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  • Organic Chemistry  (4)
  • Candida guiliermondii  (1)
  • Dibutyltin  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Citric acid production ; Candida guiliermondii ; Galactose ; Glucose ; Catabolite repression
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01583714
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The fate of tributyltin toxicants in neoprene-based elastomeric antifouling coatings: 119mSn Mössbauer, 119Sn NMR and chemical studies (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 1 (1987), S. 393-401 
    Details
    ISSN: 0268-2605
    Schlagwort(e): Tributyltin elastomers ; curing process ; chemical changes ; 119mSn Mössbauer spectra ; 119Sn NMR spectra ; carbon black ; neoprene ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The fate of a series of tributyltin toxicants on incorporation into cured neoprene elastomers has been studied by 119mSn Mössbauer and 119Sn NMR spectroscopic techniques, together with supporting chemical derivatization techniques. It is shown that all of the toxicants undergo chemical change during the curing process, being converted into tributyltin chloride, together with (in some cases) tributyltin stearate and a small amount of dibutyltin distearate. Possible interactions between the organotin agents and other components of the elastomer, e.g. carbon black filler, and cure accelerators such as tetramethylthiuram disulphide, have also been investigated.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590010503
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Mössbauer ; Dibutyltin dichloride ; PVC ; Polymers ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590010405
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Organotin stabilizers ; Dibutyltin ; PVC ; Polymers ; Gamma irradiation ; Degradation ; Dealkylation ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: 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.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590010404
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    The degradation of triphenyltin biocides in neoprene-based elastomeric marine antifouling coatings: 119mSn Mössbauer and chemical speciation studies (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 3 (1989), S. 343-347 
    Details
    ISSN: 0268-2605
    Schlagwort(e): Triphenyltin ; neoprene ; elastomer ; Mössbauer ; degradation ; Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The fate of a series of triphenyltin biocides on incorporation into neoprene elastomers has been studied by 119mSn Mössbauer spectroscopy, together with supporting chemical derivatization techniques. It is shown that triphenyltin compounds undergo drastic degradation on incorporation into neoprene, suffering cleavage of phenyl-tin bonds to give a mixture of products in which all stages of dephenylation are present, including stannic chloride. This degradation occurs not only in elastomers cured at 150°C, but also in room temperature solvent-cast samples.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aoc.590030407
    Standort Signatur Erwartet Verfügbarkeit
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