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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and X-ray structures of some mono- and binuclear ruthenium complexes with bisphosphine ligands (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 533-540 
    Details
    ISSN: 1434-4475
    Keywords: Ruthenium ; Binuclear complexes ; X-Ray analysis ; Oxidation ; Bisphosphines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Komplexe {RuCp*(μ-Cl)}2(μ-dppm) (1) und {RuCp*(μ-Cl2(μ-dppe) (3) wurden durch Umsetzung von [RuCp*(μ3-Cl)]4 mitdppm bzw.dppe dargestellt.1 wird durch AgCF3SO3 zum zweikernigen Komplex [{RuCp*(μ-Cl)}2(μ-dppm)](SO3CF3)2 (2) oxidiert, welcher eine Ru-Ru-Metallbindung aufweist. Unter den gleiche Reaktionsbedingungen zersetzt sich3 zu undefinierten Produkten. Analog zu1 reagiert RuCp* (dmpe)Cl mit AgCF3SO3 zum Ru(III)-Komplex [Ru(Cp*)(dmpe)Cl](SO3CF3) (4) wobei es zu keiner Chloridabspaltung kommt. Von2,3, und4 wurden die Kristallstrukturen bestimmt.
    Notes: Summary The dinuclear complexes {RuCp*(μ-Cl)}2(μ-dppm) (1) and {RuCp*(μ-Cl)}2 (μ-dppe) (3) are obtained by reacting [RuCp*(μ3-Cl)]4 withdppm, anddppe, respectively.1 is readily oxidized with AgCF3SO3, instead of chloride abstraction, to afford the dinuclear complex [{RuCp*(μ-Cl)}2(μ-dppm)](SO3CF3)2 (2) with two metal centers connected by a single Ru-Ru bond. Under the same conditions,3 decomposes to several intractable materials. Similarly to1, RuCp* (dmpe)Cl reacts with AgCF3SO3 to afford the Ru(III) complex [RuCp*(dmpe)Cl](SO3CF3) (4) without no halide abstraction. The crystal structures of2,3, and4 are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807583
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  • 2
    Electronic Resource
    Electronic Resource
    Regulation of σ B-dependent transcription of sigB and asp23 in two different Staphylococcus aureus strains (1999)
    Springer
    Molecular genetics and genomics 261 (1999), S. 558-566 
    Details
    ISSN: 1617-4623
    Keywords: Key wordssigB ; asp23 ; rsbU ; Staphylococcus aureus ; Bacillus subtilis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The alkaline shock protein Asp23 was identified as a σ B-dependent protein in Staphylococcus aureus. In Bacillus subtilis, the asp23 promoter from S. aureus is regulated like other σ B-dependent promoters, which are strongly induced by heat and ethanol stress. However, almost no induction of asp23 expression was found after heat or ethanol stress in S. aureus MA13 grown in a synthetic medium, where the basal expression level of asp23 is high. Under the same experimental conditions the σ B gene itself showed a similar expression pattern: it was highly expressed in synthetic medium but not induced by heat or ethanol stress. In contrast, σ B activity was increased by heat stress when the cells were grown in a complex medium. The constitutive expression of sigB and σ B-dependent stress genes in S. aureus MA13 grown in a synthetic medium is in a sharp contrast to the regulation of σ B activity in B. subtilis, and needs further investigation. A deletion of 11 bp in the rsbU gene, which encodes the phosphatase that acts on RsbV (the anti-anti-sigma factor), in S. aureus NCTC 8325-4 might be responsible for the failure of heat stress to activate σ B in complex medium, and thus reduce the initiation of transcription at σ B-dependent promoters in this strain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380051001
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    Paper (German National Licenses)
    Fulltext
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