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  • 1975-1979  (4)
  • 1965-1969  (1)
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Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Lysine stimulation of cephalosporin C synthesis in Cephalosporium acremonium (1979)
    Springer
    Applied microbiology and biotechnology 8 (1979), S. 177-182 
    Details
    ISSN: 1432-0614
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Summary Lysine added to a defined medium at a concentration of 1 mg/ml enhances the capacity of Cephalosporium acremonium to produce cephalosporin C. The lysine effect was accompanied by a delayed differentiation to arthrospores followed by more extensive mycelial fragmentation. Higher lysine concentrations reduced the synthesis of cephalosporin C. The effect of lysine on cephalosporin C synthesis was not strain related and was not elicited by the other amino acids tested. Both lysine stimulation and inhibition were evidenct using resting cells. The lysine inhibition of cephalosporin C synthesis with resting cells was relieved by supplementing the medium with 1 to 2 mg/ml α-aminoadipic acid. This reversal supports the hypothesis that lysine restricts the availability of α-aminoadipic acid for β-lactam biosynthesis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00506181
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Enzyme activities associated with arabitol and mannitol biosynthesis and catabolism in Schizophyllum commune (1976)
    Springer
    Archives of microbiology 107 (1976), S. 81-86 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Schizophyllum commune ; Basidiospore germination ; Polyol dehydrogenases ; Polyacrylamide dise gel electrophoresis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Enzymes of polyol metabolism were studied in basidiospore germination of Schizophyllum commune during periods of in vivo arabitol and mannitol pool depletion (growth on glucose-asparagine) and during their subsequent synthesis (growth on acetate-NH 4 + ). Optimal conditions for assays were established and specific activities of enzymes employing d-arabitol, d-mannitol, d-ribulose, d-fructose and d-xylulose as substrates were traced. Inquiries into the products formed during these reactions showed that d-ribulose generated arabitol while d-fructose produced mannitol with d-xylulose giving rise to xylitol. The dehydrogenase reactions were further investigated using polyacrylamide disc gel electrophoresis. Here was revealed the existence of at least two separate enzymatic activities pertaining to the catabolism of arabitol and mannitol. Also noted were the electrophoretic patterns when d-sorbitol, ribitol, xylitol and ethanol were used as substrates.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00427871
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  • 3
    Digitale Medien
    Digitale Medien
    Neutron and proton distribution in nuclei (1968)
    Springer
    The European physical journal 214 (1968), S. 457-463 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We calculate the energy gap for deformed nuclei using the gap equation which appears in the Migdal theory of finite Fermi systems with pair correlations. To obtain good agreement with experiment for nuclei with neutron excess, it is necessary to choose differently the forms of the density dependent residual interaction for the protons and neutrons because of the difference between their density distributions. The distributions we get are in good agreement with experiment as well as with other theoretical predictions. We also show which approximations are required to reduce the general gap equation to the special Migdal equation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01449049
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  • 4
    Digitale Medien
    Digitale Medien
    Calculation of the collective mass-parameter including RPA corrections (1975)
    Springer
    The European physical journal 272 (1975), S. 387-395 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A derivation of the vibrational mass-parameterB is given which makes the consistency with RPA calculations explicit. The expected enhancement by the residual particle-hole and particle-particle interaction is demonstrated by solving the quasiparticle-RPA for deformed nuclei in the rare earth region.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01440866
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  • 5
    Digitale Medien
    Digitale Medien
    Ground state correlations and electron scattering (1976)
    Springer
    The European physical journal 276 (1976), S. 91-97 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The effect of random phase ground state correlations on charge densities and elastic electron scattering cross sections is studied for208Pb and40Ca. Modifications of the charge densities relative to densities obtained by Hartree-Fock calculations with a density dependent force are studied using different RPA wave functions. The differences with respect to the HF charge distributions are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437702
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