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  • 1
    Electronic Resource
    Electronic Resource
    Hydration of synthetic polypropylenephosphate (PPP) — a simplified model for natural teichoic acids Part 3. Bound (nonfreezing) water in PPP gels by the pulsed Fourier transform NMR method (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 106-112 
    Details
    ISSN: 1435-1536
    Keywords: Polypropylenephosphate ; teichoic acid synthetic model ; bound (nonfreezing) water ; pulsedFourier transformNMR method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The structure and properties of bound water, nonfreezing at low temperature, in polypropylenephosphate (PPP) gels have been studied by the pulsed Fourier transform NMR method. The amount of hydrate water in gels depends strongly on the type of counterions. For PPP in acid and magnesium salt forms this amount was found to be three and eight moles per one mole of phosphate groups, respectively. The shape of a resonance line of bound water protons at low temperature was approximated by the curve of the system of proton pairs of statistically distributed orientations. The distance between two interacting protons in a pair, calculated from NMR spectrum, corresponds to the H-H distance in an isolated water molecule. This means that hydrate water molecules are fixed at hydration sites of polymer phosphate groups at a distance limiting intermolecular proton-proton interaction. The analysis of the NMR signal shape confirms that the structures of the primary hydration layer of phosphodiester groups, proposed in our previous theoretical studies, exist in PPP gels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412753
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of N-immissions on nutrient status and vitality ofPinus sylvestris near a hen-house (1989)
    Springer
    Plant and soil 113 (1989), S. 279-282 
    Details
    ISSN: 1573-5036
    Keywords: forest decline ; nitrogen immission ; nutrient status ; Pinus sylvestris
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Near a hen house (50–600 m), vitality ofPinus sylvestris, N-, P-, K-, Ca-, Mg-contents of the needles, N-, Mg-, K-, Ca- and Al-contents in soil extracts and NH3/NH 4 + -contents of the air were determined. Damage symptoms occurred when N-immissions hit the canopy directly. In contrast no visible decline of the above ground plant could be observed if N was mainly deposited on the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02280193
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    Paper (German National Licenses)
    Fulltext
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