“As soon as the four sides are all equal, then the angles must be 90° each”: children's misconceptions in geometry
- Atebe, Humphrey U, Schäfer, Marc
- Authors: Atebe, Humphrey U , Schäfer, Marc
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/140983 , vital:37934 , DOI: 10.1080/10288457.2008.10740634
- Description: This study describes Nigerian and South African students' conceptual understanding in high school geometry based on the van Hiele model of geometric thinking levels. The study further highlights students' misconceptions in school geometry. Concepts of triangles and quadrilaterals were investigated among 36 mathematics learners drawn from grades 10 through 12 who participated in this study. The tasks included identifying and naming shapes, sorting of shapes, stating the properties of shapes, defining of shapes and establishing class inclusions of shapes. The results indicated that many Nigerian and South African high school learners in Grade 10, 11 and 12 hold a number of misconceptions about geometric concepts of triangles and quadrilaterals.
- Full Text:
- Date Issued: 2013
- Authors: Atebe, Humphrey U , Schäfer, Marc
- Date: 2013
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/140983 , vital:37934 , DOI: 10.1080/10288457.2008.10740634
- Description: This study describes Nigerian and South African students' conceptual understanding in high school geometry based on the van Hiele model of geometric thinking levels. The study further highlights students' misconceptions in school geometry. Concepts of triangles and quadrilaterals were investigated among 36 mathematics learners drawn from grades 10 through 12 who participated in this study. The tasks included identifying and naming shapes, sorting of shapes, stating the properties of shapes, defining of shapes and establishing class inclusions of shapes. The results indicated that many Nigerian and South African high school learners in Grade 10, 11 and 12 hold a number of misconceptions about geometric concepts of triangles and quadrilaterals.
- Full Text:
- Date Issued: 2013
'Rich man poor man': inter-household and community factors influencing the use of wild plant resources amongst rural households in South Africa
- Cocks, Michelle L, Bangay, Lindsey, Shackleton, Charlie M, Wiersum, K Freerk
- Authors: Cocks, Michelle L , Bangay, Lindsey , Shackleton, Charlie M , Wiersum, K Freerk
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141211 , vital:37953 , DOI: 10.3843/SusDev.15.3:3
- Description: Biodiversity is recognised as an integral part of people's daily livelihoods. This study therefore aims to understand the use of NTFPs at an intricate level by determining what role these resources fulfil in six rural villages and 1011 households' livelihoods. It examines how the use of NTFPs are influenced by intra-household variables, such as wealth and gender, and inter-community variables, such as accessibility to the natural resource. The results reveal that approximately 4453 kg of wild material is used annually per household, of which 1598 kg is used for cultural purposes. The influence of vegetation type and differences between villages are statistically more significant than inter-household variables. At an inter-household level, an increase in the financial status of households did not result in a decrease in the use of natural resources, nor in the quantity of material used.
- Full Text:
- Date Issued: 2010
- Authors: Cocks, Michelle L , Bangay, Lindsey , Shackleton, Charlie M , Wiersum, K Freerk
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/141211 , vital:37953 , DOI: 10.3843/SusDev.15.3:3
- Description: Biodiversity is recognised as an integral part of people's daily livelihoods. This study therefore aims to understand the use of NTFPs at an intricate level by determining what role these resources fulfil in six rural villages and 1011 households' livelihoods. It examines how the use of NTFPs are influenced by intra-household variables, such as wealth and gender, and inter-community variables, such as accessibility to the natural resource. The results reveal that approximately 4453 kg of wild material is used annually per household, of which 1598 kg is used for cultural purposes. The influence of vegetation type and differences between villages are statistically more significant than inter-household variables. At an inter-household level, an increase in the financial status of households did not result in a decrease in the use of natural resources, nor in the quantity of material used.
- Full Text:
- Date Issued: 2010
Does reservoir trophic status influence the feeding and growth of the sharptooth catfish, Clarias gariepinus (Teleostei: Clariidae)?
- Potts, Warren M, Hecht, Thomas, Andrew, Timothy G
- Authors: Potts, Warren M , Hecht, Thomas , Andrew, Timothy G
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124309 , vital:35591 , https://doi.org/10.2989/A JAS.2008.33.2.6.503
- Description: The diet and growth of sharptooth catfish, Clarias gariepinus, in an oligotrophic system (Kat River Reservoir, Eastern Cape, South Africa) were compared to those in a eutrophic system (Laing Reservoir, Eastern Cape) to determine if the trophic status of a waterbody had an effect on the growth rate of the species. In order of importance, the diet of catfish in Kat River Reservoir consisted of fish, insects, zooplankton, plant material and other items, while the diet of catfish in Laing Reservoir consisted of fish, plant material, zooplankton, other vertebrates and insects. The diets of catfish in the two reservoirs had a similarity index of 68.1% and there was no significant difference in their nutritional value. Fish prey was the most important dietary component in both reservoirs. Temperature regime and zooplankton and zoobenthos density were similar in both systems. However, fish prey density was significantly higher in the eutrophic Laing Reservoir and catfish grew significantly faster in that system. The slower growth rate in Kat River Reservoir was attributed to the higher energy costs associated with the capture of fish prey, which was less abundant than in Laing Reservoir. Trophic status therefore had an indirect effect on catfish growth by influencing the availability of fish prey.
