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  • 1
    Electronic Resource
    Electronic Resource
    Absence of cyanide-insensitive respiration in Schizosaccharomyces japonicus (1982)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 15 (1982), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1982.tb00056.x
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  • 2
    Electronic Resource
    Electronic Resource
    The cyanide sensitivity of the residual respiration in Schizosaccharomyces japonicus (1984)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 21 (1984), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Schizosaccharomyces japonicus, a highly respiratory deficient yeast species, contains two terminal oxidase systems. One is highly sensitive to cyanide like the main terminal oxidase system of respiratory sufficient yeasts. The alternative system is hardly sensitive to cyanide like the usual terminal oxidase system of other respiratory deficient yeasts, and such as that found in respiratory sufficient yeasts besides the sensitive system. The order of magnitude of each system in Sch. japonicus is only a few μl O2· (mg dry biomass)−1· h−1, the insensitive system having the lowest activity. As a result the alternative system may pass unnoticed. This situation may be unique among yeasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1984.tb00183.x
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of optically pure 1,2-epoxypropane by microbial asymmetric reduction of chloroacetone (1992)
    Springer
    Applied microbiology and biotechnology 38 (1992), S. 297-300 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A number of bacteria and yeast was screened for asymmetric reduction of prochiral chloroacetone into chiral 1-chloro-2-propanol, which is chemically convertible into chiral 1,2-epoxypropane. In this way Rhodotorula glutinis produced optically pure S-1,2-epoxypropane with 98% enantiomeric excess and in a relatively high final concentration. The enzyme that catalysed the asymmetric reduction was an NAD(P)H-dependent alcohol dehydrogenase. Reduction of racemic 3-chloro-2-butanone resulted in mixtures of cis and trans-2,3-epoxybutane, indicating that no enantioselective reduction of this haloketone occurred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170075
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  • 4
    Electronic Resource
    Electronic Resource
    Chiral resolution of 2,3-epoxyalkanes by Xanthobacter Py2 (1988)
    Springer
    Applied microbiology and biotechnology 27 (1988), S. 337-340 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary With propene-grown cells of Xanthobacter Py2 it was possible to resolve racemic mixtures of 2,3-epoxyalkanes. Only 2S-forms were metabolized by this organism, resulting in pure 2R-2,3-epoxyalkanes. Chiral resolution was obtained with trans-2,3-epoxybutane, trans-2,3-epoxypentane and cis-2,3-epoxypentane. Xanthobacter Py2 was however not able to discriminate between the enantiomeric forms of 1,2-epoxyalkanes, resulting in the complete degradation of both chiral forms of 1,2-epoxyalkanes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00251764
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  • 5
    Electronic Resource
    Electronic Resource
    Dithiol- and NAD-dependent degradation of epoxyalkanes by Xanthobacter Py2 (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 775-781 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract  A broad range of epoxyalkanes was converted into the corresponding ketones by cell extracts of Xanthobacter Py2. Both 1,2- and 2,3-epoxyalkanes were degraded and in addition, the degradation of 2,3-epoxyalkanes in all cases was highly enantioselective. Conversion of a deuterium-labelled substrate indicated that the ketone product was probably formed indirectly via an hydroxy intermediate. Degradation of epoxyalkanes by Xanthobacter Py2 was dependent on both NAD and another, not yet identified, cofactor that was present in the low-molecular-mass fraction (LMF) of propene-grown cells. It is proposed that the LMF was involved in a reductive reaction step since it could be replaced by dithiothreitol (DTT) and various other dithiol compounds. Epoxyalkane-degrading activity was inhibited by the sulphhydryl blocking reagent N-ethylmaleimide (NEM). Inhibition by NEM and stimulation by LMF, DTT and other dithiols was effective only in the simultaneous presence of NAD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050330
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  • 6
    Electronic Resource
    Electronic Resource
    Dithiol- and NAD-dependent degradation of epoxyalkanes by Xanthobacter Py2 (1995)
    Springer
    Applied microbiology and biotechnology 42 (1995), S. 775-781 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A broad range of epoxyalkanes was converted into the corresponding ketones by cell extracts of Xanthobacter Py2. Both 1,2- and 2,3-epoxyalkanes were degraded and in addition, the degradation of 2,3-epoxyalkanes in all cases was highly enantioselective. Conversion of a deuterium-labelled substrate indicated that the ketone product was probably formed indirectly via an hydroxy intermediate. Degradation of epoxyalkanes by Xanthobacter Py2 was dependent on both NAD and another, not yet identified, cofactor that was present in the low-molecular-mass fraction (LMF) of propene-grown cells. It is proposed that the LMF was involved in a reductive reaction step since it could be replaced by dithiothreitol (DTT) and various other dithiol compounds. Epoxyalkane-degrading activity was inhibited by the sulphhydryl blocking reagent N-ethylmaleimide (NEM). Inhibition by NEM and stimulation by LMF, DTT and other dithiols was effective only in the simultaneous presence of NAD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171961
