Articles by Author: Mc Van Aardt

Search results for Mc Van Aardt

We found 21 results for you
  1. From Africa to France: two versions of a single African story

    From Africa to France: two versions of a single African story

    Item type: Journal Article • Journal: South African Journal of African Languages
    Content, structure and style are compared in two versions of a single African folk-tale and an attempt is made to correlate their nature and the specific aims known to have presided at their telling. The first is a simple transcription/translation,...
  2. Die formantpatrone van Afrikaanse vokale soos geproduseer deur manlike sprekers

    Die formantpatrone van Afrikaanse vokale soos geproduseer deur manlike sprekers

    Item type: Journal Article • Journal: South African Journal of Linguistics
    Die leemte wat bestaan ten opsigte van die instrumentele ondersoek van Afrikaanse klanke word in hierdie artikel aan-gespreek. Die doel van die ondersoek is die identifikasie van tipiese formantfrekwensies en formantverhoudings van agt Afrikaanse vokale soos geproduseer deur manlike sprekers...
  3. Aerial and Aquatic Respiration in the River Crab <em>Potamonautes Warreni</em> Calman with Notes on Gill Structure

    Aerial and Aquatic Respiration in the River Crab <em>Potamonautes Warreni</em> Calman with Notes on Gill Structure

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The oxygen consumption rate (ṀO2) for Potamonauteus warreni Calman (= Potamon warreni (Calman) kept in 25 °C water was 34,4 μmol 1−1 O2 kg−1 and after 72 hours in 98% R.H. air the rate was 31,9 μmol 1−1 O2 kg−1...
  4. The effects of lead, water hardness and pH on oxygen consumption, plas- ma chlorides and bioaccumulation in the freshwater fish <em>Tilapia sparrmanii</em>

    The effects of lead, water hardness and pH on oxygen consumption, plas- ma chlorides and bioaccumulation in the freshwater fish <em>Tilapia sparrmanii</em>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Closed system respirometry was performed on captive juvenile Tilapia sparrmanii exposed for 96 hours to a range of Pb-acetate concentrations in hard and soft water to determine the effect of Pb in relation to water hardness and pH. For hard...
  5. Acute effects of Cu on oxygen consumption and 96 hr-LC<sub>50</sub> values in the freshwater fish <em>Tilapia sparrmani</em> (Teleostei: Cichlidae) in Mooi River hard water, South Africa

    Acute effects of Cu on oxygen consumption and 96 hr-LC<sub>50</sub> values in the freshwater fish <em>Tilapia sparrmani</em> (Teleostei: Cichlidae) in Mooi River hard water, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The median lethal copper (Cu) concentration (96 hr-LC50) values for acute Cu toxicity for Tilapia sparrmanii (live mass: 30 ± 8g) in Mooi River hard water of dolomitic origin at 20 °C, pH 7.9, was 68.1 μmol l−1. At this...
  6. Quantitative aspects of oxygen and carbon dioxide exchange through the lungs in <em>Ocypode ceratophthalmus</em> (Crustacea: Decapoda) during rest and exercise in water and air

    Quantitative aspects of oxygen and carbon dioxide exchange through the lungs in <em>Ocypode ceratophthalmus</em> (Crustacea: Decapoda) during rest and exercise in water and air

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Ghost crabs Ocypode ceratophthalmus were exercised in air and water to measure CO2 and O2 exchange rates using the method of instantaneous measurements of oxygen consumption rate (MO2) where applicable. Average heart rate increased from 100 to nearly 400 pulses...
  7. Imaging spectroscopy of foliar biochemistry in forestry environments

    Imaging spectroscopy of foliar biochemistry in forestry environments

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Remote sensing estimates of leaf biochemicals provide valuable information on ecosystem functioning, vitality and state at local to global spatial scales. This paper aims to give an overview of the state of the art of foliar biochemistry assessment in general...
  8. Estimating plot-level forest structural attributes using high spectral resolution ASTER satellite data in even-aged <em>Eucalyptus</em> plantations in southern KwaZulu-Natal, South Africa

    Estimating plot-level forest structural attributes using high spectral resolution ASTER satellite data in even-aged <em>Eucalyptus</em> plantations in southern KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    This study assessed the suitability of both visible and shortwave infrared of ASTER reflectance bands and various vegetation indices for estimating forest structural attributes of Eucalyptus species. The study was conducted in even-aged monoculture plantations of E. grandis and E...
  9. Image-based reflectance conversion of ASTER and IKONOS imagery as precursor to structural assessment of plantation forests in KwaZulu-Natal, South Africa

    Image-based reflectance conversion of ASTER and IKONOS imagery as precursor to structural assessment of plantation forests in KwaZulu-Natal, South Africa

    Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science
    Reflectance-converted imagery is a requirement for establishing temporally robust remote sensing algorithms, given the reduction of time-specific atmospheric effects. Thus, in this study image-based atmospheric correction methods for ASTER and IKONOS imagery for retrieving surface reflectance of plantation forests in...