Drug Resistance in the HIV-1 Subtype C Protease Enzyme: A High Throughput Virtual Screening Approach in Search of New Ligands with Activity
- Sarron, Arthur F D, Lobb, Kevin A
- Authors: Sarron, Arthur F D , Lobb, Kevin A
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452699 , vital:75163 , xlink:href="10.2174/1871520622666220202161543"
- Description: Background: HIV-1 subtype C protease is a strategic target for antiretroviral treatment. However, resistance to protease inhibi-tors appears after months of treatment. Chromones and 2- bis-coumarin derivatives show potential for inhibition of the HIV- subtype C protease. Objective: Different heterocyclic structures from the ZINC database were docked against Human Immuno-deficiency Virus-1 (HIV) subtype C protease crystal structure 2R5Q and 2R5P. The 5 best molecules were selected to be docked against 62 homology models based on HIV-protease se-quences from infants failing antiretroviral protease treatment. This experimentation was performed with two molecular docking programs: Autodock and Autodock Vina. These molecules were modified by substituting protons with different moieties, and the derivatives were docked against the same targets. Ligand-protein interactions, physical/chemical proprieties of the mole-cules, and dynamics simulations were analyzed.
- Full Text:
- Authors: Sarron, Arthur F D , Lobb, Kevin A
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452699 , vital:75163 , xlink:href="10.2174/1871520622666220202161543"
- Description: Background: HIV-1 subtype C protease is a strategic target for antiretroviral treatment. However, resistance to protease inhibi-tors appears after months of treatment. Chromones and 2- bis-coumarin derivatives show potential for inhibition of the HIV- subtype C protease. Objective: Different heterocyclic structures from the ZINC database were docked against Human Immuno-deficiency Virus-1 (HIV) subtype C protease crystal structure 2R5Q and 2R5P. The 5 best molecules were selected to be docked against 62 homology models based on HIV-protease se-quences from infants failing antiretroviral protease treatment. This experimentation was performed with two molecular docking programs: Autodock and Autodock Vina. These molecules were modified by substituting protons with different moieties, and the derivatives were docked against the same targets. Ligand-protein interactions, physical/chemical proprieties of the mole-cules, and dynamics simulations were analyzed.
- Full Text:
Ecosystem for 4th industrial revolution to accelerate sustainable development goals in the South Africa’,‘n context: a conceptual framework
- Diale, Dineo, Kanakana-Katumba, Mukondeleli G, Maladzhi, Rendani W, von der Ohe, Hartmut
- Authors: Diale, Dineo , Kanakana-Katumba, Mukondeleli G , Maladzhi, Rendani W , von der Ohe, Hartmut
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/450592 , vital:74963 , xlink:href="https://ieomsociety.org/proceedings/2022nigeria/11.pdf"
- Description: Contextualizing technology and digitalization in a period of having to meet sustainable development goals (SDGs), requires a paradigm shift which calls for collaboration from multiple stakeholders. The current turbulent environment requires an investigation into ways of adopting the Fourth Industrial Revolution (4IR) as a pertinent mechanism for accelerating sustainable development goals. The need to formulate a conceptual framework and adapt it to the South African context, requires careful mapping of the elements of 4IR, the relevant infrastructure and resources There has been perceptions instigating resistance towards the SDGs, hence the need to develop the conceptual framework. The exploratory research method fitted well as its nature a systematic review to effect and respond to the abovementioned investigation. The study reviewed about 70 articles of which 53 of those were peerreviewed articles within 4th industrial revolution in South Africa as set for ecosystem. Due to limited research on the topic, possible impacting variables that added immeasurable value were explored as contributing factors the study. Both reviewed literature and government archive on 4th industrial revolution revealed how the ecosystems of 4IR accelerated the achievement of SDGs in South Africa. The study further singled smart factories, smart cities, integrated systems, green technologies, cybernetics, the internet of people, the internet of energy, and the internet of things as contributing factors towards 4IR. The recommended the applicability of the ecosystems onto the South African context to advance innovation agenda to achieve green energy, sustainable water provision, waste management, trade in low-carbon products, cleaner and greener technologies, green buildings, green chemistry and sustainable transport, as well as improved air quality.
- Full Text:
- Authors: Diale, Dineo , Kanakana-Katumba, Mukondeleli G , Maladzhi, Rendani W , von der Ohe, Hartmut
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/450592 , vital:74963 , xlink:href="https://ieomsociety.org/proceedings/2022nigeria/11.pdf"
- Description: Contextualizing technology and digitalization in a period of having to meet sustainable development goals (SDGs), requires a paradigm shift which calls for collaboration from multiple stakeholders. The current turbulent environment requires an investigation into ways of adopting the Fourth Industrial Revolution (4IR) as a pertinent mechanism for accelerating sustainable development goals. The need to formulate a conceptual framework and adapt it to the South African context, requires careful mapping of the elements of 4IR, the relevant infrastructure and resources There has been perceptions instigating resistance towards the SDGs, hence the need to develop the conceptual framework. The exploratory research method fitted well as its nature a systematic review to effect and respond to the abovementioned investigation. The study reviewed about 70 articles of which 53 of those were peerreviewed articles within 4th industrial revolution in South Africa as set for ecosystem. Due to limited research on the topic, possible impacting variables that added immeasurable value were explored as contributing factors the study. Both reviewed literature and government archive on 4th industrial revolution revealed how the ecosystems of 4IR accelerated the achievement of SDGs in South Africa. The study further singled smart factories, smart cities, integrated systems, green technologies, cybernetics, the internet of people, the internet of energy, and the internet of things as contributing factors towards 4IR. The recommended the applicability of the ecosystems onto the South African context to advance innovation agenda to achieve green energy, sustainable water provision, waste management, trade in low-carbon products, cleaner and greener technologies, green buildings, green chemistry and sustainable transport, as well as improved air quality.
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Effets de la pandémie de COVID-19 et du travail de soins non rémunéré sur les moyens d'existence des travailleurs informels
- Ogando, Ana C, Rogan, Michael, Moussié, Rachel
- Authors: Ogando, Ana C , Rogan, Michael , Moussié, Rachel
- Date: 2022
- Subjects: To be catalogued
- Language: French
- Type: text , article
- Identifier: http://hdl.handle.net/10962/473894 , vital:77691 , https://doi.org/10.1111/ilrf.12239
- Description: Avec la pandémie de COVID‐19, la crise sanitaire et économique s'est doublée d'une crise du travail de soins. Tous les travailleurs en ont pâti, y compris dans l'économie informelle. Les auteurs exploitent les résultats d'une étude longitudinale menée par le réseau WIEGO en juin‐juillet 2020 auprès de travailleurs informels de douze villes. Ils observent que la crise a accru la charge du travail de soins, avec des conséquences sur les moyens d'existence et la sécurité alimentaire. L'analyse sexospécifique de l'activité professionnelle et du travail de soins non rémunéré permet de comprendre les répercussions particulières de la crise sur les travailleurs informels dans le monde.
