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  • 1985-1989  (3)
  • Analytical Chemistry and Spectroscopy  (1)
  • Column technology  (1)
  • Drying  (1)
  • Polymer and Materials Science  (1)
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Fluctuations in soil moisture, and plant uptake of surface applied phosphate (1989)
    Springer
    Nutrient cycling in agroecosystems 20 (1989), S. 101-108 
    Details
    ISSN: 1573-0867
    Keywords: Drying ; remoistening ; surface-applied phosphate ; phosphate uptake ; subterranean clover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The mechanisms leading to decreased plant uptake of surface-applied phosphatic fertilizers during short periods of drying were investigated in controlled glasshouse experiments with subterranean clover. Phosphate and water were added differentially to surface and subsurface layers of reconstituted soil profiles. The surface layers were subjected to brief periods of drying and to partial or complete remoistening at frequencies ranging from daily to fortnightly. Phosphorus uptake from surface applications and shoot yield were proportional to the frequency of remoistening of the soil surface to field capacity, and the response to additional subsurface phosphate diminished as the amount of surface water increased. In treatments where moistening did not achieve field capacity, yield was linearly proportional to the amount of water applied to the surface. Watering the surface to field capacity twice a week led to a 50 percent reduction in phosphorus uptake compared with daily watering. Watering twice as frequently with half the amount each time did not affect plant yield or phosphorus uptake. Thus it appeared that rapid phosphorus uptake occurred only at high moisture contents, and that uptake was proportional to the volume of soil brought close to field capacity and the length of time that it remained moist. This indicates that desorption of soil-adsorbed phosphate and its diffusion to plant roots can occur rapidly only at high moisture contents. Similar results were obtained with different soil types when the extractable phosphate was concentrated near the soil surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055434
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Novel fused silica capillary columns: Surface modification through controlled doping of the preform-tube (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 395-400 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography (GC) ; Fused silica ; Column technology ; Surface modification ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method has been developed for fabricating fused silica capillary columns which have specific surface properties but still retain the excellent strength, flexibility, and resilience of pure fused silica. By using the Modified Chemical Vapor Deposition process (MCVD), typically used for the production of optical fiber lightguides, inorganic dopants such as Al, Nd, Ge, and P can be introduced into the preform-tube by MCVD. Doped columns have a wide range of specific surface properties, and columns with undoped fused silica prepared by MCVD are more chemically inert and less acidic than columns prepared by conventional methods. This paper describes the method for fabricating capillaries and the initial studies to characterize them.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240110507
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Combination of ion beam techniques, AES and SIMS for the analysis of samples exposed in the plasma boundary of the JET tokamakPaper presented at the IB-SA88 Meeting, University of Paris VII (Jussieu), 7-8 December 1988. (1989)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 14 (1989), S. 543-551 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: A system combining ion beam and surface-specific techniques for the analysis of probes exposed in the edge region of the plasma produced by the Joint European Torus (JET) is described. Among examples of the use of the system are the demonstration that 10-40% of the ionic charge flux in the boundary can be due to impurities, erosion and redeposition phenomena can be observed with small probes placed in the plasma boundary, and most of the oxygen observed on collector probes is an artefact resulting from exposure to air.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740140909
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    Paper (German National Licenses)
    Fulltext
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