Articles by Keyword: High Seas

Search results for High Seas

We found 43 results for you
  1. Megabenthos and benthopelagic fishes on Southeast Atlantic seamounts

    Megabenthos and benthopelagic fishes on Southeast Atlantic seamounts

    Item type: Journal Article • Journal: African Journal of Marine Science
    In a descriptive study of megafauna of several Southeast Atlantic seamounts, multiple video-transects on upper slopes and summits documented the occurrence of benthic invertebrate taxa, primarily corals, regarded as indicators of vulnerable marine ecosystems (VMEs) as defined in international guidelines...
  2. Improving the isolation of actinomycetes from soil by high-speed homogenization

    Improving the isolation of actinomycetes from soil by high-speed homogenization

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Quantitative isolation of actinomycetes from five South African soils with different physical and chemical properties was conducted by hammer-mill comminution followed by high-speed liquid homogenization of resultant soil particles using a shaft homogenizer. Soil homogenates were serially diluted and plated...
  3. TOXIC CONCENTRATION OF FREE AMMONIA TO <em>BRACHIONUS CALYCIFLORUS</em> PALLAS, A ROTIFER PEST SPECIES FOUND IN HIGH RATE ALGAL PONDS (HRAP's)

    TOXIC CONCENTRATION OF FREE AMMONIA TO <em>BRACHIONUS CALYCIFLORUS</em> PALLAS, A ROTIFER PEST SPECIES FOUND IN HIGH RATE ALGAL PONDS (HRAP's)

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Laboratory tests on Brachionus calyciflorus Pallas indicate that at low concentrations of free ammonia (< 7 mg l −1) pH levels up to 9,85 could be tolerated for 96 h without apparent ill effect. Free ammonia concentrations > 14,4 mg...
  4. COUNTING NATURAL POPULATIONS OF <em>MICROCYSTIS AERUGINOSA:</em> A SIMPLE METHOD FOR COLONY DISRUPTION INTO SINGLE CELLS AND ITS EFFECT ON CELL COUNTS OF OTHER SPECIES

    COUNTING NATURAL POPULATIONS OF <em>MICROCYSTIS AERUGINOSA:</em> A SIMPLE METHOD FOR COLONY DISRUPTION INTO SINGLE CELLS AND ITS EFFECT ON CELL COUNTS OF OTHER SPECIES

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    A rapid, high-speed blending method for disrupting colonies of the cyanobacterium Microcystis aeruginosa to single cells in preparation for cell counts is described. Cell counts obtained for treated samples of natural populations of M. aeruginosa from Hartbeespoort Dam did not...
  5. Impacts of non-selective grazing on cover, composition, and productivity of Nama-karoo grassy shrubland

    Impacts of non-selective grazing on cover, composition, and productivity of Nama-karoo grassy shrubland

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The non-selective rotational grazing system has undergone a long and controversial development. The merits of this grazing system, where relatively large numbers of livestock are herded into numerous small paddocks for short timespans with long rests between grazings, have not...
  6. Home Brewed Alcohol use Among High School Students in a Rural South African Community

    Home Brewed Alcohol use Among High School Students in a Rural South African Community

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    This study investigates the use of home brewed alcoholic beverages among adolescents in high schools in a rural community in South Africa. There is much concern about alcohol misuse among young people and very little information exists on alcohol produced...
  7. Perceptions of High-risk Sex Among Men and Women Attending an STI Clinic in Cape Town, South Africa

    Perceptions of High-risk Sex Among Men and Women Attending an STI Clinic in Cape Town, South Africa

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    The widespread occurrence of sexually transmitted infections (STI's) among young adults in South Africa suggests that there is a need to increase safe sex practices among those who are sexually active. Given the high rate of HIV infection in the...
  8. Functions Served by Corporal Punishment: Adolescent Perspectives

    Functions Served by Corporal Punishment: Adolescent Perspectives

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    This exploratory study investigated the functions served by corporal punishment as perceived by high school students in a developing country. A qualitative research design was used. Participants were a convenient sample of five high school students. Data were collected using...
  9. Sexual Activity Among Rural High School Students in Zimbabwe: Results and Implications for HIV Prevention

    Sexual Activity Among Rural High School Students in Zimbabwe: Results and Implications for HIV Prevention

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    This study surveyed sexual activity among Zimbabwean teenagers with a view to assisting them adopt safe sexual practices in the face of the HIV\AIDS pandemic. Participants were 200 high school students (females = 50%; mean age = 16.7%, SD =...