- Full Text:
- Authors: Ogando, Ana C , Rogan, Michael , Moussié, Rachel
- Date: 2022
- Subjects: To be catalogued
- Language: French
- Type: text , article
- Identifier: http://hdl.handle.net/10962/473894 , vital:77691 , https://doi.org/10.1111/ilrf.12239
- Description: Avec la pandémie de COVID‐19, la crise sanitaire et économique s'est doublée d'une crise du travail de soins. Tous les travailleurs en ont pâti, y compris dans l'économie informelle. Les auteurs exploitent les résultats d'une étude longitudinale menée par le réseau WIEGO en juin‐juillet 2020 auprès de travailleurs informels de douze villes. Ils observent que la crise a accru la charge du travail de soins, avec des conséquences sur les moyens d'existence et la sécurité alimentaire. L'analyse sexospécifique de l'activité professionnelle et du travail de soins non rémunéré permet de comprendre les répercussions particulières de la crise sur les travailleurs informels dans le monde.
- Full Text:
Electrocatalytic activity of benzothiazole substituted cobalt phthalocyanine in the presence of detonation nanodiamonds
- Ncwane, Lunathi, Mpeta, Lekhetho S, Nyokong, Tebello
- Authors: Ncwane, Lunathi , Mpeta, Lekhetho S , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295753 , vital:57375 , xlink:href="https://doi.org/10.1016/j.diamond.2022.109319"
- Description: This work reports on the synthesis and electrochemical sensing properties of benzothiazole substituted cobalt phthalocyanine (CoPc) when π-π stacked on detonation nanodiamonds (to form CoPc-DNDs(ππ). The synthesized materials were characterized using UV–visible, mass, Fourier transform infrared, and Raman spectroscopies as well as transmission electron microscopy and dynamic light scattering. The electrochemical studies were conducted using cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. Hydrazine was utilized as an analyte of interest, due to its mutagenic and carcinogenic effects. Glassy carbon electrodes (GCE) were modified with DNDs, CoPc, and CoPc-DNDs(ππ) represented as GCE/DNDs, GCE/CoPc and GCE/ CoPc-DNDs(ππ). GCE was also modified sequential addition of the CoPc and DNDs onto the GCE, represented as GCE/CoPc-DNDs(seq) when CoPc is placed before DNDs on the electrode and GCE/DNDs-CoPc(seq) when DNDs are placed before CoPc, where seq represents sequential. GCE/CoPc-DNDs(ππ) electrode gave better results in terms of limit of detection (1.68 μM), sensitivity (9.59 μA.mM−1) and catalytic rate constant (1.25 × 106 M−1 s−1).
- Full Text:
- Authors: Ncwane, Lunathi , Mpeta, Lekhetho S , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295753 , vital:57375 , xlink:href="https://doi.org/10.1016/j.diamond.2022.109319"
- Description: This work reports on the synthesis and electrochemical sensing properties of benzothiazole substituted cobalt phthalocyanine (CoPc) when π-π stacked on detonation nanodiamonds (to form CoPc-DNDs(ππ). The synthesized materials were characterized using UV–visible, mass, Fourier transform infrared, and Raman spectroscopies as well as transmission electron microscopy and dynamic light scattering. The electrochemical studies were conducted using cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry. Hydrazine was utilized as an analyte of interest, due to its mutagenic and carcinogenic effects. Glassy carbon electrodes (GCE) were modified with DNDs, CoPc, and CoPc-DNDs(ππ) represented as GCE/DNDs, GCE/CoPc and GCE/ CoPc-DNDs(ππ). GCE was also modified sequential addition of the CoPc and DNDs onto the GCE, represented as GCE/CoPc-DNDs(seq) when CoPc is placed before DNDs on the electrode and GCE/DNDs-CoPc(seq) when DNDs are placed before CoPc, where seq represents sequential. GCE/CoPc-DNDs(ππ) electrode gave better results in terms of limit of detection (1.68 μM), sensitivity (9.59 μA.mM−1) and catalytic rate constant (1.25 × 106 M−1 s−1).
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Electrochemical detection of human epidermal growth factor receptor 2 using an aptamer on cobalt phthalocyanines–Cerium oxide nanoparticle conjugate
- Centane, Sixolile, Mgidlana, Sithi, Openda, Yolanda, Nyokong, Tebello
- Authors: Centane, Sixolile , Mgidlana, Sithi , Openda, Yolanda , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/299835 , vital:57859 , xlink:href="https://doi.org/10.1016/j.bioelechem.2022.108146"
- Description: The role of the biointerface design towards the development of an impedimetric biosensor for the electrochemical detection of human epidermal growth factor receptor 2 (HER2) is investigated. Two novel cobalt phthalocyanines: cobalt tetraphenyl acetic acid phthalocyanine and cobalt tetraphenyl propionic acid phthalocyanine are compared as signal amplifiers and immobilization platforms of the HB5 aptamer towards the electrochemical detection of HER2. In addition, the phthalocyanines are coupled with the metal based cerium oxide nanoparticles. The efficiency of each electrode modification step and the performance of the constructed aptasensors were assessed by impedance spectroscopy. The aptasensors showed very low limit of detection values (all less than 0.2 ng/mL) with high sensitivity and stability. Furthermore, the aptasensors showed very good performance even in human serum samples. Considering these results, the aptasensors demonstrate great potential for improved monitoring of human epidermal growth factor receptor 2 levels for the management of breast cancers.
- Full Text:
- Authors: Centane, Sixolile , Mgidlana, Sithi , Openda, Yolanda , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/299835 , vital:57859 , xlink:href="https://doi.org/10.1016/j.bioelechem.2022.108146"
- Description: The role of the biointerface design towards the development of an impedimetric biosensor for the electrochemical detection of human epidermal growth factor receptor 2 (HER2) is investigated. Two novel cobalt phthalocyanines: cobalt tetraphenyl acetic acid phthalocyanine and cobalt tetraphenyl propionic acid phthalocyanine are compared as signal amplifiers and immobilization platforms of the HB5 aptamer towards the electrochemical detection of HER2. In addition, the phthalocyanines are coupled with the metal based cerium oxide nanoparticles. The efficiency of each electrode modification step and the performance of the constructed aptasensors were assessed by impedance spectroscopy. The aptasensors showed very low limit of detection values (all less than 0.2 ng/mL) with high sensitivity and stability. Furthermore, the aptasensors showed very good performance even in human serum samples. Considering these results, the aptasensors demonstrate great potential for improved monitoring of human epidermal growth factor receptor 2 levels for the management of breast cancers.
