Weevil borne microbes contribute as much to the reduction of photosynthesis in water hyacinth as does herbivory
- Venter, Nic, Hill, Martin P, Hutchinson, Sarah-Leigh, Ripley, Brad S
- Authors: Venter, Nic , Hill, Martin P , Hutchinson, Sarah-Leigh , Ripley, Brad S
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/423573 , vital:72073 , xlink:href="https://doi.org/10.1016/j.biocontrol.2012.10.011"
- Description: Arthropods released for weed biocontrol can have effects other than simply removing biomass and frequently decrease photosynthetic rate more than can be attributed to the mere loss of photosynthetic surface area. Some of this effect may result because biological control agents facilitate the transfer and ingress of deleterious microbes into plant tissues on which they feed. We evaluated this facilitation effect using water hyacinth (Eichhornia crassipes) and a weevil (Neochetina eichhorniae) and compared the reductions in photosynthetic rates between leaves subject to herbivory by adult weevils sterilized with 3.5% chlorine bleach, to those that were unsterilized. The results showed that weevils carried both fungi and bacteria, transferred these to leaves on which they fed, and that microbes and biomass removal contributed almost equally to the 37% decrease in photosynthetic productivity. Hence, maximising the effectiveness of using arthropods that damage leaf surfaces for biocontrol requires the presence of microorganisms that are deleterious to plants.
- Full Text:
- Date Issued: 2013
- Authors: Venter, Nic , Hill, Martin P , Hutchinson, Sarah-Leigh , Ripley, Brad S
- Date: 2013
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/423573 , vital:72073 , xlink:href="https://doi.org/10.1016/j.biocontrol.2012.10.011"
- Description: Arthropods released for weed biocontrol can have effects other than simply removing biomass and frequently decrease photosynthetic rate more than can be attributed to the mere loss of photosynthetic surface area. Some of this effect may result because biological control agents facilitate the transfer and ingress of deleterious microbes into plant tissues on which they feed. We evaluated this facilitation effect using water hyacinth (Eichhornia crassipes) and a weevil (Neochetina eichhorniae) and compared the reductions in photosynthetic rates between leaves subject to herbivory by adult weevils sterilized with 3.5% chlorine bleach, to those that were unsterilized. The results showed that weevils carried both fungi and bacteria, transferred these to leaves on which they fed, and that microbes and biomass removal contributed almost equally to the 37% decrease in photosynthetic productivity. Hence, maximising the effectiveness of using arthropods that damage leaf surfaces for biocontrol requires the presence of microorganisms that are deleterious to plants.
- Full Text:
- Date Issued: 2013
Drought responses of selected C₄ photosynthetic NADP-Me and NAD-Me Panicoideae and Aristidoideae grasses
- Authors: Venter, Nicolaas
- Date: 2015
- Subjects: Aristida , Panicum , Switchgrass , Grasses -- Effect of drought on , Grasses -- Phylogeny , Photosynthesis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4272 , http://hdl.handle.net/10962/d1018549
- Description: Grass species within South Africa show a photosynthetic subtype and phylogenetic response to rainfall gradients, with Panicoideae species (NADP-Me and NAD-Me) inhabiting mesic environments, while Aristidoideae species (NADP-Me) inhabit more arid environments. It is predicted that climate change will alter rainfall patterns within southern Africa, which could have implications for grassland distributions and functional composition. Globally, and in South Africa, species distributions indicates that NAD-Me species have a preference for more arid environments, but this may be complicated by phylogeny as most NAD-Me species belong to the Chloridoideae subfamily. Additionally, differences in the metabolism and energetic requirements of different carboxylation types are expected to confer different ecological advantages, such as drought tolerance, but the role of these different pathways is not well understood. Based on natural distribution and photosynthetic subtype differences, it was hypothesised that Panicoideae NADP-Me species would be less drought tolerant than Panicoideae NAD-Me and Aristidoideae NADP-Me species and that subtypes and lineages would show different drought recovery rates. Furthermore, drought sensitivity would be of a metabolic and not a stomatal origin and plants that maintained favourable leaf water status would be more drought tolerant and recover faster. This was tested experimentally by comparing Panicoideae species (NADP-Me and NAD-Me) and NADP-Me species (Panicoideae and Aristidoideae). Plants were subjected to a progressive 58 day drought period and a recovery phase where gas exchange, chlorophyll fluorescence and leaf water relations were measured at select intervals. In conjunction with this, a rapid drought experiment was performed on Zea mays (NADP-Me: Panicoideae) plants where similar parameters were measured. Photosynthetic drought and recovery responses showed both a subtype and phylogenetic response. Panicoideae species were less drought tolerant than Aristidoideae species, although Panicoideae NAD-Me showed better recovery rates than Panicoideae NADP-Me species, while Aristidoideae species recovered the quickest. Panicoideae NAD-Me and Aristidoideae species maintained higher leaf water status during drought which contributed to the maintenance of PSII integrity and thus facilitated rapid photosynthetic recovery. During drought Panicoideae species showed greater metabolic limitations over Aristidoideae species and for the first time, lower metabolic limitations were associated with osmotic adjustment. This is a novel finding whereby osmotic adjustment and the subsequent maintenance of leaf water are key to preventing metabolic limitations of photosynthesis in C₄ grasses. Results from the Z. mays rapid drought study showed the limitations to photosynthesis were exclusively metabolic and unlikely to be a direct consequence of turgor loss. It was apparent that the response to drought was stronger amongst lineages, as NADP-Me species from different subfamilies showed a significant difference in drought tolerances. Aristidoideae species’ exceptional drought tolerance and predicted increased aridification could favour these species over Panicoideae species under future climates.
- Full Text:
- Date Issued: 2015
- Authors: Venter, Nicolaas
- Date: 2015
- Subjects: Aristida , Panicum , Switchgrass , Grasses -- Effect of drought on , Grasses -- Phylogeny , Photosynthesis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4272 , http://hdl.handle.net/10962/d1018549
- Description: Grass species within South Africa show a photosynthetic subtype and phylogenetic response to rainfall gradients, with Panicoideae species (NADP-Me and NAD-Me) inhabiting mesic environments, while Aristidoideae species (NADP-Me) inhabit more arid environments. It is predicted that climate change will alter rainfall patterns within southern Africa, which could have implications for grassland distributions and functional composition. Globally, and in South Africa, species distributions indicates that NAD-Me species have a preference for more arid environments, but this may be complicated by phylogeny as most NAD-Me species belong to the Chloridoideae subfamily. Additionally, differences in the metabolism and energetic requirements of different carboxylation types are expected to confer different ecological advantages, such as drought tolerance, but the role of these different pathways is not well understood. Based on natural distribution and photosynthetic subtype differences, it was hypothesised that Panicoideae NADP-Me species would be less drought tolerant than Panicoideae NAD-Me and Aristidoideae NADP-Me species and that subtypes and lineages would show different drought recovery rates. Furthermore, drought sensitivity would be of a metabolic and not a stomatal origin and plants that maintained favourable leaf water status would be more drought tolerant and recover faster. This was tested experimentally by comparing Panicoideae species (NADP-Me and NAD-Me) and NADP-Me species (Panicoideae and Aristidoideae). Plants were subjected to a progressive 58 day drought period and a recovery phase where gas exchange, chlorophyll fluorescence and leaf water relations were measured at select intervals. In conjunction with this, a rapid drought experiment was performed on Zea mays (NADP-Me: Panicoideae) plants where similar parameters were measured. Photosynthetic drought and recovery responses showed both a subtype and phylogenetic response. Panicoideae species were less drought tolerant than Aristidoideae species, although Panicoideae NAD-Me showed better recovery rates than Panicoideae NADP-Me species, while Aristidoideae species recovered the quickest. Panicoideae NAD-Me and Aristidoideae species maintained higher leaf water status during drought which contributed to the maintenance of PSII integrity and thus facilitated rapid photosynthetic recovery. During drought Panicoideae species showed greater metabolic limitations over Aristidoideae species and for the first time, lower metabolic limitations were associated with osmotic adjustment. This is a novel finding whereby osmotic adjustment and the subsequent maintenance of leaf water are key to preventing metabolic limitations of photosynthesis in C₄ grasses. Results from the Z. mays rapid drought study showed the limitations to photosynthesis were exclusively metabolic and unlikely to be a direct consequence of turgor loss. It was apparent that the response to drought was stronger amongst lineages, as NADP-Me species from different subfamilies showed a significant difference in drought tolerances. Aristidoideae species’ exceptional drought tolerance and predicted increased aridification could favour these species over Panicoideae species under future climates.
