Articles by Author: Louise Johnson

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  1. Incidence of hypoglycaemia among insulin-treated patients with type 1 or type 2 diabetes mellitus: South African cohort of International Operations Hypoglycaemia Assessment Tool (IO HAT) study

    Incidence of hypoglycaemia among insulin-treated patients with type 1 or type 2 diabetes mellitus: South African cohort of International Operations Hypoglycaemia Assessment Tool (IO HAT) study

    Objectives: To assess the incidence and rates of hypoglycaemia in patients with type 1 diabetes mellitus (T1DM) or type 2 diabetes mellitus (T2DM) in the South African cohort of the International Operations Hypoglycaemia Assessment Tool (IO HAT) study.
  2. A vacuum filtration and leaching method for the colorimetric determination of ammonium and nitrate nitrogen in soils

    A vacuum filtration and leaching method for the colorimetric determination of ammonium and nitrate nitrogen in soils

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The extracting solution and soil were separated by using vacuum filtration, followed by continuous leaching. The procedure was evaluated by spiking five different topsoil samples (having a wide range of physical and chemical properties) with ammonium nitrate and determining the...
  3. Utilization of initially-applied labelled ammonium nitrate by three successive crops

    Utilization of initially-applied labelled ammonium nitrate by three successive crops

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The aim of the study was to compare N uptake from initially-applied NH4 + and NO3- ions and to compile a balance sheet for applied fertilizer N. In a pot experiment, maize, sorghum and sunflower plants were grown in succession,...
  4. Effects of sodium sulphate, sodium chloride and manganese sulphate on kikuyu (<em>Pennisetum clandestinum)</em> growth and ion uptake

    Effects of sodium sulphate, sodium chloride and manganese sulphate on kikuyu (<em>Pennisetum clandestinum)</em> growth and ion uptake

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Irrigation with saline water is increasingly practised yet an understanding of plant response to different salt types remains largely elusive. Our study investigated the effects of irrigation with simulated effluent containing three salts on the growth and composition of a...
  5. Effect of timing and concentration of rest breaking agents on budburst in ‘Bing’ sweet cherry under conditions of inadequate winter chilling in South Africa

    Effect of timing and concentration of rest breaking agents on budburst in ‘Bing’ sweet cherry under conditions of inadequate winter chilling in South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effect of timing of various rest breaking agents (RBAs) on vegetative and floral budburst, and production efficiency was investigated on 4-year-old ‘Bing’ sweet cherry trees on ‘Gisela® 5’ rootstock. Two experiments were conducted, near Clarens (28°28’S; 28°19’E, 1860 m.a.s.l)...
  6. SOME RESULTS ON BUDS, STEMS AND FAULT TOLERANCE IN HYPERCUBES OF DIMENSION ⋚ 5

    SOME RESULTS ON BUDS, STEMS AND FAULT TOLERANCE IN HYPERCUBES OF DIMENSION ⋚ 5

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We determine the minimum number of faulty links in a 5-dimensional hypercube so that no 2-dimensional subcube is fault free. The degree sequences of some related extremal graphs are also determined.
  7. Fish response to the annual flooding regime in the Kavango River along the Angola/Namibian border

    Fish response to the annual flooding regime in the Kavango River along the Angola/Namibian border

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The results of the first seasonal survey of the fish of the Kavango River flood-plain along the Angola/Namibia border are reported. The river experiences peak flooding from February through June, with the 375-km long floodplain extending up to 5 km...
  8. Recommendations for the management of subsistence fisheries in South Africa

    Recommendations for the management of subsistence fisheries in South Africa

    Item type: Journal Article • Journal: South African Journal of Marine Science
    This paper summarizes recommendations for the management of previously marginalized and neglected subsistence fisheries in South Africa. The recommendations stem from the activities and analyses of a task group appointed by Government and mandated to provide advice about management of...
  9. Identification of and distinction between the scales of South African pilchard <em>Sardinops ocellatus</em> and Cape anchovy <em>Engraulis capensis</em>

    Identification of and distinction between the scales of South African pilchard <em>Sardinops ocellatus</em> and Cape anchovy <em>Engraulis capensis</em>

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Fossil fish scales hold potential for elucidating past fluctuations in fish populations. Only certain pilchard Sardinops ocellatus and anchovy Engraulis capensis scales can be distinguished easily from each other. Misidentification of the less-typical scales of the two species can introduce...