Bacterial degradation of the acaricide amitraz
- Authors: Baker, Penelope Bridget
- Date: 1976
- Subjects: Acaricides , Biodegradation , Gas chromatography , Bacteriology -- Cultures and culture media
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4099 , http://hdl.handle.net/10962/d1009498
- Description: This thesis describes dip tank field trials and laboratory investigations on the acaricide Amitraz. Amitraz is a triazapenta- diene compound which is relatively unstable in fouled dip washes. The field trials were conducted on the farm Sea View according to the "Total Replacement Method" and on the farm Sea Ways according to the "Lime Stabilization Method" of dipping. The results of these trials showed that Amitraz was stable in clean dip washes, and under conditions of high pH resulting from the addition of slaked lime to the dip wash. Using mixed bacterial populations optimum conditions for degradation of Amitraz in the laboratory were determined. Bacterial cultures degraded Amitraz most efficiently in media supplemented with yeast extract or with a high content of sterile cattle faeces. Amitraz concentrations were determined by gas chromatography. A culture. efficient at degrading Amitraz was enriched from a dip tank sludge inoculum. From this culture ten bacterial isolates were identified; nine of these were of the genus Pseudomonas and one was an Achromobacter sp. Experiments with both mixed and pure cultures demonstrated that bacterial degradation of Amitraz was by the process of co-metabolism. The existence of four degradation products was shown using thin layer chromatography. Tentative identification of two of the products was made.
- Full Text:
- Date Issued: 1976
- Authors: Baker, Penelope Bridget
- Date: 1976
- Subjects: Acaricides , Biodegradation , Gas chromatography , Bacteriology -- Cultures and culture media
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4099 , http://hdl.handle.net/10962/d1009498
- Description: This thesis describes dip tank field trials and laboratory investigations on the acaricide Amitraz. Amitraz is a triazapenta- diene compound which is relatively unstable in fouled dip washes. The field trials were conducted on the farm Sea View according to the "Total Replacement Method" and on the farm Sea Ways according to the "Lime Stabilization Method" of dipping. The results of these trials showed that Amitraz was stable in clean dip washes, and under conditions of high pH resulting from the addition of slaked lime to the dip wash. Using mixed bacterial populations optimum conditions for degradation of Amitraz in the laboratory were determined. Bacterial cultures degraded Amitraz most efficiently in media supplemented with yeast extract or with a high content of sterile cattle faeces. Amitraz concentrations were determined by gas chromatography. A culture. efficient at degrading Amitraz was enriched from a dip tank sludge inoculum. From this culture ten bacterial isolates were identified; nine of these were of the genus Pseudomonas and one was an Achromobacter sp. Experiments with both mixed and pure cultures demonstrated that bacterial degradation of Amitraz was by the process of co-metabolism. The existence of four degradation products was shown using thin layer chromatography. Tentative identification of two of the products was made.
- Full Text:
- Date Issued: 1976
Brian Bradshaw
- Authors: Hogge, Rosemary
- Date: 1976
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2506 , http://hdl.handle.net/10962/d1016168
- Description: One assumes that Brian Bradshaw's career in art had been decided upon at an early age, but in fact it was not so. After he had attended the Canon Slade Grammar School in Bolton, his father suggested various options, some of them interesting, like becoming a veterinary surgeon, but that was rejected because although the boy liked 'putting things right' he didn't savour 'cutting things up'. For the same reason he couldn't follow the family tradition on his mother's side and become a doctor. Nor was his wish to become a sea-captain treated with any seriousness, although he thinks with nostalgia of life at sea; and he is pleased he didn't take up forestry because, although he loves the land and admires the art of designing the great gardens and parks which surrounded the Georgian and Regency houses of the 18th Century, he is appalled by the artificial mess they're making of the land now. So in that interim period before being conscripted, they suggested at home that he spend a few months at the Bolton Municipal School of Art under the guidance of Mr. John R. Gauld, and so his course was set for the future. He studied there for three years and was successful in obtaining the "drawing" and "pictorial design" certificates of the Ministry of Education, before joining His Majesty's Forces in 1942.
- Full Text:
- Date Issued: 1976
- Authors: Hogge, Rosemary
- Date: 1976
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2506 , http://hdl.handle.net/10962/d1016168
- Description: One assumes that Brian Bradshaw's career in art had been decided upon at an early age, but in fact it was not so. After he had attended the Canon Slade Grammar School in Bolton, his father suggested various options, some of them interesting, like becoming a veterinary surgeon, but that was rejected because although the boy liked 'putting things right' he didn't savour 'cutting things up'. For the same reason he couldn't follow the family tradition on his mother's side and become a doctor. Nor was his wish to become a sea-captain treated with any seriousness, although he thinks with nostalgia of life at sea; and he is pleased he didn't take up forestry because, although he loves the land and admires the art of designing the great gardens and parks which surrounded the Georgian and Regency houses of the 18th Century, he is appalled by the artificial mess they're making of the land now. So in that interim period before being conscripted, they suggested at home that he spend a few months at the Bolton Municipal School of Art under the guidance of Mr. John R. Gauld, and so his course was set for the future. He studied there for three years and was successful in obtaining the "drawing" and "pictorial design" certificates of the Ministry of Education, before joining His Majesty's Forces in 1942.
