Articles by Keyword: Lt Em Gt Microcystis Aeruginosa Lt Em Gt

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  1. A COMPARISON OF MULTIPLE CONTAINER AND TUBULAR SYSTEMS FOR THE LARGE SCALE LABORATORY CULTURE OF UNICELLULAR ALGAE

    A COMPARISON OF MULTIPLE CONTAINER AND TUBULAR SYSTEMS FOR THE LARGE SCALE LABORATORY CULTURE OF UNICELLULAR ALGAE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    It is pointed out that due to its construction a tubular system has many advantages, compared to a multiple container system. The most important being the ease of manipulation and the higher yield of algal material. The tubular system has...
  2. A SPECIFIC ULTRAVIOLET ABSORBANCE BAND OF <em>MICROCYSTIS AERUGINOSA</em> TOXINS

    A SPECIFIC ULTRAVIOLET ABSORBANCE BAND OF <em>MICROCYSTIS AERUGINOSA</em> TOXINS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    It could be shown that toxic fractions of Microcystis aeruginosa extracts always had a 240 nm absorbance band, There was a linear relationship between toxicity and UV absorbance at 240 nm of extracts from different isolates of Nicrocystis. One ml...
  3. TOXIN EXTRACTION FROM THE BLUE-GREEN ALGA <em>MICROCYSTIS AERUGINOSA</em> BY DIFFERENT EXTRACTION MEDIA

    TOXIN EXTRACTION FROM THE BLUE-GREEN ALGA <em>MICROCYSTIS AERUGINOSA</em> BY DIFFERENT EXTRACTION MEDIA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The extractability of toxin from Microcystis aeruginosa isolate UV-006 by different extraction media such as O, 1N HC1, 2N CH3COOH, Triton X-100 and water at different pH levels was investigated. The best recovery of toxin was achieved with water at...
  4. CAROTENOID COMPOSITION AS TAXONOMIC CHARACTER FOR <em>MICROCYSTIS</em> ISOLATES

    CAROTENOID COMPOSITION AS TAXONOMIC CHARACTER FOR <em>MICROCYSTIS</em> ISOLATES

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Nineteen Microcystis aeruginosa isolates, a Microcystis incerta and a Synechococcus grown under constant conditions were analyzed for pigment composition. The carotenoid composition of Microcystis incerta and a Synechococcus isolate differed markedly from that of the other isolates. Although there were...
  5. 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...
  6. 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

    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...
  7. THE EFFECT OF TEMPERATURE ON SPECIFIC GROWTH RATE AND ACTIVATION ENERGY OF MICROCYSTIS AND SYNECHOCOCCUS ISOLATES RELEVANT TO THE ONSET OF NATURAL BLOOMS

    THE EFFECT OF TEMPERATURE ON SPECIFIC GROWTH RATE AND ACTIVATION ENERGY OF MICROCYSTIS AND SYNECHOCOCCUS ISOLATES RELEVANT TO THE ONSET OF NATURAL BLOOMS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    To investigate the correlation between temperature and the appearance of Microcystis blooms in nature, the effect of temperature on the growth of four Microcystis izolates (two toxic and two non-toxic) was investigated. The lower temperature limit for Microcystis varied between...
  8. THE EFFECT OF AGITATION AND TURBULENCE OF THE GROWTH MEDIUM ON THE GROWTH AND VIABILITY OF MICROCYSTIS

    THE EFFECT OF AGITATION AND TURBULENCE OF THE GROWTH MEDIUM ON THE GROWTH AND VIABILITY OF MICROCYSTIS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Observation of natural blooms of Microcystis, suggested that increased turbulence plays a role in retarding bloom formation of Microcystis. In laboratory experiments the influence of turbulence mediated by a magnetic stirrer on the growth and viability of Microcystis in batch...
  9. MASS CULTURE OF <underline>MICROCYSTIS</underline> UNDER STERILE CONDITIONS

    MASS CULTURE OF <underline>MICROCYSTIS</underline> UNDER STERILE CONDITIONS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The design and use of a 601 all-glass culture system for the mass production of Microcystis (or other unicellular algae) under sterile conditions, are described. Bleaching and lysis of the cells could be prevented by controlling the pH and CO2...
  10. THE OCCURRENCE OF <em>MICROCYSTIS AERUGINOSA</em> IN THE BOTTOM SEDIMENTS OF A SHALLOW EUTROPHIC PAN

    THE OCCURRENCE OF <em>MICROCYSTIS AERUGINOSA</em> IN THE BOTTOM SEDIMENTS OF A SHALLOW EUTROPHIC PAN

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Sediment samples, collected from Jan Smuts Park Dam in Brakpan, Transvaal, during winter months were incubated in culture medium in the laboratory and found to contain viable Microcystis aeruginosa Kütz. emend. Elenkin colonies. The results obtained, indicate that the alga...