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  • 2000-2004  (1)
  • 1995-1999  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Carbon-source-dependent transcriptional control involved in the initiation of cellular differentiation in Streptomyces griseus (2000)
    Springer
    Antonie van Leeuwenhoek 78 (2000), S. 263-268 
    Details
    ISSN: 1572-9699
    Keywords: carbon source ; copper ; morphological differentiation ; Streptomyces ; transcriptional repressor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carbon source is one of the environmental factors that affects cellular differentiation of Streptomyces. We have identified the craA gene as a putative negative regulator involved in the carbon-source-dependent initiation of cellular differentiation in Streptomyces griseus. Carbon-source-dependent transcriptional repression of craA, which is caused by binding of a putative repressor protein to its promoter region, is proposed to result in the initiation of aerial mycelium formation. The presence of a craA homologue in the chromosome of Streptomyces coelicolor A3(2) implicates the existence of a similar regulatory mechanism in this organism. The repression of craA-promoter activity in glucose media could be alleviated not only by replacing glucose with maltose but also by supplying copper, which suggests that the stimulatory effect of copper on cellular differentiation in Streptomyces is excerted via abolishment of glucose-repression of craA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010220614293
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  • 2
    Electronic Resource
    Electronic Resource
    Resistance and Susceptibility Anomalies in IrTe2 and CuIr2Te4 (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 1129-1133 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract IrTe 2 has the CdI 2 structure and CuIr 2 Te 4 has a defect-NiAs structure at room temperature. Both compounds show basically metallic behavior. Magnetic and resistance anomalies, showing a hysteresis in temperature, have been found in IrTe 2 and CuIr 2 Te 4 . On heating, the resistivity ρ exhibits a hump-shaped maximum around 270 and 250 K for IrTe 2 and CuIr 2 Te 4 , respectively. The magnetic susceptibility χ reveals a step-like anomaly which gives evidence of a difference in the value of the Pauli paramagnetism between the high- and low temperature sides, corresponding to the anomalous behavior in ρ. These anomalies of ρ and χ in IrTe 2 originate from a gradual structure deformation with temperature, where the crystal symmetry changes from high temperature trigonal $$P\overline 3 m1$$ to low temperature monoclinic C2/m.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022546928480
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    Paper (German National Licenses)
    Fulltext
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