2025 10:54:53 SAST ]]> Turn-on detection of cysteine by a donor-acceptor type quinoline fluorophore: Exploring the sensing strategy and performance in bioimaging https://commons.ru.ac.za/vital/access/manager/Repository/vital:44406 Wed 05 Feb 2025 10:54:53 SAST ]]> Core-modified rubyrins with phenanthrene-fused pyrrole rings https://commons.ru.ac.za/vital/access/manager/Repository/vital:50209 Wed 05 Feb 2025 10:54:51 SAST ]]> “Ha! Relationships? I only shout at them!”: Strategic management of discordant rapport in an African small business context https://commons.ru.ac.za/vital/access/manager/Repository/vital:68009 Wed 05 Feb 2025 07:32:15 SAST ]]> The processes and problems involved in winding up a deceased estate in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:76415 Tue 11 Feb 2025 19:10:56 SAST ]]> Protecting stateless children in South Africa through nationality: a children’s rights approach https://commons.ru.ac.za/vital/access/manager/Repository/vital:76733 Tue 11 Feb 2025 18:49:59 SAST ]]> The integration of sustainability in municipalities in South Africa: an evaluation of an Eastern Cape district municipality’s water supply distribution systems https://commons.ru.ac.za/vital/access/manager/Repository/vital:76248 Tue 11 Feb 2025 18:42:57 SAST ]]> Elucidation of the roles of the carbonic anhydrase enzymes, CanA & CanB, in the physiology of Mycobacterium smegmatis https://commons.ru.ac.za/vital/access/manager/Repository/vital:73145 Tue 04 Feb 2025 16:01:52 SAST ]]> An exploration of the influence of gender dynamics on the experience of NGO staff members in Makhanda https://commons.ru.ac.za/vital/access/manager/Repository/vital:76700 Tue 04 Feb 2025 15:54:53 SAST ]]> Supramolecular chemistry considerations of fluorenyl-derived host compounds https://commons.ru.ac.za/vital/access/manager/Repository/vital:77227 91% DMA), while the experiment with all three anilines present also resulted in a complex with an]]> Tue 04 Feb 2025 11:35:57 SAST ]]> Toughened wood plastic composites for low technology and advanced manufacturing applications https://commons.ru.ac.za/vital/access/manager/Repository/vital:77225 Tue 04 Feb 2025 11:15:02 SAST ]]> Low-income area electrification systems https://commons.ru.ac.za/vital/access/manager/Repository/vital:77115 Thu 30 Jan 2025 15:55:10 SAST ]]> Quantifying feed intake and feeding intensity using two experimental conditions and the effect of different feeding strategies on the production parameters of farmed South African abalone, haliotis midae https://commons.ru.ac.za/vital/access/manager/Repository/vital:71932 Thu 30 Jan 2025 15:55:10 SAST ]]> Construction material waste control success model for the construction industry https://commons.ru.ac.za/vital/access/manager/Repository/vital:77114 Thu 30 Jan 2025 15:34:02 SAST ]]> Factors that influence the adoption and implementation of sustainable procurement: a case of a South African public university https://commons.ru.ac.za/vital/access/manager/Repository/vital:73094 Thu 13 Feb 2025 18:50:00 SAST ]]> High-altitude temporary systems and macroinvertebrate composition in La Nina cycle, Maloti-Drakensberg https://commons.ru.ac.za/vital/access/manager/Repository/vital:73119 Thu 13 Feb 2025 18:28:58 SAST ]]> The reading to learn pedagogy in South African inclusive English First Additional Language classrooms: successes and challenges https://commons.ru.ac.za/vital/access/manager/Repository/vital:76436 Thu 13 Feb 2025 18:15:04 SAST ]]> The Zimbabwe National Gender Policy (NGP) 2013–2017 and Women’s Economic Empowerment (WEE): a study of small-scale gold miners in the Bubi and Gwanda rural districts, Zimbabwe https://commons.ru.ac.za/vital/access/manager/Repository/vital:73092 Thu 13 Feb 2025 18:01:07 SAST ]]> Medical pluralism amongst Makhanda traditional health practitioners: Exploring dispositions to COVID-19 vaccinations https://commons.ru.ac.za/vital/access/manager/Repository/vital:76714 Thu 13 Feb 2025 17:47:02 SAST ]]> Perceptions, knowledge, and attitudes towards employee wellness programmes among private high school educators in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:76543 Thu 13 Feb 2025 17:18:56 SAST ]]> Artificial Intelligence (AI) and blockchain technologies in advancing sustainable healthcare development in Kenya: a critique of dependency theory https://commons.ru.ac.za/vital/access/manager/Repository/vital:76677 