- Full Text:
- Date Issued: 2010
- Authors: Potts, Warren M , Hecht, Thomas , Andrew, Timothy G
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124309 , vital:35591 , https://doi.org/10.2989/A JAS.2008.33.2.6.503
- Description: The diet and growth of sharptooth catfish, Clarias gariepinus, in an oligotrophic system (Kat River Reservoir, Eastern Cape, South Africa) were compared to those in a eutrophic system (Laing Reservoir, Eastern Cape) to determine if the trophic status of a waterbody had an effect on the growth rate of the species. In order of importance, the diet of catfish in Kat River Reservoir consisted of fish, insects, zooplankton, plant material and other items, while the diet of catfish in Laing Reservoir consisted of fish, plant material, zooplankton, other vertebrates and insects. The diets of catfish in the two reservoirs had a similarity index of 68.1% and there was no significant difference in their nutritional value. Fish prey was the most important dietary component in both reservoirs. Temperature regime and zooplankton and zoobenthos density were similar in both systems. However, fish prey density was significantly higher in the eutrophic Laing Reservoir and catfish grew significantly faster in that system. The slower growth rate in Kat River Reservoir was attributed to the higher energy costs associated with the capture of fish prey, which was less abundant than in Laing Reservoir. Trophic status therefore had an indirect effect on catfish growth by influencing the availability of fish prey.
- Full Text:
- Date Issued: 2010
Estuarine use by spotted grunter Pomadasys commersonnii in a South African estuary, as determined by acoustic telemetry
- Childs, Amber-Robyn, Cowley, Paul D, Næsje, T F, Booth, Anthony J, Potts, Warren M, Thorstad, Eva B, Økland, F
- Authors: Childs, Amber-Robyn , Cowley, Paul D , Næsje, T F , Booth, Anthony J , Potts, Warren M , Thorstad, Eva B , Økland, F
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124428 , vital:35612 , https://doi.org/10.2989/A JMS.2008.30.1.12.462
- Description: Estuaries are important in the life history and the maintenance of the diversity of coastal fish species because of their function as nursery areas for juveniles as well as feeding grounds for adults (Cyrus 1991). The dependence of many fish species on estuaries is well documented (e.g. Wallace et al. 1984, Lenanton and Potter 1987, Blaber et al. 1989, Whitfield 1990, Hoss and Thayer 1993). Spotted grunter Pomadasys commersonnii (Haemulidae) (Lacepède 1801) is an estuarine-dependent species which spawns in the KwaZulu-Natal inshore coastal waters, between August and December (Wallace 1975b, Wallace and van der Elst 1975, Harris and Cyrus 1997, 1999). The eggs and larvae are transported southwards by the Agulhas Current, and juveniles between 20 mm and 50 mm TL recruit into the KwaZulu-Natal and south-eastern Cape estuaries (Wallace and van der Elst 1975, Whitfield 1990). Juvenile spotted grunter make use of the abundant food resources in estuaries, where they grow rapidly and remain for a period of 1–3 years (Wallace and Schleyer 1979, Day et al. 1981). Upon attaining sexual maturity (at between 300 mm and 400 mm TL), they return to the marine environment (Wallace 1975b). Some adults, however, return to estuaries to feed and to regain condition after spawning (Wallace 1975b, Whitfield 1994). The return of post-spawning fish coincides with increased catches by fishers in estuaries between July and January. These events are known as ‘grunter runs’ (Wallace 1975a, Marais and Baird 1980, Marais 1988, Pradervand and Baird 2002). It is suggested that adults spend up to several months in estuaries, before moving back to sea where they undergo gonadal development and ultimately spawn (Wallace 1975b, Wallace and van der Elst 1975). It is believed that adult fish also enter estuaries in a prespawning state to gain condition en route to their spawning grounds in KwaZulu-Natal (Webb 2002).
- Full Text:
- Date Issued: 2010
- Authors: Childs, Amber-Robyn , Cowley, Paul D , Næsje, T F , Booth, Anthony J , Potts, Warren M , Thorstad, Eva B , Økland, F
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124428 , vital:35612 , https://doi.org/10.2989/A JMS.2008.30.1.12.462
- Description: Estuaries are important in the life history and the maintenance of the diversity of coastal fish species because of their function as nursery areas for juveniles as well as feeding grounds for adults (Cyrus 1991). The dependence of many fish species on estuaries is well documented (e.g. Wallace et al. 1984, Lenanton and Potter 1987, Blaber et al. 1989, Whitfield 1990, Hoss and Thayer 1993). Spotted grunter Pomadasys commersonnii (Haemulidae) (Lacepède 1801) is an estuarine-dependent species which spawns in the KwaZulu-Natal inshore coastal waters, between August and December (Wallace 1975b, Wallace and van der Elst 1975, Harris and Cyrus 1997, 1999). The eggs and larvae are transported southwards by the Agulhas Current, and juveniles between 20 mm and 50 mm TL recruit into the KwaZulu-Natal and south-eastern Cape estuaries (Wallace and van der Elst 1975, Whitfield 1990). Juvenile spotted grunter make use of the abundant food resources in estuaries, where they grow rapidly and remain for a period of 1–3 years (Wallace and Schleyer 1979, Day et al. 1981). Upon attaining sexual maturity (at between 300 mm and 400 mm TL), they return to the marine environment (Wallace 1975b). Some adults, however, return to estuaries to feed and to regain condition after spawning (Wallace 1975b, Whitfield 1994). The return of post-spawning fish coincides with increased catches by fishers in estuaries between July and January. These events are known as ‘grunter runs’ (Wallace 1975a, Marais and Baird 1980, Marais 1988, Pradervand and Baird 2002). It is suggested that adults spend up to several months in estuaries, before moving back to sea where they undergo gonadal development and ultimately spawn (Wallace 1975b, Wallace and van der Elst 1975). It is believed that adult fish also enter estuaries in a prespawning state to gain condition en route to their spawning grounds in KwaZulu-Natal (Webb 2002).
