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  • 1
    Electronic Resource
    Electronic Resource
    The Impact of Fe and Cu Contamination in the 10〈sup〉12〈/sup〉 at/cm〈sup〉2〈/sup〉 Range on the Performance of Junction Diodes (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 47-48 (July 1995), p. 397-402 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/25/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.47-48.397.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    d-Glucose does not catabolite repress a transketolase-deficientd-ribose-producingBacillus subtilis mutant strain (1996)
    Springer
    Journal of industrial microbiology and biotechnology 17 (1996), S. 104-109 
    Details
    ISSN: 1476-5535
    Keywords: d-ribose ; Bacillus subtilis ; transketolase ; catabolite repression ; pentose phosphate cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract WhenBacillus subtilis strain ATCC 21951, a transketolase-deficientd-ribose-producing mutant, was grown ond-glucose plus a second substrate which is metabolized via the oxidative pentose phosphate cycle (d-gluconic acid,d-xylose,l-arabinose ord-xylitol),d-glucose did not catabolite repress metabolism of the second carbon source. Thed-ribose yield obtained with the simultaneously converted carbon substrates, significantly exceeded that when onlyd-glucose was used. In addition, the concentration of glycolytic by-products and the fermentation time significantly decreased. Based on these findings, a fermentation process was developed withB. subtilis strain ATCC 21951 in whichd-glucose (100 g L−1) andd-gluconic acid (50 g L−1) were converted into 45 g L−1 ofd-ribose and 7.5 g L−1 of acetoin. A second process, based ond-glucose andd-xylose (100 g L−1 each), yielded 60 g L−1 ofd-ribose and 4 g L−1 of acetoin plus 2,3-butanediol. Both mixed carbon source fermentations provide excellent alternatives to the less efficientd-glucose-based processes used so far.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01570052
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  • 3
    Electronic Resource
    Electronic Resource
    Biodegradation of microbial lipopolysaccharides (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 730-731 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé La biodégradation parBacillus macerans des lipopolysaccharides (LPS), extraites deSalmonella typhimurium, Salmonella minnesota et Escherichia coli fut étudiée dans un milieu liquide minéral, contenant uniquement ces LPS comme sources de carbone. II fut observé qu'après avoir effectué une hydrolyse des LPS le microorganisme se développe sur les acides gras, libérés de la fraction lipidique. Après 17 jours de croissance la fraction polysaccharide était encore intact. Le même phénomène de biodégradation fut observé avec une souche typiquement lipolytique (Micrococcus sp.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01944803
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  • 4
    Electronic Resource
    Electronic Resource
    Properties of the purified penicillin V-acylase ofErwinia aroideae (1975)
    Springer
    Cellular and molecular life sciences 31 (1975), S. 140-143 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Une pénicilline V-acylase intracellulaire, produite par une soucheErwinia aroideae a été purifiée et caractérisée. Cette enzyme présente des propriétés différentes des penicilline-acylases classiques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01990668
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  • 5
    Electronic Resource
    Electronic Resource
    Production of d-ribose by fermentation (1997)
    Springer
    Applied microbiology and biotechnology 48 (1997), S. 141-148 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The production of d-ribose by fermentation has received much attention lately, possibly because of the use of this pentose to synthesize antiviral and anticancer drugs. This review briefly outlines the methods that have been used to synthesize d-ribose since it was identified in yeast RNA, and focuses in particular on the latest developments in d-ribose fermentation, which have led to d-ribose yields that exceed 90 g/l. Furthermore, the various transketolase-deficient d-ribose-producing mutants that are used, and the biochemical and genetic rationales applied to select them or to enhance their d-ribose productivities, are dealt with. Attention is also drawn to the unusual pleiotropic characteristics of the mutant strains, as well as to the industrial and academic applications of d-ribose.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051029
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  • 6
    Electronic Resource
    Electronic Resource
    The sucrose phosphorylase of Leuconostoc mesenteroides: production and application (1982)
    Springer
    Antonie van Leeuwenhoek 48 (1982), S. 516-519 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00448443
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  • 7
    Electronic Resource
    Electronic Resource
    A Computer-aided noninterfering on-line technique for monitoring oxygen-transfer characteristics during fermentation processes (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 24 (1982), S. 1605-1621 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The role of computers in the monitoring and control of fermentation processes has increased steadfastly. The ultimate utility of the machines will not depend on the availability of online sensors but also on the availability of techniques that combine direct measurements, leading towards estimates of variable closely related to the microbial process or its control. In this article, a methodology for on-line and noninterfering evaluation of the volumetric mass-transfer coefficient Kla is developed. A detailed presentation of the procedure, called “the static method,” is given. Its feasibility is proved through implementation of the method on an antibiotic fermentation process. These experiments indicate that operator actions meant to modify the oxygen-transfer conditions can be checked on-line. The quantitative value of the static method is ascertained by comparing the experimental results with Kla estimates obtained with the “gassing-out” method. A sensitivity analysis was carried out, revealing the need for temperature and pressure corrections and showing that the precision of the oxygen analyzer determines the precision of the static method.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260240713
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  • 8
    Electronic Resource
    Electronic Resource
    Dynamics and regulation of sucrose phosphorylase formation in Leuconostoc mesenteroides fermentations (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 29 (1987), S. 8-15 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The production of Leuconostoc mesenteroides sucrose phosphorylase has been studied in 10- and 20-L batch fermentations. A fermentation medium was devised combining rapid growth, high cell yield, and high enzyme levels. Overall fermentation dynamics and enzyme fermentation patterns are elucidated here in detail. Sucrose is phosphorolyzed into fructose and glucose-1-phosphate (G-1-P) with G-1-P preferentially utilized (thus saving ATP). Subsequently, fructose is gradually metabolized and is also converted to mannitol. Invertase activity is absent. Sucrose phosphorylase is formed transitorily with peak levels toward the end of active growth; a sharp decline in enzyme activity occurs upon further fermentation. The moment of cell (enzyme) harvest is thus critical in view of obtaining active cell or enzyme preparations for sucrose phosphorolysis. Microaerophilic and strictly anaerobic fermentations displayed no appreciable difference in sucrose phosphorylase formation profile. The enzyme is intracellularly located. It is constitutively formed in the absence of sucrose, contrary to that of Pseudomonas species; other disaccharide phosphorylases are not formed.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260290103
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on the bacteriophage MS 2 (1972)
    Springer
    Molecular genetics and genomics 117 (1972), S. 219-228 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The viral proteins synthesized in non-suppressor cells by amber mutants in the A protein cistron of the RNA bacteriophage MS2 were analyzed. Protein synthesis was studied in rifampicin-inhibited cultures and the labeled, viral proteins were separated on sodium dodecyl sulphate containing polyacrylamide gels. We found that 7 out of 19 mutants synthesized an A protein-fragment corresponding in length to 88% of the wild-type A protein. This fragment was not incorporated into the defective particles formed by the mutants. 12 mutants synthesized no detectable amount of fragment. It was shown that the absence of fragment is not due to selective proteolytic breakdown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271649
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  • 10
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    Unknown
    Biodegradation of microbial lipopolysaccharides (1973)
    Springer
    Details
    Publication Date: 1973-06-01
    Print ISSN: 0014-4754
    Topics: Biology , Medicine
    Published by Springer
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