Rapid biological assessment of the fishery potential of Xonxa Dam, near Queenstown, South Africa
- Richardson, T J, Booth, Anthony J, Weyl, Olaf L F
- Authors: Richardson, T J , Booth, Anthony J , Weyl, Olaf L F
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125798 , vital:35818 , https://doi.10.2989/AJAS.2009.34.1.9.734
- Description: In Africa, the harvesting of fish from small reservoirs has been identified as an important food resource for small rural communities, particularly those living close to waterbodies (Kapetsky and Petr 1984, Marshall and Maes 1994, van der Knaap 1994). Development of fisheries to utilize these resources has recently been identified by the African Union as a priority investment area for poverty alleviation and regional economic development (NEPAD 2005). Within a South African context, it is suspected that there will be increased interest in developing these fisheries to address major national policy objectives, which include food security, economic empowerment, optimal economic benefit from water, and poverty eradication (RSA 1998a, 1998b). South Africa, however, presents a somewhat anomalous situation. The lack of a fishing history in communities, the lack of species with a high fisheries potential, inadequate inland fisheries policy and a lack of directed fisheries development have resulted in low utilisation levels of fish resources in South African reservoirs (Weyl et al. 2007).
- Full Text:
- Date Issued: 2009
- Authors: Richardson, T J , Booth, Anthony J , Weyl, Olaf L F
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/125798 , vital:35818 , https://doi.10.2989/AJAS.2009.34.1.9.734
- Description: In Africa, the harvesting of fish from small reservoirs has been identified as an important food resource for small rural communities, particularly those living close to waterbodies (Kapetsky and Petr 1984, Marshall and Maes 1994, van der Knaap 1994). Development of fisheries to utilize these resources has recently been identified by the African Union as a priority investment area for poverty alleviation and regional economic development (NEPAD 2005). Within a South African context, it is suspected that there will be increased interest in developing these fisheries to address major national policy objectives, which include food security, economic empowerment, optimal economic benefit from water, and poverty eradication (RSA 1998a, 1998b). South Africa, however, presents a somewhat anomalous situation. The lack of a fishing history in communities, the lack of species with a high fisheries potential, inadequate inland fisheries policy and a lack of directed fisheries development have resulted in low utilisation levels of fish resources in South African reservoirs (Weyl et al. 2007).
- Full Text:
- Date Issued: 2009
Rapid UPLC - MS/MS method for the determination of ketoprofen in human dermal microdialysis samples
- Tettey-Amlalo, Ralph N O, Kanfer, Isadore
- Authors: Tettey-Amlalo, Ralph N O , Kanfer, Isadore
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6444 , http://hdl.handle.net/10962/d1006631
- Description: Dermal microdialysis (DMD) is a technique capable of determining the percutaneous penetration of drugs from topical formulations intended for local and/or regional activity. Typically, the concentrations of drug collected in dialysates are very low, generally in the ng/ml or even pg/ml range. An additional challenge is the very low volume of sample collected at each collection time and which can range from 1 to 30 μl only. Hence the objective was to develop and validate a rapid, accurate, precise, reproducible and highly sensitive LC–MS/MS method for the quantitative analysis of ketoprofen (KET) in dialystes following application of a topical gel product to the skin of human subjects. UPLC–MS/MS was used and KET was separated on an Acquity™ UPLC BEH C18 column (100 mm × 2.1 mm i.d., 1.7 μm) and analysed in negative-ion (NI) electrospray ionisation (ESI) mode. The mobile phase (MP) consisted of acetonitrile:methanol:water (60:20:20, v/v/v) under isocratic conditions at a flow rate of 0.3 ml/min. Samples were extracted using ethyl acetate with ibuprofen (IBU) as internal standard (IS) and the organic solvent was then evaporated to dryness and the residue re-constituted in methanol. 5 μl samples were injected and analysis was performed at ambient temperature 22 ± 0.5 °C. KET and IBU eluted at 1.07 and 1.49 min, respectively. KET and IBU responses were optimised at the transitions 253.00 > 209.00 and 205.00 > 161.00, respectively. Calibration curves were linear over the range 0.5–500 ng/ml with correlation coefficients > 0.999. The accuracy and precision of the method were found to be between 99.97% and 104.67% (R.S.D. < 2%) and the mean recovery of KET from normal saline was 88.03 ± 0.3% (R.S.D. < 2.20%). The LLOQ and LOD values were found to be 0.5 and 0.1 ng/ml respectively whereas the ULOD was set at 500 ng/ml. The method was successfully applied to determine the bioavailability of KET following application of topical KET gel, Fastum® gel, to the skin of human volunteers.