- Full Text:
- Date Issued: 1976
Changes in the aerobic saprophytic microbial flora during biltong production with special reference to the micrococcaceae
- Authors: Taylor, M B
- Date: 1976
- Subjects: Micrococcaceae , Saprophytism
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4120 , http://hdl.handle.net/10962/d1013308
- Description: Ninety-four presumptive Micrococcus and Staphylococcus strains isolated from both commercial beef biltong and game biltong, were identified using a scheme based on the system used by Baird-Parker. The changes occurring in both the aerobic, saprophytic microbial flora and the environmental factors, during conversion of beef to biltong, were examined. The predominantly Gram-negative, halo-sensitive flora initially present on the meat, was replaced by Gram-positive, halo-tolerant staphylococci and micrococci, which form the dominant component of the microflora of the final product. This replacement was attributed to changing environmental factors, principally to the increasing sodium chloride concentration and associated decline in water activity. The presence of the antifungal antibiotic, pimaricin, during processing did not influence the bacterial flora of the product. However, the addition of potassium sorbate altered the microbial profile of the product significantly. The presence of these two preservatives, at the concentrations used, could not be detected organoleptically. The importance of the saprophytic microflora of the product ln relation to the environmental factors during processing, is also discussed.
- Full Text:
- Date Issued: 1976
- Authors: Taylor, M B
- Date: 1976
- Subjects: Micrococcaceae , Saprophytism
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4120 , http://hdl.handle.net/10962/d1013308
- Description: Ninety-four presumptive Micrococcus and Staphylococcus strains isolated from both commercial beef biltong and game biltong, were identified using a scheme based on the system used by Baird-Parker. The changes occurring in both the aerobic, saprophytic microbial flora and the environmental factors, during conversion of beef to biltong, were examined. The predominantly Gram-negative, halo-sensitive flora initially present on the meat, was replaced by Gram-positive, halo-tolerant staphylococci and micrococci, which form the dominant component of the microflora of the final product. This replacement was attributed to changing environmental factors, principally to the increasing sodium chloride concentration and associated decline in water activity. The presence of the antifungal antibiotic, pimaricin, during processing did not influence the bacterial flora of the product. However, the addition of potassium sorbate altered the microbial profile of the product significantly. The presence of these two preservatives, at the concentrations used, could not be detected organoleptically. The importance of the saprophytic microflora of the product ln relation to the environmental factors during processing, is also discussed.
- Full Text:
- Date Issued: 1976
Die administratiewe funksionering van bewindsinstellings in die Ciskei met besondere verwysing na plaaslike bestuur
- Authors: Groenewald, David Marais
- Date: 1976
- Subjects: Public institutions -- Administration -- South Africa -- Ciskei , Public institutions -- Management -- South Africa -- Ciskei , Public institutions -- Government -- South Africa -- Ciskei
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:2877 , http://hdl.handle.net/10962/d1012099 , Public institutions -- Administration -- South Africa -- Ciskei , Public institutions -- Management -- South Africa -- Ciskei , Public institutions -- Government -- South Africa -- Ciskei
- Description: As gevolg van die ongekonsolideerde aard van die Bantoegebiede in die Ciskei is dit onmoontlik om diè gebied te begrens binne bepaalde relief kenmerke, soos bv. berge en riviere; of selfs binne administratiewe grense soos bv. magistraatsdistrikte. Intro., p. 1
- Full Text:
- Date Issued: 1976
- Authors: Groenewald, David Marais
- Date: 1976
- Subjects: Public institutions -- Administration -- South Africa -- Ciskei , Public institutions -- Management -- South Africa -- Ciskei , Public institutions -- Government -- South Africa -- Ciskei
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:2877 , http://hdl.handle.net/10962/d1012099 , Public institutions -- Administration -- South Africa -- Ciskei , Public institutions -- Management -- South Africa -- Ciskei , Public institutions -- Government -- South Africa -- Ciskei
- Description: As gevolg van die ongekonsolideerde aard van die Bantoegebiede in die Ciskei is dit onmoontlik om diè gebied te begrens binne bepaalde relief kenmerke, soos bv. berge en riviere; of selfs binne administratiewe grense soos bv. magistraatsdistrikte. Intro., p. 1
- Full Text:
- Date Issued: 1976
Distribution of Ca in highly fractionated peralkaline magmas
- Authors: Marsh, Julian S
- Date: 1976
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/132974 , vital:36914 , https://doi.org/10.1016/0012-821X(76)90106-0
- Description: Many peralkaline rhyolites and granites contain less than 0.15 wt.% CaO. In contrast, strongly fractionated peralkaline nepheline syenites and phonolites usually contain greater than 0.5 wt.% CaO. Consideration of known distributions of Ca between crystals and liquid in conjunction with crystal fractionation does not provide an adequate explanation of the contrasting levels of Ca depletion observed. Examination of the suites of late-crystallizing accessory phases in peralkaline rocks suggests that Ca is more soluble in undersaturated magmas than in over-saturated magmas. Activities for CaO in silicic and phonolitic rocks are calculated and the latter have higher CaO activities than the former and this may manifest itself in the different suites of accessory phases and levels of Ca depletion noted in natural rocks.
- Full Text: false
- Date Issued: 1976
- Authors: Marsh, Julian S
- Date: 1976
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/132974 , vital:36914 , https://doi.org/10.1016/0012-821X(76)90106-0
- Description: Many peralkaline rhyolites and granites contain less than 0.15 wt.% CaO. In contrast, strongly fractionated peralkaline nepheline syenites and phonolites usually contain greater than 0.5 wt.% CaO. Consideration of known distributions of Ca between crystals and liquid in conjunction with crystal fractionation does not provide an adequate explanation of the contrasting levels of Ca depletion observed. Examination of the suites of late-crystallizing accessory phases in peralkaline rocks suggests that Ca is more soluble in undersaturated magmas than in over-saturated magmas. Activities for CaO in silicic and phonolitic rocks are calculated and the latter have higher CaO activities than the former and this may manifest itself in the different suites of accessory phases and levels of Ca depletion noted in natural rocks.
