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  • 1
    Electronic Resource
    Electronic Resource
    Repression of galactose utilization by glucose in the citrate-producing yeastCandida guilliermondii (1993)
    Springer
    Journal of industrial microbiology and biotechnology 11 (1993), S. 143-146 
    Details
    ISSN: 1476-5535
    Keywords: Citric acid production ; Candida guiliermondii ; Galactose ; Glucose ; Catabolite repression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A strain of the yeastCandida guilliermondii has been shown to produce citric acid from galactose to a similar extent, and at a similar rate, as from glucose. At an initial concentration of 36 g/l of either glucose or galactose, citric acid production exceeds 13 g/l. When galactose and glucose are present in a mixture, however, galactose utilization is delayed until most of the glucose has been utilized, providing evidence for catabolite repression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01583714
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of the degradation of organotin stabilizers in poly(vinyl chloride) during gamma irradiation (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 1 (1987), S. 311-317 
    Details
    ISSN: 0268-2605
    Keywords: Organotin stabilizers ; Dibutyltin ; PVC ; Polymers ; Gamma irradiation ; Degradation ; Dealkylation ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organotin stabilizers of the type Bu2SnX2 (X = SCH2CO2C8H17 or O2CCH=CHCO2C8H17) present in poly(vinyl chloride) (PVC) and subjected to varying doses of gamma irradiation in the range 1-200 kGy (0.1-20 Mrad) are shown to suffer degradation with dealkylation to form monobutyltin trichloride and tin(IV) chloride, which have been characterized by a subsequent alkylation procedure followed by gas chromatographic analysis. The extent of degradation of the stabilizers on prolonged gamma irradiation is much more severe than during thermal degradation leading to comparable blackening of the polymer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590010404
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  • 3
    Electronic Resource
    Electronic Resource
    A 119mSn variable-temperature Mössbauer study of tin(IV) chloride and dibutyltin dichloride when dispersed in a poly(vinyl chloride) matrix (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 1 (1987), S. 319-323 
    Details
    ISSN: 0268-2605
    Keywords: Mössbauer ; Dibutyltin dichloride ; PVC ; Polymers ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Variable-temperature Sn-119m Mössbauer studies of tin(IV) chloride (SnCl4) and dibutyltin dichloride (Bu2SnCl2) when dispersed in a poly(vinyl chloride) (PVC) matrix have been interpreted using a Debye model. Recoilless fractions have been determined which indicate that at 80 K the Mössbauer technique is nearly three times as sensitive to the presence of SnCl4 compared with Bu2SnCl2 within the poly(vinyl chloride) matrix. These observations have been explained in terms of structural changes occurring on dispersion in the polymer matrix which result in the tin atom in tin(IV) chloride becoming six-coordinate whereas that in dibutyltin dichloride reduces its coordination to five. The implications of these results for future applications of Mössbauer spectroscopy to the study of organotin compounds present in polymers are considered.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590010405
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