- Full Text:
- Date Issued: 2009
- Authors: Tettey-Amlalo, Ralph N O , Kanfer, Isadore
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:6444 , http://hdl.handle.net/10962/d1006631
- Description: Dermal microdialysis (DMD) is a technique capable of determining the percutaneous penetration of drugs from topical formulations intended for local and/or regional activity. Typically, the concentrations of drug collected in dialysates are very low, generally in the ng/ml or even pg/ml range. An additional challenge is the very low volume of sample collected at each collection time and which can range from 1 to 30 μl only. Hence the objective was to develop and validate a rapid, accurate, precise, reproducible and highly sensitive LC–MS/MS method for the quantitative analysis of ketoprofen (KET) in dialystes following application of a topical gel product to the skin of human subjects. UPLC–MS/MS was used and KET was separated on an Acquity™ UPLC BEH C18 column (100 mm × 2.1 mm i.d., 1.7 μm) and analysed in negative-ion (NI) electrospray ionisation (ESI) mode. The mobile phase (MP) consisted of acetonitrile:methanol:water (60:20:20, v/v/v) under isocratic conditions at a flow rate of 0.3 ml/min. Samples were extracted using ethyl acetate with ibuprofen (IBU) as internal standard (IS) and the organic solvent was then evaporated to dryness and the residue re-constituted in methanol. 5 μl samples were injected and analysis was performed at ambient temperature 22 ± 0.5 °C. KET and IBU eluted at 1.07 and 1.49 min, respectively. KET and IBU responses were optimised at the transitions 253.00 > 209.00 and 205.00 > 161.00, respectively. Calibration curves were linear over the range 0.5–500 ng/ml with correlation coefficients > 0.999. The accuracy and precision of the method were found to be between 99.97% and 104.67% (R.S.D. < 2%) and the mean recovery of KET from normal saline was 88.03 ± 0.3% (R.S.D. < 2.20%). The LLOQ and LOD values were found to be 0.5 and 0.1 ng/ml respectively whereas the ULOD was set at 500 ng/ml. The method was successfully applied to determine the bioavailability of KET following application of topical KET gel, Fastum® gel, to the skin of human volunteers.
- Full Text:
- Date Issued: 2009
Reflections on the sine causa requirements and the condictiones in South African law
- Authors: Glover, Graham B
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70668 , vital:29687 , https://hdl.handle.net/10520/EJC54716
- Description: The condictiones present interesting and difficult challenges of classification for the modern South African jurist. Their casuistic development has made them difficult to work with, and for a long time it was argued that a single general enrichment action should take their place. But the Supreme Court of Appeal in McCarthy Retail Ltd v Shortdistance Carriers CC 2001 3 SA 482 (SCA) chose not to follow this path, and instead preferred the idea that a general enrichment action should be subsidiary to the traditional actions. This has breathed new life into debates on the future of the condictiones. This article first examines the current range of application of the condictiones. It then proceeds to show how the courts in the first decade of the 21st century seem to have eschewed the technicalities inherent in pleading the condictiones, and have preferred rather to resolve cases by applying the general requirements of enrichment liability, in contrast to the injunction in McCarthy. The difficulty with this approach is the lack of substance that is given to the sine causa requirement. The article proceeds to examine the various theories about how we in South Africa should understand and give content to the sine causa requirement. This provides a springboard for considering the possible futures of the condictiones. Broadly, it seems that two options are possible: either to collapse the condictiones into one action to deal with cases of enrichment by transfer; or largely to retain the status quo. The most recent decisions of the Supreme Court of Appeal indicate that the latter, more conservative option is likely to be chosen in the short-term. If this approach is to be adopted, it will require a further review of how each of the constituent condictiones fulfils a particular function. A revisionist view of the condictio indebiti is postulated by way of example.
- Full Text: false
- Date Issued: 2009
- Authors: Glover, Graham B
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70668 , vital:29687 , https://hdl.handle.net/10520/EJC54716
- Description: The condictiones present interesting and difficult challenges of classification for the modern South African jurist. Their casuistic development has made them difficult to work with, and for a long time it was argued that a single general enrichment action should take their place. But the Supreme Court of Appeal in McCarthy Retail Ltd v Shortdistance Carriers CC 2001 3 SA 482 (SCA) chose not to follow this path, and instead preferred the idea that a general enrichment action should be subsidiary to the traditional actions. This has breathed new life into debates on the future of the condictiones. This article first examines the current range of application of the condictiones. It then proceeds to show how the courts in the first decade of the 21st century seem to have eschewed the technicalities inherent in pleading the condictiones, and have preferred rather to resolve cases by applying the general requirements of enrichment liability, in contrast to the injunction in McCarthy. The difficulty with this approach is the lack of substance that is given to the sine causa requirement. The article proceeds to examine the various theories about how we in South Africa should understand and give content to the sine causa requirement. This provides a springboard for considering the possible futures of the condictiones. Broadly, it seems that two options are possible: either to collapse the condictiones into one action to deal with cases of enrichment by transfer; or largely to retain the status quo. The most recent decisions of the Supreme Court of Appeal indicate that the latter, more conservative option is likely to be chosen in the short-term. If this approach is to be adopted, it will require a further review of how each of the constituent condictiones fulfils a particular function. A revisionist view of the condictio indebiti is postulated by way of example.
- Full Text: false
- Date Issued: 2009
Reform in defence of sovereignty: South Africa in the UN Security Council, 2007–2008
- Authors: Bischoff, Paul, 1954-
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161431 , vital:40626 , https://0-doi.org.wam.seals.ac.za/10.1177/000203970904400205
- Description: After 1994, South Africa became the sine qua non of an internationalist state, willing to promote cooperation amongst a plurality of actors, believing common interests to be more important than their differences. This raised the hopes of constitutionalists, and those who believed in the expansion of a liberal democratic peace. South Africa has acted out two seemingly contradictory roles: those of a reformer and those of a conserver. By 2007–2008 she had shifted towards the latter, conservative-reformist position. Thus, South Africa's voting record at the General Assembly expressed her overriding concern to regionalise African issues and minimise the US and the West shaping political events. This brought her foreign policy into sharper relief. But while in some sense successful, it came at a price: a controversy about her surrendering her internationalism and principles on human rights for African unity and traditional sovereignty. But it also marked the arrival of South Africa in the world of international Realpolitik.