Thu 13 Feb 2025 17:05:05 SAST ]]> Insights: elucidation of squalene monooxygenase inhibitors for lowering cholesterol in cardiovascular diseases https://commons.ru.ac.za/vital/access/manager/Repository/vital:73111 Thu 13 Feb 2025 16:02:12 SAST ]]> The acceptability of Prolonged Exposure Therapy for Primary Care (PE-PC) for the treatment of PTSD in a low resourced community in the Eastern Cape https://commons.ru.ac.za/vital/access/manager/Repository/vital:76706 Thu 13 Feb 2025 15:48:02 SAST ]]> Modelling water quality dynamics by integrating PYWR, climate change, and land-cover scenarios: a case study in the Grootdraai Dam Catchment, Upper Vaal, South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:76564 Thu 13 Feb 2025 15:41:01 SAST ]]> Exploring expansive learning and co-management in the uMzimvumbu catchment https://commons.ru.ac.za/vital/access/manager/Repository/vital:73281 Thu 13 Feb 2025 09:50:58 SAST ]]> The effectiveness of the land redistribution programme on women’s quality of life: a case study of Buffalo City Municipality, Eastern Cape https://commons.ru.ac.za/vital/access/manager/Repository/vital:46393 Thu 06 Feb 2025 15:41:44 SAST ]]> The influence of strategic leadership on the performance of small and medium-sized enterprises as mediated by strategy implementation https://commons.ru.ac.za/vital/access/manager/Repository/vital:73099 Thu 06 Feb 2025 14:59:26 SAST ]]> The inhibitory effects of cannabinoids from cannabis sativa on the enzymes dipeptidyl peptidase-IV, sucrase and maltase as a new therapeutic treatment for type 2 diabetes https://commons.ru.ac.za/vital/access/manager/Repository/vital:77264 Thu 06 Feb 2025 14:17:35 SAST ]]> Main thesis title: subtitle if needed. If no subtitle follow instructions in manual https://commons.ru.ac.za/vital/access/manager/Repository/vital:77261 Thu 06 Feb 2025 13:49:55 SAST ]]> Screening drug candidates for sars-cov-2 spike protein variants within the SANCDB (South African Natural Compounds Database) and drug bank https://commons.ru.ac.za/vital/access/manager/Repository/vital:77263 Thu 06 Feb 2025 13:49:52 SAST ]]> Studies on soil acidity management strategies for sustainable agriculture https://commons.ru.ac.za/vital/access/manager/Repository/vital:77260 0.05) for any of the tested soil nutrient availability and soil acidity parameters, except for pHw. However, lime rate effects were significant (p<0.05) on AS, EA, pH(KCl) and ext Al. As lime rate increased, the acidity decreased. Increasing the lime application rate significantly (p<0.05) enhanced the cation exchange capacity (CEC), calcium (Ca), magnesium (Mg) and phosphorous (P), but decreased potassium (K) and sulphur (S). The availability of micro-nutrients namely copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) also decreased as the lime rate increased. Biochar effects on EA, AS, pH(KCl) and ext Al were not significant (p>0.05). However, the biochar significantly reduced the availability of Ca and Mn but did not have a significant effecton all the other nutrients at the tested application rates. Unenriched biochar at 10 t ha-1 had an acidifying effect on the soil as it increased EA, when compared to enriched biochar. The significant (p <0.05) biochar × lime × time interaction effect on pHw showed that biochar applied without lime increased pHw, and the benefits were greatest at 10 t ha-1 biochar application rate. Similarly, lime applied without biochar also had a significant positive effect on pHw and the benefit increased at higher lime application rates. After 60 days of incubation, the lime applied at the highest rate of 5 t ha-1 without biochar (0 t ha-1 biochar) had the highest final pHw value. The 3-way interaction of lime, biochar and genotype was not significant (p>0.05). Koonap, the acid tolerant wheat variety outperformed the sensitive variety, Gariep under all treatments in the acid soil, as expected. There was, however, a significant (p<0.05) lime rate × biochar interaction. The highest application rates of lime (5 t ha-1) and biochar (10 t ha-1) were the best combination for root length for both the varieties. Overall, these results suggested a possible buffering effect of biochar at low lime application rates, thus limited benefits of combining reduced lime doses with biochar on reducing soil acidity or enhancing nutrient availability. The null hypothesis was thus rejected, and it was concluded that co-application of reduced lime rates and biochar will not significantly enhance benefits of liming. However, a positive interaction from co-application of biochar and lime on both pH and plant growth is possible at high application rates of both biochar and lime.]]