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Träfflista för sökning "WFRF:(Bernhard J) srt2:(2000-2004)"

Sökning: WFRF:(Bernhard J) > (2000-2004)

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1.
  • Ambroladze, Amiran, et al. (författare)
  • When is small beautiful?
  • 2003
  • Ingår i: Lecture Notes in Computer Science (Learning Theory and Kernel Machines). - : Springer. - 1611-3349 .- 0302-9743. - 9783540407201 ; 2777, s. 729-730
  • Konferensbidrag (refereegranskat)abstract
    • The basic bound on the generalisation error of a PAC learner makes the assumption that a consistent hypothesis exists. This makes it appropriate to apply the method only in the case where we have a guarantee that a consistent hypothesis can be found, something that is rarely possible in real applications. The same problem arises if we decide not to use a hypothesis unless its error is below a prespecified number.
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3.
  • Mangold, Monika, et al. (författare)
  • Synthesis of group A streptococcal virulence factors is controlled by a regulatory RNA molecule.
  • 2004
  • Ingår i: Molecular Microbiology. - 0950-382X .- 1365-2958. ; 53:5, s. 1515-1527
  • Tidskriftsartikel (refereegranskat)abstract
    • The capacity of pathogens to cause disease depends strictly on the regulated expression of their virulence factors. In this study, we demonstrate that the untranslated mRNA of the recently described streptococcal pleiotropic effect locus (pel), which incidentally contains sagA, the structural gene for streptolysin S, is an effector of virulence factor expression in group A beta-haemolytic streptococci (GAS). Our data suggest that the regulation by pel RNA occurs at both transcriptional (e.g. emm, sic, nga) and post-transcriptional (e.g. SpeB) levels. We could exclude the possibility that the pel phenotype was linked to a polar effect on downstream genes (sagB-I). Remarkably, the RNA effector is regulated in a growth phase-dependent fashion and we provide evidence that pel RNA expression is induced by conditioned media.
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4.
  • Stäring, J., et al. (författare)
  • Fluctuations of the Shannon capacity in a Rayleigh model of wireless communication
  • 2004
  • Ingår i: Physica Status Solidi (B): Basic Research. - 1521-3951 .- 0370-1972. ; 241:9, s. 2136-2138
  • Tidskriftsartikel (refereegranskat)abstract
    • We consider a Rayleigh model[Foschini and Gans, Wirel. Pers. Commun. 6, 311 (1998)] for the Shannon capacity characterising wireless information transfer in a network of antennae. In this model, the capacity C is a linear statistic of the channel matrix of the network. We use this fact to calculate the variance var[C] of the Shannon capacity. We find that the expected value 〈C〉 of the Shannon capacity is typical, that is the coefficient of variation √var[C]/〈C〉 is small.
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5.
  • Walther, Bernhard, et al. (författare)
  • Flow processing and gel formation : A promising combination for the design of the shape of gelatin drops
  • 2002
  • Ingår i: Food Hydrocolloids. - 0268-005X .- 1873-7137. ; 16:6, s. 633-643
  • Tidskriftsartikel (refereegranskat)abstract
    • This investigation is a model study on how drops can be structured by a combination of flow processing and gel formation. Different drop shapes were created by subjecting gelatin drops to various flow conditions. At the same time, temperature induced gel formation of the drops fixed the shape. Elongated drops and drops of complex form were created. The flow to shape the gelatin drops was generated in a 4-Roll Mill (4RM) and silicon oil was used as the continuous phase. During processing in the 4RM, the drops were allowed to follow two different streamlines and thereby being subjected to purely elongational and a mixture of shear and elongational flow. The drop size varied between 1.5 and 2.8 mm. The gelatin drops were temperature conditioned before the experiment to 60 °C and the silicon oil to 5 °C. The drops were cooled via the cold oil phase during the flow process, and gel formation was induced. A gel strength strong enough to resist further deformation was achieved at different fixation zones in the 4RM, and this depended on the process parameters of flow type, flow rate, drop size and gelatin concentration. The shape created was directly related to the fixation zone. There was a broad freedom to combine different parameter values to fix a drop in a certain fixation zone. The mechanism behind the various drop shapes is explained in terms of elongation, relaxation, pinching and gel formation in relation to flow pattern and time in the 4RM. Elongation is a major contribution to the mechanism in the case of elongated shapes, while elongation followed by relaxation and pinching are the dominant determinants in the creation of complex shapes. © 2002 Elsevier Science Ltd. All rights reserved.
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