Articles by Author: Hf Van Der Bank

Search results for Hf Van Der Bank

We found 30 results for you
  1. Measurement of exchangeable aluminium in soils and clay minerals by isotopic exchange

    Measurement of exchangeable aluminium in soils and clay minerals by isotopic exchange

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Isotopically exchangeable Al was determined in soils and clay minerals by equilibration with 28Al. Best results were obtained with a weak extractant and an equilibration time of eight min. The calculated amount of isotopically exchangeable Al was independent of the...
  2. A PRELIMINARY BIOCHEMICAL GENETIC STIJDY OF TWO POPULATIONS OF <em>LITHOGNATHUS AURETI</em> (PERCIFORMES: SPARIDAE)

    A PRELIMINARY BIOCHEMICAL GENETIC STIJDY OF TWO POPULATIONS OF <em>LITHOGNATHUS AURETI</em> (PERCIFORMES: SPARIDAE)

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Two populations of Lithognathus aureti were electrophoretically analysed to determine the extent of genetic divergence between, and variation within them. Gene products of 35 protein coding loci showed no fixed allele differences between these populations. However, significant genotypic differentiation between...
  3. GENETIC VARIATION IN TWO POPULATIONS OF THE ORANGE ROUGHY <em>(HOPLOSTETHUS ATLANTIC US)</em> FROM NAMIBIA

    GENETIC VARIATION IN TWO POPULATIONS OF THE ORANGE ROUGHY <em>(HOPLOSTETHUS ATLANTIC US)</em> FROM NAMIBIA

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The orange roughy (Hoplostethus atlanticus) is a relatively new commercially exploited fish species, but it is currently ranked third amongst the world's top five seafood products. Gene products of 22 protein coding loci in two populations off the coast of...
  4. Phylogenetic relationships between <em>Synodontis</em> species: some preliminary results

    Phylogenetic relationships between <em>Synodontis</em> species: some preliminary results

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The aim of this study was to identify genetic markers and morphological characters to distinguish Synodontis species, because certain species are extremely difficult to identify due to the taxonomically unreliable nature of prominent morphological features. Fixed allele mobility differences were...
  5. Genetic varaiation within and differentiation between <em>Pseudobarbus quathlambae</em> (Pisces, Cyprinidae) populations from the Senqunyane, Jordane and Bokong Rivers (Central Lesotho)

    Genetic varaiation within and differentiation between <em>Pseudobarbus quathlambae</em> (Pisces, Cyprinidae) populations from the Senqunyane, Jordane and Bokong Rivers (Central Lesotho)

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Horizontal starch-gel electrophoresis was used to obtain baseline genetic information on critically endangered Pseudobarbus quathlambae populations in the Senqunyane, Jordane and Bokong Rivers in the Lesotho Highlands. Allelic frequencies were similar between the populations and generations studied. However, allele classes...
  6. A morphological key for the identification of southern African <em>Synodontis</em> species Cuvier, 1816 (Teleostei: Mochokidae)

    A morphological key for the identification of southern African <em>Synodontis</em> species Cuvier, 1816 (Teleostei: Mochokidae)

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The identification of the southern African Synodontis species is hampered by variable and overlapping morphological characteristics such as colour, pigmentation patterns and morphometric ratios. Species are often misidentified due to the complicated nature of the present identification keys. The morphological...
  7. Phylogenetic relationships between some African Characidae, Disticho-dontidae and Hepsetidae: results of allozyme and mtDNA data analyses

    Phylogenetic relationships between some African Characidae, Disticho-dontidae and Hepsetidae: results of allozyme and mtDNA data analyses

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The present study considers phylogenetic relationships of some southern, eastern and western African Characidae, Distichodontidae and Hepsetidae species, for which only limited genetic data with respect to their classification and phylogeny are currently available. Thirteen species representing three families and...
  8. Is caudal fin colour in tigerfish <em>Hydrocynus vittatus</em> a sex or population trait?

    Is caudal fin colour in tigerfish <em>Hydrocynus vittatus</em> a sex or population trait?

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Tigerfish caudal fin colours vary from yellow to red, with distinct dissimilarities previously noted. To understand these colour differences, tigerfish were collected during 2008 to 2010 from four southern African populations in the Upper Zambezi River (ZAM), Okavango Delta (OKA),...
  9. Does Microfinance Promote Entrepreneurship and Innovation? A Macro Analysis

    Does Microfinance Promote Entrepreneurship and Innovation? A Macro Analysis

    Innovative entrepreneurs in Africa experience a lack of financial support and underdeveloped financial systems. Microfinance could offer a solution to this complex issue. In this respect, this research paper studies the contribution of microfinance to the innovation process through entrepreneurship...
  10. Mobile Money for Financial Inclusion: Policy and Regulatory Perspective in Zimbabwe

    Mobile Money for Financial Inclusion: Policy and Regulatory Perspective in Zimbabwe

    The introduction of mobile telephony and innovative technology in financial services is forcing regulators to re-evaluate their rules for financial service provision. Zimbabwe also adopted mobile financial service, and has realised rapid growth in mobile financial services. Inevitably, it has...