- Full Text:
- Date Issued: 2010
Institutions and economic research: a case of location externalities on agricultural resource allocation in the Kat River basin, South Africa
- Mbatha, Cyril N, Antrobus, Geoffrey G
- Authors: Mbatha, Cyril N , Antrobus, Geoffrey G
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142991 , vital:38183 , DOI: 10.1080/03031853.2013.798069
- Description: The Physical Externality Model is used to illustrate the potential limitations of blindly adopting formal models for economic investigation and explanation in varied geographical contexts. As argued by institutional economists for the last hundred years the practice limits the value and relevance of most general economic inquiry. This model postulates that the geographical location of farmers along a given watercourse, in which water is diverted individually, leads to structural inefficiencies that negatively affect the whole farming community. These effects are felt more severely at downstream sites and lead to a status quo where upstream farmers possess relative economic and political advantages over their counterparts elsewhere. In the study of the Kat River basin these predictions appear to be true only in as far as they relate to legal and political allocations and use of water resources.
- Full Text:
- Date Issued: 2010
- Authors: Mbatha, Cyril N , Antrobus, Geoffrey G
- Date: 2010
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142991 , vital:38183 , DOI: 10.1080/03031853.2013.798069
- Description: The Physical Externality Model is used to illustrate the potential limitations of blindly adopting formal models for economic investigation and explanation in varied geographical contexts. As argued by institutional economists for the last hundred years the practice limits the value and relevance of most general economic inquiry. This model postulates that the geographical location of farmers along a given watercourse, in which water is diverted individually, leads to structural inefficiencies that negatively affect the whole farming community. These effects are felt more severely at downstream sites and lead to a status quo where upstream farmers possess relative economic and political advantages over their counterparts elsewhere. In the study of the Kat River basin these predictions appear to be true only in as far as they relate to legal and political allocations and use of water resources.
- Full Text:
- Date Issued: 2010
Establishment of translocated populations of smallmouth yellowfish, Labeobarbus aeneus (Pisces: Cyprinidae), in lentic and lotic habitats in the Great Fish River system, South Africa
- Weyl, Olaf L F, Stadtlander, Timo, Booth, Anthony J
- Authors: Weyl, Olaf L F , Stadtlander, Timo , Booth, Anthony J
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124418 , vital:35607 , https://doi.org/10.3377/004.044.0109
- Description: As a result of numerous introductions and translocations of fishes, South Africa has recently been identified as a fish invasion hotspot (Leprieur et al. 2008). In freshwater ecosystems invasion by alien species is considered a leading mechanism driving environmental change (Clavero & Garcia- Berthou 2005; Garcia-Berthou et al. 2005). In South Africa, documented effects of fish invasions include the extirpation of indigenous fishes through predation (Cambray 2003), changes in invertebrate community structure (Lowe et al. 2008) and hybridization (Canonico et al. 2005). As a result, the management of alien species is a high national priority (National Environmental Management: Biodiversity Act 2004). Such management requires an understanding of the biology, ecology and establishment success of fishes outside their native range.
- Full Text:
- Date Issued: 2009
- Authors: Weyl, Olaf L F , Stadtlander, Timo , Booth, Anthony J
- Date: 2009
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124418 , vital:35607 , https://doi.org/10.3377/004.044.0109
- Description: As a result of numerous introductions and translocations of fishes, South Africa has recently been identified as a fish invasion hotspot (Leprieur et al. 2008). In freshwater ecosystems invasion by alien species is considered a leading mechanism driving environmental change (Clavero & Garcia- Berthou 2005; Garcia-Berthou et al. 2005). In South Africa, documented effects of fish invasions include the extirpation of indigenous fishes through predation (Cambray 2003), changes in invertebrate community structure (Lowe et al. 2008) and hybridization (Canonico et al. 2005). As a result, the management of alien species is a high national priority (National Environmental Management: Biodiversity Act 2004). Such management requires an understanding of the biology, ecology and establishment success of fishes outside their native range.
- Full Text:
- Date Issued: 2009
A Bernsteinian analysis of the integration of natural resource management in the curriculum of a rural disadvantaged school
- Authors: Nsubuga, Yvonne
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386415 , vital:68139 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122771"
- Description: Knowledge integration is one of the key principles that underpin curriculum reform in post-apartheid South Africa. One form of teacher support that has been adopted in South Africa is to provide schools throughout the country with samples of pedagogic texts such as curriculum documents and examination exemplars to act as guidelines to teachers as they implement this new curriculum requirement. In the isolated and under-resourced rural schools of South Africa, these texts are the main form of curriculum guidance to teachers. Hence the knowledge integration principles and messages conveyed within these texts are of crucial importance. One contributory factor to the lack of information on knowledge integration at rural underresourced schools is the lack of simple and effective research tools by which to analyse and compare the extent of knowledge integration within pedagogic texts and classroom practices. This article reports on a Bernstein informed analysis that was carried out on three different Grade 10 Life Sciences pedagogic texts in order to assess the extent to which they integrate natural resource management (NRM). The study involved the construction of two indicator frameworks as the research tools with which the analysis was conducted. Results from the analysis showed that although the official Grade 10 Life Sciences pedagogic texts contained very high levels of NRM integration, this was not the case for the Grade 10 Life Sciences text that was produced at the school level. The study provides useful insight into curriculum recontextualisation at a rural under-resourced school through the lens of NRM integration within the Grade 10 Life Sciences pedagogic texts. Such insight has the potential to contribute to better curriculum design and implementation strategies to service schools. This will hopefully help to narrow the gap that currently exists between the official and enacted curricula.
- Full Text:
- Date Issued: 2008
- Authors: Nsubuga, Yvonne
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/386415 , vital:68139 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/122771"
- Description: Knowledge integration is one of the key principles that underpin curriculum reform in post-apartheid South Africa. One form of teacher support that has been adopted in South Africa is to provide schools throughout the country with samples of pedagogic texts such as curriculum documents and examination exemplars to act as guidelines to teachers as they implement this new curriculum requirement. In the isolated and under-resourced rural schools of South Africa, these texts are the main form of curriculum guidance to teachers. Hence the knowledge integration principles and messages conveyed within these texts are of crucial importance. One contributory factor to the lack of information on knowledge integration at rural underresourced schools is the lack of simple and effective research tools by which to analyse and compare the extent of knowledge integration within pedagogic texts and classroom practices. This article reports on a Bernstein informed analysis that was carried out on three different Grade 10 Life Sciences pedagogic texts in order to assess the extent to which they integrate natural resource management (NRM). The study involved the construction of two indicator frameworks as the research tools with which the analysis was conducted. Results from the analysis showed that although the official Grade 10 Life Sciences pedagogic texts contained very high levels of NRM integration, this was not the case for the Grade 10 Life Sciences text that was produced at the school level. The study provides useful insight into curriculum recontextualisation at a rural under-resourced school through the lens of NRM integration within the Grade 10 Life Sciences pedagogic texts. Such insight has the potential to contribute to better curriculum design and implementation strategies to service schools. This will hopefully help to narrow the gap that currently exists between the official and enacted curricula.
