Exploring group solidarity for insights into qualities of T-learning
- Authors: Mudokwani, Kuda , Mukute, Mutizwa
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/390612 , vital:68568 , xlink:href="https://doi.org/10.3390/su11236825"
- Description: Across the world, organised groups of farmers participating in just and sustainability transformations encounter multiple obstacles. Through solidarity manifested in iterative processes of questioning, co-learning, collective action and reflection, and value creation for themselves and for others, some succeed in overcoming them. This article investigates how a district organic farmer association in Zimbabwe is encountering and handling group solidarity challenges arising from shifting from local to district level coordinated organic production and marketing. Based on the use of change laboratory, this paper explores solidarity at the local niche and networked district level to seek insights into the qualities of T-learning.
- Full Text:
- Date Issued: 2019
Fabrication of efficient nonlinear optical absorber using Zn phthalocyanine-semiconductor quantum dots conjugates
- Authors: Mgidlana, Sithi , Oluwole, David O , Nyokong, Tebello
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187496 , vital:44663 , xlink:href="https://doi.org/10.1016/j.poly.2018.11.024"
- Description: In this paper, we report on the synthesis of Zn(II) phthalocyanine derivatives and their conjugates with core/shell and core/shell/shell semiconductor quantum dots (SQDs). Zn(II) mono amino-carboxyethylphenoxy phthalocyanine (1), Zn(II) mono 3-carboxyphenoxy-tris(pyridin-2-yloxy) phthalocyanine (2) and Zn(II) mono aminophenoxy-tris(benzothiazole) phthalocyanine (3) were synthesized. The photophysical and optical limiting properties of the phthalocyanine (Pc) complexes and their conjugates with SQDs were investigated in dimethyl sulfoxide. The optical limiting behaviour of the Pc complexes and their conjugates were measured by the open aperture Z-scan technique at laser excitation wavelength of 532 nm with 10 ns pulse. The conjugates outperformed the Pc complexes alone with the conjugates of 2-SQDs affording highest nonlinear absorption coefficient (βeff) value of ∼80 cm/GW and lowest limiting threshold (Ilim) value of ∼0.27 J·cm−2 as compared to other samples while complex 1 gave low βeff and high Ilim values of 42.2 cm/GW and 1.39 J·cm−2, respectively.
- Full Text:
- Date Issued: 2019
Finding ‘pulses of freedom’ in the border zone between higher and public education for sustainable development
- Authors: Lotz-Sisitka, Heila
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/436866 , vital:73311 , ISBN 9780367076436 , https://www.routledge.com/Prioritizing-Sustainability-Education-A-Comprehensive-Approach/Armon-Scoffham-Armon/p/book/9780367076436
- Description: Education for Sustainable Development (ESD) in Higher Edu-cation has long been a subject of discussion (eg Sterling, 2010; Togo and Lotz-Sisitka, 2013; Baarth, Michelsen, Rieckmann, and Thomas, 2016), with an increasing number of arguments being put forward for transformative, and even transgressive (ie transgressing the taken for granted) learning in these contexts (Lotz-Sisitka, Wals, Kronlid, and McGarry, 2015). There is, however, as yet little theoretical or practical work that focuses on the border zone or the interface between Higher Education and Public Education, due perhaps to an overemphasis on internal change in Higher Education settings. Public Education brings sustainable development (SD) into everyday life focus (Von Poeck et al., 2012), as it is here that complex, ‘wicked’ problems (Rittel and Webber, 1973) are ex-perienced. Such problems defy easy resolution. In this chapter I address this gap in the ESD literature by drawing on three cases of public education praxis in the border zone between Higher Education and Public Education: 1) using mobile learn-ing tools to transform markets for small holder farmers; 2) build-ing social learning networks that cross boundaries between colleges, farmers, and universities; and 3) using arts-based creative practice methods for public action. I start with these case stories, exploring them theoretically in order to illuminate new possibilities for ESD praxis in the sections that follow.