- Full Text:
- Date Issued: 2015
An investigation into the role of attitudes towards mathematics as a motivation for choosing vocational-technical secondary education
- Authors: Venter, Petrus Albertus
- Date: 1986
- Subjects: School children -- South Africa -- East London -- Attitudes Technical education -- South Africa -- East London Mathematical ability
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1831 , http://hdl.handle.net/10962/d1003813
- Description: From Introduction: As headmaster of a technical high school it is my responsibility to admit standard six pupils to this school. Often the refrain from parents is heard: "My son is weak in mathematics but good with his hands." These parents desperately seek a secondary education for their non-academic children. To what extent has the vicious circle of low achievement - negative attitude - lower achievement - despair already been established in these pupils as far as mathematics is concerned? How does this low self-concept in mathematics ability serve as a factor in deciding upon which career to follow, which type of high school to attend? Parents and the public at large seem to be ill-informed about the subjects offered at technical high schools. The mathematical character of these schools is especially undervalued. People often seem to think that the mathematics at a technical high school is easier than at other high schools. Furthermore, people do not realize that mathematics forms the cornerstone of any technical field of study. Failure in mathematics will inevitably lead to low marks or failure in technical subjects. It seems that many pupils who have already developed a defeatist attitude towards mathematics, seek entry into this type of high school. If so, then why? This study aims to elucidate the mathematical cognitive demands made by mathematically related subjects in a technical high school. At the same time possible relationships will be investigated between choice of type of high school (technical vs non-technical) and : i) attitudes to mathematics; ii) achievement in mathematics; iii) general academic achievement; iv) attitude to school. Pupils at standard five level have already established their attitudes towards subjects. For this study standard five boys from East London English and Afrikaans-speaking primary schools were involved. The reason why girls were not considered was to eliminate the variables of sex-related behaviours. Also, girls do not report in any large numbers for technical education as yet. The results of this study should be of use to those advising standard five pupils on their choice of type of high school. If satisfactory relationships are found between affective-cognitive variables and choice of high school, future researchers may use this towards the construction of a required profile for prospective pupils of technical high schools. There are of course, many other factors in the issue. Variables like social status, parents' own experiences, vested interests of academic high schools and many more are not considered in this study. It is conceded that any in-depth study into attitudes towards mathematics or into choice of type of high school is a many-faceted problem, the scope of which lies beyond this thesis. Suffice to admit that attitudes are complex dispositions resulting from the interactions between a number of affective, cognitive and psychomotor variables.
- Full Text:
- Date Issued: 1986
- Authors: Venter, Petrus Albertus
- Date: 1986
- Subjects: School children -- South Africa -- East London -- Attitudes Technical education -- South Africa -- East London Mathematical ability
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1831 , http://hdl.handle.net/10962/d1003813
- Description: From Introduction: As headmaster of a technical high school it is my responsibility to admit standard six pupils to this school. Often the refrain from parents is heard: "My son is weak in mathematics but good with his hands." These parents desperately seek a secondary education for their non-academic children. To what extent has the vicious circle of low achievement - negative attitude - lower achievement - despair already been established in these pupils as far as mathematics is concerned? How does this low self-concept in mathematics ability serve as a factor in deciding upon which career to follow, which type of high school to attend? Parents and the public at large seem to be ill-informed about the subjects offered at technical high schools. The mathematical character of these schools is especially undervalued. People often seem to think that the mathematics at a technical high school is easier than at other high schools. Furthermore, people do not realize that mathematics forms the cornerstone of any technical field of study. Failure in mathematics will inevitably lead to low marks or failure in technical subjects. It seems that many pupils who have already developed a defeatist attitude towards mathematics, seek entry into this type of high school. If so, then why? This study aims to elucidate the mathematical cognitive demands made by mathematically related subjects in a technical high school. At the same time possible relationships will be investigated between choice of type of high school (technical vs non-technical) and : i) attitudes to mathematics; ii) achievement in mathematics; iii) general academic achievement; iv) attitude to school. Pupils at standard five level have already established their attitudes towards subjects. For this study standard five boys from East London English and Afrikaans-speaking primary schools were involved. The reason why girls were not considered was to eliminate the variables of sex-related behaviours. Also, girls do not report in any large numbers for technical education as yet. The results of this study should be of use to those advising standard five pupils on their choice of type of high school. If satisfactory relationships are found between affective-cognitive variables and choice of high school, future researchers may use this towards the construction of a required profile for prospective pupils of technical high schools. There are of course, many other factors in the issue. Variables like social status, parents' own experiences, vested interests of academic high schools and many more are not considered in this study. It is conceded that any in-depth study into attitudes towards mathematics or into choice of type of high school is a many-faceted problem, the scope of which lies beyond this thesis. Suffice to admit that attitudes are complex dispositions resulting from the interactions between a number of affective, cognitive and psychomotor variables.
- Full Text:
- Date Issued: 1986
Heterologous expression of the helicoverpa armigera stunt virus in Saccharomyces cerevisiae
- Authors: Venter, Philip Arno
- Date: 2002
- Subjects: Helicoverpa armigera Saccharomyces cerevisiae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3895 , http://hdl.handle.net/10962/d1003811
- Description: Lepidopteran insects like Helicoverpa armigera, more commonly known as the cotton bollworm, are economically important pests of a wide variety of crops throughout the world. The Helicoverpa armigera stunt virus (HaSV), a tetravirus with a bipartite single-stranded positive-sense RNA genome, has great potential as a biological pesticide against H. armigera. The larger genomic strand of this virus (RNA1) encodes the viral replicase, while the other (RNA2) encodes the 71 kDa capsid protein precursor (p71). 240 copies of p71 assemble into a procapsid with the concomitant encapsidation of the viral RNA. This is followed by a complex maturation event that is characterized by the autoproteolytic cleavage of p71 into the 64 kDa capsid protein (P64) and a 7 kDa peptide (p7). The rearrangements that occur during maturation results in the formation of mature HaSV capsids that can thereupon deliver RNA to other susceptible host cells. The principal objective of the research described in this study was to demonstrate that this virus could be assembled in Saccharomyces cerevisiae. S. cerevisiae expression vectors were constructed for the production of p71. This protein was detected in cell lysates from two different strains of S. cerevisiae, both containing either chromosomal or episomal copies of an expression cassette for P71. A number of factors relating to the expression of P71 (e.g. strains used, expression loci and expression rate) and the preparation of protein extracts from S. cerevisiae (e.g. the presence of various protease inhibitors and salt concentrations) were examined to attain optimal levels of soluble p71. A small fraction of the optimized soluble p71 was shown to be in the form of virus-like particles (VLPs), with a yield of ≤10⁷ VLPs from a 1.5l culture of P71⁺ cells. These particles were exclusively in the procapsid form, had a similar buoyant density to that of wild-type HaSV and could undergo maturation when the pH was reduced to 5. S. cerevisiae vectors were constructed for the episomal expression of the HaSV genomic RNAs. These vectors directed the transcription of RNA1 and RNA2 transcripts, which had similar sizes to those of the HaSV genomic RNAs. Mature HaSV particles were purified from cells, transgenic for P71, RNA1 and RNA2, by way of two different virus purification protocols that were developed during this study. RT-PCR analyses on RNA-extracts from these particles demonstrated that RNA transcripts, which were produced in trans with p71, could be encapsidated by HaSV capsids in S. cerevisiae. A droplet-feed bioassay on H. armigera larvae demonstrated that the S. cerevisiae-derived HaSV particles caused impaired larval development. This response was correlated with the detection of HaSV RNA2 in RNA extractions from larvae that were used in this bioassay. The results that were generated through the course of this study, provided proof for the concept of the non-host production of infectious HaSV particles from S. cerevisiae. This work could serve as a foundation for future research on the development of an expression system for the large-scale production of this virus as a biopesticide.