- Full Text:
- Date Issued: 2008
A Canonical Implementation Of The Advanced Encryption Standard On The Graphics Processing Unit
- Pilkington, Nick, Irwin, Barry V W
- Authors: Pilkington, Nick , Irwin, Barry V W
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430007 , vital:72659 , https://digifors.cs.up.ac.za/issa/2008/Proceedings/Research/47.pdf
- Description: This paper will present an implementation of the Advanced Encryption Standard (AES) on the graphics processing unit (GPU). It investigates the ease of implementation from first principles and the difficulties encountered. It also presents a performance analysis to evaluate if the GPU is a viable option for a cryptographics platform. The AES implementation is found to yield orders of maginitude increased performance when compared to CPU based implementations. Although the implementation introduces complica-tions, these are quickly becoming mitigated by the growing accessibility pro-vided by general programming on graphics processing units (GPGPU) frameworks like NVIDIA’s Compute Uniform Device Architechture (CUDA) and AMD/ATI’s Close to Metal (CTM).
- Full Text:
- Date Issued: 2008
- Authors: Pilkington, Nick , Irwin, Barry V W
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430007 , vital:72659 , https://digifors.cs.up.ac.za/issa/2008/Proceedings/Research/47.pdf
- Description: This paper will present an implementation of the Advanced Encryption Standard (AES) on the graphics processing unit (GPU). It investigates the ease of implementation from first principles and the difficulties encountered. It also presents a performance analysis to evaluate if the GPU is a viable option for a cryptographics platform. The AES implementation is found to yield orders of maginitude increased performance when compared to CPU based implementations. Although the implementation introduces complica-tions, these are quickly becoming mitigated by the growing accessibility pro-vided by general programming on graphics processing units (GPGPU) frameworks like NVIDIA’s Compute Uniform Device Architechture (CUDA) and AMD/ATI’s Close to Metal (CTM).
- Full Text:
- Date Issued: 2008
A Grid-Based Approach to the Remote Control and Recall of the Properties of IEEE1394 Audio Devices
- Foss, Richard, Foulkes, Phillip
- Authors: Foss, Richard , Foulkes, Phillip
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/427212 , vital:72422 , https://www.aes.org/e-lib/browse.cfm?elib=14453
- Description: Typically, the configuration of audio hardware and software is not integrated. This paper discusses a software system that has been developed to remotely control and recall the properties of IEEE1394 (FireWire) audio devices via a series of graphical routing matrices. The software presents sound engineers with a graphical routing matrix that shows, along its axes, the available FireWire audio devices on a FireWire network. Inter device connection management may be performed by selecting the cross points on the grid, and intra device control may be performed via device editors that are displayed via the axes of the matrix. The software application may be hosted by a compatible Digital Audio Workstation (DAW) application to allow for the storing and recalling of the various properties associated with the devices.
- Full Text:
- Date Issued: 2008
- Authors: Foss, Richard , Foulkes, Phillip
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/427212 , vital:72422 , https://www.aes.org/e-lib/browse.cfm?elib=14453
- Description: Typically, the configuration of audio hardware and software is not integrated. This paper discusses a software system that has been developed to remotely control and recall the properties of IEEE1394 (FireWire) audio devices via a series of graphical routing matrices. The software presents sound engineers with a graphical routing matrix that shows, along its axes, the available FireWire audio devices on a FireWire network. Inter device connection management may be performed by selecting the cross points on the grid, and intra device control may be performed via device editors that are displayed via the axes of the matrix. The software application may be hosted by a compatible Digital Audio Workstation (DAW) application to allow for the storing and recalling of the various properties associated with the devices.
- Full Text:
- Date Issued: 2008
A survey of fruit-feeding insects and their parasitoids occurring on wild olives, Olea europaea ssp. cuspidata, in the Eastern Cape of South Africa
- Mkize, Nolwazi, Hoelmer, Kim A, Villet, Martin H
- Authors: Mkize, Nolwazi , Hoelmer, Kim A , Villet, Martin H
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441694 , vital:73907 , https://doi.org/10.1080/09583150802450154
- Description: Fruits of wild olives, Olea europaea ssp. cuspidata (Wall. ex G. Don) Cif., were collected in the Eastern Cape, South Africa, during 2003–2005 to quantify levels of fruit-infesting pests and their parasitoids. Two species of Tephritidae, Bactrocera oleae (Rossi) and B. biguttula (Bezzi), were the most abundant insects recovered and were reared from most samples. Fruit infestation rates by the Bactrocera spp. were generally below 8% and over half of the infestations were under 1%. When parasitism occurred in samples with flies, levels ranged from 7 to 83%. Several species of opiine braconid wasps, Psyttalia concolor (Szépligeti), Psyttalia lounsburyi (Silvestri), and Utetes africanus (Szépligeti) and one braconine wasp, Bracon celer Szépligeti, were reared from fruits containing B. oleae and/or B. biguttula. Chalcidoid parasitoids and seed wasps included seven species of Eurytomidae (Eurytoma oleae, Eurytoma sp., and Sycophila sp.), Ormyridae (Ormyrus sp.), Torymidae (Megastigmus sp.), and Eupelmidae (Eupelmus afer and E. spermophilus). One species of moth, Palpita unionalis (Hübner) (Crambidae), was recovered in very low numbers and without parasitoids. The survey results indicate that fruit flies might not become economic pests of the nascent commercial olive industry in the Eastern Cape, and the small numbers present may be controlled to a considerable level by natural enemies.