- Full Text:
- Date Issued: 2019
First record of an indigenous South African parasitoid wasp on an imported biological control agent, the water hyacinth hopper
- Authors: Kraus, Emily C , Coetzee, Julie A , van Noort, Simon , Olmi, Massimo
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/417462 , vital:71455 , xlink:href="https://doi.org/10.1080/09583157.2019.1660306"
- Description: Water hyacinth, Pontederia crassipes (Martius) [≡Eichhornia crassip es (Martius) Solms-Laubach] (Pontederiaceae), is native to South America, but has expanded its range to many other regions of the world including South Africa. Megamelus scutellaris Berg (Hemiptera: Delphacidae) was released as a biological control agent and has established in several regions. Recently, the indigenous species Echthrodelphax migratorius Benoit, (Hymenoptera: Dryinidae) was discovered in South Africa parasitising M. scutellaris. This newly discovered relationship might have repercussions for the efficacy of biological control of water hyacinth by the delphacid. The wasp may negatively impact M. scutellaris populations making it difficult for the agent to successfully manage the invasive weed. Contrarily, the parasitoid may be beneficial by keeping the M. scutellaris populations stable, serving as a natural enemy.
- Full Text:
- Date Issued: 2019
Fluorescence “turn-ON” nanosensor for cyanide ion using supramolecular hybrid of graphene quantum dots and cobalt pyrene-derivatized phthalocyanine
- Authors: Achadu, Ojodomo John , Nyokong, Tebello
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/187594 , vital:44674 , xlink:href="https://doi.org/10.1016/j.dyepig.2018.08.038"
- Description: A functional hybrid of graphene quantum dots (GQDs) and cobalt pyrene-derivatized phthalocyanine (CoPc) used as a sensitive nanoprobe for the recognition of cyanide ion (CN−) is described in this work. The fluorescence of GQDs was quenched upon non-covalent (π-π stacking) hybrid formation with CoPc via a possible energy transfer pathway. However, in the presence of CN−, the interaction between GQDs and CoPc was perturbed, such that the fluorescence of GQDs initially quenched by CoPc was found to be efficiently recovered in the presence of CN−. Amongst the molecules and anions tested to ascertain their effects on the fluorescence behaviour of the hybrid, only CN− ion induced the tunable “off-on” restoration of the fluorescence of GQDs, which demonstrates the selectivity of the hybrid towards CN−. The restored fluorescence signals of the GQDs were linearly modulated by different concentrations of CN− and were used for the quantitative assay of CN− with high sensitivity coupled with rapid detection time. The detection was in the linear range of 1.0–50.0 nM with limits of detection (LOD) of 0.5 nM. The analysis of spiked samples for the recovery of CN− further demonstrated the applicability of the hybrid for the satisfactory detection of the target analyte.
- Full Text:
- Date Issued: 2019
Focus on ‘the family’? How South African family policy fails queer families
- Authors: Macleod, Catriona I , Morison, Tracy , Lynch, Ingrid
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/434398 , vital:73054 , ISBN 9780367777401 , https://www.routledge.com/Queer-Kinship-South-African-Perspectives-on-the-Sexual-politics-of-Family-making-and-Belonging/Morison-Lynch-Reddy/p/book/9780367777401
- Description: The most policy document is the White Paper on Families, which aims to facilitate the mainstreaming of a family perspective into all government policy-making from the national to the municipal level and across multiple departments. The irony is that less than a third of South African families actually conform to the two cisgender heterosexual biological parent model that is favoured in family policy. South African research has shown that children of lesbian parents learn open-mindedness and to be comfortable with the family in which they live, and that men in same-sex relationships challenge gendered divisions of household tasks. Promoting the two-biological-parent family as the preferred family structure creates an impossible ideal for the majority of South Africans to live up to. Because such a family structure is strongly connected to class, it is out of reach for the majority of citizens, let alone those who live in queer relationships.
- Full Text:
- Date Issued: 2019
Food insecurity in South Africa: To what extent can social grants and consumption of wild foods eradicate hunger?
- Authors: Chakona, Gamuchirai , Shackleton, Charlie M
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/179541 , vital:43081 , xlink:href="https://doi.org/10.1016/j.wdp.2019.02.001"
- Description: As the world continues to face widespread food insecurity, achieving food security for all at all times is increasingly complicated. In South Africa, social grants and the use of wild foods have been reported as some ways to improve household food insecurity and reduce poverty. The study examined if social grants and consumption of wild foods alleviate food insecurity in South Africa. Household surveys and focus group discussions were conducted along the rural-urban continuum in three South African towns situated along an agro-ecological gradient. We explored the differences in household food security indicators, mean monthly food expenditure and wealth index between households receiving social grants, households consuming wild foods, and those who did not. Households receiving social grants were more food insecure with lower mean monthly food expenditure and wealth index than those who did not. Overall all towns, the use of wild foods improved household food security which was not true within towns where wild foods were mostly consumed by low income and more food insecure households. Social grants alone cannot eradicate food insecurity as the money is not enough to cater for all household needs whilst wild foods can potentially alleviate household food insecurity. As food prices continue to increase gradually and worsening household food insecurity, ways to shift ‘income circumstances’ of households and promote the use and consumption of wild foods which may increase dietary diversity and diversifying food access. Focus should be placed on capacity building, employment creation and promoting awareness on own food production which is one way to improve food security of poor households rather than depending on purchases from the grant money alone.
