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  • 1
    Electronic Resource
    Electronic Resource
    Zeta potential measurements of cell wall preparations from Regnellidium diphyllum and Nymphoides peltata (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 13 (1990), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Cell wall particles were prepared from the semi-aquatic plants Regnellidium diphyllum and Nymphoides peltata with minimum disruption to the integrity of the cell wall. The behaviour of freshly-prepared and frozen-thawed particles in a D.C. electric field was monitored with a microscope attached to video recording apparatus. From the respective particles mobility in a well-defined electric field. it was possible to determine their electrostatic potential and consequently estimate the corresponding surface charge density. Experiments were performed in media of different pH and cation concentration (ie, K+ Ca2+). A significant electronegative potential was found in cell wall preparations of both plants. Freezing and thawing further reduced the electrostatic potential for both plant species in all the media utilized for electrophoresis. A reduction of pH or an increase of the cation concentration was found to neutralize the electrostatic potential in a sigmoidal fashion. Ca2+ was more than 10 times more effective than K+ at neutralizing the apparent electrostatic potential of the cell wall preparations. Regnellidium was found to have a lower electrostatic potential than Nymphoides, although both responded in a similar manner to the various treatments. The possible relevance of the cell wall electrostatic potential, pH and [Ca2+] and particularly their inter-relationship is discussed for the two species of plants in terms of their differing growth responses to the ionic environment of the plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1990.tb01321.x
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  • 2
    Electronic Resource
    Electronic Resource
    Barley straw as an inhibitor of algal growth I: studies in the Chesterfield Canal (1990)
    Springer
    Journal of applied phycology 2 (1990), S. 231-239 
    Details
    ISSN: 1573-5176
    Keywords: straw ; algal inhibition ; Cladophora glomerata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The presence of rotting barley straw in a dis used canal reduced the amount of filamentous algae. No effect on algae was observed during the first season after the introduction of straw but algae were decreased in three subsequent years. Algal growth on microscope slides suspended in the water downstream of the straw was reduced by 90%, compared with slides upstream of the straw. A similar result was obtained forCladophora glomerata grown in chambers in the canal. Phosphate, nitrate and ammonium concentrations were not altered significantly by the presence of straw, but nitrite concentrations were increased during summer months. Neither the nitrite increase, nor the possibility of pesticides being washed off the straw were considered likely causes of algal growth inhibition. Growth ofC. glomerata was inhibited in cages from which macro-invertebrate grazers were excluded. No obvious deleterious environmental effects were noted and the technique shows promise as a long-term method of controlling algae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02179780
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Barley straw as an inhibitor of algal growth II: laboratory studies (1990)
    Springer
    Journal of applied phycology 2 (1990), S. 241-248 
    Details
    ISSN: 1573-5176
    Keywords: straw ; algal inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The presence of rotting barley straw in water inhibited the growth of several planktonic and filamentous algae in laboratory culture. The inhibitory effect was produced progressively during decomposition of the straw at 20 °C and reached a maximum after six months. When the straw was autoclaved, all inhibitory activity was lost. Algae recovered and continued to grow normally when transferred from cultures containing rotting straw to sterile culture medium. Addition of liquor from rotting straw also inhibited algal growth. The capacity to inhibit growth remained in the liquor after passage through a 0.2 ,μm filter but was removed by activated carbon. The inhibitory effect of straw shows promise as a practical means of limiting the growth of a range of algae which can cause problems in aquatic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02179781
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Role of phenolic compounds in the antialgal activity of barley straw (1994)
    Springer
    Journal of chemical ecology 20 (1994), S. 1557-1569 
    Details
    ISSN: 1573-1561
    Keywords: Algal inhibition ; phenolics ; oxidized phenolics ; quinones ; barley straw ; Microcystis ; Chlorella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Barley straw decomposing in well-aerated water releases a substance(s) that inhibits algal growth. Phenolic compounds are toxic to algae but are unlikely to be present in sufficient quantities to account for the extended antialgal action of straw. However, straw is antialgal under conditions that may promote oxidation of phenolic hydroxyl groups to quinones; tannins are antialgal under similar conditions. The toxicity of authentic quinones towardsMicrocystis is confirmed; the quinones are some 103 times more antialgal than phenolic acids. The possibility that oxidized lignin derivatives may be involved in straw toxicity towards algae is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02059880
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    Paper (German National Licenses)
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