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Enacting Environmental Ethics Education for Wildlife Conservation using an Afrophilic ‘Philosophy for Children’approach
- Authors: Bhurekeni, John
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/389821 , vital:68487 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/224689"
- Description: Environmental Ethics Education has in recent years emerged as a critical tool for wildlife conservation research. Despite this, Environmental Ethics Education is paradoxically predominated by traditional forms of western science such as the concept of the Anthropocene which appears to exclude aspects of African life-worlds where the natural environment is considered a heritage component and is linked to onto-ethical understandings of human existence. The purpose of this study is to explore how African heritage-based knowledges and practices are understood by children who identify and understand the relevance of their totems and taboos associated with them, in relation to wildlife conservation. The study from which this paper is derived utilised formative interventionist methodology complemented by a multi-voiced decolonial approach to explore whether children-participants aged 8 to 11 years understand the purposes of their totems and associated taboos. To achieve this I used an Afrophilic Philosophy for Children pedagogical approach, which foregrounds dialogical learning and development of critical reflexive thinking skills. Emerging findings indicated that children associated their totems and connected taboos as tools for protection against environmental pollution and for minimising resource over-extraction. Findings further demonstrated improved learner agency and development of ethical reasoning among children. As participants’ respect for environmental conservation and sustainability was informed by the significance placed on their totems, I recommend the need for schools to develop generative curricula that take seriously context-based solutions to environmental problems. Future research should also consider understanding environmental conservation issues from a context-based perspective, which can inform existing heritage practices and pedagogies.
- Full Text:
- Authors: Bhurekeni, John
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/389821 , vital:68487 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/224689"
- Description: Environmental Ethics Education has in recent years emerged as a critical tool for wildlife conservation research. Despite this, Environmental Ethics Education is paradoxically predominated by traditional forms of western science such as the concept of the Anthropocene which appears to exclude aspects of African life-worlds where the natural environment is considered a heritage component and is linked to onto-ethical understandings of human existence. The purpose of this study is to explore how African heritage-based knowledges and practices are understood by children who identify and understand the relevance of their totems and taboos associated with them, in relation to wildlife conservation. The study from which this paper is derived utilised formative interventionist methodology complemented by a multi-voiced decolonial approach to explore whether children-participants aged 8 to 11 years understand the purposes of their totems and associated taboos. To achieve this I used an Afrophilic Philosophy for Children pedagogical approach, which foregrounds dialogical learning and development of critical reflexive thinking skills. Emerging findings indicated that children associated their totems and connected taboos as tools for protection against environmental pollution and for minimising resource over-extraction. Findings further demonstrated improved learner agency and development of ethical reasoning among children. As participants’ respect for environmental conservation and sustainability was informed by the significance placed on their totems, I recommend the need for schools to develop generative curricula that take seriously context-based solutions to environmental problems. Future research should also consider understanding environmental conservation issues from a context-based perspective, which can inform existing heritage practices and pedagogies.
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Enhanced mitochondria destruction on MCF-7 and HeLa cell lines in vitro using triphenyl-phosphonium-labelled phthalocyanines in ultrasound-assisted photodynamic therapy activity
- Nene, Lindokuhle Cindy, Magadla, Aviwe, Nyokong, Tebello
- Authors: Nene, Lindokuhle Cindy , Magadla, Aviwe , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295766 , vital:57376 , xlink:href="https://doi.org/10.1016/j.jphotobiol.2022.112553"
- Description: This work reports on the reactive oxygen species (ROS) generation and the therapeutic activities of new triphenyl-phosphonium-labelled phthalocyanines (Pcs), the 2,9,16,23-tetrakis(N-(N-butyl-4-triphenyl-phosphonium)- pyridine-4-yloxy) Zn(II) Pc (3) and 2,9,16,23-tetrakis-(N-(N-butyl-4-triphenyl-phosphonium)-morpholino) Zn(II) Pc (4) upon exposure to light, ultrasound and the combination of light and ultrasound. Two types of ROS were detected: the singlet oxygen (1O2) and hydroxyl radicals. For light irradiations, only the 1O2 was detected. An increase in the ROS generation was observed for samples treated with the combination of light and ultrasound compared to the light and ultrasound mono-treatments. The in vitro anticancer activity through photodynamic (PDT) and sonodynamic (SDT) therapy for the Pcs were also determined and compared to the photo-sonodynamic combination therapy (PSDT). The two cancer cell lines used for the in vitro studies included the Michigan Cancer Foundation-7 (MCF-7) breast cancer and Henrietta Lacks (HeLa) cervical cancer cell lines. The SDT treatments showed improved therapeutic efficacy on the cancer cells for both the Pcs compared to PDT. PSDT showed better therapeutic efficacy compared to both the PDT and SDT mono-treatments.
- Full Text:
- Authors: Nene, Lindokuhle Cindy , Magadla, Aviwe , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295766 , vital:57376 , xlink:href="https://doi.org/10.1016/j.jphotobiol.2022.112553"
- Description: This work reports on the reactive oxygen species (ROS) generation and the therapeutic activities of new triphenyl-phosphonium-labelled phthalocyanines (Pcs), the 2,9,16,23-tetrakis(N-(N-butyl-4-triphenyl-phosphonium)- pyridine-4-yloxy) Zn(II) Pc (3) and 2,9,16,23-tetrakis-(N-(N-butyl-4-triphenyl-phosphonium)-morpholino) Zn(II) Pc (4) upon exposure to light, ultrasound and the combination of light and ultrasound. Two types of ROS were detected: the singlet oxygen (1O2) and hydroxyl radicals. For light irradiations, only the 1O2 was detected. An increase in the ROS generation was observed for samples treated with the combination of light and ultrasound compared to the light and ultrasound mono-treatments. The in vitro anticancer activity through photodynamic (PDT) and sonodynamic (SDT) therapy for the Pcs were also determined and compared to the photo-sonodynamic combination therapy (PSDT). The two cancer cell lines used for the in vitro studies included the Michigan Cancer Foundation-7 (MCF-7) breast cancer and Henrietta Lacks (HeLa) cervical cancer cell lines. The SDT treatments showed improved therapeutic efficacy on the cancer cells for both the Pcs compared to PDT. PSDT showed better therapeutic efficacy compared to both the PDT and SDT mono-treatments.