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- Date Issued: 2019
Formative interventionist research generating iterative mediation processes in a vocational education and training learning network
- Authors: Lotz-Sisitka, Heila , Pesanayi, Tichaona V
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/370575 , vital:66356 , ISBN 9780429279362 , https://doi.org/10.4324/9780429279362
- Description: This chapter addresses a research problem identified in the vocational agricultural learning system where there was a gap in vocational education and training knowledge flow from research institutions to knowledge users. The chapter develops a theoretical framework for dealing with the problem of ‘knowledge flow’ in vocational education and training settings. The problem emerges around the uptake and use of relevant research-based knowledge resources on rainwater harvesting and conservation practices for agricultural education and training focused on small-scale farmers and household food producers in South Africa. These resources, despite their contemporary relevance, were not being used in agricultural colleges or in the related agricultural learning support system. Drawing on a social ecosystemic approach to knowledge flow and mediation, the chapter surfaces five iterative mediation processes developed via a generative, formative interventionist research process over a five year period (Lotz-Sisitka et al. 2016; Pesanayi, 2019; cf. Chapter 8) that facilitated the development of a regional learning network which enabled vertical facilitatory processes and horizontal connectivities that impacted on farmers’ food production system, as well as the agricultural learning system. We illuminate key features of these as important for supporting knowledge flow within a regional social ecosystemic framework for skills development.
- Full Text:
- Date Issued: 2019
Formative interventionist research generating iterative mediation processes in a vocational education and training learning network
- Authors: Lotz-Sisitka, Heila , Pesanayi, Tichaona
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/435998 , vital:73219 , ISBN 9780429279362 , https://www.taylorfrancis.com/chapters/edit/10.4324/9780429279362-13/synthesis-elaboration-critical-realist-methodology-green-skills-research-eureta-rosenberg
- Description: This chapter addresses a research problem identified in the vocational agricultural learning system where there was a gap in vocational education and training knowledge flow from research institutions to knowledge users. The chapter develops a theoretical framework for dealing with the problem of ‘knowledge flow’ in vocational education and training settings. The problem emerges around the uptake and use of relevant research-based knowledge resources on rainwater harvesting and conservation practices for agricultural education and training focused on small-scale farmers and household food producers in South Africa. These resources, despite their con-temporary relevance, were not being used in agricultural col-leges or in the related agricultural learning support system. Drawing on a social ecosystemic approach to knowledge flow and mediation, the chapter surfaces five iterative mediation processes developed via a generative, formative interventionist research process over a five year period (Lotz-Sisitka et al. 2016; Pesanayi, 2019; cf. Chapter 8) that facilitated the development of a regional learning network which enabled vertical facilitatory processes and horizontal connectivities that impact-ed on farmers’ food production system, as well as the agricultural learning system. We illuminate key features of these as important for supporting knowledge flow within a regional social ecosystemic framework for skills development.
