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  • 1
    Electronic Resource
    Electronic Resource
    Effect of cations, including heavy metals, on cadmium uptake by Lemna polyrhiza L. (1995)
    Springer
    BioMetals 8 (1995), S. 95-98 
    Details
    ISSN: 1572-8773
    Keywords: cations ; cadmium ; extracellular binding ; heavy metals ; inhibition kinetics ; intracellular uptake ; Lemna polyrhiza
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Cations, including calcium, magnesium, potassium, sodium, copper, iron, nickel and zinc, inhibited (up to 40%) extracellular binding and intracellular uptake of cadmium by Lemna polyrhiza in solution culture. Test plants showed a high capacity of extracellular cadmium binding which was competitively inhibited by copper, nickel and zinc; however, calcium, magnesium and potassium caused non-competitive inhibition. Iron and sodium increased K m and decreased V max, thereby causing mixed inhibition of extracellular binding. Intracellular cadmium uptake displayed Michaelis-Menten kinetics. It was competitively inhibited by calcium, magnesium, iron, nickel and zinc. Monovalent cations (sodium and potassium) caused non-competitive and copper caused mixed inhibition of intracellular cadmium uptake. Thus, high levels of cations and metals in the external environment should be expected to lower the cadmium accumulation efficiency of L. polyrhiza.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00142006
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Growth, photosynthesis and nitrogen fixation ofAnabaena doliolum exposed to Assam crude extract (1990)
    Springer
    Bulletin of environmental contamination and toxicology 44 (1990), S. 494-500 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01701235
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of assam crude on photosynthesis and associated electron transport system inAnabaena doliolum (1988)
    Springer
    Bulletin of environmental contamination and toxicology 41 (1988), S. 776-780 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02021033
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Algal epilithon and water quality of a stream receiving oil refinery effluent (1989)
    Springer
    Hydrobiologia 184 (1989), S. 193-199 
    Details
    ISSN: 1573-5117
    Keywords: epilithic algae ; stream ; refinery effluent ; species diversity ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in epilithic algal communities colonizing introduced substrata were determined in a stream polluted with oil refinery effluent at Digboi (Assam, India). The number of algal taxa was reduced but the growth of blue-green algae, particularly two species ofOscillatoria, was encouraged. Epilithic biomass (as chlorophylla) also declined at polluted stations. The algal community of the upstream station was markedly different from the community occurring just after the confluence of effluent; however, the differences were gradually reduced downstream, indicating improvement in water quality. Of the various criteria tested for possible relationships with the level of pollutants, species richness, Shannon diversity and biomass showed significant relationships. The study demonstrates the usefulness of algal criteria for monitoring oil pollution in running waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027028
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Algal epilithon and water quality of a stream receiving oil refinery effluent (1989)
    Springer
    Hydrobiologia 184 (1989), S. 193-199 
    Details
    ISSN: 1573-5117
    Keywords: epilithic algae ; stream ; refinery effluent ; species diversity ; water quality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes in epilithic algal communities colonizing introduced substrata were determined in a stream polluted with oil refinery effluent at Digboi (Assam, India). The number of algal taxa was reduced but the growth of blue-green algae, particularly two species ofOscillatoria, was encouraged. Epilithic biomass (as chlorophylla) also declined at polluted stations. The algal community of the upstream station was markedly different from the community occurring just after the confluence of effluent; however, the differences were gradually reduced downstream, indicating improvement in water quality. Of the various criteria tested for possible relationships with the level of pollutants, species richness, Shannon diversity and biomass showed significant relationships. The study demonstrates the usefulness of algal criteria for monitoring oil pollution in running waters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02392956
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Composition and dynamics of epilithic algae in a forest stream at Shillong (India) (1994)
    Springer
    Hydrobiologia 291 (1994), S. 61-74 
    Details
    ISSN: 1573-5117
    Keywords: Canonical Correspondence Analysis ; diatoms ; epilithic algae ; forest stream ; seasonal variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The seasonal dynamics of epilithic algae in a third order pristine forest stream were analyzed over a period of 2 years. Stream water was slightly acidic and nutrient poor. Encrusting, filamentous flocs, and filaments were found. Algal standing crop was high (mean concentration of Chl a 16–43 mg m−2) in spring. Filamentous algae contributed most to standing crop. Diatoms made up over 85% by number of the epilithon. Blue-greens were abundant upstream, and chlorophytes downstream. This shift was ascribed to greater light availability downstream. The community was more diverse during spring. Water current was the most important variable regulating epilithon structure. Total phosphorus (TP), orthophosphate (O-PO inf4 su3– ), silica (Si4+), nitrate (NO inf3 su– ) and conductance correlated negatively with flow rate. Green algae showed a positive correlation to phosphorus during low and stable flow. During rapid runoff, diatoms were the most resistant forms. Seasonal change in the epilithic community was mainly regulated by fluctuations in flow rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024239
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    Paper (German National Licenses)
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