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Enhanced Solar Efficiency via Incorporation of Plasmonic Gold Nanostructures in a Titanium Oxide/Eosin Y Dye-Sensitized Solar Cell
- Nyembe, Sanele, Chindeka, Francis, Ndlovu, Gebhu, Mkhohlakali, Andile, Nyokong, Tebello, Sikhwiyhilu, Lucy
- Authors: Nyembe, Sanele , Chindeka, Francis , Ndlovu, Gebhu , Mkhohlakali, Andile , Nyokong, Tebello , Sikhwiyhilu, Lucy
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295783 , vital:57377 , xlink:href="https://doi.org/10.3390/nano12101715"
- Description: Plasmonic gold nanoparticles significantly improved the efficiency of a TiO2 and Eosin Y based dye-sensitized solar cell from 2.4 to 6.43%. The gold nanoparticles’ sizes that were tested were 14 nm, 30 nm and 40 nm synthesized via the systematic reduction of citrate concentration using the Turkevich method. Prestine TiO2 without plasmonic gold nanoparticles yielded an efficiency of 2.4%. However, the loading of 40 nm gold nanoparticles into the TiO2 matrix yielded the highest DSSC efficiency of 6.43% compared to 30 nm (5.91%) and 14 nm (2.6%). The relatively high efficiency demonstrated by plasmonic gold nanoparticles is ascribed to light absorption/scattering, hot electron injection and plasmon-induced resonance energy transfer (PIRET), influenced by the size of the gold nanoparticles.
- Full Text:
- Authors: Nyembe, Sanele , Chindeka, Francis , Ndlovu, Gebhu , Mkhohlakali, Andile , Nyokong, Tebello , Sikhwiyhilu, Lucy
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295783 , vital:57377 , xlink:href="https://doi.org/10.3390/nano12101715"
- Description: Plasmonic gold nanoparticles significantly improved the efficiency of a TiO2 and Eosin Y based dye-sensitized solar cell from 2.4 to 6.43%. The gold nanoparticles’ sizes that were tested were 14 nm, 30 nm and 40 nm synthesized via the systematic reduction of citrate concentration using the Turkevich method. Prestine TiO2 without plasmonic gold nanoparticles yielded an efficiency of 2.4%. However, the loading of 40 nm gold nanoparticles into the TiO2 matrix yielded the highest DSSC efficiency of 6.43% compared to 30 nm (5.91%) and 14 nm (2.6%). The relatively high efficiency demonstrated by plasmonic gold nanoparticles is ascribed to light absorption/scattering, hot electron injection and plasmon-induced resonance energy transfer (PIRET), influenced by the size of the gold nanoparticles.
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Expansive Learning and Transformative Agency for Equity and Sustainability: Formative Interventions in Six Continents
- Engeström, Yrjö, Bal, Aydin, Sannino, Annalisa, Morgado, Luciana P, de Gouveia Vilela, R A, Querol, Marco P, Lotz-Sisitka, Heila, Wei, Ge, Chikunda, Charles, Hopwood, Nick, Virkkunen, Jaakko, Mukute, Mutizwa
- Authors: Engeström, Yrjö , Bal, Aydin , Sannino, Annalisa , Morgado, Luciana P , de Gouveia Vilela, R A , Querol, Marco P , Lotz-Sisitka, Heila , Wei, Ge , Chikunda, Charles , Hopwood, Nick , Virkkunen, Jaakko , Mukute, Mutizwa
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , symposium
- Identifier: http://hdl.handle.net/10962/436688 , vital:73293 , ISBN 978-3-030-99347-4 , https://repository.isls.org//handle/1/8974
- Description: This double symposium brings together activity-theoretical formative intervention research conducted in six continents. The aim is to illuminate and examine the common threads, important differences, and new challenges of formative inter-vention studies to address “wicked problems” in different cul-tural, political, and economic contexts. Formative interven-tions facilitate expansive learning and systemic transfor-mation led by local stakeholders in organizations and social movements. The formative intervention methodology is based on the principles of double stimulation and ascending from the abstract to the concrete. Its most well-known appli-cation is the Change Laboratory method. Formative interven-tions generate and support expansive learning and trans-formative agency. The current global crises of climate change, poverty and deepening inequalities are giving rise to what is called fourth generation activity theory for tackling fateful challenges by building heterogenous multiactivity coa-litions. The symposium will present the theoretical and peda-gogical challenges and possibilities in Change Laboratories and other formative interventions to develop just and sus-tainable solutions to global crises.
- Full Text:
- Authors: Engeström, Yrjö , Bal, Aydin , Sannino, Annalisa , Morgado, Luciana P , de Gouveia Vilela, R A , Querol, Marco P , Lotz-Sisitka, Heila , Wei, Ge , Chikunda, Charles , Hopwood, Nick , Virkkunen, Jaakko , Mukute, Mutizwa
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , symposium
- Identifier: http://hdl.handle.net/10962/436688 , vital:73293 , ISBN 978-3-030-99347-4 , https://repository.isls.org//handle/1/8974
- Description: This double symposium brings together activity-theoretical formative intervention research conducted in six continents. The aim is to illuminate and examine the common threads, important differences, and new challenges of formative inter-vention studies to address “wicked problems” in different cul-tural, political, and economic contexts. Formative interven-tions facilitate expansive learning and systemic transfor-mation led by local stakeholders in organizations and social movements. The formative intervention methodology is based on the principles of double stimulation and ascending from the abstract to the concrete. Its most well-known appli-cation is the Change Laboratory method. Formative interven-tions generate and support expansive learning and trans-formative agency. The current global crises of climate change, poverty and deepening inequalities are giving rise to what is called fourth generation activity theory for tackling fateful challenges by building heterogenous multiactivity coa-litions. The symposium will present the theoretical and peda-gogical challenges and possibilities in Change Laboratories and other formative interventions to develop just and sus-tainable solutions to global crises.
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Exploring the community structure of Afrotropical macroinvertebrate traits and ecological preferences along an agricultural pollution gradient in the Kat River, Eastern Cape, South Africa
- Akamagwuna, Frank C, Odume, Oghenekaro N, Richoux, Nicole B
- Authors: Akamagwuna, Frank C , Odume, Oghenekaro N , Richoux, Nicole B
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/454334 , vital:75336 , xlink:href="https://doi.org/10.1016/j.ecolind.2022.108570"
- Description: Agricultural activities impact riverine ecosystem structure, function, and processes. In the Afrotropical regions, research on agricultural effects on macroinvertebrate trait distribution is sparse. In this study, we investigated the spatial and temporal changes in the community structure of macroinvertebrate traits along an agricultural disturbance gradient in an Afrotropical River system. Physicochemical variables were sampled alongside macroinvertebrates at eight sites in the dry (winter and spring) and wet (summer and autumn) periods of 2018–2019. We grouped the sites into four categories using the percentage of agricultural land-use cover within each drainage area. Our results showed that agricultural pollution exhibited varying effects on traits and ecological preferences, with traits such as a predatory lifestyle, medium body-size (>10–20 mm), active swimming, possession of spiracles and haemoglobin, and adult aquatic life stage increasing with the pollution gradient. These traits were positively associated with nutrients (PO4+-P, NO2+-N, NH4+-N and NO3+-N), salinity, turbidity and temperature and were deemed tolerant of agricultural pollution. Shredding, crawling, and a preference for macrophytes as food showed strong positive associations with the least disturbed sites and were negatively associated with increasing nutrients, salinity, turbidity and water temperature. As such, these three traits were considered sensitive to agricultural pollution. The identified indicator traits can be used to predict the survival and distribution patterns of organisms under the impact of agriculture-induced stress.