> Thu 06 Feb 2025 13:00:24 SAST ]]> Exploiting continuous flow technology to develop synthetic processes for active pharmaceutical ingredients: prilocaine and betrixaban https://commons.ru.ac.za/vital/access/manager/Repository/vital:77259 Thu 06 Feb 2025 11:43:37 SAST ]]> Synthesis of two tartaric acid-derived host compounds and their behaviour in mixed pyridines and mixed heterocyclic guest compounds https://commons.ru.ac.za/vital/access/manager/Repository/vital:77256 3MP > 4MP > 2MP. The behaviour of TADDOL5 was further investigated in guest compounds DIO, PYR, PIP and MOR. Each guest solvent formed 1:1 H:G inclusion complexes with the host species, with the exception of DIO, which formed a 2:1 H:G complex. Mixed guest experiments revealed a clear preference for PIP and MOR, while PYR and DIO were less favoured. The host selectivity was demonstrated to be in the order PIP > MOR > PYR > DIO. SCXRD experiments showed that TADDOL5 formed a much shorter (and more linear) (host)O‒H···N(guest) hydrogen bond with the most favoured guest, PIP, compared to those involving MOR and PYR. A (host)O‒H···O(guest) hydrogen bond was also observed in the DIO-containing inclusion complex. A consideration of the Hirshfeld surface interactions was not useful in explaining the host selectivity order for these heterocyclic guests, but thermal analyses confirmed that the most stable complex was the one with favoured PIP, followed by those with PYR, MOR and DIO. TADDOL6, on the other hand, formed 1:1 H:G inclusion compounds with all four of the heterocyclic guest solvents. Experiments in mixed guests showed that the selectivity of this host compound for these guests was in the order PYR > PIP > MOR > DIO, which differed from the TADDOL5 (which favoured PIP and then MOR). Interestingly, the strongest classical hydrogen bond was not formed with the most favoured guest PYR, but with PIP instead (this bond with TADDOL5 was also strongest with PIP, but PIP was favoured in that work). Hirshfeld surface investigations again were not useful in understanding the host selectivity behaviour. However, thermal analyses agreed with the observations made in the mixed guest experiments: the most stable complex was with PYR (favoured) and the least stable one was with DIO (least preferred).]]> Thu 06 Feb 2025 09:09:24 SAST ]]> Gold mineralization at the Blue Rock Deposit, Gadzema Greenstone Belt: Implications on genesis and exploration for orogenic gold mineralization within Archaean Greenstone Belts of Zimbabwe https://commons.ru.ac.za/vital/access/manager/Repository/vital:76559 Sun 09 Feb 2025 18:01:13 SAST ]]> Extreme value theory with applications in finance https://commons.ru.ac.za/vital/access/manager/Repository/vital:76568 Sun 09 Feb 2025 17:54:34 SAST ]]> Cocrystals, salts and eutectics of anti-tuberculosis medicines https://commons.ru.ac.za/vital/access/manager/Repository/vital:76518 Sun 09 Feb 2025 17:33:29 SAST ]]> Teaching problem solving: the "Ten Commandments" approach https://commons.ru.ac.za/vital/access/manager/Repository/vital:76555 Sun 09 Feb 2025 16:58:12 SAST ]]> Church music as pedagogy: An investigation through digital storytelling into the role that Southern African Christian Church music praxis played in the musical development of five professional musicians https://commons.ru.ac.za/vital/access/manager/Repository/vital:76673 Sun 09 Feb 2025 15:34:18 SAST ]]> Interlingual and intercultural communication discordances as impediments to the provision of quality public healthcare services: cases of Cecilia Makiwane Hospital, Nkqubela Chest Hospital and Frere Hospital https://commons.ru.ac.za/vital/access/manager/Repository/vital:73163 Sun 02 Feb 2025 13:35:06 SAST ]]> Eastern Cape jazz heritage: the jazz tradition and veteran musicians of East London and Zwelitsha https://commons.ru.ac.za/vital/access/manager/Repository/vital:76672 Sun 02 Feb 2025 13:21:06 SAST ]]> No way to escape: a crime fiction https://commons.ru.ac.za/vital/access/manager/Repository/vital:76668 Sun 02 Feb 2025 13:07:04 SAST ]]> “What’s