- Full Text:
- Date Issued: 2009
- Authors: Bischoff, Paul, 1954-
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161431 , vital:40626 , https://0-doi.org.wam.seals.ac.za/10.1177/000203970904400205
- Description: After 1994, South Africa became the sine qua non of an internationalist state, willing to promote cooperation amongst a plurality of actors, believing common interests to be more important than their differences. This raised the hopes of constitutionalists, and those who believed in the expansion of a liberal democratic peace. South Africa has acted out two seemingly contradictory roles: those of a reformer and those of a conserver. By 2007–2008 she had shifted towards the latter, conservative-reformist position. Thus, South Africa's voting record at the General Assembly expressed her overriding concern to regionalise African issues and minimise the US and the West shaping political events. This brought her foreign policy into sharper relief. But while in some sense successful, it came at a price: a controversy about her surrendering her internationalism and principles on human rights for African unity and traditional sovereignty. But it also marked the arrival of South Africa in the world of international Realpolitik.
- Full Text:
- Date Issued: 2009
Review of South African research and interventions in the development of a policy strategy on teen-aged pregnancy
- Macleod, Catriona I, Tracey, Tiffany
- Authors: Macleod, Catriona I , Tracey, Tiffany
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , review
- Identifier: http://hdl.handle.net/10962/434425 , vital:73058 , ISBN review , https://www.researchgate.net/profile/Catriona-Macleod-3/publication/43108043_Review_of_South_African_Research_and_Interventions_in_the_Development_of_a_Policy_Strategy_on_Teen-Aged_Pregnancy/links/0c960539ff3f3595e6000000/Review-of-South-African-Research-and-Interventions-in-the-Development-of-a-Policy-Strategy-on-Teen-Aged-Pregnancy.pdf
- Description: In line with international trends, current South African policy and plans identify sexual and reproductive health as a key priority area for health intervention. Both the prevention of unwanted pregnancies amongst teenagers and the provision of support to those who do conceive contribute to the overall aim of enhancing reproductive health. This report represents a first step in the review of youth and adolescent health policy with regards to pregnancy amongst teenagers. It consists of a review of the scientific literature published in the last 10 years supplemented by information gathered in interviews with key informants from a range of key directorates and organisations. Two broad principles frame this report. The first is the adoption of a nuanced and criti cal approach to understanding ‘adolescent pregnancy’ in context. The second is the adoption of a human rights based perspective that underlies much of South Africa’s legislation and policy with respect to youth sexuality and reproduction.
- Full Text:
- Date Issued: 2009
- Authors: Macleod, Catriona I , Tracey, Tiffany
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , review
- Identifier: http://hdl.handle.net/10962/434425 , vital:73058 , ISBN review , https://www.researchgate.net/profile/Catriona-Macleod-3/publication/43108043_Review_of_South_African_Research_and_Interventions_in_the_Development_of_a_Policy_Strategy_on_Teen-Aged_Pregnancy/links/0c960539ff3f3595e6000000/Review-of-South-African-Research-and-Interventions-in-the-Development-of-a-Policy-Strategy-on-Teen-Aged-Pregnancy.pdf
- Description: In line with international trends, current South African policy and plans identify sexual and reproductive health as a key priority area for health intervention. Both the prevention of unwanted pregnancies amongst teenagers and the provision of support to those who do conceive contribute to the overall aim of enhancing reproductive health. This report represents a first step in the review of youth and adolescent health policy with regards to pregnancy amongst teenagers. It consists of a review of the scientific literature published in the last 10 years supplemented by information gathered in interviews with key informants from a range of key directorates and organisations. Two broad principles frame this report. The first is the adoption of a nuanced and criti cal approach to understanding ‘adolescent pregnancy’ in context. The second is the adoption of a human rights based perspective that underlies much of South Africa’s legislation and policy with respect to youth sexuality and reproduction.
- Full Text:
- Date Issued: 2009
Reviews: Unsettling Questions: Palestine, Israel, the Holy Land and Zion
- Stähler, A, Vice, S, Brauner, D, Bassi, S, Naidu, Samantha, King, B, O'Neal, G S, Aldama, F L, Gibbs, J, Rotstein, J R U, Calderaro, M A
- Authors: Stähler, A , Vice, S , Brauner, D , Bassi, S , Naidu, Samantha , King, B , O'Neal, G S , Aldama, F L , Gibbs, J , Rotstein, J R U , Calderaro, M A
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157948 , vital:40133 , https://doi.org/10.1080/02690050802589479
- Description: Reviews: Unsettling Questions: Palestine, Israel, the Holy Land and Zion
- Full Text:
- Date Issued: 2009
- Authors: Stähler, A , Vice, S , Brauner, D , Bassi, S , Naidu, Samantha , King, B , O'Neal, G S , Aldama, F L , Gibbs, J , Rotstein, J R U , Calderaro, M A
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157948 , vital:40133 , https://doi.org/10.1080/02690050802589479
- Description: Reviews: Unsettling Questions: Palestine, Israel, the Holy Land and Zion
- Full Text:
- Date Issued: 2009
Rhodes University 2009 Graduation Ceremonies Address
- Authors: Badat, Saleem
- Date: 2009
- Language: English
- Type: text
- Identifier: vital:7585 , http://hdl.handle.net/10962/d1006575
- Description: From introduction: To be awarded a degree or diploma from Rhodes University entails dedicated endeavour. When you joined us you were told that at Rhodes learning and education is a partnership, a relationship of mutual commitment to the pursuit of knowledge and understanding, to the development of expertise and skills, and to the embrace of appropriate values and attitudes. Your graduation is testimony that you have fulfilled your side of the partnership. You have displayed the necessary commitment and willingness to learn, to acquire knowledge and to develop expertise. Your achievement, the fruits of many months and years of toil, is,ultimately, your own great accomplishment.