- Full Text:
- Authors: Akamagwuna, Frank C , Odume, Oghenekaro N , Richoux, Nicole B
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/454334 , vital:75336 , xlink:href="https://doi.org/10.1016/j.ecolind.2022.108570"
- Description: Agricultural activities impact riverine ecosystem structure, function, and processes. In the Afrotropical regions, research on agricultural effects on macroinvertebrate trait distribution is sparse. In this study, we investigated the spatial and temporal changes in the community structure of macroinvertebrate traits along an agricultural disturbance gradient in an Afrotropical River system. Physicochemical variables were sampled alongside macroinvertebrates at eight sites in the dry (winter and spring) and wet (summer and autumn) periods of 2018–2019. We grouped the sites into four categories using the percentage of agricultural land-use cover within each drainage area. Our results showed that agricultural pollution exhibited varying effects on traits and ecological preferences, with traits such as a predatory lifestyle, medium body-size (>10–20 mm), active swimming, possession of spiracles and haemoglobin, and adult aquatic life stage increasing with the pollution gradient. These traits were positively associated with nutrients (PO4+-P, NO2+-N, NH4+-N and NO3+-N), salinity, turbidity and temperature and were deemed tolerant of agricultural pollution. Shredding, crawling, and a preference for macrophytes as food showed strong positive associations with the least disturbed sites and were negatively associated with increasing nutrients, salinity, turbidity and water temperature. As such, these three traits were considered sensitive to agricultural pollution. The identified indicator traits can be used to predict the survival and distribution patterns of organisms under the impact of agriculture-induced stress.
- Full Text:
Exploring the Incremental Improvements of YOLOv7 over YOLOv5 for Character Recognition
- Boby, Alden, Brown, Dane L, Connan, James, Marais, Marc
- Authors: Boby, Alden , Brown, Dane L , Connan, James , Marais, Marc
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/463395 , vital:76405 , xlink:href="https://link.springer.com/chapter/10.1007/978-3-031-35644-5_5"
- Description: Technological advances are being applied to aspects of life to improve quality of living and efficiency. This speaks specifically to automation, especially in the industry. The growing number of vehicles on the road has presented a need to monitor more vehicles than ever to enforce traffic rules. One way to identify a vehicle is through its licence plate, which contains a unique string of characters that make it identifiable within an external database. Detecting characters on a licence plate using an object detector has only recently been explored. This paper uses the latest versions of the YOLO object detector to perform character recognition on licence plate images. This paper expands upon existing object detection-based character recognition by investigating how improvements in the framework translate to licence plate character recognition accuracy compared to character recognition based on older architectures. Results from this paper indicate that the newer YOLO models have increased performance over older YOLO-based character recognition models such as CRNET.
- Full Text:
- Authors: Boby, Alden , Brown, Dane L , Connan, James , Marais, Marc
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/463395 , vital:76405 , xlink:href="https://link.springer.com/chapter/10.1007/978-3-031-35644-5_5"
- Description: Technological advances are being applied to aspects of life to improve quality of living and efficiency. This speaks specifically to automation, especially in the industry. The growing number of vehicles on the road has presented a need to monitor more vehicles than ever to enforce traffic rules. One way to identify a vehicle is through its licence plate, which contains a unique string of characters that make it identifiable within an external database. Detecting characters on a licence plate using an object detector has only recently been explored. This paper uses the latest versions of the YOLO object detector to perform character recognition on licence plate images. This paper expands upon existing object detection-based character recognition by investigating how improvements in the framework translate to licence plate character recognition accuracy compared to character recognition based on older architectures. Results from this paper indicate that the newer YOLO models have increased performance over older YOLO-based character recognition models such as CRNET.
- Full Text:
Exploring the Origins and Expansion of the Nyaminyami (Water Spirit) Belief Systems among the BaTonga People of Northwestern Zimbabwe
- Authors: Matanzima, Joshua
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478916 , vital:78239 , https://brill.com/view/journals/jra/51/3-4/article-p364_7.xml
- Description: Water spirits are an integral part of African traditional religious beliefs and ritual practices. Like many other African traditional religious practices and beliefs, water spirit beliefs are characterized by complex ‘myths’ surrounding their origins. In that regard, this paper explores the origins and expansion of the Nyaminyami (water spirit,) beliefs prevalent among some BaTonga people of northwestern Zimbabwe. It argues that these beliefs were exotic to the BaTonga people. In so doing, it substantiates the assumption by Elizabeth Colson and Thayer Scudder that Nyaminyami was a foreign idea to the BaTonga people. This study brings in new contemporary evidence to substantiate and extend this diffusionist perspective. It provides evidence from ethnographic research conducted among the BaTonga and Shangwe-speaking peoples living in the immediate vicinity of the Kariba Gorge area from April to November 2017. This study also rests on the wider scholarship on water divinities in Africa that explains the emergence of water divinities in different societies through diffusion of ideas. The study further examines the ways by which the cultural borrowing may have occurred, as well as the period and the extent to which the diffusion of ideas occurred, based on the ethnographic evidence.
- Full Text:
- Authors: Matanzima, Joshua
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/478916 , vital:78239 , https://brill.com/view/journals/jra/51/3-4/article-p364_7.xml
- Description: Water spirits are an integral part of African traditional religious beliefs and ritual practices. Like many other African traditional religious practices and beliefs, water spirit beliefs are characterized by complex ‘myths’ surrounding their origins. In that regard, this paper explores the origins and expansion of the Nyaminyami (water spirit,) beliefs prevalent among some BaTonga people of northwestern Zimbabwe. It argues that these beliefs were exotic to the BaTonga people. In so doing, it substantiates the assumption by Elizabeth Colson and Thayer Scudder that Nyaminyami was a foreign idea to the BaTonga people. This study brings in new contemporary evidence to substantiate and extend this diffusionist perspective. It provides evidence from ethnographic research conducted among the BaTonga and Shangwe-speaking peoples living in the immediate vicinity of the Kariba Gorge area from April to November 2017. This study also rests on the wider scholarship on water divinities in Africa that explains the emergence of water divinities in different societies through diffusion of ideas. The study further examines the ways by which the cultural borrowing may have occurred, as well as the period and the extent to which the diffusion of ideas occurred, based on the ethnographic evidence.