- Full Text:
- Date Issued: 2019
Framing learning needs assessments for sustainability policy practices
- Authors: Rosenberg, Eureta
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/436016 , vital:73220 , ISBN 9780429279362 , https://www.taylorfrancis.com/chapters/edit/10.4324/9780429279362-13/synthesis-elaboration-critical-realist-methodology-green-skills-research-eureta-rosenberg
- Description: A common (green) skills planning objective is to identify the learning needs of workers in particular sectors, programmes or organisations, in order to provide them with appropriate learn-ing opportunities. This chapter describes a design and concep-tual framing for learning needs assessments focused on sus-tainability or green economy policy practitioners. Measures for achieving credible results include design features for building consensus around the findings, but also a sound conceptual framing of learning needs. The chapter provides pointers for working critically with the notion of competencies, exploring both the value and the limitations of the concept, and framing it as relational transformational agency entailing technical, rela-tional and ethical affordances among collectives involved in sustainability policy-practice. The chapter draws on the Green Economy Learning Assessment for South Africa, which exlored the learning needs of sustainability practitioners in pol-icy contexts related to sustainable transport, renewable energy procurement and water resource management, among others. The chapter shares examples of competencies identified in these contexts, and concludes with a few curriculum pointers, in anticipation of the next chapter’s focus on the educational provider’s perspective. A common (green) skills planning objective is to identify the learning needs of workers in particular sectors, programmes or organisations, in order to provide them with appropriate learn-ing opportunities. This chapter describes a design and concep-tual framing for learning needs assessments focused on sus-tainability or green economy policy practitioners. Measures for achieving credible results include design features for building consensus around the findings, but also a sound conceptual framing of learning needs. The chapter provides pointers for working critically with the notion of competencies, exploring both the value and the limitations of the concept, and framing it as relational transformational agency entailing technical, rela-tional and ethical affordances among collectives involved in sustainability policy-practice. The chapter draws on the Green Economy Learning Assessment for South Africa, which exlored the learning needs of sustainability practitioners in pol-icy contexts related to sustainable transport, renewable energy procurement and water resource management, among others. The chapter shares examples of competencies identified in these contexts, and concludes with a few curriculum pointers, in anticipation of the next chapter’s focus on the educational provider’s perspective.
- Full Text:
- Date Issued: 2019
From academic to political rigour: Insights from the ‘Tarot’ of transgressive research
- Authors: Temper, Leah , McGarry, Dylan K , Weber, Lena
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/390629 , vital:68570 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/186598"
- Description: The role of science and knowledge production is at a crossroads, as societal transformation calls for challenging dominant forms of knowledge production that have contributed to marginalizing other ways of knowing. This presents a challenge to mainstream science and invites a deeper reflection on our roles as scientists and exploration of alternative engaged, post-normal and activist approaches to research. This paper examines the diverse ways researchers are meeting this challenge. Employing the device of the Tarot deck we describe seven “characters” to illustrate the variety of roles and approaches that trans-disciplinary, transformative, transgressive and activist researchers are engaging in. These characters are used to introduce and develop the concept of political rigour as a means of expanded academic rigour in new emancipatory scientific paradigms. We demonstrate how these Tarot characters can be used as an activity for collective and personal reflexivity and propose ten principles that frequently emerge in a ‘political’ peer review process. We argue that the insights emerging from these strands of radical, critical, engaged and applied forms of scholarship, can significantly improve the understanding of what a “transformative knowledge paradigm” may look like in practice and how it can be mobilized for social change and environmental justice.
- Full Text:
- Date Issued: 2019
Grasses as suitable targets for classical weed biological control
- Authors: Sutton, Guy F , Day, Michael D , Den Breeyen, Alana , Goolsby, J A , Cristofaro, M , McConnachie, Andrew J , Paterson, Iain D
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/417984 , vital:71499 , xlink:href="https://doi.org/10.1007/s10526-019-09968-8"
- Description: Grasses are amongst the most abundant and environmentally damaging invasive weeds worldwide. Biological control is frequently employed as a sustainable and cost-effective management strategy for many weeds. However, grasses have not been actively pursued as targets for classical weed biological control due to a perceived lack of sufficiently specialised and damaging natural enemies to use as biological control agents. There are also concerns that the risk posed to economically important crop/pasture species and closely-related native species is too great to consider implementing biological control for invasive grasses. In this paper, we review the literature and demonstrate that grasses can possess suitably host-specific and damaging natural enemies to warrant consideration as potential biological control agents. The risk of grass biological control is no greater than for other weedy taxa if practitioners follow appropriately rigorous risk assessments protocols.
- Full Text:
- Date Issued: 2019
Green skills for agriculture A method for focusing demand analysis and prioritisation
- Authors: Rosenberg, Eureta
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/436026 , vital:73221 , ISBN 9780429279362 , https://www.taylorfrancis.com/chapters/edit/10.4324/9780429279362-13/synthesis-elaboration-critical-realist-methodology-green-skills-research-eureta-rosenberg
- Description: This chapter is the second of the occupational demand studies that share insights about a methodology for determining green skills demand with a laminated approach and value chain anal-ysis. Based on research into skills for Climate Smart Agriculture (Cobban and Visser, 2017), it provides insight into the history and features of agriculture in South Africa that shape current skills needs. Drawing on one component of Cobban and Visser’s study, and employing a critical revision of the ‘climate smart’ framing, it shares findings about what green skills are needed for more sustainable poultry farming in which occupations to contextualise the discussion on methodology. This chapter contrasts the layered, in-depth green skills studies with approaches aiming for broader coverage and representivity, and illustrates the use of multi-criterion ‘hotspotting’ to prioritise among skills needs at strategic leverage points for social-ecological trans-formation. The case of the agricultural study illustrates the val-ue of smaller scale, in-depth studies that provide the occupa-tion level insights to inform skills planning and investment that is needed if agriculture is to sustain itself and all those it could – and should – benefit.