- Full Text:
- Date Issued: 2002
- Authors: Venter, Philip Arno
- Date: 2002
- Subjects: Helicoverpa armigera Saccharomyces cerevisiae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3895 , http://hdl.handle.net/10962/d1003811
- Description: Lepidopteran insects like Helicoverpa armigera, more commonly known as the cotton bollworm, are economically important pests of a wide variety of crops throughout the world. The Helicoverpa armigera stunt virus (HaSV), a tetravirus with a bipartite single-stranded positive-sense RNA genome, has great potential as a biological pesticide against H. armigera. The larger genomic strand of this virus (RNA1) encodes the viral replicase, while the other (RNA2) encodes the 71 kDa capsid protein precursor (p71). 240 copies of p71 assemble into a procapsid with the concomitant encapsidation of the viral RNA. This is followed by a complex maturation event that is characterized by the autoproteolytic cleavage of p71 into the 64 kDa capsid protein (P64) and a 7 kDa peptide (p7). The rearrangements that occur during maturation results in the formation of mature HaSV capsids that can thereupon deliver RNA to other susceptible host cells. The principal objective of the research described in this study was to demonstrate that this virus could be assembled in Saccharomyces cerevisiae. S. cerevisiae expression vectors were constructed for the production of p71. This protein was detected in cell lysates from two different strains of S. cerevisiae, both containing either chromosomal or episomal copies of an expression cassette for P71. A number of factors relating to the expression of P71 (e.g. strains used, expression loci and expression rate) and the preparation of protein extracts from S. cerevisiae (e.g. the presence of various protease inhibitors and salt concentrations) were examined to attain optimal levels of soluble p71. A small fraction of the optimized soluble p71 was shown to be in the form of virus-like particles (VLPs), with a yield of ≤10⁷ VLPs from a 1.5l culture of P71⁺ cells. These particles were exclusively in the procapsid form, had a similar buoyant density to that of wild-type HaSV and could undergo maturation when the pH was reduced to 5. S. cerevisiae vectors were constructed for the episomal expression of the HaSV genomic RNAs. These vectors directed the transcription of RNA1 and RNA2 transcripts, which had similar sizes to those of the HaSV genomic RNAs. Mature HaSV particles were purified from cells, transgenic for P71, RNA1 and RNA2, by way of two different virus purification protocols that were developed during this study. RT-PCR analyses on RNA-extracts from these particles demonstrated that RNA transcripts, which were produced in trans with p71, could be encapsidated by HaSV capsids in S. cerevisiae. A droplet-feed bioassay on H. armigera larvae demonstrated that the S. cerevisiae-derived HaSV particles caused impaired larval development. This response was correlated with the detection of HaSV RNA2 in RNA extractions from larvae that were used in this bioassay. The results that were generated through the course of this study, provided proof for the concept of the non-host production of infectious HaSV particles from S. cerevisiae. This work could serve as a foundation for future research on the development of an expression system for the large-scale production of this virus as a biopesticide.
- Full Text:
- Date Issued: 2002
Die psigopaat as kliënt in die Maatskaplike Werk
- Authors: Venter, Pieter Viviers
- Date: 1977
- Language: Afrikaans
- Type: Thesis , Masters , MSocSc
- Identifier: vital:21106 , http://hdl.handle.net/10962/6410
- Full Text:
- Date Issued: 1977
- Authors: Venter, Pieter Viviers
- Date: 1977
- Language: Afrikaans
- Type: Thesis , Masters , MSocSc
- Identifier: vital:21106 , http://hdl.handle.net/10962/6410
- Full Text:
- Date Issued: 1977
The safety of journalists: an assessment of perceptions of the origins and implementation of policy at two international television news agencies
- Authors: Venter, Sahm
- Date: 2005
- Subjects: Reuters Television , Associated Press Television News , Journalism -- Safety measures , Journalists -- Protection , News agencies -- Safety measures
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3491 , http://hdl.handle.net/10962/d1002946 , Reuters Television , Associated Press Television News , Journalism -- Safety measures , Journalists -- Protection , News agencies -- Safety measures
- Description: Being a journalist today can be a deadly pursuit, particularly for those covering conflict and other dangerous assignments. In 2004 more journalists and other media workers were killed than in the last ten years. While it is impossible to guarantee that journalists will not be killed or injured, kidnapped or detained, a policy has been created to help protect them in the course of their duties. This study examines the perceptions of journalists working for two international television news agencies about this safety policy called the ‘Joint code of practice for journalists working in conflict zones’. This policy was adopted in November 2000 by five major television companies including the television news agencies Reuters Television and Associated Press Television News. This study finds that the policy had significant flaws in how it was formulated and how it is communicated, implemented and reviewed. Recognising the existence of unequal relations of power and conflicting interests at play in any policy process, this study stresses that in the case of the journalist safety policy, all stakeholders should have participated in the relevant policy stages. This argument arises from researching the policy document as well as from the point of view of managers, and particularly journalists who work on dangerous assignments, either full-time or on a freelance basis for either of the two television news agencies. It finds that while journalists are not generally aware of the policy, they do practice many of its elements as well as a range of their own custom-made strategies to protect themselves. The result is to make the policy less effective than it could be.
- Full Text:
- Date Issued: 2005
- Authors: Venter, Sahm
- Date: 2005
- Subjects: Reuters Television , Associated Press Television News , Journalism -- Safety measures , Journalists -- Protection , News agencies -- Safety measures
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3491 , http://hdl.handle.net/10962/d1002946 , Reuters Television , Associated Press Television News , Journalism -- Safety measures , Journalists -- Protection , News agencies -- Safety measures
- Description: Being a journalist today can be a deadly pursuit, particularly for those covering conflict and other dangerous assignments. In 2004 more journalists and other media workers were killed than in the last ten years. While it is impossible to guarantee that journalists will not be killed or injured, kidnapped or detained, a policy has been created to help protect them in the course of their duties. This study examines the perceptions of journalists working for two international television news agencies about this safety policy called the ‘Joint code of practice for journalists working in conflict zones’. This policy was adopted in November 2000 by five major television companies including the television news agencies Reuters Television and Associated Press Television News. This study finds that the policy had significant flaws in how it was formulated and how it is communicated, implemented and reviewed. Recognising the existence of unequal relations of power and conflicting interests at play in any policy process, this study stresses that in the case of the journalist safety policy, all stakeholders should have participated in the relevant policy stages. This argument arises from researching the policy document as well as from the point of view of managers, and particularly journalists who work on dangerous assignments, either full-time or on a freelance basis for either of the two television news agencies. It finds that while journalists are not generally aware of the policy, they do practice many of its elements as well as a range of their own custom-made strategies to protect themselves. The result is to make the policy less effective than it could be.
