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  • 1
    ISSN: 1617-4623
    Keywords: Key words Rat ; DNA topoisomerase IIα ; Saccharomyces cerevisiae ; top2ts ; Complementation ; Leucine zipper
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  A series of yeast expression plasmids which comprise segments of the cDNA sequences encoding rat topo IIα have been constructed. The transcription of these constructs is under the control of the yeast GAL1 promoter. Galactose-dependent expression of the cloned rat topo IIα cDNA complemented a yeast top2 ts mutation, as well as a deletion mutation at the yeast TOP2 locus. Truncation of 12 N-terminal amino acids and/or 158 C-terminal amino acids of rat topo IIα had no effect on its ability functionally to substitute for top2 ts . Moreover, a cDNA construct with mutated putative leucine zipper domain (amino acids 993–1013) retained the complementation activity. These observations suggest that transformants capable of conditional topo IIα expression can be exploited as a useful model system for studies on the structure-function relationships of wild-type and mutated topo IIα, as well as the interplay of potential antitumor drugs with the enzyme.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 22 (1991), S. 725-726 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The absolute Raman cross-section was measured for the πu mode of supercritical carbon dioxide at 50 and 75°C over five densities. These measurements clearly show that a dimeric species is responsible for the quadrupole induced dipole (QPID) Raman spectral activity of the πu(ν2) transition in carbon dioxide. This result is in accord with earlier predictions by Amos et al.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 18 (1987), S. 377-379 
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Previous workers, involved in both experimental and theoretical light-scattering studies of liquid and very dense fluid linear triatomic systems, have shown that owing to the presence of the large dipole polarizability anisotropy, molecules such as CO2 or CS2 show much weaker three body spectral cancellation effects when compared with spherical or near spherical scatterers. We now report a very prominent three-body-like spectral cancellation effect on the high-frequency wing of the Raman dipole forbidden ν2 signal from supracritical CO2. We also indicate the correlation of the three-body cancellations with number density and depolarization properties of the systems studied.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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