- Full Text: false
- Date Issued: 1976
Drummer Hodge : the poetry of the Anglo-Boer War (1899-1902)
- Authors: Van Wyk Smith, Malvern
- Date: 1976
- Subjects: War poetry -- History and criticism South African War, 1899-1902 -- Literature and the war South African War, 1899-1902 -- Art and the war
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2252 , http://hdl.handle.net/10962/d1003919
- Description: From Preface: This is not a history of the Boer War; nor is it an exclusively literary study of the poetry of that war. If the work that follows has to be defined generically at all, it may be called an exercise in cultural history. It attempts to assess the impact of a particular war on the literary culture, especially the poetry, of both the participants and the observers, whether in South Africa, in Britain and the rest of the English-speaking world, or in Europe. An assumption made throughout this study is that war poetry is not only verse written by men who are or have been under fire. Just as 'War poetry is not to be confused with political, polemical, or patriotic verse, although it can contain elements of all of these, so it is also the work of observers at home as much as that of soldiers at the front. It follows that I have not allowed myself the academic luxury of selecting, on the basis of literary merit only, a handful of outstanding war poems for rigorous analysis and discussion. "Doggerel can express the heart" wrote one of these late-Victorian soldierly versifiers, and I have roamed widely in the attempt to assemble the material which, I believe, records the full range of the impact that the Boer War made not only on Briton and Boer, but on the worId at large. A major thesis of this study is that the Boer War marked the clear emergence of the kind of war poetry which we have come to associate almost exclusively with the First World War. Poems in the style and spirit of "The Charge of the Light Brigade" were written in profusion, but the work which serves as this study's masthead, Hardy's "Drummer Hodge," clearly has --like many of its contemporaries-- more in common with Owen's verse than with Tennyson's. The reasons for the appearance of such poetry are discussed in Chapter 1; the rest of the book provides the evidence of it.
- Full Text:
- Date Issued: 1976
- Authors: Van Wyk Smith, Malvern
- Date: 1976
- Subjects: War poetry -- History and criticism South African War, 1899-1902 -- Literature and the war South African War, 1899-1902 -- Art and the war
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2252 , http://hdl.handle.net/10962/d1003919
- Description: From Preface: This is not a history of the Boer War; nor is it an exclusively literary study of the poetry of that war. If the work that follows has to be defined generically at all, it may be called an exercise in cultural history. It attempts to assess the impact of a particular war on the literary culture, especially the poetry, of both the participants and the observers, whether in South Africa, in Britain and the rest of the English-speaking world, or in Europe. An assumption made throughout this study is that war poetry is not only verse written by men who are or have been under fire. Just as 'War poetry is not to be confused with political, polemical, or patriotic verse, although it can contain elements of all of these, so it is also the work of observers at home as much as that of soldiers at the front. It follows that I have not allowed myself the academic luxury of selecting, on the basis of literary merit only, a handful of outstanding war poems for rigorous analysis and discussion. "Doggerel can express the heart" wrote one of these late-Victorian soldierly versifiers, and I have roamed widely in the attempt to assemble the material which, I believe, records the full range of the impact that the Boer War made not only on Briton and Boer, but on the worId at large. A major thesis of this study is that the Boer War marked the clear emergence of the kind of war poetry which we have come to associate almost exclusively with the First World War. Poems in the style and spirit of "The Charge of the Light Brigade" were written in profusion, but the work which serves as this study's masthead, Hardy's "Drummer Hodge," clearly has --like many of its contemporaries-- more in common with Owen's verse than with Tennyson's. The reasons for the appearance of such poetry are discussed in Chapter 1; the rest of the book provides the evidence of it.
- Full Text:
- Date Issued: 1976
Evening cooking fires: eLuhewini, 1976
- Ingle, Pauline Cornwell, 1915-1999
- Authors: Ingle, Pauline Cornwell, 1915-1999
- Date: 1976
- Subjects: Xhosa (African people) -- Social life and customs , Photography -- South Africa
- Language: English
- Type: Still image
- Identifier: vital:12015 , http://hdl.handle.net/10353/d1000792 , Xhosa (African people) -- Social life and customs , Photography -- South Africa
- Full Text: false
- Date Issued: 1976
- Authors: Ingle, Pauline Cornwell, 1915-1999
- Date: 1976
- Subjects: Xhosa (African people) -- Social life and customs , Photography -- South Africa
- Language: English
- Type: Still image
- Identifier: vital:12015 , http://hdl.handle.net/10353/d1000792 , Xhosa (African people) -- Social life and customs , Photography -- South Africa
- Full Text: false
- Date Issued: 1976
Farm labour in the Eastern Cape, 1950-1973:
- Authors: Antrobus, Geoffrey G
- Date: 1976
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142850 , vital:38123 , http://opensaldru.uct.ac.za/bitstream/handle/11090/465/1976_antrobus_sflcp20.pdf?sequence=1
- Description: The purpose of this paper is to, survey the farm labour conditions in the Eastern Cape over approximately two decades and to note some of the conditions of service and the attitudes of employers, and the changes which have occurred in employment and wages paid. The main source for the latter period, and in particular 1973, is a farm labour survey conducted in conjunction with E.A. Thomson in the Eastern Cape. The survey relied entirely on the willingness of members of farm study groups and Farmers' Associations as well as interested individuals for its completion. Of the approximately 1020 pre-coded questionnaires which were posted to farmers throughout the Eastern Cape in June 1973, 303 were returned of which 299 were suitable for analysis.
