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  • 1990-1994
  • 1985-1989  (2)
  • 1988  (1)
  • 1985  (1)
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Years
  • 1990-1994
  • 1985-1989  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Determination of calcium in chlor-alkali brine by flow injection analysis (1985)
    Springer
    Microchimica acta 87 (1985), S. 393-400 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Determination of Calcium in Chlor-alkali Brine by Flow Injection Analysis A few milligrams of calcium in one liter of chlor-alkali brine were determined by flow injection analysis. When the calcium content was lower, the preconcentration and separation of calcium from sodium chloride with a chelating resin column was employed. The flow injection analysis was based on the exchange reaction between calcium and zinc complex of ethylene glycol-bis(2-aminoethylether)tetraacetic acid (EGTA) in the presence of 2-(3,5-dibromo-2-pyridylazo)-5-[N-ethyl-N-(3-sulfopropyl)amino]phenol(H2R): $$Ca^{2 + } + Zn(EGTA) + 2R \rightleftharpoons ZnR_2 + Ca(EGTA)$$ . Calcium (0.25–2.0 mg 1−1 in the presence of magnesium, iron(III), aluminum, copper(II), nickel, phosphate, chloride, sulfate and carbonate can be determined with a sampling rate of 40 h−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01196839
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The establishment of an intestinal microflora in developing goldfish (Carassius auratus) of culture ponds (1988)
    Springer
    Microbial ecology 15 (1988), S. 333-344 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The bacterial flora in the intestinal tract of goldfish (Carassius auratus) was investigated at different stages of fish development. The floras of the diets and the water and sediment of a culture pond were also analyzed. The total counts in the intestine ranged from 2.2 × 106−2.1 × 108 cells g−1 wet weight.Aeromonas hydrophila, A. punctata, Pseudomonas, Bacteroidaceae andClostridium species were the common components in the intestinal tract of goldfish from larvae to adult stage.Bacteroides type A appeared at 44 days with a density of 103 cells g−1 and then predominated with densities of 105−107 cells g−1. The intestinal microflora of goldfish become relatively stable after 67 days of hatching. These observations suggest that the intestinal microflora of adult goldfish becomes established approximately 2 months after hatching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02012646
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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