- Full Text:
- Date Issued: 2005
The effects of three carbohydrate supplementation protocols on the blood glucose levels in type I diabetic subjects during a 60 minute bout on the treadmill
- Authors: Venter, Teneille
- Date: 2014
- Subjects: Glucose tolerance tests , Diabetes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4157 , vital:20561
- Description: Diabetes associated complications make management during exercise complex (Brugnara, Vinaixa, Murillo, Samino, Rodriguez, Beltran, Lerin, Davison, Correig & Novials, 2012). Research on the prevention of such challenges is of paramount importance. The aim of this study was to determine the effects of three different carbohydrate supplementation protocols on blood glucose levels after every 10 minutes of a 60 minute exercise bout at 65 to 75 % HRR on the treadmill as well as every half hour during a two hour post exercise recovery period. The three protocols implemented after a standardized pre-exercise meal were: control protocol (no carbohydrate supplementation), protocol 1 (one carbohydrate supplementation of 15 grams given at 30 minutes) and protocol 2 (two carbohydrate supplementation of 15 grams given at 30 minutes and 45 minutes). A total of 32 participants took part in the study (Mean age: 32.84 ±12.12). All participants were submitted to all three protocols. Statistical and practical significant differences were found between blood glucose levels of protocol 0 and protocol 1 (MDIF = 2.62 ± 3.99 mmol.L--‐1) at 20 minutes of the exercise duration (p=.024;d=0.42). Statistical and practical significant differences in blood glucose levels with protocol 0 rendering the higher glucose values were also found between protocols 0 and 2 at 10 minutes (MDIF = 3.44 ± 5.54 mmol.L--‐1; p=.001;d=0.62), 20 minutes (MDIF = 3.32 ± 5.23 mmol.L--‐1; p=.001;d=0.63) and 30 minutes of exercise (MDIF = 2.81 ± 5.40 mmol.L--‐1; p=.006;d=0.52) as well as between the mean minimum (M0 = 9.49 ± 4.51 mmol.L--‐1 and M2 = 7.28 ± 4.07 mmol.L--‐1; p=.013;d=0.46), mean maximum (M0 = 12.73 ± 5.51 mmol.L--‐1 and M2 = 10.07 ± 4.63 mmol.L--‐1; p=.015;d=0.46) and overall mean (M0 = 9.07 ± 4.88 mmol.L--‐1 and M2 = 8.53 ± 4.25 mmol.L--‐1; p=.011;d=0.48) with protocol 0 rendering the higher glucose values in all these comparisons. It was concluded that carbohydrate supplementation during exercise affects blood glucose levels positively particularly considering the significant difference found between protocol 0 and 2. Whilst protocol 2 also resulted in less fluctuations in the blood glucose levels during exercise and minimum, overall mean and maximum blood glucose values were closer to “normal/safe” range, there was no conclusive evidence that protocol 2 was better than protocol 1.
- Full Text:
- Authors: Venter, Teneille
- Date: 2014
- Subjects: Glucose tolerance tests , Diabetes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4157 , vital:20561
- Description: Diabetes associated complications make management during exercise complex (Brugnara, Vinaixa, Murillo, Samino, Rodriguez, Beltran, Lerin, Davison, Correig & Novials, 2012). Research on the prevention of such challenges is of paramount importance. The aim of this study was to determine the effects of three different carbohydrate supplementation protocols on blood glucose levels after every 10 minutes of a 60 minute exercise bout at 65 to 75 % HRR on the treadmill as well as every half hour during a two hour post exercise recovery period. The three protocols implemented after a standardized pre-exercise meal were: control protocol (no carbohydrate supplementation), protocol 1 (one carbohydrate supplementation of 15 grams given at 30 minutes) and protocol 2 (two carbohydrate supplementation of 15 grams given at 30 minutes and 45 minutes). A total of 32 participants took part in the study (Mean age: 32.84 ±12.12). All participants were submitted to all three protocols. Statistical and practical significant differences were found between blood glucose levels of protocol 0 and protocol 1 (MDIF = 2.62 ± 3.99 mmol.L--‐1) at 20 minutes of the exercise duration (p=.024;d=0.42). Statistical and practical significant differences in blood glucose levels with protocol 0 rendering the higher glucose values were also found between protocols 0 and 2 at 10 minutes (MDIF = 3.44 ± 5.54 mmol.L--‐1; p=.001;d=0.62), 20 minutes (MDIF = 3.32 ± 5.23 mmol.L--‐1; p=.001;d=0.63) and 30 minutes of exercise (MDIF = 2.81 ± 5.40 mmol.L--‐1; p=.006;d=0.52) as well as between the mean minimum (M0 = 9.49 ± 4.51 mmol.L--‐1 and M2 = 7.28 ± 4.07 mmol.L--‐1; p=.013;d=0.46), mean maximum (M0 = 12.73 ± 5.51 mmol.L--‐1 and M2 = 10.07 ± 4.63 mmol.L--‐1; p=.015;d=0.46) and overall mean (M0 = 9.07 ± 4.88 mmol.L--‐1 and M2 = 8.53 ± 4.25 mmol.L--‐1; p=.011;d=0.48) with protocol 0 rendering the higher glucose values in all these comparisons. It was concluded that carbohydrate supplementation during exercise affects blood glucose levels positively particularly considering the significant difference found between protocol 0 and 2. Whilst protocol 2 also resulted in less fluctuations in the blood glucose levels during exercise and minimum, overall mean and maximum blood glucose values were closer to “normal/safe” range, there was no conclusive evidence that protocol 2 was better than protocol 1.
- Full Text:
Southern African HIV Clinicians Society guidelines for antiretroviral therapy in adults: 2020 update
- Venter, Willem D F, Woods, Joana F, Rosie Burton, John M. Black, Graeme Meintjes, Natasha E.C.G. Davies, Gary Maartens, Sipho Dlamini, Jeremy Nel, Eric Hefer, Moeketsi T. Mathe, Mahomed-Yunus Moosa, Muhangwi B. Mulaudzi, Michelle Moorhouse, Jennifer Nash, Thandeka C. Nkonyane, Wolfgang Preiser, Mohammed S. Rassool, David Stead, Helen van der Plas, Cloete van Vuuren
- Authors: Venter, Willem D F , Woods, Joana F , Rosie Burton , John M. Black , Graeme Meintjes , Natasha E.C.G. Davies , Gary Maartens , Sipho Dlamini , Jeremy Nel , Eric Hefer , Moeketsi T. Mathe , Mahomed-Yunus Moosa , Muhangwi B. Mulaudzi , Michelle Moorhouse , Jennifer Nash , Thandeka C. Nkonyane , Wolfgang Preiser , Mohammed S. Rassool , David Stead , Helen van der Plas , Cloete van Vuuren
- Date: 2020
- Language: English
- Type: Journal Article
- Identifier: http://hdl.handle.net/11260/4280 , vital:44078
- Full Text:
Southern African HIV Clinicians Society guidelines for antiretroviral therapy in adults: 2020 update
- Authors: Venter, Willem D F , Woods, Joana F , Rosie Burton , John M. Black , Graeme Meintjes , Natasha E.C.G. Davies , Gary Maartens , Sipho Dlamini , Jeremy Nel , Eric Hefer , Moeketsi T. Mathe , Mahomed-Yunus Moosa , Muhangwi B. Mulaudzi , Michelle Moorhouse , Jennifer Nash , Thandeka C. Nkonyane , Wolfgang Preiser , Mohammed S. Rassool , David Stead , Helen van der Plas , Cloete van Vuuren
- Date: 2020
- Language: English
- Type: Journal Article
- Identifier: http://hdl.handle.net/11260/4280 , vital:44078
- Full Text:
Green Apartheid: Urban green infrastructure remains unequally distributed across income and race geographies in South Africa
- Venter, Zander S, Shackleton, Charlie M, Van Staden, Francini, Selomane, Odirilwe, Masterson, Vanessa A
- Authors: Venter, Zander S , Shackleton, Charlie M , Van Staden, Francini , Selomane, Odirilwe , Masterson, Vanessa A
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/160323 , vital:40435 , https://doi.org/10.1016/j.landurbplan.2020.103889 , https://researchdata.ru.ac.za/search?q=:keyword: "Environmental justice"
- Description: Urban green infrastructure provides ecosystem services that are essential to human wellbeing. A dearth of national-scale assessments in the Global South has precluded the ability to explore how political regimes, such as the forced racial segregation in South Africa during and after Apartheid, have influenced the extent of and access to green infrastructure over time. We investigate whether there are disparities in green infrastructure distributions across race and income geographies in urban South Africa. Using open-source satellite imagery and geographic information, along with national census statistics, we find that public and private green infrastructure is more abundant, accessible, greener and more treed in high-income relative to low-income areas, and in areas where previously advantaged racial groups (i.e. White citizens) reside.