- Full Text:
- Date Issued: 1976
- Authors: Antrobus, Geoffrey G
- Date: 1976
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/142850 , vital:38123 , http://opensaldru.uct.ac.za/bitstream/handle/11090/465/1976_antrobus_sflcp20.pdf?sequence=1
- Description: The purpose of this paper is to, survey the farm labour conditions in the Eastern Cape over approximately two decades and to note some of the conditions of service and the attitudes of employers, and the changes which have occurred in employment and wages paid. The main source for the latter period, and in particular 1973, is a farm labour survey conducted in conjunction with E.A. Thomson in the Eastern Cape. The survey relied entirely on the willingness of members of farm study groups and Farmers' Associations as well as interested individuals for its completion. Of the approximately 1020 pre-coded questionnaires which were posted to farmers throughout the Eastern Cape in June 1973, 303 were returned of which 299 were suitable for analysis.
- Full Text:
- Date Issued: 1976
From frontier to midlands: a history of the Graaff-Reinet district, 1786-1910
- Authors: Smith, Kenneth Wyndham
- Date: 1976
- Subjects: Graaff-Reinet (South Africa) -- History
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2656 , vital:20313 , ISBN 0949980730
- Description: The study of local history in South Africa is still in its infancy and has not been accorded the same recognition as elsewhere. There is no convenient manual to guide the would-be local historian of the Cape. There are few models that provide an insight into the main problems encountered by the local historian of a Cape community. In such local histories as exist, attention has been focussed predominantly on the foundation and physical growth of towns, the naming of streets, the establishment of schools and hospitals. Many of these accounts were written for publicity purposes or to commemorate the founding of towns. Although there is no history of the Dutch Reformed Church in Graaff-Reinet, the history of local congregations of the Dutch Reformed Church has generally been well covered in the form of Gedenkboeke and other studies. These frequently have a particular relevance as many towns such as Burgersdorp and Colesberg were founded as a result of the initiative of the church. Preface. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1976
- Authors: Smith, Kenneth Wyndham
- Date: 1976
- Subjects: Graaff-Reinet (South Africa) -- History
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2656 , vital:20313 , ISBN 0949980730
- Description: The study of local history in South Africa is still in its infancy and has not been accorded the same recognition as elsewhere. There is no convenient manual to guide the would-be local historian of the Cape. There are few models that provide an insight into the main problems encountered by the local historian of a Cape community. In such local histories as exist, attention has been focussed predominantly on the foundation and physical growth of towns, the naming of streets, the establishment of schools and hospitals. Many of these accounts were written for publicity purposes or to commemorate the founding of towns. Although there is no history of the Dutch Reformed Church in Graaff-Reinet, the history of local congregations of the Dutch Reformed Church has generally been well covered in the form of Gedenkboeke and other studies. These frequently have a particular relevance as many towns such as Burgersdorp and Colesberg were founded as a result of the initiative of the church. Preface. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1976
Geology of the Elisenheim area, Windhoek district, South West Africa, with special reference to the Matchless amphibolite belt
- Authors: Finnemore, S H
- Date: 1976
- Subjects: Matchless Copper Mine (Namibia) , Geology, Structural -- Namibia , Amphibolite -- Namibia , Geology -- Namibia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5053 , http://hdl.handle.net/10962/d1011864
- Description: The Elisenheim area is situated just north of Windhoek within the Windhoek Formation of the Swakop Subgroup and is underlain by monotonous succession of semi-pelitic schists with intercalations of amphibolite, talc schist, graphitic schist and marble. Petrographic studies on units of the Matchless amphibolite which outcrop in the south of the property, have resulted in the recognition of three different types of amphibolite, namely, epidote amphibolite, porphyroblastic amphibolite and chlorite-amphibole schist. Amphibole porphyroblasts generally display patchy and zonal intergrowths of hornblende and actinolite which are indicative of non-equilibration during prograde metamorphism. Talc schists have been mapped in the north of the property. All lithotypes have undergone three phases of deformation (Fl, FZ, F3) which terminated with the faulting which underlies the Klein Windhoek, Dobra, Tigenschlücht and Kuruma rivers. Medium grade regional metamorphism accompanied F 1, F Z and F 3 and outlasted the latter. Mineral assemblages throughout the area are those of the amphibolite facies and P, T conditions prevailing during metamorphism are estimated to have been at least 5 kb at ~ 550° C. Petrochemical evidence indicates that the Matchless amphibolites are igneous in origin and genetically related to the ultrabasic talc schists. They are similar in composition to oceanic tholeiites and are thought to have been extruded subaqueously.
- Full Text:
- Date Issued: 1976
- Authors: Finnemore, S H
- Date: 1976
- Subjects: Matchless Copper Mine (Namibia) , Geology, Structural -- Namibia , Amphibolite -- Namibia , Geology -- Namibia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5053 , http://hdl.handle.net/10962/d1011864
- Description: The Elisenheim area is situated just north of Windhoek within the Windhoek Formation of the Swakop Subgroup and is underlain by monotonous succession of semi-pelitic schists with intercalations of amphibolite, talc schist, graphitic schist and marble. Petrographic studies on units of the Matchless amphibolite which outcrop in the south of the property, have resulted in the recognition of three different types of amphibolite, namely, epidote amphibolite, porphyroblastic amphibolite and chlorite-amphibole schist. Amphibole porphyroblasts generally display patchy and zonal intergrowths of hornblende and actinolite which are indicative of non-equilibration during prograde metamorphism. Talc schists have been mapped in the north of the property. All lithotypes have undergone three phases of deformation (Fl, FZ, F3) which terminated with the faulting which underlies the Klein Windhoek, Dobra, Tigenschlücht and Kuruma rivers. Medium grade regional metamorphism accompanied F 1, F Z and F 3 and outlasted the latter. Mineral assemblages throughout the area are those of the amphibolite facies and P, T conditions prevailing during metamorphism are estimated to have been at least 5 kb at ~ 550° C. Petrochemical evidence indicates that the Matchless amphibolites are igneous in origin and genetically related to the ultrabasic talc schists. They are similar in composition to oceanic tholeiites and are thought to have been extruded subaqueously.