- Full Text:
- Date Issued: 2009
- Authors: Badat, Saleem
- Date: 2009
- Language: English
- Type: text
- Identifier: vital:7585 , http://hdl.handle.net/10962/d1006575
- Description: From introduction: To be awarded a degree or diploma from Rhodes University entails dedicated endeavour. When you joined us you were told that at Rhodes learning and education is a partnership, a relationship of mutual commitment to the pursuit of knowledge and understanding, to the development of expertise and skills, and to the embrace of appropriate values and attitudes. Your graduation is testimony that you have fulfilled your side of the partnership. You have displayed the necessary commitment and willingness to learn, to acquire knowledge and to develop expertise. Your achievement, the fruits of many months and years of toil, is,ultimately, your own great accomplishment.
- Full Text:
- Date Issued: 2009
Rhodes University Graduation Ceremony 2009
- Authors: Rhodes University
- Date: 2009
- Language: English
- Type: text
- Identifier: vital:8138 , http://hdl.handle.net/10962/d1007250
- Description: Rhodes University Graduation Ceremonies [at] 1820 Settlers National Monument Thursday, 16 April at 18:00 [and] Friday, 17 April at 10:30; 14:30 & 18:00 [and] Saturday, 18 April at 10:30
- Full Text:
- Date Issued: 2009
- Authors: Rhodes University
- Date: 2009
- Language: English
- Type: text
- Identifier: vital:8138 , http://hdl.handle.net/10962/d1007250
- Description: Rhodes University Graduation Ceremonies [at] 1820 Settlers National Monument Thursday, 16 April at 18:00 [and] Friday, 17 April at 10:30; 14:30 & 18:00 [and] Saturday, 18 April at 10:30
- Full Text:
- Date Issued: 2009
Rhodes University Library Annual Report 2009: Library Director’s Review
- Authors: Thomas, G M E
- Date: 2009
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/59941 , vital:27713
- Description: [From the Introduction] As you read through this annual overview of the work carried out by the staff of the Rhodes University Library Services Division, I am sure you will be impressed by their achievements during a year marked by major building construction and a demanding institutional review of our services and staffing structures.
- Full Text:
- Date Issued: 2009
- Authors: Thomas, G M E
- Date: 2009
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/59941 , vital:27713
- Description: [From the Introduction] As you read through this annual overview of the work carried out by the staff of the Rhodes University Library Services Division, I am sure you will be impressed by their achievements during a year marked by major building construction and a demanding institutional review of our services and staffing structures.
- Full Text:
- Date Issued: 2009
Rich Representation and Visualisation of Time-Series Data
- Kerr, Simon, Foster, Greg, Irwin, Barry V W
- Authors: Kerr, Simon , Foster, Greg , Irwin, Barry V W
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428130 , vital:72488 , https://www.researchgate.net/profile/Barry-Ir-win/publication/265821926_Rich_Representation_and_Visualisation_of_Time-Series_Data/links/5548a1350cf26a7bf4daefb1/Rich-Representation-and-Visualisation-of-Time-Series-Data.pdf
- Description: Currently the majority of data is visualized using static graphs and ta-bles. However, static graphs still leave much to be desired and provide only a small insight into trends and changes between values. We pro-pose a move away from purely static representations of data towards a more fluid and understandable environment for data representation. This is achieved through the use of an application which animates time based data. Animating time based data allows one to see nuances within a dataset from a more comprehensive perspective. This is espe-cially useful within the time based data rich telecommunications indus-try. The application comprises of two parts-the backend manages raw data which is then passed to the frontend for animation. A play function allows one to play through a time series. Which creates a fluid and dy-namic environment for exploring data. Both the advantages and disad-vantages of this approach are investigated and an application is intro-duced which can be used to animate and explore datasets.
- Full Text:
- Date Issued: 2009
- Authors: Kerr, Simon , Foster, Greg , Irwin, Barry V W
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428130 , vital:72488 , https://www.researchgate.net/profile/Barry-Ir-win/publication/265821926_Rich_Representation_and_Visualisation_of_Time-Series_Data/links/5548a1350cf26a7bf4daefb1/Rich-Representation-and-Visualisation-of-Time-Series-Data.pdf
- Description: Currently the majority of data is visualized using static graphs and ta-bles. However, static graphs still leave much to be desired and provide only a small insight into trends and changes between values. We pro-pose a move away from purely static representations of data towards a more fluid and understandable environment for data representation. This is achieved through the use of an application which animates time based data. Animating time based data allows one to see nuances within a dataset from a more comprehensive perspective. This is espe-cially useful within the time based data rich telecommunications indus-try. The application comprises of two parts-the backend manages raw data which is then passed to the frontend for animation. A play function allows one to play through a time series. Which creates a fluid and dy-namic environment for exploring data. Both the advantages and disad-vantages of this approach are investigated and an application is intro-duced which can be used to animate and explore datasets.
