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Now showing items 21-40 of 4834

Viruses in renovated waters

Author: Nupen, EM Date: Jun 1974 This paper attempts to assess the present and future needs for such waters and the virus risk involved in their usage. Read more
Account of the littoral diatoms from Langebaan, Saldanha bay, Cape province, South Africa

Author: Giffen, MH Date: 1975 The diatom flora from several stations on the eastern shore of Saldanha Bay (South Africa) has been studied. Saldanha bay is situated on the western coast of South Africa 110Km north of Cape Town. Read more
Technique for smoothing free-flight oscillation data.

Author: Beyers, ME Date: 1975 A technique based on superposition of tricyclic solutions has been proposed for smoothing free-flight angular motion. When incorporated into a conventional tricyclic data reduction program, the method is convenient to use and does not require ... Read more
Further account of the marine littoral diatoms of the Saldanha Bay Lagoon, Cape province, South Africa

Author: Giffen, MH Date: 1976 This paper deals with the continuation of an investigation of the marine littoral diatom flora of the Saldanha bay Lagoon, situated on the west coast of South Africa. Read more
Eutrophication levels of some South African impoundments III. Roodeplaat Dam

Author: Steyn, DJ ; Toerien, DF ; Visser, JH Date: Jan 1976 Algal bioassays indicated that the waters of Roodeplaat dam are severely eutrophied since algal growth potentials (AGP) of up to 200 mg/l and batch culture algal growth rate of up to 2,2 d were registered with selemastrm capricornutum as test ... Read more
Eutrophication levels of some South African impoundments. IV. Vaal Dam

Author: Steyn, DJ ; Toerien, DF ; Visser, JH Date: Apr 1976 The purpose of this study was to determine the present eutrophication levels of the Vaal dam, to determine how it might be affected by increased discharged of secondary treated sewage effluents Read more
Observations on algal populations in an experimental maturation pond system

Author: Shillinglaw, SN ; Pieterse, AJH Date: 1977 A dense algal population is of primary importance in sewage maturation ponds for the removal of plant nutrients, especially ammonia and orthophosphate. In the Republic of South Africa and in South West Africa sudden algal population declines ... Read more
Components of electrically small loop antennae: 1

Author: Bowles, BA ; Austin, BA ; Attwell, CWP Date: Nov 1978 The paper outlines the fundamentals of underground radio transmission with particular emphasis on loop antennas Read more
Components of electrically small loop antennae: 2

Author: Bowles, BA ; Austin, BA ; Attwell, CWP Date: Dec 1978 The paper describes the properties of matching networks employed which determine the most desirable network Read more
Two-stage optimization in a transportation problem

Author: Stewart, TJ ; Ittmann, HW Date: 1979 A study of the economic distribution of maize throughout South Africa is reported. Although the problem of minimizing total transportation costs in such a situation is a classical one, and its solution is well known, there was in this case a ... Read more
Small loop antenna analysis: Computer program

Author: Bowles, BA ; Attwell, CWP Date: Nov 1979 The authors present a computer program which analyses an electrically small loop antenna having a capacitive matching network Read more
Observations on the ecology growth and physiology of microcystis aeruginosa in the laboratory and in the field

Author: Scott, WE Date: 15 Nov 1979 As a result of potential toxin production the blue-green alga microcystis aeruginosa is a serious problem in eutrophic impoundments in South Africa. This study reports on growth characteristics of M. aeruginosa in the laboratory and is ... Read more
Capturability in a two-target "Game of two cars"

Author: Getz, WM ; Pachter, M Date: 1981 The regions of capturability and draw are derived for a two-target pursuit-evasion differential game of two cars. Specifically, using geometric arguments, complete barrier surfaces are constructed that emanate from the boundaries of the usable ... Read more
Diatoms of the jukskei-crocodile river system (transvaal, republic of South Africa): a preliminary check list

Author: Schoeman, FR Date: 1982 Durring the year 1972 to 1975 samples of benthic algae were collected from 22 selected river stations in the Juskei-Crocodile river system. Some 250 diatoms taxa were identified from these samples Read more
Nutritive value of Mopanie worms

Author: Dreyer, JJ ; Wehmeyer, AS Date: Jan 1982 The use of the caterpillar of the Mopanie moth (Conimbrasia belina) as a food by the Pedi nation has been described in detail by Quin, who also recorded data on the average weight and moisture, protein and fat contents of the fresh caterpillars. ... Read more
Limnological studies on the Pretoria Salt Pan, a hypersaline maar lake

Author: Ashton, PJ ; Schoeman, FR Date: 1983 The Pretoria Salt pan is shallow and alkaline with pronounced mesothermy at a depth of between 0.55 and 0.7 metres. Secchi disc transparencies ranged from 7 to 19 cm. Endorheic or closed drainage basins are widely distributed in many climate ... Read more
Contribution to the floral anatomy of leptospermum laevigatum

Author: Joshnson, CT Date: 1983 A description for the flora is given. The anther is characterized by a prominent oil gland at the tip of the connective. The structure of the seed coat of the fertile and sterile seed differs. Most of the integumental tissue is destroyed ... Read more
Contribution to the Diatom flora of Southern Africa. II. Diatoms from the Hog's Back Region of the Amatola Mountains, Eastern Cape Province, South Africa

Author: Malcolm, HG Date: 1984 This paper deals with the diatoms flora of the Hog's Back region of the Amatola Mountains in the Eastern Cape Province, South Africa. These mountains form part of the Great winterberg Range which constitutes a portion of the escarpment of the ... Read more
Amphora coeffeaeformis (Agardh) Kutzing: a revision of the species under light and electron microscopy.

Author: Archibald, REM ; Schoeman, FR Date: 1984 Amphora coeffeaeformis (Agardh) Kutzing is frequently found in brackish water. However, different concepts of this species found in the literature lead to confusion with respect to its true identity. In this study Agardh’s type material from ... Read more
The diatom flora in the vicinity of the Pretoria Salt Pan, Transvaal, Republic of South Africa. Part III (final)

Author: Schoeman, FR ; Archibald, REM ; Ashton, PJ Date: 12 Mar 1984 This is the third and final contribution on the diatom flora recorded in the vicinity of the pretoria salt pan. In the taxonomic section notes and illustrations (light and electron microscopy) are given for 19 of the 35 listed species. Read more

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