- Full Text:
- Date Issued: 2020
- Authors: Venter, Zander S , Shackleton, Charlie M , Van Staden, Francini , Selomane, Odirilwe , Masterson, Vanessa A
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/160323 , vital:40435 , https://doi.org/10.1016/j.landurbplan.2020.103889 , https://researchdata.ru.ac.za/search?q=:keyword: "Environmental justice"
- Description: Urban green infrastructure provides ecosystem services that are essential to human wellbeing. A dearth of national-scale assessments in the Global South has precluded the ability to explore how political regimes, such as the forced racial segregation in South Africa during and after Apartheid, have influenced the extent of and access to green infrastructure over time. We investigate whether there are disparities in green infrastructure distributions across race and income geographies in urban South Africa. Using open-source satellite imagery and geographic information, along with national census statistics, we find that public and private green infrastructure is more abundant, accessible, greener and more treed in high-income relative to low-income areas, and in areas where previously advantaged racial groups (i.e. White citizens) reside.
- Full Text:
- Date Issued: 2020
Is green space associated with reduced crime? A national-scale study from the Global South
- Venter, Zander S, Shackleton, Charlie M, Faull, Andrew, Lancaster, Lizette, Breetzke, Gregory, Edelstein, Ian
- Authors: Venter, Zander S , Shackleton, Charlie M , Faull, Andrew , Lancaster, Lizette , Breetzke, Gregory , Edelstein, Ian
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/402340 , vital:69843 , xlink:href="https://doi.org/10.1016/j.scitotenv.2022.154005"
- Description: Assumptions about the link between green space and crime mitigation are informed by literature that overwhelmingly originates in the Global North. Little is known about the association between green spaces and crime in the Global South. We utilized 10 years of precinct-level crime statistics (n = 1152) over South Africa, a global crime hotspot, to test the hypothesis that green space is associated with reduced crime rates. We found that, after controlling for a number of socio-demographic confounders (unemployment, income, age, education, land use and population density), for every 1% increase in total green space there is a 1.2% (0.7 to 1.7%; 95% confidence interval) decrease in violent crime, and 1.3% (0.8 to 1.8%) decrease in property crime, with no effect on sexual crimes. However, the direction of the association changed for property crimes when exploring the effect of green space characteristics including tree cover and park accessibility. Property crimes increase by 0.4% (0.1 to 0.7%) with a percentage increase in tree cover, and by 0.9% (0.5 to 1.3%) with every kilometer increase in proximity to a public park. Further research, including experimental studies, is needed to better isolate causal mechanisms behind crime-green space associations, especially considering that green space may map to race and income inequality and that there may be more crime reporting in affluent areas. Nevertheless, our results provide a complementary contribution to the evidence from the Global North, highlighting the need for more nuanced definitions of green space and its characteristics when considering links to crime. When viewed in light of the broader suite of ecosystem services provided by green space, our results support urban greening as a major strategy towards achieving just and sustainable cities and towns.
- Full Text:
- Date Issued: 2022
- Authors: Venter, Zander S , Shackleton, Charlie M , Faull, Andrew , Lancaster, Lizette , Breetzke, Gregory , Edelstein, Ian
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/402340 , vital:69843 , xlink:href="https://doi.org/10.1016/j.scitotenv.2022.154005"
- Description: Assumptions about the link between green space and crime mitigation are informed by literature that overwhelmingly originates in the Global North. Little is known about the association between green spaces and crime in the Global South. We utilized 10 years of precinct-level crime statistics (n = 1152) over South Africa, a global crime hotspot, to test the hypothesis that green space is associated with reduced crime rates. We found that, after controlling for a number of socio-demographic confounders (unemployment, income, age, education, land use and population density), for every 1% increase in total green space there is a 1.2% (0.7 to 1.7%; 95% confidence interval) decrease in violent crime, and 1.3% (0.8 to 1.8%) decrease in property crime, with no effect on sexual crimes. However, the direction of the association changed for property crimes when exploring the effect of green space characteristics including tree cover and park accessibility. Property crimes increase by 0.4% (0.1 to 0.7%) with a percentage increase in tree cover, and by 0.9% (0.5 to 1.3%) with every kilometer increase in proximity to a public park. Further research, including experimental studies, is needed to better isolate causal mechanisms behind crime-green space associations, especially considering that green space may map to race and income inequality and that there may be more crime reporting in affluent areas. Nevertheless, our results provide a complementary contribution to the evidence from the Global North, highlighting the need for more nuanced definitions of green space and its characteristics when considering links to crime. When viewed in light of the broader suite of ecosystem services provided by green space, our results support urban greening as a major strategy towards achieving just and sustainable cities and towns.
- Full Text:
- Date Issued: 2022
Happiness levels amongst South African Veterinarians
- Authors: Venter,Cordene
- Date: 2018
- Subjects: Happiness , Job satisfaction , Veterinarians -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/45745 , vital:38960
- Description: Happiness is a new field of study in various healthcare fields. Researchers indicated that although there are numerous studies investigating mental well-being amongst veterinarians, scientific research into happiness in veterinary medicine has not begun and that happiness levels of veterinarians are unknown. This treatise is the first known study examining the happiness levels of South African veterinarians and the implications that increased happiness levels can have for organisations who employ veterinarians. An in-depth literature review was conducted and the two main constructs of happiness – eudaimonia and hedonism were examined. Additionally, the three theories of happiness, namely set-point theory, social comparison theory and the affect theory were explored and the importance of happiness in the workplace was established. The literature further laid the foundation for the conceptual model that proposed influence in the workplace, social relationships, satisfaction with work-life balance, purpose, optimism, work satisfaction, work stress and leisure lead to happiness of South African veterinarians. The study concludes with managerial recommendations that veterinary practice owners can implement to increase the happiness levels of their veterinarians so that they can have social, financial and personal gain. encourage their employees to pursue leisure activities. Life coaches or industrial psychologists can be used to bridge the generational gap between veterinarians and to minimise interpersonal conflict. Moreover, managers need to have conversations with their employees to understand their needs and to help them achieve their professional goals.
- Full Text:
- Date Issued: 2018
- Authors: Venter,Cordene
- Date: 2018
- Subjects: Happiness , Job satisfaction , Veterinarians -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/45745 , vital:38960
- Description: Happiness is a new field of study in various healthcare fields. Researchers indicated that although there are numerous studies investigating mental well-being amongst veterinarians, scientific research into happiness in veterinary medicine has not begun and that happiness levels of veterinarians are unknown. This treatise is the first known study examining the happiness levels of South African veterinarians and the implications that increased happiness levels can have for organisations who employ veterinarians. An in-depth literature review was conducted and the two main constructs of happiness – eudaimonia and hedonism were examined. Additionally, the three theories of happiness, namely set-point theory, social comparison theory and the affect theory were explored and the importance of happiness in the workplace was established. The literature further laid the foundation for the conceptual model that proposed influence in the workplace, social relationships, satisfaction with work-life balance, purpose, optimism, work satisfaction, work stress and leisure lead to happiness of South African veterinarians. The study concludes with managerial recommendations that veterinary practice owners can implement to increase the happiness levels of their veterinarians so that they can have social, financial and personal gain. encourage their employees to pursue leisure activities. Life coaches or industrial psychologists can be used to bridge the generational gap between veterinarians and to minimise interpersonal conflict. Moreover, managers need to have conversations with their employees to understand their needs and to help them achieve their professional goals.