- Full Text:
- Date Issued: 1976
Grazing sequence pattern and species selection by cattle in the Dohne sourveld
- Authors: Daines, Thomas
- Date: 1976
- Subjects: Grasses -- Research -- South Africa -- Cape of Good Hope , Grasses -- South Africa -- Cape of Good Hope -- Identification , Grazing -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4257 , http://hdl.handle.net/10962/d1010955
- Description: A detailed investigation into the harvesting of the standing grass crop within camps by cattle showed the following: 1. Cattle have a definite order of preference for the components of the Dohne Sourveld grass sward. The most palatable species in order of preference (based on Corrected Species Importance rating) are Themeda triandra, Tristachya hispida, Andropogon appendiculatus, Alloteropsis semialata and Heteropogon contortus. The least preferred species is Elionurus argenteus. 2. The key species, which is defined as the most abundant and productive palatable species, has been identified as Themeda triandra. 3. In harvesting the grass crop, cattle not only have a set preference for species, but also have a set grazing sequence pattern. This can be divided into three main phases. On entering the camp the animals first select the species of their choice, "creaming" these plants (grazed less than 50%) to obtain the most nutritious feed. In their daily search for food they spread their grazing over an increasingly wider area and over a wider range of species. When they can no longer obtain their daily requirements from this "creaming" operation of the more preferred species they return to the most preferred species , which are then heavily grazed (more than 50%) producing the common pattern of area grazing within a camp. These areas increase in size as the cattle graze down the species of their choice, moving to less preferred species as soon as they can no longer obtain their daily intake requirements from the more preferred species. Finally when they have no alternative they graze the least preferred species. 4. Increasing the stocking density does not alter the grazing sequence pattern or change the order of preference for the component species in the sward. It only increases the rate of utilization of the more preferred species and the various phases in the grazing sequence pattern are reached more rapidly. 5. At higher stocking densities the palatable species are more evenly utilized than at lower stocking densities. 6. Cattle graze a greater variety of species when the sward is young and actively growing. As the maturity of the sward increases the cattle concentrate on the more preferred species and are more selective in their grazing. However, their order of preference remains the same. Species that are highly preferred early in the season retain their ranking when the sward is mature. The only exception to this rule is Alloteropsis semialata. Early in the growing season this species is high on the preference list, but as it matures less is taken until when fully mature, it is rejected by cattle. 7. Elionurus argenteus is the least preferred of all the species in the Dohne Sourveld. Cattle will graze this plant as a last resort when grazing a camp early in the season, but reject the plant when it is fully mature. 8. To retain vigour and production of the Dohne Sourveld results of this investigation support the view that grazing management should be based on the principle of controlled selective grazing. Having shown that the more preferred species are over-utilized when attempting to utilize the least preferred species any grazing management that calls for total utilization of all standing vegetation should be rejected. 9. The results of this investigation supports a multicamp system for the Dohne Sourveld where high stocking densities are employed. This will result in the rapid and even utilization of the more preferred species. Management should be based on short period of stay and long period of absence. Cattle should be moved as soon as the key species have been well utilized, but not overgrazed. Cattle should only be returned to the camp when key species have made adequate regrowth following grazing. 10. A method, that is simple to use, is proposed for determining utilization of the veld and key species at different times of the year using the relationship between percentage of ungrazed plants and utilization of the sward and of Themeda triandra, the key grazing species in the sward. 11. Results show that when rested camps are grazed after May, the number of Themeda triandra inflorescences are drastically reduced. Veld that is specifically rested for the production of Themeda triandra seed should be rested from March of the year preceding expected seeding.