- Full Text:
- Date Issued: 2008
- Authors: Mkize, Nolwazi , Hoelmer, Kim A , Villet, Martin H
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/441694 , vital:73907 , https://doi.org/10.1080/09583150802450154
- Description: Fruits of wild olives, Olea europaea ssp. cuspidata (Wall. ex G. Don) Cif., were collected in the Eastern Cape, South Africa, during 2003–2005 to quantify levels of fruit-infesting pests and their parasitoids. Two species of Tephritidae, Bactrocera oleae (Rossi) and B. biguttula (Bezzi), were the most abundant insects recovered and were reared from most samples. Fruit infestation rates by the Bactrocera spp. were generally below 8% and over half of the infestations were under 1%. When parasitism occurred in samples with flies, levels ranged from 7 to 83%. Several species of opiine braconid wasps, Psyttalia concolor (Szépligeti), Psyttalia lounsburyi (Silvestri), and Utetes africanus (Szépligeti) and one braconine wasp, Bracon celer Szépligeti, were reared from fruits containing B. oleae and/or B. biguttula. Chalcidoid parasitoids and seed wasps included seven species of Eurytomidae (Eurytoma oleae, Eurytoma sp., and Sycophila sp.), Ormyridae (Ormyrus sp.), Torymidae (Megastigmus sp.), and Eupelmidae (Eupelmus afer and E. spermophilus). One species of moth, Palpita unionalis (Hübner) (Crambidae), was recovered in very low numbers and without parasitoids. The survey results indicate that fruit flies might not become economic pests of the nascent commercial olive industry in the Eastern Cape, and the small numbers present may be controlled to a considerable level by natural enemies.
- Full Text:
- Date Issued: 2008
A symptom that defies analysis: is this simply xenophobia?.
- Authors: Kyazze, Sim
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159337 , vital:40289 , https://hdl.handle.net/10520/EJC140106
- Description: On 29 January 29 2007 I travelled on an SAA flight from Entebbe International Airport in Uganda to OR Tambo International in Johannesburg. Somehow, I had forgotten, ignored or failed to travel with my Yellow Fever Certificate and an Immigration Officer let me have it.
- Full Text:
- Date Issued: 2008
- Authors: Kyazze, Sim
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159337 , vital:40289 , https://hdl.handle.net/10520/EJC140106
- Description: On 29 January 29 2007 I travelled on an SAA flight from Entebbe International Airport in Uganda to OR Tambo International in Johannesburg. Somehow, I had forgotten, ignored or failed to travel with my Yellow Fever Certificate and an Immigration Officer let me have it.
- Full Text:
- Date Issued: 2008
A tuple space web service for distributed programming-Simplifying distributed web services applications
- Wells, George C, Mueller, Barbara, Schulé, Lo¨ıc
- Authors: Wells, George C , Mueller, Barbara , Schulé, Lo¨ıc
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430437 , vital:72691 , https://www.scitepress.org/PublishedPapers/2008/15170/15170.pdf
- Description: This paper describes a new tuple space web service for coordination and communication in distributed web applications. This web service is based on the Linda programming model. Linda is a coordination lan-guage for parallel and distributed processing, providing a communica-tion mechanism based on a logically shared memory space. The origi-nal Linda model has been extended through the provision of a pro-grammable mechanism, providing additional flexibility and improved performance. The implementation of the web service is discussed, to-gether with the details of the programmable matching mechanism. Some results from the implementation of a location-based mobile appli-cation, using the tuple space web service are presented, demonstrating the benefits of our system.
- Full Text:
- Date Issued: 2008
- Authors: Wells, George C , Mueller, Barbara , Schulé, Lo¨ıc
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/430437 , vital:72691 , https://www.scitepress.org/PublishedPapers/2008/15170/15170.pdf
- Description: This paper describes a new tuple space web service for coordination and communication in distributed web applications. This web service is based on the Linda programming model. Linda is a coordination lan-guage for parallel and distributed processing, providing a communica-tion mechanism based on a logically shared memory space. The origi-nal Linda model has been extended through the provision of a pro-grammable mechanism, providing additional flexibility and improved performance. The implementation of the web service is discussed, to-gether with the details of the programmable matching mechanism. Some results from the implementation of a location-based mobile appli-cation, using the tuple space web service are presented, demonstrating the benefits of our system.
- Full Text:
- Date Issued: 2008
Adoption of ICTs in a marginalised area of South Africa
- Mapi, Thandeka, Dalvit, Lorenzo, Terzoli, Alfredo
- Authors: Mapi, Thandeka , Dalvit, Lorenzo , Terzoli, Alfredo
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431130 , vital:72747 , https://d1wqtxts1xzle7.cloudfront.net/4390301/5-thandeka-libre.pdf?1390837024=response-content-disposi-tion=inline%3B+filename%3DAdoption_of_ICTs_in_a_Marginalised_Area.pdfExpires=1714988863Signature=N683m3iYa8BDSsrNBb-fZpYmsy~pftZZQbiEdNz8ZFJaL2I-Wt32FIJcLEKFnrSjj0AfnYak4RVZjuZhuFVHQZOnkt7tIBBwccqexeEkwq94rCX6r1~aA~GdyL4Z3WzHRK~Xoug17mnu869TGq8VxuSNBf-LmbSr03uZeXlk2dpobbp3ROl06wauhLm02p1th1qBM5n-Bc0q8wYS-zkY-jA9fc7w6ZE~m6hlHE6Amt1xg~db99oRcu1EuXSdHyWDZDw3OsQ9zlMfX7AU6EBhfAtFbxXuVXOlNOEPuXHgiQ1UbFveqfVKGFRg0dmYXzw62MQM0EQQ2g4qXgk2Xc2z0cQ__Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
- Description: This paper examines how a community in Dwesa, a marginalised area in the Transkei Region of the Eastern Cape, South Africa, adopts Information and Communication Technologies (ICTs). This research is part of the Siyakhula project, which aims at promoting the potential of the area through ICTs. The project is situated in four different schools: Mpume, Nondobo, Mtokwane and Ngwane. Fostering ICT awareness and a sense of owner-ship by the community are seen as crucial factors, and computer literacy education is an integral part of the project. The study focuses on how di-verse groups of people adopt new technologies and approach ICT educa-tion. Qualitative research methods such as Participatory Action Research (PAR) and Participant Observation (PO) were adopted in the study.
