ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1432-072X
    Keywords: Phenol ; 4-Chlorophenol ; p-Cresol ; Fatty acids ; Lipids ; Supplementation ; Tolerance ; Membrane ; E. coli
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the presence of sublethal concentrations of phenol, 4-chlorophenol, and p-cresol in the growth medium, cells of Escherichia coli modified the fatty acid composition of their lipids. The result of these changes was an increase in the degree of saturation of lipids probably in order to compensate an increase of fluidity of the membrane induced by the phenols. Supplementation of the growth medium with saturated fatty acids could also enhance the degree of lipid saturation due to the incorporation of the acyl chains in the phospholipids. At the same time the growth of cells was less inhibited than in unsupplemented cells. The increase of tolerance of cells by manipulating the lipid composition indicates that the membrane structure plays a crucial role in the mode of action of phenols.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 86 (1972), S. 231-240 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung 1. Beim Abbau von Decanol durch Pseudomonas aeruginosa wird die Bakterienatmung durch verschiedene Carbonylreagentien unterschiedlich gehemmt. Dabei verursachen schon geringe Semicarbazid-Mengen, die die Atmung der Bakterien noch nicht beeinflussen, eine Wachstumshemmung des Pseudomonas-Stammes im Fermenter. 2. Decanol läßt sich als Semicarbazon im Fermentationsmedium anreichern und nach Hydrolyse direkt gaschromatographisch bestimmen. Eine optimale Ausbeute an Aldehyd wird schon nach kurzer Fermentationsdauer erreicht (2 h), jedoch nimmt die Menge des angereicherten Semicarbazons bei längeren Fermentationszeiten wieder ab. 3. Der Stoffwechsel der Bakterien während des Decanolabbaues wird durch Zusatz von Semicarbazid zwar gehemmt, aber nicht blockiert. Bis zum Ende der Fermentation verläuft der Alkoholabbau weiter über die terminale Oxidation.
    Notes: Summary 1. During the oxidation of decanol by Pseudomonas aeruginosa several carbonyl reagents inhibit the bacterial respiration in different ways. Low concentrations of semicarbazide, which do not yet influence bacterial respiration, inhibit growth of the Pseudomonas strain in “batch”-fermentation. 2. Decanal is accumulated as semicarbazone in the fermentation liquid and is determined by gaschromatography after hydrolysis. Optimal production of aldehyde is obtained after a fermentation time of 2 h; the quantity of accumulated semicarbazone, however, decreases during a longer fermentation time. 3. The bacterial metabolism during decanol oxidation is inhibited but not stopped by semicarbazide. Until the end of the fermentation process, alcohol degradation proceeds by terminal oxidation.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Beim Abbau von Tetradecanol durch Pseudomonas aeruginosa wird Tetradecanal als Semicarbazon angereichert und als 2,4-Dinitrophenylhydrazon nachgewiesen. Die Gewinnung eines Aldehyds wird durch Anreicherung aus einer wachsenden Kultur möglich.
    Notes: Summary In the oxidation of tetradecanol by Pseudomonas aeruginosa tetradecanal was accumulated as semicarbazon and was identified as 2,4-Dinitrophenylhydrazon. This confirms the possibility of production of an intermediate aldehyde out of the growing culture.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 50 (1963), S. 456-456 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 51 (1964), S. 13-14 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 46 (1959), S. 431-432 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Applied microbiology and biotechnology 26 (1987), S. 338-341 
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The semicontinuous production of chlortetracycline by immobilized cells of Streptomyces aureofaciens ATCC 10762 was compared with that of free cells. Immobilized cells transferred repeatedly to a new production medium, showed a fourfold increase in the half life time of antibiotic production. In an air bubble column a high chlortetracycline productivity was obtained with a high aeration rate. A semicontinuous production of chlortetracycline by immobilized S. aureofaciens could be improved by varying the fermentation conditions. For continuous chlortetracycline production by immobilized cells, no improvement was detected.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Physiological properties have been determined for calcium-alginate-entrapped Saccharomyces cerevisiae in comparison to cells in suspension under identical culture conditions. Cells grown in the form of microcolonies in the alginate beads showed faster glucose uptake and ethanol productivity with simultaneously decreased product and cell yields. Increased specific hexokinase and phosphofructokinase activities could be determined in these cells. Immobilized single cells showed only slightly enhanced glucose turnover and no higher specific hexokinase activity. The significant alterations in physiology are apparently connected with growth of the cells in aggregates.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Applied microbiology and biotechnology 33 (1990), S. 196-201 
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary The influence of inorganic phosphate and immobilization on cells of Claviceps purpurea strain 1029/N5 producing ergot peptides in shake culture was examined. Immobilization in Ca-alginate beads resulted in a marked reduction of some metabolic activities, i.e. the periods of alkaloid formation and cell growth were prolonged. High concentrations of inorganic phosphate (1 g/l KH2PO4) could reduce or stop alkaloid formation both by free and immobilized cells at any time during fermentation. The optimum phosphate concentration for alkaloid production by immobilized cells (about 0.5 mM) was a quarter of that required by free cells. This optimum shift was attributed to (i) the diminished phosphate demand of immobilized cells, due to their reduced metabolic activities, and (ii) the phosphate-dependent morphological behaviour of the biocatalyst. The observed decrease in alkaloid concentrations during later periods of the fermentation supported the idea of alkaloid-degradative enzymes, activated by high phosphate concentrations. Immobilization showed an advantageous influence on this undesirable effect.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Applied microbiology and biotechnology 35 (1991), S. 662-668 
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Alcaligenes sp. A 7-2 immobilized on granular clay has been applied in a percolator to degrade 4-chlorophenol in sandy soil. Good adsorption rates on granular clay were achieved using cell suspensions with high titres and media at pH 8.0. The influence of various parameters such as aeration rate, pH, temperature, concentration of 4-chlorophenol and size of inoculum on the degradation rate were investigated. During fedbatch fermentations under optimal culture conditions, concentrations of 4-chlorophenol up to 160 mg·1−1 could be degraded. Semicontinuous culture experiments demonstrated that the degradation potential in soil could be well established and enhanced by the addition of immobilized bacteria. Continuous fermentation was performed with varying 4-chlorophenol concentrations in the feed and different input levels. The maximum degradation rate was 1.64 g·1−1·day−1.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...