- Full Text:
Fabrication of asymmetrical morpholine phthalocyanines conjugated chitosan-polyacrylonitrile nanofibers for improved photodynamic antimicrobial chemotherapy activity
- Sindelo, Azole, Mafukidze, Donovan M, Nyokong, Tebello
- Authors: Sindelo, Azole , Mafukidze, Donovan M , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229873 , vital:49719 , xlink:href="https://doi.org/10.1016/j.pdpdt.2022.102760"
- Description: The work is based on the synthesis and photodynamic antimicrobial chemotherapy (PACT) activities of neutral (1 and 2) and cationic (1Q and 2Q) morpholine substituted phthalocyanines. For applicability, these complexes were covalently linked to modified polyacrylonitrile (PAN) to form 1-PAN, 2-PAN, 1Q-PAN, and 2Q-PAN, respectively. Chitosan was conjugated to PAN (to form PAN-CS) which was then linked to the Pcs to form PAN-CS-1, PAN-CS-2, PAN-CS-1Q, and PAN-CS-2Q, respectively. Singlet oxygen quantum yields improved following the inclusion of chitosan. The PACT activities of the complexes alone and when anchored to both PAN and PAN-CS was evaluated against bacteria: S. aureus, E. coli and fungi C. albicans. Cationic phthalocyanine showed high efficacy values of >7 log reduction value for all microorganisms. These results translated into excellent bacterial colony reduction of >90% against both S. aureus and C. albicans after 1 h of photoirradiation on PAN-CS support.
- Full Text:
- Authors: Sindelo, Azole , Mafukidze, Donovan M , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229873 , vital:49719 , xlink:href="https://doi.org/10.1016/j.pdpdt.2022.102760"
- Description: The work is based on the synthesis and photodynamic antimicrobial chemotherapy (PACT) activities of neutral (1 and 2) and cationic (1Q and 2Q) morpholine substituted phthalocyanines. For applicability, these complexes were covalently linked to modified polyacrylonitrile (PAN) to form 1-PAN, 2-PAN, 1Q-PAN, and 2Q-PAN, respectively. Chitosan was conjugated to PAN (to form PAN-CS) which was then linked to the Pcs to form PAN-CS-1, PAN-CS-2, PAN-CS-1Q, and PAN-CS-2Q, respectively. Singlet oxygen quantum yields improved following the inclusion of chitosan. The PACT activities of the complexes alone and when anchored to both PAN and PAN-CS was evaluated against bacteria: S. aureus, E. coli and fungi C. albicans. Cationic phthalocyanine showed high efficacy values of >7 log reduction value for all microorganisms. These results translated into excellent bacterial colony reduction of >90% against both S. aureus and C. albicans after 1 h of photoirradiation on PAN-CS support.
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For an African elenchus: colonial and postcolonial misprisions and Classics in Africa
- Authors: Van Schoor, David J
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/468468 , vital:77063 , https://doi.org/10.1093/bics/qbac002
- Description: This paper reflects on the god Dionysus in the context of African explorations of the role and meaning of Classical traditions in and for Africa. The problem of decolonization entails the creative challenge to conceive an African modernity, but how we shall recognize what that is to mean remains open. Knowledge as claim and contestation are foregrounded with Dionysus and in his presence. He is a figure who is chronically misprised, so that misprision itself becomes a feature of his experience and meaning. Offering examples of two kinds of popular interpretive stances and arguing that they represent typical but weak readings, the idea is developed that Africa requires elenchus as hermeneutic ideal, an epistemic pessimism and commitment to seeking as it finds its own way. It ought not, from a peripheral position, to adopt or reject the popular and low-yielding misprisions and cultural contestations that obtain in the Western academy and offer little to a flowering African Humanities.
- Full Text:
- Authors: Van Schoor, David J
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/468468 , vital:77063 , https://doi.org/10.1093/bics/qbac002
- Description: This paper reflects on the god Dionysus in the context of African explorations of the role and meaning of Classical traditions in and for Africa. The problem of decolonization entails the creative challenge to conceive an African modernity, but how we shall recognize what that is to mean remains open. Knowledge as claim and contestation are foregrounded with Dionysus and in his presence. He is a figure who is chronically misprised, so that misprision itself becomes a feature of his experience and meaning. Offering examples of two kinds of popular interpretive stances and arguing that they represent typical but weak readings, the idea is developed that Africa requires elenchus as hermeneutic ideal, an epistemic pessimism and commitment to seeking as it finds its own way. It ought not, from a peripheral position, to adopt or reject the popular and low-yielding misprisions and cultural contestations that obtain in the Western academy and offer little to a flowering African Humanities.
- Full Text:
Framing of political leaders during the# BringBackOurGirls campaign by the Nigerian Press: a comparative study of Guardian and Vanguard Newspapers
- Akpojivi, Ufuoma, Aiseng, Kealeboga
- Authors: Akpojivi, Ufuoma , Aiseng, Kealeboga
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/455214 , vital:75413 , https://doi.org/10.3389/fcomm.2022.853673
- Description: This study examines Nigeria's political leaders' framing during the #BringBackOurGirls movement campaign using two selected national newspapers in Nigeria, i.e., the Guardian and the Vanguard newspa-pers. Using 46 news stories culled during the periods of April 14, 2014, to June 14, 2014, and May 29, 2015, to July 29, 2015, which represent two significant eras, i.e., when the schoolgirls were abducted, and when there was a change in government, the study argued that four frames of government failure, the desperation of citizens, politicization of gov-ernment actions and heroism were dominant in both presses reportage. During the first period of study, both presses were critical of President Goodluck Jonathan and his inability to secure the release of the ab-ducted Chibok schoolgirl as they used frames of “liar”, “clueless”, and “failure” amongst others to characterize his government actions and in-actions. However, during the second study period, both presses were less critical of President Buhari as they ascribed the “hero” frame to him due to his vast military experience. Nevertheless, the ideological posi-tion of both newspapers influenced their reportage as Guardian news stories provided depth analysis, while Vanguard newspaper stories lacked depth.
- Full Text:
- Authors: Akpojivi, Ufuoma , Aiseng, Kealeboga
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/455214 , vital:75413 , https://doi.org/10.3389/fcomm.2022.853673
- Description: This study examines Nigeria's political leaders' framing during the #BringBackOurGirls movement campaign using two selected national newspapers in Nigeria, i.e., the Guardian and the Vanguard newspa-pers. Using 46 news stories culled during the periods of April 14, 2014, to June 14, 2014, and May 29, 2015, to July 29, 2015, which represent two significant eras, i.e., when the schoolgirls were abducted, and when there was a change in government, the study argued that four frames of government failure, the desperation of citizens, politicization of gov-ernment actions and heroism were dominant in both presses reportage. During the first period of study, both presses were critical of President Goodluck Jonathan and his inability to secure the release of the ab-ducted Chibok schoolgirl as they used frames of “liar”, “clueless”, and “failure” amongst others to characterize his government actions and in-actions. However, during the second study period, both presses were less critical of President Buhari as they ascribed the “hero” frame to him due to his vast military experience. Nevertheless, the ideological posi-tion of both newspapers influenced their reportage as Guardian news stories provided depth analysis, while Vanguard newspaper stories lacked depth.