good fam?”: African digital sociality and notions of community and family in the UCKAR Facebook group https://commons.ru.ac.za/vital/access/manager/Repository/vital:76665 Sun 02 Feb 2025 13:00:15 SAST ]]> Music in everyday life: an exploration into the various uses of music among restaurant servers in Makhanda https://commons.ru.ac.za/vital/access/manager/Repository/vital:76702 Sun 02 Feb 2025 12:11:07 SAST ]]> “But we are shying all of us away, from that thing”: the Coronavirus Pandemic and the crisis of teenage pregnancies in Kenya https://commons.ru.ac.za/vital/access/manager/Repository/vital:76674 Mon 10 Feb 2025 15:41:23 SAST ]]> The impact of Malawi’s National Strategy on Inclusive Education: a case study analysis of two schools https://commons.ru.ac.za/vital/access/manager/Repository/vital:73277 Mon 10 Feb 2025 14:45:13 SAST ]]> An Investigation of the variability of oceanic turbulence in the Agulhas Current: focus on the Durban Eddies and Natal Pulses https://commons.ru.ac.za/vital/access/manager/Repository/vital:77276 Mon 10 Feb 2025 14:17:11 SAST ]]> Exploring grade 11 learners’ mathematical problem-solving skills using Polka’s model during the learning of Euclidean geometry https://commons.ru.ac.za/vital/access/manager/Repository/vital:73274 Mon 03 Feb 2025 16:03:03 SAST ]]> Marine plastic pollution impacts on ecosystem services and livelihoods in South Africa: a review and stakeholder perceptions https://commons.ru.ac.za/vital/access/manager/Repository/vital:72180 Mon 03 Feb 2025 15:42:07 SAST ]]> Native-range studies on insect herbivores associated with African Lovegrass (Eragrostis curvula) in South Africa: prospects for biological control in Australia https://commons.ru.ac.za/vital/access/manager/Repository/vital:72154 Mon 03 Feb 2025 15:28:06 SAST ]]> A framework for designing a gamified system that promotes knowledge of water sustainability https://commons.ru.ac.za/vital/access/manager/Repository/vital:77216 Mon 03 Feb 2025 15:07:11 SAST ]]> Formulation of Fish Feed for Aquaculture using Olive Pomace Extract as an Antioxidant https://commons.ru.ac.za/vital/access/manager/Repository/vital:77205 Mon 03 Feb 2025 11:30:10 SAST ]]> Collaborative conservation governance in multifunctional landscapes: a contextual analysis of two South African biosphere reserves in the Boland https://commons.ru.ac.za/vital/access/manager/Repository/vital:77164 Fri 31 Jan 2025 14:59:09 SAST ]]> With dreams in our hands: Towards transgressive knowledge-making cultures https://commons.ru.ac.za/vital/access/manager/Repository/vital:69909 Fri 31 Jan 2025 14:41:27 SAST ]]> Development of density-dependent and density-independent competition models to understand single tree growth responses in eucalyptus stands https://commons.ru.ac.za/vital/access/manager/Repository/vital:77161 Fri 31 Jan 2025 14:03:11 SAST ]]> Comparative study of the effect of iloprost on neuroinflammatory changes in c8-b4 microglial cells and murine model of trypanosomiasis https://commons.ru.ac.za/vital/access/manager/Repository/vital:77160 Fri 31 Jan 2025 13:42:19 SAST ]]> Social dynamics of spotted hyaenas (Crocuta crocuta) in fenced protected areas: Implications for conservation management of a socially intelligent species https://commons.ru.ac.za/vital/access/manager/Repository/vital:77159 Fri 31 Jan 2025 13:35:19 SAST ]]> Portfolio effect and bet-hedging adaptations in sea turtles https://commons.ru.ac.za/vital/access/manager/Repository/vital:77153 Fri 31 Jan 2025 13:07:28 SAST ]]> The optimisation of Eucalyptus regeneration practices for improved survival, growth and uniformity in South African pulpwood plantations https://commons.ru.ac.za/vital/access/manager/Repository/vital:77135 90%) is important in terms of optimising rotation-end yield. The industry origin of a 90% survival benchmark is unclear, although company procedures incorporate this as the minimum threshold in terms of re-establishment success. Past research indicates that most mortality occurs within a narrow period post-establishment and is often associated with substandard re-establishment practices and/or a stressed micro-environment. An improved understanding is needed about the various mitigation measures needed to minimize mortality during eucalypt re-establishment. Before making decisions related to mortality mitigation measures, comprehensive data are required as to