- Full Text:
- Date Issued: 2008
- Authors: Mapi, Thandeka , Dalvit, Lorenzo , Terzoli, Alfredo
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/431130 , vital:72747 , https://d1wqtxts1xzle7.cloudfront.net/4390301/5-thandeka-libre.pdf?1390837024=response-content-disposi-tion=inline%3B+filename%3DAdoption_of_ICTs_in_a_Marginalised_Area.pdfExpires=1714988863Signature=N683m3iYa8BDSsrNBb-fZpYmsy~pftZZQbiEdNz8ZFJaL2I-Wt32FIJcLEKFnrSjj0AfnYak4RVZjuZhuFVHQZOnkt7tIBBwccqexeEkwq94rCX6r1~aA~GdyL4Z3WzHRK~Xoug17mnu869TGq8VxuSNBf-LmbSr03uZeXlk2dpobbp3ROl06wauhLm02p1th1qBM5n-Bc0q8wYS-zkY-jA9fc7w6ZE~m6hlHE6Amt1xg~db99oRcu1EuXSdHyWDZDw3OsQ9zlMfX7AU6EBhfAtFbxXuVXOlNOEPuXHgiQ1UbFveqfVKGFRg0dmYXzw62MQM0EQQ2g4qXgk2Xc2z0cQ__Key-Pair-Id=APKAJLOHF5GGSLRBV4ZA
- Description: This paper examines how a community in Dwesa, a marginalised area in the Transkei Region of the Eastern Cape, South Africa, adopts Information and Communication Technologies (ICTs). This research is part of the Siyakhula project, which aims at promoting the potential of the area through ICTs. The project is situated in four different schools: Mpume, Nondobo, Mtokwane and Ngwane. Fostering ICT awareness and a sense of owner-ship by the community are seen as crucial factors, and computer literacy education is an integral part of the project. The study focuses on how di-verse groups of people adopt new technologies and approach ICT educa-tion. Qualitative research methods such as Participatory Action Research (PAR) and Participant Observation (PO) were adopted in the study.
- Full Text:
- Date Issued: 2008
Adsorption of 4-nitrophenol onto Amberlite® IRA-900 modified with metallophthalocyanines
- Marais, Eloïse, Nyokong, Tebello
- Authors: Marais, Eloïse , Nyokong, Tebello
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/268576 , vital:54211 , xlink:href="https://doi.org/10.1016/j.jhazmat.2007.06.096"
- Description: The adsorption of 4-nitrophenol using commercially available Amberlite® IRA-900 modified with metal phthalocyanines (MPc) was investigated. The metallophthalocyanines immobilised onto the surface of Amberlite® IRA-900 include Fe (FePcS4), Co (CoPcS4) and Ni (NiPcS4) tetrasulphophthalocyanines, and differently sulphonated phthalocyanine mixtures of Fe (FePcSmix), Co (CoPcSmix) and Ni (NiPcSmix). Adsorption rates were fastest for the modified adsorbents at a loading of 1 × 10−3 g MPc/g Amberlite, at pH 9. The highest amount of 4-NP removal was obtained on FePcSmix modified Amberlite® IRA-900 with Qt = 42.9 mmol g−1 and adsorption efficiency of 86%. The recovery efficiency of 4-NP within 150 min was 76%. Using the Langmuir–Hinshelwood kinetic model, the complexes showed an order of 4-nitrophenol adsorption to be as follows: CoPcSmix > NiPcS4 > NiPcSmix > FePcS4 > FePcSmix > CoPcS4. The MPc modified Amberlite® IRA-900 was used repeatedly, following removal of 4-NP by nitric acid, without any significant loss of activity.
- Full Text:
- Date Issued: 2008
- Authors: Marais, Eloïse , Nyokong, Tebello
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/268576 , vital:54211 , xlink:href="https://doi.org/10.1016/j.jhazmat.2007.06.096"
- Description: The adsorption of 4-nitrophenol using commercially available Amberlite® IRA-900 modified with metal phthalocyanines (MPc) was investigated. The metallophthalocyanines immobilised onto the surface of Amberlite® IRA-900 include Fe (FePcS4), Co (CoPcS4) and Ni (NiPcS4) tetrasulphophthalocyanines, and differently sulphonated phthalocyanine mixtures of Fe (FePcSmix), Co (CoPcSmix) and Ni (NiPcSmix). Adsorption rates were fastest for the modified adsorbents at a loading of 1 × 10−3 g MPc/g Amberlite, at pH 9. The highest amount of 4-NP removal was obtained on FePcSmix modified Amberlite® IRA-900 with Qt = 42.9 mmol g−1 and adsorption efficiency of 86%. The recovery efficiency of 4-NP within 150 min was 76%. Using the Langmuir–Hinshelwood kinetic model, the complexes showed an order of 4-nitrophenol adsorption to be as follows: CoPcSmix > NiPcS4 > NiPcSmix > FePcS4 > FePcSmix > CoPcS4. The MPc modified Amberlite® IRA-900 was used repeatedly, following removal of 4-NP by nitric acid, without any significant loss of activity.
