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  • 1
    Electronic Resource
    Electronic Resource
    Kalorimetrische Untersuchungen zum mikrobiellen Abbau schwerlöslicher Schadstoffe am Beispiel von Naphthalin (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 493-502 
    Details
    ISSN: 1572-8943
    Keywords: naphthalene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The bacterial degradation of naphthalene and other PAH in liquid media by pure cultures was investigated by an isothermic flow-calorimeter. Anabolic and catabolic processes were found to be separated distinctly. The phase of exponential heat production was developed only weakly. This was attributed to the low solubility and the dependence of the dissolving rate of substrate as the rate determining step on cristal surface and diffusion. Methodical problems based on the local separation of the fermenter and the measuring cell. Because of the prevented gas exchange in the flow tubes and the enrichment of carbon dioxide metabolic activity of the microorganisms was lowered for times. The differences between the heat production in the fermenter and the flow tubes were reduced by developing a mathematical model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01983991
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of Calorimetric and Gravimetric Methods to Quantify the Amorphous Content of Desferal (1999)
    Springer
    Journal of thermal analysis and calorimetry 57 (1999), S. 75-85 
    Details
    ISSN: 1572-8943
    Keywords: amorphous phases ; Desferal ; gravimetry ; isothermal microcalorimetry ; recrystallization ; relative humidity ; water vapor sorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The amorphous content of different Desferal samples was quantified by recording its recrystallization using isothermal microcalorimetry in a static as well as in a flowing humid atmosphere. Furthermore water vapor sorption gravimetry was performed for the same purpose. These analytical methods result in a quantitative signal directly dependent on the content of the amorphous phase (recrystallization, water sorption equilibrium). Their sensitivity allows the detection of amorphous content below 1%. Methods are compared and advantages and disadvantages are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010153401365
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    Paper (German National Licenses)
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