- Full Text:
- Date Issued: 2009
SDF-1 and PDGF enhance αvβ5-mediated ERK activation and adhesion-independent growth of human pre-B cell lines:
- Acharya, Mridu, Edkins, Adrienne L, Ozanne, B, Cushley, W
- Authors: Acharya, Mridu , Edkins, Adrienne L , Ozanne, B , Cushley, W
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/165044 , vital:41204 , DOI: 10.1038/leu.2009.126
- Description: CD23 acts through the αvβ5 integrin to promote growth of human pre-B cell lines in an adhesion-independent manner. αvβ5 is expressed on normal B-cell precursors in the bone marrow. Soluble CD23 (sCD23), short CD23-derived peptides containing the arg-lys-cys (RKC) motif recognized by αvβ5 and anti-αvβ5 monoclonal antibodies (MAbs) all sustain growth of pre-B cell lines. The chemokine stromal cell-derived factor-1 (SDF-1) regulates key processes during B-cell development. SDF-1 enhanced the growth-sustaining effect driven by ligation of αvβ5 with anti-αvβ5 MAb 15F-11, sCD23 or CD23-derived RKC-containing peptides. This effect was restricted to B-cell precursors and was specific to SDF-1.
- Full Text:
- Date Issued: 2009
- Authors: Acharya, Mridu , Edkins, Adrienne L , Ozanne, B , Cushley, W
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/165044 , vital:41204 , DOI: 10.1038/leu.2009.126
- Description: CD23 acts through the αvβ5 integrin to promote growth of human pre-B cell lines in an adhesion-independent manner. αvβ5 is expressed on normal B-cell precursors in the bone marrow. Soluble CD23 (sCD23), short CD23-derived peptides containing the arg-lys-cys (RKC) motif recognized by αvβ5 and anti-αvβ5 monoclonal antibodies (MAbs) all sustain growth of pre-B cell lines. The chemokine stromal cell-derived factor-1 (SDF-1) regulates key processes during B-cell development. SDF-1 enhanced the growth-sustaining effect driven by ligation of αvβ5 with anti-αvβ5 MAb 15F-11, sCD23 or CD23-derived RKC-containing peptides. This effect was restricted to B-cell precursors and was specific to SDF-1.
- Full Text:
- Date Issued: 2009
Seeing is natural, but viewing is not: teaching visual literacy in a rural classroom
- Mbelani, Madeyandile, Murray, Sarah R
- Authors: Mbelani, Madeyandile , Murray, Sarah R
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:7022 , http://hdl.handle.net/10962/d1007203
- Description: This paper reports on a collaborative action research case study into Grade 10 teaching and learning of visual literacy in a rural high school into the Eastern Cape, South Africa. Visual literacy is a new aspect that has been incorporated in English First Additional Language National Curriculum Statement (Grade 10-12), which has been implemented in Grade 10 from 2006. With the aim of gaining knowledge and improving performance in visual literacy, I designed a unit of lessons, which exposed learners to visual grammar and visual texts and I collected data around the implementation of the lesson unit as evidenced by journal writing, interviews and non-participant observation. The data revealed that visual literacy could be taught meaningfully in a rural high school as the learners could identify, cut, paste and critically discuss elements of visual language and they finally designed their own advertisements in groups. However, the following factors emerged as hindrances to the successful teaching of visual literacy in this case: lack of resources; learners' lack of a foundation in visual literacy from Grades 7-9; and problems revolving around time management and pacing.
- Full Text:
- Date Issued: 2009
- Authors: Mbelani, Madeyandile , Murray, Sarah R
- Date: 2009
- Language: English
- Type: text , Article
- Identifier: vital:7022 , http://hdl.handle.net/10962/d1007203
- Description: This paper reports on a collaborative action research case study into Grade 10 teaching and learning of visual literacy in a rural high school into the Eastern Cape, South Africa. Visual literacy is a new aspect that has been incorporated in English First Additional Language National Curriculum Statement (Grade 10-12), which has been implemented in Grade 10 from 2006. With the aim of gaining knowledge and improving performance in visual literacy, I designed a unit of lessons, which exposed learners to visual grammar and visual texts and I collected data around the implementation of the lesson unit as evidenced by journal writing, interviews and non-participant observation. The data revealed that visual literacy could be taught meaningfully in a rural high school as the learners could identify, cut, paste and critically discuss elements of visual language and they finally designed their own advertisements in groups. However, the following factors emerged as hindrances to the successful teaching of visual literacy in this case: lack of resources; learners' lack of a foundation in visual literacy from Grades 7-9; and problems revolving around time management and pacing.
- Full Text:
- Date Issued: 2009
Sigtuna think piece 6: A case of exploring learning interactions in rural farming communities of practice in Manicaland, Zimbabwe
- Authors: Pesanayi, Tichaona V
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386427 , vital:68140 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122802"
- Description: Food insecurity is one of the major threats to sustainable development in Africa, and particularly southern Africa. Climate change is increasingly having negative impacts on food production, further increasing the vulnerability of resource-poor communities. This paper outlines a research study conducted in two Zimbabwean smallholder communities of practice, with the aim of understanding learning interactions taking place within the community of practice that influence its choice of cultivated food plants. This would hopefully inform capability-centred teaching and learning. The study was conducted in the context of vulnerability to environment risk, socio-political pressures and a market-oriented agro-based economy in recession. Various causal mechanisms influencing plant-food choice were identified using critical realist ontological analysis. These included mixed messages from external influences in conflict with local knowledge due to power knowledge relationships. A number of learning interactions were found to be important in promoting the adaptive capacity of the farmers to chronic drought, which included inter-generational knowledge sharing; farmer to farmer exchange and reflective dialogue; experiential learning; farmers ‘passing on’ part of their harvests to other farmers; farming communities learning from risk and responding to risk; and learning from trying things out. The implications for capability-centred social learning processes were that it is important to understand the causal mechanisms that influence choices; and to confront tensions, while reducing ambivalence. A focus on more sustainable alternatives, feasible and practical for farmers, was recommended. These findings, in the context of one case study, create research questions to be examined in other case contexts in environmental education research focusing on climate change learning and adaptation.
