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  • 1
    Electronic Resource
    Electronic Resource
    Effect of azasqualene on hopanoid biosynthesis and ethanol tolerance of Zymomonas mobilis (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 79 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effect of 2-aza-2,3-dihydrosqualene (azasqualene) on growth and hopanoid content of Zymomonas mobilis was investigated. Concentrations of 4–7 μM azasqualene resulted in a diminishment of growth and hopanoid content of cells with a simultaneous accumulation of squalene. The inhibitory effect of azasqualene was enhanced by ethanol. Furthermore, the importance of hopanoids for the ethanol tolerance of Z. mobilis was demonstrated by an increased growth inhibition of cells with reduced hopanoid content by ethanol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04553.x
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  • 2
    Electronic Resource
    Electronic Resource
    Osmotic adjustment of Zymomonas mobilis to concentrated glucose solutions (1991)
    Springer
    Applied microbiology and biotechnology 34 (1991), S. 518-523 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The physiological basis of the exceptionally high sugar tolerance of Zymomonas mobilis was investigated. Determinations of the internal metabolite concentrations of Z. mobilis showed that an increase in the extracellular glucose concentration was accompanied by a parallel rise in the intracellular glucose concentration, bringing about an almost complete osmotic balance between internal and external space. Studies of glucose transport confirmed that Z. mobilis has a facilitated diffusion system which enables a rapid equilibration between internal and external glucose concentrations. Studies using the non-metabolisable sugars maltose (impermeable) and xylose (permeable) revealed that these sugars were able to alter the osmotic pressure on the cytoplasmic membrane resulting in volume changes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00180581
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electron transport chain of Zymomonas mobilis (1990)
    Springer
    Archives of microbiology 154 (1990), S. 536-543 
    Details
    ISSN: 1432-072X
    Keywords: Zymomonas mobilis ; Glucose dehydrogenase ; Pyrroloquinoline quinone ; Ubiquinone ; Electron transport chain ; TMPD oxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The interaction of the membrane-bound glucose dehydrogenase from the anaerobic but aerotolerant bacterium Zymomonas mobilis with components of the electron transport chain has been studied. Cytoplasmic membranes showed reduction of oxygen to water with the substrates glucose or NADH. The effects of the respiratory chain inhibitors piericidin, capsaicin, rotenone, antimycin, myxothiazol, HQNO, and stigmatellin on the oxygen comsumption rates in the presence of NADH or glucose as substrates indicated that a complete and in the most parts identical respiratory chain is participating in the glucose as well as in the NADH oxidation. Furthermore, the presence of coenzyme Q10 (ubiquinone 10) in Z. mobilis was demonstrated. Extraction from and reincorporation of the quinone into the membranes revealed that ubiquinone is essential for the respiratory activity with glucose and NADH. In addition, a membrane-associated tetramethyl-p-phenylene-diamine-oxidase activity could be detected in Z. mobilis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00248833
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  • 4
    Electronic Resource
    Electronic Resource
    Hemolytic activity of Serratia marcescens (1985)
    Springer
    Archives of microbiology 141 (1985), S. 371-376 
    Details
    ISSN: 1432-072X
    Keywords: Serratia ; Hemolysin ; Human erythrocytes ; Energy dependence ; Erythrocyte membrane proteolysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A cell-bound hemolytic activity was found in several strains of Serratia marcescens. One Serratia cell per ten erythrocytes was sufficient to cause complete lysis of human erythrocytes within 2 h in the liquid assay. The hemolytic activity resided in the membrane fraction and could be inactivated by incubating cells with proteases. The hemolytic activity was greatly enhanced in actively metabolizing Serratia cells and was partially controlled by the iron supply. Hemolysis was accompanied by degradation of erythrocyte membrane proteins (band 3 and 6, glycophorin) and was independent of the blood group. The exoprotease secreted by S. marcescens in large amounts was not involved in hemolysis. Comparison with various hemolytic strains of Escherichia coli showed that hemolysis of erythrocytes was more pronounced with S. marcescens than with E. coli. In contrast to hemolysis by E. coli, lysis of erythrocytes by S. marcescens was not enhanced by Ca2+ ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428852
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    Paper (German National Licenses)
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