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  • 1
    Electronic Resource
    Electronic Resource
    Quasiparticle tunneling in HTS grain boundary Josephson junctions (1997)
    Springer
    Journal of low temperature physics 106 (1997), S. 243-248 
    Details
    ISSN: 1573-7357
    Keywords: 85.25. Cp ; 74.50.+r ; 85.70.-w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The quasiparticle tunneling (QPT) in YBa2Cu3O7−δ (YBCO), Bi2Sr2CaCu2O8+x (BSCCO), Nd1.85Ce0.15CuOx (NCCO) and La1.85Sr0.15CuO4−δ (LSCO) grain boundary Josephson junctions (GBJs) has been studied. At voltages above the gap voltage V9, the measured conductance vs. voltage, G(V), curves show a temperature independent parabolic shape allowing the determination of the effective height and thickness of the insulating grain boundary barrier. At |V|〈Vg, the G(V)-curves are well fitted by a BCS density of states and temperature dependence of the energy gap, if a large broadening parameter Γ is assumed for the gap. The large Γ value most likely is related to the high density of localized states within the grain boundary barrier. Furthermore, a zero-bias conductance anomaly is observed which can be analyzed in terms of spin-flip and Kondo-type scattering at the interface (Anderson-Appelbaum model).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399621
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  • 2
    Electronic Resource
    Electronic Resource
    Representational difference analysis identifies a strain-specific LPS biosynthesis locus in Bordetella spp. (1999)
    Springer
    Molecular genetics and genomics 262 (1999), S. 189-198 
    Details
    ISSN: 1617-4623
    Keywords: Key wordsBordetella spp. ; Evolution ; Lipopolysaccharide biosynthesis ; Pulsed-field gel electrophoresis ; Representational difference analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bordetella pertussis and B. bronchiseptica are genetically very closely related but differ significantly in their virulence properties. Using Representational Difference Analysis (RDA), 11 DNA fragments specific for B. pertussis Tohama I or B. bronchiseptica BB7865 were identified. All B. bronchiseptica BB7865-derived fragments also hybridized with chromosomal DNA from B. parapertussis but not from the B. pertussis strains Tohama I and W28, underlining the close phylogenetic relationship between B. bronchiseptica and B. parapertussis. The B. pertussis type strain BP18323 is a special case, as it contains DNA sequences characteristic for both B. pertussis and B. bronchiseptica. As demonstrated by pulsed-field gel electrophoresis, several of the BB7865-derived fragments are present on a single 30-kb XbaI fragment. Based on the sequences of putative coding regions, four of these fragments may code for proteins involved in carbohydrate metabolism or transport. In agreement with this notion, a mutant for one of these loci synthesizes a significantly altered lipopolysaccharide that lacks the O-specific side chains. The analysis of the corresponding genomic region in various Bordetella species showed that this locus is present in B. bronchiseptica and B. parapertussis but not in B. pertussis. This confirms that the RDA approach has identified a novel strain-specific LPS biosynthesis locus which accounts for the differences between the LPS structures elaborated by different Bordetella species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380051074
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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