- Full Text:
- Date Issued: 2019
Green skills research in South Africa
- Authors: Rosenberg, Eureta , Ramsarup, Preesha , Lotz-Sisitka, Heila
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/436040 , vital:73222 , ISBN 9780429279362 , https://www.taylorfrancis.com/chapters/edit/10.4324/9780429279362-13/synthesis-elaboration-critical-realist-methodology-green-skills-research-eureta-rosenberg
- Description: This book brings the diverse contributions offered in the different sections of this book together into a pathway for new policy development research, new forms of critical skills research and ongoing engagement with education and training system development. The chapter first provides a meta-reflection on the different types of green skills research that are needed to, in combination, make a stronger impact on the national system of skills research and planning. Secondly, the chapter makes a strong argument for aligning green skills research to the Sustainable Development Goals, and their critical and contextual articulation at national level, with emphasis on working with the cross-cutting Sustainable Development Goal (SDG) 4, Target 4.7 that motivates for governments to include a focus on education and sustainable development across the lifelong learning system in order to enable and support learning and skills for enabling the other SDGs to be realised in practice. Lastly, the chapter considers the shift in the way that work is considered when political economy meets political ecology, and we argue that work transforms towards not only a productive focus, or a social focus, but also an ontologically grounded regenerative focus, much needed at the start of the twenty-first century.
- Full Text:
- Date Issued: 2019
Green skills research: Implications for systems, policy, work and learning
- Authors: Lotz-Sisitka, Heila , Ramsarup, Presha
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/392875 , vital:68808 , ISBN 9780429279362 , https://doi.org/10.4324/9780429279362
- Description: This chapter brings the diverse contributions offered in the different sections of this book together into a pathway for new policy development research, new forms of critical skills research and ongoing engagement with education and training system development. The chapter first provides a meta-reflection on the different types of green skills research that are needed to, in combination, make a stronger impact on the national system of skills research and planning. Secondly, the chapter makes a strong argument for aligning green skills research to the Sustainable Development Goals, and their critical and contextual articulation at national level, with emphasis on working with the cross-cutting Sustainable Development Goal (SDG) 4, Target 4.7 that motivates for governments to include a focus on education and sustainable development across the lifelong learning system in order to enable and support learning and skills for enabling the other SDGs to be realised in practice. Lastly, the chapter considers the shift in the way that work is considered when political economy meets political ecology, and we argue that work transforms towards not only a productive focus, or a social focus, but also an ontologically grounded regenerative focus, much needed at the start of the twenty-first century.
- Full Text:
- Date Issued: 2019
Green skills supply: Research from providers’ vantage point (s)
- Authors: Lotz-Sisitka, Heila
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/436051 , vital:73223 , ISBN 9780429279362 , https://www.taylorfrancis.com/chapters/edit/10.4324/9780429279362-13/synthesis-elaboration-critical-realist-methodology-green-skills-research-eureta-rosenberg
- Description: This chapter emerges from a need to consider the dynamics of supply side research for green skills from a providers’ vantage point. The chapter starts with the argument that environment and sustainability skills are cross institutional, cross sectoral and also inter- and transdisciplinary. The chapter notes that there are a wide variety and diversity of supply side studies that can offer perspective on the many dynamics of green skills supply and provisioning. Four cases have been selected and brought into view to illuminate the influence of context and history on designing curricula and the importance of reflexive curriculum review studies, whole institution approaches and transformative, transgressive forms of learning that move beyond the boundaries of single institutions. These studies are also brought into view to indicate the scope and depth of contextual, systemic and engaged research that is required to develop transformative orientations and perspectives on green skills supply, taking skills system supply beyond the traditional training needs analysis. The chapter argues that this is an important dimension of green skills research, if conceptualised within just transitions and transformations to sustainability.