- Full Text:
- Date Issued: 2018
Opportunities for eco-efficiency at Summerpride Foods Ltd.: a pineapple processing factory
- Venters, Bruce Russell Ainsley
- Authors: Venters, Bruce Russell Ainsley
- Date: 2007
- Subjects: Summerpride Foods Ltd. (South Africa) Environmental protection -- South Africa Industries -- Environmental aspects -- South Africa Pineapple industry -- South Africa Environmental policy -- South Africa Sustainable development -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:787 , http://hdl.handle.net/10962/d1003908
- Description: International awareness and demands for the protection of the environment by the public on industry has only been pushed into the limelight in the past couple of decades. Prior to this it could be argued that it was accepted that environmental protection and economic development were at odds. However it has since been recognised that there is a need to achieve environmental sustainability, the concept of which was released in the 1987 Brundtland Report released by the United Nations. There are a number of ways that industry can reduce its impact on the environment and thus help reach this goal. While some advocated that stricter legislation would result in greater innovation by industry in “cleaning-up” its act, such as the Porter Hypothesis, there were also a number of new concepts and voluntary industry codes being developed. These new practices and codes have been promoted by organisations such as the International Chamber of Commerce and include technological improvements within organisations and improved resource productivity. The aim of this case study research was to find out what the environmental policy and related performance of Summerpride Foods Ltd, a pineapple processing factory in East London was and does an understanding of its environmental performance provide insights for improved efficiency. This involved the identification and analysis of what resources were used during the processing of pineapples as well as making recommendations that would result in increased efficiencies of their use. Due to the number of resources identified, only the use of water and coal which were ranked as having the highest impact were investigated further. The literature review showed that there are industry moves to applying cleaner production and eco-efficiency concepts as a means to attaining environmental sustainability. There are a number of voluntary environmental management system standards and codes that organisations can subscribe to with most probably the ISO 14001 standard being the most internationally recognised. There are many benefits to organisations adopting such standards. The use of lifecycle assessments is a useful tool that can be used to assess the environmental impact of a product through its entire life and thus enable one to identify all resources used and their impact, as well as to provide the information required to quantify areas where the greatest improvements can be made. The results of this research showed that at the start of the study, there was no formal environmental policy in place at Summerpride Foods Ltd and that this was starting to become a requirement with some customers. The detailed results which focused on water and coal usage showed that current operating methods do not recognise the importance of any wastage and that there are a number of changes that could be made that would not only result in better efficiency of use but would also result in substantial financial savings to the organisation. Summerpride Foods Ltd currently has a number of systems in place that help reduce its impact on the environment but these are not formally recorded. Summerpride Foods Ltd should adopt the principles of eco-efficiency and record all systems that impact on the environment. This would be the first step to attaining a formal environmental management system accreditation which due the increasing competitiveness of the international market in which Summerpride Foods Ltd operates, would give it a degree of advantage over those competing pineapples processing factories that do not have such accreditation.
- Full Text:
- Date Issued: 2007
- Authors: Venters, Bruce Russell Ainsley
- Date: 2007
- Subjects: Summerpride Foods Ltd. (South Africa) Environmental protection -- South Africa Industries -- Environmental aspects -- South Africa Pineapple industry -- South Africa Environmental policy -- South Africa Sustainable development -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:787 , http://hdl.handle.net/10962/d1003908
- Description: International awareness and demands for the protection of the environment by the public on industry has only been pushed into the limelight in the past couple of decades. Prior to this it could be argued that it was accepted that environmental protection and economic development were at odds. However it has since been recognised that there is a need to achieve environmental sustainability, the concept of which was released in the 1987 Brundtland Report released by the United Nations. There are a number of ways that industry can reduce its impact on the environment and thus help reach this goal. While some advocated that stricter legislation would result in greater innovation by industry in “cleaning-up” its act, such as the Porter Hypothesis, there were also a number of new concepts and voluntary industry codes being developed. These new practices and codes have been promoted by organisations such as the International Chamber of Commerce and include technological improvements within organisations and improved resource productivity. The aim of this case study research was to find out what the environmental policy and related performance of Summerpride Foods Ltd, a pineapple processing factory in East London was and does an understanding of its environmental performance provide insights for improved efficiency. This involved the identification and analysis of what resources were used during the processing of pineapples as well as making recommendations that would result in increased efficiencies of their use. Due to the number of resources identified, only the use of water and coal which were ranked as having the highest impact were investigated further. The literature review showed that there are industry moves to applying cleaner production and eco-efficiency concepts as a means to attaining environmental sustainability. There are a number of voluntary environmental management system standards and codes that organisations can subscribe to with most probably the ISO 14001 standard being the most internationally recognised. There are many benefits to organisations adopting such standards. The use of lifecycle assessments is a useful tool that can be used to assess the environmental impact of a product through its entire life and thus enable one to identify all resources used and their impact, as well as to provide the information required to quantify areas where the greatest improvements can be made. The results of this research showed that at the start of the study, there was no formal environmental policy in place at Summerpride Foods Ltd and that this was starting to become a requirement with some customers. The detailed results which focused on water and coal usage showed that current operating methods do not recognise the importance of any wastage and that there are a number of changes that could be made that would not only result in better efficiency of use but would also result in substantial financial savings to the organisation. Summerpride Foods Ltd currently has a number of systems in place that help reduce its impact on the environment but these are not formally recorded. Summerpride Foods Ltd should adopt the principles of eco-efficiency and record all systems that impact on the environment. This would be the first step to attaining a formal environmental management system accreditation which due the increasing competitiveness of the international market in which Summerpride Foods Ltd operates, would give it a degree of advantage over those competing pineapples processing factories that do not have such accreditation.
- Full Text:
- Date Issued: 2007
A framework to address the shortage of registered nurses in South Africa in alignment with the national health insurance requirement
- Authors: Venturini, Ronwyn
- Date: 2018
- Subjects: Nursing -- South Africa , Nursing -- Manpower -- South Africa Nursing services -- South Africa -- Administration Skilled labor -- South Africa Labor supply -- South Africa Manpower planning -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/36782 , vital:34054
- Description: In South Africa, there is a dire need for good quality healthcare in the public and private sectors. To achieve the aforementioned, the shortage of medical personnel is of utmost concern and the ability to retain these qualified individuals an even greater dilemma. The Department of Health in South Africa has embarked on a National Health Insurance model they want to introduce similar to the first world countries such as the British and American systems whereby medical insurance is free for all and not a single citizen is left unattended in their time of need. The primary purpose of this study was to identify a framework that will enable the South African government to implement a successful National Health Insurance system. Key theoretical factors (remuneration and rewards, work climate, stress, job satisfaction, recognition and bedside nursing) were investigated to ascertain what the key contributors are regarding the shortage of registered nurses. The identification of pertinent factors will promote the retention of nurses, which represent the population of this study. A questionnaire was designed by the researcher to collect the data from the sample, which consisted of 99 registered nurses in both public and the private sectors in South Africa across the provinces namely Gauteng, Eastern Cape, Western Cape Kwa-Zulu Natal, Free State, Limpopo and North West. The data collection process included electronic and hard copies of the questionnaires that were administered using the self-selected sampling and snowball non-probability sampling strategies. Descriptive statistics were conducted on the empirical data collected; and inferential statistics in the form of multiple regression analysis was used to test the hypotheses formulated. The study found that recognition is the only contributor that is directly related to the shortage of registered nurses. The framework established should assist policy makers and government to understand the contributing factors exacerbating the shortage of registered nurses.
- Full Text:
- Date Issued: 2018
- Authors: Venturini, Ronwyn
- Date: 2018
- Subjects: Nursing -- South Africa , Nursing -- Manpower -- South Africa Nursing services -- South Africa -- Administration Skilled labor -- South Africa Labor supply -- South Africa Manpower planning -- South Africa
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/36782 , vital:34054
- Description: In South Africa, there is a dire need for good quality healthcare in the public and private sectors. To achieve the aforementioned, the shortage of medical personnel is of utmost concern and the ability to retain these qualified individuals an even greater dilemma. The Department of Health in South Africa has embarked on a National Health Insurance model they want to introduce similar to the first world countries such as the British and American systems whereby medical insurance is free for all and not a single citizen is left unattended in their time of need. The primary purpose of this study was to identify a framework that will enable the South African government to implement a successful National Health Insurance system. Key theoretical factors (remuneration and rewards, work climate, stress, job satisfaction, recognition and bedside nursing) were investigated to ascertain what the key contributors are regarding the shortage of registered nurses. The identification of pertinent factors will promote the retention of nurses, which represent the population of this study. A questionnaire was designed by the researcher to collect the data from the sample, which consisted of 99 registered nurses in both public and the private sectors in South Africa across the provinces namely Gauteng, Eastern Cape, Western Cape Kwa-Zulu Natal, Free State, Limpopo and North West. The data collection process included electronic and hard copies of the questionnaires that were administered using the self-selected sampling and snowball non-probability sampling strategies. Descriptive statistics were conducted on the empirical data collected; and inferential statistics in the form of multiple regression analysis was used to test the hypotheses formulated. The study found that recognition is the only contributor that is directly related to the shortage of registered nurses. The framework established should assist policy makers and government to understand the contributing factors exacerbating the shortage of registered nurses.