their commercial applicability as well as outcomes from multiple trials that accurately quantify any impacts on tree survival and financial return. The overall purpose of this dissertation was the optimisation of Eucalyptus re-establishment practices for improved survival, growth and uniformity in South African pulpwood plantations. To achieve this, five inter-linked objectives were determined. The first objective was to highlight the most important factors contributing to increased mortality in eucalypt plantations during re-establishment. This was achieved through conducting a literature review. Citations were ranked in terms of credibility, with the importance ratings (derived from the literature sources) applied to the different factors affecting survival and growth during eucalypt re-establishment. Of the various factors impacting early eucalypt mortality, water stress and planting stock quality were considered highly important. The manner and quality of site preparation (soil and slash), planting practices (planting depth included), timing of planting (during dry, hot periods), various post-planting operations (incorrect fertiliser placement or herbicide drift) and insect pests and diseases also contribute to mortality, but to a lesser extent. These factors cannot be considered in isolation due to the complex interactions that exist between them and determining the primary causes of mortality can be elusive, especially as their impacts tend to be additive by nature. The second objective was to link survival to silvicultural treatments, site-related physiographic factors and climatic variables in South Africa. This was achieved by conducting an integrated analysis of 43 Eucalyptus trials. Of the seven re-establishment practices considered, watering, planting depth and fertiliser application were significant, with plant size, pitting method, residue management and insecticide application were not significant. However, when environmental variables were included within the analyses, there were significant site x treatment interactions for planting depth, plant size, residue management and fertiliser application. This highlights the importance of taking site related factors into consideration when interpreting the causes of mortality. The third objective was to determine the interaction between planting density and mortality on Eucalyptus growth, uniformity and financial yield at rotation end in South Africa. This was carried out to verify whether planting at different densities may be used as a preventative (before planting) mitigation measure. One trial was used to answer four keys sub-objectives: 1) The impact of three planting densities (1 102, 1 500, 1 959 SPH) with no mortality on yield at rotation-end; 2) The impact of mortality (0%, 10%, 20%, 30%, 40%) on rotation-end yield; 3) The quantification of tree performance when planting at a higher density and accepting a certain degree of mortality; and 4) The financial impact of different planting densities and mortality on rotation-end profit. Higher planting densities resulted in smaller individual trees, but with an increase in stand level performance. At rotation-end, lower mortality (0% and 10%) had significantly higher volumes ha-1 than the higher mortality (30% and 40%). Planting at higher densities (1 722 and 1 959 SPH) and accepting a certain degree of mortality resulted in non-significant differences for volume at rotation-end compared to the fully stocked 1 500 SPH treatment. A higher SPH resulted in a higher yield, but with an increase in estimated establishment/tending and harvesting costs. In contrast, an increase in mortality and/or lower SPH (in the absence of mortality) resulted in more variable stand growth, together with an increase in estimated machine harvesting productivity and reduced costs. Irrespective of SPH, the higher the mortality the greater the loss of income, with the best profit within each treatment related to full stocking (0% mortality). Within the higher panting densities, the profit gained following low mortality (10 and 20%) was similar to that of no mortality (0%), indicating that higher mortality may be tolerated when planting at higher densities, confirming the 90% survival threshold the industry aims to achieve post-establishment. The fourth objective was to determine if silviculture intervention (blanking