- Full Text:
- Date Issued: 1976
- Authors: Daines, Thomas
- Date: 1976
- Subjects: Grasses -- Research -- South Africa -- Cape of Good Hope , Grasses -- South Africa -- Cape of Good Hope -- Identification , Grazing -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4257 , http://hdl.handle.net/10962/d1010955
- Description: A detailed investigation into the harvesting of the standing grass crop within camps by cattle showed the following: 1. Cattle have a definite order of preference for the components of the Dohne Sourveld grass sward. The most palatable species in order of preference (based on Corrected Species Importance rating) are Themeda triandra, Tristachya hispida, Andropogon appendiculatus, Alloteropsis semialata and Heteropogon contortus. The least preferred species is Elionurus argenteus. 2. The key species, which is defined as the most abundant and productive palatable species, has been identified as Themeda triandra. 3. In harvesting the grass crop, cattle not only have a set preference for species, but also have a set grazing sequence pattern. This can be divided into three main phases. On entering the camp the animals first select the species of their choice, "creaming" these plants (grazed less than 50%) to obtain the most nutritious feed. In their daily search for food they spread their grazing over an increasingly wider area and over a wider range of species. When they can no longer obtain their daily requirements from this "creaming" operation of the more preferred species they return to the most preferred species , which are then heavily grazed (more than 50%) producing the common pattern of area grazing within a camp. These areas increase in size as the cattle graze down the species of their choice, moving to less preferred species as soon as they can no longer obtain their daily intake requirements from the more preferred species. Finally when they have no alternative they graze the least preferred species. 4. Increasing the stocking density does not alter the grazing sequence pattern or change the order of preference for the component species in the sward. It only increases the rate of utilization of the more preferred species and the various phases in the grazing sequence pattern are reached more rapidly. 5. At higher stocking densities the palatable species are more evenly utilized than at lower stocking densities. 6. Cattle graze a greater variety of species when the sward is young and actively growing. As the maturity of the sward increases the cattle concentrate on the more preferred species and are more selective in their grazing. However, their order of preference remains the same. Species that are highly preferred early in the season retain their ranking when the sward is mature. The only exception to this rule is Alloteropsis semialata. Early in the growing season this species is high on the preference list, but as it matures less is taken until when fully mature, it is rejected by cattle. 7. Elionurus argenteus is the least preferred of all the species in the Dohne Sourveld. Cattle will graze this plant as a last resort when grazing a camp early in the season, but reject the plant when it is fully mature. 8. To retain vigour and production of the Dohne Sourveld results of this investigation support the view that grazing management should be based on the principle of controlled selective grazing. Having shown that the more preferred species are over-utilized when attempting to utilize the least preferred species any grazing management that calls for total utilization of all standing vegetation should be rejected. 9. The results of this investigation supports a multicamp system for the Dohne Sourveld where high stocking densities are employed. This will result in the rapid and even utilization of the more preferred species. Management should be based on short period of stay and long period of absence. Cattle should be moved as soon as the key species have been well utilized, but not overgrazed. Cattle should only be returned to the camp when key species have made adequate regrowth following grazing. 10. A method, that is simple to use, is proposed for determining utilization of the veld and key species at different times of the year using the relationship between percentage of ungrazed plants and utilization of the sward and of Themeda triandra, the key grazing species in the sward. 11. Results show that when rested camps are grazed after May, the number of Themeda triandra inflorescences are drastically reduced. Veld that is specifically rested for the production of Themeda triandra seed should be rested from March of the year preceding expected seeding.
- Full Text:
- Date Issued: 1976
Guy Butler at the dinner when awarded the CNA Prize for Literature (Selected poems) with Slater and Alan Macintosh
- Date: 1976
- Subjects: Butler, Guy, 1918-2001 -- Photographs Butler family -- Photographs
- Type: still image
- Identifier: http://hdl.handle.net/10962/41879 , vital:25143 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 4943/10.27
- Full Text: false
- Date Issued: 1976
- Date: 1976
- Subjects: Butler, Guy, 1918-2001 -- Photographs Butler family -- Photographs
- Type: still image
- Identifier: http://hdl.handle.net/10962/41879 , vital:25143 , This image is held at the Cory Library for Humanities Research at Rhodes University. For further information contact cory@ru.ac.za. The digitisation of this image was made possible through a generous grant received from the Andrew W. Mellon Foundation 2014-2017. , PIC/M 4943/10.27
- Full Text: false
- Date Issued: 1976
Pre-release studies on Zophodia Tapiacola (Dyar) (Pyralidae : Lepidoptera) : a biological control agent against jointed cactus, Optuntia Aurantiaca Lindley
- Authors: Hoffmann, John Hugh
- Date: 1976
- Subjects: Pyralidae , Lepidoptera , Cactus , Weeds -- Biological control , Opuntia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5857 , http://hdl.handle.net/10962/d1012320 , Pyralidae , Lepidoptera , Cactus , Weeds -- Biological control , Opuntia
- Description: Jointed Cactus, Opuntia aurantiaca Lindley (see frontispiece), is the most important weed plant in South Africa, infesting approximately, 1,2 X 10¹° M² and costing approximately R240 000 per annum. Tordon herbicide effectively kills jointed cactus bushes to which it is applied. However, apart from being expensive and damaging to beneficial vegetation, spray programmes have not successfully controlled the weed because most small O. aurantiaca plants are impossible to detect in the field. Biological control may provide a solution to the problem. Two insects, the cochineal bug, Dactylopius austrinus De Lotto and the pyralid moth, Cactoblastis cactorum Berg., already exercise a degree of control over the weed. The introduction into South Africa of other natural enemies such as Zophodia tapiacola (Dyar) from Argentina, South America, may reduce the density of jointed cactus to below an acceptable economic threshold. Any insect considered for release should not colonise and destroy beneficial plants of which the culivated spineless cacti are the most vulnerable. Pre-release studies on Z. tapiacola have shown that it can only colonise a few species of low growing cacti and that it will not damage the large spineless cacti or other desirable plants. Further, the moths are relatively fecund and each larva destroys significant amounts of O. aurantiaca during its development. Consequently, Z. tapiacola is not only considered safe for release but it has the potential to act as a successful biological control agent of O. aurantiaca in South Africa.
- Full Text:
- Date Issued: 1976
- Authors: Hoffmann, John Hugh
- Date: 1976
- Subjects: Pyralidae , Lepidoptera , Cactus , Weeds -- Biological control , Opuntia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5857 , http://hdl.handle.net/10962/d1012320 , Pyralidae , Lepidoptera , Cactus , Weeds -- Biological control , Opuntia
- Description: Jointed Cactus, Opuntia aurantiaca Lindley (see frontispiece), is the most important weed plant in South Africa, infesting approximately, 1,2 X 10¹° M² and costing approximately R240 000 per annum. Tordon herbicide effectively kills jointed cactus bushes to which it is applied. However, apart from being expensive and damaging to beneficial vegetation, spray programmes have not successfully controlled the weed because most small O. aurantiaca plants are impossible to detect in the field. Biological control may provide a solution to the problem. Two insects, the cochineal bug, Dactylopius austrinus De Lotto and the pyralid moth, Cactoblastis cactorum Berg., already exercise a degree of control over the weed. The introduction into South Africa of other natural enemies such as Zophodia tapiacola (Dyar) from Argentina, South America, may reduce the density of jointed cactus to below an acceptable economic threshold. Any insect considered for release should not colonise and destroy beneficial plants of which the culivated spineless cacti are the most vulnerable. Pre-release studies on Z. tapiacola have shown that it can only colonise a few species of low growing cacti and that it will not damage the large spineless cacti or other desirable plants. Further, the moths are relatively fecund and each larva destroys significant amounts of O. aurantiaca during its development. Consequently, Z. tapiacola is not only considered safe for release but it has the potential to act as a successful biological control agent of O. aurantiaca in South Africa.