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  • 7
    Electronic Resource
    Electronic Resource
    Continuous production of enantiopure 1,2-epoxyhexane by yeast epoxide hydrolase in a two-phase membrane bioreactor (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 641-646 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A two-phase membrane bioreactor was developed to continuously produce enantiopure epoxides using the epoxide hydrolase activity of Rhodotorula glutinis. An aqueous/organic cascade, hydrophilic, hollow-fiber membrane bioreactor was used: (1) to carry out large-scale resolution of epoxides, (2) to continuously extract residual enantiopure epoxides from the aqueous phase, and (3) to separate inhibitory formed diol from the yeast cells contained in the aqueous phase. Dodecane was employed to dissolve-feed epoxide as well as to extract residual epoxide. 1,2-Epoxyhexane was used as a model substrate. By use of this membrane bioreactor, enantiopure (S)-1,2-epoxyhexane (〉98% enantiomeric excess) was obtained with a volumetric productivity of 3.8 g l−1 h−1. The continuous-production system was operated for 12 days and resulted in 38 g enantiopure (S)-1,2-epoxyhexane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000451
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  • 8
    Electronic Resource
    Electronic Resource
    Resolution of 1,2-epoxyhexane by Rhodotorula glutinis using a two-phase membrane bioreactor (1999)
    Springer
    Applied microbiology and biotechnology 53 (1999), S. 7-11 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Large-scale resolution of epoxides by the yeast Rhodotorula glutinis was demonstrated in an aqueous/organic two-phase cascade membrane bioreactor. Due to the chemical instability and low solubility of epoxides in aqueous phases, an organic solvent was introduced into the reaction mixture in order to enhance the resolution of epoxide. A cascade hollow-fiber membrane bioreactor was used (1) to minimize the toxicity of organic solvents towards the epoxide hydrolase of R. glutinis, and (2) to remove inhibitory amounts of formed diol from the yeast cell containing aqueous phase. Dodecane was selected as a suitable solvent and 1,2-epoxyhexane as a model substrate. By use of this membrane bioreactor, highly concentrated (0.9 M in dodecane) enantiopure (〉 98% ee) (S)-1,2-epoxyhexane (6.5 g, 30% yield) was obtained from the racemic mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051606
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  • 9
    Electronic Resource
    Electronic Resource
    Oxidation of amines by yeasts grown on 1-aminoalkanes or putrescine as the sole source of carbon, nitrogen and energy (1986)
    Springer
    Antonie van Leeuwenhoek 52 (1986), S. 525-535 
    Details
    ISSN: 1572-9699
    Keywords: 1-aminoalkanes ; alkylamines ; ethylamine ; butylamine ; putrescine ; amine oxidase ; Trichosporon cutaneum ; Trichosporon adeninovorans ; Candida famata ; Stephanoascus ciferrii ; Cryptococcus laurentii
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The maximum growth rate of Trichosporon cutaneum CBS 8111 in chemostat cultures was 0.185 h-1 on ethylamine and 0.21 h-1 on butylamine, that of Candida famata CBS 8109 was 0.32 h-1 on putrescine. The amine oxidation pattern of the ascomycetous strains studied, viz. Candida famata CBS 8109, Stephanoascus ciferrii CBS 4856 and Trichosporon adeninovorans CBS 8244 was independent of the amine that had been used as the growth substrate. It resembled that of benzylamine/putrescine oxidase found in other ascomycetous yeasts. However, differences in pH optimum and substrate specificity were observed between the amine-oxidizing systems of these three species. The amine oxidation pattern of cell-free extracts of Trichosporon cutaneum CBS 8111 varied with the amine that was used as growth substrate. The enzyme system produced by Cryptococcus laurentii CBS 7140 failed to oxidize isobutylamine and benzylamine, and showed a high pH optimum. The synthesis of amine oxidase in the four yeast strains studied was not repressed by ammonium chloride and was weakly repressed by glucose but was strongly repressed if both compounds were present in the growth medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423413
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  • 10
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    Resolution of 1,2-epoxyhexane by Rhodotorula glutinis using a two-phase membrane bioreactor (1999)
    Springer
    Details
    Publication Date: 1999-12-12
    Print ISSN: 0175-7598
    Electronic ISSN: 1432-0614
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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