at 1, 2 and 3 months or coppicing and interplanting at 6 months) will result in acceptable eucalypt stocking, if mortality is higher than 10% (remedial mitigation measure). Data from a re-establishment trial were analysed to determine which of the mitigation measures performed best in terms of stocking and growth. Coppicing and interplanting with larger plants was not a viable option as a mitigation measure for mortality as most of the coppice shoots have died. This may have been a result of frost. Although high re-establishment costs may be incurred, disaster clearing to waste followed by replanting is an option if mortality is unacceptably high (as opposed to leaving the stand as is). The results of this objective confirm that blanking as the current Best Operating Practice is still appropriate in South African forestry (i.e., try to have survival >90% and blank as soon as possible to retain >90% of stems). Blanked plants do contribute to volume, but for this to occur, blanking should be carried out within 4 weeks after planting to gain maximum benefit. In addition, it highlights the importance of implementing remedial mitigation measures to achieve >90% survival so as to gain maximum benefit. Using the outcomes from objectives 1-4, the fifth objective focussed on the development of a decision support system (DSS) for implementation of mitigation measures to improve survival within commercial eucalypt pulpwood plantations in South Africa. Improved survival starts with the implementation of good re-establishment practices and good quality planting stock. Mitigation measures for poor survival can be implemented either prior to re-establishment (before mortality occurs) or post re-establishment (after mortality has occurred). If poor survival still occurs after the implementation of good silviculture practices and pre-re-establishment mitigation practices (planting at higher densities), one should consider the various options available in terms of post re-establishment mitigation practices (remedial practices) such as blanking or replanting if mortality is high. Overall, the outcomes from this dissertation provide benchmark data and derived information as to the necessity for various mortality mitigation options within the commercial forestry sector in South Africa. In addition, the DSS will assist with decision making in terms of implementing the best silviculture practices and mitigation measures for improved survival during eucalypt re-establishment in South African pulpwood plantations.]]> Fri 31 Jan 2025 12:04:12 SAST ]]> Investigation of potential in-situ polymerization reactions for use in lithium-ion batteries https://commons.ru.ac.za/vital/access/manager/Repository/vital:77127 Fri 31 Jan 2025 11:43:38 SAST ]]> Gymnopilus junonius and Rhodofomitopsis lilacinogilva: In vitro evaluation of antimycobacterial activity, safety assessment and isolation of active compounds https://commons.ru.ac.za/vital/access/manager/Repository/vital:77122 Fri 31 Jan 2025 11:07:58 SAST ]]> Solution of some cross-diffusion equations in biosciences using finite difference methods and artificial neural networks https://commons.ru.ac.za/vital/access/manager/Repository/vital:77121 Fri 31 Jan 2025 10:25:54 SAST ]]> Characterization of the molecular mechanism(s) of cannabinoid-induced paraptosis in breast cancer cells https://commons.ru.ac.za/vital/access/manager/Repository/vital:77120 Fri 31 Jan 2025 09:50:54 SAST ]]> A Note on the (Continued) Ability of the Yield Curve to Forecast Economic Downturns in South Africa https://commons.ru.ac.za/vital/access/manager/Repository/vital:69142 Fri 14 Feb 2025 08:55:31 SAST ]]> The impact of corruption on stock market performance : evidence from BRICS https://commons.ru.ac.za/vital/access/manager/Repository/vital:76329 Fri 07 Feb 2025 15:48:55 SAST ]]> An investigation into the impact of geographical location on the phytochemical composition, pharmacological and toxicological activities of Tulbaghia violacea collected from the Eastern Cape and Gauteng Province https://commons.ru.ac.za/vital/access/manager/Repository/vital:76242 Fri 07 Feb 2025 15:27:49 SAST ]]> Potential futures: land management decision making in the Albertinia-Herbertsdale area of the Gouritz Cluster Biosphere Reserve https://commons.ru.ac.za/vital/access/manager/Repository/vital:76548 Fri 07 Feb 2025 15:21:07 SAST ]]>