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  • 1
    Digitale Medien
    Digitale Medien
    Cellulose production by planktonic algae in lacustrine environments (1979)
    Springer
    Hydrobiologia 66 (1979), S. 249-258 
    Details
    ISSN: 1573-5117
    Schlagwort(e): phytoplankton ; cellulose ; carbohydrate ; particulate matter ; water column ; lacustrine environment
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Cellulose production by planktonic algae in a eutrophic pond and in an oligotrophic lake was estimated by comparing the amount of cellulose contained in intact algal cells with the amount of cellulose present in the water column. Cellulose contents of laboratory grown algal species representing the dominant cellulose producers were ranged from 2 to 39% of the total dry weight of cell mass, depending upon the species and stage of growth. The relative amounts of cellulose present in the water column ranged from 4 to 50% of the total dry weight of particulate matter. It was estimated that more than 30% of cellulose in the water column was actually contributed by the viable algal cells present during the algal bloom. Despite its algal origin, more cellulose was found in the water column than could be accounted for by the number of algal cells observed. The difference was due to the accumulation of cellulose from previous algal crops. This observation indicated that production of algal cellulose exceeded decomposition and little or no decomposition of cellulosic material took place in the water column.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00020907
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  • 2
    Digitale Medien
    Digitale Medien
    A solvent partitioning procedure for the separation of chlorophylls from their degradation products and carotenoid pigments (1980)
    Springer
    Hydrobiologia 71 (1980), S. 289-293 
    Details
    ISSN: 1573-5117
    Schlagwort(e): Algal chlorophyll ; liquid/liquid partitioning ; chlorophylla ; pheophytina
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A simple liquid/liquid partitioning procedure was developed which employed aqueous acetonitrile and hexane, for the isolation of chlorophyll and pheophytin. This procedure separated these pigments from other interfering pigmented compounds. The efficacy of this solvent separation method was evaluated using commercially available chlorophylla, b, pheophytina, b, carotenoids, and algal pigment extracts. The recovery efficiencies of this solvent partitioning process for chlorophyll a and pheophytina have been shown to be 95–98% and 93–96%, respectively, furthermore, the chlorophylla fraction was practically free of any contaminating pigments. It appears that a more accurate assessment of chlorophylla and pheophytina can be accomplished employing liquid/liquid partitioning than with the present standard method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00686136
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  • 3
    Digitale Medien
    Digitale Medien
    A simplified method for the simultaneous extraction of phytoplanktonic chlorophyll and fecal sterol from water (1979)
    Springer
    Water, air & soil pollution 11 (1979), S. 173-178 
    Details
    ISSN: 1573-2932
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik
    Notizen: Abstract A simple column method employing Amberlite XAD-1 (60–120 mesh) resin for the simultaneous extraction of coprostanol and algal chlorophyll a was proposed and evaluated. The results showed that the efficiencies of the column extraction for these two water quality indicators were comparable to or better than the conventional hexane liquid/liquid partitioning and aqueous acetone extraction for the respective compounds. Furthermore, the column technique was time-saving and more economical.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00286628
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