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  • 3-Halocamphors  (1)
  • Dihydrofolate  (1)
  • 1990-1994  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Nonsense suppression in thymine-requiring strains of Escherichia coli is a consequence of altered folate metabolism (1993)
    Springer
    Molecular genetics and genomics 238 (1993), S. 218-224 
    Details
    ISSN: 1617-4623
    Keywords: Thy−phenotype ; Suppression ; Folate levels ; Dihydrofolate ; Translational accuracy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thymine-requiring strains of Escherichia coli suppress nonsense and frameshift mutants of T4 phage. We proposed that these mutants make errors during translation because of an imbalance in folate metabolism. A thymine-requiring strain grown under suppressing conditions has elevated levels of reduced folates. We tested the effect of either mutational blocks or the inhibition of various steps in folate biosynthesis on suppression. Conditions which prevent the accumulation of 5-methyl tetrahydrofolate inhibit suppression, suggesting that elevated levels of this folate are required for suppression. Furthermore, conditions that result in an accumulation in dihydrofolate inhibit suppression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279550
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  • 2
    Electronic Resource
    Electronic Resource
    Proton resonance spectra and substituent-induced chemical shifts of 3-halocamphors (1994)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 32 (1994), S. 503-508 
    Details
    ISSN: 0749-1581
    Keywords: 1H NMR ; 3-Halocamphors ; COSY-45 ; Molecular geometries ; Substituent-induced chemical shifts ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complete signal assignments of high-field 1H NMR spectra for 3-halosubstituted camphors (endo and exo) are presented, allowing a refinement of a previous analysis for the chloro (endo and exo) and bromo (endo) derivatives. In addition, still unpublished data for the dichloro and exo-fluoro derivatives and for three new compounds (endo-fluoro, endo- and exo-iodo), in addition to a revised assignment of the camphor parent molecule, are reported. The precise substituent-induced chemical shifts (SCS) obtained for these difunctional systems are examined on the basis of well known transmission mechanisms aided by correlations with steric and electronic parameters, and taking into account SCS data from monohaloalkanes and the calculated molecular geometry data (using the AM1 method).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260320902
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