- Full Text:
- Date Issued: 1976
Psychology in the second person : inaugural lecture delivered at Rhodes University
- Authors: Kruger, Dreyer
- Date: 1976
- Subjects: Psychology -- United States -- Philosophy
- Language: English
- Type: Text
- Identifier: vital:645 , http://hdl.handle.net/10962/d1020714 , ISBN 0949980706
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1976
- Authors: Kruger, Dreyer
- Date: 1976
- Subjects: Psychology -- United States -- Philosophy
- Language: English
- Type: Text
- Identifier: vital:645 , http://hdl.handle.net/10962/d1020714 , ISBN 0949980706
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1976
Reaction phenomena between Karroo Dolerite and cave sandstone xenoliths in the Bird's River complex
- Authors: Kenyon, A K
- Date: 1976
- Subjects: Volcanic ash, tuff, etc , Igneous rocks -- Inclusions , Sandstone
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4996 , http://hdl.handle.net/10962/d1005608
- Description: Mapping of the north-eastern portion of the Bird1s River Complex revealed that two large xenoliths composed of pyroclastic rocks and sandstone of the Cave Sandstone Stage have reacted with the dolerite. All the reaction phenomena normally associated with Karroo Dolerite are encountered. These are: (a) Metasomatism during the stage of iron enrichment of the dolerite with the production of a pyroxene-plagioclase metasomatic granophyre (b) Metasomatism during the stage of alkali enrichment of the dolerite with the production of a potassium feldspar adinole C c) Assimilation 'vi th the production of contaminated doleri tes Cd) Fusion 'vi th the production of glassy rocks including buchi tes (e) The production of rheomorphic veins
- Full Text:
- Date Issued: 1976
- Authors: Kenyon, A K
- Date: 1976
- Subjects: Volcanic ash, tuff, etc , Igneous rocks -- Inclusions , Sandstone
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4996 , http://hdl.handle.net/10962/d1005608
- Description: Mapping of the north-eastern portion of the Bird1s River Complex revealed that two large xenoliths composed of pyroclastic rocks and sandstone of the Cave Sandstone Stage have reacted with the dolerite. All the reaction phenomena normally associated with Karroo Dolerite are encountered. These are: (a) Metasomatism during the stage of iron enrichment of the dolerite with the production of a pyroxene-plagioclase metasomatic granophyre (b) Metasomatism during the stage of alkali enrichment of the dolerite with the production of a potassium feldspar adinole C c) Assimilation 'vi th the production of contaminated doleri tes Cd) Fusion 'vi th the production of glassy rocks including buchi tes (e) The production of rheomorphic veins
- Full Text:
- Date Issued: 1976
Reading the signs : inaugural address delivered at Rhodes University
- Authors: Seagrief, S C
- Date: 1976
- Subjects: Botany -- South Africa , Marine algae -- South Africa
- Language: English
- Type: Text
- Identifier: vital:667 , http://hdl.handle.net/10962/d1020736 , ISBN 0949980749
- Description: Inaugural address delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1976
- Authors: Seagrief, S C
- Date: 1976
- Subjects: Botany -- South Africa , Marine algae -- South Africa
- Language: English
- Type: Text
- Identifier: vital:667 , http://hdl.handle.net/10962/d1020736 , ISBN 0949980749
- Description: Inaugural address delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1976
Rhodeo, Vol. 30, No. 2
- Date: 1976
- Subjects: Grahamstown -- Newspapers , Journalism, Students -- South Africa , Rhodes University -- Activate , Rhodes University -- Students , Student newspapers and periodicals -- South Africa
- Language: English
- Type: Text
- Identifier: vital:14670 , http://hdl.handle.net/10962/d1019542
- Description: Rhodeo is the Independent Student Newspaper of Rhodes University. Located in Grahamstown, Rhodeo was established in 1947, and renamed in 1994 as Activate. During apartheid Rhodeo became an active part of the struggle for freedom of expression as part of the now defunct South African Student Press Union. Currently Activate is committed to informing Rhodes University students, staff and community members about relevant issues, mainly on campus. These issues range from hard news to more creative journalism. While Activate acts as a news source, one of its main objectives it to be accessible as a training ground for student journalists. The newspaper is run entirely by the students and is published twice a term. Activate is a free newspaper which receives an annual grant from the Rhodes University Student Representative Council, however, majority of its revenue is generated through advertising.
- Full Text:
- Date Issued: 1976
- Date: 1976
- Subjects: Grahamstown -- Newspapers , Journalism, Students -- South Africa , Rhodes University -- Activate , Rhodes University -- Students , Student newspapers and periodicals -- South Africa
- Language: English
- Type: Text
- Identifier: vital:14670 , http://hdl.handle.net/10962/d1019542
- Description: Rhodeo is the Independent Student Newspaper of Rhodes University. Located in Grahamstown, Rhodeo was established in 1947, and renamed in 1994 as Activate. During apartheid Rhodeo became an active part of the struggle for freedom of expression as part of the now defunct South African Student Press Union. Currently Activate is committed to informing Rhodes University students, staff and community members about relevant issues, mainly on campus. These issues range from hard news to more creative journalism. While Activate acts as a news source, one of its main objectives it to be accessible as a training ground for student journalists. The newspaper is run entirely by the students and is published twice a term. Activate is a free newspaper which receives an annual grant from the Rhodes University Student Representative Council, however, majority of its revenue is generated through advertising.