- Full Text:
- Date Issued: 2009
- Authors: Pesanayi, Tichaona V
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386427 , vital:68140 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122802"
- Description: Food insecurity is one of the major threats to sustainable development in Africa, and particularly southern Africa. Climate change is increasingly having negative impacts on food production, further increasing the vulnerability of resource-poor communities. This paper outlines a research study conducted in two Zimbabwean smallholder communities of practice, with the aim of understanding learning interactions taking place within the community of practice that influence its choice of cultivated food plants. This would hopefully inform capability-centred teaching and learning. The study was conducted in the context of vulnerability to environment risk, socio-political pressures and a market-oriented agro-based economy in recession. Various causal mechanisms influencing plant-food choice were identified using critical realist ontological analysis. These included mixed messages from external influences in conflict with local knowledge due to power knowledge relationships. A number of learning interactions were found to be important in promoting the adaptive capacity of the farmers to chronic drought, which included inter-generational knowledge sharing; farmer to farmer exchange and reflective dialogue; experiential learning; farmers ‘passing on’ part of their harvests to other farmers; farming communities learning from risk and responding to risk; and learning from trying things out. The implications for capability-centred social learning processes were that it is important to understand the causal mechanisms that influence choices; and to confront tensions, while reducing ambivalence. A focus on more sustainable alternatives, feasible and practical for farmers, was recommended. These findings, in the context of one case study, create research questions to be examined in other case contexts in environmental education research focusing on climate change learning and adaptation.
- Full Text:
- Date Issued: 2009
Sigtuna Think Piece 8: Piecing together conceptual framings for climate change education research in southern African contexts
- Authors: Lotz-Sisitka, Heila
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67378 , vital:29082 , https://www.ajol.info/index.php/sajee/article/view/122808
- Description: publisher version , This think piece considers a range of theoretical and conceptual tools that may assist with the emergence of a research agenda for climate change in education. It considers the conditions that are created by climate change in and for southern African contexts, and then deliberates which contextually related theoretical tools may be useful to frame research questions for climate change education. I consider the educational research implications of adaptation practices, reflexive justice and agency, reflexivity and capability, noting that a climate change education research agenda, not different to a wider reflexive environmental education research agenda dealing with transformative praxis in southern Africa, is essentially a sociologically and historically emergent ‘researching with’ agenda, and is in effect a social learning process. In putting together these conceptual framings for a climate change research agenda in southern Africa, I am interested in exploring how participatory social learning research may strengthen agency and reflexivity (development of capabilities) in response to socio-ecological conditions.
- Full Text:
- Date Issued: 2009
- Authors: Lotz-Sisitka, Heila
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/67378 , vital:29082 , https://www.ajol.info/index.php/sajee/article/view/122808
- Description: publisher version , This think piece considers a range of theoretical and conceptual tools that may assist with the emergence of a research agenda for climate change in education. It considers the conditions that are created by climate change in and for southern African contexts, and then deliberates which contextually related theoretical tools may be useful to frame research questions for climate change education. I consider the educational research implications of adaptation practices, reflexive justice and agency, reflexivity and capability, noting that a climate change education research agenda, not different to a wider reflexive environmental education research agenda dealing with transformative praxis in southern Africa, is essentially a sociologically and historically emergent ‘researching with’ agenda, and is in effect a social learning process. In putting together these conceptual framings for a climate change research agenda in southern Africa, I am interested in exploring how participatory social learning research may strengthen agency and reflexivity (development of capabilities) in response to socio-ecological conditions.
- Full Text:
- Date Issued: 2009
Simulating crowd phenomena in african markets
- Tasse, Flora P, Glass, Kevin R, Bangay, Shaun D
- Authors: Tasse, Flora P , Glass, Kevin R , Bangay, Shaun D
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/433285 , vital:72959 , https://doi.org/10.1145/1503454.1503463
- Description: Crowd simulation is an important feature in the computer graphics field. Typical implementations simulate battle scenes, emergency situations, safety issues or add content to virtual environments. The problem stated in this paper falls in the last category. We present a crowd simulation behavioural model which allows us to simulate identified phenomena in popular local African markets such as narrow street flows and crowd formation around street performances. We propose a three-tier architecture model enable to produce intentions, perform path planning and control movement. We demonstrate that this approach produces the desired behaviour associated with crowds in an African market, which includes navigation, flow formation and circle creation.
