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A preliminary study of adaptation and inhibition of reflex claw opening in the crab Potamon perlatus (Milne Edwards)

- Bush, Brian M H

Authors: Bush, Brian M H
Date: 1956
Subjects: Crabs , Decapoda
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:5906 , http://hdl.handle.net/10962/d1014683
Description: The only recorded experimental attempt to determine the functional, biological significance of peripheral inhibition in the Crustacea is that of Hoffmann (1914). From a series of experiments on Astacus fluviatilis L. involving transsection of the opener inhibitor and motor axons of the cheliped, he concluded that the opener inhibitor axon of the claw responded to prolonged or repeated sensory stimulation by transmitting inhibitory impulses to the opener muscle, the peripheral inhibition thus evoked causing adaptation of the reflex opening responses of the claw to the sensory stimulation. This suggests that there may be (1) a very high degree of peripheral control of (a) the reactions of the animal to external stimuli, and perhaps also to proprioceptive stimuli, and therefore (b) of the behaviour of the animal; and (2) a correspondingly high degree of independence of this behaviour from central nervous control. It is therefore of importance to discover whether, in fact, this conclusion is valid for Astacus and other Decapod Crustacea, and if so, then to what extent the adaptation is peripherally controlled. A preliminary attempt haa been made to repeat these experiments of Hoffmann, using Potamon perlatus (M.Edw.). Experiments in which mechanical sensory stimulation was used to evoke reflex claw opening indicated that this conclusion is not applicable to P.perlatus. The adaptation of the mechanical claw openining responses which occurred with repeated sensory stimulation was not affected by transsection of either the specific opener inhibitor axon or the common inhibitor axon of the claw. It was evidently mainly due to sensory adaptation when the sensory stimuli were heavy, and to centrally controlled adaptation when the sensory stimuli were light. The significance of these results is discussed. Other effects observed during the course of the work, of electrical "sensory" stimulation, and of cerebral ganglion elimination, are also described and discussed in relation to the present problem.
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Robert Godlonton as architect of frontier opinion, with special reference to the politics of separatism, 1850-57

- Le Cordeur, Basil Alexander

Authors: Le Cordeur, Basil Alexander
Date: 1956
Subjects: Godlonton, Robert, 1794-1884 , Cape of Good Hope (South Africa) -- History -- 1795-1872 , Cape of Good Hope (South Africa) -- Politics and government -- 1795-1872 , Press and politics -- South Africa -- Cape of Good Hope , Editors -- South Africa -- History
Language: English
Type: Thesis , Masters , MA
Identifier: vital:2619 , http://hdl.handle.net/10962/d1013497
Description: [Preface] The broad outlines of Cape frontier historiography have so far been sketched from a study of official despatches and, to a lesser extent, of contemporary newspapers. There are many lacunae to be filled and many questions to be answered; here, it is evident that private papers have an indispensable role to play. Yet, despite isolated attempts to collect or index such papers, (such as that of Miss Una Long, in her Index to Unofficial, Privately-Owned Manuscripts relating to the history of South Africa), much untapped material still remains in private possession both in South Africa and overseas. In this study of a leading Eastern Province personality, prominence has been given to this type of material, and much of what has been used, has clearly not previoualy been examined by historians.
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Scientific management as applied to a South African sweet factory

- Bernstein, Jack

Authors: Bernstein, Jack
Date: 1956
Subjects: Candy industry -- Management , Candy industry -- South Africa
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:1111 , http://hdl.handle.net/10962/d1013494
Description: From Chapter 1: Among the many problems that the sweet industry in this country has had to overcome was the prejudice which favoured imported confectionery as against the local product. Fortunately this prejudice is slowly disappearing, firstly because imported sweets are largely unobtainable, and, secondly because the quality of the South African manufactured article has improved tremendously. Both the quantity and value of sweets produced in this country have increased over the last decade...
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Some aspects of the micro-arthropod fauna in the soils of pineapple fields in the Bathurst division, Eastern Cape Province

- Graham, P

Authors: Graham, P
Date: 1956
Subjects: Pineapple , Soils -- South Africa -- Eastern Cape , Soil surveys -- South Africa -- Eastern Cape , Soil science , Arthropoda -- South Africa , Arthropod pests -- South Africa , Soil animals
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:5853 , http://hdl.handle.net/10962/d1012087 , Pineapple , Soils -- South Africa -- Eastern Cape , Soil surveys -- South Africa -- Eastern Cape , Soil science , Arthropoda -- South Africa , Arthropod pests -- South Africa , Soil animals
Description: Although a considerable amount of work has been done on the fauna of the soil of temperate forests and pastures, very little is known about that of tropical and sub-tropical soils. Most of the work on tropical soils concerns the fauna of tropical forests ... . The present investigation represents an attempt to discover the effect of an imported perennial tropical and sub-tropical plant, the Pineapple, on the soil fauna of a semi-arid region (rainfall 15-25 inches). Intro., p. 1-2
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The fungal flora associated with black spot of pineapples

- Edmonstone-Sammons, Chloris

Authors: Edmonstone-Sammons, Chloris
Date: 1956
Subjects: Fungi , Pineapple -- Diseases and pests , Citrus -- Diseases and pests , Citrus -- Soils
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:4258 , http://hdl.handle.net/10962/d1011738 , Fungi , Pineapple -- Diseases and pests , Citrus -- Diseases and pests , Citrus -- Soils
Description: The earliest reference to investigations of "black spot" in pineapples is made by Tryon (1898), who refers to the work of Dr A. A. Brown (1896) of the stock Branch, Victoria (Aus.), who sectioned diseased areas of pineapples and found fungal spores and hyphae in the tissues. The symptoms of this socalled "fruitlet core rot," are described by Tryon as: "well defined dark brown markings immediately beneath the surface, and passing inwards to a depth of 1/4" to 1/2"- the malady commencing in separate fruitlets, the central core of the fruit remaining quite healthy." (This description agrees with the symptoms referred to as "black spot" 1n this country). Subsequent culture of the spores (found by Brown) on slices of healthy fruit resulted in growth of Mucor racemosus. Brown regarded an invasion by this fungus as a primary cause of the disease. Intro. p. 1.
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The voluntary welfare organisations of the Border and Transkei: a contribution to the sociology of social work

- Bettison, D G

Authors: Bettison, D G
Date: 1956
Subjects: Social service -- South Africa -- Transkei Social service -- South Africa -- Eastern Cape Volunteer workers in social service
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:3314 , http://hdl.handle.net/10962/d1003102
Description: This research is intended to examine the internal organisational structure of the existing [voluntary welfare] organisations to ascertain what relationship may prove effective between themselves and the [Border Local Welfare] Board. This aim introduced the need to ascertain whether a) the organisations in any town were connected with organisations in other towns or to a central administrative office either in the area of investigation or outside it; or b) the organisations of any town were simply ad hoc units unrelated to any other organisation or similar organisations elsewhere. If the latter were the case then the difficulty of co-ordination and representation on the Board could probably be no better arranged than an ad hoc system as at present. If, however, the former was the predominant pattern, then it would suggest other and more convenient means to the end in view. Fourthly, it was hoped to gain some knowledge of the fund raising methods of welfare organisations, the nature of the people controlling them, the attitudes of managing committees to social work, and what they thought a case work agency should do; and, lastly, some indication of the history of social work as practised by the voluntary agencies in the area of investigation. These latter topics were not intended to form the principal subject matter of the work. They have not been treated fully in the text, but the information gathered has been included in appropriate places throughout.
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