- Full Text:
- Date Issued: 2008
An Analysis of Network Scanning Traffic as it relates to Scan-Detection in Network Intrusion Detection Systems
- Barnett, Richard J, Irwin, Barry V W
- Authors: Barnett, Richard J , Irwin, Barry V W
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428156 , vital:72490 , https://www.researchgate.net/profile/Barry-Ir-win/publication/326225058_An_Analysis_of_Network_Scanning_Traffic_as_it_relates_to_Scan-Detec-tion_in_Network_Intrusion_Detection_Systems/links/5b3f21eaa6fdcc8506ffe659/An-Analysis-of-Network-Scanning-Traffic-as-it-relates-to-Scan-Detection-in-Network-Intrusion-Detection-Systems.pdf
- Description: Network Intrusion Detection is, in a modern network, a useful tool to de-tect a wide variety of malicious traffic. The ever present prevalence of scanning activity on the Internet is fair justification to warrant scan de-tection as a component of network intrusion detection. Whilst current systems are able to perform scan-detection, the methods they use are often flawed and exhibit an inability to detect scans in an efficient and scalable manner. Existing research by van Riel and Irwin has illustrated a number of flaws present in the open source systems Snort and Bro. This paper builds on this by describing current research at Rhodes Uni-versity in which these flaws are being addressed. In particular, this re-search will address the flaws in the scan-detection engines in Snort and Bro by developing new plug-ins for these systems which take into con-sideration the improvements which are identified over the course of the research.
- Full Text:
- Date Issued: 2008
- Authors: Barnett, Richard J , Irwin, Barry V W
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428156 , vital:72490 , https://www.researchgate.net/profile/Barry-Ir-win/publication/326225058_An_Analysis_of_Network_Scanning_Traffic_as_it_relates_to_Scan-Detec-tion_in_Network_Intrusion_Detection_Systems/links/5b3f21eaa6fdcc8506ffe659/An-Analysis-of-Network-Scanning-Traffic-as-it-relates-to-Scan-Detection-in-Network-Intrusion-Detection-Systems.pdf
- Description: Network Intrusion Detection is, in a modern network, a useful tool to de-tect a wide variety of malicious traffic. The ever present prevalence of scanning activity on the Internet is fair justification to warrant scan de-tection as a component of network intrusion detection. Whilst current systems are able to perform scan-detection, the methods they use are often flawed and exhibit an inability to detect scans in an efficient and scalable manner. Existing research by van Riel and Irwin has illustrated a number of flaws present in the open source systems Snort and Bro. This paper builds on this by describing current research at Rhodes Uni-versity in which these flaws are being addressed. In particular, this re-search will address the flaws in the scan-detection engines in Snort and Bro by developing new plug-ins for these systems which take into con-sideration the improvements which are identified over the course of the research.
- Full Text:
- Date Issued: 2008
An Evaluation Of Scan-Detection Algorithms In Network Intrusion Detection Systems
- Barnett, Richard J, Irwin, Barry V W
- Authors: Barnett, Richard J , Irwin, Barry V W
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428701 , vital:72530 , https://digifors.cs.up.ac.za/issa/2008/Proceedings/Research/29.pdf
- Description: Network Intrusion Detection Systems are becoming more prevalent as devices to protect a network. However, the methods they use for some forms of detection are flawed. This paper builds upon existing research by van Riel and Irwin which illustrated these flaws in Snort and Bro's scan-detection engines. Indeed, it has been ascertained that a number of different scanning techniques are not identified by either Snort or Bro. This paper highlights current research into the improvement of these scan detection algorithms and presents insight into how this re-search is being conducted at Rhodes University. This research will im-prove on the scan detection engines in Snort and Bro, permitting them to be used in a production environment without fear of succumbing to the false negative problem which currently exists.
- Full Text:
- Date Issued: 2008
- Authors: Barnett, Richard J , Irwin, Barry V W
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428701 , vital:72530 , https://digifors.cs.up.ac.za/issa/2008/Proceedings/Research/29.pdf
- Description: Network Intrusion Detection Systems are becoming more prevalent as devices to protect a network. However, the methods they use for some forms of detection are flawed. This paper builds upon existing research by van Riel and Irwin which illustrated these flaws in Snort and Bro's scan-detection engines. Indeed, it has been ascertained that a number of different scanning techniques are not identified by either Snort or Bro. This paper highlights current research into the improvement of these scan detection algorithms and presents insight into how this re-search is being conducted at Rhodes University. This research will im-prove on the scan detection engines in Snort and Bro, permitting them to be used in a production environment without fear of succumbing to the false negative problem which currently exists.
- Full Text:
- Date Issued: 2008
An investigation into electronic-source plagiarism in a first-year essay assignment
- Authors: Ellery, Karen
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70114 , vital:29621 , https://doi.org/10.1080/02602930701772788
- Description: Since the emergence of the electronic era, plagiarism has become an increasingly prevalent problem at tertiary institutions. This study investigated the role electronic sources of information played in influencing plagiarism in an essay assignment in a first-year geography module at the University of KwaZulu-Natal in South Africa. Despite explicit instruction in tutorials on academic writing, referencing and plagiarism, a quarter of students still plagiarised in their essay, with the majority having done so off the Internet. A survey questionnaire and interviews revealed that not only did the school writing experience prepare students poorly for academic writing discourses, but also highlighted that student ignorance with regard to acknowledgement of electronic sources, a pervasive perception of difference between electronic and print sources, as well as the availability of the copy-and-paste facility which reinforces the product view of writing, all contributed towards electronic-source plagiarism. Active instructional engagement with electronic-source material, and open dialogue on ownership of knowledge as well as on moral and ethical issues with students, are recommended as strategies to overcome such plagiarism.