- Full Text:
- Date Issued: 2009
- Authors: Tasse, Flora P , Glass, Kevin R , Bangay, Shaun D
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/433285 , vital:72959 , https://doi.org/10.1145/1503454.1503463
- Description: Crowd simulation is an important feature in the computer graphics field. Typical implementations simulate battle scenes, emergency situations, safety issues or add content to virtual environments. The problem stated in this paper falls in the last category. We present a crowd simulation behavioural model which allows us to simulate identified phenomena in popular local African markets such as narrow street flows and crowd formation around street performances. We propose a three-tier architecture model enable to produce intentions, perform path planning and control movement. We demonstrate that this approach produces the desired behaviour associated with crowds in an African market, which includes navigation, flow formation and circle creation.
- Full Text:
- Date Issued: 2009
Solvent and central metal effects on the photophysical and photochemical properties of peripherally tetra mercaptopyridine substituted metallophthalocyanines
- Moeno, Sharon, Nyokong, Tebello
- Authors: Moeno, Sharon , Nyokong, Tebello
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/263522 , vital:53635 , xlink:href="https://doi.org/10.1016/j.jphotochem.2009.01.021"
- Description: The synthesis of peripherally tetra 2-mercaptopyridine substituted phthalocyanines containing Si, Ga, Sn and In as central metal ions is reported for the first time in this study. Photophysical and photochemical studies were carried out on these compounds in order to determine the potential of the complexes as photosensitizers for use in photodynamic therapy. Fluorescence quantum yields (ΦF) ranged from 0.012 to 0.2 and triplet quantum yields (ΦT) from 0.54 to 0.89 in dimethylformamide (DMF) and from 0.65 to 0.93 in dimethylsulfoxide (DMSO). The triplet lifetimes ranged from 20 to 130 μs, the low values are due to the heavy atom effects of the central metal. The triplet lifetimes were larger in DMSO when compared with DMF.
- Full Text:
- Date Issued: 2009
- Authors: Moeno, Sharon , Nyokong, Tebello
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/263522 , vital:53635 , xlink:href="https://doi.org/10.1016/j.jphotochem.2009.01.021"
- Description: The synthesis of peripherally tetra 2-mercaptopyridine substituted phthalocyanines containing Si, Ga, Sn and In as central metal ions is reported for the first time in this study. Photophysical and photochemical studies were carried out on these compounds in order to determine the potential of the complexes as photosensitizers for use in photodynamic therapy. Fluorescence quantum yields (ΦF) ranged from 0.012 to 0.2 and triplet quantum yields (ΦT) from 0.54 to 0.89 in dimethylformamide (DMF) and from 0.65 to 0.93 in dimethylsulfoxide (DMSO). The triplet lifetimes ranged from 20 to 130 μs, the low values are due to the heavy atom effects of the central metal. The triplet lifetimes were larger in DMSO when compared with DMF.
- Full Text:
- Date Issued: 2009
Some (more) features of conversation amongst women friends:
- Authors: Hunt, Sally
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/139149 , vital:37709 , DOI: 10.2989/16073610509486400
- Description: This paper provides an analysis of a conversation between young women friends, which is analysed in terms of Coates’ (1988; 1997; 1999) work on the features of conversation amongst female friends. Coates identifies a number of features which, she says, are typical of conversation between (adult) female friends: a domestic setting, female participants, topics relating to people and feelings, and various formal features including smooth topic development, frequent minimal responses, supportive forms of simultaneous speech and epistemic modality (‘softening’ strategies, including tag questions) (Coates, 1988: 97). The overarching function, she claims, is one of solidarity-building and support: ‘the maintenance of good social relationships’ and ‘the reaffirming and strengthening of friendship’ (Coates, 1988: 98). While this last feature, the function of conversation between women friends, is borne out by the extract to be analysed, the participants in my study utilise different strategies to accomplish it and, in several respects, do not utilise the other features Coates claims to be typical. The research shows, through a detailed analysis of a nineminute extract from a conversation between three women friends, that the features assumed by Coates to be central conversational strategies in the building of female friendship are not the only ways for women to accomplish this function.
- Full Text:
- Date Issued: 2009
- Authors: Hunt, Sally
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/139149 , vital:37709 , DOI: 10.2989/16073610509486400
- Description: This paper provides an analysis of a conversation between young women friends, which is analysed in terms of Coates’ (1988; 1997; 1999) work on the features of conversation amongst female friends. Coates identifies a number of features which, she says, are typical of conversation between (adult) female friends: a domestic setting, female participants, topics relating to people and feelings, and various formal features including smooth topic development, frequent minimal responses, supportive forms of simultaneous speech and epistemic modality (‘softening’ strategies, including tag questions) (Coates, 1988: 97). The overarching function, she claims, is one of solidarity-building and support: ‘the maintenance of good social relationships’ and ‘the reaffirming and strengthening of friendship’ (Coates, 1988: 98). While this last feature, the function of conversation between women friends, is borne out by the extract to be analysed, the participants in my study utilise different strategies to accomplish it and, in several respects, do not utilise the other features Coates claims to be typical. The research shows, through a detailed analysis of a nineminute extract from a conversation between three women friends, that the features assumed by Coates to be central conversational strategies in the building of female friendship are not the only ways for women to accomplish this function.