- Full Text:
- Date Issued: 2018
Generic substitution: the use of medicinal products containing different salts and implications for safety and efficacy
- Verbeeck, R K, Kanfer, Isadore, Walker, Roderick B
- Authors: Verbeeck, R K , Kanfer, Isadore , Walker, Roderick B
- Date: 2006
- Language: English
- Type: text , Article
- Identifier: vital:6445 , http://hdl.handle.net/10962/d1006632
- Description: In their quest to gain early entry of new generic products into the market prior to patent expiration, one of the strategies pursued by generic drug product manufacturers is to incorporate different salts of an approved active pharmaceutical ingredient (API) in a brand company's marketed dosage form and subject such dosage forms to bioequivalence assessment. These initiatives present challenges to regulatory authorities where the decision to approve bioequivalent products containing such pharmaceutical alternatives must be considered in the light of safety and efficacy, and more particularly, with respect to their substitutability. This article describes the various issues and contentions associated with the concept of pharmaceutical alternatives, specifically with respect to the uses of different salts and the implications for safety, efficacy and generic substitution.
- Full Text:
- Date Issued: 2006
- Authors: Verbeeck, R K , Kanfer, Isadore , Walker, Roderick B
- Date: 2006
- Language: English
- Type: text , Article
- Identifier: vital:6445 , http://hdl.handle.net/10962/d1006632
- Description: In their quest to gain early entry of new generic products into the market prior to patent expiration, one of the strategies pursued by generic drug product manufacturers is to incorporate different salts of an approved active pharmaceutical ingredient (API) in a brand company's marketed dosage form and subject such dosage forms to bioequivalence assessment. These initiatives present challenges to regulatory authorities where the decision to approve bioequivalent products containing such pharmaceutical alternatives must be considered in the light of safety and efficacy, and more particularly, with respect to their substitutability. This article describes the various issues and contentions associated with the concept of pharmaceutical alternatives, specifically with respect to the uses of different salts and the implications for safety, efficacy and generic substitution.
- Full Text:
- Date Issued: 2006
Hot jazz sets square alive
- Authors: Verdal, Garth
- Language: English
- Type: Article
- Identifier: vital:13664 , http://hdl.handle.net/10962/d1012576
- Description: Article from the Argus describing Chris McGregor's concert with lots of enthusiasm. The concert was warmly acclaimed and brought together people of all races and ages.
- Full Text:
- Authors: Verdal, Garth
- Language: English
- Type: Article
- Identifier: vital:13664 , http://hdl.handle.net/10962/d1012576
- Description: Article from the Argus describing Chris McGregor's concert with lots of enthusiasm. The concert was warmly acclaimed and brought together people of all races and ages.
- Full Text:
Chris McGregor for city concert
- Authors: Verdal, Garth
- Language: English
- Type: Article
- Identifier: vital:13663 , http://hdl.handle.net/10962/d1012575
- Description: Article from the Supplement to The Argus about Chris McGregor's return to South Africa for a concert at the Carling Jazz Circle Festival. "The pioneer who led the Blue Notes to fame back in the '60s makes his first appearance in SA after 20 years' exile." There is also a close up photo of Chris McGregor with the article.
- Full Text:
- Authors: Verdal, Garth
- Language: English
- Type: Article
- Identifier: vital:13663 , http://hdl.handle.net/10962/d1012575
- Description: Article from the Supplement to The Argus about Chris McGregor's return to South Africa for a concert at the Carling Jazz Circle Festival. "The pioneer who led the Blue Notes to fame back in the '60s makes his first appearance in SA after 20 years' exile." There is also a close up photo of Chris McGregor with the article.
- Full Text:
Transnational civil society's ability to successfully influence state actors on human rights issues through international non-governmental organizations (INGOs) : a case study of the coalition to stop the use of child soldiers
- Authors: VerHage, Alicia
- Date: 2009
- Subjects: International Campaign to Ban Landmines , Convention on the Rights of the Child (1989 November 20) , Non-governmental organizations , Child soldiers , Children's rights , Human rights , Children (International law)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2884 , http://hdl.handle.net/10962/d1015249
- Description: The international dilemma of child soldiers is a humanitarian concern throughout the world. The Coalition to Stop the Use of Child Soldiers (CSUCS) began in 1998 and is currently the leading collaborative movement to address the issue. However, because of its emphasis on a universal 'Straight 18' approach and support of the Optional Protocol of the Convention on the Rights of a Child (CRC), the CSUCS ignores contextual realities that affect the implementation ofthe international legislation and the development of norms concerning child soldiers. This research project will examine the current international nongovernmental organization (INGO) response to child soldiers- focusing on the CSCUS - and formulate suggestions for potential avenues to further INGO involvement with policies and projects. The argument is based on a neoliberal institutionalist platform that argues in favour ofiNGOs' ability to successfully influence actions taken by state actors to address human right issues. Highlighting the successful INGO influence on states during the International Campaign to Ban Landmines, I will present this example as a potential model for the Coalition to Stop the Use of Child Soldiers, and explore the feasibility of this model whilst making suggestions for more effective involvement of INGOs with regard to the issue of child soldiers.
- Full Text:
- Date Issued: 2009
- Authors: VerHage, Alicia
- Date: 2009
- Subjects: International Campaign to Ban Landmines , Convention on the Rights of the Child (1989 November 20) , Non-governmental organizations , Child soldiers , Children's rights , Human rights , Children (International law)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2884 , http://hdl.handle.net/10962/d1015249
- Description: The international dilemma of child soldiers is a humanitarian concern throughout the world. The Coalition to Stop the Use of Child Soldiers (CSUCS) began in 1998 and is currently the leading collaborative movement to address the issue. However, because of its emphasis on a universal 'Straight 18' approach and support of the Optional Protocol of the Convention on the Rights of a Child (CRC), the CSUCS ignores contextual realities that affect the implementation ofthe international legislation and the development of norms concerning child soldiers. This research project will examine the current international nongovernmental organization (INGO) response to child soldiers- focusing on the CSCUS - and formulate suggestions for potential avenues to further INGO involvement with policies and projects. The argument is based on a neoliberal institutionalist platform that argues in favour ofiNGOs' ability to successfully influence actions taken by state actors to address human right issues. Highlighting the successful INGO influence on states during the International Campaign to Ban Landmines, I will present this example as a potential model for the Coalition to Stop the Use of Child Soldiers, and explore the feasibility of this model whilst making suggestions for more effective involvement of INGOs with regard to the issue of child soldiers.
- Full Text:
- Date Issued: 2009
Moving from performance appraisal to performance management at Goldmaster
- Authors: Verhulp, Ian Marc
- Date: 2006
- Subjects: Employees -- Rating of -- South Africa -- Cape Town , Performance standards , Personnel management , Jewelers -- South Africa -- Cape Town
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8750 , http://hdl.handle.net/10948/635 , Employees -- Rating of -- South Africa -- Cape Town , Performance standards , Personnel management , Jewelers -- South Africa -- Cape Town
- Description: Performance management systems help align individual goals and objectives with those of the organisation. The system engages employees and thereby directs them toward achieving the strategic goals of the organisation. The purpose of this research study was to conduct an investigation at a manufacturing jeweller in the Western Cape to establish whether a performance management system would facilitate the achievement of the organisation’s strategic goals and objectives. Preliminary investigations showed that the organisation was using a performance appraisal process which was not effective in facilitating the organisation’s strategic objectives. Based on the initial investigation, this study was undertaken. To achieve the goals of this study, 33 employees of the organisation were presented with a questionnaire based on important key elements of performance management. Responses were received from 31 employees, of which one was from senior management, two from management, three from supervisory staff, and 25 from general staff members. Their responses to the questionnaire were analysed and evaluated and, based on the findings, recommendations were made. The results of the study showed that problems exist in the organisation which impede achievement of its strategic goals. A performance management system would assist the organisation in many of these areas to overcome the identified problems. The results of the study will enable the management of the organisation to design and implement a performance management system to facilitate the achievement of the organisation’s strategic goals.
