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  • 1995-1999  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The growth, nitrogen fixation and nutrient removal capacity of Azolla in polluted water (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Lakes & reservoirs 2 (1996), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: The growth and nitrogen fixation of Azolla filiculoides cultured in polluted pond water and two types of secondary effluent were investigated. The gradual decreases in the growth and acetylene reduction activity (ARA) of the plants in pond water were due mainly to a phosphorus deficiency. In the secondary effluent, ammonium was an important factor limiting growth and ARA. Azolla plants were screened for tolerance to ammonium ion on the basis of their growth on the medium with or without ammonium. Azolla nilotica was the most sensitive species of all, followed by A. rubra. Azolla pinnata van pinnata was the most tolerant one. Nutrient removal capacities by 10 Azolla strains in batch culture were examined. The highest capacities and the growth were found in May for all Azolla strains. In August and December, Azolla strains showed poor growth and low nutrient removal capacities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1770.1996.tb00062.x
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation and analysis of gas bubbles in the cavities of Azolla leaves (1995)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 93 (1995), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A procedure has been developed for the isolation of gas bubbles from the cavities of leaves of Azolla rubra. Mature leaves of exponentially growing Azolla plants were carefully cut under water with a razor blade. The gas bubbles in the cavities were driven out by a stream of water running from a glass capillary and collected in another capillary that was filled with distilled water. This allowed the collection of a sufficient number of gas bubbles for analysis. The concentration of oxygen in the gas obtained was slightly lower than that in the external air. The diffusion of external 15N2 into the gas bubbles was low. The concentration of 15N2 in gas bubbles was only 2% of that of the external air even after incubation of Azolla plants in 15N2 in light or in darkness for 20 h.The method described here for isolation and analysis of gas bubbles should permit further studies of the properties of the gas bubbles in the cavities of Azolla leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.1995.930101.x
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