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From affirmative to transformative approaches to academic development
- McKenna, Sioux, Hlengwa, Amanda, Quinn, Lynn, Vorster, Jo-Anne E
- Authors: McKenna, Sioux , Hlengwa, Amanda , Quinn, Lynn , Vorster, Jo-Anne E
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426651 , vital:72375 , xlink:href="https://doi.org/10.1080/13562517.2022.2119077"
- Description: Much academic development work, whether it be student, academic staff, institutional or curriculum development, is undertaken from an affirmative rather than a transformative approach (Luckett, L., and S. Shay. 2020.“Reframing the Curriculum: A Transformative Approach.” Critical Studies in Education61 (1): 50–65). To be transformative, academic development has to reframe the problem beyond one of poor student retention and throughput. We need to make sense of the conditions from which issues such as poor retention and throughput rates emerge, rather than focusing on mitigating the effects of such conditions within the status quo. Drawing on Fraser’s concept of parity of participation, we suggest that if academic development is to engage in transformative approaches, it needs to adjust the scale of the problem and challenge underpinning assumptions, and thereby review the fitness of universities, curricula and academic development practices for a pluralist society. In sum, a transformative approach to academic development work will entail conceptualising academic development as a political knowledge project.
- Full Text:
- Authors: McKenna, Sioux , Hlengwa, Amanda , Quinn, Lynn , Vorster, Jo-Anne E
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426651 , vital:72375 , xlink:href="https://doi.org/10.1080/13562517.2022.2119077"
- Description: Much academic development work, whether it be student, academic staff, institutional or curriculum development, is undertaken from an affirmative rather than a transformative approach (Luckett, L., and S. Shay. 2020.“Reframing the Curriculum: A Transformative Approach.” Critical Studies in Education61 (1): 50–65). To be transformative, academic development has to reframe the problem beyond one of poor student retention and throughput. We need to make sense of the conditions from which issues such as poor retention and throughput rates emerge, rather than focusing on mitigating the effects of such conditions within the status quo. Drawing on Fraser’s concept of parity of participation, we suggest that if academic development is to engage in transformative approaches, it needs to adjust the scale of the problem and challenge underpinning assumptions, and thereby review the fitness of universities, curricula and academic development practices for a pluralist society. In sum, a transformative approach to academic development work will entail conceptualising academic development as a political knowledge project.
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From imperialism to radical hospitality: propositions for reconfiguring social work towards a justice-to-come
- Bozalek, Vivienne, Holscher, Dorothee
- Authors: Bozalek, Vivienne , Holscher, Dorothee
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426904 , vital:72399 , xlink:href="https://doi.org/10.25159/2708-9355/8889"
- Description: The focus of the article is on injustices towards South African families in postcolonial and neocolonial contexts, our understanding of which has been greatly enlarged by Nancy Fraser’s conceptualisations of expropriation and imperialism and Jacques Derrida’s notions of hostility and hospitality. We used Walter Benjamin’s and Karen Barad’s montage methods of fragmentary writing to diffractively read expropriation, imperialism, hostility and hospitality through one another in the context of injustices done to South African families. A diffractive methodology entails a close and attentive reading of concepts or pieces of text through one another, to arrive at new insights with regard to a particular issue. The new insights we arrive at in the article are five propositions for ethically engaging in a justice-to-come for social work – that of attentiveness, rendering each other capable, responsibility, response-ability and radical hospitality.
- Full Text:
- Authors: Bozalek, Vivienne , Holscher, Dorothee
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/426904 , vital:72399 , xlink:href="https://doi.org/10.25159/2708-9355/8889"
- Description: The focus of the article is on injustices towards South African families in postcolonial and neocolonial contexts, our understanding of which has been greatly enlarged by Nancy Fraser’s conceptualisations of expropriation and imperialism and Jacques Derrida’s notions of hostility and hospitality. We used Walter Benjamin’s and Karen Barad’s montage methods of fragmentary writing to diffractively read expropriation, imperialism, hostility and hospitality through one another in the context of injustices done to South African families. A diffractive methodology entails a close and attentive reading of concepts or pieces of text through one another, to arrive at new insights with regard to a particular issue. The new insights we arrive at in the article are five propositions for ethically engaging in a justice-to-come for social work – that of attentiveness, rendering each other capable, responsibility, response-ability and radical hospitality.
- Full Text:
From PowerPoint to Zoom: Interrogating the Gaze in Teaching at a Small South African University
- Authors: Dalvit, Lorenzo
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/468184 , vital:77028 , ISBN 9781003275060 , https://www.taylorfrancis.com/chapters/edit/10.4324/9781003275060-4/powerpoint-zoom-lorenzo-dalvit
- Description: I teach Digital Media and Cultural Studies at a small residential university in South Africa. Due to retinal degeneration, I had to progressively move away from paper documents and increasingly rely on electronic tools and resources as well as a student assistant. In this chapter, I draw on the concept of the gaze as understood within the critical tradition to reflect on my journey with a specific focus on teaching. The departing and arrival stations of such a journey are PowerPoint presentations (which students have come to expect as part of a lecture) and Zoom meetings (which have become part of our new normal as a result of emergency remote teaching). Using PowerPoint reverses the power dynamics in the classroom. Rather than each student facing the all-seeing lecturer, I am placed under scrutiny as I try to memorise my presentation and rely on my assistant to keep up with the slides and alert me of questions. In our context, virtual lectures via Zoom are audio-only due to bandwidth constraints. My screen reader notifies me when students raise their hand and tells me who they are. I can also use earphones to listen to my own notes on a second device, which I found very empowering
- Full Text:
- Authors: Dalvit, Lorenzo
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/468184 , vital:77028 , ISBN 9781003275060 , https://www.taylorfrancis.com/chapters/edit/10.4324/9781003275060-4/powerpoint-zoom-lorenzo-dalvit
- Description: I teach Digital Media and Cultural Studies at a small residential university in South Africa. Due to retinal degeneration, I had to progressively move away from paper documents and increasingly rely on electronic tools and resources as well as a student assistant. In this chapter, I draw on the concept of the gaze as understood within the critical tradition to reflect on my journey with a specific focus on teaching. The departing and arrival stations of such a journey are PowerPoint presentations (which students have come to expect as part of a lecture) and Zoom meetings (which have become part of our new normal as a result of emergency remote teaching). Using PowerPoint reverses the power dynamics in the classroom. Rather than each student facing the all-seeing lecturer, I am placed under scrutiny as I try to memorise my presentation and rely on my assistant to keep up with the slides and alert me of questions. In our context, virtual lectures via Zoom are audio-only due to bandwidth constraints. My screen reader notifies me when students raise their hand and tells me who they are. I can also use earphones to listen to my own notes on a second device, which I found very empowering
- Full Text:
Fuelwood in South Africa Revisited: Widespread Use in a Policy Vacuum
- Shackleton, Charlie M, Sinasson Sanni, Giséle K, Adeyemi, Opeyemi, Martins, Vusumzi
- Authors: Shackleton, Charlie M , Sinasson Sanni, Giséle K , Adeyemi, Opeyemi , Martins, Vusumzi
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/402275 , vital:69837 , xlink:href="https://doi.org/10.3390/su141711018"
- Description: South Africa has experienced massive urbanisation and socioeconomic development over the past two decades. Concomitantly, the national energy policy focuses on the provision of modern fuels, notably electricity, for domestic use. Given this policy environment and socioeconomic development, we examine pertinent literature and policies from South Africa on fuelwood use, value, and sustainability to understand how it might have changed in tandem with the national shifts in urbanisation and socioeconomic development over the last 20 years. Recent literature shows that fuelwood is still used to some extent by 96% of rural households and 69% of low-income urban ones. We also estimate that the use of fuelwood by rural households alone is valued at approximately ZAR 10.5 billion (approx. USD 700 million) annually, with the probability of an equally high value to low-income urban households. However, despite the extensive use and high value, our analysis of cognate national policies related to energy, forestry, environment, and social development, show that fuelwood and its use is hardly considered, indicating a policy vacuum. This policy vacuum means that there is no strategic or apposite support or interventions in any localised areas where fuelwood demand might exceed supply, thereby undermining the livelihoods and energy security of affected citizens, most notably the poor.