- Full Text:
- Date Issued: 2009
South Africa: Applied competence as the guiding framework for environmental and sustainability education
- Lotz-Sisitka, Heila, Raven, Glenda
- Authors: Lotz-Sisitka, Heila , Raven, Glenda
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/437395 , vital:73375 , ISBN 978-1-4020-8194-1 , https://doi.org/10.1007/978-1-4020-8194-1_22
- Description: Following the demise of apartheid rule in South Africa in 1994, the new government adopted the South African Qualifications Act (RSA, 1995a) which established the South African Qualifications Authority (SAQA). The SAQA was tasked with the responsibility for developing and im-plementing a national qualifications framework (NQF) based on princi-ples of quality, equity and redress. A primary objective of the NQF was to establish a portable and responsive model for lifelong learning and one which could recognize prior learning according to an outcomes-based education and training framework. In addition to this mandate and amongst other responsibilities, SAQA has had a responsibility to design and develop qualifications that respond to the environmental rights and sustainable development clauses of the Constitution and as-sociated national policies. Through this, environment and sustainability education was placed on the national education and training agenda (see Lotz-Sisitka and Olvitt in this volume).
- Full Text:
- Date Issued: 2009
- Authors: Lotz-Sisitka, Heila , Raven, Glenda
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/437395 , vital:73375 , ISBN 978-1-4020-8194-1 , https://doi.org/10.1007/978-1-4020-8194-1_22
- Description: Following the demise of apartheid rule in South Africa in 1994, the new government adopted the South African Qualifications Act (RSA, 1995a) which established the South African Qualifications Authority (SAQA). The SAQA was tasked with the responsibility for developing and im-plementing a national qualifications framework (NQF) based on princi-ples of quality, equity and redress. A primary objective of the NQF was to establish a portable and responsive model for lifelong learning and one which could recognize prior learning according to an outcomes-based education and training framework. In addition to this mandate and amongst other responsibilities, SAQA has had a responsibility to design and develop qualifications that respond to the environmental rights and sustainable development clauses of the Constitution and as-sociated national policies. Through this, environment and sustainability education was placed on the national education and training agenda (see Lotz-Sisitka and Olvitt in this volume).
- Full Text:
- Date Issued: 2009
South Africa: Strengthening responses to sustainable development policy and legislation
- Lotz-Sisitka, Heila, Olvitt, Lausanne L
- Authors: Lotz-Sisitka, Heila , Olvitt, Lausanne L
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/437382 , vital:73374 , ISBN 978-1-4020-8194-1 , https://doi.org/10.1007/978-1-4020-8194-1_23
- Description: A key objective of the newly established South African national qualifi-cations framework (NQF) is to enable the transformation of society, fol-lowing the demise of apartheid in 1994. Through the South African Constitution, which enshrines the right to a healthy environment for all citizens, and the sustainable utilization of resources for current and fu-ture generations (RSA, 1996), South African society adopted a devel-opment path that is oriented towards sustainable development. The de-velopment and implementation of the NQF (established by the South African Qualifications Authority Act in 1995) has involved various initia-tives to design and develop qualifications that respond to the environ-mental rights and sustainable development clauses of the Constitution and associated national policy. The past 10 years have been an active period for reconceptualizing education and training in South Africa, par-ticularly in the previously neglected1 area of workplacebased learning. New structures were put in place to develop and approve flexible and portable qualifications in unit-standard format, new service delivery structures and mechanisms have been established which allow for flex-ible forms of programme delivery and new learning programmes have been designed to respond to the outcomes-based, flexible format of the NQF. The NQF has created new opportunities for lifelong learning and new possibilities for those formerly disadvantaged by apartheid exclu-sionary policies and systems to gain access to education and training, and recognition for their skills and competencies. It has also created the space for new innovative programmes to emerge that respond to emerging issues in society, such as increased environmental degradation, increased health risks and new social and economic challenges.
- Full Text:
- Date Issued: 2009
- Authors: Lotz-Sisitka, Heila , Olvitt, Lausanne L
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , book chapter
- Identifier: http://hdl.handle.net/10962/437382 , vital:73374 , ISBN 978-1-4020-8194-1 , https://doi.org/10.1007/978-1-4020-8194-1_23
- Description: A key objective of the newly established South African national qualifi-cations framework (NQF) is to enable the transformation of society, fol-lowing the demise of apartheid in 1994. Through the South African Constitution, which enshrines the right to a healthy environment for all citizens, and the sustainable utilization of resources for current and fu-ture generations (RSA, 1996), South African society adopted a devel-opment path that is oriented towards sustainable development. The de-velopment and implementation of the NQF (established by the South African Qualifications Authority Act in 1995) has involved various initia-tives to design and develop qualifications that respond to the environ-mental rights and sustainable development clauses of the Constitution and associated national policy. The past 10 years have been an active period for reconceptualizing education and training in South Africa, par-ticularly in the previously neglected1 area of workplacebased learning. New structures were put in place to develop and approve flexible and portable qualifications in unit-standard format, new service delivery structures and mechanisms have been established which allow for flex-ible forms of programme delivery and new learning programmes have been designed to respond to the outcomes-based, flexible format of the NQF. The NQF has created new opportunities for lifelong learning and new possibilities for those formerly disadvantaged by apartheid exclu-sionary policies and systems to gain access to education and training, and recognition for their skills and competencies. It has also created the space for new innovative programmes to emerge that respond to emerging issues in society, such as increased environmental degradation, increased health risks and new social and economic challenges.
- Full Text:
- Date Issued: 2009
St. Petersburg
- Authors: Krueger, Anton
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229818 , vital:49713 , xlink:href="https://hdl.handle.net/10520/EJC47812"
- Full Text:
- Date Issued: 2009
- Authors: Krueger, Anton
- Date: 2009
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229818 , vital:49713 , xlink:href="https://hdl.handle.net/10520/EJC47812"
- Full Text:
- Date Issued: 2009