Articles by Author: Mark E Engel

Search results for Mark E Engel

We found 99 results for you
  1. Invasive and non-invasive group A β-haemolytic streptococcal infections in patients attending public sector facilities in South Africa: 2003–2015

    Invasive and non-invasive group A β-haemolytic streptococcal infections in patients attending public sector facilities in South Africa: 2003–2015

    Item type: Journal Article • Journal: Southern African Journal of Infectious Diseases
    Background: The burden of disease caused by group A streptococcus (GAS) in Africa is largely unknown. The aim of this study was to determine the incidence of invasive (iGAS) and non-invasive GAS (non-iGAS) infections in patients attending the public health...
  2. (Φ, <em>M</em>)–extensions of near-rings

    (Φ, <em>M</em>)–extensions of near-rings

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    In this paper, we define and study a generalization of matrix, polynomial, and group near-rings. New results on ideal essentiality and lying over are obtained.
  3. Approach structures and measures of connectedness

    Approach structures and measures of connectedness

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    Measures of connectedness versus disconnectedness are introduced in anarbitrary topological construct as fixed points of a Galois connection. This places measures of connectedness found in the literature in a general categorical frame-work.
  4. SHORT NOTES

    SHORT NOTES

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
  5. TOWARDS THE SUSTAINABLE WATER QUALITY MANAGEMENT OF AN URBANISED AFRICAN RIVER CATCHMENT: THE KLIP RIVER, GAUTENG, SOUTH AFRICA

    TOWARDS THE SUSTAINABLE WATER QUALITY MANAGEMENT OF AN URBANISED AFRICAN RIVER CATCHMENT: THE KLIP RIVER, GAUTENG, SOUTH AFRICA

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    A water quality impact assessment of Greater Johannesburg's three southern wastewater treatment works was undertaken to quantify present and predict future contributions of pollution to the Klip River, as well as the impact on downstream users. This information is required...
  6. Scale, heterogeneity and secondary production in tropical rangelands

    Scale, heterogeneity and secondary production in tropical rangelands

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Tropical rangelands across the world are experiencing land use intensification pressures which are reducing the spatial scale of grazing management units. There are implications of a reduction in scale on environmental heterogeneity and its relationship with secondary production of large...
  7. South African Adolescents' Career Development through the Lens of the Systems Theory Framework: An Exploratory Study

    South African Adolescents' Career Development through the Lens of the Systems Theory Framework: An Exploratory Study

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    Adolescent career development has predominantly been studied in the context of middle class Eurocentric cultures and there have been calls for greater attention to the career development of non-dominant and disadvantaged groups. Further, there have been calls to explore career...