- Full Text:
- Authors: Shackleton, Charlie M , Sinasson Sanni, Giséle K , Adeyemi, Opeyemi , Martins, Vusumzi
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/402275 , vital:69837 , xlink:href="https://doi.org/10.3390/su141711018"
- Description: South Africa has experienced massive urbanisation and socioeconomic development over the past two decades. Concomitantly, the national energy policy focuses on the provision of modern fuels, notably electricity, for domestic use. Given this policy environment and socioeconomic development, we examine pertinent literature and policies from South Africa on fuelwood use, value, and sustainability to understand how it might have changed in tandem with the national shifts in urbanisation and socioeconomic development over the last 20 years. Recent literature shows that fuelwood is still used to some extent by 96% of rural households and 69% of low-income urban ones. We also estimate that the use of fuelwood by rural households alone is valued at approximately ZAR 10.5 billion (approx. USD 700 million) annually, with the probability of an equally high value to low-income urban households. However, despite the extensive use and high value, our analysis of cognate national policies related to energy, forestry, environment, and social development, show that fuelwood and its use is hardly considered, indicating a policy vacuum. This policy vacuum means that there is no strategic or apposite support or interventions in any localised areas where fuelwood demand might exceed supply, thereby undermining the livelihoods and energy security of affected citizens, most notably the poor.
- Full Text:
Fuelwood Production and Carbon Sequestration in Public Urban Green Spaces in Bulawayo, Zimbabwe
- Ngulani, Thembelihle, Shackleton, Charlie M
- Authors: Ngulani, Thembelihle , Shackleton, Charlie M
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438757 , vital:73497 , xlink:href="https://doi.org/10.3390/f13050741"
- Description: Understanding tree species autecology and population structure supports effective conservation actions. Of particular importance are multipurpose trees that provide non-timber forest products (NTFPs). We assessed the population structures and morphologies of two species of NTFP trees in the genus Mimusops across bioclimatic zones in Benin by sampling 288 plots within 11 forests. Structural characteristics were compared between species, forests and zones. Correlations were also observed between Mimusops tree regeneration density, tree features and ecological characteristics. The density of trees ≥5 cm and of regeneration and mean tree height were higher for M. andongensis (within more protected forest) than M. kummel (in forests with access to people), while the highest mean diameter was observed for M. kummel. Tree and regeneration densities and mean height were greatest in the humid zone of Benin, whilst the largest mean diameter was obtained in the sub-humid zone. The results showed significant correlations between regeneration density and soil properties for M. andongensis but not for M. kummel. The correlations between tree morphology and soil characteristics were weak for both species. Ecological characteristics, along with the species’ functional traits and pressures, are important factors related to the observed differences between the species. All diameter classes were represented, and the population seemed more stable in the more protected forest relative to other forests. Mimusops trees with a diameter of 5–15 cm represented more than 30% of this species in most forests; this suggests, for M. kummel, whose trees flower when quite small (≥6 cm dbh), that there are sufficient reproductive trees. Thus, as a long-lived species, its populations could be maintained even with low/episodic recruitment. However, we found no regeneration in many forests and climate change could threaten populations. Therefore, it is important to investigate regeneration growth and dynamics, seed production and germination of the species in relation to the biophysical conditions and disturbances experienced by Mimusops stands.
- Full Text:
- Authors: Ngulani, Thembelihle , Shackleton, Charlie M
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438757 , vital:73497 , xlink:href="https://doi.org/10.3390/f13050741"
- Description: Understanding tree species autecology and population structure supports effective conservation actions. Of particular importance are multipurpose trees that provide non-timber forest products (NTFPs). We assessed the population structures and morphologies of two species of NTFP trees in the genus Mimusops across bioclimatic zones in Benin by sampling 288 plots within 11 forests. Structural characteristics were compared between species, forests and zones. Correlations were also observed between Mimusops tree regeneration density, tree features and ecological characteristics. The density of trees ≥5 cm and of regeneration and mean tree height were higher for M. andongensis (within more protected forest) than M. kummel (in forests with access to people), while the highest mean diameter was observed for M. kummel. Tree and regeneration densities and mean height were greatest in the humid zone of Benin, whilst the largest mean diameter was obtained in the sub-humid zone. The results showed significant correlations between regeneration density and soil properties for M. andongensis but not for M. kummel. The correlations between tree morphology and soil characteristics were weak for both species. Ecological characteristics, along with the species’ functional traits and pressures, are important factors related to the observed differences between the species. All diameter classes were represented, and the population seemed more stable in the more protected forest relative to other forests. Mimusops trees with a diameter of 5–15 cm represented more than 30% of this species in most forests; this suggests, for M. kummel, whose trees flower when quite small (≥6 cm dbh), that there are sufficient reproductive trees. Thus, as a long-lived species, its populations could be maintained even with low/episodic recruitment. However, we found no regeneration in many forests and climate change could threaten populations. Therefore, it is important to investigate regeneration growth and dynamics, seed production and germination of the species in relation to the biophysical conditions and disturbances experienced by Mimusops stands.
- Full Text: