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  • 1985-1989  (3)
  • 1935-1939
  • 1905-1909
  • Acute volume expansion  (1)
  • Chemistry  (1)
  • Coal slurry wastewater  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Resetting of tubuloglomerular feedback in acute volume expansion in rats (1988)
    Springer
    Pflügers Archiv 411 (1988), S. 322-327 
    Details
    ISSN: 1432-2013
    Keywords: Tubuloglomerular feedback ; Juxtaglomerular apparatus ; Glomerular filtration rate ; Acute volume expansion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Loss of sensitivity or “resetting” of tubuloglomerular feedback has been reported after both acute and chronic volume expansion in rats. In chronic volume expansion due to dietary salt loading, resetting was found to result from the appearance of an inhibitory factor in tubular fluid. The aim of the present study was to test the possibility that resetting after acute isooncotic volume expansion may also be due to such an inhibitor. Rats were acutely volume expanded (4.5% of body weight) by infusion of a solution of fresh plasma and Ringer's solution. Tubuloglomerular feedback activity was assessed in expanded and control animals by measuring early proximal flow (EPF) rate during perfusion of the loop of Henle at varying rates with proximal tubular fluid harvested from the control (control TF) and expanded animals (AVE TF). When loops of Henle in control animals were perfused with control TF at 10, 20 or 40 nl min−1, EPF fell from (mean ±SD) 29.8±5.6 at zero loop flow to 27.5±7.5, 21.1±4.2 and 15.5±4.5 nl min−1 gKW−1 respectively. Perfusion at the same rates with control TF in expanded animals reduced EPF from 39.5±9.6 (at zero loop flow) to 35.9±11.3, 31.6±4.3 and 22.9±6.8 nl min−1 gKW−1 respectively. When loops of Henle in control animals were perfused with AVE TF, EPF fell from 28.6±9.5 (zero loop flow) to 23.5±8.6, 19.9±8.2 and 15.6±6.5 nl min−1 gKW−1 respectively. Perfusion at these rates with AVE TF in the expanded animals depressed EPF from 36.7±7.8 (at zero loop flow) to 33.6±7.3, 28.6±7.6 and 22.7±8.0 nl min−1 gKW−1 respectively. Since the responses to the two perfusion fluids were the same in each group, it is concluded that there is no inhibitory factor present in AVE TF. Although EPF at each perfusion rate was significantly higher in the expanded animals than in control, the change in EPF per unit change in loop perfusion rate was the same in both groups from which it is concluded that no resetting of tubuloglomerular feedback occurred in the present study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585122
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Biodegradation of coal slurry transport wastewater organics (1987)
    Springer
    Journal of industrial microbiology and biotechnology 1 (1987), S. 319-328 
    Details
    ISSN: 1476-5535
    Keywords: Activated sludge ; Biodegradation ; Coal slurry wastewater
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Activated sludge was successful in reducing the levels of dissolved organic carbon (DOC) in coal slurry wastewaters. DOC removal by the activated sludge ranged from 61% to 97% with a large percentage (21–41%) of this DOC being completely metabolized to CO2. Second order kinetic constants (k 2) developed for DOC removal ranged from 1.39·10−4 to 2.30·10−1 liter·day−1·(mg of sludge)−1, providing evidence that biological treatment was an effective mechanism for reducing the pollution potential of the slurry wastewaters. After treatment with activated sludge a residual DOC remained in the wastewater and data from ultrafiltration studies indicated that this residual carbon was of MW〉1000. The activated sludge preferentially removed the lower (MW〈1000) molecular weight compounds and the higher molecular weight DOC was more resistant to biological attack. However, extended acclimation (greater than 1 month) enabled the activated sludge to remove the higher molecular weight DOC from the slurry wastewaters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01569310
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Fractionating condensation and evaporation in plate-fin devices (1986)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 32 (1986), S. 1116-1124 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A model that describes fractionation with condensation and evaporation in a plate-fin device has been formulated. It is capable of evaluating profiles of composition, temperature, and flow rate for both liquid and vapor streams in an extended surface device. The device may be adiabatic or nonadiabatic and the surface may be incompletely wetted. Compared to experimental measurements, the model predictions showed ± 1 number of transfer unit deviation along the length of the device. The predictions of the top and bottom flow rate ratio showed a 5-10% deviation for adiabatic and condensation runs and a 25% deviation for evaporation runs.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690320708
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    Paper (German National Licenses)
    Fulltext
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