- Full Text:
- Date Issued: 2006
- Authors: Verhulp, Ian Marc
- Date: 2006
- Subjects: Employees -- Rating of -- South Africa -- Cape Town , Performance standards , Personnel management , Jewelers -- South Africa -- Cape Town
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8750 , http://hdl.handle.net/10948/635 , Employees -- Rating of -- South Africa -- Cape Town , Performance standards , Personnel management , Jewelers -- South Africa -- Cape Town
- Description: Performance management systems help align individual goals and objectives with those of the organisation. The system engages employees and thereby directs them toward achieving the strategic goals of the organisation. The purpose of this research study was to conduct an investigation at a manufacturing jeweller in the Western Cape to establish whether a performance management system would facilitate the achievement of the organisation’s strategic goals and objectives. Preliminary investigations showed that the organisation was using a performance appraisal process which was not effective in facilitating the organisation’s strategic objectives. Based on the initial investigation, this study was undertaken. To achieve the goals of this study, 33 employees of the organisation were presented with a questionnaire based on important key elements of performance management. Responses were received from 31 employees, of which one was from senior management, two from management, three from supervisory staff, and 25 from general staff members. Their responses to the questionnaire were analysed and evaluated and, based on the findings, recommendations were made. The results of the study showed that problems exist in the organisation which impede achievement of its strategic goals. A performance management system would assist the organisation in many of these areas to overcome the identified problems. The results of the study will enable the management of the organisation to design and implement a performance management system to facilitate the achievement of the organisation’s strategic goals.
- Full Text:
- Date Issued: 2006
Development of biological control strategies against sirex noctilio (Fabricius) on Sappi Forests (Ltd) Landholdings in the summer rainfall regions of South Africa
- Authors: Verleur, Peter Marcel
- Date: 2009
- Subjects: Pests -- Biological control -- South Africa , Nonindigenous pests -- Control
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10741 , http://hdl.handle.net/10948/1273 , Pests -- Biological control -- South Africa , Nonindigenous pests -- Control
- Description: The commercial forest industry in South Africa is predominantly dependent on large tracts of exotic monoculture plantations. While this simplifies management practice, there is always the inherent danger posed by introduced pests and diseases. Classical biological control is usually the most effective control method against introduced exotic pests. Climatic factors and seasonal differences may negatively affect the ability of the natural enemies to establish successfully at the new location. Successful establishment of the natural enemies usually results in control over the pest within four years. Sirex noctilio naturally occurs in the mediterranean countries of Europe and North Africa. It is the only member of the Siricid family capable of killing living pine trees. Sirex noctilio was accidentally introduced into New Zealand from Europe during the early 1900s. It has since been found in Australia, Brazil, Argentina South Africa and Chile. Initial biological control in New Zealand and Tasmania was through the release of Siricid specific parasitoid wasps from Europe and North America. The discovery of the accidental introduction of the entomophagous nematode Beddingia siricidicola and its subsequent artificial culturing for release provided the platform for the biological control methodology, which brought the Sirex woodwasp under control. The methods and natural enemies used in New Zealand and Australia were introduced by the South American countries and in the Western Cape of South Africa. Successful biological control was achieved in the Western Cape within two years after the initial introduction of the nematode B. siricidicola. The migration of S. noctilio into the summer rainfall regions of South Africa occurred in the absence of the associated natural enemies. This resulted in rapid population growth of the pest and substantial damage was caused to plantations of Pinus patula in the Eastern Cape and KwaZulu-Natal. Initial attempts at introducing B. siricidicola during 2004 were not very successful. This study contributes to the understanding and adaptation of the biological control methods to the summer rainfall climate. The key finding was that in the summer rainfall climate, only the bottom third of nematode inoculated S. noctilio infested trees produced parasitized adults during the emergence period. A comparative study was done on log samples from S. noctilio infested trees collected in the Western Cape and KwaZulu-Natal. iv An adapted nematode inoculation technique for pulpwood plantations in the summer rainfall regions was developed and implemented in mass inoculations with B. siricidicola during 2007 and 2008. Locally available herbicides were tested for suitability of use in the establishment of trap trees, which would attract ovipositing S. noctilio females in situations where low numbers of the woodwasp occur. Determination of the levels of natural B. siricidicola parasitism in S. noctilio adults during the 2008 emergence period indicate successful establishment of the nematode in KwaZulu-Natal. Successful introduction of the parasitoid wasp Ibalia leucospoides into the summer rainfall regions has also been achieved.
- Full Text:
- Date Issued: 2009
- Authors: Verleur, Peter Marcel
- Date: 2009
- Subjects: Pests -- Biological control -- South Africa , Nonindigenous pests -- Control
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:10741 , http://hdl.handle.net/10948/1273 , Pests -- Biological control -- South Africa , Nonindigenous pests -- Control
- Description: The commercial forest industry in South Africa is predominantly dependent on large tracts of exotic monoculture plantations. While this simplifies management practice, there is always the inherent danger posed by introduced pests and diseases. Classical biological control is usually the most effective control method against introduced exotic pests. Climatic factors and seasonal differences may negatively affect the ability of the natural enemies to establish successfully at the new location. Successful establishment of the natural enemies usually results in control over the pest within four years. Sirex noctilio naturally occurs in the mediterranean countries of Europe and North Africa. It is the only member of the Siricid family capable of killing living pine trees. Sirex noctilio was accidentally introduced into New Zealand from Europe during the early 1900s. It has since been found in Australia, Brazil, Argentina South Africa and Chile. Initial biological control in New Zealand and Tasmania was through the release of Siricid specific parasitoid wasps from Europe and North America. The discovery of the accidental introduction of the entomophagous nematode Beddingia siricidicola and its subsequent artificial culturing for release provided the platform for the biological control methodology, which brought the Sirex woodwasp under control. The methods and natural enemies used in New Zealand and Australia were introduced by the South American countries and in the Western Cape of South Africa. Successful biological control was achieved in the Western Cape within two years after the initial introduction of the nematode B. siricidicola. The migration of S. noctilio into the summer rainfall regions of South Africa occurred in the absence of the associated natural enemies. This resulted in rapid population growth of the pest and substantial damage was caused to plantations of Pinus patula in the Eastern Cape and KwaZulu-Natal. Initial attempts at introducing B. siricidicola during 2004 were not very successful. This study contributes to the understanding and adaptation of the biological control methods to the summer rainfall climate. The key finding was that in the summer rainfall climate, only the bottom third of nematode inoculated S. noctilio infested trees produced parasitized adults during the emergence period. A comparative study was done on log samples from S. noctilio infested trees collected in the Western Cape and KwaZulu-Natal. iv An adapted nematode inoculation technique for pulpwood plantations in the summer rainfall regions was developed and implemented in mass inoculations with B. siricidicola during 2007 and 2008. Locally available herbicides were tested for suitability of use in the establishment of trap trees, which would attract ovipositing S. noctilio females in situations where low numbers of the woodwasp occur. Determination of the levels of natural B. siricidicola parasitism in S. noctilio adults during the 2008 emergence period indicate successful establishment of the nematode in KwaZulu-Natal. Successful introduction of the parasitoid wasp Ibalia leucospoides into the summer rainfall regions has also been achieved.
- Full Text:
- Date Issued: 2009
Sanctus
- Verlosskoor, Composer not specified, Dargie, Dave
- Authors: Verlosskoor , Composer not specified , Dargie, Dave
- Date: 1988
- Subjects: Folk music , Field recordings , Africa, Sub-Saharan , Africa Namibia Gobabis f-sx
- Language: Setswana
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/309449 , vital:59039 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DD117-89
- Description: Catholic choirs performing composition.
- Full Text: false
- Date Issued: 1988
- Authors: Verlosskoor , Composer not specified , Dargie, Dave
- Date: 1988
- Subjects: Folk music , Field recordings , Africa, Sub-Saharan , Africa Namibia Gobabis f-sx
- Language: Setswana
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/309449 , vital:59039 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DD117-89
- Description: Catholic choirs performing composition.
- Full Text: false
- Date Issued: 1988