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  • Springer  (4)
  • 1995-1999  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cell biology and toxicology 11 (1995), S. 119-128 
    ISSN: 1573-6822
    Keywords: dipalmitoyl phosphatidyl choline ; kaolin ; P388D1 ; quartz ; surfactant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The macrophage-like cell line, P388D1, was exposed to dipalmitoyl lecithin (DPL)-coated respirable quartz and kaolin, and the disappearance of the DPL was monitored for up to 9 days. The coating was removed rapidly at first (about 50% in the first 3 days) and then more slowly over the remaining 6 days, until about 30% remained on day 9. The rate of DPL digestion was independent of the type of dust and the amount of coated dust within the cell, indicating the existence of an extracellular phospholipase activity. This extracellular phospholipase activity was partially characterized. It was sensitive to temperatures above 56°C, the presence of EDTA, the action of the proteases trypsin and proteinase K, and pH, being active at pH 7 but not at pH 5. This is consistent with reports in the leterature of the existence of an extralysosomal phospholipase which is active at pH 7 and dependent on the presence of divalent metal ions. There was a dust-dependent difference in the extracellular rate of DPL digestion from quartz and kaolin. The coating was removed more slowly from the kaolin than it was from quartz. The removal of the DPL coating seen in the presence of cells was presumably due to both an intracellular and an extracellular phospholipase.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5036
    Keywords: root biomass ; shoot biomass ; Sitka spruce (Picea sitchensis) ; cultivation ; mole drainage ; mounding ; surface water gley
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In Ireland much of the land available for plantation establishment requires some degree of soil cultivation and drainage to improve its suitability for tree growth. The method of cultivation and drainage normally varies depending upon the soil type and its drainage characteristics. Little research has been carried out on the impact of practices such as mounding and mole drainage upon rooting and biomass production in young crops. The research reported in this paper was carried out on four sites where the general soil type was surface water gley. Three of the sites studied were afforestations on old farmland, while the fourth site was a reforestation of a windblown stand. The cultivation methods investigated included mounding, mole drainage with mounds, mole drainage only and ripping. Sitka spruce trees ranging in age from five to thirty years were excavated from these experimental sites to describe the impact of different soil cultivation techniques upon root architecture and above and below ground biomass production. The results showed that while the effect of mound drainage upon water table level varied from site to site, the establishment of trees on mounds led to an increase in above and below ground biomass production. Mole drainage of these sites without mounds, did not lead to any increase in root or shoot development when compared with trees growing on uncultivated/undrained ground.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of mathematical sciences 81 (1996), S. 2905-2911 
    ISSN: 1573-8795
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In 1984, C. M. Newman posed the problem of proving the invariance principle in distribution for associated random fields (i. e., fields satisfying the so-called FKG-inequalities)X={Xj, j∈Zd} when d≥3. The solution of this problem for wide-sense stationary associated random fields is obtained here under slightly more restrictive conditions than those used by C. M. Newman and A. L. Wright for the strictly stationary case where d=1 and d=2.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1995-04-01
    Print ISSN: 0742-2091
    Electronic ISSN: 1573-6822
    Topics: Biology , Medicine
    Published by Springer
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