- Full Text:
- Date Issued: 2008
- Authors: Ellery, Karen
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/70114 , vital:29621 , https://doi.org/10.1080/02602930701772788
- Description: Since the emergence of the electronic era, plagiarism has become an increasingly prevalent problem at tertiary institutions. This study investigated the role electronic sources of information played in influencing plagiarism in an essay assignment in a first-year geography module at the University of KwaZulu-Natal in South Africa. Despite explicit instruction in tutorials on academic writing, referencing and plagiarism, a quarter of students still plagiarised in their essay, with the majority having done so off the Internet. A survey questionnaire and interviews revealed that not only did the school writing experience prepare students poorly for academic writing discourses, but also highlighted that student ignorance with regard to acknowledgement of electronic sources, a pervasive perception of difference between electronic and print sources, as well as the availability of the copy-and-paste facility which reinforces the product view of writing, all contributed towards electronic-source plagiarism. Active instructional engagement with electronic-source material, and open dialogue on ownership of knowledge as well as on moral and ethical issues with students, are recommended as strategies to overcome such plagiarism.
- Full Text:
- Date Issued: 2008
An Investigation into the Performance of General Sorting on Graphics Processing Units
- Pilkington, Nick, Irwin, Barry V W
- Authors: Pilkington, Nick , Irwin, Barry V W
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429881 , vital:72648 , https://doi.org/10.1007/978-1-4020-8741-7_65
- Description: Sorting is a fundamental operation in computing and there is a constant need to push the boundaries of performance with different sorting algo-rithms. With the advent of the programmable graphics pipeline, the par-allel nature of graphics processing units has been exposed allowing programmers to take advantage of it. By transforming the way that data is represented and operated on parallel sorting algorithms can be im-plemented on graphics processing units where previously only graphics processing could be performed. This paradigm of programming exhibits potentially large speedups for algorithms.
- Full Text:
- Date Issued: 2008
- Authors: Pilkington, Nick , Irwin, Barry V W
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/429881 , vital:72648 , https://doi.org/10.1007/978-1-4020-8741-7_65
- Description: Sorting is a fundamental operation in computing and there is a constant need to push the boundaries of performance with different sorting algo-rithms. With the advent of the programmable graphics pipeline, the par-allel nature of graphics processing units has been exposed allowing programmers to take advantage of it. By transforming the way that data is represented and operated on parallel sorting algorithms can be im-plemented on graphics processing units where previously only graphics processing could be performed. This paradigm of programming exhibits potentially large speedups for algorithms.
- Full Text:
- Date Issued: 2008
An open service delivery platform for adding value to softswitch-based telephony environments
- Tsietsi, Mosiuoa, Terzoli, Alfredo, Wells, George C
- Authors: Tsietsi, Mosiuoa , Terzoli, Alfredo , Wells, George C
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428450 , vital:72512 , https://www.researchgate.net/profile/Alfredo-Ter-zoli/publication/251923990_An_open_service_delivery_platform_for_adding_value_to_softswitch-based_telephony_environments/links/0c9605298fdf0ef8d3000000/An-open-service-delivery-platform-for-adding-value-to-softswitch-based-telephony-environments.pdf
- Description: Softswitches have played a crucial role in next generation networks (NGNs) not only as the primary agents responsible for controlling the data and media paths between endpoints, but also as hosts of telepho-ny applications such as billing and legal intercept. Even though very useful and flexible application interfaces have been used to program these softswitches, there is much benefit that can be derived from de-coupling the application layer from the switching core. NGN architec-tures such as the IP Multimedia Subsystem (IMS) have borrowed the concept of an application server from the IT domain in order to deliver enhanced services to the network. This paper describes an initial inves-tigation into the development of a service delivery platform (SDP) based on the JAIN Service Logic and Execution Environment (JSLEE) indus-try standard, to provide advanced services that can be deployed over a telephony environment called iLanga, which is based on the open source software PBX named Asterisk.
- Full Text:
- Date Issued: 2008
- Authors: Tsietsi, Mosiuoa , Terzoli, Alfredo , Wells, George C
- Date: 2008
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/428450 , vital:72512 , https://www.researchgate.net/profile/Alfredo-Ter-zoli/publication/251923990_An_open_service_delivery_platform_for_adding_value_to_softswitch-based_telephony_environments/links/0c9605298fdf0ef8d3000000/An-open-service-delivery-platform-for-adding-value-to-softswitch-based-telephony-environments.pdf
- Description: Softswitches have played a crucial role in next generation networks (NGNs) not only as the primary agents responsible for controlling the data and media paths between endpoints, but also as hosts of telepho-ny applications such as billing and legal intercept. Even though very useful and flexible application interfaces have been used to program these softswitches, there is much benefit that can be derived from de-coupling the application layer from the switching core. NGN architec-tures such as the IP Multimedia Subsystem (IMS) have borrowed the concept of an application server from the IT domain in order to deliver enhanced services to the network. This paper describes an initial inves-tigation into the development of a service delivery platform (SDP) based on the JAIN Service Logic and Execution Environment (JSLEE) indus-try standard, to provide advanced services that can be deployed over a telephony environment called iLanga, which is based on the open source software PBX named Asterisk.
- Full Text:
- Date Issued: 2008
Arthropod Fauna of the UAE, Vol. 1, A. van Harten (Ed.): book review
- Authors: Villet, Martin H
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/451612 , vital:75064 , https://hdl.handle.net/10520/EJC32768
- Description: This book is a richly illustrated synthesis and development of knowledge on the wide range of plant-insect associations that has been observed in several collections of Cretaceous megafloras from the Negev of Israel.
- Full Text:
- Date Issued: 2008
- Authors: Villet, Martin H
- Date: 2008
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/451612 , vital:75064 , https://hdl.handle.net/10520/EJC32768
- Description: This book is a richly illustrated synthesis and development of knowledge on the wide range of plant-insect associations that has been observed in several collections of Cretaceous megafloras from the Negev of Israel.
- Full Text:
- Date Issued: 2008