- Full Text:
- Date Issued: 2019
Green skills supply: Research from providers’ vantage point(s)
- Authors: Lotz-Sisitka, Heila
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/392895 , vital:68810 , ISBN 9780429279362 , https://doi.org/10.4324/9780429279362
- Description: This chapter emerges from a need to consider the dynamics of supply side research for green skills from a providers’ vantage point. The chapter starts with the argument that environment and sustainability skills are cross institutional, cross sectoral and also inter- and transdisciplinary. The chapter notes that there are a wide variety and diversity of supply side studies that can offer perspective on the many dynamics of green skills supply and provisioning. Four cases have been selected and brought into view to illuminate the influence of context and history on designing curricula and the importance of reflexive curriculum review studies, whole institution approaches and transformative, transgressive forms of learning that move beyond the boundaries of single institutions. These studies are also brought into view to indicate the scope and depth of contextual, systemic and engaged research that is required to develop transformative orientations and perspectives on green skills supply, taking skills system supply beyond the traditional training needs analysis. The chapter argues that this is an important dimension of green skills research, if conceptualised within just transitions and transformations to sustainability.
- Full Text:
- Date Issued: 2019
Green synthesis of zinc oxide nanoparticles using Solanum torvum (L) leaf extract and evaluation of the toxicological profile of the ZnO nanoparticles–hydrogel composite in Wistar albino rats
- Authors: Ezealisiji, Kenneth E , Siwe-Noundou, Xavier , Maduelosi, Blessing , Nwachukwu, Nkemakolam , Krause, Rui W M
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/194015 , vital:45416 , xlink:href="https://doi.org/10.1007/s40089-018-0263-1"
- Description: Current study reports a simple and one-pot synthesis of zinc oxide nanoparticles (ZnONPs) using an aqueous extract of Solanum torvum and evaluation of its toxicological profile (0.5% w/w and 1.0% w/w) in Wistar albino rats with respect to the biochemical index. The nanoparticles were characterized using ultraviolet–visible spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction technique. Dynamic light scattering (DLS) and zeta potential of synthesized nanoparticles were analyzed to know the average size and stability of particles. Synthesized nanoparticles were stable, discreet, and mostly spherical, and size of particles was within the nanometre range. Biochemical markers of hepatic and renal functions were measured. Zinc oxide nanoparticles significantly decreased serum uric acid level (p less than 0.001) in a dose-dependent manner, while the serum alkaline phosphatase level was increased at the two test doses. The level of alanine transaminase was increased after exposure for 28 days (p less than 0.05). This study concludes that biogenic zinc oxide nanoparticles-infused hydrogel applied dermatologically could affect hepatic and renal performance in rats, and there was an observed cumulative toxicological effect with time of exposure.
- Full Text:
- Date Issued: 2019
How to engage with challenges facing Water and Sanitation Services (WSS) in small municipalities
- Authors: Clifford-Holmes, Jai K , Carnohan, Shane , Slinger, Jill W , Palmer, Carolyn G
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , report
- Identifier: http://hdl.handle.net/10962/437869 , vital:73418 , ISBN 978-1 4312-0988-0 , https://wrcwebsite.azurewebsites.net/wp-content/uploads/mdocs/SP 120-18 web.pdf
- Description: Smaller South African municipalities have many urgent calls on their resources AT THE SAME TIME. • The need to pay salaries is sometimes more important than other concerns. • It is not always clear how different problems affect each other. • It is difficult to decide what to do each day. • There are always urgent crises to attend to. • There are many meetings to attend. • Operational and political priorities can be different. Thinking of, and talking about your municipality as a SYSTEM will help you to ACT in ways that reduce the impact of these issues. This handbook relates specifically to water and sanitation issues.
- Full Text:
- Date Issued: 2019
How to engage with coal mines through Catchment Management Forums
- Authors: Munnik, Victor , Holleman, Helen , Wolff, Margaret G , Palmer, Carolyn G
- Date: 2019
- Subjects: To be catalogued
- Language: English
- Type: text , report
- Identifier: http://hdl.handle.net/10962/437882 , vital:73419 , ISBN 978-1 4312-0990-3 , https://wrcwebsite.azurewebsites.net/wp-content/uploads/mdocs/SP 122-18 web.pdf
- Description: This book was written for the catchment management forum (CMF) in the Upper Komati Forum (UKF), and they share their experience in order to help other CMFs understand the damage coal mining does to our water resources. This booklet should be used with How to think and act in ways that make Adaptive IWRM practically possible and How to establish and run a Catchment Management Forum.
- Full Text:
- Date Issued: 2019