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  • Articles: DFG German National Licenses  (2)
  • Adsorption  (1)
  • Children  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Prospective trial of silicone and polyurethane long-term central lines in children: a requiem for silicone (1992)
    Springer
    Pediatric surgery international 7 (1992), S. 468-470 
    Details
    ISSN: 1437-9813
    Keywords: Children ; Central venous catheters ; Polyurethane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Previous work suggests significant advantages in the use of polyurethane over silicone in central venous catheters (CVC). We present the first prospective, randomised, controlled trial of a polyurethane CVC, Cuff Cath (Viggo-Spectramed, Swindon, UK), against a silicone CVC, Hickman (Davol, Cranston RI), in children. Forty consecutive patients were randomised into two groups. There was no significant difference in age, sex, weight, nutritional state, preoperative sepsis, venous site, or tunnel length in either group of 20 patients. In the Hickman group, during a total of 2,270 catheter days, mean 113 days (4–321), 3 (15%) were removed because of sepsis and 4 (20%) because of blockage. Four (20%) fell out after a mean of 15 days (4–30) and 2 (10%) fractured. In the Cuff Cath group, during a total of 3,047 catheter days, mean 152 (30–364), 2 (10%) were removed because of sepsis and 1 (5%) because of blockage. None fell out or fractured. This represented a significant (P 〈0.001) reduction in blockage, breakage, and dislodgement. We conclude that polyurethane has significant advantages over silicone as a material for the manufacture of paediatric CVCs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00178832
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some aspects of the chemistry of lithium in soils (1980)
    Springer
    Plant and soil 57 (1980), S. 49-60 
    Details
    ISSN: 1573-5036
    Keywords: Adsorption ; Exchangeable lithium ; Lithium ; Plant lithium ; Soil lithium ; Total lithium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A method for the determination of exchangeable lithium using 0.5M NH4Cl is described. The range of exchangeable Li in the fifty Papua New Guinea (PNG) soils analyzed was 0.002 to 0.409 μgg−1 in contrast to five Australian soils which ranged from 0.032 to 0.830 μgg−1. The PNG soils were divided into hill and alluvial soils with average exchangeable Li contents of 0.062 and 0.263 μgg−1 respectively. No significant correlation between total and exchangeable Li was found in either group of soils althoughr=0.67 for the comined data and was significant at the 5% level. From the analysis of three profiles exchangeable Li was found to be at least twice as high (0.27 μgg−1) in surface soils as in subsurface samples (0.10 μgg−1). The average value of the deeper subsoil samples was 0.18 ppm. R mode cluster analysis of the data for village garden soils collected on a sampling grid showed that exchangeable Li was more strongly assoicated with Ca and Mg than with pH, 0.05M EDTA soluble Zn, 0.5M NaHCO3 soluble P or exchangeable Na and K. Computer constructed isographs using the analyses of grid samples from a garden illustrated the association between Li, Ca and Mg and the inverse association with Na. The correlation coefficient between Ca and Li in the ash of three food plants (Gnetum gnemon, Hibiscus abelmoschus andStenochlaena plustris) while not significant on an individual basis, was significant when the data was combined suggesting that the association between these elements in the soil may reflect an association in the ash returned to the soil when the garden was cleared. The correlation coefficient between soil exchangeable Li and Li in plant ash was positive, but not significant. Adsorption experiments over a five-day period demonstrated that Li was strongly adsorbed from solution. On average 63–75% of the adsorbed Li was fixed in a form which was not exchangeable with 0.5M NH4Cl or soluble in 0.05M EDTA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02139641
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    Paper (German National Licenses)
    Fulltext
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