- Full Text:
- Date Issued: 1976
Rhodeo: 1976 - SRC Election Supplement.pdf
- Date: 1976
- Subjects: Grahamstown -- Newspapers , Journalism, Students -- South Africa , Rhodes University -- Activate , Rhodes University -- Students , Student newspapers and periodicals -- South Africa
- Language: English
- Type: Text
- Identifier: vital:14668 , http://hdl.handle.net/10962/d1019540
- Description: Rhodeo is the Independent Student Newspaper of Rhodes University. Located in Grahamstown, Rhodeo was established in 1947, and renamed in 1994 as Activate. During apartheid Rhodeo became an active part of the struggle for freedom of expression as part of the now defunct South African Student Press Union. Currently Activate is committed to informing Rhodes University students, staff and community members about relevant issues, mainly on campus. These issues range from hard news to more creative journalism. While Activate acts as a news source, one of its main objectives it to be accessible as a training ground for student journalists. The newspaper is run entirely by the students and is published twice a term. Activate is a free newspaper which receives an annual grant from the Rhodes University Student Representative Council, however, majority of its revenue is generated through advertising.
- Full Text:
- Date Issued: 1976
- Date: 1976
- Subjects: Grahamstown -- Newspapers , Journalism, Students -- South Africa , Rhodes University -- Activate , Rhodes University -- Students , Student newspapers and periodicals -- South Africa
- Language: English
- Type: Text
- Identifier: vital:14668 , http://hdl.handle.net/10962/d1019540
- Description: Rhodeo is the Independent Student Newspaper of Rhodes University. Located in Grahamstown, Rhodeo was established in 1947, and renamed in 1994 as Activate. During apartheid Rhodeo became an active part of the struggle for freedom of expression as part of the now defunct South African Student Press Union. Currently Activate is committed to informing Rhodes University students, staff and community members about relevant issues, mainly on campus. These issues range from hard news to more creative journalism. While Activate acts as a news source, one of its main objectives it to be accessible as a training ground for student journalists. The newspaper is run entirely by the students and is published twice a term. Activate is a free newspaper which receives an annual grant from the Rhodes University Student Representative Council, however, majority of its revenue is generated through advertising.
- Full Text:
- Date Issued: 1976
Rhodeo: 1976 - SRC Election Supplement.pdf
- Date: 1976
- Subjects: Grahamstown -- Newspapers , Journalism, Students -- South Africa , Rhodes University -- Activate , Rhodes University -- Students , Student newspapers and periodicals -- South Africa
- Language: English
- Identifier: vital:14667 , http://hdl.handle.net/10962/d1019539
- Description: Rhodeo is the Independent Student Newspaper of Rhodes University. Located in Grahamstown, Rhodeo was established in 1947, and renamed in 1994 as Activate. During apartheid Rhodeo became an active part of the struggle for freedom of expression as part of the now defunct South African Student Press Union. Currently Activate is committed to informing Rhodes University students, staff and community members about relevant issues, mainly on campus. These issues range from hard news to more creative journalism. While Activate acts as a news source, one of its main objectives it to be accessible as a training ground for student journalists. The newspaper is run entirely by the students and is published twice a term. Activate is a free newspaper which receives an annual grant from the Rhodes University Student Representative Council, however, majority of its revenue is generated through advertising.
- Full Text:
- Date Issued: 1976
- Date: 1976
- Subjects: Grahamstown -- Newspapers , Journalism, Students -- South Africa , Rhodes University -- Activate , Rhodes University -- Students , Student newspapers and periodicals -- South Africa
- Language: English
- Identifier: vital:14667 , http://hdl.handle.net/10962/d1019539
- Description: Rhodeo is the Independent Student Newspaper of Rhodes University. Located in Grahamstown, Rhodeo was established in 1947, and renamed in 1994 as Activate. During apartheid Rhodeo became an active part of the struggle for freedom of expression as part of the now defunct South African Student Press Union. Currently Activate is committed to informing Rhodes University students, staff and community members about relevant issues, mainly on campus. These issues range from hard news to more creative journalism. While Activate acts as a news source, one of its main objectives it to be accessible as a training ground for student journalists. The newspaper is run entirely by the students and is published twice a term. Activate is a free newspaper which receives an annual grant from the Rhodes University Student Representative Council, however, majority of its revenue is generated through advertising.
- Full Text:
- Date Issued: 1976
Rhodes University Graduation Ceremony 1976
- Authors: Rhodes University
- Date: 1976
- Language: English
- Type: text
- Identifier: vital:8110 , http://hdl.handle.net/10962/d1004565
- Description: Rhodes University Graduation Ceremonies on Friday 9th April 1976 at 8 p.m. [and] on Saturday 10th April 1976 at 10:30 a.m.in the University Great Hall.
- Full Text:
- Date Issued: 1976
- Authors: Rhodes University
- Date: 1976
- Language: English
- Type: text
- Identifier: vital:8110 , http://hdl.handle.net/10962/d1004565
- Description: Rhodes University Graduation Ceremonies on Friday 9th April 1976 at 8 p.m. [and] on Saturday 10th April 1976 at 10:30 a.m.in the University Great Hall.
- Full Text:
- Date Issued: 1976