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  • Nematoda  (2)
  • nettle water  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The absence of a permanent nematode fauna in Baltic rock pool ecosystems
    Amsterdam : Elsevier
    Estuarine and Coastal Marine Science 9 (1979), S. 797-800 
    Details
    ISSN: 0302-3524
    Keywords: Baltic Sea ; Nematoda ; abundance ; rock pools
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Geography , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0302-3524(79)80012-2
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The role of bacteria in pH increase of nettle water (1989)
    Springer
    Plant and soil 113 (1989), S. 137-140 
    Details
    ISSN: 1573-5036
    Keywords: bacteria ; nettle water ; pH-increase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The investigation was designed to elucidate and explain the pH increase observed when a water extract of stinging nettle,Urtica dioica, was supplied to plants grown in sand or peat culture. The pH, bacterial number, organic acid content, and NH 4 + and NO 3 − content were determined in aerated nettle water, sterilised (UV-treated) nettle water and nutrient solution at intervals during 48 h. The pH increase was closely linked to increase in aerobic bacteria and the simultaneous decrease in organic acids and NH 4 + concentration in the media. Consequently, the pH rise in nettle water is due to consumption of organic acids by bacteria and the accompanying shift of the acid-base equilibrium towards a more basic state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181933
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ecology of benthic and epiphytic nematodes in brackish waters (1984)
    Springer
    Hydrobiologia 108 (1984), S. 201-217 
    Details
    ISSN: 1573-5117
    Keywords: Nematoda ; benthal ; phytal ; detritus ; adaptations ; estuaries
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Abundances of benthic nematodes from shallow waters in Tvärminne, Finland and in Ringkøbing Fjord, Denmark averaged 1.2–1.5 106 individuals m−2. Less than 20 species were found. More than 80% of the individuals were made up by Anoplostoma viviparum, Chromadorita fennica, Axonolaimus spinosus, Daptonema trabeculosum and Sabatieria pulchra. S. pulchra is designated as an anoxybiotic species and is attracted to the root tips of young Potamogeton perfoliatus, whilst A. viviparum and C. fennica are oxybiotic species. Abundance of epiphytic nematodes extracted from submerged macrophytes in the Cladophora-Pilayella belt in the outer archipelago of the Finnish archipelago (July 1978) was estimated to reach 5 · 106 individuals m−2, equivalent to a biomass of 1.2 g org. C m−2. Abundance and biomass are smaller in the Potamogeton meadows in the inner archipelago, in littoral algal vegetation of the sea zone, and on sublittoral vegetation. Epiphytic nematode species composition is influenced by salinity and food availability and not by physiognomic types or silt contents of the vegetation in the Baltic Sea, European estuaries and lakes. Dominant species are: Chromadorina bioculata, Punctodora ratzeburgensis, Chromadorita tenuis, Adoncholaimus thalassophygas, Theristus acer, Monhystera parva, M. aff. filiformis and Chromadora aff. nudicapitata. A theory is proposed to explain observed seasonal changes in the species composition of epiphytic and benthic nematodes. During winter months, the submerged vegetation is mostly destroyed, being found as detritus on the sea bottom. Sampling benthic nematodes during winter thus includes epiphytic species living in the detritus. In spring the epiphytic nematodes detect the newly growing vegetation, leave the sea bottom, colonize the submerged vegetation and spend their life there.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00006329
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  • 4
    Electronic Resource
    Electronic Resource
    Uptake and transport of N, P and K in tomato supplied with nettle water and nutrient solution (1988)
    Springer
    Plant and soil 107 (1988), S. 189-196 
    Details
    ISSN: 1573-5036
    Keywords: exudation ; nettle water ; NPK uptake ; pH changes ; Solanum lycopersicum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Water extract of stinging nettle (Urtica dioica) has a growth stimulating effect on plants. This investigation elucidated effects of nettle water on uptake and transport of N, P and K. Tomato plants (Solanum lycopersicum L. cv. Dansk export) were grown in sand culture 6–8 weeks. Plants were supplied with nettle water and nutrient solution was used as a control medium. Uptake and transport of N, P and K+ were determined with isotopes (15N,32P and86Rb+ as a tracer for K+) and ion-selective electrodes and in exudation experiments. A 15% higher uptake of nitrogen (15N assay) was found after nettle water treatment compared with the nutrient solution control. The total amount of nitrogen was also higher in plants cultivated with nettle water. Transport of inorganic and organic nitrogen, measured in exudation experiments, was more than 50% higher for plants supplied with nettle water compared with plants supplied with nutrient solution. In contrast, nettle water had no effect on uptake, transport or total amount of phosphorus and potassium in the plants. Experiments in hydroculture showed that nettle water had a strong pH-elevating effect. Uptake of NH 4 + was strongly stimulated by nettle water compared with nutrient solution. By holding pH at a constant level during the uptake period for 6 h, the uptake of NH 4 + from nettle water was significantly lower when no adjustment of pH was made. Consequently a good deal of the NH 4 + uptake enhancement by nettle water could be explained by pH-stimulation. Assays with the uncoupler/inhibitor 2,4-dinitrophenol (DNP) and dichlorophenyl-dimethyl-urea (DCMU) showed that uptake of nitrogen from nettle water was less metabolically-linked than uptake from a corresponding nutrient solution. All together, nettle water seems to stimulate the uptake of nitrogen, but not phosphorus or potassium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370546
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    Paper (German National Licenses)
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